A Low-Profile Spin-Decoupled Folded Reflectarray Antenna With Dual-Circularly Polarized Beams

作者：Dajun Ding, Wu Ren, Zhenghui Xue, Weiming Li · 发表于：IEEE Antennas and Wireless Propagation Letters · 年份：2025 · DOI：10.1109/lawp.2024.3525024 · 被引用次数：6 · 研究领域：Advanced Antenna and Metasurface Technologies、Antenna Design and Analysis、Metamaterials and Metasurfaces Applications

In this letter, a low-profile spin-decoupled folded reflectarray antenna (SDFRA) with dual-circularly-polarized beam control is proposed, which can realize spin angular momentum (SAM) decoupling. Impressively, the substrate used in this antenna is reduced to 3 layers. The proposed SDFRA consists of a receiver-transmitter metasurface (RTMS), a polarization conversion reflection metasurface (PCRM), and a magneto-electric (ME) dipole antenna. Specifically, the RTMS can reflect thex-polarized waves and transmit its orthogonal polarization waves. Meanwhile, the transmitted waves can be decomposed into left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) waves. To confirm the concept, a prototype is fabricated and measured. The results indicate that the 3-dB gain bandwidth of the LHCP beam and the RHCP beam are 20.89% and 21.3%, respectively. The maximum realized gain of the LHCP and RHCP beams are 20.55 dBic and 20.52 dBic, corresponding to aperture efficiencies of 19.06% and 19.19%. The experimental results are in good agreement with the simulated results. With the advantages of broadband, low profile, and low cost, this antenna provides an effective solution for single-band dual-circularly polarized beam control.