Circularly polarized Ka-band waveguide slot array with low sidelobes

A novel, circularly polarized waveguide slot antenna element is designed. The slot combines circular polarization with the flexible excitation amplitude control of the classical broad wall slots. Characterization curves are obtained for the slot using the unit cell approach. Both a low sidelobe linear array and a planar array are designed and simulated using the characterization data at Ka-band. The radiation pattern measurement results for the linear array are provided.