University of Hertfordshire

From the same journal

By the same authors

Documents

  • Qiaoshan Zhang
  • Mingtao Zhang
  • Xiaowei Shi
  • Steven Gao
  • Qi Luo
  • Lei Chen
  • Jixiang Wan
  • Xudong Wang
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Original languageEnglish
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
Early online date15 Sep 2021
DOIs
Publication statusE-pub ahead of print - 15 Sep 2021

Abstract

A novel reflect array (RA) with ultra-low-profile and 2-bit phase quantization beam-steering ability is presented in this paper. To reduce the profile, a Leaky-wave feed is used to excite the RA with enhanced illumination efficiency. Moreover, simultaneous sum and difference patterns are also obtained to provide beam flexibility. The entire thickness of the proposed RA is less than 3% of that of the conventional front-fed RA with the same aperture. To increase the efficiency of the RA, a novel unit cell consisting of a polarizer layer and a reflection layer is developed, which is configured to provide polarization rotation and 2-bit phase shifts by using a hybrid of tunable polarization and discrete resonator. The operation principle, theoretical explanation, and implementation of the proposed antenna are elaborated in this work. To prove the design concept and beam scanning performance, an array with 9×7 unit cells operating atKa-band is designed and simulated firstly. 2-D beam scanning within the range of ±30º has been verified. Then, a passive prototype with 9×67 unit cells is designed, fabricated and measured. Experimental results show aperture efficiency of35.1% and illumination efficiency of 43.4%. The developed RA is scalable, and it provides a viable low-cost solution to develop low-profile, high-gain and beam-steering array antennas for satellite applications

Notes

© 2021 IEEE - All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1109/TAP.2021.3111172

ID: 25946761