磁化等离子体通道天线中电磁波的色散特性(英文)

Wave Dispersion Property in Magnetized Plasma Channel Antenna

针对现有高功率微波武器辐射天线的不足,提出了将磁化等离子体通道用作电磁脉冲辐射天线的思想———磁化等离子体通道天线(MPCA),分析了MPCA周围为有耗气体媒质时MPCA所传播的一般模式.简单阐述了MPCA的具体实现方法,根据MPCA的工作原理,建立了MPCA的几何模型,利用边界条件导出了MPCA最严格的色散方程.重点讨论了传播常数随等离子体参数、周围介质参数和外加磁场的变化.结果表明,有限磁场中的MPCA与无穷大磁场时具有一些不同的传播特性,这些结果对于该天线的实现很有参考价值.

In order to solve the problems existing in the current antenna for high power microwave weapon, the idea of a magnetized plasma channel used as antenna for radiating electromagnetic pulse is presented. The normal modes of Magnetized Plasma Channel Antenna （MPCA） in lossy gas are analyzed. The concrete realization method of this antenna is simply described. The geometric-model of MPCA is created based on the operating principle of this antenna. The strictest dispersion equation of MPCA is deduced by applying the boundary conditions of electromagnetic fields. Discussion is stressed on the variations of propagation constants with plasma parameters, surrounding material and external magnetic field. The analysis shows that MPCA in a finite magnetic field possesses some different properties compared with a plasma channel antenna where infinite external magnetic field exists. These results are useful for practical application of the antenna.