Review of Circular Polarization Techniques for Design of Microstrip Patch Antenna

Abstract

This paper is a review of the techniques used to generate circular polarized radiation with reference to the feeding techniques. Circular polarized antennas are increasingly gaining importance in wireless communication. The usable bandwidth is the overlap of axial ratio bandwidth and impedance bandwidth. Cross polarization is a measure of the polarization purity of circular polarized antenna. Dual circular polarization is the generation of both RHCP (Right handed circular polarized radiation) and LHCP (Left handed circular polarization) using the same antenna for either frequency reuse or diversity applications. Index Terms-Circular polarization, axial ratio, impedance bandwidth, single-feed, dual fed, orthogonal.