Broad-band coaxial directional couplers for high-power applications

A new class of coaxial broad-band directional couplers for high-power RF testing is presented. These devices overcome the drawbacks of classical stripline and coaxial couplers, and allow simple low-cost mechanical construction. A design technique for the new longitudinally nonuniform transversally n...

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Bibliographic Details
Published inIEEE transactions on microwave theory and techniques Vol. 51; no. 3; pp. 994 - 997
Main Authors Teppati, V., Goano, M., Ferrero, A., Niculae, V., Olivieri, A., Ghione, G.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2003
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bandwidth
Coaxial cables
Coaxial components
Conductors
Conformal mapping
Couplers
Cutoff frequency
Directional couplers
Joining
Microstrip
Microwaves
Noise levels
Nonuniform
Radio frequency
Stripline
Striplines
Synthesis
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Summary:A new class of coaxial broad-band directional couplers for high-power RF testing is presented. These devices overcome the drawbacks of classical stripline and coaxial couplers, and allow simple low-cost mechanical construction. A design technique for the new longitudinally nonuniform transversally nonsymmetrical couplers is described, providing the synthesis of any coupling shape versus frequency. As a first demonstration of the proposed method, a set of broad-band (2-7.5 GHz) low-coupling (-30, -33, -35 dB) nonsymmetrical coaxial directional couplers in air has been designed, built, and characterized, showing very good agreement between predicted and obtained performances.
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ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2003.808733