45–110 GHz quad-ridge horn antenna

A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half power beamwidth (HPBW) is discussed. Multi-step flaring and corrugations on a finite ground plane are applied to achieve required stable gain above 16 dBi from 45 to 110 GHz. The computational studies conducted in HFSS are verified with CST and it is demonstrated that the designed antenna achieves gain variation <; 2 dB, VSWR <; 2:1, difference in E-H plane HPBWs of <; 10°, and acceptable patterns over the entire frequency band.