Full‐band transition from substrate integrated waveguide to rectangular waveguide

A novel substrate integrated waveguide to rectangular waveguide (RWG) transition for effective power transfer is proposed. The substrate taper is inserted into a conventional height‐stepped impedance transformer of the RWG region to improve transmission loss and bandwidth. The transition is designed to cover the entire K‐band (18–26 GHz), showing a return loss of 20 dB. A back‐to‐back transition has been fabricated to verify the proposed transition. The experimental results show good agreement with the analysis. The transmission loss of the stand‐alone transition is 0.22 dB at 21.7 GHz with a usable bandwidth of 36%.