摘要
针对复杂半空间格林函数难以计算的问题,提出一种改进的半空间时域有限差分(FDTD)方法,实现有耗半空间上方细缝金属腔的时域屏蔽效能的高效计算和分析。首先,采用广义传播矩阵法计算半空间复反射系数,再结合傅里叶变换得到半空间时域反射回波。其次,将直接入射波和半空间反射波共同引入到FDTD计算区域,半空间的影响通过反射波体现,从而回避计算形式复杂的半空间格林函数,实现金属腔内部观察点的耦合场及时域屏蔽效能的快速计算。与传统半空间FDTD方法相比,计算方法的误差在0.5%以内,而计算效率提升52%,证明了计算方法的正确性及有效性。结果表明,由于半空间的反射效应,细缝腔体内部观察点的场强增大,时域屏蔽效能显著下降。计算方法可用于半空间背景下腔体时域屏蔽效能的快速分析,从而为电子系统电磁耦合效应的评估提供参考。
In order to solve the problem that the half-space Green function of complex media is difficult to calculate,an improved half-space FDTD algorithm that avoids the half-space Green function is proposed to achieve the efficient computation analysis of the time-domain shielding effectiveness(SE)of the metallic cavities above the lossy half-space.Firstly,the generalized transition matrix method and Fourier transform are used to calculate the reflected wave of half-space.Secondly,with the direct incident wave and the reflected wave introduced into the calculation region,the coupling field of the observation point inside the cavity under different incident conditions is calculated and analyzed.Compared with the traditional half-space FDTD method,the calculation error here is within 0.5%,and the calculation efficiency is increased by 52%,which proves the correctness and effectiveness of this method.The numerical results show that due to the reflection effect in the half space,the field strength increases,and the time-domain shielding effectiveness decreases significantly.The method in this paper can be used to quickly analyze the shielding effectiveness of the cavity in the time domain in the half-space background,thus providing a reference for the evaluation of the electromagnetic coupling effects of electronic systems.
作者
曹乐
周远国
付周兴
CAO Le;ZHOU Yuan-guo;FU Zhou-xing(College of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;College of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2020年第6期1096-1101,共6页
Journal of Xi’an University of Science and Technology
基金
中国博士后基金项目(2019M653634)
陕西省自然科学基础研究计划项目(2019JQ-797)。
关键词
时域屏蔽效能
有耗半空间
半空间FDTD
屏蔽腔
电磁脉冲
time-domain shielding effectiveness
lossy half-space
FDTD method
shielding enclosure
electromagnetic pulse