Transmission-line filters with capacitively loaded coupled lines

descriptionPublicationkeyboard_double_arrow_right Article 01 May 2003 English Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Microwave Theory and Techniques, volume 51, pages 1,517-1,524 (issn: 0018-9480,

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Authors: null Chih-Ming Tsai; null Sheng-Yuan Lee; null Hong-Ming Lee;

doi: 10.1109/tmtt.2003.810133

Transmission-line filters with capacitively loaded coupled lines

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Abstract

Coupled lines with loads at one end, which can create tunable transmission zeros, are studied in this paper. The equation for the transmission zeros is derived from the analysis of even- and odd-mode excitations. Based on this equation, coupled lines with different loads are analyzed and the rules for controlling the transmission-zero frequency are given. The structures are used in the designs of several second-order filters and they are experimentally verified. The use of a skew-symmetric (0/spl deg/) feed structure in these filters is also discussed and an example is given.

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National Cheng Kung University
Taiwan

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