Investigations on frequency agile dual polarization dielectric lens high gain antenna

A dual polarized high gain dielectric lens antenna with frequency agility from 20.8 GHz to 25.4 GHz is proposed. A plano-convex dielectric lens is used to focus the beam from the patch antenna in the forward direction resulting in higher realized gain. Co-pol and cross-pol separation of 15 dB for both polarizations is reported in the forward direction. In this antenna design, variable capacitors are implemented along the four corners of the patch to tune the operational frequency in the K-band while still maintaining the radiation pattern symmetry with respect to both the feeding ports.