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通过模拟计算,分析了翼片加载深度和角度对色散特性和耦合阻抗的影响;优化高频电路,初步设计了满足Ka/Q双频段螺旋线行波管的慢波结构。为了提高注波互作用电子效率,采用螺距渐变/跳变分布结构,并在输出段的相速增加段增加了一段凹槽。运用三维电磁场软件MTSS仿真行波管注波互作用,经过优化,得到了在Ka(33~36 GHz)频段范围内输出功率大于407 W,电子效率大于22.36%,增益大于48.32 d B,在Q(43.5~46.5 GHz)频段范围内输出功率大于266 W,电子效率大于15.86%,增益大于44.06 d B。
Through the simulation calculation, the influence of the loading depth and angle of the fin on the dispersion characteristics and the coupling impedance is analyzed. The high frequency circuit is optimized and the slow wave structure that satisfies the Ka / Q dual band helical traveling wave tube is preliminarily designed. In order to improve the electron efficiency of the wave-injection interaction, the pitch gradient / transition distribution structure is adopted, and a groove is added in the phase-velocity increasing section of the output section. The simulation results show that the output power is more than 407 W, the electronic efficiency is more than 22.36% and the gain is more than 48.32 d B in Ka (33 ~ 36 GHz) (43.5 ~ 46.5 GHz) frequency band output power greater than 266 W, the electronic efficiency is greater than 15.86%, gain greater than 44.06 d B.