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Multifunctional metamaterials under development in our group are based on a hierarchical combination, from nano to macroscale, of conductive inclusions and polymer matrices. The paper illustrates this hybrid approach for a metallic honeycomb filled with a carbon nanotube-reinforced polymer foam. The waveguide characteristic of the honeycomb combined with the electromagnetic properties of the foam lead to large power absorption above the cut-off frequency of the waveguide, situated in the GHz range. Below cut-off, electromagnetic shielding is also offered by total reflection at input interface of the hybrid, preventing the signal transmission.

metamaterials; nanotechnology; carbon nanotubes; microwave absorbers; EM shielding