电磁辐射作用于计算机主板的模拟及效应评估
mulation and effect evaluation of electromagnetic radiation on computer motherboard
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摘要: 提出了一种电磁辐射（EMR）效应评估的方法：通过区域分解并且引入子域敏感因子，采用电场强度的加权平均作为EMR效应评估的参考指标。以一款普通计算机主板作为研究对象，使用时域有限差分法（FDTD）进行模拟计算，得到了EMR作用下计算机主板耦合的电磁场分布。基于该效应评估方法，比较了3~12 GHz 的平面电磁波在0°~90°入射时对计算机主板的效应。数值模拟结果表明：随着平面电磁波入射角度的增加，EMR对计算机主板的影响趋于减弱；EMR频率的变化对效应没有显著影响。当EMR入射角度为40°时，最高主板表面耦合的电场强度达到最大值；0°入射时，主板上平均电场强度达到最大值；随着入射EMR频率的升高，主板表面的最大电场强度趋于减弱。Abstract: An electromagnetic radiation (EMR) effect evaluation method is presented in this paper. The effect is ranked by the weighted average of the coupled electric field with domain decomposition and subdomain sensitive factors. Meanwhile, a facilitated electromagnetic model of a general purpose computer motherboard is built. Numerical simulation based on the Finite-Difference Time-Domain (FDTD) method is performed and the coupled electromagnetic field of the motherboard is achieved. EMR with incident angle from 0° to 90° at frequency from 3 GHz to 12 GHz is simulated and their effects are compared based on the developed evaluation method. Numerical results show that: (a) The larger the EMR incident angle is, the weaker the EMR effect is. The maximum weighted average of electric field is obtain
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Key words:
- emc /
- electromagnetic coupling /
- computer motherboard /
- electromagnetic radiation /
- evaluation /
- numerical simulation
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