Analysis of dielectric loaded cubical cavity for triple-mode filter design

Author

Chua, L.H. ; Mirshekar-Syahkal, D.

Author_Institution

Dept. of Electron. Syst. Eng., Univ. of Essex, Colchester, UK

Volume

151

Issue

1

fYear

2004

fDate

2/1/2004 12:00:00 AM

Firstpage

61

Lastpage

66

Abstract

Commercially available 3-D transmission-line matrix method (TLM) software is employed to analyse a cubical cavity resonator loaded concentrically with a cubical dielectric of dielectric constant 37. For the first time, a useful mode chart for seven degenerate modes of the resonator is generated from the computed results of the resonant frequencies. As an application of the mode chart, a triple-mode bandpass Cheb~yshev filter is designed and fabricated using the resonator operating in TM₁₁₁ mode. The unexpected asymmetry and the transmission zero in the response of the filter are attributed to the coupling between the input and output. When the coupling is characterised, close agreement between the simulated and measured performance of the filter is obtained.

Keywords

Chebyshev filters; band-pass filters; cavity resonator filters; coupled circuits; dielectric resonator filters; permittivity; transmission line matrix methods; 3-D transmission-line matrix method; TLM software; TM₁₁₁mode; bandpass Chebyshev filter fabrication; cubical dielectric loaded resonator; dielectric constant; dielectric loaded cubical cavity analysis; filter response; input-output coupling; mode chart application; resonant frequency; seven degenerate resonator mode; triple-mode filter design;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20040125

Filename

1267585