Millimeter-Wave Single-Layer Full-Band WR12 Vertical Waveguide Transition

In this paper the Nippon Pillar’s low-loss substrate material F300AS is utilized to implement a planar single-layer substrate-integrated waveguide (SIW-) based vertical waveguide transitions to cover the full WR12 band. Two designs are implemented on thin and thick substrate to seek the maximum obtainable bandwidth. The SIW-WR12 transition comprises of rectangular aperture and two via pairs to widen its bandwidth. The simulated 1-dB bandwidth spans from 60-88 GHz on the thick substrate. The transition is directly mounted on the board and it does not require additional mechanical parts for fixation. Back-to-back structures were fabricated and measured for verification.