Describes a theoretical analysis of the illumination of a hollow, conductive object containing a wire by a non-planar wave. Much EMC testing is performed at antenna-test object separation distances that are small compared to the wavelength. The authors show that such 'near-field' (Fresnel zone) testing produces coupling responses markedly different from that encountered due to plane wave (where the wave impedance is 377 ohm) incidence. There is practical verification for this-in 1983, the effect was noted in an aircraft trial.
The effects of variations in wave impedance in the coupling of large lossy bodies to external electromagnetic fields
Auswirkungen von Änderungen der Wellenimpedanz bei der Kopplung großer verlustbehafteter Körper mit externen elektromagnetischen Feldern
1991
, 2 Quellen
Conference paper
English
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