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基于阻抗匹配条件的树枝状超材料吸收器
  • 期刊名称：物理学报 59 (2010) 6078
  • 时间：0
  • 分类：O631[理学—高分子化学;理学—化学]
  • 作者机构：[1]西北工业大学应用物理系,西安710129
  • 相关基金：国家自然科学基金（批准号：50632030 50872113 50936002）资助的课题~~
  • 相关项目：左手材料的设计、制备和物理效应研究
关键词： 树枝状结构, 阻抗匹配, 吸收, dendritic structure, impedance matching, absorption
中文摘要：

基于树枝状金属结构单元的电磁谐振特性,设计了一种双面大小树枝状结构的超材料吸收器,该结构分别是正面二级树枝及正对的背面三级树枝.通过仿真模拟设计了不同的阻抗匹配方式,调节相应的结构参数,找到了阻抗匹配对吸收特性的影响.在最佳的阻抗匹配条件下,得到最大吸收率.实验测量表明,阻抗匹配条件下双面大小树枝模型可以实现90.01%吸收率.增加样品层数可以有效的增加吸收率,3层样品就可以达到99%以上的吸收率,实现工程意义的完美吸收.

英文摘要：

Based on the electromagnetic resonant characteristic of the metallic dendritic cells,we present a metamaterial absorber （MA） composed of periodic array of double dendritic cells. The unit cell of the absorber is composed of two metallic elements on the substrate,a two-level dendritic cell and a three-level dendritic cell are located on each side separately. Designing different impedance matching conditions,the effect of impedance matching on the absorptivity is found. The experimental results show that a maximum absorptivity of 90% can only occur when the MA layer is impedance-matched to free space. At the same time,increasing the number of MA layers can effectively enhance the absorptivity. For 3 layers,the absorptivity above 99% can be obtained,that is to say,a perfect MA is realized in the engineering sense.

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Material parameter equation for rotating elliptical spherical cloaks
具有宽频特性带通频率选择表面的设计
A metamaterial absorber with direction-selective and polarisation-insensitive properties