Design of broadband dual‐polarised reconfigurable frequency selective surface based on dual‐branch parallel circuit model

Abstract

A broadband dual-polarised reconfigurable frequency selective surface (RFSS) based on general dual-branch parallel circuit model is proposed by the authors. The specific circuit model is constructed to feature the switchable functions of transmission and reflection characteristics by introducing a parallel branch. It is beneficial to clarify the operating mechanism and provide an effective guidance to satisfy the switching bandwidth requirements of the desired RFSS. In order to validate the proposed concept of the dualbranch parallel circuit model, a broadband dual-polarised RFSS prototype has been designed, fabricated and measured. A satisfactory agreement can be reached between the synthesis, simulation and measurement. The experimental results exhibit the merits of low insertion loss, broad switching bandwidth and good angular stability for different polarisation and different incident angles.