以PCB为干扰源的带孔机箱电磁辐射特性仿真研究

Numerical Simulation on the Electromagnetic Radiation Performance of Enclosure with Apertures Excited by PCB

对电子设备进行电磁辐射特性的研究,不仅要考虑机箱表面孔缝的电磁泄露,更要考虑机箱内部干扰源的电磁辐射特性.本文提出一种将PCB的电磁辐射能量导入机箱内部作为干扰源的方法,用于计算电子设备的整机电磁辐射特性,并与耦合微带线作为内部干扰源的方法进行对比.基于本文提出的将PCB作为干扰源的方法,研究了开孔尺寸、开孔类型、开孔位置对电子设备电磁辐射特性的影响,所总结的规律可为电子设备的工程设计提供一定参考标准.

In order to study the electromagnetic radiation performance of enclosure with apertures,not only the electromag- netic leakage caused by apertures, but also the electromagnetic radiation performance of PCB should be comidered. In this paper, a new method of importing electromagnetic energy of PCB into enclosures as the interference source was developed and compared with the coupling mierostrip method. Based on the method considering PCB as the interference source, the relationship between the aperture size,type and location with the electromagnetic radiation performance were intensively studied.Some conclusions were obtained and they can be helpful guidelines for electronic equipment design.