再求一篇IEEE文章：A powerful tool for the synthesis of prototype filters with ar: A powerful tool for the synthesis of prototype filters with arbitrary topology.pdf

Macchiarella, G.;   
Dipt. di Elettronica e informazione, Politecnico di Milano, Italy  
This paper appears in: Microwave Symposium Digest, 2003 IEEE MTT-S International
Issue Date: 8-13 June 2003

On page(s): 1467 - 1470 vol.3
ISSN: 0149-645X
Print ISBN: 0-7803-7695-1
Cited by: 2
INSPEC Accession Number: 7686220
Digital Object Identifier: 10.1109/MWSYM.2003.1210382
Date of Current Version: 15 七月 2003
AbstractThis paper describes a CAD tool for synthesizing prototype filters with arbitrary topology, with cross-couplings starting also from source and (or) from load; the generalized Chebycheff characteristic is assumed, with asymmetric transmission zeros, both pure imaginary or complex. The proposed method employs the coupling matrix of a generic prototype, obtained through well-established procedures; then the coupling matrix of the desired topology is determined with a procedure based on multiple matrix rotations (similarity transforms) and numerical optimization (the sequence and angles of the rotations are automatically evaluated in the procedure and their knowledge is not a priori required). The novel CAD tool has been tested with some coupling schemes recently proposed, which don't require diagonal couplings for realizing asymmetric transmission zeros.

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