Bandwidth-compensation method for miniaturized parallel coupled-line filters

Seong Sik Myoung, Yongshik Lee, Jong Gwan Yook

Research output: Contribution to journalArticle

26 Citations (Scopus)


This paper proposes a bandwidth-compensation method for miniaturized filters based on short-ended parallel coupled lines. Capacitive loading of such coupled lines is a relatively simple means of reducing the line lengths. In this study, a method is developed that predicts exactly the degree of reduction in the fractional bandwidth due to miniaturization. Using this method, the fractional bandwidth of the prototype coupled line filter can be adjusted, enabling miniaturized filters to maintain the targeted fractional bandwidth. The proposed bandwidth-compensation method applies for any type of filters with coupled lines realized with various transmission lines, with uniform or nonuniform line lengths. Experimental results are also presented that verify the validity of the method.

Original languageEnglish
Pages (from-to)1531-1537
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number7
Publication statusPublished - 2007 Jul

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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