Use of frequency-derivative information in two-dimensional electromagnetic scattering problems

The use of frequency-derivation information incorporated with model-based parameter estimation (MBPE) to predict the scattering from conducting and dielectric two-dimensional tragets over a frequency band is summarised. Instead of computing a method of moment solution using a point-by-point approach, a rational function model is used to approximate the current as a function of frequency. The model coefficients are computed using frequency-derivative information at one frequency within the band to improve efficiency of conventional moment method approaches. Results show that the model based approach gives excellent results over a limited frequency band, and is much more efficient than the converntional point-by-point approach.