Compact dual-band balanced bandpass filter based on circular SIW cavity

Sheng Zhang; Chao Ji; Meng-Han Tong; Zhen-Jiang Xie; Cong Xu

doi:10.1515/freq-2020-0197

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Compact dual-band balanced bandpass filter based on circular SIW cavity

Sheng Zhang , Chao Ji , Meng-Han Tong , Zhen-Jiang Xie und Cong Xu

Veröffentlicht/Copyright: 14. Juni 2021

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Aus der Zeitschrift Frequenz Band 75 Heft 9-10

Abstract

A compact dual-band balanced bandpass filter with high frequency selectivity and adjustable passband based on the perturbed circular substrate integrated waveguide cavity is firstly proposed in this paper. Two pairs of metallic vias are located at 45°direction of cavities to separate a pair of degenerate modes (TM₁₁₀ modes) to achieve the differential-mode (DM) dual-band response. Moreover, the perturbation vias can also be used to control the center frequency of the second DM passband while the first one still stays unaffected. The introduction of source-load coupling makes the filter exhibit excellent selectivity. And four controllable transmission zeros appear near two DM passbands. Finally, good common-mode suppression has been got owing to the proposed balanced structure. The measured results are in accordance with the simulated ones well.

Keywords: balanced filter; circular substrate integrated waveguide (SIW); degenerate modes; dual-band bandpass filter (BPF)

Corresponding author: Chao Ji, The School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China, E-mail: jichao@cumt.edu.cn

Funding source: The Fundamental Research Funds for the Central Universities

Award Identifier / Grant number: 2019GF12

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work is supported by the Fundamental Research Funds for the Central Universities 2019GF12.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-11-10

Accepted: 2021-05-31

Published Online: 2021-06-14

Published in Print: 2021-10-26

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https://doi.org/10.1515/freq-2020-0197

Schlagwörter für diesen Artikel

balanced filter; circular substrate integrated waveguide (SIW); degenerate modes; dual-band bandpass filter (BPF)