Fabrication and performance of broadband back to back waveguide to suspended stripline transition on quartz for D-band

A back to back waveguide to suspended stripline transition for D-band has been fabricated on 2 mil (50.8 mm) fused quartz substrate by photolithography process and the performance of the transition has been studied. The excitation of transition probe has been done by placing the rectangular probe transversely across the WR6 waveguide and using a 50 mm fixed short. To obtain low reflections over the whole operating frequency range of the transition, dimensional parameters, such as probe length, probe width, width and height of suspended stripline channel and thickness of quartz substrate have been optimized using electromagnetic simulation software HFSS. Insertion loss of less than 1.5 dB has been achieved for fabricated back to back transition on quartz over frequency range from 130 to 150 GHz.