双面金属涂敷材料对高空电磁脉冲的屏蔽

计算了绝缘材料双面金属涂敷结构对高空电磁脉冲(HEMP)的屏蔽效果。针对HEMP 特点,理论和数值分析表明:对常用材料,同样的总金属厚度,从一定频率起,绝缘材料双面金属涂敷的屏蔽效果优于单层同种金属涂敷。该起点频率受到绝缘材料厚度以及金属电导率的影响,绝缘材料厚度越大、金属电导率越大,起点频率越低,屏蔽效果越好。绝缘材料的介电常数对屏蔽性能的影响可忽略。

The Shielding Effectiveness of Insulating Material with Metalon Both Side for HEMP

Shielding effectiveness of insulating material with metal on both side for HEMP is analyzed. Take the char-acteristics of HEMP into consideration, some conclusions are obtained for common used materials, if the total thickness of themetal is the same, shielding effectiveness of double-layer metal which has insulating material between them is better than thatof single-layer metal when frequency is larger than a specific frequency point. The frequency point depends on the thicknessof the insulating material and the conductivity of the metal. As the thickness of the insulating material and the conductivity ofthe metal getting larger, the frequency of the point is getting lower while the shielding effect is better. The relative permittivi-ty of the insulating material between the double-layers metal has little shielding effectiveness.