基于3D打印技术的任意曲面共形超表面隐身衣

3D-printed conformal metasurface invisibility cloak with arbitrary boundary

超表面因其具有强大的电磁操控能力以及损耗小、剖面低和易加工等优势,在电磁工程领域受到了研究人员的广泛关注。然而,由于受加工技术的限制,目前所报道的超表面地毯隐身衣大多由二维平面结构拼接而成,研制能与任意目标曲面共形的地毯隐身衣仍然是一个挑战。为此,本文基于超表面和3D打印技术设计并验证了一款具有任意曲面的共形超表面隐身衣,打破了二维平面结构的限制,实现了对地面目标的雷达隐身。仿真和测试结果均表明该隐身衣可以在13 GHz处表现出良好的隐身性能,并且在一定的角度入射下保持性能的稳定性。本文所提出的三维共形超表面隐身衣设计方法不仅在电磁隐身领域有广阔的应用前景,也为设计其他共形电磁器件开启了新途径。

Metasurfaces have intrigued great interest among researchers in electromagnetic(EM)engineering field due to the powerful ability of EM manipulation and advantages of low loss,low profile and ease-fabrication.Nevertheless,due to the limitation of the fabrication technology,currently,most of the reported metasurface carpet invisibility cloaks are composed of two-dimensional planar structures.It is still a challenge to achieve conformal metasurface carpet invisibility cloak for an object with arbitrary boundary.Therefore,we designed and demonstrated a conformal metasurface carpet invisibility cloak with arbitrary boundary based on metasurfaces and 3D-printed technology,which breaks the limitation of two-dimensional planar structures and achieves radar stealth for ground object.Both simulated and measured results show that such conformal metasurface invisibility cloak exhibits an excellent stealth performance and sustains performance stability at certain incident angles.Notably,the proposed 3D conformal metasurface invisibility cloak not only promises a wide application prospect in the EM stealth field,but also opens a new way to design EM devices.