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Design of microstrip filter based on slow‐wave open‐loop resonator
Author(s) -
Zhang XiaoChuan,
Xu Jun,
Yu ZhiYuan,
Dong YuLiang
Publication year - 2009
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.24232
Subject(s) - passband , resonator , filter (signal processing) , band pass filter , microstrip , electronic engineering , microwave , physics , loop (graph theory) , acoustics , prototype filter , butterworth filter , engineering , filter design , topology (electrical circuits) , optoelectronics , electrical engineering , telecommunications , mathematics , combinatorics
A microstrip bandpass filter implemented with slow‐wave open‐loop resonators is described in this article. The slow‐wave open‐loop resonators make the filter compact and allow the implementation of positive and negative inter‐resonator couplings. Implementation of the positive and negative couplings is used to introduce a pair of finite frequency transmission‐zeros in the filter response. The two zeros are designed to be close to the passband, thus improving the selectivity of the filter. As an example, a fourth‐order cross‐coupled filter is fabricated. The experimental results are demonstrated and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1057–1060, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24232