Multifunctional metamaterial absorber based on honeycomb filled with epoxy-carbon nanotube nanocomposite and split ring resonator

A proof of concept for a material combining thermal conductivity, high stiffness, and high electromagnetic absorption over a wide range of frequencies is presented. A metallic honeycomb acting like a waveguide is filled with a lossy conductive nanocomposite medium. In order to absorb below the cutoff while preserving the same compacity, a single split ring resonator is inserted in each honeycomb cell to generate simultaneously negative values of the real parts of effective parameters ε^´ and μ^´, enabling left handed propagation and subsequent absorption. Experimental measurements demonstrate the expected improved absorption below the cutoff, as predicted by simulations.