Fushe yanjiu yu fushe gongyi xuebao (Jun 2021)
Exposure characteristics of 5G mobile phone antenna and its temperature field distribution in the human head
Abstract
In order to study the effect of specific absorption of electromagnetic radiation and temperature field distributions from 5G mobile phone antenna on the human head, the multi band 5G mobile phone model and three-layer spherical head model representing the scalp, skull and brain layers of the human head tissue were established using COMSOL simulation software. The special absorption rate (SAR) and temperature field distribution of each layer of the human head caused by electromagnetic exposure of mobile phones with two kinds of commonly used antenna input power and four kinds of working frequencies were simulated. The simulation results showed that, for the two input powers, the maximum SAR value in the scalp layer is 0.715 W/kg at 1 900 MHz, and the corresponding surface temperature is the highest, reaching a value up to 37.209 °C. When the distance from the mobile phone to the head increases from 5 mm to 30 mm, the maximum SAR value decreases by 50.20%, however, the maximum temperature field reduction is only 0.180%. The simulation results showed that all SAR values and temperature field distributions are lower than the limits prescribed by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Based on the results, the distribution of electromagnetic radiation and temperature field in the human head caused by 5G mobile phone antenna is considered safe.
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