Compact wide-band branch-line hybrids

Young Hoon Chun, Jia Sheng Hong

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)


Wide-band branch-line couplers are designed and tested. The proposed couplers feature compact size on a single circuit layer structure without via-holes. For the broad-band property and cost effectiveness, we have designed a four-branch hybrid with mixed distributed and lumped distributed elements. Analysis on the equivalent circuits was performed carefully in order to obtain a sufficient bandwidth with reduced design area. The fabricated hybrids have the fractional bandwidth larger than 56% at the center frequency of 2 GHz. They also show size reduction up to 55.2% compared with the conventional design method. © 2006 IEEE.

Original languageEnglish
Pages (from-to)704-709
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
Publication statusPublished - Feb 2006


  • Branch-line
  • Broad-band
  • Couplers
  • Hybrids
  • Lumped distributed elements
  • Microstrip line
  • Planar circuits


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