NUMERICAL-ANALYSIS OF 3-D SCATTERING PROBLEMS USING THE YASUURA METHOD

The Yasuura method is effective for calculating scattering problems by bodies of revolution. However dealing with 3-D scattering problems, w e need to solve bigger size dense matrix equations. One of the methods to solve 3-D scattering is to use multipole expansion which accelerat e the convergence rate of solutions on the Yasuura method. We introduc e arrays of multipoles and obtain rapidly converging solutions. Theref ore we can calculate scattering properties over a relatively wide freq uency range and clarify scattering properties such as frequency depend ence, shape dependence, and polarization dependence of 3-D scattering from perfectly conducting scatterer. In these numerical results, we ke ep at least 2 significant figures.