Abstract
The design and analysis of a high power and high e-ciency helix traveling-wave tube operating in the Ka-band are presented. First, a double-slotted helix slow-wave structure is proposed and employed in the interaction circuit. Then, negative phase-velocity tapering technology is used to improve electronic e-ciency. From our calculations, when the design voltage and beam current are set to be 18.45kV and 0.2A, respectively, this tube can produce average output power over 800W ranging from 28GHz to 31GHz. The corresponding conversion e-ciency varies from 21.83% to 24.16%, and the maximum output power is 892W at 29GHz.
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