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Compact Broadband Dual-Sense Circularly Polarized Microstrip Antenna/Array With Enhanced Isolation

Mao, Chun-Xu, Gao, Steven, Wang, Yi, Sri Sumantyo, Josaphat Tetuko (2017) Compact Broadband Dual-Sense Circularly Polarized Microstrip Antenna/Array With Enhanced Isolation. IEEE Transactions on Antennas and Propagation, 65 (12). pp. 7073-7082. ISSN 0018-926X. (doi:10.1109/TAP.2017.2766440) (KAR id:65137)

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This paper presents a novel method of designing the compact dual-sense circularly polarized (CP) microstrip antenna/array with improved impedance bandwidth, axial ratio (AR) bandwidth, and interpolarization isolation. The left-hand and right-hand CP characteristics are achieved simultaneously by conceiving a vertically coupled resonant structure for the first time. Different from traditional methods, the antenna shows a compact size but exhibits the wide impedance and 3 dB AR bandwidths. For each input, two coupling paths are purposely designed to excite the TM10 and TM01-mode of the patch, respectively. By composing different coupling units in the two paths, an intrinsic ±90° phase difference over a broadband can be obtained, resulting in the broadband CP characteristics. In addition, a novel method of using the neutralization line between the two feeds is investigated to improve the isolation between the polarizations. Based on the dual-sense CP element, a 1×4 dual-sense CP array is composed to exemplify its potential applications in large arrays. Compared with traditional CP antennas, the proposed antennas have the advantages of compact size, simplified feed, broad impedance and 3 dB AR bandwidths, and improved isolation. Experimental results verify the predictions.

Item Type: Article
DOI/Identification number: 10.1109/TAP.2017.2766440
Uncontrolled keywords: Array antenna, broadband, circularly polarized (CP), compact, dual sense, isolation, microstrip antenna
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 08 Dec 2017 14:55 UTC
Last Modified: 16 Feb 2021 13:51 UTC
Resource URI: (The current URI for this page, for reference purposes)
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