W波段单圆形电子注阶梯槽交错双栅行波放大器的模拟研究

Simulation Study on a W-Band Simple Circular Beam Traveling Wave Tube Using Staggered Double-Grating with Step-Shaped Grooves

基于一种用阶梯槽加载的双排交错双栅慢波结构,并在其中间开一个圆形电子注作为W波段宽频带行波管的注波互作用电路。使用三维全电磁仿真软件CST对该慢波结构的色散特性、耦合阻抗等"冷"态特性进行了模拟、仿真和分析。研究发现,该慢波结构色散特性很好,带宽较宽;耦合阻抗在取得合适参数情况下较大。最后利用CST中的PIC粒子模拟实验室对其进行了注波互作用研究,在45 mW的功率驱动下,饱和输出功率达到268.96 W,增益37.76dB,3dB带宽达到19GHz。

Simulation study on a wide bandwidth,high gain W-band simple circular beam travelling wave tube using a staggered double-grating with step-shaped grooves slow-wave structure is described in this paper.CST-MWS software is used to simulate and analyze dispersion characteristics and coupling impedance.The electromagnetic characteristic simulation shows that it has wide bandwidth and high coupling impedance.3-D particle-in-cell simulation predicts that with a 45 mW input power,the TWT produces an output power of 268.96 Wand a gain of 37.76 dB.The 3dB bandwidth is achieved at about 19 GHz.