| The rapid development of portable consumer electronics products and health care market promotes the reformation of information technologies. Human body communication (HBC) technology takes human body as data channel to reduce the complexity of monitor systems, which has new historical meanings and wide application prospects.This thesis firstly reviews the research status of HBC, compares three coupling ways and analyzes tissue structure and channel model. On this basis, a more practical multiple layer tissue structure HBC system model is built, and mechanism & characteristic of signal transmission are explored from the angle of interaction between EMF and human body. With simulation, this thesis analyzes the signal decay rate in different directions, obtains the best communication frequency band, and analyzes various influence factors, like distance between transceiver and body surface, electrode size and space, etc, providing guidelines further development of HBC.The simulation results show that in HBC, electromagnetic signal transmission possesses the characteristics of surface wave, field strength decays slowly along body surface while rapidly away; electrical field has different decay attenuation constants when parallel and perpendicular to body surface and perpendicular component is stronger than parallel one; 500-600MHz is the best frequency band in 0-1000MHz; good communication can be achieved with transceiver separated from body surface and signal mainly propagates in 5mm range from body surface; transceiver should be suitable for receiving perpendicular component and its structure needs improvement for higher signal receiving efficiency. |
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