某机载计算机电磁辐射分析与抑制研究

摘要

机栽计算机外接电缆无法采取屏蔽措施时将导致计算机对外电磁辐射水平升高,为了避免机载计算机电磁辐射水平超出规定的范围,需要采取更加有效的电磁辐射抑制措施.通过分析某型号机载计算机的电气组成,找出了影响其电磁辐射水平的主要因素；依据延长电磁辐射传播路径,增加辐射路径上的电磁波损耗的思路在总线选型、电磁辐射路径规划、辐射衰减方法、电磁屏蔽设计、PCB设计、接地设计和电磁辐射测量等几方面提出了行之有效的电磁辐射抑制方法.试验结果表明,方法可以有效地解决电磁辐射的问题.%Airborne computer external cable cant take shielding measures,it will lead to the rising of the electromagnetic radiation levels.In order to avoid Airborne computer electromagnetic radiation level beyond the prescribed scope,it is necessary to take more effective electromagnetic radiation suppression measures.By analyzing the airborne computer electrical components,the paper proposed the main factors that influence the electromagnetic radiation level;According to extending the electromagnetic radiation propagation path and increaseing the Propagation path loss of electromagnetic wave,we proposed the effective method of the electromagnetic radiation suppression base on bus selection,electromagnetic radiation path planning,radiation attenuation method,electromagnetic shielding design,PCB design,grounding design and electromagnetic radiation measurements.The experiment results show that the above method can effectively solve the problem of electromagnetic radiation.