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分析了带状螺旋线行波管中电磁场分量在柱坐标系下的Floquet形式,证明适当的坐标变换是电磁场分量写成变量分离形式的充分条件.螺旋带平面展开后,应用坐标变换得到的电磁场分量变量分离形式是去除面电流分布假设的理论基础.计算并分析了一个典型结构的色散和耦合阻抗,计算结果与实验结果有很好的一致.
The Floquet form of the electromagnetic field component in the cylindrical helical traveling wave tube in the cylindrical coordinate system is analyzed, and the proper coordinate transformation is proved to be sufficient condition for the electromagnetic field component to be written into the form of variable separation. After the helical band plane is expanded, the electromagnetic field component obtained by coordinate transformation The form of variable separation is the theoretical basis for the assumption of distribution of surface currents, and the dispersion and coupling impedance of a typical structure are calculated and analyzed. The calculated results are in good agreement with the experimental results.