A Novel 5 Step Septum Feed Suite

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