再求一文献：Fast synthesis of coupled-resonator filters: Fast synthesis of coupled resonator filters.pdf

Lamecki, A.;   Kozakowski, P.;   Mrozowski, M.;   
Dept. of Electron. Informatics & Telecommun., Tech. Univ. of Gdansk, Poland   This paper appears in: Microwave and Wireless Components Letters, IEEE
Issue Date: April 2004
Volume: 14 Issue:4
On page(s): 174 - 176
ISSN: 1531-1309
References Cited: 12
Cited by : 3
INSPEC Accession Number: 7967507
Digital Object Identifier: 10.1109/LMWC.2004.827111  
Date of Current Version: 04 五月 2004
Sponsored by: IEEE Microwave Theory and Techniques Society  

AbstractThis letter proposes a new quickly converging technique for the synthesis of coupling matrix of cross-coupled resonator filters. The method formulates the synthesis as a nonlinear least squares problem involving the zeroes and poles of short circuit input and output admittances, as well as eigenvalues of the coupling matrix and its principal sub-matrices. The solution is found via a damped Levenberg-Marquardt method with analytically computed gradients. Numerical tests show that coupling matrices for high order pseudo-elliptical filters can be found in surprisingly few optimization steps.

Fast synthesis of coupled-resonator filters  这篇文章不错，值得看~