Planar single-/dual-band bandpass filters based on new perturbed multi-mode SIW circular cavity

Weihao Zhang, Shuai Ding, Yongmao Huang, Zhaojun Zhu, Wei He and Maurizio Bozzi

Journal of Electromagnetic Waves and Applications, 2023, vol. 37, issue 3, 323-334

Abstract: In this paper, new single- and dual-band bandpass filters are implemented based on the perturbed multi-mode substrate integrated waveguide (SIW) circular cavity. For the single-band filter, the TM $ _{010} $ 010 mode, TM $ _{110A} $ 110A mode, and TM $ _{210A} $ 210A mode are simultaneously utilized to realize the triple-mode resonance response, of which both the bandwidth and central frequency can be flexibly adjusted by allocating the perturbation position properly. Meanwhile, for the dual-band operation, the TM $ _{010} $ 010 mode, TM $ _{110A} $ 110A mode, and TM $ _{210A} $ 210A mode are arranged to realize the lower passband, whereas the TM $ _{210B} $ 210B and TM $ _{020} $ 020 modes are excited to generate the upper passband. The working principle of the filters' coupling topology is explained in detail. For concept verification, both the triple-mode single-band and multi-mode dual-band filters are designed, manufactured and measured, with the measurement results are separately in good agreement with the corresponding simulations.

Date: 2023
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DOI: 10.1080/09205071.2022.2136040

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