Abstract
A dual-band metamaterial absorber (MA) based on triangular resonators is designed and investigated in this paper. It is composed of a two-dimensional periodic metal-dielectric-metal sandwiches array on a dielectric substrate. The simulation results clearly show that this absorber has two absorption peaks at 14.9 and 18.9 GHz, respectively, and experiments are conducted to verify the proposed designs effectively. For each polarization, the dual-band absorber is insensitive to the incident angle (up to 60°) and the absorption peaks remain high for both transverse electric (TE) and transverse magnetic (TM) radiation. To study the physical mechanism of power loss, the current distribution at the dual absorption peaks is given. The MA proposed in this paper has potential applications in many scientific and martial fields.
Highlights
The dual-band absorber is insensitive to the incident angle and the absorption peaks remain high for both transverse electric (TE) and transverse magnetic (TM) radiation
The metamaterial absorber (MA) proposed in this paper has potential applications in many scientific and martial fields
Metamaterial absorbers (MAs) have attracted much attention since Landy et al.[1] demonstrated that the metamaterial could be designed as an EM absorber, and confirmed the almost complete absorption at microwave frequencies
Summary
Metamaterial absorbers (MAs) have attracted much attention since Landy et al.[1] demonstrated that the metamaterial could be designed as an EM absorber, and confirmed the almost complete absorption at microwave frequencies. The absorber is a planar-periodic structure, and the parameters of a unit cell are detailed in Fig. 1(b) (unit: mm). They were numerically optimized to provide the maximum absorption at 14.9 and 18.9 GHz, respectively. Both the background and the top layer of this absorber are made of copper metal, with the conductivity of σ = 5.8 × 107 S/m and a thickness of 0.017 mm. 16 and 17, four-fold rotational symmetric characteristic of the unit cell makes the structure provided in this paper insensitive to different polarized electromagnetic waves.
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