The Small Signal Analysis of a Centered Dielectric-Rod Loaded, Arbitrarily-Shaped Helical Groove Traveling-Wave-Tube |
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| Authors: | Yanyu Wei Hongtao Liu Jun He Yubin Gong Lingna Yue Wenxiang Wang and Gun-Sik Park |
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| Institution: | (1) Vacuum Electronics National Laboratory, University of Electronic Science and Technology of China, Chengdu, 610054, China;(2) School of Physics, Seoul National University, 171-742 Seoul, South Korea |
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| Abstract: | Properties of traveling wave-beam interaction in a centered dielectric-rod loaded, arbitrarily-shaped helical groove slow-wave
structure (SWS) are investigated for a thin annular electron beam. The “hot” dispersion equation is obtained by means of the
self-consistent field theory, and the small signal analysis is carried out including the effects of the dielectric-rod parameters
and the groove shapes. The numerical results show that the bandwidth of the helical groove TWT is expanded by loading dielectric-rod,
however, the small-signal gain is reduced; and when the groove shape changes from the swallow-tail shape to the triangle shape,
the working frequency increases , while the peak gain decreases.
Project supported by the National Nature Science Foundation of China (Granted NO.60401005 and 60532010). |
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| Keywords: | Arbitrarily-shaped helical groove Small-signal gain Dielectric-rod Slow wave structure Millimeter wave TWT |
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