科研之友
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摘要
Metamaterial absorber (MA) with lossless spacing substrate is accompanied by total reflection which is a defect for the broadband design. In this paper, a theoretical transmission-line study of the total reflection is presented to introduce a 3D structural solution: a MA with polyurethane foam inserted by lateral resistive sheets and sandwiched between surface-resistive sheets and grounded aluminum foil. By virtue of the effective parallel plate capacitors formed between the neighboring square-resistive sheets which are perpendicular to the incident electric field, electromagnetic loss is generated from the charges accumulate and ohmic loss on them. As a result, the original total reflection (at f = 10 GHz) can be eliminated and a broadband absorption (from 2.88 to 18 GHz) with absorbance more than 90% is obtained for the proposed light weight (5.64 x 10(-5) g/mm(3)) 3D MA. The measurement result has a good agreement with simulation. This design opens up opportunities for the absorption bandwidth enhancement of MA and can be extended to infrared or optical region.
- 出版日期2016-6
- 单位深圳光启高等理工研究院; 电子科技大学
