Bandwidth extension of metamaterials with low reflectivity

Following introduction of a figure of merit to quantify the thickness-normalized bandwidth of metamaterials for reflectivity reduction from metallic surfaces, possible methods are explored to design broadband metamaterials with low reflectivity. It is presented that the static permeability of substrate, the frequency-dispersion of permeability and permittivity of substrate, and the metallic resonant patterns all determine the figure of merit, and in turn the bandwidth of broadband metamaterials. Both numerical and experimental examples are included to validate the designs.