Magnetically Actuated Reconfigurable Metamaterials as Conformal Electromagnetic Filters
Magnetically Actuated Reconfigurable Metamaterials as Conformal Electromagnetic Filters
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DOI：
10.1002/aisy.202200106
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发表时间：
2022-07
影响因子：
7.4
通讯作者：
Shuai Wu;Jack Eichenberger;Jize Dai;Yilong Chang;N. Ghalichechian;R. Zhao
中科院分区：
文献类型：
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作者：
Shuai Wu;Jack Eichenberger;Jize Dai;Yilong Chang;N. Ghalichechian;R. Zhao
具有定制特性的电磁（EM）超材料被开发用于航空航天和国防应用的波操纵，滤波和隐身。传统的电磁超材料在制造后由于材料性质和几何形状不变而表现出固定的行为，而可重构的电磁超材料可以通过电气/机械重新配置策略实现可调性能。由于电路设计复杂，传统的基于偏置电路的电气重构带来了挑战，而电机驱动的机械重构可能导致结构笨重，且适应性有限。在此，磁驱动结构可重构的电磁超材料具有增强的适应性/一致性，对不同的几何形状，显示快速，可逆和可编程的形状变形的优点，开发。磁驱动可以实现超材料在平面展开、平面折叠、弯曲展开和弯曲折叠状态之间的机械重构，从而实现共形和独立的3D形状变形。在局部，EM超材料折叠亚波长单位以获得可调谐特性，在结构重构时在全通和带阻行为之间切换。整体而言，该结构可以适应和变形不同的曲面。结构可重构的超材料还可以作为可定制亚波长单元的介质，通过合理设计附加的导电模式来实现各种滤波性能，如窄带、双带和宽带滤波行为，说明了所开发的结构可重构EM超材料的设计灵活性和应用通用性。
Electromagnetic (EM) metamaterials with tailored properties are developed for wave manipulation, filtering, and cloaking for aerospace and defense applications. While traditional EM metamaterials exhibit fixed behaviors due to unchangeable material properties and geometries after fabrication, reconfigurable EM metamaterials allow for tunable performance through electrical/mechanical reconfiguration strategies. Traditional biasing circuit‐based electrical reconfiguration poses challenges due to complex circuit design, while motor‐driven mechanical reconfiguration can lead to bulky and tethered structures with restricted adaptability. Herein, magnetically actuated structurally reconfigurable EM metamaterials with enhanced adaptability/conformability to different geometries, showing merits of fast, reversible, and programmable shape morphing, are developed. Magnetic actuation enables metamaterial's mechanical reconfiguration between flat deployed, flat folded, curved deployed, and curved folded states for both conformal and freestanding 3D shape morphing. Locally, the EM metamaterials fold subwavelength units for tunable properties, switching between all‐pass and band‐stop behaviors upon structural reconfiguration. Globally, the structure can conform and morph to different curved surfaces. The structurally reconfigurable metamaterial also serves as a medium for customizable subwavelength units by rationally designing attached conductive patterns for varied filtering performances such as narrow‐band, dual‐band, and wide‐band filtering behaviors, illustrating the design flexibility and application versatility of the developed structurally reconfigurable EM metamaterial.