Design of an ultra-thin bandwidth-optimized metamaterial absorber for EMC applications

We present a simple design and simulation of an ultra-thin metamaterial (MTM) absorber that operates around 11.5 GHz. The advantages of the absorber are the small overall thickness (~λ/70), the absence of a metallic back plate and its wide-angle good performance. More than two absorbing layers can be stacked to achieve nearly perfect absorbance. Moreover, by exploiting the scalability property of MTMs, a 2×2 array of unit cells is designed to form an extended unit cell that exhibits an enhanced bandwidth performance with FWHM of 6.57%. The designed microwave absorber can be utilized for EMC applications.