US Patent 10923831 Waveguide-fed planar antenna array with enhanced circular polarization

A waveguide fed planar antenna array with enhanced circular polarization (“WFAECP”) is disclosed. The WFAECP includes a plurality of dielectric layers forming a dielectric structure, an inner conductor formed within the dielectric structure, a first patch antenna element (“PAE”), a second PAE, a bottom and top conductor, a conductive via in signal communication with the bottom and top conductor, a first and second antenna slot within the first PAE and second PAE, and a waveguide. The dielectric layers includes top and bottom dielectric layers, where the top dielectric layer includes a top surface and the bottom dielectric layer includes a bottom surface. The first PAE is formed on the top surface of the top dielectric layer and the second PAE is formed on the bottom surface of the bottom dielectric layer. The waveguide includes a waveguide wall, backend, and cavity. The second PAE is located within the waveguide cavity.