Compact Quadruple-Mode Wideband Bandpass Filter Using L-Shaped Feed-Line in a Single Cavity

This letter presents a novel quadruple-mode cavity wideband bandpass filter (BPF). Unlike the conventional coaxial cavity resonator, the proposed cavity resonator is made up of two symmetrical conductive posts in a cylindrical cavity, while four resonant modes of the cavity resonator are classified...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2021-10, Vol.31 (10), p.1111-1114
Main Authors: Zhang, Zhi-Chong, Wong, Sai-Wai, Yu, Xuzhou, Zhao, Bingxiong, Wang, Diji, Chen, Ruisen
Format: Article
Language:English
Subjects:
Band-pass filters
Bandpass filter (BPF)
Bandpass filters
Broadband
cavity
Cavity resonators
Filtering theory
L-shaped feed-line
Microwave filters
Microwave theory and techniques
quadruple-mode
Resonant frequency
Resonator filters
Wideband
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Summary:This letter presents a novel quadruple-mode cavity wideband bandpass filter (BPF). Unlike the conventional coaxial cavity resonator, the proposed cavity resonator is made up of two symmetrical conductive posts in a cylindrical cavity, while four resonant modes of the cavity resonator are classified as TM 01 mode, TM 11 mode, and a pair of TE degenerate modes (TE+ mode and TE− mode). All of the four modes are excited by a pair of L-shaped feed-lines. In addition, the four resonant modes are employed to constitute the passband of wideband BPF with a fractional bandwidth (FBW) of 45% at the central frequency of 2.2 GHz. Finally, the proposed filter is designed and fabricated. Good in-band filtering performance, wide upper stopband, and compact size are realized.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2021.3107952