Novel broadband millimeter-wave FLAPS reflector antenna with three types elements

A novel broadband millimeter-wave FLAPS reflector antenna with three types elements has been presented. The progressive phase shift is achieved by square-annular patches, combined patches and rectangle patches. The choice of this three types elements can make the phase shift smoother and increased up to 360°. Using this technique, a 15°-beam-steering FLAPS reflector antenna operating at 95 GHz is designed. The calculated results demonstrate the agreement of the main beam steering with the design requirement, and a 1-dB gain bandwidth close to 17% is obtained.