Design of a Dual-Polarized FSS with Wide Angular Stability and High Selectivity

This letter presents a wide angle and high selective bandpass frequency selective surface (FSS) based on meandering square slot resonators. The proposed FSS mainly consists of five square annular slots deployed in a three-layer structure. To elucidate the operating principle, an equivalent circuit model is constructed and analyzed. The results indicate the generation of a passband with three transmission poles (TPs) and two independently controllable transmission zeros (TZs). By applying this principle, three types of S-parameters with different frequency locations of TZs are achieved. One prototype was fabricated and measured, demonstrating that the proposed structure possesses attractive advantages such as wide passband, controllable TZs, polarization insensitivity, high selectivity, and stable performance at a maximum oblique incidence angle of 60°. © 2024 IEEE.