Equivalent dipole-moment method for electromagnetic scattering by dielectric bodies

This paper presents an efficient method for the generation of MoM matrix based on the equivalent dipole-moment method for electromagnetic scattering by dielectric bodies. Based on the RWG basis function, the surface of the dielectric object is discretized into several triangular patches. Each RWG common edge element containing two triangular patches is regarded as a pair. The impedance matrix elements are calculated by conventional MoM when the pair of triangular patches of source point are not so far away from the field point, otherwise the electric and magnetic surface currents on the pair of triangular patches of source point can be equivalence as electric and magnetic dipole-moment, respectively, and all the rest impedance matrix elements are calculated by the equivalent dipole-moment method. Considering the boundary condition and PMCHW equation, the formula of impedance matrix elements is expressed. The equivalent dipole-moment method avoids the double integrates of the gradient of Green function and speeds up the forming of MoM matrix significantly. Numerical results show that it has less computation cost and high accuracy compared with MoM.