Electromagnetic properties and optimizations of the laminated composites

The electromagnetic properties of fiber-reinforced laminated composite are studied and optimized here, with the fibers in the structure are organized in a periodic way. The laminate is consist of multiple layers with the fibers in each layer periodically arranged and bind together by the matrix which can be epoxy or ceramics etc. A number of fibers are embedded into one periodic cell and bind together to form a fiber bundle for wave absorption enhancement. The electromagnetic wave scattering properties of this composite are studied in detail with different structural and electromagnetic parameters. The constrained optimization by linear approximations is applied for optimization the reflection and transmission properties of the structure. The finite-difference time-domain method is applied in this article for the numerical investigations. Short Gaussian pulse is used as the source for the time domain simulation, and a Fourier transformation is then applied to get the field distribution and the reflection/transmission coefficients in a wide frequency band. Various numerical results are presented with detailed discussions.