Abstract
We demonstrate a dual-band, polarization-insensitive, ultrathin and flexible metamaterial absorber (MA), based on high-order magnetic resonance. By exploiting a flexible polyimide substrate, the thickness of MA came to be 1/148 of the working wavelength. The absorption performance of the proposed structure was investigated for both planar and bending models. In the case of the planar model, a single peak was achieved at a frequency of 4.3 GHz, with an absorption of 98%. Furthermore, additional high-order absorption peaks were obtained by the bending structure on a cylindrical surface, while the fundamental peak with a high absorption was maintained well. Our work might be useful for the realization and the development of future devices, such as emitters, detectors, sensors, and energy converters.
Highlights
Metamaterial absorbers (MAs) have gained much attention because of their potential applications in sensing [1,2,3,4], imaging [5,6], and energy harvesting [7,8]
We simulated the absorption of the proposed MA for the transverse-electric (TE) normal incidence in the planar configuration
We demonstrated an ultrathin flexible MA in the GHz region
Summary
Metamaterial absorbers (MAs) have gained much attention because of their potential applications in sensing [1,2,3,4], imaging [5,6], and energy harvesting [7,8]. MAs are generally constructed with a three-layer structure, in which a periodicallyarranged metallic pattern is placed on a hard dielectric spacer, such as FR-4 [9,24] or vanadium oxide [18,25,26] These MAs have a great absorption performance, they are limited in practical applications, especially in the case of rough surfaces because of their inflexibility. Yang et al introduced a multi-band MA in which the electric ring resonator was rotated by 90◦ to form the symmetrical structure In this model, the electromagnetic absorption at two frequencies was caused mainly by the electric resonance [28].
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