尖劈形吸波体和微波暗室中的数学模型

The Mathematical Model of Wedge-shaped Absorbers and Microwave Darkroom

首先讨论电磁波在尖劈形吸波体形成的空缺中的反射问题.通过建立二维空间内两次相邻反射的数学模型,得到尖劈的几何参数和电磁波出射角、更射次数和辐射强度的关系.然后通过仿真计算出数值结果,并且将其推广到三维情况,得到了"在一定条件下,减小尖劈形吸波体顶角的大小,有利于增加反射次数,增强吸波效果"的结论.针对导弹导引试验中的仿真要求,从电磁波辐射角系数的概念出发,提出了一种计算微波暗室中静区的接收到墙面更射的功率与天线辐射的功率的比值的算法.这种算法物理意义清晰,计算过程简单,可较好的应用在导弹的导引仿真试验的分析中.

This paper firstly discusses the reflection phenomenon of electromagnetic wave among wedge-shaped absorbers. By establishing the model of two adjacent reflections in two-dimensional space, we obtain the reflection angle, number of reflections and radiant intensity in connection with geometric parameters of wedges. Then we calculate the numerical result by means of simulation, generalize it to three-dimensional space, and draw the conclusion that to a certain extent, decreasing the vertex angle of wedge-shaped absorbers will contribute to increasing the number of reflections and strengthen the effect of absorbing. In terms of the requirement to missile guidance stimulation tests, according to the conception of radiation angle coefficient of electromagnetic wave, we put forward an algorithm that calculate the ratio between power that quiet zone of the microwave darkroom receives from wall surface radiation and power of the antenna radiation. This algorithm has a clear physical meaning and an easy calculation step, so it can be easily,applied to the analysis of missile guidance stimulation tests.