Multi-layer design of SWCNTs composites for X-Band

The purpose of the present work is the implementation of a four layer structure composed of mixtures with single-walled carbon nanotubes at different weight percentages (1, 3, 15, 20%) for minimizing the Reflection Coefficient of incident waves. The presence of a supporting PEC layer is also considered. A combination of epoxy resin and polyurethane as composite matrix is employed. The structure is excited by a plane wave incident from various elevation angles through X-Band. Comparison with reference results shows satisfactory agreement. A formal optimization technique is adopted to minimize Reflection Coefficient with respect to the optimum thickness of each layer. As shown, minimum values of Reflection Coefficient found in literature for PEC substrates, can also be achieved without the use of PEC substrates and for thinner substrates. Hence, lighter structures for EMC applications can be obtained.