Design of An Ultra-Miniature Substrate Integrated Waveguide Filter

Abstract

An ultra-miniature modified quarter mode substrate Integrated waveguide (QMSIW) resonator is proposed. The dominant resonant mode of the proposed resonator is TE₁₀₁ mode. The area of the modified QMSIW resonator is reduced by nearly 97.3% compared with the conventional full-mode SIW resonator. With the new coupling structures, the miniaturized resonator can be properly arranged in the filter design to minimize the footprint of the circuit. A novel filter using compact modified QMSIW cavity is designed, the proposed compact filter is fabricated to prove the predicted results in experiment, and good agreement is obtained.