A Millimeter-Wave Filtering Fabry–Pérot Cavity Antenna

This letter introduces a novel filtering technique for designing a millimeter-wave (mmw) Fabry–Pérot cavity (FPC) antenna. The letter introduces a new surface combining a high dielectric layer, air layer and FSS layer, forming the proposed partially reflective surface with frequency selectivity (PRSFS). Unlike traditional partially reflective surface (PRS) in FPC, the proposed PRSFS not only functions as a PRS, contributing to a high-gain FP antenna, but also functions as a frequency selective surface (FSS) for transmitting waves, resulting in a bandpass filtering response with high-frequency selectivity. For demonstration, a 60 GHz filtering FPC antenna is implemented. Compared to the recently reported filtering FP-type antenna, the proposed antenna yields higher levels of performance such as operating frequency (60.5 GHz), antenna gain (17.7 dBi) and out-of-band rejection level (15.2 dB). The proposed filtering antenna is a potential choice for millimeter-wave communications.