生物组织内置源的电磁波能量吸收模型及仿真试验

Electromagnetic Power Absorption Model of Radiation Source in Biotic Tissue and Simulation Experiment

生物组织电磁能量吸收的研究多集中在外置辐射源的远场。利用比吸收率和电磁场之间的关系可以研究生物组织对内置源的电磁波能量的吸收情况。建立了内置电磁波能量吸收的数学模型,并根据模型进行了仿真试验。仿真试验的结果表明:生物组织对电磁能量的吸收随电磁波频率和组织材料电导率的增大而增大,当频率大于1GHz时,能量吸收急剧增大,而且能量吸收主要发生在辐射源的近场区域内。能量吸收也与组织厚度存在正比关系,但这种影响相比于频率的影响显得非常微弱。建模和仿真的结果可用于体内微系统的无线通信模块设计。

Almost all of the studies on the electromagnetic power absorption in biotic tissue are in far field of the radiation source outside the biotic tissue. The relationship between the specific absorption rate and electromagnetic field can be used to investigate the electromagnetic power absorption in biotic tissue in near filed of the radiation source inside the biotic tissue, The mathematic model on electromagnetic power absorption in biotic tissue was built and, based on it, the simulation experiments were carried out. The results of simulation show that the power absorption increases with the rising of electromagnetic wave frequency and conductivity of biotic tissue. When the frequency exceeds the 1GHz, the power absorption has a rapid augment and the most power absorption happens in near field of the radiation source. The power absorption is also in direct proportion with the thickness of the tissue. However, the influence of the thickness of the tissue for the power absorption is weaker than that of frequency. The model and results of simulation will be used to the design of the wireless communication module in the human body.