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2016-11-06

Diagnosis of Coupled Resonator Bandpass Filters Using VF and Optimization Method

By Rui Wang, Le-Zhong Li, Long Peng, Xiao-Qiang Tu, and Xiao-Xi Zhong
Progress In Electromagnetics Research M, Vol. 51, 195-203, 2016
doi:10.2528/PIERM16083001

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


Rui Wang, Le-Zhong Li, Long Peng, Xiao-Qiang Tu, and Xiao-Xi 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
http://www.jpier.org/PIERM/pier.php?paper=16083001

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