An inductor-loaded microstrip directional coupler for directivity enhancement

Seungku Lee, Yongshik Lee

Research output: Contribution to journalArticle

26 Citations (Scopus)


A directivity-enhancement technique is demonstrated for a microstrip directional coupler. By loading the coupler with shunt inductors, the phase velocities of the even and odd modes are altered in such a way that an isolation null is achieved. Compared with other compensation techniques for directivity enhancements, the proposed method provides the advantages of being simple yet easily application to high frequencies. For a 10 dB directional coupler at 0.9 GHz, a maximum directivity improvement of nearly 38 dB is measured over the conventional counterpart.

Original languageEnglish
Article number4967855
Pages (from-to)362-364
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
Publication statusPublished - 2009 Jun 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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