利用CST微波工作室软件对新一代Z箍缩驱动装置中变阻抗传输线部分进行了三维电磁场仿真，建立了同轴型指数线模型，在外导体内半径保持100 mm不变、输入端特性阻抗0.203 Ω、输出端特性阻抗2.16 Ω、输入角频率14×106 rad/s的半正弦脉冲TEM波的情况下，发现传输过程中会产生少量非TEM模，线的尺寸变化越剧烈,产生的非TEM模能量越多。在传输线足够长的情况下，电磁场仿真得到的电压传输效率与电路仿真结果相差不到1%，因此可以用电路仿真结果代替电磁场仿真。

The three-dimensional electromagnetic fields simulation of nonuniform transmission lines that were under consideration for the next generation of Z-pinch drivers was performed by a code called CST microwave studio. A coaxial exponential line model was established in which the inside radius of the outer conductor is 100 mm, the characteristic impedance is 0.203 Ω at the input port and 2.16 Ω at the output port and the input voltage is half-sine pulse wave as TEM mode with an angular frequency of 14×106 rad/s. A little energy of non-TEM mode is found during the transmission process. The more severely the radius of the line changes, the more energy of non-TEM mode is found. If the length of the transmission line is long enough, the difference of voltage transmission efficiency between electromagnetic fields and circuit simulation will be less than 1%. In this situation, results of electromagnetic fields simulation can be replaced by circuit situation.