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Analysis of four‐stage stepped‐impedance resonators and their application to quad‐band microstrip bandpass filter
Author(s) -
Xie HaoWei,
Zhou Kang,
Zhou ChunXia,
Wu Wen
Publication year - 2020
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22116
Subject(s) - passband , band pass filter , resonator , microstrip , electrical impedance , acoustics , coupling (piping) , topology (electrical circuits) , physics , electronic engineering , filter (signal processing) , prototype filter , computer science , materials science , engineering , optics , low pass filter , electrical engineering , metallurgy
Four‐stage stepped‐impedance resonator (FSSIR) is proposed and its resonant characteristics are analyzed in detail. The formulas of the first four resonances are deduced and the optimization techniques are presented on the basis of the impedance ratios. A quad‐band bandpass filter with third‐order filtering response in each passband is synthesized and designed as a demonstration of the application of the proposed FSSIR. Thanks to the cross‐coupling topology and skew‐symmetrical feeding configuration, multiple transmission zeros have been generated out of the passbands. Additionally, the frequency and the couplings of each passband can be flexibly controlled, respectively.