Quad-band bandpass filter with controllable frequencies using asymmetric stub-loaded resonators

Gao, Li; Zhang, Yao; Xu, Jin-Xu; Zhao, Xiao-Lan

doi:10.1080/09205071.2017.1341347

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…However, this kind of BPFs is often hard to realize higher order responses and always suffers a large circuit size because of the inevitable great numbers of resonators. The third method we commonly adopted is to fully exploit the first several resonances of multimode resonators . However, they are usually limited by nonindependent coupling control and complicated structures.…”

Section: Introductionmentioning

confidence: 99%

“…The third method we commonly adopted is to fully exploit the first several resonances of multimode resonators. [16][17][18][19][20][21][22] However, they are usually limited by nonindependent coupling control and complicated structures. More importantly, it is often difficult to implement three or more transmission poles (TPs) in the passbands.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of four‐stage stepped‐impedance resonators and their application to quad‐band microstrip bandpass filter

Xie

Zhou

et al. 2019

Int J RF Microw Comput Aided Eng

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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.

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Section: Introductionmentioning

confidence: 99%