均匀非磁化等离子体对电磁波吸收特性的影响

Influence of Uniform Unmagnetized Plasma on Electromagnetic Wave Absorption Characteristics

基于“黑障”问题,建立了“自由空间-等离子体层-自由空间”三层结构的物理模型。在此模型的基础上利用解析方法进行仿真,研究在不同厚度等离子体层的前提下,等离子体吸收率与电磁波频率之间的关系。分别改变等离子体中电子密度、外加磁场强度以及电子碰撞频率,研究等离子体层对左旋及右旋圆极化波的吸收情况以及电磁波在等离子体中单程衰减。研究表明,改变等离子体层厚度、电子密度、外加磁场强度以及电子碰撞频率影响参数后,等离子体对电磁波的吸收特性及单程衰减也随之发生改变,仿真结果对降低等离子体层的吸收率和解决“黑障”问题起到一定的参考作用。

Based on the“blackout”,the physical model of“free space-plasma layer-free space”is established.On the basis of this model,the analytical method is used to simulate and study the relationship between plasma absorption rate and electromagnetic wave frequency under the premise of different thickness plasma layer.The absorption of left-handed and right-handed circularly polarized waves by plasma layer and the one-way attenuation of electromagnetic waves in plasma were studied by changing the electron density,external magnetic field intensity and electron collision frequency,respectively.The results show that the absorption characteristics and one-way attenuation of electromagnetic waves by plasma change with the change of plasma layer thickness,electron density,external magnetic field strength,and electron collision frequency.The simulation results can be used as a reference for reducing the absorption rate of plasma layer and alleviating the problem of the“blackout”.