电波科学学报2017，Vol.32Issue(2)：134-143,10.DOI:10.13443/j.cjors.2017011004
植入式人体通信中电磁波在不同组织分界面上的传播特性研究
Electromagneticwave transmission characteristics on different tissue boundaries for implantable human body communication
摘要
Abstract
Transmission characteristics of signal crossing the boundary of different tissues in human body are studied through calculating the incidence of electromagnetic wave at the tissue boundaries.Reflection coefficient, transmission coefficient and the expression of electromagnetic field are deduced from the boundary conditions firstly when the uniform plane electromagnetic wave incidence to the single layer and multi-layer mediums.Then the human arm is taken as a research object, and the fourth-order Cole-Cole model issued to obtain the dielectric parameters of body tissues in 10 Hz-100 GHz.After that, the maximum incident angle, reflection coefficient, transmission coefficient and average energy flux density on the boundaries are calculated when electromagnetic wave incidence to 1-layer, 2-layer and 3-layer tissues.The results show that electromagnetic wave is propagating through the multi-layer tissues mainly with the vertical incidence, the reflection coefficient on the boundary of skin and air is larger than any other tissues, the energy of electromagnetic wave is difficult to be transmitted inside and outside the body with a frequency less than 1 MHz or larger than 10 GHz, the average energy flux density of electromagnetic wave presents band-pass characteristic with frequency, and the bandwidth and center frequency are related to the implantation position of device.Finally, a finite element simulation model of vertical incidence to the 3-layer human body tissues is built by using COMSOL Multiphysics.The differences between the simulation results and calculation results are less than 0.000 08, which verify the accuracy of the theoretical deduction and calculation.关键词
植入式人体通信/组织分界面/垂直入射/反射系数/平均能流密度Key words
implantable human body communication/tissue boundary/vertical incidence/reflection coefficient/average energy flux density分类
信息技术与安全科学引用本文复制引用
陈志英,高跃明,杜民..植入式人体通信中电磁波在不同组织分界面上的传播特性研究[J].电波科学学报,2017,32(2):134-143,10.基金项目
国家自然科学基金(U1505251) （U1505251）
