Accurate and efficient method for analysis of scattering from dielectric shell of rotation by least-squares algorithm

A novel and robust method for analysis of scattering from dielectric shells of rotation is presented. The calculation was done by using an E-fieldH-field integral equation plus the method of least-squares rather than using the combined field integral equation. The use of the E-fieldH-field integral equation defined just inside or outside the surfaces makes the source points and the field points slightly separated to avoid the singularity met by PMCHW or the Muller formulation. The least-squares method ensures the r.m.s error minimum on the boundary independent of the permittivity to overcome the inaccuracy existing in the PMCHW or Muller formulation, when permittivity is too small or too large. The calculated results show that this method possesses the advantages of good accuracy and convergence