加载横电磁传输室中的电场分布计算

Calculation of electric field distribution in TEM cell with EUT

用“准静场法”研究了当工作频率远低于截止频率时 ,放置于横电磁传输室( TEM Cell)中的被测物体 ( EUT)中的电场分布。文中使用的是有限差分法 ,给出了在三维空间中不同介质交界面上拉普拉斯方程的差分格式。计算结果表明当把 EUT放入 TEM Cell的中心时 ,EUT横截面上的电场分布是均匀的。EUT内的电场比其外部的电场减小了 ,其比例关系与 EUT的长度和相对介电常数有关。这些结果对于TEM Cell在微波化学和生物医学工程中的应用具有指导意义。

Here the distribution of the electric fields in transverse electromagnetic (TEM) cell was calculated by using of the finite difference method.Where the TEM cell with equipment under tests (EUT)was introduced to study the biologic effects of electromagnetic fields.The quasi static condition was used when TEM cell was utilized in the range of frequencies far below its cutoff frequency.A special difference grid mesh of Laplace's equation at the interface of the different medium was presented also.The results showed that the electric field at the cross section of EUT was homogeneous.And that the electric field inside the EUT was smaller than that out of the EUT.These results are useful for the study of biologic effects of electromagnetic fields and microwave chemistry.