Abstract
As the key component of vacuum electron device( VED),slow wave structure is a kind of periodic structure,whose dispersion properties can be presented as the sum of an infinite number of space harmonic wave. Each space harmonic wave exits as a dispersion curve with its characteristic. We proposed the idea of the full use of dispersion properties of periodic structures for high frequency vacuum power devices,and carried out the research on folded waveguide( FWG) slow wave structure,which was comparable with MEMS technology. The dispersion curve was analyzed,and was used for different kind of traditional devices including travelling wave tubes( TWTs),backward wave oscillator( BWO) and band-edge oscillators( BO).In addition,over-mode TWTs and TWT harmonic amplifier in THz( THAT) were proposed as novel devices.All the experimental investigation was focused on W-band and frequencies above,and the key technologies and the specifications obtained from these devices were given.
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