Study on SAR Distribution of Electromagnetic Exposure of 5G Mobile Antenna in Human Brain

Firstly, this paper establishes 5G mobile phone antenna and human head model. The performance characteristics of the two 5G mobile phone antennas were analyzed by HFSS (High Frequency Structure Simulator) software, and the electric field strength and specific absorption rate (SAR) distribution in the human head model under different antenna working frequency conditions were simulated. The simulation results show that: When the antenna operating frequency is 2600 MHz, the average SAR of any adjacent tissue with a mass of 10 g in the human head model is 0.217 W/kg, the peak of the electric field strength is 21.067 V/m, and the average frequency is 3500 MHz, the peak of the specific absorption rate is 0.285 W/kg, and the peak of the electric field strength is 22.844 V/m. Conclusion: Most of the electromagnetic field is absorbed by the scalp and skull near the antenna side. The SAR value reaching the brain is about 0.25 times of the total SAR value. The electric field strength is similar to the SAR value. As the distance between the brain region and the antenna increases, the SAR value decreases, and the SAR value in the brain is about 0.125 times that of the scalp. Compared with the limits set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), it is lower than the public electromagnetic exposure limit value 2 W/kg, which is in line with international standards.