NUMERICAL SCATTERING ANALYSIS FOR 2-DIMENSIONAL DENSE RANDOM-MEDIA - CHARACTERIZATION OF EFFECTIVE PERMITTIVITY

In this paper, a new numerical method for determining effective permit tivity of dense random media in two dimensions is presented, The core of the method is to compare the average scattered field of a random co llection of scatterers confined within an imaginary boundary with the scattered field from a homogeneous dielectric of the same shape as the imaginary boundary, The two-dimensional (2-D) problem is aggressively studied here to provide insight into the dependence of the method's c onvergence on particle size, boundary shape, and boundary dimension. A novel inverse scattering method is introduced based on the method of moments (MoM), which greatly reduces the computation time and increase s the flexibility of the procedure to analyze a variety of geometries. Results from this 2-D method may be used directly to compare with the oretical methods for determining effective permittivity such as the Po lder-Van Santen mixing formula or field techniques such as the quasi-c rystalline approximation.