Effects of coaxial probe dimensions on broadband transition to substrate integrate waveguide

The effect of probe dimensions on the excitation of substrate integrated waveguide (SIW) in thick substrate in X (8- 12 GHz) and Ku (12-18 GHz)-frequency band is presented. The SIW is excited by a standard SMA connector and with K-connector and their performances are compared. The proposed transition is simulated using Ansof HFSS. The simulated bandwidth (S11<; -20dB) for standard SMA-to-SIW back-to-back transition is 38.65% and for the K-connector-to-SIW back-to-back transition it is improved up to 61.81%.