Correlation between Mass-Averaged SAR and Temperature Elevation in Human Head Model for RF Near-Field exposure from 1 to 6 GHz

摘要

This paper discusses the correlation between the mass-averaged specific absorption rate (SAR) and temperature elevation in anatomically based Japanese head models for a dipole antenna operated from 1 to 6 GHz. A homogeneous rectangular parallelepiped model is also used as a basis for the investigation. Our attention is focused on the effect of averaging mass of SAR on the correlation with local temperature elevation. An averaged SAR over 10 g was found to reasonably correlate with local temperature elevation even for frequencies from 3 to 6 GHz. The dominant factor influencing the correlation between mass-averaged SAR and temperature elevation is suggested to be the thermal diffusion length, together with the penetration depth of electromagnetic waves. The ratio of local temperature elevation to mass-averaged SAR is largely influenced by the blood perfusion rate, while at most 20% for different Japanese head model.