Wideband Circularly Polarized Antenna on Glass Substrate with High Optical Transparency

In this paper, a wideband circularly polarized antenna on a glass substrate with high optical transparency is presented. The antenna uses a coplanar-waveguide-fed rectangular patch which is shorted to the ground for circular polarization. High optical transparency is obtained by using the glass substrate and mesh structure instead of the conventional dielectric laminate substrate and solid patch. Results confirm that similar performance is observed with solid and mesh antennas. The proposed transparent antenna with a fill factor of 0.2, shows a wide -10 dB impedance bandwidth of 28.6% and a 3-dB axial ratio bandwidth of 31.1%.