A single-layer low-angle-pass filter based on metasurface

Abstract This paper presents the design and analysis of a low-angle-pass filter based on a single-layer metasurface for TE polarization. The designed angle filter comprises a metal pattern and a dielectric substrate. By properly designing the structure and dimensions, bandpass and band-stop are produced at the same frequency under normal and oblique incidences, respectively, resulting in excellent angular selectivity. Both simulation and experimental measurements of the sample are conducted for verification. The results exhibit remarkable angular selectivity, showing high transmission under normal incidence and low transmission under oblique incidence. The −3 dB angular bandwidth is only 8° and the overall thickness is only 1/4 wavelength. The introduced single-layer angular filter is suitable for various applications, including reducing co-channel interference in 5 G communication and energy harvesting.