Abstract: The cylindrical dipole antenna with a lumped resistive loading is considered as a radiator of ultra-wideband short-pulses. Specifically, the distribution and value of the resistance along the dipole antenna are proposed by Wu and King (Wu-King profile). This antenna is analyzed by using the finite-difference time-domain (FDTD) method. The electromagnetic field in the space surrounding the antenna is determined as a function of time, which can be used to calculate the current waveforms on the antenna, time-varying field in the far zone, and some important time domain parameters for describing the performance of the antenna. Graphical displays of these results are used to provide physical insight into the transient radiation processes of this antenna.