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Abstract-Temperature increase analysis has been performed with consideration to the anatomical model of the human head exposed to a cellular phone operating at 900 MHz. Four different numerical methods, in particular an implicit method based on the Alternating Direction Implicit technique (ADI), were applied to solve the BioHeat Equation (BHE), their advantages and limitations were compared using a canonical case. The tests performed on the latest have shown that the implicit approach is well adapted to solve this type of equations. The rise of temperature in the human head exposed to the RF emission of a mobile phone with a radiated power of 250 mW at 900 MHz was analyzed. In addition the influence of the presence of the telephone kit close to the head was discussed. The influence of different thermal parameters such as the thermal conductivity and the blood perfusion coefficient on the rise of temperature has been analyzed.The simulation carried out showed that the maximum temperature increase in the internal tissues linked to SAR deposition does not exceed 0.1 • C. We recorded a temperature difference of 1.6 • C in the skin due to the presence of a switched off cellular phone, which has been confirmed by the experimental measurements performed.

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This study analyzes the main parameters that should influence the specific absorption rate (SAR) in children's heads. The evolution of their head shape and the growth of specific parameters, such as the skull thickness, are analyzed. The influence of these parameters on the radio frequency (RF) exposure of children's head is studied. The SAR over 1 g in specific tissue is assessed in different children's head models based on magnetic resonance imaging (MRI) and on non-uniformly down-scaled adult heads. Comparisons with SAR data in adults are reported using a handset with a patch antenna operating at 900 MHz.