Design of Dual-Polarized Dual-Band Unit-Cell for Wideband FSS in Ku Band

Abstract

This paper proposes a dual-polarized frequency selective surface (FSS), designed in Ku and K bands which can be used as passband multilayer spatial filter. This design consists of double-sided unit-cells comprising a cross-dipole and a stubbed square loop, arranged in a square lattice. The three-layer broadband (35% to 45%) dual-polarized FSS is realized using this unit-cell with low transmission coefficient (better than -0.2 dB) and excellent ripple-free bandpass which corresponds to Butterworth filter response. Full-wave analysis demonstrated a dual-polarized, dual-band capability with an independent stable frequency response control in the aforementioned band in x- and y-polarizations, making it a good candidate for broadband dual-polarized microwave and optic applications.