a design for band enhanced dielectric absorber based on fractal-like structure

A dielectric metamaterial absorber has been proposed, which consists of fractal-like structure and conductive sheet. the fractal-like structure is made by the high permittivity dielectric and also is covered by the conductive sheet. absorptivity of such a dielectric metamaterial absorber is 99.1%, which can be found at 10.196 ghz; meanwhile, the absorber is polarization insensitive. to enhance the bandwidth of absorber, a novel absorber also is proposed, whose bandwidth is 0.566 ghz, which ranges from 9.752 to 10.318 ghz, and relative bandwidth is 5.64%. the maximum absorptivity can reach to 99.8%, and the proposed absorber also is polarization insensitive. in the meantime, the absorber shows excellent performance which is incident angle insensitive; when the incident angle is increased to 70°, the absorptivity is larger than 75%.