Analysis of wave propagation on human body based on stratified media model

Abstract

Human body communication (HBC) is a promising near-field communication (NFC) method emerging in recent years. But existing theoretical models of HBC are too simple to simulate the wave propagation on human body. In this work, in order to clarify the propagation mechanism of electromagnetic wave on human body, a surface waveguide HBC theoretical model based on stratified media cylinder is presented. A numerical model analyzed by finite element method (FEM) is used for comparing and validating the theoretical model. Finally, results of theoretical and numerical models from 80 MHz to 200 MHz agree fairly well, which means that theoretical model can characterize accurate propagation mechanism of HBC signal. Meanwhile, attenuation constants derived from two kinds of models are within the range from 1.64 to 3.37, so that HBC signal can propagate effectively on human body. The propagation mechanism derived from the theoretical model is useful to provide design information for the transmitter and the modeling of the propagation channel in HBC.

Keywords

human body communication / surface waveguide / propagation mechanism / stratified media / propagation constant; attenuation constant

References

[1] ZimmermanT GPersonal area networks (PAN): Near-Field intrabody communication [D], 1995CambridgeMassachusetts Institute of Technology, School of Architecture and Planning1-25

[2] ShinagawaM, FukumotoM, OchiaiK, KyuragiH. A near field sensing transceiver for intra-body communication based on the electro-optic effect [J]. IEEE Transactions on Instrumentation and Measurement, 2004, 53(6): 1533-1538

[3] SongJ S, ChoN, YooH. A 0.2-mW 2-Mb/s digital transceiver based on wideband signaling for human body communications [J]. IEEE Journal of Solid-State Circuits, 2007, 42(9): 2021-2033

[4] ChoN, YooJ, SongJ S, LeeJ, JeonS, YooH J. The human body characteristics as a signal transmission medium for intrabody communication [J]. IEEE Transactions on Microwave Theory and Techniques, 2007, 55(5): 1080-1086

[5] ChoN, BaeJ, YooH J. A 10.8 mW body Channel communication/MICS Dual-Band transceiver for a unified body sensor network controller [J]. IEEE Journal of Solid-State Circuits, 2009, 44(12): 3459-3468

[6] ChoN, YanL, BaeJ, YooH J. A 60 kb/s-10 Mb/s adaptive frequency hopping transceiver for interference resilient body channel communication [J]. IEEE Journal of Solid-State Circuits, 2009, 44(3): 708-717

[7] LeeH, RohT, BaeJ, YooH J. A 60?W 10Mb/s fully digital FSK demodulator for power-jitter efficient medical BAN [C]. IEEE Asia Pacific Conference on Circuits and Systems, 2010Kuala LumpurIEEE Press504-507

[8] WegmuellerM S, OberleM, FelberN. Galvanical coupling for data transmission through the human body[C]. IMTC 2006-Instrumentation and Measurement Technology Conference, 2006SorrentoIEEE Press1686-1689

[9] WangJ Q, NishikawaY, ShibataT. Analysis of on-body transmission mechanism and characteristic based on an electromagnetic field approach [J]. IEEE Transactions on Microwave Theory and Techniques, 2009, 57(10): 2464-2470

[10] BaeJ, ChoH, SongK, LeeH, YooH J. The signal transmission mechanism on the surface of human body for body channel communication [J]. IEEE Transactions on Microwave Theory and Techniques, 2009, 60(3): 582-593

[11] BaeJ, YanL, LeeH, ChoH, YooH J. Galvanical coupling for data transmission through the human body [C]. Asian Solid State Circuits Conference, 2011JejuIEEE Press181-184

[12] BaeJ, YanL, YooH J. A 20 ?W contact impedance sensor for wireless body-area-network transceiver [C]. 2011 IEEE Custom Integrated Circuits Conference, 2011San JoseIEEE Press1-4

[13] FCC. body tissue dielectric parameter tool [EB/OL]. [2012-04-13]. http://transition.fcc.gov/oet/rfsafety/dielectric.html

[14] BarlowH M, BrownJRadio surface waves [M], 1962OxfordOxford University Press1-28

[15] ChewW CWaves and fields in inhomogeneous media [M], 1995New JerseyIEEE Press1-209

[16] SolbachK. Slots in dielectric image line as mode launchers and circuit elements [J]. IEEE Transactions on Microwave Theory and Techniques, 1981, 29(1): 10-16

[17] QianY X, PerkonsA R, ItohT. Surface wave excitation of a dielectric slab by a Yagi-Uda slot array antenna-FDTD simulation and measurement [C]. Topical Symposium on Millimeter Waves, 1997KanagawaIEEE Press137-140