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Miniaturized microstrip cross-coupled filters using quarter-wave or quasi-quarter-wave resonators

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3 Author(s)
Cheng-Chung Chen ; Inst. of Electr. Commun. Eng., Nat. Chiao Tung Univ., Taiwan, Taiwan ; Yi-Ru Chen ; Chi-Yang Chang

Miniaturized microstrip filters using quarter-wave or quasi-quarter-wave resonators with cross-coupling are presented. The quarter-wavelength resonators enable very compact positively or negatively cross-coupled filters to be realized. The combination of quarter-wave and quasi-quarter-wave resonators facilitates the cross-coupling with a proper coupling phase. A new explanation for the coupling phase between the main-coupling and cross-coupling paths is proposed. Different filters that use the proposed resonators are realized and may have either quasi-elliptical or flat group-delay responses. Measurement results correlate well with theoretical predictions.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:51 ,  Issue: 1 )

Date of Publication:

Jan 2003

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