An ultrathin wide-band planar metamaterial absorber based on fractal frequency selective surface and resistive film

We propose an ultrathin wide-band metamaterial absorber (MA) based on Minkowski (MIK) fractal frequency selective surface (FSS) and resistive films. This absorber consists of a periodic arrangement of dielectric substrate sandwiched with MIK fractal loop structure electric resonator and resistive film. The finite element method (FEM) is used to simulate and analyze the absorption of MA. Compared with the MA backed copper film, the designed MA backed resistive film exhibits an absorption of 90% in a frequency region of 2 GHz-20 GHz. The power loss density distribution of MA is further illustrated to explain the mechanism of proposed MA. Simulated absorptions in different cases of incidence indicate that this absorber is polarization-insensitive and of wide-angle. Finally, the further simulated results indicate that surface resistance of resistive film and dielectric constant of substrate can affect the absorbing property of the MA. This absorber may be used in many military fields.