随机粗糙面上解决低频崩溃问题的电磁散射研究  

Study of Electromagnetic Scattering on the Problem of Low Frequency Crash on Random Rough Surfaces

作　　者：高正平[1] 郭靖锋 

机构地区：[1]电子科技大学微电子与固体电子学院,四川成都610054

出　　处：《信息记录材料》2018年第6期8-11,共4页Information Recording Materials

摘　　要：本文用线性滤波法模拟了二维随机粗糙表面,介绍了新型的积分方程增量型电场积分方程(AEFIE)。并用新型的积分方程来解决计算随机粗糙面的RCS面临的低频崩溃问题。采用商业FEKO软件中矩量法(MOM)对随机粗糙面双站散射系数σ进行计算时,由于低频下剖分尺寸远小于波长,产生低频崩溃问题,使得低频求解中得不到精确的解,导致计算时间过长以及计算的散射系数误差较大等情况的产生。本文又采用了自编程软件的AEFIE并用多层快速多极子法加速与商业FEKO软件中传统多层快速多极子算法(MLFMA)对随机粗糙面双站散射系数σ进行计算与对比,不仅表明了AEFIE方法计算随机粗糙面散射系数σ的准确性,也突出了AEFIE方法用多层快速多极子算法加速后占用内存更少以及更高效的特性。同时也验证了均方根高度和相关长度的变化对RCS的影响,最后得出结论。In this paper, a two-dimensional random rough surface is simulated by the linear filtering method, and a new augmented electric field integral equation （AEFIE） is introduced. A new type of integral equation is also used to solve the low-frequency collapse problem of RCS. When calculating the birefringence a of a random rough surface by using the method of moment analysis （MOM） in the commercial FEKO software, the problem of low-frequency collapse arises because the sub-wavelength size is much smaller than the wavelength in the low frequency, resulting in lack of memory in the computer, calculation time is too long and the calculated scattering coefficient error is larger and so on. In this paper, the self-programming software AEFIE method and the multi-layer fast multipole algorithm （MLFMA） in the commercial FEKO software are used to calculate and compare the two-station scattering coefficient o of the random rough surface. It not only shows that the AEFIE method can calculate the random rough surface scattering coefficient o Accuracy, but also highlights the AEFIE method occupies less memory and more efficient features. At the same time, we also verify the influence of the root mean square height and the correlation length on the RCS, and finally conclude.

关 键 词：随机粗糙面 增量型积分方程 低频崩溃 散射系数 

分 类 号：TB39[一般工业技术—材料科学与工程]