中文摘要：

为了有效评估B型地铁车载双八木天线对地铁司机射频电磁场暴露的安全性,利用3维电磁仿真软件构建了在双八木天线辐射下的地铁司机室射频电磁环境模型。通过设计司机室、车载双八木天线和司机人体模型,数值模拟了天线在不同输入功率条件下对司机人体模型的射频电磁场暴露影响。仿真结果表明,当地铁实际运行时的天线输入功率达到最大值200 m W时,人体模型中质量为10 g的任意相邻组织内的平均比吸收率（specific absorption rate,SAR10 g）的峰值为0.018 649 W/kg,电场强度的峰值为16.201 V/m,磁场强度的峰值为0.176 16 A/m,峰值皆出现在躯干组织中,且都低于国际非电离辐射委员会（International Commission on Non-Ionizing Radiation Protection,ICNIRP）制定的职业电磁暴露限值,说明司机在此射频电磁场暴露环境中是安全的。分层头模型的仿真结果表明,平均比吸收率在大脑组织中的穿透深度大于电场强度和磁场强度。

英文摘要：

In order to assess the security of radio frequency（RF） electromagnetic field generated by double yagi-uda antennas in the subway cab, we established a subway cab＇s RF electromagnetic environment model which was radiated by the double yagi-uda antennas by using three-dimensional electromagnetic simulation software. Through designing the cab, double yagi-uda antennas, and the human model of driver, we numerically simulated the influence of human model which was exposed to the RF electromagnetic environment under different antenna＇s input power. The simulated results showed the maximum value of specific absorption rate averaged by any 10 g of contiguous tissue （SARlo g） was 0.018 649 W/kg, the maximum value of electric field intensity was 16.201 V/m and the maximum value of magnetic field intensity was 0.176 16 A/m when the antenna＇s input power was maximum value 200 mW. All the maximum values appeared in the trunk tissue and lower than electromagnetic occupational exposure restriction values constituted by International Com- mission on Non-Ionizing Radiation Protection （ICNIRP）. This investigation demonstrates that the RF electromagnetic radiation environment in the cab is safe enough to driver. The specific simulated results of layer head model reveal that the penetration depth of SAR10 g is deeper than the electrical field intensity and the magnetic field intensity in the brain tissue.