A source-load coupled bandpass filter using one-eighth mode substrate integrated waveguide cavity

A novel compact eighth-mode substrate integrated waveguide (EMSIW) resonator is proposed. The dominant resonant mode of the proposed resonator is TE₁₀₁ mode. Compared with the conventional SIW resonator, the size reduction of the resonator is up to more than 87.5%. By using source-load Cross coupling and magnetic coupling, a new filter with two EMSIW cavities is designed, which has four transmission zeros in the out-band. The measured results show good performance and agree well with the simulated results.