电磁波穿透墙体的衰减特性

Attenuation characteristics of electromagnetic wave penetrating walls

应用平面电磁波理论和菲涅耳公式分析了电磁波穿透不同介质的衰减特性,对不同的极化方式、入射角、介电常数、电导率、损耗角正切和频率下,电磁波在介质间的透射性能及介质中的传输衰减特性进行了分析,对常见的普通混凝土墙、37砖墙、24砖墙、石膏空心板、水泥泡沫板、木板和玻璃与频率的衰减特性进行了数值仿真,比较了新砌混凝土墙、实心粘土砖墙和多孔粘土砖墙的损耗特点,将仿真结果与实际测量及参考文献测量结果进行了比较,结果表明仿真的墙体频率衰减趋势与实际测量结果一致,衰减数值接近并略低于实测结果。

The propagation attenuation characteristics of electromagnetic wave penetrating different media are analyzed applying the theory of the electromagnetic plane wave and Fresnel formulas. They are numerically compared by adopting different parameters such as polarization, incident angle, dielectric permittivity, conductivity, tangent of dielectric loss angle and frequency. The total transmission loss versus frequency is simulated for often-used walls such as common concrete wall, 37 brick wall, 24 brick wall, hollow plasterboard, cement board with polystyrene, wood block and organic glass. The attenuation characteristics of new walls and hollow clay brick walls are analyzed. The simulation results are also compared with laboratory measurements and that from referenced literatures, which shows that the simulative results of attenuation versus frequency agrees well with the measurements in trend, and a bit lower than that.