Flat Meta-Reflector for Broadband Circularly Polarized Parabolic Antenna

A broadband flattened parabolic antenna based on a metasurface reflector that operates in right-handed circular polarization is proposed. The high directive antenna is intended for frequencies spanning from 10.7 GHz to 12.7 GHz in the Ku-band. The designed metasurface is composed of two layers of square patches printed on a grounded low loss dielectric substrate. The metasurface is illuminated by a broadband circularly polarized patch antenna placed at the focal point. The proposed concept is first validated numerically and then experimentally by measurements performed on a fabricated prototype. A highly directive beam is obtained in both simulation and measurement.