摘要
基于干涉理论,利用低介电材料全介质谐振表面(All-dielectric resonance surface,ADRS)设计并制备了一种新型二元结构超材料吸波体(Binary-structural metamaterial absorber,BMA)。优化后的BMA分别在13. 332 GHz、16. 722 GHz和17. 34 GHz处有强吸收。通过阻抗分析、能量损耗分布及场分析的方法解释了BMA的谐振与吸波机理,并研究了ADRS结构参数对吸波性能的影响。分析表明,BMA的三频谐振来源于ADRS的电谐振响应; ADRS的结构决定谐振峰处磁场分布,进而影响吸波性能。仿真结果与实测结果吻合较好。本工作提出的采用低介电材料ADRS代替传统金属谐振表面及难以制备的高介电常数ADRS,极大地简化了超材料吸波体的设计。
In this paper,based on the interference theory,the novel binary-structural metamaterial absorber( BMA) using single low-permittivity all-dielectric resonance surface( ADRS) was designed and fabricated. The optimized BMA exhibited three strong absorption peaks at 13. 332 GHz,16. 722 GHz,and 17. 34 GHz,respectively. The resonance and absorption mechanisms of the BMA were explained via relative impedance analysis,distributions of power loss density and field analysis. Meanwhile,the influences of absorption properties on structure parameters of ADRS were studied. It can be discerned that the three resonance peaks can be owed to electric-resonance of ADRS,and the magnetic-field distributions at resonance frequencies were determined by the ADRS structure. The simulated results were well agreed with the measured one. The current design that employed the low-permittivity ADRS instead of conventional metal resonance surface or high-permittivity ADRS,dramatically simplified metamaterial designs.
引文
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