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Chin. Phys. B, 2010, Vol. 19(4): 048703    DOI: 10.1088/1674-1056/19/4/048703
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Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide

Du Chao-Hai(杜朝海)a)b), Liu Pu-Kun(刘濮鲲)b), and Xue Qian-Zhong(薛谦忠)b)
a Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; b Graduate University of the Chinese Academy of Sciences, Beijing 100190, China
Abstract  Periodic dielectric-loaded waveguide is one of the diaphragmatic waveguides. For the excellent mode-selective propagation ability, it is of value for applications in gyrotron-traveling-wave amplifiers (gyro-TWT), accelerators, and other microwave propagation systems. This paper focuses on studying the application of the strong lossy-dielectric-loaded periodic waveguide in millimeter-wave gyro-TWT. It is revealed that due to the lossy property of the dielectric, the energy in the dielectric slots is absorbed effectively and the high order Bloch harmonics induced by the periodicity of the structure are suppressed, which changes the discrete spectrum under lossless condition into a continuous one. As a result, the periodicity of the system is severely suppressed and a mode in the hollow region could be approximated by a fast wave mode in an empty waveguide. These results bring specific guidance for the applications of the lossy dielectric-loaded waveguide in gyro-TWTs and other devices.
Keywords:  millimeter wave      lossy dielectric      Bloch harmonic      gyrotron-traveling-wave amplifier  
Received:  19 August 2009      Revised:  22 September 2009      Accepted manuscript online: 
PACS:  84.40.Az (Waveguides, transmission lines, striplines)  
  84.40.Ik (Masers; gyrotrons (cyclotron-resonance masers))  
  77.22.Gm (Dielectric loss and relaxation)  
  84.40.Fe (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.~60871051, 60871047 and 60971072).

Cite this article: 

Du Chao-Hai(杜朝海), Liu Pu-Kun(刘濮鲲), and Xue Qian-Zhong(薛谦忠) Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide 2010 Chin. Phys. B 19 048703

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