A design procedure for bandstop filters in waveguides supporting multiple propagating modes

Author

Vale, Christopher Alfred Wolfgang ; Meyer, Petrie ; Palmer, Keith Duncan

Author_Institution

Dept. of Electr. & Electron. Eng., Stellenbosch Univ., South Africa

Volume

48

Issue

12

fYear

2000

fDate

12/1/2000 12:00:00 AM

Firstpage

2496

Lastpage

2503

Abstract

The method utilizes a cascade arrangement of resonant “block structures” to stop propagation of a number of modes across a specific band. These filters find particular application in dielectric heating facilities. The design is a two-step process: first, all the necessary block structures are assembled, and then they are cascaded to realize an optimally small filter that fulfills specifications. Two examples of designed filters are discussed. Both achieve better than 40-dB attenuation over a 5% bandwidth in the presence of five propagating modes. The measured results of one filter, realized at 19.1 GHz in WR-90, are shown to agree well with the predicted performance from the mode-matching-based analysis technique

Keywords

band-stop filters; cascade networks; mode matching; waveguide filters; 19.1 GHz; WR-90; bandstop filters; cascade arrangement; dielectric heating facilities; mode-matching-based analysis technique; multiple propagating modes; optimally small filter; propagating modes; resonant block structures; waveguides; Assembly; Attenuation; Circuits; Dielectrics; Electromagnetic heating; Frequency; Microwave filters; Performance analysis; Resonance; Waveguide discontinuities;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.899004

Filename

899004