Bridged-T Coil for Miniature Dual-Band Branch-Line Coupler and Power Divider Designs

Wei Ting Fang, En Wei Chang, Yo Shen Lin

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


In this paper, a new design method for bridged-T coil (BTC) is proposed such that it can be made equivalent to two different transmission line sections at two different frequencies. In this way, on-chip dual-band branch-line coupler and dual-band power divider designs with very compact circuit sizes can be made possible through the use of BTCs. Specifically, the proposed 2.45/5.8-GHz dual-band branch-line coupler realized using the integrated passive device (IPD) process features a compact circuit size of only 2.8mm×1.4mm while the proposed 2.4/5.5-GHz dual-band power divider in IPD exhibits a very small circuit size of only 1.8mm×1.7mm. To the best of our knowledge, the proposed dual-band branch-line coupler is the smallest one ever reported while the circuit size of the proposed dual-band power divider is comparable to the smallest in the literature.

Original languageEnglish
Article number8065076
Pages (from-to)889-901
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
StatePublished - Feb 2018


  • Branch-line coupler
  • bridged-T coil (BTC)
  • dual band
  • hybrid coupler
  • integrated passive device (IPD)
  • power divider


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