Dual-band branch-line balun for millimeter-wave applications

Hualiang Zhang, Hao Xin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


This paper presents designs of branch-line type dual-band balun for millimeter-wave applications. The proposed balun is based on different types of dual-band impedance transformers. To understand the working principle of the baluns, closed-form equations are derived, where ABCD-matrix method is applied. It is found that the proposed baluns feature flexible realizable frequency ratio, making it suitable for millimeter-wave systems. To verify the design concept, an experimental prototype working at 20 / 44 GHz is designed, fabricated and characterized. The measurement results match well with the simulation results.

Original languageEnglish (US)
Title of host publicationIMS 2009 - 2009 IEEE MTT-S International Microwave Symposium Digest
Number of pages4
StatePublished - 2009
Event2009 IEEE MTT-S International Microwave Symposium, IMS 2009 - Boston, MA, United States
Duration: Jun 7 2009Jun 12 2009

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Other2009 IEEE MTT-S International Microwave Symposium, IMS 2009
Country/TerritoryUnited States
CityBoston, MA


  • ABCD-matrix
  • Balun
  • Branch-line
  • Dual-band
  • Millimeter Wave (mmW)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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