Simplified perfect absorber structure

We investigated the dependence of reflectance and absorbance of a metamaterial structure (consisting of unit cells with two metallic parts, an electric ring resonator (ERR) at the front and a cut-wire bar at the back, separated by a dielectric layer) on gap ‘g’ of the structure at GHz frequencies. Our simulation results have shown that, by increasing the gap, the maximum absorbance and the minimum reflectance were obtained to be 94.42 and 0.74%, respectively, at 12.3 GHz. It was significant that the geometry of ERR was changed as an I-shape to observe a narrow-band peak of the perfect-absorber effect, whose absorbance was enhanced to be greater than 99.5% at 13.5 GHz by using a multilayer model for the simplified absorber structure.