Interference Mitigation Using a Multiple Feed Array for Radio Astronomy
|
|
- Diane Warren
- 6 years ago
- Views:
Transcription
1 Interference Mitigation Using a Multiple Feed Array for Radio Astronomy Chad Hansen, Karl F Warnick, and Brian D Jeffs Department of Electrical and Computer Engineering Brigham Young University Provo, UT J Richard Fisher and Richard Bradley National Radio Astronomy Observatory Green Bank, West Virginia July 13, 2004
2 RFI Mitigation Techniques: Spatial filtering Requires multiple spatially separated looks at interferer Adaptive cancellation Time blanking
3 Array Feed - Design Goals High Sensitivity Sensitivity = Gain System Temperature ~ SNR T sys =T receiver + T spillover + T Interference + T atmosphere +T cmb Beam steering Beam shape control Gain stability RFI Mitigation
4 Previous Work: Array Feeds Most implementations: 1 feed = 1 beam eg: Parkes HIPASS Array Multibeam feed
5 19-element Array at NRAO Electrically small elements Hexagonal array Beamforming
6 Approach 25 meter paraboloid GRASP8 (TICRA) PTD reflector analysis software Array weights three methods: Conjugate field match (CFM) Brute force sensitivity optimization Max SNR/LCMV (beamforming + RFI nulling) Compare to single waveguide feed
7 Assumptions Array: Operating frequency: 1612 MHz 7 and 19-element hexagonal arrays with 06λ spacing Hertzian dipoles No mutual coupling between array elements Hemispherical element patterns Noise model: Individual LNA noise temperature: 15 K Spillover noise: 300K warm ground below reflector Atmospheric and cosmic background noise is neglected
8 Interference Mitigation s[n] max-snr/lcmv x 1 [n] x 2 [n] x N [n] w 1 w 2 y[n] w N Spillover noise
9 Sensitivity 25 meter reflector Boresight beam 10 x Array feed (optimum) Array feed (CFM) Waveguide feed Sensitivity (Jy 1 ) Feed Displacement (wavelengths) closer to reflector further from reflector
10 Gain and Spillover Efficiency Array feed (optimum) Array feed (CFM) Waveguide feed Array feed (optimum) Array feed (CFM) Waveguide feed Gain (dbi) Feed Displacement (wavelengths) Spillover Efficiency (%) Feed Displacement (wavelengths)
11 Reflector Illumination Pattern 10 Array feed (optimum) Waveguide feed 0 Gain (dbi) Degrees from Boresight
12 Steered Beams/Offset Feed Sensitivity (Jy 1 ) 12 x Array feed, focal plane Array feed, 25 wavelengths Array feed, +15 wavelengths Array feed, +25 wavelengths Array feed, CFM Waveguide feed Degrees from Boresight
13 Focal Field Distribution Boresight Beam steered to db 0 25 db λ λ
14 Results (7 Element Array) Interferer at 30 degrees, INR=0 db Sens eff =00073 Jy 1 Spillover eficiency=971 % Gain=493 dbi Sens eff =00073 Jy 1 Spillover eficiency=971 % Gain=493 dbi Gain (dbi) 0 20 Gain (dbi) Degrees from Boresight Degrees from Boresight
15 Main Beam Distortion Sens =00073 Jy 1 eff 50 Spillover eficiency=971 % Gain=493 dbi Gain (dbi) Degrees from Boresight Distored Beampattern with Interference Normal Beampattern with no Interference
16 Interferer at 30 deg, INR In changing 8 x 10 3 Array feed (max SNR) Waveguide feed Effective Sensitivity (Jy 1 ) INR In (db)
17 Moving Interferer 9 x Effective Sensitivity (Jy 1 ) Degrees from Boresight
18 Interference Rejection Interference Rejection (db) Degrees from Boresight - Low sensitivity corresponds to poor spillover efficiency and gain loss
19 Signal/Interferer Array Responses Angle cosine between interferer and signal response vectors Sensitivity decreases when responses are similar Sensitivity loss is a grating lobe-like effect cosψ Degrees from Boresight
20 19-element array, moving interferer Effective Sensitivity (Jy 1 ) element array feed 19 element array feed Theoretical maximum Degrees from Boresight
21 Conclusions Good sensitivity can be achieved using an array feed In the presence of an interferer Interference at all INR levels and all angles was effectively rejected Main beam distortion occurs due to beam steering/rfi mitigation Sensitivity fluctuates by a few db with moving angle of arrival Future work: Algorithms: beam shape control, defocusing (larger arrays)? Broadband elements Mutual coupling Prototype
22 Gain and Spillover Efficiency Gain (dbi) Array feed, focal plane 42 Array feed, 25 wavelengths Array feed, +15 wavelengths 40 Array feed, +25 wavelengths Array feed, CFM Waveguide feed Degrees from Boresight 08 1 Spillover Efficiency (%) Array feed, focal plane Array feed, 25 wavelengths Array feed, +15 wavelengths Array feed, +25 wavelengths Array feed, CFM Waveguide feed Degrees from Boresight
23 Multiple Beams θ=3 θ-cut Gain(dBi) Gain(dBi) Phi Degrees from Boresight
24 Sensitivity x 10 3 Sensitivity (Jy 1 ) Beam 5 6 7
25 Sum of outer weights Effective Sensitivity (Jy 1 ) Sum of amplitudes of outer six element weights
26 Center element, INR IN INR IN (db) Degrees from Boresight
27 Assumptions 15 K W 1 LNA 15 K W 1 W 2 15 K W 2 15 K W N G S = T rec + T spill T = (W ) rec W N N i= 1 i 2 T i
Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for Radio Astronomy
Brigham Young University BYU ScholarsArchive All Theses and Dissertations 2004-03-03 Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for Radio Astronomy Chad K. Hansen Brigham
More informationActive Impedance Matched Dual-Polarization Phased Array Feed for the GBT
Active Impedance Matched Dual-Polarization Phased Array Feed for the GBT Karl F. Warnick, David Carter, Taylor Webb, Brian D. Jeffs Department of Electrical and Computer Engineering Brigham Young University,
More informationExperimental Verification of RFI Mitigation with a Focal Plane Array Feed
Radio Science, Volume???, Number, Pages 1 8, Experimental Verification of RFI Mitigation with a Focal Plane Array Feed James R. Nagel 1 Lockheed Martin, Inc. Vandenberg Air Force Base, CA 93437 Karl F.
More informationExperimental verification of radio frequency interference mitigation with a focal plane array feed
RADIO SCIENCE, VOL. 42,, doi:10.1029/2007rs003630, 2007 Experimental verification of radio frequency interference mitigation with a focal plane array feed James R. Nagel, 1 Karl F. Warnick, 2 Brian D.
More informationEfficiencies and System Temperature for a Beamforming Array
Brigham Young University BYU ScholarsArchive All Faculty Publications 28-6- Efficiencies and System Temperature for a Beamforming Array Karl F. Warnick warnick@byu.edu Brian D. Jeffs bjeffs@ee.byu.edu
More informationPhased Array Feeds & Primary Beams
Phased Array Feeds & Primary Beams Aidan Hotan ASKAP Deputy Project Scientist 3 rd October 2014 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of parabolic (dish) antennas. Focal plane response to a
More informationSignal Processing for Phased Array Feeds in Radio Astronomical Telescopes
Signal Processing for Phased Array Feeds in Radio Astronomical Telescopes Brian D. Jeffs, Senior Member, IEEE, Karl F. Warnick Senior Member, IEEE, Jonathan Landon, Jacob Waldron, David Jones, J. Richard
More information2.5.3 Antenna Temperature
ECEn 665: Antennas and Propagation for Wireless Communications 36.5.3 Antenna Temperature We now turn to thermal noise received by an antenna. An antenna in a warm environment receives not only a signal
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 informationNovel Multi-Beam Radiometers for Accurate Ocean Surveillance
Novel Multi-Beam Radiometers for Accurate Ocean Surveillance C. Cappellin 1, K. Pontoppidan 1, P.H. Nielsen 1, N. Skou 2, S. S. Søbjærg 2, M. Ivashina 3, O. Iupikov 3, A. Ihle 4, D. Hartmann 4, K. v. t
More informationPhased Array Feeds A new technology for wide-field radio astronomy
Phased Array Feeds A new technology for wide-field radio astronomy Aidan Hotan ASKAP Project Scientist 29 th September 2017 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of radio astronomy concepts
More informationANTENNA INTRODUCTION / BASICS
Rules of Thumb: 1. The Gain of an antenna with losses is given by: G 0A 8 Where 0 ' Efficiency A ' Physical aperture area 8 ' wavelength ANTENNA INTRODUCTION / BASICS another is:. Gain of rectangular X-Band
More informationProgress Towards Coherent Multibeam Arrays
Progress Towards Coherent Multibeam Arrays Doug Henke NRC Herzberg Astronomy and Astrophysics, Victoria, Canada August 2016 ALMA Band 3 Receiver (84 116 GHz) Dual linear, 2SB Feed horn OMT (two linear
More informationCharacterization of a Phased Array Feed Model
Brigham Young University BYU ScholarsArchive All Theses and Dissertations 2008-07-03 Characterization of a Phased Array Feed Model David A. Jones Brigham Young University - Provo Follow this and additional
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 informationPhased Array Feeds A new technology for multi-beam radio astronomy
Phased Array Feeds A new technology for multi-beam radio astronomy Aidan Hotan ASKAP Deputy Project Scientist 2 nd October 2015 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of radio astronomy concepts.
More informationPhased Array Feed Design. Stuart Hay 23 October 2009
Phased Array Feed Design Stuart Hay 23 October 29 Outline Why phased array feeds (PAFs) for radioastronomy? General features and issues of PAF approach Connected-array PAF approach in ASKAP Why PAFs? High
More informationResults from LWA1 Commissioning: Sensitivity, Beam Characteristics, & Calibration
Results from LWA1 Commissioning: Sensitivity, Beam Characteristics, & Calibration Steve Ellingson (Virginia Tech) LWA1 Radio Observatory URSI NRSM Jan 4, 2012 LWA1 Title 10-88 MHz usable, Galactic noise-dominated
More informationPractical Aspects of Focal Plane Array Testing
Practical Aspects of Focal Plane Array Testing Lessons from an FPA Test-bed at CSIRO, Marsfield Douglas B. Hayman1-3, Trevor S. Bird2,3, Karu P. Esselle3 and Peter J. Hall4 1 2 3 CSIRO Astronomy and Space
More informationMore Radio Astronomy
More Radio Astronomy Radio Telescopes - Basic Design A radio telescope is composed of: - a radio reflector (the dish) - an antenna referred to as the feed on to which the radiation is focused - a radio
More informationAntennas. Greg Taylor. University of New Mexico Spring Astronomy 423 at UNM Radio Astronomy
Antennas Greg Taylor University of New Mexico Spring 2011 Astronomy 423 at UNM Radio Astronomy Radio Window 2 spans a wide range of λ and ν from λ ~ 0.33 mm to ~ 20 m! (ν = 1300 GHz to 15 MHz ) Outline
More informationTraveling Wave Antennas
Traveling Wave Antennas Antennas with open-ended wires where the current must go to zero (dipoles, monopoles, etc.) can be characterized as standing wave antennas or resonant antennas. The current on these
More informationPhased Array Feeds for Parkes. Robert Braun Science with 50 Years Young
Phased Array Feeds for Parkes Robert Braun Science with Parkes @ 50 Years Young Outline PAFs in the SKA context PAFSKA activities Apertif, BYU, NRAO, NAIC, DRAO, ASKAP ASKAP PAF MkI ASKAP PAF MkII Parkes:
More informationAntennas. Greg Taylor. University of New Mexico Spring Astronomy 423 at UNM Radio Astronomy
Antennas Greg Taylor University of New Mexico Spring 2017 Astronomy 423 at UNM Radio Astronomy Outline 2 Fourier Transforms Interferometer block diagram Antenna fundamentals Types of antennas Antenna performance
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 informationINTERFERENCE REJECTION OF ADAPTIVE ARRAY ANTENNAS BY USING LMS AND SMI ALGORITHMS
INTERFERENCE REJECTION OF ADAPTIVE ARRAY ANTENNAS BY USING LMS AND SMI ALGORITHMS Kerim Guney Bilal Babayigit Ali Akdagli e-mail: kguney@erciyes.edu.tr e-mail: bilalb@erciyes.edu.tr e-mail: akdagli@erciyes.edu.tr
More informationONE of the most common and robust beamforming algorithms
TECHNICAL NOTE 1 Beamforming algorithms - beamformers Jørgen Grythe, Norsonic AS, Oslo, Norway Abstract Beamforming is the name given to a wide variety of array processing algorithms that focus or steer
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 informationReinventing Radio Astronomy PAF Technology. John O Sullivan, Centre for Astronomy and Space Science, CSIRO 2 April 2013
Reinventing Radio Astronomy PAF Technology John O Sullivan, Centre for Astronomy and Space Science, CSIRO 2 April 2013 The origins Beginning of time Optical and later infrared - power detectors/bolometers
More informationADVANCED 14/12 AND 30/20 GHz MULTIPLE BEAM ANTENNA TECHNOLOGY FOR COMMUNICATIONS SATELLITES
ADVANCED 14/12 AND 30/20 GHz MULTIPLE BEAM ANTENNA TECHNOLOGY FOR COMMUNICATIONS SATELLITES C.C. Chen TRW Defense and Space Systems Group Redondo Beach, CA 90278 ABSTRACT This paper discusses recent TRW
More informationDevelopment of an Experimental Phased-Array Feed System and Algorithms for Radio Astronomy
Brigham Young University BYU ScholarsArchive All Theses and Dissertations 2011-07-11 Development of an Experimental Phased-Array Feed System and Algorithms for Radio Astronomy Jonathan Charles Landon Brigham
More informationA Prototype Platform for Array Feed Development
Brigham Young University BYU ScholarsArchive All Theses and Dissertations 2006-10-20 A Prototype Platform for Array Feed Development James Richard Nagel Brigham Young University - Provo Follow this and
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 informationPLANAR BEAM-FORMING ARRAY FOR BROADBAND COMMUNICATION IN THE 60 GHZ BAND
PLANAR BEAM-FORMING ARRAY FOR BROADBAND COMMUNICATION IN THE 6 GHZ BAND J.A.G. Akkermans and M.H.A.J. Herben Radiocommunications group, Eindhoven University of Technology, Eindhoven, The Netherlands, e-mail:
More informationRECOMMENDATION ITU-R F.1819
Rec. ITU-R F.1819 1 RECOMMENDATION ITU-R F.1819 Protection of the radio astronomy service in the 48.94-49.04 GHz band from unwanted emissions from HAPS in the 47.2-47.5 GHz and 47.9-48.2 GHz bands * (2007)
More informationNumerical Approach for the Analysis and Optimization of Phased Array Feed Systems
Numerical Approach for the Analysis and Optimization of Phased Array Feed Systems The Netherlands Institute for Radio Astronomy (ASTRON) Supported by part: - The Netherlands Organization for Scientific
More informationFeed Array Breadboard for Future Passive Microwave Radiometer Antennas
Feed Array Breadboard for Future Passive Microwave Radiometer Antennas C. Cappellin 1, J. R. de Lasson 1, O. Iupikov 2, M. Ivashina 2, N. Skou 3, K. Pontoppidan 1, B. Fiorelli 4 1 TICRA, Copenhagen, Denmark,
More informationMULTI-FEED-PER-BEAM ANTENNA CONCEPT FOR HIGH-PERFORMANCE PASSIVE MICROWAVE RADIOMETERS
MULTI-FEED-PER-BEAM ANTENNA CONCEPT FOR HIGH-PERFORMANCE PASSIVE MICROWAVE RADIOMETERS C. Cappellin (1), J. R. de Lasson (1), K. Pontoppidan (1), N. Skou (2) (1) TICRA, Landemærket 29, DK 1119 Copenhagen,
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 informationAn Array Feed Radial Basis Function Tracking System for NASA s Deep Space Network Antennas
An Array Feed Radial Basis Function Tracking System for NASA s Deep Space Network Antennas Ryan Mukai Payman Arabshahi Victor A. Vilnrotter California Institute of Technology Jet Propulsion Laboratory
More informationTHEORY OF MEASUREMENTS
THEORY OF MEASUREMENTS Brian Mason Fifth NAIC-NRAO School on Single-Dish Radio Astronomy Arecibo, PR July 2009 OUTLINE Antenna-Sky Coupling Noise the Radiometer Equation Minimum Tsys Performance measures
More informationSchool of Electrical Engineering. EI2400 Applied Antenna Theory Lecture 8: Reflector antennas
School of Electrical Engineering EI2400 Applied Antenna Theory Lecture 8: Reflector antennas Reflector antennas Reflectors are widely used in communications, radar and radio astronomy. The largest reflector
More informationOPTICS OF SINGLE BEAM, DUAL BEAM & ARRAY RECEIVERS ON LARGE TELESCOPES J A M E S W L A M B, C A L T E C H
OPTICS OF SINGLE BEAM, DUAL BEAM & ARRAY RECEIVERS ON LARGE TELESCOPES J A M E S W L A M B, C A L T E C H OUTLINE Antenna optics Aberrations Diffraction Single feeds Types of feed Bandwidth Imaging feeds
More informationADAPTIVE ANTENNAS. TYPES OF BEAMFORMING
ADAPTIVE ANTENNAS TYPES OF BEAMFORMING 1 1- Outlines This chapter will introduce : Essential terminologies for beamforming; BF Demonstrating the function of the complex weights and how the phase and amplitude
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 informationRemoval of Radio-frequency Interference (RFI) from Terrestrial Broadcast Stations in the Murchison Widefield Array. A/Prof.
Removal of Radio-frequency Interference (RFI) from Terrestrial Broadcast Stations in the Murchison Widefield Array Present by Supervisors: Chairperson: Bach Nguyen Dr. Adrian Sutinjo A/Prof. Randall Wayth
More informationRecent Developments in Measuring Signal and Noise in Phased Array Feeds at CSIRO
Recent Developments in Measuring Signal and Noise in Phased Array Feeds at CSIRO A. P. Chippendale, D. McConnell, K. Bannister, N. Nikolic, A. W. Hotan, K. W. Smart, R. D. Shaw, D. B. Hayman, S. G. Hay
More informationGBT Spectral Baseline Investigation Rick Fisher, Roger Norrod, Dana Balser (G. Watts, M. Stennes)
GBT Spectral Baseline Investigation Rick Fisher, Roger Norrod, Dana Balser (G. Watts, M. Stennes) Points to Note: Wider bandwidths than were used on 140 Foot Cleaner antenna so other effects show up Larger
More informationAntennas and Receivers in Radio Astronomy
Antennas and Receivers in Radio Astronomy Mark McKinnon Eleventh Synthesis Imaging Workshop Socorro, June 10-17, 2008 Outline 2 Context Types of antennas Antenna fundamentals Reflector antennas Mounts
More informationEVLA Memo #119 Wide-Band Sensitivity and Frequency Coverage of the EVLA and VLA L-Band Receivers
EVLA Memo #119 Wide-Band Sensitivity and Frequency Coverage of the EVLA and VLA L-Band Receivers Rick Perley and Bob Hayward January 17, 8 Abstract We determine the sensitivities of the EVLA and VLA antennas
More informationREPORT ITU-R SA.2098
Rep. ITU-R SA.2098 1 REPORT ITU-R SA.2098 Mathematical gain models of large-aperture space research service earth station antennas for compatibility analysis involving a large number of distributed interference
More informationAdaptive Array Beamforming using LMS Algorithm
Adaptive Array Beamforming using LMS Algorithm S.C.Upadhyay ME (Digital System) MIT, Pune P. M. Mainkar Associate Professor MIT, Pune Abstract Array processing involves manipulation of signals induced
More informationAdaptive Beamforming. Chapter Signal Steering Vectors
Chapter 13 Adaptive Beamforming We have already considered deterministic beamformers for such applications as pencil beam arrays and arrays with controlled sidelobes. Beamformers can also be developed
More informationSome Notes on Beamforming.
The Medicina IRA-SKA Engineering Group Some Notes on Beamforming. S. Montebugnoli, G. Bianchi, A. Cattani, F. Ghelfi, A. Maccaferri, F. Perini. IRA N. 353/04 1) Introduction: consideration on beamforming
More informationOptimum Beamforming. ECE 754 Supplemental Notes Kathleen E. Wage. March 31, Background Beampatterns for optimal processors Array gain
Optimum Beamforming ECE 754 Supplemental Notes Kathleen E. Wage March 31, 29 ECE 754 Supplemental Notes: Optimum Beamforming 1/39 Signal and noise models Models Beamformers For this set of notes, we assume
More informationRadar Systems Engineering Lecture 15 Parameter Estimation And Tracking Part 1
Radar Systems Engineering Lecture 15 Parameter Estimation And Tracking Part 1 Dr. Robert M. O Donnell Guest Lecturer Radar Systems Course 1 Block Diagram of Radar System Transmitter Propagation Medium
More informationINTRODUCTION. Basic operating principle Tracking radars Techniques of target detection Examples of monopulse radar systems
Tracking Radar H.P INTRODUCTION Basic operating principle Tracking radars Techniques of target detection Examples of monopulse radar systems 2 RADAR FUNCTIONS NORMAL RADAR FUNCTIONS 1. Range (from pulse
More informationChalmers Publication Library
Chalmers Publication Library Analysis of the strut and feed blockage effects in radio telescopes with compact UWB feeds This document has been downloaded from Chalmers Publication Library (CPL). It is
More informationINSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad ELECTRONICS AND COMMUNIACTION ENGINEERING QUESTION BANK
INSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad - 500 04 ELECTRONICS AND COMMUNIACTION ENGINEERING QUESTION BANK Course Name : Antennas and Wave Propagation (AWP) Course Code : A50418 Class :
More informationRec. ITU-R F RECOMMENDATION ITU-R F *
Rec. ITU-R F.162-3 1 RECOMMENDATION ITU-R F.162-3 * Rec. ITU-R F.162-3 USE OF DIRECTIONAL TRANSMITTING ANTENNAS IN THE FIXED SERVICE OPERATING IN BANDS BELOW ABOUT 30 MHz (Question 150/9) (1953-1956-1966-1970-1992)
More informationEVLA Memo 173 Strut-Straddling Arrays for the VLA 4-meter Observing System
EVLA Memo 173 Strut-Straddling Arrays for the VLA 4-meter Observing System Steve Ellingson, Dan Mertley, Sterling Coffey, Ravi Subrahmanyan September 22, 2013 This memo describes several prototype strut
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 informationAN ADAPTIVE MOBILE ANTENNA SYSTEM FOR WIRELESS APPLICATIONS
AN ADAPTIVE MOBILE ANTENNA SYSTEM FOR WIRELESS APPLICATIONS G. DOLMANS Philips Research Laboratories Prof. Holstlaan 4 (WAY51) 5656 AA Eindhoven The Netherlands E-mail: dolmans@natlab.research.philips.com
More informationKULLIYYAH OF ENGINEERING
KULLIYYAH OF ENGINEERING DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING ANTENNA AND WAVE PROPAGATION LABORATORY (ECE 4103) EXPERIMENT NO 3 RADIATION PATTERN AND GAIN CHARACTERISTICS OF THE DISH (PARABOLIC)
More informationDIGITAL BEAM-FORMING ANTENNA OPTIMIZATION FOR REFLECTOR BASED SPACE DEBRIS RADAR SYSTEM
DIGITAL BEAM-FORMING ANTENNA OPTIMIZATION FOR REFLECTOR BASED SPACE DEBRIS RADAR SYSTEM A. Patyuchenko, M. Younis, G. Krieger German Aerospace Center (DLR), Microwaves and Radar Institute, Muenchner Strasse
More informationDesign of Rotman Lens Antenna at Ku-Band Based on Substrate Integrated Technology
Journal of Communication Engineering, Vol. 3, No.1, Jan.- June 2014 33 Design of Rotman Lens Antenna at Ku-Band Based on Substrate Integrated Technology S. A. R. Hosseini, Z. H. Firouzeh and M. Maddahali
More informationRandom Phase Antenna Combining for SETI SETICon03
Random Phase Antenna Combining for SETI SETICon03 Marko Cebokli S57UUU ABSTRACT: Since the direction from which the first ETI signal will arrive is not known in advance, it is possible to relax the phasing
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 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 informationAntenna Fundamentals Basics antenna theory and concepts
Antenna Fundamentals Basics antenna theory and concepts M. Haridim Brno University of Technology, Brno February 2017 1 Topics What is antenna Antenna types Antenna parameters: radiation pattern, directivity,
More informationAntennas 1. Antennas
Antennas Antennas 1! Grading policy. " Weekly Homework 40%. " Midterm Exam 30%. " Project 30%.! Office hour: 3:10 ~ 4:00 pm, Monday.! Textbook: Warren L. Stutzman and Gary A. Thiele, Antenna Theory and
More informationAN ALTERNATIVE METHOD FOR DIFFERENCE PATTERN FORMATION IN MONOPULSE ANTENNA
Progress In Electromagnetics Research Letters, Vol. 42, 45 54, 213 AN ALTERNATIVE METHOD FOR DIFFERENCE PATTERN FORMATION IN MONOPULSE ANTENNA Jafar R. Mohammed * Communication Engineering Department,
More informationExperimental Investigations of Adaptive Reactance Parasitic Antenna Dipole Array
PIERS ONLINE, VOL. 5, NO. 7, 2009 657 Experimental Investigations of Adaptive Reactance Parasitic Antenna Dipole Array M. O. Shuralev 1, 2, A. L. Umnov 1, 2, A. Mainwaring 3, M. A. Sokolov 1, 2, and A.
More informationFocal Plane Array Related Activities at CSIRO
ICT Centre /antennas Focal Plane Array Related Activities at CSIRO Trevor S. Bird (1), Douglas Hayman (1), Suzy Jackson (2) & Dick Ferris (2) (1) CSIRO ICT Centre (2) CSIRO Australia Telescope National
More informationSpace-Time Adaptive Processing Using Sparse Arrays
Space-Time Adaptive Processing Using Sparse Arrays Michael Zatman 11 th Annual ASAP Workshop March 11 th -14 th 2003 This work was sponsored by the DARPA under Air Force Contract F19628-00-C-0002. Opinions,
More informationTechnology Drivers, SKA Pathfinders P. Dewdney
Technology Drivers, SKA Pathfinders P. Dewdney Dominion Radio Astrophysical Observatory Herzberg Institute of Astrophysics National Research Council Canada National Research Council Canada Conseil national
More informationLE/ESSE Payload Design
LE/ESSE4360 - Payload Design 4.3 Communications Satellite Payload - Hardware Elements Earth, Moon, Mars, and Beyond Dr. Jinjun Shan, Professor of Space Engineering Department of Earth and Space Science
More informationAntenna Arrays. EE-4382/ Antenna Engineering
Antenna Arrays EE-4382/5306 - Antenna Engineering Outline Introduction Two Element Array Rectangular-to-Polar Graphical Solution N-Element Linear Array: Uniform Spacing and Amplitude Theory of N-Element
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 informationNull-steering GPS dual-polarised antenna arrays
Presented at SatNav 2003 The 6 th International Symposium on Satellite Navigation Technology Including Mobile Positioning & Location Services Melbourne, Australia 22 25 July 2003 Null-steering GPS dual-polarised
More informationFORMATION FLYING PICOSAT SWARMS FOR FORMING EXTREMELY LARGE APERTURES
FORMATION FLYING PICOSAT SWARMS FOR FORMING EXTREMELY LARGE APERTURES Presented at the ESA/ESTEC Workshop on Innovative System Concepts February 21, 2006 Ivan Bekey President, Bekey Designs, Inc. 4624
More informationRECOMMENDATION ITU-R BS.80-3 * Transmitting antennas in HF broadcasting
Rec. ITU-R BS.80-3 1 RECOMMENDATION ITU-R BS.80-3 * Transmitting antennas in HF broadcasting (1951-1978-1986-1990) The ITU Radiocommunication Assembly, considering a) that a directional transmitting antenna
More informationMiniaturized GPS Antenna Array Technology and Predicted Anti-Jam Performance
Miniaturized GPS Antenna Array Technology and Predicted Anti-Jam Performance Dale Reynolds; Alison Brown NAVSYS Corporation. Al Reynolds, Boeing Military Aircraft And Missile Systems Group ABSTRACT NAVSYS
More informationEigenvalues and Eigenvectors in Array Antennas. Optimization of Array Antennas for High Performance. Self-introduction
Short Course @ISAP2010 in MACAO Eigenvalues and Eigenvectors in Array Antennas Optimization of Array Antennas for High Performance Nobuyoshi Kikuma Nagoya Institute of Technology, Japan 1 Self-introduction
More informationElectronically Steerable planer Phased Array Antenna
Electronically Steerable planer Phased Array Antenna Amandeep Kaur Department of Electronics and Communication Technology, Guru Nanak Dev University, Amritsar, India Abstract- A planar phased-array antenna
More informationMulti-Mode Antennas for Hemispherical Field-of-View Coverage
Multi-Mode Antennas for Hemispherical Field-of-View Coverage D.S. Prinsloo P. Meyer R. Maaskant M.V. Ivashina Dept. of Electrical and Electronic Engineering Dept. of Signals and Systems Stellenbosch, South
More informationArray noise temperature measurements at the Parkes PAF Test-bed Facility
Array noise temperature measurements at the Parkes PAF Test-bed Facility Douglas B. Hayman, Aaron P. Chippendale, Robert D. Shaw and Stuart G. Hay MIDPREP 1 April 2014 COMPUTATIONAL INFORMATICS ASTRONOMY
More information4G MIMO ANTENNA DESIGN & Verification
4G MIMO ANTENNA DESIGN & Verification Using Genesys And Momentum GX To Develop MIMO Antennas Agenda 4G Wireless Technology Review Of Patch Technology Review Of Antenna Terminology Design Procedure In Genesys
More informationRECOMMENDATION ITU-R F *
Rec. ITU-R F.699-6 1 RECOMMENATION ITU-R F.699-6 * Reference radiation patterns for fixed wireless system antennas for use in coordination studies and interference assessment in the frequency range from
More informationSAGE Millimeter, Inc.
Description: Model SAM-5735930395-15-L1-4W is a linear polarized, 58 GHz microstrip patch 1 x 4 array antenna. The antenna array implements four individual antenna ports so that beamforming can be achieved
More informationDr. John S. Seybold. November 9, IEEE Melbourne COM/SP AP/MTT Chapters
Antennas Dr. John S. Seybold November 9, 004 IEEE Melbourne COM/SP AP/MTT Chapters Introduction The antenna is the air interface of a communication system An antenna is an electrical conductor or system
More information5G Antenna System Characteristics and Integration in Mobile Devices Sub 6 GHz and Milli-meter Wave Design Issues
5G Antenna System Characteristics and Integration in Mobile Devices Sub 6 GHz and Milli-meter Wave Design Issues November 2017 About Ethertronics Leader in advanced antenna system technology and products
More informationTHE KAROO ARRAY TELESCOPE (KAT) & FPA EFFORT IN SOUTH AFRICA
THE KAROO ARRAY TELESCOPE (KAT) & FPA EFFORT IN SOUTH AFRICA Dr. Dirk Baker (KAT FPA Sub-system Manager) Prof. Justin Jonas (SKA SA Project Scientist) Ms. Anita Loots (KAT Project Manager) Mr. David de
More informationNUMERICAL OPTIMIZATION OF A SATELLITE SHF NULLING MULTIPLE BEAM ANTENNA
NUMERICAL OPTIMIZATION OF A SATELLITE SHF NULLING MULTIPLE BEAM ANTENNA D. Maiarelli (1), R. Guidi (2), G. Galgani (2), V. Lubrano (1), M. Bandinelli (2) (1) Alcatel Alenia Space Italia, via Saccomuro,
More informationRadio Telescope Receivers
Radio Telescope Receivers Alex Dunning 25 th September 2017 CSIRO ASTRONOMY AND SPACE SCIENCE A radio receiver is an electronic device that receives radio waves and converts the information carried by
More informationMathematical models for radiodetermination radar systems antenna patterns for use in interference analyses
Recommendation ITU-R M.1851-1 (1/18) Mathematical models for radiodetermination radar systems antenna patterns for use in interference analyses M Series Mobile, radiodetermination, amateur and related
More informationTOWARDS A GENERALIZED METHODOLOGY FOR SMART ANTENNA MEASUREMENTS
TOWARDS A GENERALIZED METHODOLOGY FOR SMART ANTENNA MEASUREMENTS A. Alexandridis 1, F. Lazarakis 1, T. Zervos 1, K. Dangakis 1, M. Sierra Castaner 2 1 Inst. of Informatics & Telecommunications, National
More informationMemo 65 SKA Signal processing costs
Memo 65 SKA Signal processing costs John Bunton, CSIRO ICT Centre 12/08/05 www.skatelescope.org/pages/page_memos.htm Introduction The delay in the building of the SKA has a significant impact on the signal
More informationATCA Antenna Beam Patterns and Aperture Illumination
1 AT 39.3/116 ATCA Antenna Beam Patterns and Aperture Illumination Jared Cole and Ravi Subrahmanyan July 2002 Detailed here is a method and results from measurements of the beam characteristics of the
More informationPerformance Study of A Non-Blind Algorithm for Smart Antenna System
International Journal of Electronics and Communication Engineering. ISSN 0974-2166 Volume 5, Number 4 (2012), pp. 447-455 International Research Publication House http://www.irphouse.com Performance Study
More information