High Isolation and Low Cross-Polarization of Low-Profile Dual-Polarized Antennas via Metasurface Mode Optimization

Sihao LIU, Deqiang YANG, Yongpin CHEN, Xiaokun ZHANG, Yong XIANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

37 Citations (Scopus)

Abstract

A low-profile dual-polarized metasurface antenna with high isolation and low cross-polarization is proposed in this communication. The proposed metasurface consists of an array of 4times 4 patches. Through characteristic mode analysis (CMA), a pair of degenerate modes is identified to achieve the desired radiation features. By modifying the patches of the metasurface, the strongest mode current distributions of the two modes are moved from the center to the edge of the metasurface. One feed port can efficiently excite only one particular mode, and the other mode cannot be excited simultaneously. Each of the modes are differentially fed using two Y-shaped microstrip lines via two slots. As a result, both high isolation and low cross-polarization can be obtained. The simulation and experimental results show that the proposed antenna achieves not only a low profile of 0.05lambda _{0} (where lambda _{0} is the free-space wavelength at the center resonant frequency) but also a broad impedance bandwidth of 36% and a high isolation of 53 dB. In particular, the enhanced cross-polarization discrimination (XPD) is lower than -40 dB at the broadside, lower than -33 dB within ±30° of the main lobe, and lower than -28 dB within ±60° of the main lobe.

Original languageEnglish
Article number9228872
Pages (from-to)2999-3004
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Volume69
Issue number5
DOIs
Publication statusPublished - May 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1963-2012 IEEE.

Keywords

  • Dual-polarized
  • high isolation
  • low cross-polarization
  • low profile
  • metasurface

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