Abstract
In this paper, a new metamaterial absorber (MA) is presented. The proposed absorber is a microwave structure constituted by a network of four split ring resonators (SRRs) of magnetic resonance and negative permeability (µ < 0); one resonator SRR central for triangular shape and three others resonators SRRs of the same square shape and the same dimensions. All resonators SRRs are printed on the upper surface of the FR4_Epoxy substrate (εr = 4.4; τgδ = 0.02), its dimensions are chosen to obtain the resonance in the X-band frequency. To eliminate the transmission, we add a copper conductive metal plate that will be etched on the upper face of the same substrate. The proposed MA is optimized for dimensions of (27.9 mm × 32 mm), its electromagnetic characteristics are studied for transverse electric (TE) polarization for different incidences and different inter-resonator spacing. The obtained results with the simulations performed by the high-frequency structure simulator (HFSS) show that our metamaterial absorber still has three peaks of different absorptions estimated at a maximum on the order of 98.76%. The main advantage of this study based on the proposed structure is that it is possible to control its absorption percentage for X-band radar applications.
New Metamaterial Absorber Based on Electromagnetic Coupling of Triangular SRR and Square SRRs for X-Band RADAR Applications