电磁波在等离子体中的传播衰减

Propagation Attenuation of Electromagnetic Waves in Plasma

针对通信黑障的问题,文中从电磁波在等离子体中的传播特性出发,利用Matlab数值仿真,研究不同电磁波频段,不同等离子体参数,包括等离子频率、碰撞频率、等离子温度、压强等对电磁波传播衰减的影响,以及外加磁场作用下,不同极化的电磁波在等离子体层的传播衰减特性。研究结果表明:外加磁场可明显降低圆极化电磁波衰减,并且当外加磁场满足一定条件,大于最小磁场强度时,电磁波衰减小于10 dB;且同等条件下右旋极化比左旋极化电磁波的衰减更小,为了获得较小的电磁波衰减,右旋极化电磁波所需的磁场强度也小于左旋极化。

Aiming at the problem of communication blackout,in this paper,based on the characteristics of electromagnetic wave propagation in plasma, different electromagnetic wave frequency bands, different plasma parameters including plasma frequency, collision frequency, plasma temperature are studied by Matlab simulation. The influence of pressure on the propagation and attenuation of electromagnetic wave and the attenuation characteristics of electromagnetic wave with different polarization in plasma layer under the action of external magnetic field. The results show that the applied magnetic field can obviously reduce the attenuation of circularly polarized electromagnetic wave, and when the applied magnetic field satisfies certain conditions and is larger than the minimum magnetic field intensity, the attenuation of the wave is less than 10 dB. And under the same conditions, the attenuation of right-handed polarized wave is less than that of left-handed polarized wave.In order to obtain smaller wave attenuation, the magnetic field intensity required by the right-handed polarized wave is less than that of the left-handed polarized wave.