对螺旋波纹波导回旋行波管的色散特性进行了研究，通过理论分析推导了螺旋波纹波导的色散方程。进一步对色散曲线进行了数值计算，并着重分析了几何结构参数变化对其色散特性的影响,由此得到了合理的结构参数。同时利用三维电磁仿真软件CST模拟计算了在该参数下螺旋波纹波导的本征模式并与理论结果作对比，误差小于3%。

This paper studied the dispersion of the gyro-TWT with a helical waveguide, and the dispersion equations were obtained by theoretic analysis. The dispersion curves were studied through numerical computation. The paper mainly analyzed how the change of the structure parameters would affect the dispersion characteristics. Reasonable structure parameters were given. By using the electromagnetic simulation software CST, the operating eigenwave of helical waveguide with given parameters was calculated and compared with theoretical data.