电子仪器中敏感元器件的屏蔽

Shielding for sensitive components in the electronic instrument

电磁屏蔽是电磁兼容技术的主要措施之一,对于电子仪器中的一些敏感元器件或敏感电路,必须采取必要的屏蔽措施进行保护,以提高元器件的抗干扰性和整机的可靠性。本文介绍了电子设备电磁兼容设计中电场屏蔽、磁场屏蔽、电磁屏蔽的机理,着重介绍在电子仪器中对敏感元器件进行有效屏蔽的措施,对屏蔽效能进行了理论分析,并举例说明屏蔽效能的计算方法,最后提出进行此类屏蔽设计的一般方法。

Electromagnetic shielding is one of the main methods of electromagnetic compatibility technologies. It is necessary that the indispensable shield means are used to increase the antijamming capability of the components and the reliability of the whole machine. This paper deals with the shielding mechanism of EMC design for electronic equipment, especially introduces the effective methods of electromagnetism shielding for sensitive components in the electronic instrument. Then, the calculating method of shielding effectiveness is illustrated by an example of practical application. At last, the author gives the general means how this kind of shielding is designed.