Non-Bragg resonance in substrate integrated waveguide

Non-Bragg resonance in a SIW has been successfully demonstrated using theory, simulation, and experiment. Both simulation and measurement results show good agreement with the theoretical calculation with an offset in insertion loss, which is attributed in part to improper matching in transition from the microstrip feeding with a quasi TEM mode to the SIW structure with a TE mode. This kind of SIW with periodic walls can be applied in an integrated system requiring band rejection response.