FDTD Evaluation of the SAR Distribution in a Human Head Near a Mobile Cellular Phone

Authors : Selçuk Paker

Pages : 227-242

View : 15 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this study, Finite-Difference Time-Domain insert ignore into journalissuearticles values(FDTD); method is used to calculate the Specific Absorbtion Rate insert ignore into journalissuearticles values(SAR; defined as the power absorbed by unit mass of the tissue); distribution in a human head near a hand-held cellular phone. A three dimensional FDTD algorithm is built in cartesian coordinates. A discrete human head model, derived from a Nuclear Magnetic Resonance insert ignore into journalissuearticles values(NMR); image by semi-automatic algorithm, is located within FDTD volume together with a discrete hand-held receiver model. FDTD simulations are carried out for both european GSM insert ignore into journalissuearticles values(operating at 900MHz); and DECT insert ignore into journalissuearticles values(operating at 1.8GHz); systems with a quarter-wavelength antenna, mounted on top of the hand-held cellular phone. A new and an effective way of calcuating input, radiated and absorbed power distributions is introduced where time-domain Poynting vector is traced over a closed virtual surface surrounding the discrete phone and head models. SAR distributions for various vertical and horizontal slices of the human head are calculated and are shown to agree with the available calculation and measurement results. The computational results are interpreted in terms of international safety guideliness for human health.
Keywords : Turk J Elec Eng Comp Sci, 6, 1998, 227 242 Turk J Elec Eng Comp Sci, vol 6, iss 3