Evanescent-mode filters with arbitrarily positioned ridges in circular waveguide

Author

Yu, Seng Yong ; Bornemann, Jens

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Victoria, Victoria, BC, Canada

fYear

2011

fDate

23-26 Aug. 2011

Firstpage

504

Lastpage

508

Abstract

The design of new circular waveguide evanescent-mode filters is facilitated by an eigenvalue approach which allows an arbitrary number of ridges to be placed at arbitrary locations within a circular waveguide cross sections. Several four-pole filter examples with passbands in the 7 GHz to 10 GHz range include double ridges, T-septa and key-shaped inserts. Although higher-order-mode excitation is observed in the larger input and output guides, their levels are low enough to refrain from influencing the operation of the filters. The performance is validated by comparison with measurements and the commercial full-wave field solver CST Microwave Studio.

Keywords

band-pass filters; circular waveguides; eigenvalues and eigenfunctions; microwave filters; waveguide filters; T-septa; arbitrarily positioned ridge; circular waveguide; double ridges; eigenvalue approach; evanescent-mode filter; four-pole filter; frequency 7 GHz to 10 GHz; higher-order-mode excitation; key-shaped inserts; passband; Band pass filters; Eigenvalues and eigenfunctions; Filtering theory; Microwave filters; Rectangular waveguides; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Computers and Signal Processing (PacRim), 2011 IEEE Pacific Rim Conference on

Conference_Location

Victoria, BC

ISSN

1555-5798

Print_ISBN

978-1-4577-0252-5

Electronic_ISBN

1555-5798

Type

conf

DOI

10.1109/PACRIM.2011.6032945

Filename

6032945