Microwave filters with improved spurious performance based on sandwiched conductor dielectric resonators

Author

Weily, Andrew R. ; Mohan, Ananda S.

Author_Institution

Fac. of Eng., Univ. of Technol., Sydney, NSW, Australia

Volume

49

Issue

8

fYear

2001

fDate

8/1/2001 12:00:00 AM

Firstpage

1501

Lastpage

1507

Abstract

Microwave filters based on a novel resonator comprised of a sandwiched conductor dielectric resonator (SCDR) loaded in a cylindrical cavity are analyzed in this paper. The SCDR is a compact resonator that exhibits good spurious performance. Resonant frequencies of the lower order modes are analyzed, and mode charts, unloaded Q, slot coupling, and screw coupling graphs are presented. S-parameters are computed using the finite-difference time-domain (FDTD) method for one- and four-pole SCDR filters and compared with measured results. The measured spurious performance for the four-pole elliptic function filter shows a large improvement over conventional dielectric-resonator filters. The measured results agree closely with predicted values obtained using the FDTD method

Keywords

Q-factor; S-parameters; dielectric resonator filters; elliptic filters; finite difference time-domain analysis; microwave filters; S-parameters; cylindrical cavity; finite difference time domain method; four-pole elliptic filter; microwave filter; mode chart; one-pole filter; resonant frequency; sandwiched conductor dielectric resonator; screw coupling; slot coupling; spurious characteristics; unloaded Q-factor; Band pass filters; Conducting materials; Conductors; Dielectric measurements; Finite difference methods; Insertion loss; Microwave filters; Performance loss; Resonator filters; Time domain analysis;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.939933

Filename

939933