Dielectric Substrates Anisotropy Effects on the Characteristics of Microstrip Structures

Abstract

In this paper, we present an extension of the 3-D FDTD method based on D, E, B and H fields to handle arbitrary anisotropic media characterized by both a permittivity and a permeability tensors. This analysis was not possible for many FDTD simulators due to the lack of convenient absorbing boundary conditions (ABCs). Using the FDTD Method with Generalized Material-independent perfectly matched-Layer (GMIPLM) ABCs, based on the unsplit formulation, the behavior of the characteristics of microstrip structures printed on general anisotropic dielectric substrates is studied as a function of the optical axis rotation angle of this substrate.