A general three dimensional formulation of high frequency solution for the scattering field of a dielectric body, which is illuminated by a transverse electric polarized plane wave, is presented. Based on the postulated equivalent currents, scattering far field components are derived. Effects of complex permittivity of material and the multiple bouncing effect caused by the finiteness of scattering body are included in a collective reflection coefficient. Under monostatic conditions, obtained formulae precisely agree with the ones derived from conventional physical optics in the case of a PEC surface. Differences between the two methods are observed in bistatic RCS estimation. Effects of finiteness of scattering body and of polarization on RCS are investigated.
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