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文章用微波网络分析法从理论上分析了爆磁压缩发生器（ＦＣＧ）输出的电磁波应当或怎样传输到虚阴极振荡器（Ｖｉｒｃａｔｏｒ），即所谓纵向传输问题。而后从麦氏方程组出发，导出了一维亥姆霍兹方程，它的解代表了电磁波沿纵向的传输特性。以金属矩形波导为例，说明了ＦＣＧ向Ｖｉｒｃａｔｏｒ的传输为单模传输，最低次模是ＴＥ１０模。最后，将波导定向耦合器作为ＦＣＧ向Ｖｉｒｃａｔｏｒ传输电磁波的传输线，从理论上证明是可行的。
In this paper, the microwave network analysis method is used to theoretically analyze whether the electromagnetic wave output by the explosion magnetic compression generator (FCG) should be transmitted to the virtual cathode oscillator (Vircator) or the so-called longitudinal transmission problem. Then from the Maxwell’s equations, one-dimensional Helmholtz equation is derived, and its solution represents the transmission characteristics of the electromagnetic wave along the longitudinal direction. Taking metal rectangular waveguide as an example, it shows that the transmission of FCG to Vircator is single mode transmission, and the lowest mode is TE10 mode. Finally, it is theoretically proved feasible to use waveguide directional coupler as the transmission line of FCG to Vircator.