论文标题
了解磁性和磁质领域在人体交流中的作用
Understanding The Role of Magnetic and Magneto-Quasistatic Fields in Human Body Communication
论文作者
论文摘要
随着可穿戴技术的出现，人体通信（HBC）已成为一种物理上安全且有效的替代品，替代了原本无处不在的无线身体区域网络（WBAN）。 HBC的研究最多的节点是电和电质量（EQS）电容和电力的，但最近磁HBC（M-HBC）被认为是可行的替代方案。以前的工作已经通过应用的观点调查了M-HBC，而没有为此开发基本的工作原则。在本文中，首次进行了基础分析，以通过详细的电磁模拟和支持实验来研究M-HBC中人体通道在M-HBC中的可能影响和贡献。结果表明，虽然M-HBC可以成功作为人体区域网络运行，但人体本身在其功能中起着最小或微不足道的作用。对于少于30 MHz的频率，在磁质质（MQS）HBC的运行域中，人体对准矛盾的磁场是透明的。相反，对于较高的频率，人体组织的导电性最终会衰减由于人体组织中诱导的涡流引起的磁性HBC场，从而消除了人体支持有效的波导模式的可能性。有了这种更好的理解，对于高阻抗电容和50欧姆终止案例，已经概述了MQS HBC的不同操作模式，并且在TX和RX之间的不同距离内，它们的性能与EQS HBC的性能与EQS HBC进行了比较。最终的报告介绍了对M-HBC操作的首个基本理解及其与EQS HBC的对比，这是帮助HBC设备设计人员根据应用程序模式做出的设计决策的。
With the advent of wearable technologies, Human Body Communication (HBC) has emerged as a physically secure and power-efficient alternative to the otherwise ubiquitous Wireless Body Area Network (WBAN). Whereas the most investigated nodes of HBC have been Electric and Electro-quasistatic (EQS) Capacitive and Galvanic, recently Magnetic HBC (M-HBC) has been proposed as a viable alternative. Previous works have investigated M-HBC through an application point of view, without developing a fundamental working principle for the same. In this paper, for the first time, a ground up analysis has been performed to study the possible effects and contributions of the human body channel in M-HBC over a broad frequency range (1kHz to 10 GHz), by detailed electromagnetic simulations and supporting experiments. The results show that while M-HBC can be successfully operated as a body area network, the human body itself plays a minimal or negligible role in it's functionality. For frequencies less than about 30 MHz, in the domain of operation of Magneto-quasistatic (MQS) HBC, the human body is transparent to the quasistatic magnetic field. Conversely for higher frequencies, the conductive nature of human tissues end up attenuating Magnetic HBC fields due to Eddy currents induced in body tissues, eliminating the possibility of the body to support efficient waveguide modes. With this better understanding at hand, different modes of operations of MQS HBC have been outlined for both high impedance capacitive and 50 Ohm termination cases, and their performances have been compared with EQS HBC for similar sized devices, over varying distance between TX and RX. The resulting report presents the first fundamental understanding towards M-HBC operation and its contrast with EQS HBC, aiding HBC device designers to make educated design decisions, depending on mode of applications.
