Model-Based Vector-Fitting Method for Circuit Model Extraction of Coupled-Resonator Diplexers
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AbstractIn this paper, a novel rational function approximation method, namely, model-based vector fitting (MVF), is proposed for accurate extraction of the characteristic functions of a coupled-resonator diplexer with a resonant type of junction from noise-contaminated measurement data. MVF inherits all the merits of the vector-fitting (VF) method and can also stipulate the order of the numerator of the model. Thus, MVF is suitable for the high-order diplexer system identification problem against measurement noise. With the extracted characteristic functions, a three-port transversal coupling matrix of a diplexer can be synthesized. A matrix orthogonal transformation strategy is also proposed to transform the obtained transversal matrix to a target coupling matrix configuration, whose entries have one-to-one relationship with the physical tuning elements. The whole model extraction procedure is analytical and robust, and can be used in a computer-aided tuning (CAT) program for coupled-resonator diplexers. A practical tuning example of a diplexer with a common resonator is given in detail to demonstrate the effectiveness and the practical value of the proposed method.
All Author(s) ListZhao P, Wu KL
Journal nameIEEE Transactions on Microwave Theory and Techniques
Volume Number64
Issue Number6
Pages1787 - 1797
LanguagesEnglish-United Kingdom
KeywordsComputer-aided tuning (CAT); coupling matrix; microwave diplexer; rational approximation; vector fitting (VF)
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic

Last updated on 2021-22-09 at 02:08