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Suppression of Backward-Wave Oscillation in High-Power Dual-Band Millimeter Wave Helix-Traveling Wave Tube
Pages: 1241-1246
Year: Issue:  11
Journal: Vacuum Science and Technology

Keyword:  Dual-bandBWOOscillation start-up lengthPitch distribution;
Abstract: Here,we addressed the suppression of backward-wave oscillation( BWO) in the high-power dual-band millimeter wave helix-traveling wave tube( TWT),based on the design of high-efficiency dual-band millimeter wave helix slow wave structure( SWS). The backward wave gain and normalized oscillation start-up length at the input of conventional negative-positive phase velocity tapering SWS were simulated with software MTSS. The impact of the 1st attenuator length,e-beam current and filling factor,on the normalized oscillation start-up length was investigated. The simulated results show that the normalized oscillation start-up length decreased with the increases of e-beam current and filling factor,but increased with an increase of the 1stattenuator length. A novel pitch taper,designed with the optimized pitch-distribution and inserted at the input,significantly suppressed the backward-wave oscillation,because the backward wave gains in Ka( 33 ~ 36 GHz) and Q( 43. 5 ~ 46. 5 GHz) bands were less than 15 d B.
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