Multi-band metamaterial absorber based on the arrangement of donut-type resonators

We propose multi-band metamaterial absorbers at microwave frequencies. The design, the analysis, the fabrication, and the measurement of the absorbers working in multiple bands are presented. The numerical simulations and the experiments in the microwave anechoic chamber were performed. The metamaterial absorbers consist of an delicate arrangement of donut-shape resonators with different sizes and a metallic background plane, separated by a dielectric. The near-perfect absorptions of dual, triple and quad peaks are persistent with polarization independence, and the effect of angle of incidence for both TE and TM modes was also elucidated. It was also found that the multiple-reflection theory was not suitable for explaining the absorption mechanism of our investigated structures. The results of this study are promising for the practical applications. (C) 2013 Optical Society of AmericaThis work was supported by the ICT Standardization program of KCC, by the Korean Ministry of Science, ICT and Future Planning though the KCA, the Priority Research Center Program through the National Research Foundation (NRF) funded by the Korean Ministry of Education Science and Technology (MEST) (2011-0031392), MEST and PAL, Korea, and the NRF funded by the MEST (Nos. 2010-0029418, 2010-0025306 and 2012K1A2B2A07033424)