Wideband Transition from Tapered Microstrip to Corrugated SIW

In this paper, a wideband transition from tapered microstrip (TMS) to corrugated substrate integrated waveguide (CSIW) for Ku band application is presented. The design was initiated from a tapered microstrip to substrate integrated waveguide (SIW) transition and stubs are used at the feeding to improve impedance matching. Additionally, the CSIW implemented in the transition is meant for further size reduction, improved bandwidth, and reduced insertion loss. The measured fractional impedance bandwidth of 50 % (12-18 GHz) below -15 dB (simulated: -18 dB) has been achieved of the proposed transition. An insertion loss below 3 dB is obtained. The measured results are in agreement with the simulation results.