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Medientyp: E-Artikel Titel: On the design of a coupled line filter with a slightly mismatched load and its analysis by the Eigen Mode Expansion method Beteiligte: Takeda, Shigeki Erschienen: Wiley, 2004 Erschienen in: Electronics and Communications in Japan (Part II: Electronics) Sprache: Englisch DOI: 10.1002/ecjb.20080 ISSN: 8756-663X; 1520-6432 Schlagwörter: Electrical and Electronic Engineering ; Computer Networks and Communications ; General Physics and Astronomy Entstehung: Anmerkungen: Beschreibung: <jats:title>Abstract</jats:title><jats:p>Usually, filter design is carried out by first setting network functions for a matched condition between the signal source and the load. Next, a filter circuit is synthesized. In this process, errors entering the parameters in the process of deriving the network functions cause the characteristics to deviate, and often destroy the unitary condition so that synthesis of the circuit becomes impossible. This problem can be avoided by intentionally allowing mismatch between the signal source and the load in the design of the network functions. Although such an effect is present, the design procedure becomes complex and hence such a technique is rarely studied. In the present research, this concept is applied in order to recover network functions with the unitary condition destroyed due to the errors, so that a prototype low‐pass filter can be synthesized. Next, in order to confirm the effectiveness of this procedure, a coupled line filter at microwave frequencies is designed by using such network functions. Further, a Foster‐type equivalent circuit is derived for the coupled line filter by the Eigen Mode Expansion method. Along with confirming the characteristics of the network functions, the correspondence and discrepancy between the network functions and the coupled line filter are quantified. Through this series of circuit design and analysis, the effect of this design procedure and the applications to actual filter design are validated. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 87(9): 1–11, 2004; Published online in Wiley InterScience (<jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.interscience.wiley.com">www.interscience.wiley.com</jats:ext-link>). DOI 10.1002/ecjb.20080</jats:p>