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Single-Layer Wideband Circularly Polarized High-Efficiency Reflectarray for Satellite Communications

Zhang, Long, Gao, Steven, Luo, Qi, Li, Wenting, He, Yejun, Li, Qingxia (2017) Single-Layer Wideband Circularly Polarized High-Efficiency Reflectarray for Satellite Communications. IEEE Transactions on Antennas and Propagation, 65 (9). pp. 4529-4538. ISSN 0018-926X. E-ISSN 1558-2221. (doi:10.1109/TAP.2017.2722824) (KAR id:62846)

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https://dx.doi.org/10.1109/TAP.2017.2722824

Abstract

This paper presents a single-layer circularly polarized (CP) reflectarray which achieves large bandwidth in terms of axial ratio (AR), gain, aperture efficiency and radiation pattern. By using a novel wideband S-shaped phasing element, an offset-fed reflectarray with 20° offset beam is designed based on the element angular rotation method. Theoretical analysis is given to analyze the effect of angular rotated elements on the performance of the reflectarray, which indicates that the AR bandwidth of the reflectarray can exceed the AR bandwidth of the feed horn. Furthermore, the influence of the differential spatial phase delay is analyzed quantitatively, and the performance of S-element-based reflectarrays with different aperture sizes are investigated and discussed. To verify these concepts, a 180mm×180mm prototype with 15×15 elements is fabricated and measured. The measured results confirm that the proposed reflectarray achieves a 68.5% 3-dB AR bandwidth (7.0 GHz to 14.3 GHz) and a 47.8% 3-dB gain bandwidth (8.6 GHz to 14 GHz). Moreover, the aperture efficiency is larger than 50% in a 33% bandwidth and larger than 30% in a 64% bandwidth.

Item Type: Article
DOI/Identification number: 10.1109/TAP.2017.2722824
Uncontrolled keywords: Circular polarization, wideband array, element rotation method, reflectarray
Subjects: T Technology
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 16 Aug 2017 08:34 UTC
Last Modified: 16 Feb 2021 13:47 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/62846 (The current URI for this page, for reference purposes)
Gao, Steven: https://orcid.org/0000-0002-7402-9223
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