APPLICATIONS OF BROADBAND CIRCULARLY POLARIZED MICROSTRIP ANTENNA (CPMA): A COMPREHENSIVE REVIEW

Abstract

This letter introduces a circularly polarised dual-band patch antenna dedicated to satellite communications. By inserting a small X-band microstrip patch antenna into a big L-band one, the dual-band behaviour is obtained. Both patches are printed on the same substrate and fed into two perpendicular slots etched into their ground planes by electromagnetic coupling. Two separate 90 microstrip branch-line couplers printed on a stacked lower substratum feed these slots. With a 1.5 mm-thick upper layer substrate and a 0.758 mm-thick feed layer substrate, all of the same dielectric material with a relative permittivity of  = 2 22, a prototype of the antenna was realised. In terms of frequency bandwidth, circular polarisation bandwidth, and separation between the two communication bands, simulation and measurement results are provided, showing that this compact dual-band antenna achieves the necessary Meteosat specifications.