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

Author

Chen, Cheng-Chung ; Chen, Yi-Ru ; Chang, Chi-Yang

Author_Institution

Inst. of Electr. Commun. Eng., Nat. Chiao Tung Univ., Taiwan, Taiwan

Volume

51

Issue

1

fYear

2003

fDate

1/1/2003 12:00:00 AM

Firstpage

120

Lastpage

131

Abstract

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.

Keywords

coupled circuits; elliptic filters; microstrip filters; resonator filters; coupling phase; flat group-delay response; microstrip cross-coupled filters; quarter-wave resonators; quasi-elliptical response; quasi-quarter-wave resonators; Chebyshev approximation; Couplings; Filtering theory; Frequency; Helium; Microstrip filters; Microstrip resonators; Nonlinear filters; Resonator filters; Shape;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2002.806924

Filename

1159674