Design of a wideband metamaterial absorber based on double-layer resistive film
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Abstract:
A wideband, polarization-insensitive and wide-angle metamaterial absorber based on double-layer resistive film is proposed in this paper. A unit cell of the absorber consists of a ring resistive film, a substrate, a ring resistive film, a substrate layer and a metal backboard in turn. The simulations and analysis of electromagnetic absorbing properties of this absorber are performed by the finite-difference time-domain method. The simulated reflection and absorption indicate that the absorption of incoming electromagnetic waves by this absorber is higher than 90% in a frequency range of 11.5 GHz to 20.3 GHz. The simulated absorptions under different polarization conditions and incident angles show that this absorber is polarization-insensitive and of a wide incident angle. The simulated influence of structure parameters on the absorption indicates that the absorption of this absorber originates mainly from the absorbing mechanism of circuit resonance. The operation frequency range and band width can be adjusted by the design of the substrate thickness, the resistance and the width of the resistive film so as to achieve the strongest absorption with an ultra-wide band.
