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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Broadband metamaterial absorber based on a multi-layer structure
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Broadband metamaterial absorber based on a multi-layer structure

机译：基于多层结构的宽带超材料吸收器

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摘要

In this paper, a broadband metamaterial absorber (MA) based on a multi-layer structure is presented. The advantages of this MA are the small periodic unit size, they are thin, have excellent polarization characteristics and are adaptive for wide angles of oblique incident electromagnetic waves. The unit cell of the broadband MA is composed of three dual-band sub-cells; each presents two resonant frequencies so as to form a wide absorptive spectrum when stacked. The sandwiched dual-band sub-cell is composed of one metallic annular patch and one metallic circular patch each etched on a lossy substrate. The radii of the metallic patches forming each sub-cell are different so as to appear to have different resonant frequencies. In the design of the unit cell there are metallic circular patches and an air layer at the bottom of each sub-cell to form magnetic coupling and avoid coupling between sub-cells. The broadband MA presents good absorptivity above 80% between 8.8 and 10.8 GHz, with a full width at half maximum (FWHM) absorption bandwidth of 2.3 GHz and a relative FWHM absorption bandwidth of 23%.
机译：本文提出了一种基于多层结构的宽带超材料吸收器（MA）。该MA的优点是周期单元尺寸小，它们薄，具有优异的极化特性并且适合于倾斜入射电磁波的大角度。宽带MA的单位小区由三个双频子小区组成。每个都有两个共振频率，以便在堆叠时形成宽吸收光谱。夹层双带子电池由一个金属环形贴片和一个金属圆形贴片组成，每个都蚀刻在有损基板上。形成每个子电池的金属贴片的半径是不同的，从而看起来具有不同的谐振频率。在单元电池的设计中，每个子电池的底部都有金属圆形补丁和空气层，以形成磁耦合并避免子电池之间的耦合。宽带MA在8.8至10.8 GHz之间具有80％以上的良好吸收率，半峰全宽（FWHM）吸收带宽为2.3 GHz，相对FWHM吸收带宽为23％。

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