US Patent 9825373 Monopatch antenna

A monopatch antenna system includes a ground plane, a patch antenna arranged parallel to the ground plane and having an aperture, and a monopole antenna extending perpendicularly to the ground plane through the aperture in the patch antenna. A feed system supplies a first portion of an RF signal to the patch antenna with a substantially circular polarization and simultaneously supplies a second portion of the RF signal to the monopole antenna with a linear polarization to produce a wide-beam composite antenna beam pattern having both linear and circular polarizations of the RF signal.