中文摘要：

目的手机的电磁辐射对人体的影响愈加受到关注。由于可能存在的潜在危害，常用大鼠作为实验对象。本文拟了解实验中电磁场在大鼠头部的分布情况，便于更好地设计大鼠辐照实验。方法首先建立手机天线和大鼠头部模型，利用HFSS电磁场仿真软件对电磁场在大鼠头部的分布进行仿真分析，计算出大鼠脑部各区域的比吸收率（specific absorption rate，SAR）。结果大部分电磁场被靠近天线一侧的头皮和头骨吸收，到达颅内的电场强度约为总电场强度的1／4。SAR分布与电场相似，随着脑区与天线距离的增大，其SAR值减小，颅内的SAR值约为头骨部分的1／4。结论文中建立的大鼠头部模型和仿真计算方法有助于了解手机电磁场在大鼠脑内的具体分布。

英文摘要：

Objective The electromagnetic radiation of mobile phones has caused a great public concern about their possible biological effects. Considering that electromagnetic radiation has a potential hazard to human body,rats are usually used to do long-time exposure experiments instead of human. We investigate the distribution of electromagnetic field inside the rat head to guide experiments. Methods The electromagnetic field simulation software HFSS was used in the paper to analyze the distribution of electromagnetic field and the specific absorption rate （SAR） inside the rat head. Results Most of the electric energy was absorbed by the skin and skull on the side near the antenna, a quarter of the electric energy penetrated into the brain. SAR distribution was similar to that of electromagnetic field, and decreased with the distance to antenna. Conclusions The rat model and simulation can help to understand the specific distribution of mobile phone electromagnetic fields inside the rat head.