Abstract
A cross-band dual-layer metamaterial absorber with properties of broad bandwidth is presented in this paper. Different from the previous methods to broaden the absorption width, this letter proposes a novel design of the structure of dielectric substrates with sine-curved shape surfaces. The proposed structure consists of two layers of dielectric substrate which exhibits as periodic sine-curved shape. Several closed ring resonators (CRRs) wrap on the top curved-surfaces of both the layers of the dielectric substrate in a unit cell. This approach for expanding absorption bandwidth is confirmed by numerical simulations in which the multiband absorbers can couple to a wideband absorber. With the parametric optimization method, the bandwidth-enhanced absorptions occur across C and X band. Comparing the absorption performances of the proposed structure with planar substrate situation by simulated results, we find the bandwidth of the sine-curved-surface absorber is widened. The full width at half maxima (FWHM) bandwidth is greater than 4GHz and the absorption peak is over 95% in the whole frequency range. This specific periodic curved surface structure provides a new idea for widening bandwidth of metamaterial absorbers.
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