Transient radiation field of a pulse-excited linear antenna parallel to a conducting plane

For a finite length, cylindrical, dipole antenna parallel to a perfectly conducting plane and driven by a DC pulse, the time variation of the radiation electric field in different directions has been computed. The dipole is assumed to have a half-length-to-radius ratio of 904 and to be spaced a distance equal to its half-length from the conducting plane. The dipole is assumed to be driven by a generator whose internal impedance is 780 ohms (an average characteristic impedance of the antenna) and which produces a periodic waveform whose period is such that the transient field produced by one pulse has died out before the next pulse occurs. The pulse width was taken to be equal to four-tenths the time required for pulse transmission to the end of the dipole.