An Inductive-Loading Method for Directivity Enhancement of Microstrip Coupled-Line Couplers

Jungje Ha, Woongjae Shin, Yongshik Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


This letter demonstrates a series-inductive loading method for the directivity enhancement of microstrip coupled-line couplers. The method has an extreme structural simplicity that is based on two pairs of mutually coupled inductors. Furthermore, it shows little, if any, compromise in the performance, as verified with a 20-dB coupler at 2 GHz. Experimental results show a ±0.5-dB bandwidth of 42%, which is the widest reported for reactively loaded coupler. The demonstrated 20-dB directivity bandwidth of 147% is the highest reported for a 20-dB coupler. Most importantly, the peak directivity of 59.9 dB is the highest reported thus far, which is a clear indication of the effectiveness of the proposed method.

Original languageEnglish
Article number7885086
Pages (from-to)356-358
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
Publication statusPublished - 2017 Apr

Bibliographical note

Funding Information:
National Research Foundation of Korea grant funded by the Korean Government (MEST) under Grant 2011-0016802.

Publisher Copyright:
© 2001-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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