Wideband branch-line couplers with single-section quarter-wave transformers for arbitrary coupling levels

Seungku Lee, Yongshik Lee

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Wideband branch-line couplers with arbitrary coupling levels are demonstrated. By integrating single-section quarter-wave transformers at each port, wideband characteristic with excellent coupling flatness is achieved. Also, a method is demonstrated that introduces intentional mismatch for a further enhancement in bandwidth. Superior structural and design simplicity outperform previous wideband couplers. Branch-line couplers at 3 GHz are demonstrated experimentally that maintain the coupling level within 0.5 dB from the specified 10 dB in as much as a 50.9% bandwidth, with minimum return loss and isolation of 16.3 and 18.7 dB, respectively.

Original languageEnglish
Article number6107591
Pages (from-to)19-21
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume22
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

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transformers
couplers
broadband
Bandwidth
bandwidth
flatness
isolation
augmentation

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

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abstract = "Wideband branch-line couplers with arbitrary coupling levels are demonstrated. By integrating single-section quarter-wave transformers at each port, wideband characteristic with excellent coupling flatness is achieved. Also, a method is demonstrated that introduces intentional mismatch for a further enhancement in bandwidth. Superior structural and design simplicity outperform previous wideband couplers. Branch-line couplers at 3 GHz are demonstrated experimentally that maintain the coupling level within 0.5 dB from the specified 10 dB in as much as a 50.9{\%} bandwidth, with minimum return loss and isolation of 16.3 and 18.7 dB, respectively.",
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Wideband branch-line couplers with single-section quarter-wave transformers for arbitrary coupling levels. / Lee, Seungku; Lee, Yongshik.

In: IEEE Microwave and Wireless Components Letters, Vol. 22, No. 1, 6107591, 01.01.2012, p. 19-21.

Research output: Contribution to journalArticle

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