Dual circularly polarized monostatic STAR antenna with enhanced isolation

doi:10.23919/JSEE.2024.000003

Journal of Systems Engineering and Electronics ›› 2025, Vol. 36 ›› Issue (1): 73-81.doi: 10.23919/JSEE.2024.000003

• ELECTRONICS TECHNOLOGY • Previous Articles

Dual circularly polarized monostatic STAR antenna with enhanced isolation

Mingcong XIE¹(), Xizhang WEI¹^,*(), Yanqun TANG¹(), Dujuan HU²()

¹ School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China
² School of Systems Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China

Received:2022-11-08 Accepted:2024-01-13 Online:2025-02-18 Published:2025-03-18
Contact: Xizhang WEI E-mail:xiemc3@mail2.sysu.edu.cn;weixzh7@mail.sysu.edu.cn;tangyq8@mail.sysu.edu.cn;hudj@mail2.sysu.edu.cn
About author:
XIE Mingcong was born in 1993. He received his M.S. degree in electronic and communication engineering from the School of Information and Communication, Guilin University of Electronic Technology Guilin, China in 2020. His current research interests focus on simultaneous transmit and receive antenna. E-mail: xiemc3@mail2.sysu.edu.cn

WEI Xizhang was born in 1976. He received his Ph.D. degree in information and communication engineering from the School of Electronic Science and Technology, National University of Defense Technology, China, in 2002. He is a professor and doctoral supervisor with the School of Electronics and Communication Engineering, Sun Yat-sen University. His current interests include full-duplex, intelligent target recognition, electronic war, and artiﬁcial intelligence. E-mail: weixzh7@mail.sysu.edu.cn

TANG Yanqun was born in 1985. He received his B.Sc., M.Sc., and Ph.D. degrees in information and communication engineering from the School of Electronic Science and Engineering, National University of Defense Technology, China, in 2007, 2009, and 2013 respectively. He is an assistant professor at the School of Electronics and Communication Engineering, Sun Yat-sen University, Shenzhen, China. His research interests are wireless physical layer security, full-duplex communications, and machine learning techniques for wireless communications. E-mail: tangyq8@mail.sysu.edu.cn

HU Dujuan was born in 1993. She received her M.S. degree in biomedical engineering from the School of Information Engineering, Nanchang University in 2019, where she is currently working toward her Ph.D. degree in the School of Systems Science and Engineering from Sun Yat-sen University China. Her current research interests focus on simultaneous transmit and receive, array signal processing, and digital beamforming. E-mail: hudj@mail2.sysu.edu.cn
Supported by:
This work was supported by Guangdong Natural Science Foundation (2019A1515011622), Guangdong Provincial Laboratory of Southern Marine Science and Engineering (Zhuhai) (SML2021SP407).

Abstract

Abstract:

Separated transmit and receive antennas are employed to improve transmit-receive isolation in conventional short-range radars, which greatly increases the antenna size and misaligns of the transmit/receive radiation patterns. In this paper, a dual circularly polarized (CP) monostatic simultaneous transmit and receive (MSTAR) antenna with enhanced isolation is proposed to alleviate the problem. The proposed antenna consists of one sequentially rotating array (SRA), two beamforming networks (BFN), and a combined decoupling structure. The SRA is shared by the transmit and receive to reduce the size of the antenna and to obtain a consistent transmit and receive pattern. The BFN achieve right-hand CP for transmit and left-hand CP for receive. By exploring the combined decoupling structure of uniplanar compact electromagnetic band gap (UC-EBG) and ring-shaped defected ground structure (RS-DGS), good transmit-receive isolation is achieved. The proposed antenna prototype is fabricated and experimentally characterized. The simulated and measured results show good agreement. The demonstrate transmit/receive isolation is height than 33 dB, voltage standing wave ratio is lower than 2, axial ratio is lower than 3 dB, and consistent radiation for both transmit and receive is within 4.25?4.35 GHz.

Key words: dual circularly polarization (CP), monostatic simultaneous transmit and receive (MSTAR), sequential rotation array (SRA), uniplanar compact electromagnetic band gap (UC-EBG), ring-shaped defected ground structure (RS-DGS)

Mingcong XIE, Xizhang WEI, Yanqun TANG, Dujuan HU. Dual circularly polarized monostatic STAR antenna with enhanced isolation[J]. Journal of Systems Engineering and Electronics, 2025, 36(1): 73-81.

Figures/Tables 8

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References 30

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Method	Transmit polarization	Receive polarization	Volume	Aperture efficiency	Bandwidth/GHz	Isolation level/dB
Method in [10]	RHCP	RHCP	$1.25{\lambda _0} \times 1.25{\lambda _0} \times 0.31{\lambda _0}$	31.3	1.25−2.5	>38
Method in [14]	RHCP	RHCP	$1.0{\lambda _0} \times 1.0{\lambda _0} \times 0.02{\lambda _0}$	39.9	2.4−2.5	40−58
Method in [18]	RHCP	RHCP	$1.64{\lambda _0} \times 1.64{\lambda _0} \times 0.03{\lambda _0}$	32.5	2.4−2.5	40−50
Method in [26]	RHCP	RHCP	$1.44{\lambda _0} \times 1.44{\lambda _0} \times 0.38{\lambda _0}$	29.9	0.65−2.7	>27
Method in [30]	RHCP	RHCP	$1.08{\lambda _0} \times 1.08{\lambda _0} \times 0.14{\lambda _0}$	29.5	5.4−5.6	>33
The proposed method	RHCP	LHCP	$1.27{\lambda _0} \times 1.27{\lambda _0} \times 0.01{\lambda _0}$	41	4.25−4.35	33−45

Dual circularly polarized monostatic STAR antenna with enhanced isolation

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