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

Author

Listed:
  • Zewei Wu
  • Hao Li
  • Biao Hu
  • Jianhua Xu
  • Tianming Li

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.

Suggested Citation

  • Zewei Wu & Hao Li & Biao Hu & Jianhua Xu & Tianming Li, 2013. "Design of a circular TE5,1 mode generator for gyrotrons low-power measurement," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 27(13), pages 1660-1671, September.
    • Handle: RePEc:taf:tewaxx:v:27:y:2013:i:13:p:1660-1671
    DOI: 10.1080/09205071.2013.822338
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