Tutorial Session 1:  Phased Array Antenna Measurements

Phased Array Antenna Measurements

Dr. Alan J. Fenn, Fellow IEEE, Senior Staff, MIT Lincoln Laboratory; Dr. Charles Kryzak, Alion Science and Technology   Overview  Accurate characterization of RF phased array antenna systems, typically in an indoor anechoic chamber environment, is desired prior to field deployment for communications and radar applications.  This tutorial reviews various measurement techniques currently being applied to characterize analog and digital phased array antennas - both for determination of the far-field patterns and for element diagnostics and array phase and amplitude alignment.  Theory behind the methods and examples of measurements of antenna arrays using the following techniques will be discussed:   • Planar near-field • Cylindrical near-field  • Spherical near-field • Compact range and far-field • Focused near-field adaptive array Other phased array measurement topics including array mutual coupling, scan reflection coefficient, element gain, ultrawideband arrays, and on-platform measurements will be presented. Attendees will receive the following tutorial materials: Book:  A.J. Fenn, Adaptive Antennas and Phased Arrays for Radar and Communications, Artech, 2008. Electronic copy: Tutorial presentation slides

Part 1: Phased Array Antenna Measurements Using Near-Field Techniques

Alan J. Fenn, PhD, MIT Lincoln Laboratory, USA   This tutorial provides an overview of phased array antenna measurements, with an emphasis on planar near-field scanning.    Lincoln Laboratory’s new large planar near-field scanning facility for phased array measurements will be reviewed. Outline • Introduction / background • Basic array parameters and measurement o Array mutual coupling o Scan reflection/transmission coefficients o Element gain • Phased array antenna measurement techniques o Introduction o Measurement Techniques - Far-field - Compact range - Focused near-field range - Near-field scanning (planar, cylindrical, spherical) • Planar near-field scanning for low-sidelobe arrays o Theory o Results o Summary  

Part 2: Spherical Near-Field Facility: Calibration and System Performance Verification of Analog and Digital Phased Array

Antennas

Dr. Charles Kryzak, Technology Director/Principle RF Engineer, Weapons Systems and Sensors Division, Alion Science and Technology, USA Overview The development of independent digitally controlled transmitter and receiver phased array channel architectures has driven Lockheed-Martin (LM) to address the difficult aspect of array-level channel balancing and equalization.  To support this development, LM-Ground Based Radar Division designed and constructed a very large Spherical Near-field Anechoic Chamber facility at its Syracuse, NY location. The choice of spherical near-field scanning was made to enable the measurement of far sidelobes and direct backlobes of the radar antenna pattern.  The anechoic chamber RF shielding is rated up through 18 GHz and the RF absorber is rated from the lower UHF through 40 GHz.  The chamber absorber and HVAC system are designed to sustain average incident power levels in excess of 1500 Watts/sq-meter, allowing for operation of the antenna at high peak levels. The electronic data acquisition system was designed to address the testing of phased array systems with a variety of architectures:  either analog-controlled or fully-independent digitally controlled transmit functions plus digital I/Q channelized receive functions.  To establish accurate pair-wise channel amplitude and phase mismatch, careful attention has been paid to transmit and receive “real-time” pulse I/Q characterization, together with receive channel amplitude and phase ripple equalization. Techniques have been developed which address the more difficult test requirements dictated by independent “distributed” waveform generation which are driven by the subtle stable reference receiver-function required to remove residual measurement phase drift.

Part 3:  Adaptive Phased Array Antenna Measurements Using Focused Near-Field Techniques 

Dr. Alan J. Fenn, MIT Lincoln Laboratory

 

Outline Introduction / background  Adaptive array testing considerations Comparison of far-field and near-field interference Focused near-field adaptive nulling test concept and simulations Adaptive phased array test bed and measurements Summary    Biographies  Dr. Alan J. Fenn, PhD   Alan Fenn is a senior staff member in the RF Technology Group at Lincoln Laboratory, Massachusetts Institute of Technology.  He is deputy manager for antenna measurements in the RF Systems Test Facility at Lincoln Laboratory.  He has conducted extensive research in the area of phased array antennas.  He joined Lincoln Laboratory in 1981 and was a member of the Space Radar Technology Group from 1982 to 1991, where his primary research was in adaptive phased-array antenna design and testing.  From 1992 to 1999 he was an assistant group leader in the Radio Frequency Technology Group where he managed programs involving RF measurements of atmospheric effects on satellite communications.  From 1978 to 1981, he was a senior engineer in the Antenna Systems and Design/Analysis Group in the RF Systems Department at Martin Marietta Aerospace, Denver, Colorado.  He received a B.S. from the University of Illinois at Chicago in 1974, and an M.S. in 1976 and a Ph.D. in 1978 from The Ohio State University, Columbus, all in electrical engineering. Dr. Fenn was elected a Fellow of the IEEE in 2000 for his contributions to the theory and practice of adaptive phased-array antennas.  He is currently serving as the Technical Program Chair of the 2016 IEEE International Symposium on Phased Array Systems & Technology.   He was technical co-chair of the 2001 IEEE Antennas and Propagation Society Symposium.  He has served as an associate editor in the area of adaptive antennas for the IEEE Transactions on Antennas and Propagation.  He was a co-recipient of the 2016 IEEE Aerospace Conference M. Charles Fogg Best Paper Award.   In 1990 he was a co-recipient of the IEEE Antennas and Propagation Society’s H.A. Wheeler Applications Prize Paper Award.  He also received the IEEE/URSI-sponsored 1994 International Symposium on Antennas (JINA 94) Award.  Dr. Fenn has authored the book Adaptive Antennas and Phased Arrays for Radar and Communications as well as three other books and numerous journal articles, patents, and short-course lectures and conference presentations on phased array antennas. Dr. Charles Kryzak Chuck Kryzak retired 2015 Lockheed Martin Fellow and Hardware-Systems Architect under Ground Base Radar Systems in Syracuse, NY, and subsequently accepted a position as Technology Director/Principle RF Engineer with the Weapons Systems and Sensors Division of Alion Science and Technology in Rome NY. He received a Ph.D. in Physics from RPI, Troy, NY and jointly served as Research Assistant under the EE department. As Alion’s RF Systems PI he developed /delivered DSP techniques in waveform detection, pulsed/CW signal re-construction, and coherent noise reduction completing detailed performance characterization of ONR’s 40GHz RF sampler.  He designed the ESA aperture, developed 8-bit “256-state” TTD Beam Former specification and control , and was lead test engineer working with technology partner GE GRD, Niskayuna, NY for the joint Army/AFRL/GE CRD/ Alion USSOCOM SOF Deployable Ku-band VSAT Electronically Steerable Array (ESA) “Communications on the Move” (COTM) initiative.  As Technology Director he is systems PI for Alion’s adaptive spectrum selective RF jammer, and their Foliage Penetrating Radar development which includes polarimetric target discrimination,  > 500MHz IBW, neural network based adaptive beam forming and multi-target tracking: insertions include autonomous UAV detection and threat mitigation, and remote occluded personnel surveillance. While at Lockheed Martin, he lead the Surveillance Radar (SR) antenna aperture design for the Tri-National “US Army's” MEADS SR/MFCR Missile Defense System, and he designed and developed the associated RF radar timing, and digital control/data distribution networks for both SR and MFCR. He developed high resolution SR radiating element models, and 3D EM simulated the full SR phased array using a combination of FEM and FDTD techniques in order to verify/optimized SR array front-side/back-side beam and null generation performance capabilities, and margins, against program mission requirements.  As LM antenna test lead, he developed all array Near-Field calibration procedures, and personally verified phased array element and fractional array beam performance measurements for LM’s Space Fence, AMDR, SEWIP High Band Array, MEADS SR, NOAA PAR aperture, and assisted Syracuse Research Corp’s LCMR update.    He was directly responsible for all of LM Syracuse’s Spherical Near-Field chamber performance specification and chamber development. He designed, developed, and reduced to full production the fully ruggedized Quad-Channel Optic Transceivers which are architecture and production baselines for the entire tactical avionic digital distribution networks within the Joint Strike Fighter (JSF) and F-16 Block60 aircraft.  He has subsequently delivered an invited short paper "Optical Component/Hardware Insertion in to Tactical/Sensor Systems: Risks and Lessons Learned" at the IEEE 2011 Avionics, Fiber-Optics and Photonics Conference, San Diego, CA. He is a member of Sigma Xi, IEEE, the American Physical Society, and has ten patents and publications related to optical array transceiver design, MMIC wafer processing, and non-blocking computer network switching architectures.
Attendees of this tutorial will also receive a hardback copy of the book “Adaptive Antennas and Phased Arrays for Radar and Communications” by Dr. Alan J. Fenn
Tuesday, 18 October 8:00 AM - 12:00 Noon Eden Vale Ballroom C
2016 IEEE International Symposium on Phased Array Systems and Technology
18 - 21 October 2016 Waltham, MA USA
Tutorial Session 1:  Phased Array Antenna Measurements

Phased Array Antenna Measurements

Dr. Alan J. Fenn, Fellow IEEE, Senior Staff, MIT Lincoln Laboratory; Dr. Charles Kryzak, Alion Science and Technology   Overview  Accurate characterization of RF phased array antenna systems, typically in an indoor anechoic chamber environment, is desired prior to field deployment for communications and radar applications.  This tutorial reviews various measurement techniques currently being applied to characterize analog and digital phased array antennas - both for determination of the far-field patterns and for element diagnostics and array phase and amplitude alignment.  Theory behind the methods and examples of measurements of antenna arrays using the following techniques will be discussed:   • Planar near-field • Cylindrical near-field  • Spherical near-field • Compact range and far-field • Focused near-field adaptive array Other phased array measurement topics including array mutual coupling, scan reflection coefficient, element gain, ultrawideband arrays, and on- platform measurements will be presented. Attendees will receive the following tutorial materials: Book:  A.J. Fenn, Adaptive Antennas and Phased Arrays for Radar and Communications, Artech, 2008. Electronic copy: Tutorial presentation slides

Part 1: Phased Array Antenna Measurements Using Near-

Field Techniques

Alan J. Fenn, PhD, MIT Lincoln Laboratory, USA   This tutorial provides an overview of phased array antenna measurements, with an emphasis on planar near-field scanning.    Lincoln Laboratory’s new large planar near-field scanning facility for phased array measurements will be reviewed. Outline • Introduction / background • Basic array parameters and measurement o Array mutual coupling o Scan reflection/transmission coefficients o Element gain • Phased array antenna measurement techniques o Introduction o Measurement Techniques - Far-field - Compact range - Focused near-field range - Near-field scanning (planar, cylindrical, spherical) • Planar near-field scanning for low-sidelobe arrays o Theory o Results o Summary  

Part 2: Spherical Near-Field Facility: Calibration and

System Performance Verification of Analog and Digital

Phased Array Antennas

Dr. Charles Kryzak, Technology Director/Principle RF Engineer, Weapons Systems and Sensors Division, Alion Science and Technology, USA Overview The development of independent digitally controlled transmitter and receiver phased array channel architectures has driven Lockheed-Martin (LM) to address the difficult aspect of array-level channel balancing and equalization.  To support this development, LM-Ground Based Radar Division designed and constructed a very large Spherical Near-field Anechoic Chamber facility at its Syracuse, NY location. The choice of spherical near-field scanning was made to enable the measurement of far sidelobes and direct backlobes of the radar antenna pattern.  The anechoic chamber RF shielding is rated up through 18 GHz and the RF absorber is rated from the lower UHF through 40 GHz.  The chamber absorber and HVAC system are designed to sustain average incident power levels in excess of 1500 Watts/sq-meter, allowing for operation of the antenna at high peak levels. The electronic data acquisition system was designed to address the testing of phased array systems with a variety of architectures:  either analog-controlled or fully-independent digitally controlled transmit functions plus digital I/Q channelized receive functions.  To establish accurate pair-wise channel amplitude and phase mismatch, careful attention has been paid to transmit and receive “real-time” pulse I/Q characterization, together with receive channel amplitude and phase ripple equalization. Techniques have been developed which address the more difficult test requirements dictated by independent “distributed” waveform generation which are driven by the subtle stable reference receiver-function required to remove residual measurement phase drift.

Part 3:  Adaptive Phased Array Antenna Measurements

Using Focused Near-Field Techniques 

Dr. Alan J. Fenn, MIT Lincoln Laboratory

 

Outline Introduction / background  Adaptive array testing considerations Comparison of far-field and near-field interference Focused near-field adaptive nulling test concept and simulations Adaptive phased array test bed and measurements Summary    Biographies  Dr. Alan J. Fenn, PhD   Alan Fenn is a senior staff member in the RF Technology Group at Lincoln Laboratory, Massachusetts Institute of Technology.  He is deputy manager for antenna measurements in the RF Systems Test Facility at Lincoln Laboratory.  He has conducted extensive research in the area of phased array antennas.  He joined Lincoln Laboratory in 1981 and was a member of the Space Radar Technology Group from 1982 to 1991, where his primary research was in adaptive phased-array antenna design and testing.  From 1992 to 1999 he was an assistant group leader in the Radio Frequency Technology Group where he managed programs involving RF measurements of atmospheric effects on satellite communications.  From 1978 to 1981, he was a senior engineer in the Antenna Systems and Design/Analysis Group in the RF Systems Department at Martin Marietta Aerospace, Denver, Colorado.  He received a B.S. from the University of Illinois at Chicago in 1974, and an M.S. in 1976 and a Ph.D. in 1978 from The Ohio State University, Columbus, all in electrical engineering. Dr. Fenn was elected a Fellow of the IEEE in 2000 for his contributions to the theory and practice of adaptive phased-array antennas.  He is currently serving as the Technical Program Chair of the 2016 IEEE International Symposium on Phased Array Systems & Technology.   He was technical co-chair of the 2001 IEEE Antennas and Propagation Society Symposium.  He has served as an associate editor in the area of adaptive antennas for the IEEE Transactions on Antennas and Propagation.  He was a co-recipient of the 2016 IEEE Aerospace Conference M. Charles Fogg Best Paper Award.   In 1990 he was a co-recipient of the IEEE Antennas and Propagation Society’s H.A. Wheeler Applications Prize Paper Award.  He also received the IEEE/URSI-sponsored 1994 International Symposium on Antennas (JINA 94) Award.  Dr. Fenn has authored the book Adaptive Antennas and Phased Arrays for Radar and Communications as well as three other books and numerous journal articles, patents, and short- course lectures and conference presentations on phased array antennas. Dr. Charles Kryzak Chuck Kryzak retired 2015 Lockheed Martin Fellow and Hardware-Systems Architect under Ground Base Radar Systems in Syracuse, NY, and subsequently accepted a position as Technology Director/Principle RF Engineer with the Weapons Systems and Sensors Division of Alion Science and Technology in Rome NY. He received a Ph.D. in Physics from RPI, Troy, NY and jointly served as Research Assistant under the EE department. As Alion’s RF Systems PI he developed /delivered DSP techniques in waveform detection, pulsed/CW signal re-construction, and coherent noise reduction completing detailed performance characterization of ONR’s 40GHz RF sampler.  He designed the ESA aperture, developed 8- bit “256-state” TTD Beam Former specification and control , and was lead test engineer working with technology partner GE GRD, Niskayuna, NY for the joint Army/AFRL/GE CRD/ Alion USSOCOM SOF Deployable Ku-band VSAT Electronically Steerable Array (ESA) “Communications on the Move” (COTM) initiative.  As Technology Director he is systems PI for Alion’s adaptive spectrum selective RF jammer, and their Foliage Penetrating Radar development which includes polarimetric target discrimination,  > 500MHz IBW, neural network based adaptive beam forming and multi-target tracking: insertions include autonomous UAV detection and threat mitigation, and remote occluded personnel surveillance. While at Lockheed Martin, he lead the Surveillance Radar (SR) antenna aperture design for the Tri-National “US Army's” MEADS SR/MFCR Missile Defense System, and he designed and developed the associated RF radar timing, and digital control/data distribution networks for both SR and MFCR. He developed high resolution SR radiating element models, and 3D EM simulated the full SR phased array using a combination of FEM and FDTD techniques in order to verify/optimized SR array front- side/back-side beam and null generation performance capabilities, and margins, against program mission requirements.  As LM antenna test lead, he developed all array Near-Field calibration procedures, and personally verified phased array element and fractional array beam performance measurements for LM’s Space Fence, AMDR, SEWIP High Band Array, MEADS SR, NOAA PAR aperture, and assisted Syracuse Research Corp’s LCMR update.    He was directly responsible for all of LM Syracuse’s Spherical Near-Field chamber performance specification and chamber development. He designed, developed, and reduced to full production the fully ruggedized Quad-Channel Optic Transceivers which are architecture and production baselines for the entire tactical avionic digital distribution networks within the Joint Strike Fighter (JSF) and F-16 Block60 aircraft.  He has subsequently delivered an invited short paper "Optical Component/Hardware Insertion in to Tactical/Sensor Systems: Risks and Lessons Learned" at the IEEE 2011 Avionics, Fiber-Optics and Photonics Conference, San Diego, CA. He is a member of Sigma Xi, IEEE, the American Physical Society, and has ten patents and publications related to optical array transceiver design, MMIC wafer processing, and non-blocking computer network switching architectures.
Attendees of this tutorial will also receive a hardback copy of the book “Adaptive Antennas and Phased Arrays for Radar and Communications” by Dr. Alan J. Fenn
Tuesday, 18 October 8:00 AM - 12:00 Noon Eden Vale Ballroom C
2016 IEEE International Symposium on Phased Array Systems  and Technology
18 - 21 October 2016 Waltham, MA USA