POLARIZATION AGILITY OF SFCP MICROSTRIP ANTENNA WITH DIELECTRIC OVERLAY

This paper presents an investigation into the polarization behaviour o f a Single Fed Circularly Polarized (SFCP) square-shaped microstrip pa tch antenna covered with dielectric superstrate, Circular polarization is obtained using a coaxial feed and perturbation segments at the cor ners of the patch. A full wave analysis method based on the Mixed Pote ntial Integral Equation (MPIE) is used to predict impedance and polari zation behaviour of the antenna. Experimental results are presented an d show a good agreement with the theoretical results. A 7 % impedance bandwidth (for VSWR less than or equal to 2) and a 2 % ellipticity ban dwidth with a minimum axial ratio of 0.323 dB are obtained for this an tenna.