Linearly and circularly polarised Bull's eye antenna

摘要

In this paper a design of linearly and circularly polarised Bull's Eye antenna is presented. The proposed antenna consists of two identical rectangular slots in a shape of cross surrounded by symmetric periodic grooves drilled in the surface of metallic plate. The antenna can operate on vertical, horizontal and circular polarisation over its entire bandwidth. It resonates at 14.8 GHz and it has a simulated impedance bandwidth of 11% with achieved gain and side lobe level of 17.8 dBi and 15 dB, respectively.