A REVIEW PAPER ON DUAL BAND CIRCULARLY POLARIZED MICROSTRIP ANTENNA (CPMA)

Abstract

This paper discusses the techniques used in regard to the feeding techniques to produce circular polarised radiation. In wireless communication, circular polarised antennas are rapidly gaining significance. The usable bandwidth is the overlap of the bandwidth of the axial ratio and the bandwidth of impedance. Cross polarisation is a measure of the purity of circular polarised antenna polarisation. The generation of both RHCP (Right Handed Circular Polarized Radiation) and LHCP (Left Handed Circular Polarization) using the antenna for either frequency reuse or diversity applications is double circular polarisation. There are several techniques for the designing of circularly polarized microstrip antennas to improve the desired level of performance parameters like resonance frequency, gain, directivity, radiation efficiency and antenna efficiency for the dual resonance. This letter describes circularly polarized microstrip antennas, literature review, simulation software’s, advantages and disadvantages over conventional microwave antennas and applications. This letter also presents the comparative study of several circularly polarized microstrip antenna design methods used by researchers.