Full wave modeling of conducting posts in rectangular waveguides and its applications to slot coupled combline filters

Author

Yao, Wui-Wen ; Zaki, Kawthar A. ; Atia, Ali E. ; Hershtig, Rafi

Author_Institution

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

Volume

43

Issue

12

fYear

1995

fDate

12/1/1995 12:00:00 AM

Firstpage

2824

Lastpage

2830

Abstract

A full wave model of conducting posts in rectangular waveguides yielding their generalized S-matrix is presented. By cascading the generalized scattering matrices of the posts and waveguide discontinuities, slot couplings between two combline resonators are obtained. The validation and accuracy of the method are confirmed by comparing the numerical results with measured data. It is shown that both electric and magnetic couplings can be obtained by changing the slot positions, and the electric coupling is more sensitive to the tuning screw than magnetic coupling. A 6-pole slot coupled combline filter with asymmetrical transmission zeros is designed and built. Excellent filter responses are obtained

Keywords

S-matrix theory; rectangular waveguides; resonator filters; slot line components; waveguide discontinuities; waveguide filters; waveguide theory; S-matrix; conducting posts; electric coupling; full wave model; magnetic coupling; rectangular waveguides; resonators; slot coupled combline filters; tuning screw; waveguide discontinuities; Convergence of numerical methods; Couplings; Rectangular waveguides; Resonant frequency; Resonator filters; Scattering; Tellurium; Termination of employment; Transmission line matrix methods; Waveguide discontinuities;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.475641

Filename

475641