COMPARISON BETWEEN VARIOUS FORMULATIONS OF THE EXTENDED BOUNDARY-CONDITION METHOD

The accuracy of various formulations of the extended boundary conditio n method (EBCM) for solving the scattering problem of a cone-sphere pa rticle is investigated. We compare the standard EBCM, the multiple mul tipole EBCM, the lowest-order multipole EBCM and the EBCM with sub-dom ain bases. For this purpose we choose the residual of the total electr ic field on spherical surfaces with shifted origins as error criterion . A hybrid method consisting of a combination of sub-boundary bases an d global-boundary bases for the surface current density representation is also discussed. (C) 1997 Elsevier Science B.V.