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

Research output: Contribution to journalArticleScientificpeer-review


Research units

  • Nanjing University of Science and Technology
  • University of Macau


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

    Research areas

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

ID: 39570924