Circularly Polarized Antenna based on Spoof Surface Plasmon Polaritons using Artificial Ground Plane

In this paper, a circularly polarized highly efficient broadside antenna based on spoof surface plasmon polaritons (SSPPs) using polarization dependent artificial ground plane (AGP) is proposed. Printed monopole is used to excite even mode of SSPPs in 45° rotated corrugated strip relative to ground plane. The field from the resonating even mode and reflected field from the polarization dependent artificial ground plane contribute for circular polarization in broadside direction. The proposed antenna offers 10-dB input impedance bandwidth and 3-dB axial ratio bandwidth (ARBW) of 15.3% and 11.7% (at 3.42 GHz center frequency) in broadside direction with right hand circular polarization (RHCP), respectively. The minimum axial ratio achieved is 0.39 dB. The total efficiency remains above 92.4% over 3-dB ARBW, while maximum total efficiency achieved is 98.4%. The proposed antenna provides very low cross polar component with maximum gain value of 7.17 dBic in broadside direction.