Dual-Band Microstrip Balun With Flexible Frequency Ratio and High Selectivity

Feng Huang, Jianpeng Wang*, Lei Zhu, Quangang Chen, Wen Wu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)


A new planar microstrip balun with two operation bands is presented and investigated in this letter. Originated from the traditional Marchand balun, the proposed dual-band balun is designed on a symmetrical four-port network with one short-circuited port. Derived equations and design charts show that the frequency ratio (m = f2/f1) of these two bands could be flexibly controlled in a wide range of 2.0-4.6. Moreover, inherent transmission zeros nearby each band have been introduced into this dual-band balun, aiming to improve the frequency selectivity. For verification, a prototype dual-band balun operating at 2.4 and 5.2 GHz (m = 2.17) is implemented and measured. Both simulation and measured results are recorded with good agreement.

Original languageEnglish
Article number8051075
Pages (from-to)962-964
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number11
Publication statusPublished - 1 Nov 2017
MoE publication typeA1 Journal article-refereed


  • Dual-band response
  • flexible frequency ratio
  • high selectivity
  • Marchand balun


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