Abstract

The latest electromagnetic safety guidelines define transmitted or epithelial power density as the basic restriction above 6 GHz. In this note, we derive an approximation for a conservative transmission coefficient for quasi plane wave incidence as a function of the frequency for the normal component of the Poynting vector with respect to the evaluation plane or tissue surface |S_{z inc}| and for its modulus ||S_inc||. The maximum transmission coefficient for the normal component of the Poynting vector ${\boldsymbol{T}}_{\mathbf{z}}^{\mathbf{max}}$ is 1 independent of tissue composition and frequency. Approximations of ${\boldsymbol{T}}_{\mathbf{total}}^{\mathbf{max}}$ normalized to ||S_inc|| for thin and thick stratum corneum are provided allowing higher exposures. These approximations allow to conservatively demonstrate compliance with basic restrictions when quasi plane-wave conditions are locally satisfied and enhancement effects of standing waves between source and body can be neglected. The reported results are important to regulators and standardization bodies regarding revisions of compliance requirements and safety guidelines.

中文翻译：

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功率密度在6和300 GHZ之间向皮肤组织的传输系数

摘要

最新的电磁安全准则将传输或上皮功率密度定义为6 GHz以上的基本限制。在本说明中，我们推导了准平面波入射的保守传输系数的近似值，它是相对于评估平面或组织表面的Poynting向量法向分量的频率的函数。S _{z inc} | 以及模量|| S _inc ||。Poynting向量的正常分量$ {\ boldsymbol {T}} _ {\ mathbf {z}} ^ {\ mathbf {max}} $的最大透射系数是1，与组织组成和频率无关。标准化为|| S _inc的$ {\ boldsymbol {T}} _ {\ mathbf {total}} ^ {\ mathbf {max}} $的近似值|| 提供用于角质层的薄层和厚层，以允许更高的暴露量。这些近似值可以在局部满足准平面波条件并且可以忽略源和物体之间驻波的增强效应时保守地证明符合基本限制。报告结果对于监管者和标准化机构修订合规性要求和安全准则很重要。