An inductor-loaded microstrip directional coupler for directivity enhancement

Seungku Lee, Yongshik Lee

Research output: Contribution to journalArticlepeer-review

36 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

Bibliographical note

Funding Information:
Manuscript received January 06, 2009; revised March 04, 2009. First published May 26, 2009; current version published June 05, 2009. This work was supported by the Defense Acquisition Program Administration and by the Agency for Defense Development of Korea, under Contracts 5ND0600407, UD-070054–AD, and UD-080040–GD.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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