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本文提出和设计了一种X波段大直径同轴相对论返波管，用时域有限差分法数值计算了器件慢波结构中TW模式的色散关系，耦合阻抗．运用粒子模拟程序仿真了器件中注波互作用的非线性物理过程，预见出器件输出功率、效率、工作频率，并对器件功率与慢波结构尺寸，电子注束流参数，引导磁场强度之关系进行了优化分析
In this paper, an X-band large-diameter coaxial relativistic back-wave tube is proposed and designed. The dispersion relationship and the coupling impedance of the TW mode in the device’s slow-wave structure are numerically calculated by using the finite-difference time-domain method. Particle simulation program is used to simulate the nonlinear physical process of the wave injection interaction in the device, and the output power, efficiency and operating frequency of the device are predicted, and the relationship between the device power and the structure of the slow wave, the electron beam injection parameters, Optimized analysis