开孔金属腔屏蔽效能快速算法适用性评估

摘要

The applicability of four different fast algorithms for shielding effectiveness (SE) prediction of rectangular metallic enclosures with apertures is evaluated, in order to choose appropriate algorithm for practical engineering problem.The SE values of 864 metallic enclosures with different shape, size and apertures are calculated using these four algorithms and compared to FDTD results.According to the variation of absolute error and curvilinear correlation coefficient in terms of dimension sizes of cavity and aperture, the applicable numbers of modes of these four different fast algorithms for shielding effectiveness (SE) prediction is determined eventually.The results show that Modal-MOM has the largest applicable number of modes, ILCM follows, and TLECM has the least applicable number of modes.These results provide a guidance for practical engineering applications.%对开孔金属腔屏蔽效能(SE)的四种快速算法——传输线等效电路法、EMT法、ILCM法、Modal-MOM法的适用性进行评估,为不同实际工程问题选用恰当的算法提供了依据.为了解决传统SE结果描述方法不适用于快速算法适用性评估的问题,采用绝对误差和曲线相关系数这两个参数,提出SE随金属腔和孔缝尺寸单独变化的Contour图描述方法.在此基础上,利用864组不同形状、尺寸矩形金属腔的SE计算结果,分析并确定了四种SE快速算法满足不同计算精度时适用的腔体模式数.结果表明,在同等计算精度条件下,Modal-MOM算法可适用的腔体模式数最多,ILCM算法次之,而传输线等效电路法适用腔体模式数最少,这些结果为实际工程应用提供了指导.