Design and characterization of a wideband metamaterial absorber for microwave applications

Abstract

The metamaterial absorber’s new conception and simulation are presented in this paper. Two peaks of 97% and 99,8% are respectively shown by the absorption spectrum at the resonance frequencies 12,5 GHz and 14,5 GHz. Absorptivity is greater than 80% in the 6 GHz – 16 GHz frequency band and is sensitive to both polarization and incidence’s angles. Clearly this structure provides absorption more than 90% in the range frequency 11,9 GHz -15 GHz. The simulations’ results have revealed that the absorption characteristics can be controlled either by adding resistors to the metallic pattern or by changing its geometric or physical parameters. The proposed structure’s impedance is approximately equal to that of the free space at the resonance frequencies, which explains the perfect absorption’s obtention at these frequencies. A numerical comparison of our absorber with the four broadband perfect absorbers reported in the literature, leads to satisfactory Conclusion. This designed metamaterial absorber can be applied to antennas to improve their directivities.