基于Biexponential基电流传输线通道模型的地闪回击近场电磁环境

地闪回击过程中产生的雷电电磁脉冲作为一种场强幅度大,频谱分量复杂的高功率电磁脉冲,其在回击近场区会形成极为复杂的电磁环境。随着微电子技术的快速发展,微电子设备电磁敏感度大大提升,从三维空间入侵的雷电电磁脉冲对于电子及电气设备的电磁危害不仅限于干扰其正常工作,更有甚者会造成设备的损毁。利用基于Biexponential基电流函数的传输线通道模型,模拟地闪回击物理过程以研究回击近场区综合电磁环境。研究结果表明:利用基于时域有限差分法的XFDTD电磁场仿真软件,可以便利地获得形象直观的回击近场区三维电磁场分布情况。回击近场区复杂的电磁环境会严重影响电子设备的正常运行,近场区LEMP的电磁危害不可小觑。

Calculation of Near-Field Electromagnetic Field of Lightning Return Stroke Based on Channel-base current model With Biexponential Function

The lightning electromagnetic pulse generated during the lightning return stroke is a high-power electromagnetic pulse with large field strength and complex spectral components, which will form an extremely complex electromagnetic environment in the near field. With the rapid development of microelectronics technology, the electromagnetic sensitivity of microelectronic devices has been greatly soared. The electromagnetic hazard of lightning electromagnetic pulses invaded from three-dimensional space is not limited to disturbing its normal work, but also causes damage to equipment. In this paper, the transmission line channel model based on Biexponential base current function is used to simulate the lightning return stroke physical process to study the comprehensive electromagnetic environment of the near field. The research shows that the XFDTD electromagnetic field simulation software based on the finite difference time domain method can easily obtain the visual and intuitive response to the three-dimensional electromagnetic field distribution in the near-field region. The complex electromagnetic environment in the near-field region will have a serious impact on the normal operation of electronic equipment. The electromagnetic hazard of LEMP in the near field area should not be underestimated.