A Dual-Polarized Reconfigurable Reflectarray with A Thin Liquid Crystal Layer and 2D Beam Scanning

Peyman Aghabeyki, Yang Cai, Guangsheng Deng, Zheng-Hua Tan, Shuai Zhang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

14 Citations (Scopus)
428 Downloads (Pure)

Abstract

A novel approach for dual-polarized liquid crystal (LC) unit cell design is introduced, allowing significant thickness reduction of an LC layer without compromising its loss and phase shift. For each unit cell, LC is used for a tunable superstrate between a cross patch above and a square patch below. The square and cross patches are coupled through two slots for each polarization. By changing the voltage applied to the square and cross patches, the LC in-between varies the resonant frequency and phase of the unit cell to realize 2-D beam steering. 10× 10 dual-polarized reflectarray (RA) with 30μ m (0.0028 λ ) and 4μ m (3.73× 10-4λ ) thick LC layers are simulated in the 28 GHz band, where the aperture efficiencies (AE) are 25.3% and 22.5%, respectively. As a proof of concept, the dual-polarized RA with 30μ m thick LC is fabricated manually and measured at 28.5 GHz. A measurement technique is proposed to obtain the phase curves of the RA and reduce the effect of fabrication errors. With the imperfect manual fabrication, the RA still achieves the measured realized gain of 14.6 dBi corresponding to 12.5% AE. Besides, ±45° beam steering is demonstrated in the 2-D plane for both polarizations.

Original languageEnglish
JournalI E E E Transactions on Antennas and Propagation
Volume71
Issue number4
Pages (from-to)3282-3293
Number of pages12
ISSN0018-926X
DOIs
Publication statusPublished - 1 Apr 2023

Keywords

  • Beam-steering
  • dual polarization
  • liquid crystal (LC)
  • reflectarray (RA)
  • response time

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