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DIAGNOSIS OF COUPLED RESONATOR BANDPASS FILTERS USING VF AND OPTIMIZATION METHOD

By R. Wang, L.-Z. Li, L. Peng, X.-Q. Tu, and X.-X. Zhong

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Abstract:
This paper presents a hybrid method combining a vector fitting (VF) and a global optimization for diagnosing coupled resonator bandpass filters. The method can extract coupling matrix from the measured or the electromagnetically simulated admittance parameters (Y-parameters) of a narrow band coupled resonator bandpass filter with losses. The optimization method is used to remove the phase shift effects of the measured or the EM simulated Y-parameters caused by the loaded transmission lines at the input/output ports of a filter. VF is applied to determine the complex poles and residues of the Y-parameters without phase shift. The coupling matrix can be extracted (also called the filter diagnosis) by these complex poles and residues. The method can be used to computer-aided tuning (CAT) of a filter in the stage of this filter design and/or product process to accelerate its physical design. Three application examples illustrate the validity of the proposed method.

Citation:
R. Wang, L.-Z. Li, L. Peng, X.-Q. Tu, and X.-X. Zhong, "Diagnosis of Coupled Resonator Bandpass Filters Using VF and Optimization Method," Progress In Electromagnetics Research M, Vol. 51, 195-203, 2016.
doi:10.2528/PIERM16083001

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