RADIATION OF PULSED DIPOLE ANTENNAS

Using the Jefimenko generalization of the Biot-Savart law and the Lapl ace transform we analyse the electromagnetic radiation of a vertical d ipole antenna fed with a pulsed current. We get the magnetic field fro m the vector potential directly while the electric field is obtained t hrough Maxwell's equations. We write explicitly the expressions of the electromagnetic field for an exponentially decaying pulse and for a t runcated harmonic pulse in vacuum and in a dispersive dielectric of th e ionosphere type.