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Design of a Wideband Dual-Feed Circularly Polarized Antenna for Different Axial Ratio Requirements

Wen, Lehu, Gao, Steven, Luo, Qi, Hu, Wei, Sanz Izquierdo, Benito (2020) Design of a Wideband Dual-Feed Circularly Polarized Antenna for Different Axial Ratio Requirements. IEEE Antennas and Wireless Propagation Letters, . p. 1. ISSN 1536-1225. (doi:10.1109/LAWP.2020.3041362) (KAR id:84698)

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https://doi.org/10.1109/LAWP.2020.3041362

Abstract

A novel method of designing a wideband dual-feed circularly polarized (CP) antenna is presented for different axial ratio (AR) requirements. The output characteristics of the feed network for the dual-feed CP antenna is first analyzed and illustrated that how to obtain the variance ranges of the output magnitude and phase of the feed network for a required AR. Based on the analysis, different branch-line couplers are used for achieving wide AR bandwidths of less than 3 dB, 2 dB, and 1 dB respectively. Compared to the traditionally used 3 dB coupler, the presented feed method can have an AR peak with the expected value at the center frequency and two AR valleys beside the peak, while the traditional 3 dB coupler can only get an AR valley with narrower bandwidth. Therefore, much wider AR bandwidths for different AR requirements are obtained by using the presented method. The wideband dual-feed antenna fed by these different couplers was also simulated, fabricated, and measured for the final performance verification.

Item Type: Article
DOI/Identification number: 10.1109/LAWP.2020.3041362
Uncontrolled keywords: Axial ratio, circularly polarized antenna, dual-feed, wide bandwidth
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 03 Dec 2020 15:20 UTC
Last Modified: 16 Feb 2021 14:16 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/84698 (The current URI for this page, for reference purposes)
Wen, Lehu: https://orcid.org/0000-0001-9757-1114
Gao, Steven: https://orcid.org/0000-0002-7402-9223
Sanz Izquierdo, Benito: https://orcid.org/0000-0001-7313-2520
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