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Ch83-I044963.fm Page 409 Monday, August 7, 2006 11:30 AM
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ANALYTICAL AND EXPERIMENTAL
MODELING OF INTRA-BODY
COMMUNICATION CIRCUIT

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Y. Terauchi , K. Hachisuka , K. Sasaki , Y. Kishi , T. Hirota ,
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H. Hosaka , K. Fujii 2 and K. Ito 3
1
Graduate School of Frontier Sciences, The University of Tokyo,
Bunkyo-ku, Tokyo 113-8656, JAPAN
" Graduate School of Science & Technology, Chiba University,
Chiba-city, Chiba 263-8522, JAPAN
3
Research Center for Frontier Medical Engineering, Chiba University
Chiba-city, Chiba 263-8522, JAPAN
ABSTRACT
Intra-body communication uses human body as the propagation medium. This may become a new
wireless communication method for Personal Area Network (PAN) with less power consumption and
higher communication security compared to conventional RF methods. A common analytical model of
intra-body communication is a combination of capacitive coupling among the human body, electronic
devices, and the environment. Experimental results suggest that there are optimal parameters for
transmission. We assume that it is a combination of not only the capacitive couplings, but also of a
radio wave transmission and of imbalances in the electrical impedances among the
transmitter/receiver electrodes attached to the human body.

KEYWORDS

Personal Area Network, intra-body communication, analytical model, human body equivalent
phantom, phase measurement

INTRODUCTION
Advancement of information technology has accelerated the spread of ever smaller and lighter
information and communication devices such as mobile phones, PCs, and PDAs. It is common to see
people carrying more than one of these devices. In the near future, the devices will most likely become
wearable. Data and system resources can be shared by connecting multiple devices carried by a single
person, similar to computers in offices connected by a LAN. This new type of network was proposed
in Zimmerman (1995) as a Personal Area Network (PAN).