A Study of Human Body Effects on Intra-Body Communications

• Main Authors: Chih-chuan Hung, 洪志權
• Other Authors: Ken-huang Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/26hz49

碩士 === 國立中山大學 === 電機工程學系研究所 === 97 === In this thesis, we introduce the fundamental operation of intra-body communications. The efficiency of the intra-body communications and the disturbance of intra-body communication are also studied. Intra-body communications propagate the signal by using the surface of human skin. Our study is mainly based on simulation. The accuracy of the simulation is verified by comparing with results in two papers. Then, five tissues are used to represent in the simulation. Firstly, we find design rules of transmitter and receiver for improving efficiency. The larger size of the circuit board is, the stronger signal receives. Length is more sensitivity than width but electrodes cannot be close. The signal does not vary widely with the location of the receiver. By setting proper parameters of skin, we can differentiate between wet skin and dry skin. Because the conductivity of wet skin is higher than dry one, the wet skin will give a stronger received signal. In the latter part of the thesis, we study the parameters cause the disturbance of intra-body communications. First, we study the effects of the person is close to the system. Second, we discuss the changes of the impedance of the system when another person touches the user. In the last, we discuss the variety of the receiving signal due to the bending of the arm, furthermore, we can distinguish the angles of the arm’s bend from the coupling of electric field.