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电子学报  2014 

三维FDTD方法中高效平面波源的引入

DOI: 10.3969/j.issn.0372-2112.2014.06.008, PP. 1086-1089

Keywords: 分裂平面波FDTD方法,分裂场,平面波

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Abstract:

应用分裂平面波时域有限差分(SplittingPlanewaveFiniteDifferenceTimeDomain,SP-FDTD)方法到三维时域有限差分(FiniteDifferenceTimeDomain,DFDTD)中引入高效平面波源.该方法基于分裂场思想,在一维FDTD上构造了新的迭代公式,使得一维FDTD和三维FDTD离散网格之间的数值相速度一致,消除了由于相速不一致而在总场区引起的泄漏误差以及插值带来的数值误差.通过数值算例验证了SP-FDTD方法对不同波源在任意角度(斜入射)下的平面波入射都是有效的,且泄露误差均在-300dB水平.

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