This article deals with the development of computation
method dedicated to the extraction of the transient EM-near-field at certain
distance from the given 2D data for the baseband application up to GHz. As
described in the methodological analysis, it is based on the use of fft
combined with the plane wave spectrum (PWS) operation. In order to verify
the efficiency of the introduced method, a radiating source formed by the
combination of electric dipoles excited by a short duration transient pulse
current with a spectrum bandwidth of about 5 GHz is considered. It was shown
that compared to the direct calculation, one gets the same behaviors of
magnetic near-field components Hx, Hy and Hz with the presented
extraction method, in the planes placed at {3 mm, 8 mm, 13 mm} of the
initial reference plane. To confirm the relevance of the proposed transform,
validation with a standard commercial tool was performed. In future, we
envisage to exploit the proposed computation method to predict the transient
electromagnetic (EM) field emissions notably in the microwave electronic
devices for the EMC applications.