Analysis of the measured field structure in a GTEM 1750

Abstract

An experimental field mapping (x, y, z components) of a GTEM 1750 has been performed in important parts and locations of this asymmetrical waveguide. The measurement results of deviations from the perfect TEM wave reveal some non TEM components as a function of exciting frequency and measurement location. A review of the present state of theoretical and experimental research with respect to immunity is given. An attempt is made to simulate a generic GTEM 500 section by using a 3-D finite difference time domain code. A comparison with measured data is presented, including the analysis of fundamental problems in the presently used standardized field sensor instrumentation.<>