Efficient reflection/transmission coefficient by two-layered dielectric slab for accurate propagation analysis

In this paper, we propose efficient reflection and transmission coefficients from two-layered dielectric slab for realizing accurate ray-launching propagation analysis, by approximately including multiple reflections effect inside the dielectric slab. In order to precisely execute the ray-launching analysis through the two-layered slab, which is a simplified model of insulating glass window utilized on side wall of modern building, an efficient high frequency approximation is introduced to bundle or collect the multiple reflected rays inside the two-layered slab into the primary ray component. We here call it “collective ray”. By utilizing the derived new reflection/transmission coefficients, one can easily include the multiple reflections effect inside the slab without increase of computational time.