Conductor loaded resonator filters with wide spurious-free stopbands

Author

Wang, Chi ; Zaki, Kawthar A. ; Atia, Ali E. ; Dolan, Tim G.

Author_Institution

Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA

Volume

45

Issue

12

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

2387

Lastpage

2392

Abstract

A new configuration of conductor loaded resonator filters using two different size conductor loaded resonators and enclosures with significantly improved spurious performance Is presented. A rigorous mode-matching method is used to compute the resonant frequencies, unloaded Q, and the fields of the resonant modes of the conductor (solid or ring) loaded resonators. The coupling coefficients between two resonators are computed using small aperture coupling theory. The stopband characteristics of the filter are investigated. An eight-pole elliptic-function filter was designed, constructed, and tested. Extremely wide spurious-free stopband filter response was obtained which verified the theory

Keywords

Q-factor; band-stop filters; elliptic filters; mode matching; resonator filters; conductor loaded resonator filters; coupling coefficients; eight-pole elliptic-function filter; enclosures; resonant frequencies; resonant modes; rigorous mode-matching method; small aperture coupling theory; spurious-free stopbands; stopband characteristics; unloaded Q; Apertures; Conductors; Dielectrics; Low pass filters; Mode matching methods; Resonance; Resonant frequency; Resonator filters; Solids; Testing;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.643849

Filename

643849