Performance of a planar filter using a 0° feed structure

Author

Tsai, Chih-Ming ; Lee, Sheng-Yuan ; Tsai, Chin-Chuan

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

50

Issue

10

fYear

2002

fDate

10/1/2002 12:00:00 AM

Firstpage

2362

Lastpage

2367

Abstract

The advantage of using a 0° feed structure in filter design is that two extra transmission zeros are created in the stopband while the passband response remains unchanged. This feed structure is analyzed by using transmission matrices. A new lumped-circuit model for a coupled resonator filter is then proposed to take into account the effects of this feed structure. Finally, the feed structure is applied to the design of a cross-coupled filter. All the theoretical analysis and design procedures have been successfully verified by experiment results.

Keywords

Butterworth filters; coupled circuits; coupled transmission lines; lumped parameter networks; microwave filters; poles and zeros; resonator filters; transmission line matrix methods; 0° feed structure; coupled resonator filter; cross-coupled filter; filter design; lumped-circuit model; passband response; planar filter; second-order Butterworth filters; stopband rejection; transmission matrices; transmission zeros; Coupling circuits; Feeds; Filtering theory; Magnetic separation; Microwave filters; Passband; Resonator filters; Transmission line matrix methods; Transmission line theory; Transmission lines;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2002.803421

Filename

1038876