Abstract
The coaxial circular-arc-groove periodic slow-wave system for relativestic traveling wave tubes (RTWT) is presented in this paper. To analyze the field in the groove region, the continuous profile of the circular arc is approximately replaced by a series of rectangular steps and the field continuity at the neighboring steps is deduced. The dispersion equation of the coaxial circular-arc-groove slow-wave structure is derived by the matching conditions at the interface between the groove region and central region. The influence of various circuit parameters on the dispersion relation is investigated by the numerical calculation.
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