Volume 31, Issue 7 e22647
RESEARCH ARTICLE

A narrow-band circularly polarized leaky-wave antenna with open stopband suppressed

Shen-Da Xu

Shen-Da Xu

People's Liberation Army troops 94019, Hetian, China

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Dong-Fang Guan

Corresponding Author

Dong-Fang Guan

College of Electronic Science and Technology, National University of Defense Technology, Changsha, China

Correspondence

Dong-Fang Guan, College of Electronic Science and Technology, National University of Defense Technology, Changsha, 410073, China.

Email: [email protected]

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Li Liu

Li Liu

College of Electronic Science and Technology, National University of Defense Technology, Changsha, China

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Qingfeng Zhang

Qingfeng Zhang

Department of Electronics and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China

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Hantao Xu

Hantao Xu

College of Electronic Science and Technology, National University of Defense Technology, Changsha, China

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Shao-Wei Yong

Shao-Wei Yong

College of Electronic Science and Technology, National University of Defense Technology, Changsha, China

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First published: 28 April 2021
Citations: 9

Funding information: National Natural Science Foundation of China; National Postdoctoral Program for Innovative Talents of China; Shenzhen Science and Technology Innovation Committee funds

Abstract

In this paper, a narrow-band circularly polarized (CP) microstrip leaky-wave antenna (LWA) with open stopband suppressed is proposed. Coupled meandered slow-wave lines are adopted to realize narrow-band beam scanning. The asymmetric elements are employed as radiators to realize CP and zero-crossing scanning. We modulated the antenna by loading the ground inductance and asymmetric capacitors on the meandered slow-wave transmission line. The antenna consists of ten asymmetrical structural elements connected by coupling, the antenna size of L × W is 170 mm × 25 mm. In the operating band of 8.1 to 8.5 GHz, the measured scanning angel of the fabricated antenna is from −31°to +6°. The antenna axial ratios (ARs) are all below 3 dB at the corresponding beam directions. The gain is above 9.1 dBi and the relative bandwidth is only 4.8%. In the operating band, the radiation efficiency is above 60%. It has potential applications in radar detection and wireless communication systems for its simple and low-profile structure with CP, beam-scanning, and narrow-band performance.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from NUDT. Restrictions apply to the availability of these data, which were used under license for this study. Data are available from the authors with the permission of NUDT.

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