110GHz高功率微波在大气击穿等离子体中的传输、反射和吸收  

Transmission,reflection and absorption of 110 GHz high-power microwave in air breakdown plasma

作　　者：赵朋程[1] 郭立新[1] 李慧敏[1] 

机构地区：[1]西安电子科技大学物理与光电工程学院,西安710071

出　　处：《电波科学学报》2016年第3期512-515,共4页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.61501358);中央高校基本科研业务费

摘　　要：高功率微波极易引起大气击穿,而伴随产生的等离子体将对微波传播特性产生很大的影响.基于电子流体模型,研究了一个大气压下110GHz高功率微波在大气击穿等离子体中的传输、反射和吸收特性.模拟结果表明,大气击穿等离子体结构在空间呈丝状分布,其与实验现象符合得很好;由于大气击穿等离子体是时变的,其对微波的反射和吸收也是时变的;随着时间的推移,等离子体吸收功率逐渐增加直至达到饱和水平,且其远大于微波反射功率;当减小入射电场时,等离子体对微波的反射变得更低.将110GHz微波击穿阈值的模拟结果与实验数据进行对比,发现两者吻合得很好.A high-power microwave easily causes the air breakdown,and the produced plasma has an obvious influence on the microwave propagation.In this paper,the transmission,reflection and absorption of 110 GHz high-power microwave in air breakdown plasma at atmospheric pressure is studied using a electron fluid model.Simulations show that,the filamentary plasma structure in 110 GHz microwave air breakdown similar to the experimental phenomenon is reproduced;the reflection and absorption of the microwave by the breakdown plasma change with time because the plasma is a time-varying media;with time increasing,the plasma absorption increases,till it reaches the saturation level that is much higher than the reflection by the plasma.As the incident electric field decreases,the reflection by the breakdown plasma becomes lower.The breakdown threshold of 110 GHz high-power microwave obtained by simulations agrees well with the experimental data.

关 键 词：高功率微波 大气击穿 等离子体 传播 

分 类 号：O451[理学—无线电物理]