Design of dual-band balun with tapped stubs

Hualiang Zhang, Yitian Peng, Hao Xin

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

3 Scopus citations


This paper presents a new type of stub tapped balun for dual-band applications. In the design, a tapped stub is used to realize 900 phase shift at two frequencies, resulting in a dual-band quarter-wavelength transmission line. The dual-band line, as an impedance transformer, is then implemented into a branch-line balun for dual-band operations. Explicit design equations for the new balun are derived using the ABCD-matrix and even-odd mode method. To verify the design concept, a microstrip balun operating at 2.45/5.25 GHz is fabricated on printed circuit board. Measurement results match well the theoretical predictions.

Original languageEnglish (US)
Title of host publication2008 IEEE Radio and Wireless Symposium, RWS
Number of pages4
StatePublished - 2008
Event2008 IEEE Radio and Wireless Symposium, RWS - Orlando, FL, United States
Duration: Jan 22 2008Jan 24 2008

Publication series

Name2008 IEEE Radio and Wireless Symposium, RWS


Other2008 IEEE Radio and Wireless Symposium, RWS
Country/TerritoryUnited States
CityOrlando, FL


  • Branch-line balun
  • Dual-band
  • Impedance transformer

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Communication


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