TEM传输室多层介质支撑特性阻抗的数值分析

Numerical analysis of characteristic impedance of TEM cell with multilayered dielectric media brace bar

采用边界元法分析了芯板支撑对TEM传输室特性阻抗的影响。介绍了建模方法，以及边界元法计算多介质区域特性阻抗的基本思想。计算结果表明：芯板支撑对特性阻抗的影响比较显著，随材料介电常数的不同，影响值一般为2-5Ω左右。测量结果与计算结果基本吻合。提出的数值计算方法有助于TEM传输室的设计。

The effect of septum brace bar on the characteristic impedance of TEM cell was analyzed by boundary element method （BEM） in this paper. The modeling method and the BEM theory of dealing with the characteristic impedance of multilayered dielectric media were introduced. The calculated results indicate that the brace bar has serious effect on the characteristic impedance of TEM cell, generally it reduces the characteristic impedance about 2~512 for different dielectric constant of material. The measured results agree very well with the calculated ones. The method proposed is contributive to the design of TEM cell.