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Analysis and Design of a W-Band Circular Polarized Feed Horn with Inbuilt Polarizer for Low f/D Offset Reflector Antenna

A novel W-band left-hand circular polarized (LHCP) cylindrical waveguide feed horn antenna is proposed. The circular polarized wave is generated in the internal polarizer structure by 9 pairs of circular cavities, eliminating the need for an orthomode transducer or a complex septum. The proposed horn antenna’s dimension is 26 mm × 14 mm × 5.25 mm. The antenna has impedance matching (S11 < -15 dB) and axial ratio below 1.2 dB from 79.5 GHz to 88 GHz. The horn is used as a feed source for an offset parabolic reflector of 10 cm diameter and low f/D ratio 0.25. The measurement of the prototyped feed horn and the offset parabolic reflector antenna validates the analysis and simulation results.