Ultra-Broadband and Large Angle Metamaterial Absorber Based on 3D Anisotropic Resistive Structure and Magnetic Material

Ultra-broadband and large angle metamaterial absorber (MMA) based on three dimensional anisotropic resistive film structure and magnetic material was proposed. The designed MMA consists of four layers, the top layer is resistive film structure, the second layer is tri-dimensional cross-resistive film metamaterial structure, the third layer is conditional magnetic material, and the bottom is metal ground plane. Owing to the three-dimensional anisotropic metamaterial structure, the designed absorber can realize ultra-broadband and large angle absorption. Simulation result shows that the absorption rate is more than 90% in the frequency range of 1.3–30[Formula: see text]GHz with TM polarized wave with incident angle 82 ∘ , and simultaneous realizing the large angle absorption about 70% as the incident angle changes from 60 ∘ to 87 ∘ . In order to analyze the mechanism of the ultra-broadband and larger angle absorption, we also simulated the results without the top layer or the magnetic material absorbers to search the cause of ultra-broadband and larger angle absorption. In succession, surface current distributions and power loss density on different structural layers of absorber at different frequencies are analyzed. The absorption spectrums under different polarization angles also have the same absorption effect due to the four-fold rotationally symmetric unit structure. We believe that the absorber will may have many potential applications in some field.