A FREQUENCY-DEPENDENT FINITE-DIFFERENCE TIME-DOMAIN FORMULATION FOR DISPERSIVE MATERIALS
A FREQUENCY-DEPENDENT FINITE-DIFFERENCE TIME-DOMAIN FORMULATION FOR DISPERSIVE MATERIALS
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DOI：
10.1109/15.57116
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发表时间：
1990-08-01
影响因子：
2.1
通讯作者：
SCHNEIDER, M
中科院分区：
文献类型：
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作者：
LUEBBERS, R;HUNSBERGER, FP;SCHNEIDER, M
将传统的时域有限差分（FDTD）公式扩展为包含离散时域卷积，并使用递归有效地对其进行评估。通过计算空气-水界面在宽频带上的反射系数，包括水的频率相关介电常数的影响，证明了扩展的准确性。扩展到频率相关的磁导率和三维是很简单的。频率相关的FDTD公式允许计算与脉冲激励的几乎任何材料和几何形状（仅受计算机资源限制）的电磁相互作用。高度分散的材料，如雪、冰、等离子体和雷达吸收材料，可以有效地考虑使用该配方
The traditional finite-difference time-domain (FDTD) formulation is extended to include a discrete time-domain convolution, which is efficiently evaluated using recursion. The accuracy of the extension is demonstrated by computing the reflection coefficient at an air-water interface over a wide frequency band including the effects of the frequency-dependent permittivity of water. Extension to frequency-dependent permeability and to three dimensions is straightforward. The frequency dependent FDTD formulation allows computation of electromagnetic interaction with virtually any material and geometry (subject only to computer resource limitations) with pulse excitation. Materials that are highly dispersive, such as snow, ice, plasma, and radar-absorbing material, can be considered efficiently by using this formulation.<>