Directivity Enhancement of Tight Couplers

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4 Scopus citations

Abstract

An enhancement of 22 dB in directivity, and 15 dB in return loss was achieved in an improved wiggly-line coupler. The improvement was obtained by introducing two new degrees of freedom to the wiggly-line. Heat maps of coupling, directivity and return loss, as a function of the new degrees of freedom, show previously unavailable fine-tuning capabilities, from which optimal parameters were derived. The use of the improved wiggly-line allows a better even- and odd-mode phase velocity compensation, and an improvement of 42% of even- and odd-mode velocity difference is shown. The improved wiggly-line concept is used to design a tight, tandem, 1.6dB coupler as a center stage of 3-stage symmetrical wideband, 6-18 GHz, 90- degree hybrid coupler implemented in microstrip coupled line topology using bond wires for the tandem section. The loose stage is designed using periodic, quasi-lumped, capacitively-loaded coupled lines. A CST simulation of each design step is shown.

Original languageEnglish
Title of host publication2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538695494
DOIs
StatePublished - Nov 2019
Event2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2019 - Tel-Aviv, Israel
Duration: 4 Nov 20196 Nov 2019

Publication series

Name2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2019
Volume2019-January

Conference

Conference2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2019
Country/TerritoryIsrael
CityTel-Aviv
Period4/11/196/11/19

Keywords

  • broadband directional couplers
  • directivity enhancement
  • wiggly-line

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