基于CST泡沫铝通风窗屏蔽性能的有限元模拟

Simulation of Ventilation Window Shielding Performance of Aluminum Foam base on CST

针对通风窗屏蔽材料进行了分析研究，运用三维电磁场仿真软件CST（computersimulationtechnology）仿真了几种常用通风窗结构的屏蔽效果，经对比发现，多孔泡沫材料在屏蔽效果上具有一定优势。研究了频率、孔径和孔棱对多孔泡沫材料屏蔽效果的影响，为高孔隙率泡沫金属在电子设备和屏蔽室等方面的研究及应用提供了参考。从模拟角度出发，运用三维电磁场仿真软件CST，研究了泡沫铝多孔材料的屏蔽性能，并将开孔泡沫铝与蜂窝截止波导通风窗进行了仿真对比，研究发现，在两者尺寸参数相差不大的情况下，开孔泡沫铝与蜂窝截止波导通风窗的屏蔽性能相差不大；然而，开孔泡沫铝具有更好的防尘效果以及成本上的优势。研究了频率、孔径和孔棱对泡沫铝屏蔽性能的影响，结果显示，其在0～1GHZ频段的屏蔽性能逐渐减小，同时孔径和孔棱尺寸都会影响泡沫铝的屏蔽性能。

Shielding material of ventilation window was analyzed and studied in the paper, the shielding effect of several common ventilation window structure was simulated by the 3D electromagnetic field simulation software CST （computer simulation technology）, and porous foam material has certain advantages in the shielding effect,which is found by compari- son. The frequency, pore size and pore edges on shielding properties of porous material are studied then, which can provide help for the research and application of high porosity metal foam in electronic equipment, shielded room and so on. By simu- lant considerations, aluminum foam electromagnetic shielding performance is simulated by using electromagnetic simulation software CST. open-cell aluminum foams and Honeycomb cut-off waveguide of ventilation window are simulated and com- pared. With two dimensions of similar circumstances, the study found that difference between the shielding properties of open-cell aluminum foams and Honeycomb cut-off waveguide of ventilation window is not significant, but the open-cell alu- minum foams has obvious advantages in terms of collection performance and cost. The frequency, pore size and pore edges on shielding properties of aluminum foam are studied, results show that the performance in 0-1 GHz band shielding decrea- ses, while the pore size or pore edges will affect the shielding performance the foamed aluminum.