多孔矩形腔电磁耦合拓扑分解与计算

Decomposition and Calculation of Electromagnetic Coupling and Topology with Multiapertures Rectangular Cavity

为了发挥电子系统在复杂电磁环境下的工作效能,通常要求对电子系统进行屏蔽处理。但是由于通风和散热需求,在屏蔽腔表面会开一些小孔,因此就出现多孔屏蔽问题。采用电磁拓扑的方法,建立了外部激励源通过多孔缝与内部电子系统之间的电磁交互作用拓扑图,结合电磁耦合的多步迭代算法,并应用CRIPTE软件进行外部场耦合到内部腔体,以及腔体内双导线的终端负载计算。数值计算表明:在多孔情况下需要考虑孔缝间的电磁交互、在同等屏蔽条件及散热要求下开多孔比开单孔更有利于电磁屏蔽、在同一系统中,电路离孔缝越远屏蔽效能越好,电路置于腔体侧面比正对孔缝屏蔽效能好。

In order to play the task performance of electronic system under the complex electromagnetic environment,electronic system is usually required to be installed in the shutter.However,with the requirement of ventilation and heat dissipation,some tiny apertures are made on the surface of the shielding cavity,which will adopt the method of electromagnetic topology,establish the topological interaction sequence diagram of electromagnetic interaction between external excitation source and internal electronic system through multiapertures,combine a multistep iterative algorithm of electromagnetic coupling,and calculate the electromagnetic effect from external field coupling to internal one and the terminal load of two-conductor line with the help of CRIPTE software.Numerical results illustrate that the interaction between apertures should be taken into consideration on the porous occasion;more apertures are conducive to electromagnetic shielding on even shielding and heat dissipating condition;the farther Distance between Circuit and aperture,the better the shielding effectiveness;putting the circuit in the side of the cavity will achieve better shielding effectiveness than facing the aperture.