On Averaging Mass of Sar Correlating With Temperature Elevation Due to a Dipole Antenna

Abstract

Abstract-This study investigated the relationship between temperature elevation and spatial-average SAR (specific absorption rate) in a head model of a Japanese male due to a dipole antenna. The frequencies considered are in the range between 800 MHz and 3 GHz, which are used in wireless communications. Our attention focuses on the average mass of SAR which maximizes the correlation with local temperature elevation. Computational results suggested that an appropriate averaging mass of SAR did not exist over wide frequencies, which was attributed to the frequency-dependent penetration depth of electromagnetic waves. For most cases considered in this study the SAR averaging over 10 g was better than that for 1-g from the standpoint of correlating the temperature elevation. The dominant factor influencing this averaging mass is the thermal diffusion length which largely depends on the blood perfusion rate. Additionally, the heat evolved in the pinna played an important role in the correlation between spatialaverage SAR and temperature elevation.

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

“…Since our interest concentrates on the temperature elevation in the body core that may induce a thermophysiological response, see the temperature distribution [8,9] for RF whole-body exposures Note that the thermal modeling for localized exposure can be found in [25][26][27].…”

Sar and Temperature Elevation in a Multi-Layered Human Head Model Due to an Obliquely Incident Plane Wave

“…The thermal parameters used in this study are given in Table 3 [12]. The convective heat transfer coefficient between the model surface and air (h) is set to 10.5 W/( • C m 2 ), which is the typical value of the free convection mode of air at room temperature.…”

Multiband Fractal Planar Inverted F Antenna (F-Pifa) for Mobile Phone Application

“…In addition, PIFAs can reduce the possible electromagnetic energy absorption by the mobile handset user's head, because of relatively smaller backward radiation toward the user. This antenna also is reasonably efficient and free of excessive radiation illuminating the user's head (low SAR value) [13][14][15][16][17][18].…”