论文信息 - A novel coupling structure suitable for cross-coupled filters with folded quarter-wave resonators

A novel coupling structure suitable for cross-coupled filters with folded quarter-wave resonators

A new class of coupling structure for cross-coupled filters with folded quarter-wave resonators is presented. The cross coupling mechanism is realized by magnetic coupling from the short ends of the resonator. The proposed magnetic coupling solves the problem of response limitation of folded quarter-wave resonator cross-coupled filters that were introduced previously using electrical cross coupling. Several quadruplet and trisection filters are proposed and fabricated. The measured results matched well with the theoretical prediction.

Chi-Yang Chang | Cheng-Chung Chen

[1] Chi-Yang Chang,et al. Miniaturized microstrip cross-coupled filters using quarter-wave or quasi-quarter-wave resonators , 2003 .

[2] Michael J. Lancaster,et al. Cross-coupled microstrip hairpin-resonator filters , 1998 .

[3] Jia-Sheng Hong,et al. Microstrip cross-coupled trisection bandpass filters with asymmetric frequency characteristics , 1999 .

[4] R. R. Bonetti,et al. Generalized dual-plane multicoupled line filters , 1993 .

[5] Michael J. Lancaster,et al. Theory and experiment of novel microstrip slow-wave open-loop resonator filters , 1997 .

[6] R. Levy,et al. Direct synthesis of cascaded quadruplet (CQ) filters , 1995, Proceedings of 1995 IEEE MTT-S International Microwave Symposium.

[7] R. J. Cameron,et al. Fast generation of Chebyshev filter prototypes with asymmetrically-prescribed transmission zeros , 1982 .

[8] Raymond S. Kwok,et al. Characterization of high-Q resonators for microwave filter applications , 1999 .

[9] Chi-Yang Chang,et al. Folded quarter-wave resonator filters with Chebyshev, flat group delay, or quasi-elliptical function response , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).