A Compact PCB Gasket for Waveguide Leakage Suppression at 110-170 GHz

An electromagnetic bandgap (EBG) structure is implemented on a printed-circuit board (PCB) as gasket between waveguide flanges. The proposed gasket can reduce leakage between waveguide flanges due to mis-alignment. A WR-6.5 waveguide proof of concept demonstration is presented in this paper covering 110-170 GHz with a return loss lower than -12 dB with over 75 um air gap between flanges.