电磁辐射作用于计算机主板的模拟及效应评估  

Simulation and effect evaluation of electromagnetic radiation on computer motherboard

作　　者：刘长军[1] 黄卡玛[1] 闫丽萍[1] 蒲天乐[1] 张文赋[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《强激光与粒子束》2006年第5期847-852,共6页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

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3～12GHz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。An electromagnetic radiation （EMR） effect evaluation method is presented in this paper. The effect is ranked by the weighted average of the coupled eleetrie field with domain decomposition and subdomain sensitive faetors. Meanwhile, a facilitated electromagnetic model of a general purpose computer motherboard is built. Numerical simulation based on the Finlte-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. Numerieal results show that; （a） The larger the EMR ineident angle is, the weaker the EMR effect is. The maximum weighted average of electric field is obtained when the incident angle is 10°. （b） The EMR effect on motherboard is not obviously dependent on its frequency. （c） The maximum coupled electric field on the motherboard is obtained when the EMR incident angle is 40°. A higher EMR frequency leads to a weaker maximum coupled electric field on the motherboard.

关 键 词：电磁兼容 电磁耦合 计算机主板 电磁辐射 评估 模拟 

分 类 号：O441.4[理学—电磁学]