Exact synthesis of broadband three-line baluns

Hong Ming Lee, Chih Ming Tsai

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Three types of three-line baluns are studied in this paper. The equivalent circuits of these baluns are derived using the model of coupled transmission lines. The balun designs with Chebyshev response can then be exactly synthesized. A complete design procedure of the baluns with second-, third-, and fourth-order insertion loss functions is presented. Balun designs with wide bandwidths of more than 2 to 1 are achievable by this method. Some guidelines for practical realization are also suggested. A third-order balun design with a fractional bandwidth of 80% is given to demonstrate the proposed procedure.

Original languageEnglish
Article number4711084
Pages (from-to)140-148
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number1
Publication statusPublished - 2009 Jan

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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