求IEEE文章一篇，谢谢。: Broad-Band Coaxial Directional Couplers for high-power applications.pdf

如题。Broad-band coaxial directional couplers for high-power applications 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.
Published in:Microwave Theory and Techniques, IEEE Transactions on (Volume:51 ,  Issue: 3 ) Page(s): 994 - 997 ISSN : 0018-9480 INSPEC Accession Number: 7571435 DOI: 10.1109/TMTT.2003.808733 Date of Publication : Mar 2003 Date of Current Version : 02 四月 2003 Issue Date : Mar 2003 Sponsored by : IEEE Microwave Theory and Techniques Society Publisher: IEEE