Title :
Parameter extraction for symmetric coupled-resonator filters
Author :
Hsu, Heng-Tung ; Zhang, Zhenyu ; Zaki, Kawthar A. ; Ati, A.E.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
fDate :
12/1/2002 12:00:00 AM
Abstract :
A new parameter-extraction procedure for symmetric coupled-resonator filters is presented. Closed-form recursive formulas are derived for the synthesis of all the filter parameters (resonant frequencies of the individual resonators and couplings between resonators) from known measured or simulated zeros and poles of input impedance functions of the singly terminated even and odd-mode networks. Capable of accurately predicting the unavoidable spurious couplings between nearby resonators, this simple and straightforward procedure can eliminate complicated optimization routines and have extensive applications in design and tuning of filters.
Keywords :
equivalent circuits; linear network analysis; linear network synthesis; matrix algebra; passive filters; poles and zeros; resonator filters; closed-form recursive formulas; filter parameters; filter tuning; filters synthesis; input impedance functions; parameter-extraction procedure; resonant frequencies; singly terminated even-mode networks; singly terminated odd-mode networks; spurious couplings; symmetric coupled-resonator filters; zeros and poles; Band pass filters; Coupling circuits; Filtering theory; Frequency measurement; Microwave filters; Network synthesis; Parameter extraction; Poles and zeros; Resonant frequency; Resonator filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2002.805283
