A full Ka-band half height waveguide to microstrip transition

In this paper, a full Ka-band transition from half height rectangular waveguide to microstrip transmission line is designed and optimized. A stepped impedance microstrip probe is adopted to realize good impedance matching. By using ANSYS HFSS simulation and optimization, the designed transition has insert loss <; 0.25dB and return loss > 15dB during full Ka band. In the frequency band of 26.5 to 37GHz, insert loss is maintained below 0.15dB and return loss is maintained upon 20dB. This half height rectangular waveguide to microstrip transition not only has high performance but also has the advantage of much smaller size than conventional one, which may have potential applications in compact Ka-band integrated circuits and systems.