人体组织液特性对SAR值的影响及修正模型

Impacts of Tissue-equivalent Liquid Properties onSAR and the Correction Model

比吸收率(specific absorption ratio,SAR)值测量所使用的组织液特性与规范标准中给出的组织液目标值会有一定偏差。此时,需要对SAR值的测量结果进行修正。针对此问题,提出了一种修正模型,修正模型基于电磁仿真的方法建立。通过在835 MHz频点与IEC 62209\IEEE 1528标准中的数据进行比较,对建模方法进行了验证。基于此建模方法,给出了3.5 GHz及28 GHz这2个下一代移动通信备选频段下的SAR值修正模型。使用此修正模型将减小SAR值测量的不确定度,进而提升各测量实验室间SAR符合性评定结果的一致性。使用此修正模型的另一个好处在于,该修正模型允许更大的组织液特性偏差,这将有助于降低SAR值测量的成本。

To determine a correction model that can be used to correct the measured specific absorption rate(SAR)in a homogeneous phantom when its dielectric properties deviates from standardized target values.The correction model is established based on the method of electromagnetic numerical simulation.The method is verified by comparison with the data in the IEC 62209\IEEE 1528 standards at 835 MHz.Based on the method,correction models at 3.5 and 28 GHz,which are the candidate bands for the future communication systems,are proposed.Employing the correction models reduces the SAR measurement uncertainty,thereby improving the reproducibility of SAR compliance assessment between laboratories.Another benefit is that it enables the use of broadband tissue-equivalent liquids,whose dielectric parameters are not currently within the tight tolerances of existing standards.The use of broadband liquids reduces the cost of SAR measurement.