高频低能电磁环境头颅内电场应力分析

Analysis of Electric Stress in Human Head in High-frequency Low-power Electromagnetic Environment

电磁辐射会对人体产生什么作用一直是人们关心的问题。鉴于电磁波会在不连续媒质中产生电场应力,文中采用时域有限差分(FDTD)法数值研究处于辐射功率1 W、双频(900 MHz和1 800 MHz)PIFA天线产生的高频低能环境中头颅内的电场应力及其分布,并从是否达到人的听觉阀值的角度对手机辐射安全性进行了评价。结果表明:两种高频低能环境中头颅内介电常数不同的组织界面处均存在电场应力,且最大电场应力点均位于手机侧的皮肤和空气界面处,颅骨处产生的电场应力峰值均未达到由骨组织传导引起听觉的阀值,故不能产生听觉效应。

Action of electromagnetic radiation exerting on human body has been a concerned issue for people.Because electromagnetic waves could generate an electric stress in a discontinuous medium,we used the finite difference time domain（FDTD）as calculation methods to calculate the electric stress and its distribution in human head caused by high-frequency low-power electromagnetic environment,which was generated by dual-band（900 MHz and 1 800MHz）PIFA antennas with radiated power 1 W,and we then performed the safety evaluation of cell phone radiation from the angle whether the electric stress further reached the human hearing threshold.The result showed that there existed the electric stress at the interface of different permittivity organization caused by the two kinds of high-frequency low-power electromagnetic environment and the maximum electric stress was located at the interface between skin and air of the phone side,and the electric stress peak at skull did not reach the threshold of auditory caused by bone tissue conduction so that it can not produce auditory effects.