Anisotropic-Impedance-Surface-Based Broadband Dual-CP Polarization Optically Transparent Reflectarray Using Fine Metal Line

作者：Xi Wang Dai, Ze Li, Hanpeng Ruan, Weiliang Yu, Leilei Liu, Guo Qing Luo · 发表于：IEEE Antennas and Wireless Propagation Letters · 年份：2025 · DOI：10.1109/lawp.2025.3573874 · 被引用次数：5 · 研究领域：Advanced Antenna and Metasurface Technologies、Optical Coatings and Gratings、Near-Field Optical Microscopy

In this letter, a dual-circularly polarized (dual-CP) optically transparent reflectarray (RA) antenna operating in the Ka-band is proposed. The RA cell utilizes an anisotropic imped- ance surface (AIS) configuration and features an ultrathin profile of approximately 0.1125λ0. The RA element features highly effici- ent deflection of reflected waves without altering polarization properties. By adjusting size parameters and rotation angles, both dynamic phase and Berry phase can be applied, providing dual-CP phase compensation insensitive to incident angle. To validate this concept, the optically transparent RA antenna with independently controllable beamforming was designed, analyzed, and experimentally measured. Measurements show that the 3-dB gain bandwidth reaches 33.7% and 30.3% for Right-hand CP (RHCP) and Left-hand CP (LHCP) wave, respectively. And axial-ratio bandwidth (ARBW) reaches 53.3%. The antenna's gain and aperture efficiency (AE) attain 32.21/32.42 dBic and 32.6%/34.3% for CP incident waves.