Full W -band Waveguide-to-microstrip Transition With New E-plane Probe

A design for waveguide-to-microstrip transitions at millimeter-wave frequencies is proposed in this letter. It features two major transformations in sequence. An E -plane probe is chosen to conduct the transformation from waveguide to a suspended line. Then, a transitional pattern on the printed circuit board is employed to transform the suspended line into a shielded microstrip line. To complete the design, a metallic buffer is introduced for the transformation between the shielded microstrip line and a microstrip line. A proposed transition at W-band is presented based on the results from numerical simulations. Two of the transitions in back-to-back connection are measured for the purpose of verification. The results show that the proposed waveguide-to-microstrip transition can offer the advantages of low insertion loss, good return loss, broadband nature, and stable performance at millimeter-wave frequencies.