S波段大功率螺旋线脉冲行波管慢波结构研究

Investigation on a Slow-Wave Structure of S-Band High-Power Pulsed Helix TWTs

S波段大功率脉冲行波管是雷达系统的核心器件,起到微波放大的作用。本文设计了一种螺旋线慢波结构,可以将频带拓展到700 MHz,通过采用螺旋线螺距和内径双渐变技术,不仅提高了电子互作用效率,而且抑制了返波振荡。利用MTSS软件优化仿真计算,电子互作用效率达到了32%以上,输出功率达17 kW,增益在33.5 dB以上。最终测试样管在10%工作比的情况下,脉冲输出功率达到15 kW以上,电子效率达到30%以上,实现1.5 kW平均输出功率,提高了现有S波段脉冲行波管的功率量级。

S-band high-power pulsed traveling wave tubes(TWTs)are the core devices of radar systems,which play the roles of microwave amplification.A helix slow-wave structure is designed,which can extend the TWT bandwidth to 700 MHz.By adopting gradual change technology on the pitch and inner diameter of the helix,the electron interaction efficiency is improved and the backward-wave oscillations are suppressed.The MTSS software optimal simulation shows that the electron interaction efficiency is more than 32%,the output power is 17 kW and the gain is more than 33.5 dB.Under the duty cycle of 10%,the final test of the sample tube shows that the pulsed output power is more than 15 kW,the electron interaction efficiency is more than 30%and the average output power reaches 1.5 kW.The research improves the power level of current S-band pulsed TWTs.