Design of a circular TE5,1 mode generator for gyrotrons low-power measurement

Zewei Wu, Hao Li, Biao Hu, Jianhua Xu and Tianming Li

Journal of Electromagnetic Waves and Applications, 2013, vol. 27, issue 13, 1660-1671

Abstract: To test quasi-optical mode converters for gyrotrons, an efficient low-power generator for rotating high-order modes with high purity is necessary. A W-band mode generator which converts a TE1,0 rectangular waveguide mode into either a linearly or a circularly polarized TE5,1 circular mode is designed, fabricated, and measured. The generator consists of a mode converter, a waveguide transition, and a polarization converter. The converting process in each section is displayed and the working principles are discussed. The back-to-back measured results show that the conversion efficiency exceeds 63% with −2 dB from 92 to 95 GHz is obtained. The angle-independent transmissions demonstrate high-mode purity and the field pattern is directly demonstrated on a temperature-sensitive liquid-crystal sheet. The proposed mode generator features high-mode purity, easy to construct, and polarization controllability.

Date: 2013
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DOI: 10.1080/09205071.2013.822338

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