The application of genetic algorithm on the frequency extrapolation method using current density from the MOM

The multiple trace current density, from the result of MOM (Method of Moment), model varying with the frequency was created, ESPRIT method is used to evaluate the parameters of the model based the current densities at several frequency points, it is easy to obtain the more wide frequencies current density and it saves lots of time to calculate the wide band scatting; it is indicated that the extrapolation results agree with the results using the strict MOM when the extrapolation scope less than six, but the results become disperse when the extrapolation scope enlarge more, and extrapolation scope is not stable. The optical function of genetic algorithm was found by calculating the sample point data at more wide frequencies, at which the extrapolation data agree with that from MOM, and the model parameters was revised. The monostatic and biostatic RCS were discussed between the extrapolation result and that from MOM of the paraboloid, when electromagnetic wave incidence inclined; it is indicated that the precision and band of frequency extrapolation can be enlarged more.