Abstract
This chapter presents the application of finite element method (FEM) to calculate the influence of EUT to characteristic impedance in Gigahertz Transversal Electromagnetic Mode (GTEM) cell two-dimensional cross section. In general, the GTEM cell is considered as the rectangular coaxial transmission line, it is difficult to solve the characteristic impedance using traditional analysis and semi-analysis method. The variations of the characteristic impedance in GTEM cell induced by grounding and un-grounding metal EUT are compared. The relation between the characteristic impedance and the EUT relative size is discussed, when the EUT is dielectric material. The useful references are presented for GTEM cell design and application. The evidence to evaluate the uncertainty of the measurement using GTEM cell, and the maximum size of the EUT can be determined according to the curves. The GTEM cell is a 50 Ω tapered rectangular coaxial transmission line with an offset center septum.
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