A Novel 5 Step Septum Feed Suite
|
|
- Charleen Reeves
- 5 years ago
- Views:
Transcription
1 A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 SM6FHZ and SM6PGP Updated Post Conference Edition
2 Outline Prerequisite Features Design criteria / considerations Wave Guides Septum Kumar choke, size, position etc Probes Performance overview 23 cm 0.71 L W/G feed performance Mechanical dimensions (for each feed) Detailed information (for each feed) 23 cm L W/G feed performance 9 cm L W/G feed performance 6 cm L W/G feed performance 3 cm L W/G feed performance 3 cm L W/G feed performance Realization On the air experience Lessons Learned Conclusions Swedish EME-meeting May
3 Prerequisite I was in need for a new 23 cm feed to retrofit my 30 year old, ill built and corroded W2IMU feed. Then a need for feeds for the higher bands arose. What to do about that? Several existing 23 cm designs were available. I felt the performance had a potential to be improved with proper optimization using contemporary EM-simulation S/W Focus was put on f/d 0.32 to 0.42 (my 5.5 m dish is 0.37 f/d) N2UO adaptation of the W2IMU Dual Mode feed satisfies the need in the area of f/d s from ~0.42 to ~0.55 The existing feeds for higher bands are mostly scaled versions of 23 cm feeds. I saw a opening for feeds specifically designed and optimized for the specific band to get the best possible performance I have learnt a lot about septums, chokes and wave guides along the way and have had a lot of fun and been frustrated as well at times Swedish EME-meeting May
4 Features Two 23 cm 5 step septum feeds for different f/d ranges 9, 6 and 3 cm feeds from standard metric plumbing copper or brass tubes Unprecedented top notch performance Focus on easy manufacturing and low tolerance sensitivity Suitable for f/d s ranging from 0.32 to 0.42 plus ~0.5 f/d for the 3 cm Dual Mode Feed The three 3 cm feeds cover both and MHz All comprising a Kumar choke or Dual Mode structure depending on the f/d the feed is aiming for Swedish EME-meeting May
5 Design criteria We strive for Optimum amplitude feed pattern Flat phase response across the full dish surface (small phase errors) Low axial ratio across the full dish surface (low cross polarization) We can not get all of this optimized at the same time, so we have to look for the best compromise. The W1GHZ feed efficiency evaluation S/W Phase_CP has been used for this evaluation. This means that these results can be compared to the results of other feeds evaluated using the same S/W. Phase_CP is the latest version of Pauls evaluation S/W and takes Cross Polar Radiation as well as radiation in the diagonal cuts into consideration for the performance calculation. The earlier version did not do that. This gives a more correct picture of the performance of each feed. Phase_CP can be used for both circularly and linearly polarized feeds with great success Swedish EME-meeting May
6 Wave Guide modes The lowest mode that propagate in a circular WG is called TE11. E-field H-field Swedish EME-meeting May
7 Wave Guide size and λg (10368 MHz)/ λc for TE11 1% change in WG diameter => 3% change in λg Swedish EME-meeting May
8 Septum considerations The septum shall generate a circularly polarized wave in a way that it contains only one polarization direction in each port. This ensures that we have Good Axial Ratio Low Cross Polar Radiation It shall also ensure good isolation between the two ports, Tx and Rx It shall do this over a reasonable band width In these designs this is accomplished by using a 5 step septum plate Swedish EME-meeting May
9 E-field variation over a full cycle Swedish EME-meeting May
10 Feed without choke No beam shaping in Co-pol High Cross-pol level in 180 deg Mediocre efficiency High noise temperature SM6FHZ Y1 ANSOFT FF Pattern Phi=0 deg SM6FHZ_23_Septum_134_no_choke m1 Name X Y m m m m2 m3 m m m4 m5 Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz'... db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... Feed Radiation Pattern 0 db SM6FHZ 23 cm septum feed w/o choke RHCP Total Dish diameter = 23.8 λ Feed diameter = 1 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Theta [deg] Parabolic Dish f/d Swedish EME-meeting May W1GHZ 1998, 2010
11 Why a Kumar choke? The Kumar choke is a efficient yet simple way of shaping the radiation pattern of the feed. It was first described by Dr. A. Kumar [ Reduce Cross-Polarization In Reflector-Type Antennas, Microwaves, March 1978 ] and has been used by VE4MA in his feed designs. It has some limitations and interactions with the other parts of the feed. The Axial Ratio at angular offsets from bore sight is controlled by the choke The Return Loss and Isolation is not affected by the choke The radiation pattern can be controlled by the position and the size of the choke Less elaborate than the Scalar choke but comparable or superior performance It can be optimized using EM-simulation SW. Swedish EME-meeting May
12 Septum - choke interaction 4.00 Axial ratio optimization Theta [deg] The septum sets the Axial Ratio at bore site and the choke governs the performance at angular off-sets from bore sight The choke does not change the axial ratio at bore sight very much A well functioning septum is essential for getting a decent axial ratio also off bore sight Swedish EME-meeting May
13 Choke impact on radiating pattern There is a contradiction between the wanted amplitude pattern and the phase error with respect to illumination angle By adjusting the choke position and dimensions you can find the best compromise Moving the choke with respect to the W/G mouth does not directly scale the feed pattern for other f/d s. There is a price to pay. The best way to strive for optimal performance at other f/d s is to change the dimension of the W/G mouth There are limitations on how much you can change the dimension of the W/G and maintaining the same W/G propagation mode W2IMU uses this in his Dual Mode Feed going to a higher mode as well as the first mode in the outer WGsection in an controlled way Swedish EME-meeting May
14 ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT FF Pattern quick comparison Choke position relative WG-mouth 0L -0.05L -0.1L SM6FHZ Name X Y m m m m m FF Pattern Phi=0 deg m1 VE4MA_super_SM6FHZ_flush SM6FHZ Name X Y m m m m m m2 FF Pattern Phi=0 deg m1 m3 VE4MA_super_SM6FHZ_05 SM6FHZ Name X Y m m m m m m2 FF Pattern Phi=0 deg m1 m3 VE4MA_super_SM6FHZ_ m2 m3 m4 m5 m4 m m4 m5 Y Y Y SM6FHZ Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] -0.15L FF Pattern Phi=0 deg VE4MA_super_SM6FHZ_3 Name X Y m m m m1 m m2 m3 m m4 m5 Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] -0.18L SM6FHZ FF Pattern Phi=0 deg VE4MA_super_SM6FHZ_ Name X Y m m m m1 m m m2 m m4 m Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] -0.2L SM6FHZ FF Pattern Phi=0 deg VE4MA_super_SM6FHZ_ Name X Y m1 m m m2 m3 m m m4 m m Y Y1 Y Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Curve Inf o db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] -0.25L -0.3L SM6FHZ FF Pattern Phi=0 deg VE4MA_super_SM6FHZ_25 SM6FHZ FF Pattern Phi=0 deg m1 VE4MA_super_SM6FHZ_30 m1 Name X Y m Name X Y m m m m m m2 m m m m m m4 m2 m3 m5 m4 m Y1 Y Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... Theta [deg] Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Swedish EME-meeting May
15 ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT FF Phase error quick comparison Choke position relative WG-mouth SM6FHZ L FF Phase Phi=0 deg VE4MA_super_SM6FHZ_flush SM6FHZ Name X Y m m l FF Phase Phi=0 deg VE4MA_super_SM6FHZ_05 Curve Inf o cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' SM6FHZ Name X Y m m l FF Phase Phi=0 deg VE4MA_super_SM6FHZ_10 Curve Inf o cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' cang_deg(rerhcp) [deg] cang_deg(rerhcp) [deg] m2 cang_deg(rerhcp) [deg] m m Curve Info cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d( m1,m2) m Theta [deg] Theta [deg] Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d( m1,m2 ) Theta [deg] -0.15L -0.18L -0.2L SM6FHZ FF Phase Phi=0 deg Curve Info VE4MA_super_SM6FHZ_3 SM6FHZ FF Phase Phi=0 deg Curve Inf o VE4MA_super_SM6FHZ_18 SM6FHZ FF Phase Phi=0 deg Curve Inf o VE4MA_super_SM6FHZ_20 cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' Name X Y cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' m m Name X Y m m cang_deg(rerhcp) [deg] cang_deg(rerhcp) [deg] m2 m1 cang_deg(rerhcp) [deg] m2 m Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d( m1,m2) Theta [deg] Theta [deg] Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d( m1,m2) Theta [deg] SM6FHZ L FF Phase Phi=0 deg Curve Inf o VE4MA_super_SM6FHZ_25 SM6FHZ L FF Phase Phi=0 deg Curve Info VE4MA_super_SM6FHZ_30 Name X Y m m cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' Name X Y m m cang_deg(rerhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h=' cang_deg(rerhcp) [deg] m2 m1 cang_deg(rerhcp) [deg] m2 m Theta [deg] Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d(m1,m2) Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y) d( m1,m2 ) Swedish EME-meeting Theta [deg] May
16 ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT ANSOFT Axial Ratio quick comparison Choke position relative WG-mouth SM6FHZ L AxialRatio VE4MA_super_SM6FHZ_flush Curve Info Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... SM6FHZ L AxialRatio VE4MA_super_SM6FHZ_05 Curve Inf o Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... SM6FHZ L AxialRatio VE4MA_super_SM6FHZ_10 Curve Inf o Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Theta [deg] Theta [deg] -0.15L -0.18L -0.2L SM6FHZ AxialRatio VE4MA_super_SM6FHZ_3 Curve Info Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... SM6FHZ AxialRatio VE4MA_super_SM6FHZ_18 Curve Inf o Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... SM6FHZ AxialRatio VE4MA_super_SM6FHZ_20 Curve Inf o Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Theta [deg] Theta [deg] SM6FHZ L AxialRatio VE4MA_super_SM6FHZ_25 Curve Info Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length... SM6FHZ L AxialRatio VE4MA_super_SM6FHZ_30 Curve Inf o Freq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len... Freq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt... Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length Theta [deg] Swedish EME-meeting May Theta [deg]
17 Putting the Feed in a Dish Dish Reflexion Pointing your feed into the dish will result in a reflected wave from the dish entering the feed. The level of the reflexion coefficient (Γ) will be dependant on the gain of the feed (G), lambda (λ), and the focal length of the dish (f). Swedish EME-meeting May
18 Putting the Feed in a Dish Dish Reflexion How bad can it get? With a linear feed you will see the reflected wave on the Tx port but with a circular polarized feed the reflected wave will show up in the Rx port due to the phase reversal upon the reflexion in the dish surface. This affects the isolation between Tx and Rx MHz, VE4MA type feed in a 5.5m, 0.37 f/d dish will result in 29 db RL MHz, W2IMU type feed in a 8m, 0.45 f/d dish will result in 26 db RL MHz, VE4MA type feed in a 5.5m, 0.37 f/d dish will result in >40 db RL MHz, VE4MA type feed in a 2m, 0.37 f/d dish will result in 33 db RL MHz, VE4MA type feed in a 5.5m, 0.37 f/d dish will result in 47 db RL MHz, VE4MA type feed in a 2m, 0.37 f/d dish will result in 38 db RL. A spread-sheet can be found on my web page for your own further testing. RA3AQ proposes using a small metal coin in the centre of the feed aperture in order to fine tune the isolation in situ. This need to be done specifically for each installation but can yield excellent isolation over a narrow frequency band Summary. This reflexion is not a major problem on the higher bands on larger dishes. If the reflexion is down below the 30 db RL region you may consider to address it. Swedish EME-meeting May
19 InDish Performance A quick look at all 6 feeds
20 InDish Performance 23 cm (5.5 m dish) SM6FHZ 23 cm Septum feed 0.71L WG SM6FHZ 23 cm septum feed 0.795L WG Feed Radiation Pattern 0 db RHCP Total Dish diameter = 23.8 λ Feed diameter = 2 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Feed Radiation Pattern 0 db RHCP Total Dish diameter = 23.8 λ Feed diameter = 2 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, Parabolic Dish f/d W1GHZ 1998, cm 0.71 L W/G feed performance 23 cm L W/G feed performance Swedish EME-meeting May
21 InDish Performance 9/6 cm SM6FHZ 9 cm Kumar feed SM6FHZ Kumar 6 cm wl Feed Radiation Pattern Dish diameter = 62.4 λ Feed diameter = 3 λ Parabolic Dish Efficiency % 0 db LHCP Total Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.05 λ inside aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Feed Radiation Pattern 0 db Dish diameter = 92 λ Parabolic Dish Efficiency % LHCP Total Feed diameter = 5 λ Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, cm feed performance (5.5m dish) Parabolic Dish f/d W1GHZ 1998, cm feed performance (5.5 m dish) Swedish EME-meeting May
22 InDish Performance 3 cm (1.8 m dish) SM6FHZ 3 cm septum feed 0.692L WG SM6FHZ 3 cm septum feed 0.795L WG Feed Radiation Pattern Dish diameter = 63 λ Parabolic Dish Efficiency % 0 db LHCP Total Feed diameter = 5 λ Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Feed Radiation Pattern 0 db LHCP Total Dish diameter = 62.2 λ Feed diameter = 5 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.03 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, Parabolic Dish f/d W1GHZ 1998, cm L W/G feed performance 3 cm L W/G feed performance Swedish EME-meeting May
23 SM6FHZ 23 cm 5 step septum feed 0.71 lambda W/G
24 Solid and transparent models from the simulation (23 cm 0.71 wl WG) Swedish EME-meeting May
25 WG and choke dimensions (23 cm 0.71 wl WG) Phase center -5.0 Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas outer T= 0.5 wall T= 1.0 bottom Tx LHCP Rx RHCP outer Wave guide 165/164 mm copper tube 654 outer 1.0 mm bottom plate included Swedish EME-meeting May
26 Septum dimensions (23 cm 0.71 wl WG) Wave guide 165/164 mm copper tube Septum t = 0.8 mm copper Inner measure Bottom plate not included Bottom plate 1.0 mm copper Swedish EME-meeting May
27 Probe dimensions (23 cm 0.71 wl WG) 4.0 diam inner Swedish EME-meeting May
28 InDish performance including G/T SM6FHZ 23cm Kumar Septum Feed 0.71wl WG InDish performance including G/T Graph produced by W1GHZ Feed_GT SW Possible to compare with graph on page 3 in W1GHZ EME 2014 presentation ~0.7 db G/T advantage for this feed at 45 deg elevation and less sensitive to different elevations Feed Radiation Pattern 0 db planes Dish diameter = 20 λ Parabolic Dish Efficiency % RHCP Total Feed diameter = 1.9 λ Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.01 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: 25 db MAX Efficiency without phase error Illumination REAL WORLD at least 15% lower Spillover 24 db Feed Blockage G/T at 70 Elevation G/T at 45 Elevation G/T at 20 Elevation Parabolic Dish f/d Tsky = 5.7K TGnd = 290K Trcvr = 0K Solid Dish W1GHZ 1998, 2014 G/T 23 db 22 db 21 db 20 db 19 db 18 db 17 db Swedish EME-meeting May
29 G3LTF dish performance Calculated performance for G3LTF dish with this feed Graph produced by W1GHZ Feed_GT SW Possible to compare with graph on page 17 in W1GHZ EME 2014 presentation ~0.4 db G/T advantage for this feed at 45 deg at an f/d of 0.37 Feed Radiation Pattern G3LTF 23cm SM6FHZ Kumar Septum 0.71wl 0 db planes Dish diameter = 25.9 λ Feed diameter = 1.9 λ Parabolic Dish Efficiency % Swedish EME-meeting May RHCP Total Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.01 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: 22 db MAX Efficiency without phase error Illumination REAL WORLD at least 15% lower Spillover 21 db Feed Blockage G/T at 70 Elevation G/T at 45 Elevation G/T at 20 Elevation Parabolic Dish f/d Tsky = 8K TGnd = 290K Trcvr = 21K Solid Dish W1GHZ 1998, 2014 G/T 20 db 19 db 18 db 17 db 16 db 15 db 14 db
30 S11, S22, S21 combined (23 cm 0.71 wl WG) SM6FHZ Name X Y m m S11, S22 and S21 combined SM6FHZ_23_Septum_134_4 ANSOFT Curve Info db(s(waveport1,waveport1)) Setup1 : Sw eep1 Prob_pos='-697.3mm' db(s(waveport2,waveport2)) Setup1 : Sw eep1 Prob_pos='-697.3mm' db(s(waveport2,waveport1)) Setup1 : Sw eep1 Prob_pos='-697.3mm' Y m m Freq [GHz] Swedish EME-meeting May
31 3D Total Power Far Field pattern (23 cm 0.71 wl WG) Swedish EME-meeting May
32 Far Field Pattern 0 deg (23 cm 0.71 wl WG) SM6FHZ FF Pattern Phi=0 deg SM6FHZ_23_Septum_134_4 ANSOFT Name X Y 0.00 m m m m m m4 m2 m1 m3 m Y Curve Info db(dirrhcp) $Prob1D='3mm' $Prob1L=' mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz'... db(dirlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_ Theta [deg] Swedish EME-meeting May
33 Far Field Phase error (23 cm 0.71 wl WG) SM6FHZ FF Phase Theta Phi SM6FHZ_23_Septum_134_4 Curve Info ang_deg(rephi) Freq='1.296GHz' Phi='0deg' Prob_pos='-697.3mm' ang_deg(retheta) Freq='1.296GHz' Phi='90deg' Prob_pos='-697.3mm' ANSOFT Y1 [deg] Theta [deg] Swedish EME-meeting May
34 SM6FHZ db(polarizationratiocircularlhcp) Cross Polar Ratio (23 cm 0.71 wl WG) Cross Polarization Ratio Curve Info SM6FHZ_23_Septum_134_4 db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6... ANSOFT Theta [deg] Swedish EME-meeting May
35 SM6FHZ Axial Ratio (23 cm 0.71 wl WG) AxialRatio Curve Info SM6FHZ_23_Septum_134_4 Freq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... Freq='1.296GHz' Phi='45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... Freq='1.296GHz' Phi='90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_... Freq='1.296GHz' Phi='135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6... ANSOFT Theta [deg] Swedish EME-meeting May
36 SM6FHZ 23 cm 5 step septum feed lambda W/G
37 Solid and transparent models from the simulation (23 cm wl WG) Swedish EME-meeting May
38 WG and choke dimensions (23 cm wl WG) Phase center 4.0 Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP outer Rx RHCP 460 outer Wave guide 186/184 mm copper tube T= 0.5 wall T= 1.0 bottom 670 outer 1.0 mm bottom plate included Swedish EME-meeting May
39 Septum dimensions (23 cm wl WG) Wave guide 186/184 mm copper tube Septum t = 1.0 mm copper Inner measure Bottom plate not included Bottom plate 1.0 mm copper Swedish EME-meeting May
40 Probe dimensions (23 cm wl WG) 4.0 diam inner Swedish EME-meeting May
41 S11, S22, S21 combined SM6FHZ Name X Y m m m (23 cm wl WG) S11, S22 and S21 combined SM6FHZ_septum_23_18_4 ANSOFT Curve Info db(s(1,1)) Setup1 : Sw eep Prob_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm' db(s(2,2)) Setup1 : Sw eep Prob_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm' db(s(2,1)) Setup1 : Sw eep Prob_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm' Y m m m Freq [GHz] Swedish EME-meeting May
42 Complex impedance Rx-port SM6FHZ (23 cm wl WG) Smith Chart Rx-port SM6FHZ_septum_23_18_4 ANSOFT Name Freq Ang Mag RX m i Curve Info S(2,2) Setup1 : Sw eep m Swedish EME-meeting May
43 3D Total Power Far Field pattern (23 cm wl WG) Swedish EME-meeting May
44 Far Field Pattern 0 deg (23 cm wl WG) SM6FHZ FF Pattern, Phi=0 deg SM6FHZ_septum_23_18_4 Curve Info db(dirrhcp) Freq='1.296GHz' Phi='0deg' db(dirlhcp) Freq='1.296GHz' Phi='0deg' ANSOFT Y Theta [deg] Swedish EME-meeting May
45 Far Field Phase error (23 cm wl WG) SM6FHZ FF Phase error SM6FHZ_septum_23_18_4 Curve Info ang_deg(rephi) Freq='1.296GHz' Phi='0deg' ang_deg(retheta) Freq='1.296GHz' Phi='90deg' ANSOFT Y1 [deg] Theta [deg] Swedish EME-meeting May
46 Cross Polar Ratio (23 cm wl WG) SM6FHZ FF Cross Polar Ratio SM6FHZ_septum_23_18_4 Curve Info db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='0deg' db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='45deg' db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='90deg' db(polarizationratiocircularlhcp) Freq='1.296GHz' Phi='135deg' ANSOFT db(polarizationratiocircularlhcp) Theta [deg] Swedish EME-meeting May
47 SM6FHZ Axial Ratio (23 cm wl WG) FF Axial Ratio SM6FHZ_septum_23_18_4 Curve Info Freq='1.296GHz' Phi='0deg' Freq='1.296GHz' Phi='45deg' Freq='1.296GHz' Phi='90deg' Freq='1.296GHz' Phi='135deg' ANSOFT Theta [deg] Swedish EME-meeting May
48 SM6FHZ 9 cm 5 step septum feed lambda W/G
49 Model (9 cm wl WG) Swedish EME-meeting May
50 Transparent model (9 cm wl WG) Swedish EME-meeting May
51 WG and choke dimensions (9 cm wl WG) Phase center 2.0 Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas outer T= 0.5 wall T= 1.0 bottom outer 218.7outer 0.5 mm bottom plate included Tx LHCP Rx RHCP Wave guide 70/66 mm copper tube Swedish EME-meeting May
52 Septum dimensions (9 cm wl WG) Wave guide 70/66 mm copper tube Septum t = 1.0 mm copper 63.1 Inner measure Bottom plate not included 66.0 Bottom plate 0.5 mm copper Swedish EME-meeting May
53 Probe dimensions (9 cm wl WG) 2.0 diam inner Swedish EME-meeting May
54 FF 3D Total Power pattern (9 cm wl WG) Swedish EME-meeting May
55 FF Directivity pattern (9 cm wl WG) SM6FHZ Directivity_Phi90 SM6FHZ_septum_feed_w_choke6 Curve Info db(dirlhcp) Freq='3.4GHz' Phi='90deg' db(dirrhcp) Freq='3.4GHz' Phi='90deg' ANSOFT Y Theta [deg] Swedish EME-meeting May
56 SM6FHZ S11, S22 and S21 combined (9 cm wl WG) S11, S22 and S21 combined SM6FHZ_septum_feed_w_choke6 ANSOFT Curve Info db(s(rxport,rxport)) Setup1 : Sw eep db(s(txport,txport)) Setup1 : Sw eep db(s(txport,rxport)) Setup1 : Sw eep Name X Y m m Y m m Freq [GHz] Swedish EME-meeting May
57 Name Freq Ang Mag RX m i m i m i m i Complex impedance Rx-port (9 cm wl WG) Rx_port_imp SM6FHZ_septum_feed_w_choke6 Curve Info S(RxPort,RxPort) Setup1 : Sw eep ANSOFT m4 m m m Swedish EME-meeting May
58 FF Phase error (9 cm wl WG) SM6FHZ FF Phase Error SM6FHZ_septum_feed_w_choke6 Curve Info ang_deg(rephi) Freq='3.4GHz' Phi='0deg' ang_deg(retheta) Freq='3.4GHz' Phi='90deg' ANSOFT Y1 [deg] Theta [deg] Swedish EME-meeting May
59 SM6FHZ db(polarizationratiocircularrhcp) Cross Polarization Ratio (9 cm wl WG) PolarizationRatio SM6FHZ_septum_feed_w_choke6 Curve Info db(polarizationratiocircularrhcp) Freq='3.4GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='3.4GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='3.4GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='3.4GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='3.4GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
60 Axial Ratio (9 cm wl WG) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke6 Curve Info Freq='3.4GHz' Phi='0deg' Freq='3.4GHz' Phi='45deg' Freq='3.4GHz' Phi='90deg' Freq='3.4GHz' Phi='135deg' Freq='3.4GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
61 Realization 9, 6 and 3 cm feeds comparison Swedish EME-meeting May
62 Measured performance with partial septum soldering (9 cm wl WG) Swedish EME-meeting May
63 Measured performance (9 cm wl WG) Swedish EME-meeting May
64 Measured complex impedance (9 cm wl WG) Reference plane about 15 mm (~0.25 WL in teflon) out from the simulated case. SMA connector on feed included in measurement. Measurement sweep 200 MHz wider than simulation sweep Very good agreement between simulated and measured performance. Swedish EME-meeting May
65 InDish Performance, 1.8 and 2.2 m dish (9 cm wl WG) SM6FHZ 9 cm septum feed in 1.8 m dish SM6FHZ 9 cm septum feed in 2.2 m dish Feed Radiation Pattern 0 db LHCP Total Dish diameter = 20.4 λ Feed diameter = 2 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.06 λ inside aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Feed Radiation Pattern 0 db LHCP Total Dish diameter = 24.9 λ Feed diameter = 2 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0.06 λ inside aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, Parabolic Dish f/d W1GHZ 1998, 2010 Swedish EME-meeting May
66 SM6FHZ 6 cm 5 step septum feed lambda W/G
67 Solid and transparent models from the simulation (6 cm wl WG) Swedish EME-meeting May
68 WG and choke dimensions (6 cm wl WG) Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx 26 outer RHCP outer Wave guide 42/39 mm copper tube T= 0.5 wall T= 1.0 bottom outer 0.5 mm bottom plate included Swedish EME-meeting May
69 Septum dimensions (6 cm wl WG) Wave guide 42/39 mm copper tube Septum t = 1.0 mm copper 37.3 Inner measure Bottom plate not included 39.0 Bottom plate 0.5 mm copper Swedish EME-meeting May
70 Probe dimensions (6 cm wl WG) diam inner Swedish EME-meeting May
71 FF 3D Total Power pattern (6 cm wl WG) Swedish EME-meeting May
72 FF Directivity pattern (6 cm wl WG) SM6FHZ Directivity_Phi90 SM6FHZ_septum_feed_w_choke_42_22 Curve Info db(dirlhcp) Freq='5.76GHz' Phi='90deg' db(dirrhcp) Freq='5.76GHz' Phi='90deg' ANSOFT Y Theta [deg] Swedish EME-meeting May
73 SM6FHZ Name X Y S11, S22 and S21 combined m m (6 cm wl WG) S11, S22 and S21 combined SM6FHZ_septum_feed_w_choke_42_22 ANSOFT Curve Info db(s(rxport,rxport)) Setup1 : Sw eep db(s(txport,txport)) Setup1 : Sw eep db(s(txport,rxport)) Setup1 : Sw eep Y m Freq [GHz] Swedish EME-meeting May m1
74 Complex impedance Rx-port (6 cm wl WG) Name Freq Ang Mag RX m i m i m i m i Smith Chart SM6FHZ_septum_feed_w_choke_42_22 Curve Info S(RxPort,RxPort) Setup1 : Sw eep ANSOFT m4 m1 m31.00 m Swedish EME-meeting May
75 Measurements (6 cm wl WG) Swedish EME-meeting May
76 FF Phase error (6 cm wl WG) SM6FHZ FF_phase_combined SM6FHZ_septum_feed_w_choke_42_22 Curve Info ang_deg(rephi) Freq='5.76GHz' Phi='0deg' ang_deg(retheta) Freq='5.76GHz' Phi='90deg' ANSOFT Y1 [deg] Theta [deg] Swedish EME-meeting May
77 Cross Polarization Ratio (6 cm wl WG) SM6FHZ db(polarizationratiocircularrhcp) PolarizationRatio SM6FHZ_septum_feed_w_choke_42_22 Curve Info db(polarizationratiocircularrhcp) Freq='5.76GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='5.76GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='5.76GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='5.76GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='5.76GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
78 Axial Ratio (6 cm wl WG) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke_42_22 Curve Info Freq='5.76GHz' Phi='0deg' Freq='5.76GHz' Phi='45deg' Freq='5.76GHz' Phi='90deg' Freq='5.76GHz' Phi='135deg' Freq='5.76GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
79 InDish Performance (6 cm wl WG) PGP 1.8 m dish w. FHZ 6 cm Kumar feed PGP 2.2 m dish w. FHZ Kumar 6 cm feed Feed Radiation Pattern 0 db LHCP Total Dish diameter = 34.6 λ Feed diameter = 3 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Feed Radiation Pattern 0 db LHCP Total Dish diameter = 42.2 λ Feed diameter = 3 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = 0 λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, Parabolic Dish f/d W1GHZ 1998, 2010 Swedish EME-meeting May
80 Realization (6 cm wl WG) Swedish EME-meeting May
81 SM6FHZ 3 cm 5 step septum feed lambda W/G
82 Solid and transparent models from the simulation (3 cm wl WG) Swedish EME-meeting May
83 WG and choke dimensions (3 cm wl WG) Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx 14.4 outer RHCP 57.8 outer Wave guide 22/20 mm copper tube T= 0.5 wall T= 1.0 bottom 85.8 outer 1.0 mm bottom plate included Swedish EME-meeting May
84 Septum dimensions (3 cm wl WG) Wave guide 22/20 mm copper tube Septum t = 1.0 mm copper 24.0 Inner measure Bottom plate not included 20.0 Bottom plate 1.0 mm copper Swedish EME-meeting May
85 Probe dimensions (3 cm wl WG) 1.3 diam inner Swedish EME-meeting May
86 S11, S22, S21 combined (3 cm wl WG) SM6FHZ S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke4 ANSOFT Curve Info db(s(rxport,rxport)) Setup1 : Sw eep db(s(txport,txport)) Setup1 : Sw eep db(s(txport,rxport)) Setup1 : Sw eep Y Name X Y m m m m m m m1 m m3 m m5 m Freq [GHz] Swedish EME-meeting May
87 3D Total Power Far Field pattern (3 cm wl WG) Swedish EME-meeting May
88 Far Field Pattern 0 deg (3 cm wl WG) SM6FHZ Directivity_Phi0 SM6FHZ_septum_feed_w_choke4 Curve Info db(dirlhcp) Freq='10.368GHz' Phi='0deg' db(dirrhcp) Freq='10.368GHz' Phi='0deg' ANSOFT Y Theta [deg] Swedish EME-meeting May
89 Far Field Phase (3 cm wl WG) SM6FHZ FF_phase_Phi90 SM6FHZ_septum_feed_w_choke4 Curve Info ang_deg(retheta) Freq='10.368GHz' Phi='90deg' ANSOFT ang_deg(retheta) [deg] Theta [deg] Swedish EME-meeting May
90 Cross Polar Ratio (3 cm wl WG) SM6FHZ PolarizationRatio SM6FHZ_septum_feed_w_choke4 Curve Info db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='180deg' ANSOFT db(polarizationratiocircularrhcp) Theta [deg] Swedish EME-meeting May
91 Axial Ratio (3 cm wl WG) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke4 Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
92 Realization (3 cm wl WG) Swedish EME-meeting May
93 +0.2 mm WG-diam, +1 mm septum, SM6FHZ mm WG-length (3 cm wl WG) S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke8 ANSOFT Curve Info db(s(rxport,rxport)) Setup1 : Sw eep db(s(txport,txport)) Setup1 : Sw eep db(s(txport,rxport)) Setup1 : Sw eep m2 Y Name X Y m m m m m m m1 m3 m6 m m Freq [GHz] Swedish EME-meeting May
94 WG and choke dimensions (3 cm wl WG) Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx 14.4 outer RHCP 57.8 outer Wave guide 22/20.2 mm copper tube T= 0.5 wall T= 1.0 bottom 84.3 outer 1.0 mm bottom plate included Swedish EME-meeting May
95 Septum dimensions (3 cm wl WG) Wave guide 22/20.2 mm copper tube Septum t = 1.0 mm copper 24.0 Inner measure Bottom plate not included 20.2 Bottom plate 1.0 mm copper Swedish EME-meeting May
96 Probe dimensions (3 cm wl WG) 1.3 diam inner Swedish EME-meeting May
97 20,2 mm WG-inner diam optimized (3 cm wl WG) SM6FHZ S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke10 ANSOFT Curve Info db(s(rxport,rxport)) Setup1 : Sw eep db(s(txport,txport)) Setup1 : Sw eep db(s(txport,rxport)) Setup1 : Sw eep Y Name X Y m m m m m m m1 m4 m2 m6 m m Freq [GHz] Swedish EME-meeting May
98 Measurements (3 cm wl WG) Swedish EME-meeting May
99 Far Field Pattern 0 deg (3 cm wl WG) SM6FHZ Directivity_Phi0 SM6FHZ_septum_feed_w_choke10 Curve Info db(dirlhcp) Freq='10.368GHz' Phi='0deg' db(dirrhcp) Freq='10.368GHz' Phi='0deg' ANSOFT Y Theta [deg] Swedish EME-meeting May
100 FF Phase error (3 cm wl WG) SM6FHZ FF Phase error SM6FHZ_septum_feed_w_choke10 Curve Info ang_deg(rephi) Freq='10.368GHz' Phi='0deg' Septum3_height='-11.6mm' ang_deg(retheta) Freq='10.368GHz' Phi='90deg' Septum3_height='-11.6mm' ANSOFT Y1 [deg] Theta [deg] Swedish EME-meeting May
101 Axial Ratio (3 cm wl WG) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke10 Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' ANSOFT Theta [deg] Swedish EME-meeting May
102 SM6FHZ 3 cm 5 step septum feed lambda W/G
103 Solid and transparent models from the simulation (3 cm wl WG) Swedish EME-meeting May
104 WG and choke dimensions (3 cm wl WG) Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx 14.9 outer RHCP 60.0 outer Wave guide 25/22 mm brass tube T= 0.5 wall T= 1.0 bottom 76.3 outer 1.0 mm bottom plate included Swedish EME-meeting May
105 Septum dimensions (3 cm wl WG) Wave guide 25/22 mm brass tube Septum t = 1.0 mm copper 27.0 Inner measure Bottom plate not included 22.0 Bottom plate 1.0 mm brass Swedish EME-meeting May
106 Probe dimensions (3 cm wl WG) 1.4 diam inner Swedish EME-meeting May
107 S11, S22, S21 combined (3 cm wl WG) SM6FHZ Name X Y m m m m m m S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke4_86_8 Curve Info db(s(txport,txport)) Setup1 : Sw eep Probe_pos='-65.8mm' db(s(rxport,rxport)) Setup1 : Sw eep Probe_pos='-65.8mm' db(s(txport,rxport)) Setup1 : Sw eep Probe_pos='-65.8mm' Y m1 m m3 m5 m6 m Freq [GHz] Swedish EME-meeting May
108 3D Total Power Far Field pattern (3 cm wl WG) Swedish EME-meeting May
109 Far Field Pattern 0 deg (3 cm wl WG) SM6FHZ Directivity_Phi90 SM6FHZ_septum_feed_w_choke4_86_8 Curve Info db(dirlhcp) Freq='10.368GHz' Phi='90deg' db(dirrhcp) Freq='10.368GHz' Phi='90deg' Y Theta [deg] Swedish EME-meeting May
110 Far Field Phase error (3 cm wl WG) SM6FHZ FF Phase error SM6FHZ_septum_feed_w_choke4_86_8 Curve Info ang_deg(rephi) Freq='10.368GHz' Phi='0deg' ang_deg(retheta) Freq='10.368GHz' Phi='90deg' Y1 [deg] Theta [deg] Swedish EME-meeting May
111 Cross Polar Ratio (3 cm wl WG) SM6FHZ PolarizationRatio SM6FHZ_septum_feed_w_choke4_86_8 Curve Info db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='180deg' db(polarizationratiocircularrhcp) Theta [deg] Swedish EME-meeting May
112 Axial Ratio (3 cm wl WG) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke4_86_8 Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' Theta [deg] Swedish EME-meeting May
113 SM6FHZ 3 cm 5 step septum feed for f/d ~ lambda W/G and a Dual Mode output section
114 Solid and transparent models from the simulation (3 cm wl WG Dual Mode 39mm) Swedish EME-meeting May
115 WG and choke dimensions (3 cm wl WG Dual Mode 39mm) Phase center flush with WG opening Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas outer 19 outer 39/42 copper tube T= 1.5 wall Tx LHCP Rx RHCP 35.0 outer Wave guide 25/22 mm brass tube 84.8 outer 1.0 mm bottom plate included Swedish EME-meeting May
116 Detail of WG / transformer and output section (3 cm wl WG Dual Mode 39mm) Phase center flush with WG opening 52.5 outer 39/42 copper tube 1 mm overlap between tubes of transformer and wave guide and output section respectively. 19 outer 35.0 outer Transformer section made from 32/35 copper tube or turned from 40 mm solid brass stock to fit with WG and output section. If a tube is used, fittings between the transformer section and the wave guide and output section respectively need to be made from brass or Swedish EME-meeting May 2013 copper. 116
117 Septum dimensions (3 cm wl WG Dual Mode 39mm) Wave guide 25/22 mm brass tube Septum t = 1.0 mm copper 27.0 Inner measure Bottom plate not included 22.0 Bottom plate 1.0 mm brass Swedish EME-meeting May
118 Probe dimensions (3 cm wl WG Dual Mode 39mm) 1.4 diam inner Swedish EME-meeting May
119 Wave Guide propagation modes in SM6FHZ 10 GHz Dual Mode Feed at 0 degrees E-field H-field Swedish EME-meeting May
120 InDish performance SM6FHZ 3 cm Dual Mode Feed Feed Radiation Pattern 0 db RHCP Total Dish diameter = 190 λ Feed diameter = 10 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, 2010 Swedish EME-meeting May
121 S11, S22, S21 combined (3 cm wl WG Dual Mode 39mm) SM6FHZ Name X Y m m m m m m S11, S22 & S21 combined SM6FHZ_septum_feed_coax_high_f_D_3 Curve Info db(s(txport,txport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(rxport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(txport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' Y m2 m1 m5 m3 m6 m Freq [GHz] Swedish EME-meeting May
122 3D Total Power Far Field pattern (3 cm wl WG Dual Mode 39mm) Swedish EME-meeting May
123 Far Field Pattern 0 deg (3 cm wl WG Dual Mode 39mm) SM6FHZ Directivity_Phi0 SM6FHZ_septum_feed_coax_high_f_D_3 Curve Info db(dirlhcp) Freq='10.368GHz' Phi='0deg' db(dirrhcp) Freq='10.368GHz' Phi='0deg' Y Theta [deg] Swedish EME-meeting May
124 Far Field Phase error (3 cm wl WG Dual Mode 39mm) SM6FHZ FF Phase error SM6FHZ_septum_feed_coax_high_f_D_3 Curve Info ang_deg(rephi) Freq='10.368GHz' Phi='0deg' Probe_pos='-65.9mm' ang_deg(retheta) Freq='10.368GHz' Phi='90deg' Probe_pos='-65.9mm' Y1 [deg] Theta [deg] Swedish EME-meeting May
125 Cross Polar Ratio (3 cm wl WG Dual Mode 39mm) SM6FHZ PolarizationRatio SM6FHZ_septum_feed_coax_high_f_D_3 Curve Info db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='180deg' db(polarizationratiocircularrhcp) Theta [deg] Swedish EME-meeting May
126 Axial Ratio (3 cm wl WG Dual Mode 39mm) SM6FHZ AxialRatio SM6FHZ_septum_feed_coax_high_f_D_3 Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' Theta [deg] Swedish EME-meeting May
127 SM6FHZ 3 cm 5 step septum feed lambda W/G Using standard one inch brass / copper tubing
128 Solid and transparent models from the simulation (3 cm wl WG inch tube) Swedish EME-meeting May
129 WG and choke dimensions (3 cm wl WG inch tube) Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx 14.9 outer RHCP 60.0 outer T= 0.5 wall T= 1.0 bottom 76.3 outer 1.0 mm bottom plate included Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Swedish EME-meeting May
130 Septum dimensions (3 cm wl WG inch tube) Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Septum t = 1.0 mm copper 27.0 Inner measure Bottom plate not included 22.0 Bottom plate 1.0 mm brass Swedish EME-meeting May
131 Probe dimensions (3 cm wl WG inch tube) 1.4 diam inner Swedish EME-meeting May
132 S11, S22, S21 combined (3 cm wl WG inch tube) SM6FHZ Name X Y m m m m m m S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke4_86_8_inch Curve Info db(s(txport,txport)) Setup1 : Sw eep Probe_pos='-65.8mm' db(s(rxport,rxport)) Setup1 : Sw eep Probe_pos='-65.8mm' db(s(txport,rxport)) Setup1 : Sw eep Probe_pos='-65.8mm' Y m m4 m m m3 m Freq [GHz] Swedish EME-meeting May
133 3D Total Power Far Field pattern (3 cm wl WG inch tube) Swedish EME-meeting May
134 Far Field Pattern 0 deg (3 cm wl WG inch tube) Directivity_Phi0 SM6FHZ_septum_feed_w_choke4_86_8_inch Curve Info db(dirlhcp) Freq='10.368GHz' Phi='0deg' db(dirrhcp) Freq='10.368GHz' Phi='0deg' Y Theta [deg] Swedish EME-meeting May
135 Far Field Phase error (3 cm wl WG inch tube) SM6FHZ FF Phase error SM6FHZ_septum_feed_w_choke4_86_8_inch Curve Info ang_deg(rephi) Freq='10.368GHz' Phi='0deg' ang_deg(retheta) Freq='10.368GHz' Phi='90deg' Y1 [deg] Theta [deg] Swedish EME-meeting May
136 Cross Polar Ratio (3 cm wl WG inch tube) SM6FHZ PolarizationRatio SM6FHZ_septum_feed_w_choke4_86_8_inch Curve Info db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='180deg' db(polarizationratiocircularrhcp) Theta [deg] Swedish EME-meeting May
137 Axial Ratio (3 cm wl WG inch tube) SM6FHZ AxialRatio SM6FHZ_septum_feed_w_choke4_86_8_inch Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' Theta [deg] Swedish EME-meeting May
138 SM6FHZ 3 cm 5 step septum feed for f/d ~ lambda W/G and a Dual Mode output section Using standard one inch brass / copper tubing
139 Solid and transparent models from the simulation (3 cm wl WG Dual Mode 39mm inch tube) Swedish EME-meeting May
140 WG and choke dimensions (3 cm wl WG Dual Mode 39mm inch tube) Phase center flush with WG opening Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx RHCP 52.5 outer 19 outer 39/42 copper tube T= 1.5 wall outer outer 1.0 mm bottom plate included Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Swedish EME-meeting May
141 Detail of WG / transformer and output section (3 cm wl WG Dual Mode 39mm inch tube) Phase center flush with WG opening 52.5 outer 39/42 brass /copper tube 19 outer 35.0 outer 1 mm overlap between tubes of transformer and wave guide and output section respectively. Transformer section made from 32/35 copper tube or turned from 40 mm solid brass stock to fit with WG and output section. If a tube is used, fittings between the transformer section and the wave guide and output section respectively need to be made from brass or Swedish EME-meeting May 2013 copper. 141
142 Septum dimensions (3 cm wl WG Dual Mode 39mm inch tube) Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Septum t = 1.0 mm copper 27.0 Inner measure Bottom plate not included 22.0 Bottom plate 1.0 mm brass Swedish EME-meeting May
143 Probe dimensions (3 cm wl WG Dual Mode 39mm inch tube) 1.4 diam inner Swedish EME-meeting May
144 InDish performance inch tube SM6FHZ 3 cm Dual Mode Feed Feed Radiation Pattern 0 db RHCP Total Dish diameter = 190 λ Feed diameter = 10 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, 2010 Swedish EME-meeting May
145 S11, S22, S21 combined (3 cm wl WG Dual Mode 39mm inch tube) SM6FHZ Name X Y m m m m m m S11, S22 & S21 combined SM6FHZ_septum_feed_coax_high_f_D_3_inch Curve Info db(s(txport,txport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(rxport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(txport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' Y m2 m4 m6 m m3 m Freq [GHz] Swedish EME-meeting May
146 3D Total Power Far Field pattern (3 cm wl WG Dual Mode 39mm inch tube) Swedish EME-meeting May
147 Far Field Pattern 0 deg (3 cm wl WG Dual Mode 39mm inch tube) SM6FHZ Directivity_Phi0 SM6FHZ_septum_feed_coax_high_f_D_3_inch Curve Info db(dirlhcp) Freq='10.368GHz' Phi='0deg' db(dirrhcp) Freq='10.368GHz' Phi='0deg' Y Theta [deg] Swedish EME-meeting May
148 Far Field Phase error (3 cm wl WG Dual Mode 39mm inch tube) SM6FHZ FF Phase error SM6FHZ_septum_feed_coax_high_f_D_3_inch Curve Info ang_deg(rephi) Freq='10.368GHz' Phi='0deg' Probe_pos='-65.9mm' ang_deg(retheta) Freq='10.368GHz' Phi='90deg' Probe_pos='-65.9mm' Y1 [deg] Theta [deg] Swedish EME-meeting May
149 SM6FHZ Cross Polar Ratio (3 cm wl WG Dual Mode 39mm inch tube) PolarizationRatio SM6FHZ_septum_feed_coax_high_f_D_3_inch Curve Info db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='0deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='45deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='90deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='135deg' db(polarizationratiocircularrhcp) Freq='10.368GHz' Phi='180deg' db(polarizationratiocircularrhcp) Theta [deg] Swedish EME-meeting May
150 Axial Ratio (3 cm wl WG Dual Mode 39mm inch tube) SM6FHZ AxialRatio SM6FHZ_septum_feed_coax_high_f_D_3_inch Curve Info Freq='10.368GHz' Phi='0deg' Freq='10.368GHz' Phi='45deg' Freq='10.368GHz' Phi='90deg' Freq='10.368GHz' Phi='135deg' Freq='10.368GHz' Phi='180deg' Theta [deg] Swedish EME-meeting May
151 SM6FHZ 3 cm 5 step septum feed for f/d ~ lambda W/G and a Dual Mode output section Using standard one inch brass / copper tubing and tube for choke
152 Solid and transparent models from the simulation (3 cm wl WG Dual Mode 39mm inch tubing) Swedish EME-meeting May
153 WG and choke dimensions (3 cm wl WG Dual Mode 39mm inch tubing) Phase center flush with WG opening Circular polarization convention for EME according to Crawford Hill Bulletin No 1: Tx RHCP in space Rx LHCP in space Take polarization reversal into account when using reflector antennas. Tx LHCP Rx RHCP 52.5 outer 19 outer /1.527 brass/copper tube (0.049 wall) T= 1.5 wall outer outer 1.0 mm bottom plate included Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Swedish EME-meeting May
154 Detail of WG / transformer and output section (3 cm wl WG Dual Mode 39mm inch tubing) Phase center flush with WG opening 52.5 outer /1.527 brass/copper tube (0.049 wall) 19 outer 35.0 outer 1 mm overlap between tubes of transformer and wave guide and output section respectively. Transformer section made from 32/35 copper tube or turned from 40 mm solid brass stock to fit with WG and output section. If a tube is used, fittings between the transformer section and the wave guide and output section respectively need to be made from brass or Swedish EME-meeting May 2013 copper. 154
155 Septum dimensions (3 cm wl WG Dual Mode 39mm inch tubing) Wave guide 1 /0.87 (0.065 wall) brass/copper tube (25.4/22.09 mm) Septum t = 1.0 mm copper 27.0 Inner measure Bottom plate not included 22.0 Bottom plate 1.0 mm brass Swedish EME-meeting May
156 Probe dimensions (3 cm wl WG Dual Mode 39mm inch tubing) 1.4 diam inner Swedish EME-meeting May
157 InDish performance inch tubing SM6FHZ 3 cm Dual Mode Feed Feed Radiation Pattern 0 db RHCP Total Dish diameter = 190 λ Feed diameter = 10 λ Parabolic Dish Efficiency % Feed Phase Angle E-plane H-plane Rotation Angle around specified Phase Center = λ beyond aperture MAX Possible Efficiency with XPOL loss & Phase error MAX Possible Efficiency with Phase error AFTER LOSSES: MAX Efficiency without phase error REAL WORLD at least 15% lower Illumination Spillover Feed Blockage 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db Parabolic Dish f/d W1GHZ 1998, 2010 Swedish EME-meeting May
158 S11, S22, S21 combined (3 cm wl WG Dual Mode 39mm inch tubing) SM6FHZ Name X Y m m m m m m S11, S22 & S21 combined SM6FHZ_septum_feed_coax_high_f_D_3_inch_inch Curve Info db(s(txport,txport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(rxport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' db(s(txport,rxport)) Setup1 : Sw eep Probe_pos='-65.9mm' Y m2 m4 m6 m m3 m Freq [GHz] Swedish EME-meeting May
159 3D Total Power Far Field pattern (3 cm wl WG Dual Mode 39mm inch tubing) Swedish EME-meeting May
A Novel 5 Step Septum Feed Suite
A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 SM6FHZ and SM6PGP Updated Post Conference Edition Outline Prerequisite Features Design criteria / considerations Wave Guides Septum Kumar choke,
More informationSeptum Feeds for 10 GHz EME. Swedish EME-meeting May 2015 SM6FHZ and SM6PGP
Septum Feeds for 10 GHz EME Swedish EME-meeting May 2015 SM6FHZ and SM6PGP Outline Prerequisite Features Design criteria / considerations (10 pages) Wave Guides Wave Guide interface Septum Kumar choke,
More informationComputer Optimized Dual Mode Circularly Polarized Feedhorn
Computer Optimized Dual Mode Circularly Polarized Feedhorn Marc Franco, N2UO 1 - Introduction This paper presents a high efficiency horn antenna intended to illuminate a passive parabolic reflector. The
More informationRA3AQ Septum Feed Simulations
RA3AQ Septum Feed Simulations Paul Wade W1GHZ 2008 w1ghz@arrl.net Dmitri, RA3AQ developed a feed in 2007 with a square septum and a round aperture, and updated it in late 2008. I received this drawing
More informationReflector antennas and their feeds
Reflector antennas and their feeds P. Hazdra, M. Mazanek,. hazdrap@fel.cvut.cz Department of Electromagnetic Field Czech Technical University in Prague, FEE www.elmag.org v. 23.4.2015 Outline Simple reflector
More informationW1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ
Section 6.0 Introduction Chapter 6 Feeds for Parabolic Dish Antennas Paul Wade 1994,1997,1998,1999 The key to good parabolic dish antenna performance is the feed antenna, the source of radiated energy
More informationDual Band Feedhorns for 2304/3456 MHz and 5760/10368 MHz
Dual Band Feedhorns for 2304/3456 MHz and 5760/10368 MHz by Al Ward WB5LUA Microwave Update 97 Sandusky, Ohio Background Numerous articles have been written by WA9HUV, VE4MA, N1BWT and others on the proper
More informationCircular Polarization Feed for Space Communication on the 3 cm Band
Circular Polarization Feed for Space Communication on the 3 cm Band Part 2 Rastislav Galuscak 1 - OM6AA, Bert Modderman - PE1RKI, Vladimir Masek - OK1DAK, Pavel Hazdra 1,Milos Mazanek 1, Jeffrey Pawlan
More informationDesign and Simulation of Flat Scalar Ring Feed Horn Antenna using HFSS for Wide Band Ground Station Receiver Applications
Design and Simulation of Flat Scalar Ring Feed Horn Antenna using HFSS for Wide Band Ground Station Receiver Applications P.Nandakumar 1, M. Durga Rao 2 M.Tech Student, Dept.of ECE, SVUCE, SV University,
More informationDesign of a prime-focus feed with backward radiation
Design of a prime-focus feed with backward radiation Libor SLÁMA 1, Rastislav GALUŠČÁK - OM6AA 1, Pavel HAZDRA 1 1 Dept. of Electromagnetic Field, Czech Technical University, Technická 2, 166 27 Praha,
More informationChapter 5 DESIGN AND IMPLEMENTATION OF SWASTIKA-SHAPED FREQUENCY RECONFIGURABLE ANTENNA ON FR4 SUBSTRATE
Chapter 5 DESIGN AND IMPLEMENTATION OF SWASTIKA-SHAPED FREQUENCY RECONFIGURABLE ANTENNA ON FR4 SUBSTRATE The same geometrical shape of the Swastika as developed in previous chapter has been implemented
More informationThe Rise and Rise of 6cm EME. Peter Blair G3LTF
The Rise and Rise of 6cm EME Peter Blair G3LTF The Rise and Rise of 6cm EME G3LTF EME a brief history Why 6cm EME? Some 6cm issues Current Systems, Dishes and Feeds Transverters, LNAs and Transmitters
More informationA Novel approach for Stacked Patch antenna for large bandwidth applications
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 2320-3331, Volume 9, Issue 2 Ver. II (Mar Apr. 2014), PP 88-93 A Novel approach for Stacked Patch antenna for
More informationW1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ
Online Online Online Online Online Online (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) Online (ex-n1bwt) W1GHZ W1GHZ Microwave Antenna Book Antenna BookOnline W1GHZ W1GHZ
More informationMICROSTRIP PATCH RADIATING ELEMENTS FOR CIRCULARLY- POLARIZED PHASED ARRAY
MICROSTRIP PATCH RADIATING ELEMENTS FOR CIRCULARLY- POLARIZED PHASED ARRAY ABSTRACT Paul G. Elliot and Mohamed S. Mahmoud 1 MITRE Corporation, Bedford, MA, 173 USA pelliot@mitre.org This report evaluates
More informationAperture Antennas. Reflectors, horns. High Gain Nearly real input impedance. Huygens Principle
Antennas 97 Aperture Antennas Reflectors, horns. High Gain Nearly real input impedance Huygens Principle Each point of a wave front is a secondary source of spherical waves. 97 Antennas 98 Equivalence
More informationDesign of a Novel Compact Cup Feed for Parabolic Reflector Antennas
Progress In Electromagnetics Research Letters, Vol. 64, 81 86, 2016 Design of a Novel Compact Cup Feed for Parabolic Reflector Antennas Amir Moallemizadeh 1,R.Saraf-Shirazi 2, and Mohammad Bod 2, * Abstract
More informationCircular Polarization and Polarization Losses
Circular Polarization and Polarization Losses by Rastislav Galuscak - OM6AA, Pavel Hazdra (1), (1) CTU Prague, FEE, Dept. of Electromagnetic Field, Technicka 2, 166 27, Prague, Czech Republic, E-mail:,
More informationCIRCULARLY POLARIZED PATCH ANTENNA WITH A STACKED SLOT-RING
Progress In Electromagnetics Research Letters, Vol. 36, 163 170, 2013 CIRCULARLY POLARIZED PATCH ANTENNA WITH A STACKED SLOT-RING The-Nan Chang 1, * and Jyun-Ming Lin 2 1 Department of Electrical Engineering,
More informationHIGH GAIN AND LOW COST ELECTROMAGNETICALLY COUPLED RECTAGULAR PATCH ANTENNA
HIGH GAIN AND LOW COST ELECTROMAGNETICALLY COUPLED RECTAGULAR PATCH ANTENNA Raja Namdeo, Sunil Kumar Singh Abstract: This paper present high gain and wideband electromagnetically coupled patch antenna.
More informationRECONFIGURABLE PATCH AND GROUND PLANE MICROSTRIP ANTENNA TO ENHANCING BANDWIDTH
RECONFIGURABLE PATCH AND GROUND PLANE MICROSTRIP ANTENNA TO ENHANCING BANDWIDTH Ahmad H. Abood Al-Shaheen Physics Department, College of Science, Misan University, Iraq E-Mail: prof.dr.ahmad@uomisan.edu.iq
More informationSimulation of Plasma Antenna Parameters
www.ijetmas.com May 216, Volume 4, Issue 5, ISSN 2349-4476 Simulation of Plasma Antenna Parameters Prince Kumar and Rajneesh Kumar Department of Physics, Dr. H S. Gour Central University, Sagar (M. P),
More informationChapter 5. Array of Star Spirals
Chapter 5. Array of Star Spirals The star spiral was introduced in the previous chapter and it compared well with the circular Archimedean spiral. This chapter will examine the star spiral in an array
More informationA NEW TECHNIQUE FOR CONSTRUCTION OF 23CM SEPTUM FEED June 18, 2010 (Revised November 15, 2017)
INTRODUCTION 1296 MHz EME popularity is growing this band seems to be the big attraction these days. Just acquire an old TVRO dish and you are on your way. This article will hopefully at least make the
More informationHigh-Performance Dual-Circularly Polarized Reflector Antenna Feed
High-Performance Dual-Circularly Polarized Reflector Antenna Feed Joo-Young Lim, Jargalsaikhan Nyambayar, Je-Young Yun, Dong-Hyun Kim, Tae-Hyung Kim, Bierng-Chearl Ahn, and Jae-Hoon Bang This paper presents
More informationExperimental Investigation of Quadrifilar Helix Antennas for 2400 MHz
ANTENNAS Experimental Investigation of Quadrifilar Helix Antennas for 2400 MHz by Domenico Marini, I8CVS This article first appeared in the AMSAT-DL Journal. Translated by Reinhard Richter, DJ1KM. Translated
More informationVK3UM Impedance Calculator. Table of Contents
Table of Contents Concentric Tube Ratio 3 Centered Strip Line 5 Quarter Wave transition. 6 Coaxial Lengths 7 VSWR Calculator. 8 Dish Reflection Coefficient 10 Convert Fractions to a decimal value. 12 Author
More informationTRANSMITTING ANTENNA WITH DUAL CIRCULAR POLARISATION FOR INDOOR ANTENNA MEASUREMENT RANGE
TRANSMITTING ANTENNA WITH DUAL CIRCULAR POLARISATION FOR INDOOR ANTENNA MEASUREMENT RANGE Michal Mrnka, Jan Vélim Doctoral Degree Programme (2), FEEC BUT E-mail: xmrnka01@stud.feec.vutbr.cz, velim@phd.feec.vutbr.cz
More information6.9.6 Dual-band feed experiments
6.9.6 Dual-band feed experiments I was impressed with the performance of the dual-band feeds for 10 and 24 GHz; I hypothesized that the wider frequency separation might provide better results than the
More informationAntenna Design Process with Examples
Antenna Design Process with Examples Tchanguiz RAZBAN Tomsk December 2017 1 / 19 0 Presentation of IETR (our Lab) 1 2 Wide Band Dual-Polarized Antenna Satellite Receiver Antenna 3 Transparent Antenna 4
More informationSEPTUM HORN ANTENNAS AT 47/48 GHz FOR HIGH ALTITUDE PLATFORM STATIONS
SEPTUM HORN ANTENNAS AT 47/48 GHz FOR HIGH ALTITUDE PLATFORM STATIONS Z. Hradecky, P. Pechac, M. Mazanek, R. Galuscak CTU Prague, FEE, Dept. of Electromagnetic Field, Technicka 2, 166 27 Prague, Czech
More informationIntroduction to Radar Systems. Radar Antennas. MIT Lincoln Laboratory. Radar Antennas - 1 PRH 6/18/02
Introduction to Radar Systems Radar Antennas Radar Antennas - 1 Disclaimer of Endorsement and Liability The video courseware and accompanying viewgraphs presented on this server were prepared as an account
More informationBroadband Spiral Antenna
Our OBS series cavity backed spirals are broadband antennas designed for ECM, surveillance, direction finding, telemetry, and flush mounted airborne applications. These spirals can be used as a separate
More informationFirst-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader
Progress In Electromagnetics Research Letters, Vol. 77, 89 96, 218 First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader Xiuhui Yang 1, Quanyuan
More informationW1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ
Online Online Online Online Online Online (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) Online (ex-n1bwt) W1GHZ W1GHZ Microwave Antenna Book Antenna BookOnline W1GHZ W1GHZ
More informationNovel Dual-Polarized Spiral Antenna
Quantum Reversal Inc. White Paper, ALL RIGHTS RESERVED 1 Novel Dual-Polarized Spiral Antenna W. Kunysz, Senior Member Abstract A novel multi-arm (N-arm) spiral antenna that provides flexibe in control
More informationOPTIMIZATION OF PRIME-FOCUS CIRCULAR WAVEGUIDE FEED WITH SEPTUM POLARIZATION TRANSFORMER FOR GHZ EME STATION
OPTIMIZATION OF PRIME-FOCUS CIRCULAR WAVEGUIDE FEED WITH SEPTUM POLARIZATION TRANSFORMER FOR 1.296 GHZ EME STATION Pavel Hazdra (1), Rastislav Galuscak (1), Milos Mazanek (1) (1) CTU Prague, FEE, Dept.
More informationMicrostrip Antennas Integrated with Horn Antennas
53 Microstrip Antennas Integrated with Horn Antennas Girish Kumar *1, K. P. Ray 2 and Amit A. Deshmukh 1 1. Department of Electrical Engineering, I.I.T. Bombay, Powai, Mumbai 400 076, India Phone: 91 22
More information2.3GHz Dish Feed Antenna
I have not been convinced my very old 2.3GHz 44 element Loop Yagi has been working as well as it should do, particularly as the elements have become severely corroded over the years. I decided to see if
More informationStudy of the Effect of Substrate Materials on the Performance of UWB Antenna
International Journal of Computational Engineering Research Vol, 03 Issue, 4 Study of the Effect of Substrate Materials on the Performance of UWB Antenna 1 D.Ujwala, 2 D.S.Ramkiran, 3 N.Brahmani, 3 D.Sandhyarani,
More informationDesign of Tri-frequency Mode Transducer
78 Design of Tri-frequency Mode Transducer V. K. Singh, S. B. Chakrabarty Microwave Sensors Antenna Division, Antenna Systems Area, Space Applications Centre, Indian Space Research Organization, Ahmedabad-3815,
More informationPhased Array Feed (PAF) Design for the LOVELL Antenna based on the Octagonal Ring Antenna (ORA) Array
Phased Array Feed (PAF) Design for the LOVELL Antenna based on the Octagonal Ring Antenna (ORA) Array M. Yang, D. Zhang, L. Danoon and A. K. Brown, School of Electrical and Electronic Engineering The University
More informationTransmitarrays, reflectarrays and phase shifters for wireless communication systems. Pablo Padilla de la Torre Universidad de Granada
Transmitarrays, reflectarrays and phase shifters for wireless communication systems Pablo Padilla de la Torre Universidad de Granada Outline 1. Introduction to Transmitarray and Reflectarray structures
More informationMulti-functional miniaturized slot antenna system for small satellites
Multi-functional miniaturized slot antenna system for small satellites Jose Padilla, Frederic Bongard, Stefano Vaccaro (JAST SA, a ViaSat company) Gabriele Rosati, Juan Mosig (LEMA-EPFL) Anton Ivanov (Space
More informationGPS Active Antenna With GPRS Measurement Report
GPS Active Antenna With GPRS Measurement Report Summary: This report is to account for the measurement setup and results of 4x23mm and mm height GPS active antenna combined with GPRS antenna measurement.
More informationCIRCULARLY POLARIZED SLOTTED APERTURE ANTENNA WITH COPLANAR WAVEGUIDE FED FOR BROADBAND APPLICATIONS
Journal of Engineering Science and Technology Vol. 11, No. 2 (2016) 267-277 School of Engineering, Taylor s University CIRCULARLY POLARIZED SLOTTED APERTURE ANTENNA WITH COPLANAR WAVEGUIDE FED FOR BROADBAND
More informationTechnical Note
3D RECOflO C Technical Note 1967-47 A. Sotiropoulos X-Band Cylindrical Lens Antenna 26 October 1967 Lincoln Laboratory MAS TTS INSTITUTE OF TECHNOLOGY m Lexington, Massachusetts The work reported in.this
More informationDesign and realization of tracking feed antenna system
Design and realization of tracking feed antenna system S. H. Mohseni Armaki 1, F. Hojat Kashani 1, J. R. Mohassel 2, and M. Naser-Moghadasi 3a) 1 Electrical engineering faculty, Iran University of science
More information6.1.5 Dish Patterns with Axial Displacement Error
6.1.5 Dish Patterns with Axial Displacement Error When I first talked about axial displacement error, one of the first questions that arose was Where does the power go when the gain is reduced? The best
More informationCHAPTER 2 MICROSTRIP REFLECTARRAY ANTENNA AND PERFORMANCE EVALUATION
43 CHAPTER 2 MICROSTRIP REFLECTARRAY ANTENNA AND PERFORMANCE EVALUATION 2.1 INTRODUCTION This work begins with design of reflectarrays with conventional patches as unit cells for operation at Ku Band in
More informationGPS Patch Antenna Considerations. Advanced Material On TECHnology
GPS Patch Antenna Considerations Advanced Material On TECHnology Contents Antenna Element Impedance and Resonant Frequency Axial Ratio Voltage Standing Wave Ratio (VSWR) Bandwidth Result of Measurement
More information47 GHz Waveguide Harmonic Mixer
47 GHz Waveguide Harmonic Mixer These slides present an evolution of harmonic mixer construction ideas. The first slides depict the first harmonic mixer construction details and the later slides depict
More informationL-Band and X-Band Antenna Design and Development for NeXtRAD
L-Band and X-Band Antenna Design and Development for NeXtRAD S. T. Paine, P. Cheng, D. W. O Hagan, M. R. Inggs, H. D. Griffiths* Department of Electrical Engineering Radar Remote Sensing Group University
More informationWho We Are. Antennas Space Terahertz
Anteral Products Who We Are Anteral was born in 2011 as a spin-off of the Public University of Navarra (UPNA) Antenna Group. It is a technological company with an innovative profile. Anteral is focused
More informationCOMPUTED ENVELOPE LINEARITY OF SEVERAL FM BROADCAST ANTENNA ARRAYS
COMPUTED ENVELOPE LINEARITY OF SEVERAL FM BROADCAST ANTENNA ARRAYS J. DANE JUBERA JAMPRO ANTENNAS, INC PRESENTED AT THE 28 NAB ENGINEERING CONFERENCE APRIL 16, 28 LAS VEGAS, NV COMPUTED ENVELOPE LINEARITY
More informationKeywords Cross-polarization, phasing length, return loss, multimode horn
Volume 4, Issue, February 014 ISSN: 18X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Cross Polarization Reduction
More information14 Sept 2006 Page 1 of 11 TRF7960 RFID Reader & Antenna Circuits. 1.) Introduction
14 Sept 2006 Page 1 of 11 TRF7960 RFID Reader & Antenna Circuits 1.) Introduction This paper describes the design method for determining an antenna matching circuit together with Tx and Rx interface circuits
More informationDesign & Analysis of a Modified Circular Microstrip Patch Antenna with Circular Polarization and Harmonic Suppression
Design & Analysis of a Modified Circular Microstrip Patch Antenna with Circular Polarization and Harmonic Suppression Lokesh K. Sadrani 1, Poonam Sinha 2 PG Student (MMW), Dept. of ECE, UIT Barkatullah
More informationBroadband and High Efficiency Single-Layer Reflectarray Using Circular Ring Attached Two Sets of Phase-Delay Lines
Progress In Electromagnetics Research M, Vol. 66, 193 202, 2018 Broadband and High Efficiency Single-Layer Reflectarray Using Circular Ring Attached Two Sets of Phase-Delay Lines Fei Xue 1, *, Hongjian
More informationReflector Antenna, its Mount and Microwave. Absorbers for IIP Radiometer Experiments
Reflector Antenna, its Mount and Microwave Absorbers for IIP Radiometer Experiments Nakasit Niltawach, and Joel T. Johnson May 8 th, 2003 1 Introduction As mentioned in [1], measurements are required for
More informationShortened 3D Corner Reflector Antenna Dragoslav Dobričić, YU1AW
Shortened 3D Corner Reflector Antenna Dragoslav Dobričić, YU1AW Abstract In this text two 3D corner reflector antenna modifications are described. The first modification is regarding the input impedance
More informationComparative Analysis of Microstrip Rectangular Patch Antenna with Different Feeding Techniques using HFSS
Mody University International Journal of Computing and Engineering Research Vol. 1 Issue 1, 2017, pp.34-42 ISSN: 2456-9607 (Print) 2456-8333(Online) Comparative Analysis of Microstrip Rectangular Patch
More informationDesign Approach of a Wideband Frequency Tunable Triangular Patch Array with Concurrent Polarization Alteration
Design Approach of a Wideband Frequency Tunable Triangular Patch Array with Concurrent Polarization Alteration Biswajit Dwivedy 1 and Santanu Kumar Behera 2 Department of Electronics and Communication
More informationDesign of helical antenna using 4NEC2
Design of helical antenna using 4NEC2 Lakshmi Kumar 1, Nilay Reddy. K 2, Suprabath. K 3, Puthanial. M 4 Saveetha School of Engineering, Saveetha University, lakshmi.kmr1@gmail.com 1 Abstract an antenna
More informationWIESON TECHNOLOGIES CO., LTD.
WIESON 3D CHAMBER TEST REPORT G121HT632-1 Page 1 of 2 I. Summary: This report to account for the measurement setup and result of the Antenna. The measurement setup includes s-parameter, pattern, and gain
More informationDesign and Analysis of a Reflector Antenna System Based on Doubly Curved Circular Polarization Selective Surfaces
Design and Analysis of a Reflector Antenna System Based on Doubly Curved Circular Polarization Selective Surfaces C. Cappellin 1, D. Sjöberg 2, A. Ericsson 2, P. Balling 3, G. Gerini 4,5, N. J. G.Fonseca
More informationSimulation and Measurement of the Effects of Reflections from a Prime Focus Dish back into a Circularly Polarized Feed
Simulation and Measurement of the Effects of Reflections from a Prime Focus Dish back into a Circularly Polarized Feed By Jeffrey Pawlan - WA6KBL, Pawlan Communications, and Rastislav Galušcák - OM6AA,
More informationRECTANGULAR MICROSTRIP PATCH ANTENNA ON LIQUID CRYSTAL POLYMER SUBSTRATE
RECTANGULAR MICROSTRIP PATCH ANTENNA ON LIQUID CRYSTAL POLYMER SUBSTRATE B.T.P.MADHAV, PROF. VGKM PISIPATI, K V L BHAVANI, P.SREEKANTH, P. RAKESH KUMAR LCRC-R&D, K L UNIVERSITY, VADDESWARAM, GUNTUR DT,
More informationSpecifications Sheet: PRIME FOCUS MESH DISH KIT 1.2 Meter DISH
Specifications Sheet: PRIME FOCUS MESH DISH KIT 1.2 Meter DISH Available F/D: 0.35 / 0.4 / 0.45 / 0.5 (Example Picture: 1.2 Meter dish (6mm mesh) 1M2_KIT_SPEC RF HAMDESIGN www.rfhamdesign.com This 8-Rib
More informationANTENNA INTRODUCTION / BASICS
ANTENNA INTRODUCTION / BASICS RULES OF THUMB: 1. The Gain of an antenna with losses is given by: 2. Gain of rectangular X-Band Aperture G = 1.4 LW L = length of aperture in cm Where: W = width of aperture
More informationThe Basics of Patch Antennas, Updated
The Basics of Patch Antennas, Updated By D. Orban and G.J.K. Moernaut, Orban Microwave Products www.orbanmicrowave.com Introduction This article introduces the basic concepts of patch antennas. We use
More information"(c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/
"(c) 17 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes,
More informationBroadband Circular Polarized Antenna Loaded with AMC Structure
Progress In Electromagnetics Research Letters, Vol. 76, 113 119, 2018 Broadband Circular Polarized Antenna Loaded with AMC Structure Yi Ren, Xiaofei Guo *,andchaoyili Abstract In this paper, a novel broadband
More informationDesign and Implementation of Quasi Planar K-Band Array Antenna Based on Travelling Wave Structures
Design and Implementation of Quasi Planar K-Band Array Antenna Based on Travelling Wave Structures Zunnurain Ahmad This thesis is presented as part of Degree of Master of Science in Electrical Engineering
More informationTOPIC 2 WAVEGUIDE AND COMPONENTS
TOPIC 2 WAVEGUIDE AND COMPONENTS COURSE LEARNING OUTCOME (CLO) CLO1 Explain clearly the generation of microwave, the effects of microwave radiation and the propagation of electromagnetic in a waveguide
More informationAntenna Engineering Lecture 3: Basic Antenna Parameters
Antenna Engineering Lecture 3: Basic Antenna Parameters ELC 405a Fall 2011 Department of Electronics and Communications Engineering Faculty of Engineering Cairo University 2 Outline 1 Radiation Pattern
More informationBasic Microwave Antennas - Utility-Driven Tradeoff Analysis. Tom Haddon, K5VH
Basic Microwave Antennas - Utility-Driven Tradeoff Analysis Tom Haddon, K5VH So, You Want to Get On the Microwave Bands? What Antenna? How do I Decide? Build or Buy? Cost? How Hard to Install? How Good?
More informationThe magnetic surface current density is defined in terms of the electric field at an aperture as follows: 2E n (6.1)
Chapter 6. Aperture antennas Antennas where radiation occurs from an open aperture are called aperture antennas. xamples include slot antennas, open-ended waveguides, rectangular and circular horn antennas,
More informationA Fan-Shaped Circularly Polarized Patch Antenna for UMTS Band
Progress In Electromagnetics Research C, Vol. 52, 101 107, 2014 A Fan-Shaped Circularly Polarized Patch Antenna for UMTS Band Sumitha Mathew, Ramachandran Anitha, Thazhe K. Roshna, Chakkanattu M. Nijas,
More informationPerformance Analysis of a Patch Antenna Array Feed For A Satellite C-Band Dish Antenna
Cyber Journals: Multidisciplinary Journals in Science and Technology, Journal of Selected Areas in Telecommunications (JSAT), November Edition, 2011 Performance Analysis of a Patch Antenna Array Feed For
More information4.4. Experimental Results and Analysis
4.4. Experimental Results and Analysis 4.4.1 Measurement of the IFA Against a Large Ground Plane The Inverted-F Antenna (IFA) discussed in Section 4.3.1 was modeled over an infinite ground plane using
More informationPRODUCT CATALOG MICROWAVE & MILLIMETER WAVE COMPONENTS & SUB-ASSEMBLIES 5 TO 325 GHZ
PRODUCT CATALOG MICROWAVE & MILLIMETER WAVE COMPONENTS & SUB-ASSEMBLIES AMPLIFIERS ANTENNAS CONTROL COMPONENTS UP/DOWN CONVERTERS FERRITE COMPONENTS WAVEGUIDE COMPONENTS SUB-ASSEMBLIES GUNN OSCILLATORS
More informationRECONFIGURABLE MAGNETOHYDRODYANAMIC ANTENNA
RECONFIGURABLE MAGNETOHYDRODYANAMIC ANTENNA LITERATURE SURVEY RECONFIGURABLE ANTENNA It was first introduced in 1998 by E.R Brown The most common techniques utilized in designing reconfigurable antenna
More informationessential requirements is to achieve very high cross-polarization discrimination over a
INTRODUCTION CHAPTER-1 1.1 BACKGROUND The antennas used for specific applications in satellite communications, remote sensing, radar and radio astronomy have several special requirements. One of the essential
More informationSimulation Results of Circular Horn Antenna
Simulation Results of Circular Horn Antenna Mahendra Singh Meena 1, Ved Prakash 2 1Assistant Professor, Amity University Haryana, Panchgaon, Manesar, Gurgaon, Haryana, India 2Ved Prakash, Amity University
More informationMICROWAVE MICROWAVE TRAINING BENCH COMPONENT SPECIFICATIONS:
Microwave section consists of Basic Microwave Training Bench, Advance Microwave Training Bench and Microwave Communication Training System. Microwave Training System is used to study all the concepts of
More informationChapter 41 Deep Space Station 13: Venus
Chapter 41 Deep Space Station 13: Venus The Venus site began operation in Goldstone, California, in 1962 as the Deep Space Network (DSN) research and development (R&D) station and is named for its first
More informationEvaluation of Suitable Feed Systemes
Evaluation of Suitable Feed Systemes Review of the Ring Focus Antenna Quadridge Horn Eleven Feed Coaxial Horn and Multiband Corrugated Horn Conclusion MIRAD Microwave AG Broadband Feedsystems IVS VLBI21
More informationA DUAL-PORTED PROBE FOR PLANAR NEAR-FIELD MEASUREMENTS
A DUAL-PORTED PROBE FOR PLANAR NEAR-FIELD MEASUREMENTS W. Keith Dishman, Doren W. Hess, and A. Renee Koster ABSTRACT A dual-linearly polarized probe developed for use in planar near-field antenna measurements
More informationW1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ
Online Online Online Online Online Online (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) Online (ex-n1bwt) W1GHZ W1GHZ Microwave Antenna Book Antenna BookOnline W1GHZ W1GHZ
More informationLow-Profile Wideband Circularly Polarized Patch Antenna Using Asymmetric Feeding
Progress In Electromagnetics Research Letters, Vol. 48, 21 26, 2014 Low-Profile Wideband Circularly Polarized Patch Antenna Using Asymmetric Feeding Yang-Tao Wan *, Fu-Shun Zhang, Dan Yu, Wen-Feng Chen,
More informationNEW DESIGN OF COMPACT SHORTED ANNULAR STACKED PATCH ANTENNA FOR GLOBAL NAVIGA- TION SATELLITE SYSTEM APPLICATION
Progress In Electromagnetics Research C, Vol. 36, 223 232, 213 NEW DESIGN OF COMPACT SHORTED ANNULAR STACKED PATCH ANTENNA FOR GLOBAL NAVIGA- TION SATELLITE SYSTEM APPLICATION Xi Li *, Lin Yang, and Min
More informationRAYTHEON 23 x 22 50GHZ PULSE SYSTEM
RAYTHEON 23 x 22 50GHZ PULSE SYSTEM Terry Speicher Nearfield Systems, Incorporated 1330 E. 223 rd Street, Bldg. 524 Carson, CA 90745 www.nearfield.com Angelo Puzella and Joseph K. Mulcahey Raytheon Electronic
More informationThe Future: Ultra Wide Band Feeds and Focal Plane Arrays
The Future: Ultra Wide Band Feeds and Focal Plane Arrays Germán Cortés-Medellín NAIC Cornell University 1-1 Overview Chalmers Feed Characterization of Chalmers Feed at Arecibo Focal Plane Arrays for Arecibo
More informationStudy and Analysis of Microstrip Patch Array at 12 GHz for 5G Applications
Study and Analysis of Microstrip Patch Array at 12 GHz for 5G Applications Kirankumar A. Solanki Sankalchand Patel collage of Engineering, Visnagar, Gujarat, India e-mail: solankikiran233@gmail.com Gautam
More informationDouble-Ridged Waveguide Horn
Model 3106 200 MHz 2 GHz Uniform Gain Power Handling up to 1.6 kw Model 3115 1 GHz 18 GHz Low VSWR Model 3116 18 GHz 40 GHz Quality Construction M O D E L 3 1 0 6 Double-Ridged Waveguide Horn PROVIDING
More informationThe Revival of 9cm EME
The Revival of 9cm EME The first 9cm eme contact was in April 1987 Low and sporadic activity since that time Different frequency allocations around the world Use or Lose! The Answer...Organise an Activity
More informationSINGLE-FEEDING CIRCULARLY POLARIZED TM 21 - MODE ANNULAR-RING MICROSTRIP ANTENNA FOR MOBILE SATELLITE COMMUNICATION
Progress In Electromagnetics Research Letters, Vol. 20, 147 156, 2011 SINGLE-FEEDING CIRCULARLY POLARIZED TM 21 - MODE ANNULAR-RING MICROSTRIP ANTENNA FOR MOBILE SATELLITE COMMUNICATION X. Chen, G. Fu,
More informationCost Effective Dual Band Short Backfire Antenna
International Journal of Electrical & Computer Sciences IJECS-IJENS Vol:9 No:09 30 Cost Effective Dual Band Short Backfire Antenna M. Javid Asad and M. Zafrullah Abstract-- Short backfire antennas have
More informationThe VK3UM Radiation and System Performance Calculator
The VK3UM Radiation and System Performance Calculator 1. Disclaimer... 2 2. Background... 2 3. Calculations... 2 4. Features... 2 5. Default Parameters... 3 6. Parameter Description... 4 7. On Axis Exclusion
More information