Three-line microstrip directional coupler with high directivity

Seong Jin Kim, Moon Que Lee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This article proposes a novel microstrip directional coupler with high directivity. The proposed coupler was configured using three coupled transmission lines and two reflectors to cancel the leakage components in the isolation ports. To demonstrate the validity of the proposed coupler, we designed and fabricated the microstrip directional coupler with 15 dB coupling at 5.8 GHz. The measurement showed the directivity of 50.0 dB at 5.83 GHz, which was improved by 35.9 dB compared with that of conventional one.

Original languageEnglish
Pages (from-to)213-217
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number2
StatePublished - Feb 2022


  • U-NII radio bands
  • directional coupler
  • isolation
  • microstrip line
  • reflection coefficient


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