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应用电磁场理论探讨了频率为2450MHz的平面电磁波垂直射到皮肤-肌肉组织表面上的反射和透射问题.结果表明,43％的能量透入人体组织,57％反射回空气.若在人体表面上放置一层相对介电常数ε_r=7.19、厚度d=10.89mm、天磁性的绝缘介质,从理论上讲可将能量透射系数提高到99.99％.接着引入输入波阻抗的概念,把理论推广到多层媒质的情况.然后,用此理论研究了平面电磁波垂直射到皮肤-脂肪-肌肉三层人体组织模型上的增透问题.显示,只要给出皮肤和脂肪层的厚度,即可从理论上求出使能量透射系数达到99.99％的增透介质层的厚度和相对介电常数.
The electromagnetic field theory was used to study the reflection and transmission of the plane electromagnetic wave perpendicular to the skin-muscle tissue at a frequency of 2450 MHz. The results showed that 43% of the energy penetrates human tissues and 57% reflects back to the air. The dielectric constant of a layer of ε_r = 7.19, the thickness of d = 10.89mm, magnetic insulation medium, in theory, the energy transmission coefficient can be increased to 99.99%. Then introduced the concept of input impedance, the theory extended to a multi-layer Medium.Then, using this theory, we studied the anti-seepage problem of the plane electromagnetic wave vertically penetrating skin-fat-muscle three-layer human tissue model.It is shown theoretically that the thickness of the skin and the fat layer can be obtained theoretically The thickness and relative permittivity of the anti-reflection medium layer with an energy transmission coefficient of 99.99% are obtained.