Wideband Highly-Transparent Broadbeam Circularly Polarized Antenna

This paper proposes a wideband highly-transparent broadbeam circularly-polarized (CP) antenna. The antenna consists of a coplanar waveguide (CPW) T-shaped feed structure to achieve wideband performance. To generate CP, a grounded rectangular patch is placed inside the slot area. The antenna uses diamond-shaped meshes and is fabricated on a glass substrate for optical transparency (OT). Simulated results show a usable CP bandwidth of 33.61% (1.98 GHz-2.78 GHz), an OT of 73.47%, and broad CP beams of 119° are obtained.