Dual-Band Substrate Integrated Waveguide Filters With Perturbed Circular Cavity

In this letter, a novel dual-band substrate integrated waveguide (SIW) filter with the perturbed circular cavity is presented. By introducing three kinds of metallic via perturbations combining different angles of feeding lines, five resonant modes TM 010 , TM 110 (a pair of degenerate modes), and T...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 32; no. 4; pp. 293 - 296
Main Authors Yang, Xian-Long, Zhu, Xiao-Wei, Wang, Xiang
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2022
Subjects
Circular cavity
Couplings
Dual band
Filtering theory
Passband
Perturbation methods
Resonant frequency
substrate integrated waveguide (SIW)
Substrates
via perturbation
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Summary:In this letter, a novel dual-band substrate integrated waveguide (SIW) filter with the perturbed circular cavity is presented. By introducing three kinds of metallic via perturbations combining different angles of feeding lines, five resonant modes TM 010 , TM 110 (a pair of degenerate modes), and TM 210 (a pair of degenerate modes) are perturbed to design the proposed filter. Thus, a dual-band filter with three transmission poles in the first passband and two transmission poles in the second passband is realized in a single circular cavity. Multiple transmission zeros are generated to increase the out-band performance. Then, a two-cavity dual-band filter is proposed by cascading two identical circular cavities, which shows better out-band suppression and return loss performance. The proposed dual-band filters are designed, fabricated, and measured in a standard printed circuit board (PCB) process at the <inline-formula> <tex-math notation="LaTeX">Q </tex-math></inline-formula>-band and the <inline-formula> <tex-math notation="LaTeX">V </tex-math></inline-formula>-band.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2021.3125098