关键词: 人体通信, 时域有限差分, 非均匀介质人体模型, 植入式信道

Abstract: Implantable communication system is an important component of Body Area Network （BAN）, and it has bright prospects, especially in medical monitoring, disease diagnosis and assistive technology for persons with disability. In this paper, a multi-layer heterogeneous medium model of human tissue is developed by using Finite Difference Time Domain （FDTD） theory. And then, by means of implanted different channel on-and in body tissue, the research of the characteristic of implantable Human Body Communication （HBC）. Firstly, the human body model of multi-layer is founded, then considering that dielectric properties of human tissue are depend on frequency. In order to solve the problem of α, β and γ dispersion, the complex relative permittivity of the human tissue should be approximated by the Debye model. Secondly, the four different channels of on-body to on-body, on-body to in-body, in-body to on-body and in-body to in-body is investigated through simulation in HBC link. Furthermore, the propagation characteristics of HBC channels in rang of 0.3 MHz to 100 MHz are analyzed. Finally, the communication channel implanted experiment proves the feasibility of the inhomogeneous multi-layered model. Based on the analysis on the characteristic of implantable communication propagation, it is concluded that the channel path-loss is related with the distance and high pass property. The in vivo communication channel have more advantage into the HBC mechanism.

Key words: human body communication, finite-difference time-domain, multi-layer body structure, implantable communication channel