A Design for Band Enhanced Dielectric Absorber Based on Fractal-Like Structure
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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%.
KeywordsDielectric metamaterial absorber Bandwidth enhanced Polarization insensitive Angle insensitive
Funding of Jiangsu Innovation Program for Graduate Education (KYLX16_0368); National Natural Science Foundation of China (Grant No.61671238); Chinese Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 1501016A); Project Funded by China Postdoctoral Science Foundation (Grant No. 2015M5817100); and the special grade of the financial support from the China Postdoctoral Science Foundation (Grant No. 2016T100455).
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