中文摘要：

指数型粗糙面由MonteCarlo方法来模拟，运用矩量法（MoM）研究了指数型粗糙面下方介质中的电磁波透射特征。其中，入射波为平面波加高斯窗函数后的Thorsos锥形波。通过计算得到了透射系数随透射波散射角变化的曲线，分析了透射系数与粗糙面高度起伏均方根、相关长度、介质介电常数、入射波频率之间的依赖关系。结果表明粗糙面高度起伏均方根、相关长度、介电常数的实部、入射波频率对透射系数的影响明显，而介电常数的虚部对透射系数的影响较小。

英文摘要：

An exponential rough surface is simulated using Monte Carlo method. The transmission characteristic of the electromagnetic wave in medium under the exponential rough surface is studied using the method of moment （MoM）, where the incident waver refers to the Thorsos tapered wave .formed of plane wave superimposed by the Gauss window function. The curves of the transmission coefficient with varying scattering angle of transmission wave are obtained by the numerical calculation,and the dependencies between the transmission coefficient and the root-mean-square height of the rough surface,the correlation length of rough surface, the permittivity of medium,the frequency of incident wave are analyzed. The results indicate that there is a considerable influence on the transmission coefficient for the root-mean- square height of the rough surface, the correlation length of rough surface, the real part of permittivity and the frequency of incident wave, whereas the influence of the imaginary part of permittivity can be negligible.