Wideband scattering of microstrip patches using natural modes

Model-based parameter estimation is proposed as a numerically efficient method for the wideband or transient characterization of three-dimensional antennas or scatterers. The approach employs existing frequency domain method of moment (MoM) codes to compute the necessary complex natural resonances and modes used to construct an analytic wideband model of the current response. The mode amplitudes are determined by matching reference cases thus avoiding the complicated residue evaluation of the conventional singularity expansion model. As an example, the radar cross section (RCS) of a microstrip patch is modeled over the 1-18 GHz band.<
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