Ka波段电磁波在大气等离子体中的透射特性

Propagation analysis of Ka-band electromagnetic wave in atmospheric plasma

在大气环境模拟实验平台上,利用S波段高功率微波(HPM)击穿大气产生等离子体,开展Ka波段电磁波在等离子体中的传输特性实验研究,得到不同频率电磁波下等离子体传输衰减规律,并发现电磁波与大气等离子互作用呈现透射新颖现象:Ka频段透射增强或减弱呈振荡形式,透射增强最大增幅接近2倍,最大增强频点附近透射增强以周期性规律出现,间隔周期约为80 MHz。随着气压升高,透射增强现象仍然存在,但增强幅度随之减小。理论分析了可能引起透射增强的原因,该试验研究成果为HPM大气等离子体在隐身、黑障通信等方面的应用提供了可能。

S-band High Power Microwave(HPM)is employed to produce the plasma in the atmosphere environment simulation chamber.The experiment researches on Ka-band microwave propagating characteristics in atmospheric plasma are performed,and the Ka-band microwave attenuation characteristics of atmospheric plasma are obtained.Some novelty propagation characteristics in the interaction of electromagnetic wave and atmospheric plasma are found:the electromagnetic wave transmission signal enhancement effect appears oscillation on Ka-band;the maximum value of propagation enhancement is almost 2 times,and the period of oscillation is 80 MHz.The phenomenon of propagation enhancement also occurs with the enhancing of buffer gas pressure,but the amplitude decreases.The reasons of propagation enhancement are analyzed.The research results provide important technical support for the application of plasma in stealth and black barrier communications.