GA-based approach to phase compensation of large phased array antennas

doi:10.21629/JSEE.2018.04.07

Journal of Systems Engineering and Electronics ›› 2018, Vol. 29 ›› Issue (4): 723-730.doi: 10.21629/JSEE.2018.04.07

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GA-based approach to phase compensation of large phased array antennas

Amir ZAHEDI*(), Bijan ABBASI ARAND()

Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 14115-111, Iran

Received:2017-04-30 Online:2018-08-01 Published:2018-08-30
Contact: Amir ZAHEDI E-mail:amir.zahedy@modares.ac.ir;abbasi@modares.ac.ir
About author:ZAHEDI Amir was born in 1988. He obtained his B.S. degree in electrical engineering from Mehrastan University, Astaneh-ye Ashrafiyeh, Iran and M.S. degree in electrical engineering from Tarbiat Modares University, Tehran, Iran. He has been a member in the Student Activities Committee of the IEEE Iran Section since 2014. His current research interests include antenna and propagation, microwave circuits and optimization methods applied to electromagnetic problems. E-mail: amir.zahedy@modares.ac.ir|ABBASI ARAND Bijan received his B.S. degree from Shiraz University, Shiraz, Iran in 1995 and M.S. and Ph.D. degrees in telecommunication engineering from Tarbiat Modares University, Tehran, Iran in 1997 and 2003, respectively. From 2003 to 2005, he was a researcher of the Electromagnetic Propagation Department at Iran Telecommunication Research Center (ITRC). In 2005, he joined the Satellite Communication Laboratory of Tarbiat Modares University as a Postdoctoral Researcher. Since 2010, he has been an assistant professor at the Faculty of Electrical and Computer Engineering of Tarbiat Modares University. E-mail: abbasi@modares.ac.ir

Abstract

Abstract:

The investigation of the effect of electrical and mechanical errors on the performance of a large active phased array antenna is studied. These errors can decrease the antenna performance, for instance, the gain reduction, side lobe level enhancement, and incorrect beam direction. In order to improve the performance of the antenna in the presence of these errors, phase error correction of large phased array antennas using the genetic algorithm (GA) is implemented. By using the phase compensation method, the antenna overall radiation pattern is recovered close to the ideal radiation pattern without error. By applying the simulation data to a 32×40 array of elements with a square grid at the frequency of S-band and measurement of the radiation pattern, the effectiveness of the proposed method is verified.

Key words: antenna, genetic algorithm (GA), phased array, radiating element

Amir ZAHEDI, Bijan ABBASI ARAND. GA-based approach to phase compensation of large phased array antennas[J]. Journal of Systems Engineering and Electronics, 2018, 29(4): 723-730.

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References 11

1	WANG H S C. Performance of phased-array antennas with mechanical errors. IEEE Trans. on Aerospace and Electronic Systems, 1992, 28(2): 535-545.
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Operation	Gainenhancementaftercorrection/dB	Gainreductionbeforecorrection/dB	HPBWaftercorrection/(°)	HPBWbeforecorrection/(°)
$\phi {\rm{ = 0^\circ }}$	0.78	–1.12	3.74°	4.61°

Operation	Beamdeviationaftercorrection	Beamdeviationbeforecorrection	HPBWaftercorrection/(°)	HPBWbeforecorrection/(°)
$\phi {\rm{ = 90^\circ }}$	0	1°	2.33°	2.48°

Operation	Gainenhancementaftercorrection/dB	Gainreductionbeforecorrection/dB	HPBWaftercorrection/(°)	HPBWbeforecorrection/(°)
$\phi {\rm{ = 0^\circ }}$	1.5	–2	3.74	4.61
$\phi {\rm{ = 90^\circ }}$	1.5	-2	2.24	2.84

Operation	Side-lobe level aftercorrection/dB	HPBW aftercorrection/(°)
$\phi {\rm{ = 0^\circ }}$	–12.78/–13.7	2.8
$\phi {\rm{ = 9}}{{\rm{0}}^\circ }, {\theta _0} = {0^\circ } $	–12.47/–13.91	2.3
$\phi {\rm{ = }}{{\rm{0}}^\circ }, {\theta _0} = {30^\circ }$	–12.78/–13.68	3.2
$\phi {\rm{ = 9}}{{\rm{0}}^\circ }, {\theta _0} = {30^\circ }$	–12.48/–13.92	2.67

Operation	Side-lobe level aftercorrection/dB	First side-lobebefore correction/dB	HPBW aftercorrection/(°)
$\phi {\rm{ = 0^\circ }}$	–12.78/–13.68	-11.78	2.74
$\phi {\rm{ = 9}}{{\rm{0}}^\circ }$	–13.7/–12.3	-11.18	2

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GA-based approach to phase compensation of large phased array antennas

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