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PIER PIER B PIER C PIER M PIER Letters
2011-08-30
Improved Extraction of Coupling Matrix and Unloaded q from S-Parameters of Lossy Resonator Filters
By
Rui Wang,

    Dr. Rui Wang

    University of Electronic Science and Technology of China

    China

    Homepage

Jun Xu,

    Dr. Jun Xu

    School of Physical Electronics

    University of Electronic Science and Technology of China

    China

    Homepage

Chao Lei Wei,

    Dr. Chao Lei Wei

    University of Electronic Science and Technology of China

    China

    Homepage

Mao-Yan Wang,

    Prof. Mao-Yan Wang

    University of Electronics Science and Technology

    China

    Homepage

Xiao-Chuan Zhang

    Mr. Xiao-Chuan Zhang

    Institute of Applied Physics

    University of Electronic Science and Technology of China

    China

    Homepage

Progress In Electromagnetics Research, Vol. 120, 67-81, 2011
doi:10.2528/PIER11072804
Abstract
This paper presents a two-stage optimization method for accurately extracting the coupling matrix (CM) and the unloaded quality factor (unloaded Q) of each resonator from the measured (or simulated) S-parameters of lossy cross-coupled resonator bandpass filters. The method can be used in computer-aided tuning (CAT) of microwave filters to accelerate filter design and physical realization. In our method, the Cauchy method is employed for determining characteristic polynomials of the S-parameters in the normalized low-pass frequency domain, and the CM and unloaded Q are extracted by two-stage optimization method using genetic algorithm. With respect to the previous methods available in the literatures, the proposed method allows the CM extraction of the filter with source-load coupling. Moreover, the accuracy and robustness of the method can be improved due to the usage of the second stage optimization. The proposed method is applied to the diagnosis of a general coupled resonator filter with/without source-load coupling.
Citation
Rui Wang, Jun Xu, Chao Lei Wei, Mao-Yan Wang, and Xiao-Chuan Zhang, "Improved Extraction of Coupling Matrix and Unloaded q from S-Parameters of Lossy Resonator Filters," Progress In Electromagnetics Research, Vol. 120, 67-81, 2011.
doi:10.2528/PIER11072804
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