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.