基于电磁拓扑理论的多孔缝场线耦合分析

为了使电子系统在复杂电磁环境中可以正常工作,通常要对电子系统进行屏蔽处理。但是在屏蔽墙表面不可避免的要开一些小孔,用于通风或者散热等用途,因此出现了多孔屏蔽的问题。基于电磁拓扑理论,分析了位于多孔屏蔽墙后传输线终端对外界电磁波入射的响应。采用偶极子等效原理处理孔缝问题,利用基于Agrawal模型的扩展BLT(Baum-Liu-Tesche)方程给出屏蔽墙后传输线终端感应电流的计算公式。最后计算结果表明:开孔屏蔽层对外界电磁波有明显的屏蔽作用,且屏蔽层上的开孔位置和开孔数量会直接影响传输线的终端响应。

Analysis of Field-to-Transmission Line Coupling ThroughMulti-apertures Based on Electromagnetic Topology

In order to make the electronic system work well under the complex electromagnetic environment, electronic system is usually required to be installed in the shutter. However, for the ventilation and heat dissipation, it is inevitable to make some tiny apertures on the shielding wall, so there has been the problem of multi-apertures shielding. Based on the electromagnetic topology theory, we analyze the terminal response of one transmission line excited by external electromagnetic field, which is behind a shielding wall with multi-apertures. By using the equivalent dipole method and the extended BLT (Baum-Liu-Tesche) equation which is based on the Agrawal model, the equation of induced current of the transmission line can be acquired. Finally, numerical results show that the shielding effectiveness of the shielding wall with apertures is significant against the external field, and the terminal response of transmission line can be affected by the location and the number of apertures.