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1 概述 飞机机身蒙皮是对外部干扰场有效的屏蔽体,并能大大地减小内场的辐射。 飞机蒙皮的屏蔽效能是一个用分贝衰减值表示的插入损耗,它包括电磁波穿越蒙皮出现的吸收损耗和由于空气-金属交界面的阻抗不连续,对入射波产生的反射损耗以及内部损耗。一般来说,吸收损耗是比较低的,随频率的升高而升高。对平面波来说,磁性材料能形成最佳的吸收损耗,而良导体能形成更高的反射损耗。当材料对电磁波的吸收衰减大于15dB的时候,内部反射可以不考虑。由于飞机蒙皮材料厚度很小,在这种情况下,内部反射
1 Overview Aircraft fuselage is an effective shielding against external disturbances and can greatly reduce the radiation in the field. The shielding effectiveness of an aircraft skin is an insertion loss expressed in decibel attenuation, which includes the absorption loss experienced by electromagnetic waves passing through the skin and the reflection losses and internal losses to the incident waves due to discontinuities in the impedance of the air-metal interface. In general, the absorption loss is relatively low, rising with increasing frequency. For plane waves, the magnetic material produces the best absorption loss, while the good conductor produces a higher reflection loss. When the material on the electromagnetic wave absorption attenuation greater than 15dB, the internal reflection may not be considered. Due to the small thickness of the aircraft skin material, in this case internal reflection