Millimeter-Waves Broadband Coplanar-to-Rectangular Waveguide Transition

In the millimeter wave system integration, the transition structure from the planar transmission line to the rectangular waveguide is an important structure between the microstrip antenna and the transceiver component. This contribution proposes a simple broadband vertical transition structure between coplanar waveguide and WR10 rectangular waveguide, which is composed of a metal bottom block, a coplanar waveguide high-frequency printed circuit board and a standard rectangular waveguide. The standard rectangular waveguide is directly covered and pressed on top of the printed circuit board, so that the transition structure can be engrain to diverse planar integrated circuits without compromising the integrity of the planar structure. Modeling and simulation of the transition structure are implemented through electromagnetic simulation software HFSS. The measurement of the "back-to-back" structure shows the insertion loss less than 2dB from 88GHz to 108GHz, and the -10dB bandwidth is greater than 20%.