Periodicity-suppressing effect of periodic lossy-dielectric-loaded cylindrical waveguide |
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Authors: | Du Chao-Hai Liu Pu-Kun and Xue Qian-Zhong |
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Institution: | [1]Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics Chinese Academy of Sciences, Beijing 100190, China [2]Graduate University of the Chinese Academy of Sciences, Beijing 100190, China |
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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. |
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Keywords: | millimeter wave lossy dielectric Bloch harmonic gyrotron-traveling-wave
amplifier |
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