A multi-band closed-cell metamaterial absorber based on a low-permittivity all-dielectric structure

摘要

A closed-cell metamaterial absorber (CCMA) made of a low-permittivity dielectric is proposed and investigated in this paper. It realizes five absorption peaks below -10 dB in the range of 6-18 GHz, and the strongest absorption can reach near -40 dB. By investigating the distribution of electromagnetic fields, it is found that multi-resonance is caused by the embedding of closed cells. Interestingly, it is possible that part of the absorption peaks could be moved individually by different parameters of the closed-cell arrays. Similarities between the results of experiment and simulation confirm the practical feasibility of the CCMA.