Abstract
This article presents a generalized coupling matrix (CM) extraction technique directly from the measured or electromagnetic simulated admittance parameter (Y-parameters) of a narrow band cross-coupled resonator bandpass filter with losses. The characteristic polynomials corresponding to the Y-parameters rather than the S-parameters are derived and then determined by the Cauchy method. Once determining the characteristic polynomials, the complex poles and residues of Y-parameters are also determined. Using these complex poles and residues, the complex CM can be obtained by a sequence of similarity transformations, and then the desired extracted CM and unloaded Q for each resonator are obtained from this complex CM. To verify the effectiveness of the proposed method, three filter CM extraction examples are demonstrated. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:807–814, 2015.
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