Novel Broadband FSS Dual-Layer Circular Polarizer Based on Quarter Wave Plate

Abstract

A broadband FSS dual-layer circular polarizer based on quarter wave plate is proposed which is composed of two ultrathin periodic metallic strips and comprehensively investigated that can convert the linear polarized wave into circularly polarized wave under the normal incidence of x-linearly polarized wave over dual bands. The two transmitted linear vector components possess the equal amplitudes and ±900 phase difference around the frequency bands. This means the transmitted waves are achieved with right handed circular polarization and left handed circular polarization at resonance frequencies. The two ultrathin periodic metallic strips are printed on the top and bottom surfaces of two dielectric substrates along x, y direction which are subjected to broaden the axial ratio bandwidth at frequency bands. Moreover, the accumulated axial ratio bandwidth of single and dual-layer polarizer is achieved of 5.14% and 14.11% over the frequency bands for circular polarization.