等离子体隐身中天线参数的数值计算

Calculation of Antenna′s Parameter in Plasma Stealth Antenna

研究了电磁波沿被轴向对称柱形等离子体包围的天线传播特性。通过对传播波矢、辐射方向图等天线参数分析,表明等离子体层在实现隐身同时,天线波矢、辐射方向图等参数也随等离子体密度、厚度等参数变化,一方面等离子体对电磁波的吸收,波矢衰减系数有增大的趋势,另一方面等离子体密度大于一定密度时,会增加天线的有效半径,使衰减系数减少,这些结果对于设计等离子体隐身具有一定参考价值。

This paper investigated some important antenna parameters, such as the transmission characteristics of a microwave propagating along the cylindrical antenna surrounded by symmetric plasma. By analyzing wave vector, dispersion relations, radiation pattern, we showed that antenna＇s parameters are changed by plasma density, radius and so on. The attenuation of wave vector will be large due to absorption of electromagnetic fields in the plasma. On the other hand, the valid radio is bigger when the density of plasma is large, so these results are very useful for the design of plasma stealth antenna.