Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide

doi:10.1088/1674-1056/19/4/048703

中国物理B ›› 2010, Vol. 19 ›› Issue (4): 48703-048703.doi: 10.1088/1674-1056/19/4/048703

Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide

刘濮鲲¹, 薛谦忠¹, 杜朝海²

(1)Graduate University of the Chinese Academy of Sciences, Beijing 100190, China; (2)Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;Graduate University of the Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2009-08-19 修回日期:2009-09-22 出版日期:2010-04-15 发布日期:2010-04-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.~60871051, 60871047 and 60971072).

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

Received:2009-08-19 Revised:2009-09-22 Online:2010-04-15 Published:2010-04-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.~60871051, 60871047 and 60971072).

摘要/Abstract

摘要： 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.

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.

Key words: millimeter wave, lossy dielectric, Bloch harmonic, gyrotron-traveling-wave amplifier

中图分类号: (Waveguides, transmission lines, striplines)

84.40.Az

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.))

杜朝海, 刘濮鲲, 薛谦忠. Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide[J]. 中国物理B, 2010, 19(4): 48703-048703.

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[J]. Chin. Phys. B, 2010, 19(4): 48703-048703.

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Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide

Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide

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