A dual-band conformal metamaterial absorber for curved surface

摘要

In this paper, an ultra-thin dual-band conformal metamaterial absorber has been presented for curved surface applications. The proposed structure consists of a periodic array of two concentric rings printed on a grounded dielectric substrate. The numerical simulation shows that two discrete reflection dips occur at 7.22 GHz (C-band) and 14.55 GHz (Ku-band) with reflectivities of -17.55 dB and -12.80 dB, respectively. Furthermore, the proposed structure is polarization-insensitive and wide angularly stable (upto 45°) for both TE and TM polarizations. Unlike conventional planar absorbers, the design is made of ultra-thin substrate (λ0/138 for lower frequency) and therefore can be used as absorber coating for planar as well as curved surfaces. Finally, a prototype has been fabricated and measured in anechoic chamber, which shows good agreement between the experimental and simulated responses.