DocumentCode :
1071629
Title :
Advanced coupling matrix synthesis techniques for microwave filters
Author :
Cameron, Richard J.
Author_Institution :
COM Dev Int. Ltd., Aylesbury, UK
Volume :
51
Issue :
1
fYear :
2003
fDate :
1/1/2003 12:00:00 AM
Firstpage :
1
Lastpage :
10
Abstract :
A general method is presented for the synthesis of the folded-configuration coupling matrix for Chebyshev or other filtering functions of the most general kind, including the fully canonical case, i.e., N prescribed finite-position transmission zeros in an Nth-degree network. The method is based on the "N+2" transversal network coupling matrix, which is able to accommodate multiple input/output couplings, as well as the direct source-load coupling needed for the fully canonical cases. Firstly, the direct method for building up the coupling matrix for the transversal network is described. A simple non-optimization process is then outlined for the conversion of the transversal matrix to the equivalent "N+2" folded-configuration coupling matrix. The folded matrix may be used directly to realize microwave bandpass filters in a variety of technologies, but some of these could require awkward-to-realize cross-couplings. This paper concludes with a description of two simple procedures for transforming the transversal and folded matrices into two novel network configurations, which enable the realization of advanced microwave bandpass filters without the need for complex inter-resonator coupling elements.
Keywords :
Chebyshev filters; matrix algebra; microwave filters; network synthesis; passive filters; poles and zeros; two-port networks; Chebyshev function; bandpass filters; direct source-load coupling; filtering functions; folded-configuration coupling matrix; fully canonical cases; general synthesis method; multiple input/output couplings; nonoptimization process; transversal network coupling matrix; Band pass filters; Circuit synthesis; Coupling circuits; Filtering; Microwave filters; Microwave theory and techniques; Network synthesis; Resonator filters; Symmetric matrices; Transversal filters;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2002.806937
Filename :
1159661
Link To Document :
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