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Transmission Model and Circuit Design for Communication Method that uses Human Body as part of the Transmission Medium

以人体作为传输介质的通信方法的传输模型和电路设计

基本信息

批准号：
18560365
负责人：
SASAKI Ken
金额：
$ 2.26万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560365/
关键词：
Telecommunication Advanced Communication Electronic Devices User Interface Wearable Devics

项目摘要

Transmission method that uses human body as part of its transmission medium, which we will refer to as "intra-body communication" hereafter, is one of the promising technologies for communication between electronic devices. The objective of this research was to clarify the transmission model, and to establish circuit design method so that electronic engineers can readily utilize this technology in practical applications. Impedance matching was first investigated in order to obtain optimum input impedance for receivers. When the receiver in embedded in a stationary equipments or apparatus, the optimum input impedance was 2000 ohm to 2800 ohm at carrier frequency of MHz, and 180 ohm to 330 ohm at 20 MHz. The optimum input impedance decrease as the carrier frequency increases. Maximum gain was obtained at 10MHz. When the receiver was attached to the wearer of the transmitter, which means that the receiver is not connected to stationary devices, the optimum input impedance of the receiver was 80 to 200 ohm. The impedance of the medium, which is the human body in this case, is necessary for design of output stage of the transmitter. This impedance was measured by using output transformers of different transforming ratios. At carrier frequency of 10MHz, the output impedance was approximately 190 ohm Maximum transmission efficiency will be achieved by designing the final stage of the transmitter to match this impedance.Furthermore, impedance characteristics of electrode structures of wearable transmitter for body-centric networks were analyzed by TLM (Transmission Line modeling) method. Relationships of electrode dimensions and arrangements were organized in a set of equations for electrode design. These equations can be utilized to determine the size and arrangement of electrodes for a given impedance value of the transmission channel in intra-body communication.

利用人体作为其传输媒介的传输方法，以下我们将称之为体内通信，是电子设备之间通信的最有前途的技术之一。本研究的目的是澄清传输模型，并建立电路设计方法，以便电子工程师能够在实际应用中方便地使用这项技术。为了获得最佳的接收机输入阻抗，首先对阻抗匹配进行了研究。当接收器嵌入固定设备或装置时，最佳输入阻抗在载频为MHz时为2000-2800欧姆，在20 MHz时为180-330欧姆。最佳输入阻抗随载波频率的增加而减小。在10 MHz处获得了最大增益。当接收器连接到发射器的佩戴者时，这意味着接收器没有连接到固定设备，接收器的最佳输入阻抗是80到200欧姆。在这种情况下，介质(在这种情况下是人体)的阻抗是发射机输出级设计所必需的。使用不同变换比的输出变压器测量了该阻抗。在载波频率为10 MHz时，输出阻抗约为190欧姆，通过设计与此阻抗匹配的末级发射机，可获得最大的传输效率。此外，利用传输线建模(TLM)方法分析了身体中心网络可穿戴发射机电极结构的阻抗特性。电极尺寸和排列的关系被组织成一组用于电极设计的方程。这些公式可用于在体内通信中确定给定传输通道阻抗值的电极的大小和布置。