Circuit Model Extraction of Parallel-Connected Dual-Passband Coupled-Resonator Filters
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AbstractIn this paper, an analytical coupling matrix extraction scheme is proposed for parallel-connected dual-passband coupled-resonator filters for the first time. Model-based vector fitting technique is adopted to fit the measured responses of the dual-passband filter (DPBF) with a set of rational functions, from which a transversal coupling matrix can be constructed. A novel coupling matrix transformation strategy is developed to transform the transversal coupling matrix to the one corresponding to the topology of a parallel-connected DPBF. A practical filter is used as a test example to demonstrate the extraction procedure. In diagnosing the coupling matrix of the test filter, two kinds of ambiguity problems are discussed in detail and are solved by a perturbation technique. This paper provides a general theoretic framework for computer-aided tuning of a parallel-connected dual-passband or multiple-passband filter.
Acceptance Date30/09/2017
All Author(s) ListPing Zhao, Ke-Li Wu
Journal nameIEEE Transactions on Microwave Theory and Techniques
Volume Number66
Issue Number2
Pages822 - 830
LanguagesEnglish-United States
KeywordsCouplings, Tuning, Resonators, Topology, Ports (Computers), Integrated circuit modeling, Transmission line measurements

Last updated on 2020-18-10 at 02:57