Waveguide to suspended stripline transition techniques at 140 GHz

This paper describes the techniques for waveguide to suspended stripline transition as well as suspended stripline to waveguide transition. These transitions are used to realize crossbar mixers and band pass filters at 140 GHz. Back to back transitions with input/output waveguide WR-06 have been fabricated to measure insertion loss and return loss of the transition. Transitions have been simulated and tested for different orientations of excitation and probe shapes. Agilentpsilas ldquoAdvanced Design Systemrdquo and CST Microwave Studio have been used for simulation of the circuits.