摘要
Abstract
In order to improve the ability of the electronic components in the equipment to resist electromagnetic interfer-ence from the environment and other internal components,the transmission line method(TLM)is applied in this paper to con-vert the model of double layer metallic enclosure with apertures and load circuit boards to circuit diagram,and the calculation formula of enclosure center shielding effectiveness is deduced with the circuit diagram. The Matlab is adopted to generate the shielding effectiveness curve. The model is established and simulated with the simulation software CST. The simulation results match well with the Matlab output curve,which verifies the correctness of the calculation formula. The effects of some factors (such as the PCB size,quantity,putting way and the distance to aperture) on shielding effectiveness are analyzed by CST. In order to fit the realistic situation,the circuit board loading the integrated operational amplifier circuit was used to analyze the shielding effectiveness and the effect of shielding enclosure on the function of the circuit board. Finally,some approaches to im-prove shielding effectiveness are proposed.关键词
双层屏蔽腔/电磁屏蔽效能/印制电路板/传输线法Key words
double-layer shielding cavity/electromagnetic shielding effectiveness/print circuit board/transmission-line method分类
信息技术与安全科学
