Implementation of the Z matrix interpolation in the method of moments for analysis of transient antennas excited by UWB pulses

In this paper, we implement the Z matrix interpolation technique for ultra-wideband (UWB) transient analysis of antennas excited by short pulses. This kind of analysis usually requires a much larger frequency range in comparison with analysis of wideband time-harmonic antennas. Due to stronger variation of currents at low frequencies down to DC, generally more frequency points are needed in the frequency range. In this work, we attempt to find a general rule of thumb for determining the optimal selection of frequencies for analysis of antennas excited by UWB pulses, using MoM with the Z matrix interpolation technique.