Practical Computation Of Electromagnetic
Wave Coupling To Transmission Lines For The
EMC Engineer
Author(s)
D. A. Larrabee
Abstract
One cause of electromagnetic interference is the coupling of electromagnetic fields
to system wiring. A simple model for this is a two wire transmission line. Utilizing
this model without radiation loss terms can result in large errors even when the
wavelength is large compared to the wire spacing. Computer programs that solve
Maxwell’s equations do not have this problem. However, such calculations are
computationally expensive.
An alternative is to compute only the peak resonant frequencies and their amplitude
using a transmission line model which includes a radiation resistance term.
We present such a model and show that this approach can lead to significant
improvements in the accuracies of the predictions, with significantly less computational
time.
Keywords: transmission lines, electromagnetic compatibility, radiated susceptibility,
radiation resistance, NEC.
1 Introduction
One major source of electromagnetic interference is caused by the interaction of
electromagnetic waves with the system wiring. In the very low frequency limit
(wavelength much larger than system size) the interaction can be modeled by discrete
components between the two interacting systems. As the wavelength
becomes smaller than the cables, but larger than the spacing between the cables
this can be modeled by a modified transmission line approach [1–7]. As the wavelength
becomes increasing small the system is correctlymodeled with a full electro
magnetics code. Each step in the process increases the complexity of the analy-
Keywords
transmission lines, electromagnetic compatibility, radiated susceptibility,
radiation resistance, NEC
Related Book
Other papers in this volume
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