Branch-line couplers using defected ground structure

Y. J. Sung, C. S. Ahn, Y. S. Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this letter, a novel design of a branch-line coupler with considerable reduction in its size and suppressed harmonic passband is proposed. By embedding a defected ground structure (DGS) unit cell under a microstrip line, compact branch-line couplers are easily achieved. The electrical length is scaled appropriately according to the slow-wave effect. In this case, the experimental coupling (S21 or S31) is comparable to that of conventional branch-line couplers. Also, experimental results indicate that DGS section is quite effective for the suppression of higher order harmonics.

Original languageEnglish
Pages (from-to)1665-1667
Number of pages3
JournalIEICE Transactions on Communications
Issue number4
Publication statusPublished - 2005


  • DGS
  • Harmonic suppression
  • Hybrid coupler
  • Size reduction

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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