| Abstract: | ![]()
Spherical electromagnetic waves excited by external surface electric currents in a homogeneous isotropic space are considered. It is shown that, in contrast to the harmonic excitation, in the case when the electromagnetic field is excited by external-current pulses, there is always an isolated convergent spherical wave in a bounded space-time region. The possibility of the existence of an isolated convergent spherical wave in a bounded spatial region at all instants is investigated for the cases of harmonic and pulse electromagnetic field excitations. It is proved that such a wave can exist when the divergent spherical wave arriving from the origin is compensated with the use of additional external currents. The excitation of isolated convergent spherical waves is illustrated by examples. |
