掺还原铁粉混凝土板反射和透射性能

通过控制混凝土板的厚度、混凝土板中还原铁粉掺量、在混凝土板中加钢丝网,研究混凝土板对电磁波的反射和透射性能。反射率测量采用弓形架测试方法,透射衰减测量采用两端口测试方法。混凝土板对电磁波的反射率测试频段为2~18GHz,透射衰减测试频段为12~18GHz。不同的混凝土板对电磁波的反射率在-5dB左右。40mm厚的混凝土板中还原铁粉的掺量超过200kg/m3时,电磁波的透射衰减量可达到-50dB以上。通过分析实验结果,发现混凝土板的厚度、混凝土板中还原铁粉掺量和钢丝网对反射率大小影响较小,对透射衰减量影响较大。

Reflection and transmission performances of concrete slabs mixed with reduced iron powder

We studied the reflection and transmission performance by controlling the thickness of the concrete slabs and the mixing amount of reduced iron powder and introducing wire netting into the concrete slabs. We used a bow-frame for the test of reflectivity and a two-port method for the test of transmission attenuation. The frequency band of the reflectivity ranges from 2 to 18 GHz. The frequency band of the transmissions measurement ranges from 12 to 18 GHz. The reflectivity of different concrete slabs is around -5 dB. When the mixing amount of reduced iron power in concrete slabs is above 200 kg/m3, the transmission attenuation can reach －50 dB. By analyzing experimental results, we can find that the concrete slabs thickness, the mixing amount of reduced iron powder and the wire netting have heavy effect on transmission attenuation, but little effect on reflectivity.