Power Density and SAR in Multi-Layered Life Tissue at Global System Mobile (GSM) Frequencies

Khitam El Wasife

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DOI: 10.4236/jemaa.2011.38052                

Abstract

In this paper, the power density and specific absorption rate (SAR) distribution in multi-layered life tissues and exposed to electromagnetic field emitted from handheld cellular phone operating in the 900 MHz and 1800 MHz is studied. We modeled a life tissue by four layered system to represent skin-fat-muscles-organs respectively. Matlab program and finite difference time domain (FDTD) computations were used to evaluator the electric, magnetic field, power density and specific absorption rate. A one dimensional FDTD algorithm has been built, some simulations for electromagnetic wave through the life tissue is made. Results show that electro magnetic fields penetrate the life tissues and attenuate fast to reach zero at the organs layer. The absorbent power and SAR show maximum at the skin and fat layers.

Keywords

Electromagnetic Waves, Life Tissues, Specific Absorption Rate, Power Density, Finite Difference Time Domain Method (FDTD)

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	C. R. Fernández, G. Bulla, A. C. Pedra and A. A. A. de Salles, “Comparison of Electromagnetic Absorption Characteristics in the Head of Adult and a Children for 1800 MHz Mobile Phones,” IEEE Transactions on Microwave Theory and Techniques,Vol. 49, No. 12, 2001, pp. 2539-2546.
[2]	N. Homsup and T. Jariyanorawiss, “FDTD Simulation of a Mobile Phone Operating near a Metal Wall,” Journal of Computers, Vol. 4, No. 2, 2009, pp. 168-175. doi.:10.4304/jcp.4.2.168-175
[3]	R. Luebbers, C. W. Penney and Remcom Inc, “FDTD Comparison of SAR and Temperature Rise in Human Tissue,” IEEE Electromagnetic Compatibility, Vol. 3, No. 1, 2004, pp. 1036-1038.
[4]	P. Bernardi, M. Cavagnaro, S. Pisa and E. Piuzzi, “SAR Distribution and Temperature Increase in an Anatomical Model of the Human Eye Exposed to the Field Radiated by the User Antenna in a Wireless LAN,” IEEE Transactions on Microwave Theory and Techniques, Vol. 46, No. 6, 1998, pp. 2074-2082. doi:10.1109/22.739285
[5]	G. Emili and A. Schiavoni, “Computation of Electromagnetic Field Inside a Tissue at Mobile Communications Frequencies,” IEEE Transactions on Microwave Theory and Techniques, Vol. 51, No. 1, 2003, pp. 178- 186. doi:10.1109/TMTT.2002.806899
[6]	A. Talflove, “Computational Electrodynamics,” Artech House, Norwood, 1995.
[7]	A. Abdalla and A. Teoh, “A Multi-Layered Model of Human Head Irradiated by Electromagnetic Plane Wave of 100 MHZ - 300 GHZ,” International Journal of Scientific Research, Vol. 15. No. 2, 2005, pp. 1-7.
[8]	C. Gabriel and S. Gabriel, “Compilation of the Dielectric Properties of Body Tissues at RF and Microwave Frequencies,” Internet Document, 1996. http://niremf.ifac.cnr.it/docs/DIELECTRIC/Report.html
[9]	K. S. Yee, “Numerical Solution of Initial Boundary Value Problems Involving Maxwell’s Equations in Isotropic Media,” IEEE Transactions on Antennas and Propagation, Vol. 14, No. 3, 1966, pp. 302-307.
[10]	M. Witting, S. Burkhardt and Sican Res. & Dev. GmbH, “Automatic Generation of Finite Difference Meshes by an Evolutionary Algorithm,” IEEE Transactions on Magnetics, Vol. 32, No. 36, 1996, pp. 1338-1340. doi:10.1109/20.497493
[11]	IEEE C95.1-1991, “IEEE Standards for Safety Levels Respects to Human Exposure to Radio Frequency Electromagnetic Fields, 3 KHz to 300 GHz,” Institute of Electrical and Electronics Engineers, Inc., New York, 1992.
[12]	U. A. Fill, M. Zankl, N. Petoussi-Henss, M. Siebert and D. Regulla, “Adult Female Voxel Models of Different Stature and Photon Conversion Coefficients for Radiation Protection,” Health Physics, Vol. 86, No. 3, 2004, pp 253-272.
[13]	J. X. Li. and Z. Q. Niu, “Theory of Biological Electromagnetic,” Xidin University Press, Xi’an, 1990.