Effective Permittivity of 3-D Periodic Composites With Regular and Irregular Inclusions

This paper explores the effective temporal surface-illuminated properties of two-component composites consisting of inclusions of regularly-and irregularly-shaped crystals in a matrix. Time-domain electromagnetic modeling using the finite integration technique is used to calculate scattering (S-) parameters, and from these, the effective relative permittivities are calculated. It is shown that the orientation of inclusions with high permittivity contrast affects the effective electrical permittivity of a composite mixture. For both low and high contrast inclusions, fields localize at edges and corners of the irregular inclusion in a manner not dependent on boundary conditions used in simulation.