Carbon nanotubes for electromagnetic compatibility applications

The complex effective permittivity of different composite materials in a pulverized form is extracted using a probe-measurement setup. The studied materials consist of nanoparticles of alumina mixed with carbon nanotubes or nanoparticles of copper. Complex effective permittivity that is extracted based on microwave measurements is used to compute the effective a.c. conductivity for different packing densities. These experimental-based electrical parameters are used to predict the characteristics of an electromagnetic plane wave propagating trough a slab composed of the studied nanomaterials. Electromagnetic-wave characteristics such as phase velocity, skin depth, and power attenuation coefficient are presented to highlight the shielding performance of mixture of nanoparticles for electromagnetic compatibility (EMC) applications.