High CM suppression wideband balanced microstrip BPF using dual-mode resonator

ABSTRACT In this letter, a novel high selectivity and common‐mode (CM) suppression wideband balanced microstrip passband filter (BPF) is proposed using the short stub centrally loaded short‐ended resonators (SSCLSR). The odd‐mode resonant frequency of the SSCLSR can be flexibly controlled by the sho...

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Bibliographic Details
Published in:Microwave and optical technology letters 2014-12, Vol.56 (12), p.2940-2944
Main Authors: Deng, Hong-Wei, Zhao, Yong-Jiu, He, Ying, Liu, Hao, Wang, Hong-Li
Format: Article
Language:English
Subjects:
balanced filter
Balancing
Circuits
differential-/common-mode
dual-mode resonator
Equivalence
high common-mode suppression
Joining
Microwaves
Resonators
Simulation
Wideband
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Summary:ABSTRACT In this letter, a novel high selectivity and common‐mode (CM) suppression wideband balanced microstrip passband filter (BPF) is proposed using the short stub centrally loaded short‐ended resonators (SSCLSR). The odd‐mode resonant frequency of the SSCLSR can be flexibly controlled by the short stub, whereas the even‐mode one is fixed. First, the wideband single‐ended BPF are designed based on the microstrip SSCLSR with the parallel coupled microstrip line input/output (I/O). Two transmission zeros near the passband edges can be generated due to the main path signal counteraction and source‐loaded coupling. Further, the CM equivalent half circuits of the balanced BPF based on the wideband single‐ended BPF are investigated in detail. Thus, a wideband balanced BPF with high CM suppression within the passband is designed, fabricated, and measured. Good agreement between simulated and measured results is obtained. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2940–2944, 2014
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.28739