A Polarization-Insensitive Miniaturized Element Frequency Selective Surface using Meander Lines

Abstract

In this paper, a polarization-insensitive frequency selective surface (FSS) made of miniaturized elements has been presented. The proposed FSS structure is comprised of convoluted meander line geometries printed on both sides of an ultra-thin dielectric substrate. The design exhibits a bandpass response at 1.25 GHz corresponding to the unit cell dimension of $0.042\lambda_{0}\times 0.042\lambda_{0}$ only, where $\lambda_{0}$ represents the free space wavelength at the centre frequency. The novelty of the structure lies in its improved miniaturization performance as compared to the earlier reported spatial filters. Furthermore, the designed FSS is angularly stable upto incident angle of 60°. The proposed structure has also been fabricated and experimentally verified under normal incidence.