Small-signal analysis of a rectangular helix structure traveling-wave-tube |
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| Authors: | Fu Cheng-Fang Wei Yan-Yu Duan Zhao-Yun Wang Wen-Xiang and Gong Yu-Bin |
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| Affiliation: | National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China |
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| Abstract: | This paper investigates the properties of traveling wave-beam
interaction in a rectangular helix traveling-wave-tube (TWT) for a
solid sheet electron beam. The `hot' dispersion equation is obtained
by means of the self-consistent field theory. The small signal
analysis, which includes the effects of the beam parameters and
slow-wave structure (SWS) parameters, is carried out by
theoretical computation. The numerical results show that the
bandwidth and the small-signal gain of the rectangular helix TWT
increase as the beam current increases; and the beam voltage not obviously
influences the small signal gain. Among different
rectangular helix structures, the small-signal gain increases as the
width of the rectangular helix SWS increases, however, the bandwidth
decreases whether structure parameters $a$ and $L$ or $\psi$ and $L$
are fixed or not. In addition, a comparison of the small-signal gain
of this structure with a conventional round helix is made. The
presented analysis will be useful for the design of the TWT with a
rectangular helix circuit. |
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| Keywords: | rectangular helix small-signal
gain slow-wave structure compact TWT |
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