Signal Transmission Characteristics and Biosafety Evaluation of Magnetically Coupled Intra-Body Communication using Numerical Electromagnetic Field Analysis
Signal Transmission Characteristics and Biosafety Evaluation of Magnetically Coupled Intra-Body Communication using Numerical Electromagnetic Field Analysis
复制标题
使用数值电磁场分析的磁耦合体内通信的信号传输特性和生物安全性评估
DOI：
10.11308/tjsst.13.1
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
伊藤建一
中科院分区：
文献类型：
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作者：
Fujioka I;Ohtsu H;Yonemoto N;Sase K;Murashima A.;伊藤建一
本研究通过计算机模拟评估了磁耦合体内通信的信号传输特性、人体内和周围的电磁场分布以及生物安全标准。分析的磁耦合是一个正常的电感耦合（非谐振耦合）和两种类型的谐振耦合。目标评估区域是前臂和上身，我们分析了高达100 cm的线圈间距离，这被认为是假设的人体通信范围。信号路径损耗的频率特性的结果与之前相同，其显示在每个线圈距离处，电感耦合的信号损耗量在2至3 MHz之间最小化;其中一个谐振耦合可以在2 MHz的谐振频率下将信号路径损耗改善约20 dB。此外，当信号电压为1V时，体内的电场强度比一般环境极限值小两个数量级以上。局部比吸收率小约4个数量级;因此，得出结论，磁场方法对活体非常安全。
This study evaluated the signal transmission characteristics, the electromagnetic field distributions in and around the human body, and the biosafety criteria of magnetically coupled intra-body communication through computer simulation. The analyzed magnetic couplings were a normal inductive coupling (non-resonant coupling) and two types of resonant couplings. The target evaluation regions were the forearm and upper body, and we analyzed up to an inter-coil distance of 100 cm, which is considered to be the assumed human body communication range. The results of the frequency characteristics of the signal path loss, which were the same as before, revealed that the amount of signal loss for the inductive coupling was minimized between 2 and 3 MHz at each coil distance; one of the resonant couplings could improve the signal path loss by approximately 20 dB at a resonant frequency of 2 MHz. Furthermore, when the signal voltage was 1 V, the electric field strength in the body was smaller than the general environmental limit value by more than two orders of magnitude. The local specific absorption rate was smaller by approximately four orders of magnitude; thus, it was concluded that the magnetic field method is very safe for the living body.