Frequency extrapolation and model-based parameterization of antenna-platform radiation from CEM data

The numerical characterization of antenna radiation in the presence of a large, complex platform is usually very time consuming. We present a frequency extrapolation technique for the antenna radiation problem to obtain the radiated field over a wide band of frequencies from a limited set of frequency calculations. Given a CAD model of the platform, the induced current on the surface is first computed using a computational electromagnetics (CEM) simulator at a set of low frequencies. A time-of-arrival model is then applied to each current element and the superresolution algorithm, ESPRIT, is used to calculate the model coefficients. The frequency response of the current is extrapolated based on this model and the radiated field is obtained over a wide band of frequencies. The CEM simulator used is the multi-level fast multipole solver, FISC.