Transmission-line filters with capacitively loaded coupled lines

Chih Ming Tsai, Sheng Yuan Lee, Hong Ming Lee

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


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°) feed structure in these filters is also discussed and an example is given.

Original languageEnglish
Pages (from-to)1517-1524
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
Publication statusPublished - 2003 May

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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