Title :
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
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;
Conference_Titel :
Communications, Computers and Signal Processing (PacRim), 2011 IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
978-1-4577-0252-5
Electronic_ISBN :
1555-5798
DOI :
10.1109/PACRIM.2011.6032945
