The effect of complex loads on the scattering from a microstrip dipole

The scattering of a plane wave by a microstrip dipole antenna has been analyzed by a frequency-domain MoM method with rooftop basis functions and Galerkin's procedure. The time-domain responses of the scattered field are obtained via the inverse FFT and the poles and residues of the time-domain response are extracted by the generalized pencil-of-function (GPOF) method. The results show that the various loads have a great effect on the transient scattered fields, but not much effect on the resonant frequencies. This characteristic is beneficial to identify a scatterer by its complex natural resonance.