Transient radiation field of a circular loop antenna

For a circular loop antenna excited by a frequency-hand-limited rectangular voltage pulse, the time variation of the electric field at remote points in various directions has been computed. The computations are for a loop of radius
b
made from wire of radius
a
, for which the thickness parameter
\Omega = 2 \ln (2\pi b/a) = 15
. The moment method was used in obtaining the current distribution on the loop due to each harmonic component in the excitation. Then the transient field is obtained by using the harmonic current distribution due to each frequency component of the exciting voltage pulse.