GREENS IDENTITY CHECKS AND BOUNDARY-ELEMENT SOLUTION OF NEW COMBINED FIELD INTEGRAL-EQUATIONS FOR ELECTROMAGNETIC SCATTERING

A quadratic isoparametric boundary element formulation has been used t o solve numerically a set of new combined field integral equations (NC FIEs) for electromagnetic scattering in which the unknowns are the ele ctric and magnetic fields themselves rather than related potentials. T reatment of weakly and strongly singular integrals appearing in the eq uations is based on subtraction and regularization, including its appl ication to Cauchy principal values. Results for an appropriate related Green's identity are used to indicate efficiency and accuracy. Corres ponding solutions obtained from the full equations for the differentia l scattering cross-section distribution with respect to scattering ang les are compared with exact results for a dielectric sphere and provid e good agreement.