Single feed circularly polarized edge truncated elliptical microstrip antenna

The radiation performance of a modified single feed circularly polarized elliptical patch microstrip antenna is simulated on glass epoxy FR-4 substrate by applying IE3D simulation software and its performance is compared with that of a conventional elliptical patch antenna. Both edges of geometry parallel to its major axis are truncated and antenna is fed at a point lying on the line making an angle of 45° from the minor axis. The location of feed point on this line and width of truncated parts are optimized to obtain improved circular polarization performance with this structure. The simulated return loss, input impedance, axial ratio variations with frequency for the proposed antenna are reported in this communication. The E and H plane LHCP and RHCP radiation patterns are also presented. It is realized that the impedance bandwidth and axial ratio bandwidth of modified antenna are improved on proposed truncations in the edge.