Analyzing the Electromagnetic Performances of Composite Materials With the FDTD Method

For analysis of the electromagnetic (EM) performances of composite materials, the periodic finite-difference time-domain (FDTD) algorithm, combined with the conformal technique, is adopted in this paper. Unlike the previous studies, which roughly model the composite structures as a homogeneous lossy medium or assume the induced fiber current as a filament current, this study models the composite material in microscopic scale on the basis of the actual configuration of it, which can represent the composite material accurately in detail. The power reflection coefficient and transmission coefficient for single- and double-panel fiber composite are presented. The effects of the geometry sizes (the fiber diameter R , the distance D between the two fibers in the same panel, the distance L between the two fibers in double panel), the incident wave polarization angle and the fiber electric conductivity are investigated. respectively. Numerical results illustrate composite materials have frequency-selective behaviors and multilayer composite materials have a good shielding effectiveness in the lower frequency range.