Bandwidth-Enhancement of Low Profile Frequency Selective Surface Dual Layer Circular Polarizer

Abstract

This paper presents a low profile transmission type dual layer circular polarizer to obtain circular polarization for X-band applications. The FSS Polarizer is composed of two layers tilted at 450 along x, y-directions. In this research, significant technique is employed to obtain optimal bandwidth around resonant frequencies. Bandwidth widening with low loss transmission through the polarizer have been an important issue for researchers; therefore significant technique is employed to improve bandwidth widening of polarizer at operated frequencies. The simulation result shows that a right handed circular polarization (RHCP) and a left handed circular polarization (LHCP) are achieved at the resonant frequencies of 9.28 GHz and 11.23 GHz. The proposed structure achieves good circular polarization with low loss transmission and AR axial ratio is found between 9.14 GHZ and 11.58 GHZ i.e. 23.55% bandwidth.