An FDTD analysis of induced current in PEC wire which touched semi-infinite ground plane by using surface impedance boundary condition
An FDTD analysis of induced current in PEC wire which touched semi-infinite ground plane by using surface impedance boundary condition
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DOI：
10.1109/aps.2010.5561088
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
T. Arima;Soichi Watanabe;K. Wake;T. Uno
中科院分区：
文献类型：
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作者：
T. Arima;Soichi Watanabe;K. Wake;T. Uno
研究了人体站在甚高频半无限接地面上暴露时的空穴体共振现象。在这种现象中，在人体内观察到强烈的感应电流。在国际准则中，暴露的限制被规定为100。另一方面，甚高频被广泛应用于广播、无线电通信等领域。因此，对人体感应电流的分析是非常重要的。得到了该问题的Green函数[3]，[4]，因此，矩量法（MOM）可用于求解该问题。然而，该计算中包含了sommerfeld积分，sommerfeld积分不容易收敛，因此，用MoM来分析问题非常困难。时域有限差分法被广泛应用于人体模型分析，因为将包含组织电学特性的数值人体数据作为体素模型提供，体素数据可以方便地纳入时域有限差分法分析。本文采用时域有限差分法。图1显示了半无限地平面上的散射体。在时域有限差分分析中，在计算空间的末端需要一个特殊的边界截断分析。为了实现半无限地平面，采用了PML吸收边界条件。然而，与自由空间[5]的PML相比，与有耗地面匹配的PML需要大量的计算资源。在参考文献[6]中，我们提出了利用表面阻抗边界条件（SIBC）对半无限地平面进行建模的有效方法。但是，SIBC不能应用于接触地面平面散射体的情况。本文将SIBC技术推广到与半无限接地板接触的PEC导线中感应电流的计算中。
The hole-body resonance phenomenon is observed when a human is standing on the semi-infinite ground plane exposure of VHF waves [1]. In this phenomenon, intensive induced current is observed in the human body. In international guidelines, the limitations of the exposures are provided [2]. On the other hand, the VHF waves are widely used as broadcasting, radio communication and so on. Therefore analysis of the induced current in a human body is very important. The Green function for the problem was obtained [3],[4], therefore, the Method of Moment(MOM) can be used for solving this problem. However, the sommerfeld integral is included in this calculation, the sommerfeld integral is not convergence easily, so, it is very difficult to analyze the problem by using MoM. The FDTD method is widely used to analyze a human body model, because, the numerical human data including the electric property of tissue is provided as the Voxel model, the Voxel data can be included to FDTD analysis easily. In this paper, the FDTD method is used. Fig.1 shows a scatterer on the semi-infinite ground plane. In the FDTD analysis, a special boundary is needed to truncate the analysis at the end of computation space. In order to realize semi-infinite ground plane, the PML absorbing boundary condition is used. However, the PML which matched with lossy ground is needed huge computation resources by comparison with the PML for free space[5]. In Ref.[6], we proposed efficient modeling method to model semi-infinite ground plane by using surface Impedance boundary condition(SIBC). However, the SIBC cannot be applied to the case of scatterer is touched ground plan. In this paper, we expand the SIBC technique for calculation of induced current in PEC wire which touched semi-infinite ground pane.