A Systematic Design Method for a Dual-Band Balun with Impedance Transformation and High Isolation

Eric S. Li, Chin Tse Lin, Huayan Jin, Kuo Sheng Chin*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

7 Scopus citations

Abstract

In this paper, the systematic design for a dual-band balun featuring impedance transformation and high output isolation is presented. A dual-band balun capable of conducting transformation between an unbalanced 50-Ω line and a balanced one of 300-Ω is proposed for its operations at 2.4-5.2 GHz with high output isolation. The combination of a dual-band λ4 stepped-impedance-stub line and a dual-band 4 T-junction coupled line produces an output phase difference of 180° at the two operating frequencies for the balun. An important feature of the proposed design is the 1:6 impedance transformation from an unbalanced source to a balanced load. High isolation can also be achieved by introducing an isolation circuit between the output ports. The measured isolation is better than -26 dB. The phase imbalance is under 3°, and the magnitude imbalance is less than 0.9 dB within the bandwidths.

Original languageEnglish
Article number8854785
Pages (from-to)143805-143813
Number of pages9
JournalIEEE Access
Volume7
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2013 IEEE.

Keywords

  • Dual-band balun
  • high isolation
  • impedance transformation

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