A Novel Dual-Band Bandpass Filter Using a Single Perturbed Substrate Integrated Waveguide Cavity

摘要

A novel dual-band bandpass filter based on the multimodes in a single perturbed substrate integrated waveguide (SIW) cavity is proposed. Metallized via-holes are introduced to serve as perturbations to shift and control the first four resonant modes and divide them into two groups. The perturbed TE_(101) and TE_(102) modes lead to the first passband while the perturbed TE_(201) and TE_(202) modes constitute the second passband. Furthermore, by moving the via-holes along the diagonal line of the SIW cavity, the first passband can be tuned independently while the second passband is fixed. A prototype filter operating at 9.22 GHz and 11.30 GHz is designed and fabricated. Measured and simulated results are presented to validate the proposed design concept of the dual-band filter.