Creating Multiband and Broadband Metamaterial Absorber by Multiporous Square Layer Structure

Since the metamaterial perfect absorber (MPA) is composed of electromagnetic resonance structures, the main operational mechanism of the MPA is electromagnetic resonance. In this work, we use Finite Integration Technique (FIT)-based simulation to study a metamaterial absorber based on multi-layer resonance structures then the result is verified by experiment. We find that increasing the number of layers gives rise to an increase in the absorption energy and induces a large number of the absorption peak up to 9, thus forming a broad and multiband metamaterial in the frequency range from 5 to 8.9 GHz. In addition, the tunability of structural parameters in the four-layer structure allows optimizing the absorption peakswith an intensity of over 90%, which is in good agreement with the experimental result. These findings could play an important role in the design of radar shield or military devices.