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Impedance transforming rat-race couplers with modified Lange section

Author

Listed:
  • Robert Smolarz
  • Krzysztof Wincza
  • Slawomir Gruszczynski

Abstract

The relation between load impedances and the characteristic impedance of the rat-race ring has been derived. To minimize the circuit size, the 270°-long section has been replaced by a shorted coupled-line section. Moreover, to achieve appropriate coupling coefficient in the required coupled-line section, a modified Lange structure consisting of five-coupled lines has been applied. Furthermore, the second structure has been proposed having improved operational bandwidth, in which coupled-line matching sections are added. The theoretical analysis has been verified by measurements of the fabricated rat-race couplers operating at the center frequency 1 GHz. The designed couplers transforms 50 Ω input impedance into 10 Ω, which proves their practical applications.

Suggested Citation

  • Robert Smolarz & Krzysztof Wincza & Slawomir Gruszczynski, 2018. "Impedance transforming rat-race couplers with modified Lange section," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 32(8), pages 972-983, May.
    • Handle: RePEc:taf:tewaxx:v:32:y:2018:i:8:p:972-983
    DOI: 10.1080/09205071.2017.1411836
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