ABSTRACT The total-field/scattered-field (TF/SF) boundary can be considered as a special source in the finite-difference time-domain method (FDTD). In contrast, to the direct addition of a current source, simulations can be performed by adding excitations in the waveform by setting the TF/SF boundary. However, certain leakage always occurs when loading the closed TF/SF boundary, which leads to an error in both the total-field and scattered-field regions. To overcome this limitation, this paper proposes a novel technique to eliminate the leakage in the TF/SF boundary. In particular, the causes for the leakage are analyzed, and a new structure involving input and output layers is established and perfectly embedded in the classical TF/SF boundary. The new boundary can eliminate the leakage generated between the total-field and scatter-field regions. Numerical simulations in two dimensions involving excitations via Gaussian pulses and a sinusoidal signal indicate that a zero-leakage state can be attained, as opposed to the minimum leakage of −300 dB attained using existing approaches, both in the total-field and scattered-field regions, irrespective of the occurrence of scattering.

中文翻译：

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通过在未封闭的 TF/SF 边界中嵌入输入和输出层来消除泄漏，从而实现准确的模拟。

摘要 总场/散射场 (TF/SF) 边界可被视为有限差分时域法 (FDTD) 中的特殊源。相比之下，对于直接添加电流源，可以通过设置 TF/SF 边界在波形中添加激励来执行仿真。然而，加载封闭的 TF/SF 边界时总会发生一定的泄漏，这会导致总场和散射场区域的误差。为了克服这一限制，本文提出了一种消除 TF/SF 边界泄漏的新技术。特别是，分析了泄漏的原因，建立了一个涉及输入和输出层的新结构，并完美地嵌入了经典的 TF/SF 边界。新边界可以消除总场区和散射场区之间产生的泄漏。