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.

Design of a Ka-band low loss circularly polarized omni-directional slot array antenna is presented. The slot array is conformal on a circular waveguide and the slots are radiating into a parallel plate region for circular polarization. Elevation beam is directed to +10 degrees for the required elevation coverage of -10°/+30°. Simulation results show that the return loss is better than 20 dB in 1% bandwidth. Gain of the antenna greater than 1 dBi and the axial ratio better than 4.2 dB in the full sector of coverage.I.

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