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The use of the frequency-dependent finite-difference time-domain method for induced current and SAR calculations for a heterogeneous model of the human body

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3 Author(s)
Furse, C.M. ; Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT, USA ; Chen, Jin-Yuan ; Gandhi, O.P.

This paper describes the use of the previously formulated frequency-dependent finite-difference time-domain ((FD)2TD) method for analysis of an anatomically based heterogeneous man model exposed to ultra-wide-band electromagnetic pulse sources. The human tissues' electrical permittivities, εi*(ω) are described by Debye equations with two relaxation constants, and the equation D(t)=ε*(ω))E(t) is converted to a finite-difference equation along with the Maxwell's equations used by the standard FDTD method. Using a single run with a broad-band pulse excitation, the (FD) 2TD method is used to calculate mass normalized rates of energy deposition (specific absorption rates or SARs) and induced currents in the man model over a broad band of frequencies. Time-domain coupling of a representative ultrashort pulse of subnanosecond rise time and nanosecond pulse duration to the human body is also examined

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Electromagnetic Compatibility, IEEE Transactions on  (Volume:36 ,  Issue: 2 )