吉赫横电磁波传输室传输特性的宽频带分析

WIDE BAND ANALYSIS OF TRANSMISION CHARACTERISTICS IN GTEM CELL

吉赫横电磁波传输室(GTEM cell)上限工作频率可达几个吉赫,因而在电磁兼容测量中得到越来越广泛的重视和应用。本文在非正交坐标系下采用FDTD(时域有限差分)法求解电磁波在GTEM cell中的传输特性,给出了GTEM cell中TEM模的横向分布和纵向分布,分析了高阶模对场分布均匀性的影响,由此确定了GTEM cell的上限工作频率范围,计算及分析结果对GTEM cell的设计和使用具有重要意义。

The TEM cell is limited in the upper useful test frequency but GHz TEM (GTEM) cell permits to overcome this restriction. This paper analyzes the transmisssion characteristics in GTEM cell using FDTD method in the nonorthogonal coordinate. The field distributions have been calculated and the upper useful frequency has been analyzed. The results are of great value to the using and designing of GTEM cells.