Two section wideband 90° hybrid coupler using parallel-coupled three-line

Hong Jib Yoon, Byung Wook Min

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Two section wideband hybrid coupler with short-circuited coupled lines in the middle branch is demonstrated. The coupled lines are designed with a parallel-coupled 3-line, which has tight coupling and symmetric transmission phase over the center frequency. Without defected ground planes and a multilayer process, the proposed two-section coupler has the widest fractional bandwidth (FBW) than other two or even three section hybrid couplers modified from branch-line couplers. The designed wideband coupler has 55% FBW at the center frequency of 1.9 GHz. The bandwidth is limited by 1-dB power imbalance and the worst return loss, isolation, and phase imbalance within the bandwidth are 20.1 dB, 20.8 dB, and 3.2°, respectively.

Original languageEnglish
Article number7934098
Pages (from-to)548-550
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
Publication statusPublished - 2017 Jun

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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