Improved coupled-microstrip filter design using effective even-mode and odd-mode characteristic impedances

Hong Ming Lee, Chih Ming Tsai

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The transmission zeros of two coupled-microstrip circuits are studied in this research. Estimates for the frequencies of transmission zeros are given. A new concept of effective even- and odd-mode characteristic impedances is introduced. Useful design equations are given for improving the passband responses that are inherently distorted by different mode velocities. Finally, two filters with different topologies are designed for their zeros to be at the frequencies of the spurious harmonics and, thus, yield wide out-of-band rejections.

Original languageEnglish
Pages (from-to)2812-2818
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number9
Publication statusPublished - 2005 Sep 1


All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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