Abstract
Abstract. TEM-cells can be used as a standardized field generator for field probe calibration purposes or electromagnetic compatibility measurements. Because of its practical use as a measurement environment, the electromagnetic behavior over a broad range of frequencies is essential. However, without the understanding of wave reflection, mode-conversion, and attenuation, using such a measurement environment is impractical. In this contribution, we calculate the electromagnetic fields in a longitudinal irregular coaxial TEM-cell. Using a semi-analytical approach, we can determine these wave characteristics. The method is based on the projection of Maxwell's equations onto eigenfunctions. This work's primary objective is to examine the effect of irregular deformed boundaries on the electromagnetic field and the resonance frequencies.
Highlights
The electromagnetic (EM) field is well defined and sufficiently uniform to be useful in the calibration of EM field probes or electromagnetic compatibility (EMC) measurements
To derive the Generalized Telegraphist’s Equations (GTEs) for a two-port coaxial TEMcell, we introduce a set of appropriate orthogonal coordinates (u, v, z). u and v are transverse coordinates, and for convenience, the z-axis coincides with the TEM-cells z-axis
5 Discussion of numerical results Before examining the effect of longitudinal irregularly deformed boundaries on the EM fields and the resonance frequencies fri, we verified our numerical results of the GTEs for an ideal and regular TEM-cell
Summary
Koch (1999) has made the first attempt to thoroughly investigate closed TEM-Cells (Crawford- and GTEM-cells) using GTEs. The mode coupling mechanism in an ideal coaxial TEM-cell with circular cross-section has been investigated, and numerical results were shown in Pham and Garbe (2020). Because the GTEs can not directly calculate the resonance frequencies fr of the TEM-cells, an approximated method was presented in Pham et al (2020). In this contribution, the GTEs are used to investigate the effects of mechanical tolerances on the electromagnetic fields in coaxial TEM-cells.
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