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Slow-wave bandpass filters using ring or stepped-impedance hairpin resonators

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2 Author(s)
Lung-Hwa Hsieh ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Kai Chang

This paper proposes a new class of slow-wave bandpass filters that uses a microstrip line periodically loaded with microstrip ring or stepped-impedance hairpin resonators. The new slow-wave periodic structures utilize the parallel and series resonance characteristics of the resonators to construct a bandpass filter. Unlike conventional slow-wave filters, the proposed bandpass filters are designed to produce a narrow passband at the fundamental mode of the resonators. The new filters provide lower insertion loss than that of parallel- or cross-coupled ring and stepped-impedance hairpin bandpass filters. The calculated frequency responses of the filters agree well with experiments

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:50 ,  Issue: 7 )