Experimental Realization of a One‐Directional Broadband Transmissive Cloak in Microwaves

作者：Ruichen Li, Min Huang, Yijun Zou, Bin Zheng, Caofei Luo, Lian Shen, Hui Jin, Hongsheng Chen · 发表于：Laser & Photonics Review · 年份：2024 · DOI：10.1002/lpor.202400611 · 被引用次数：12 · 研究领域：Antenna Design and Analysis、Metamaterials and Metasurfaces Applications、Advanced Antenna and Metasurface Technologies

Abstract Hiding an isolated object in free space using a transmissive invisibility cloak has become a significant research area, propelled by advancements in metamaterials and transformation optics over the past decade. Despite the availability of various simplified methods for implementing transmissive cloaks, issues such as impedance mismatches and narrow working bandwidths often arise, posing challenges. Achieving a broadband transmissive cloak in free space has proven to be particularly arduous. This study presents a near‐perfect one‐directional broadband transmissive cloak constructed from multilayer metasurfaces of arbitrary shapes, showcasing superior performance across a broadband frequency range. The phase distribution of the metasurfaces and the efficacy of the transmissive cloak are assessed using the generalized Snell's law. An experimental near‐perfect broadband transmissive cloak is successfully demonstrated to operate within the frequency range of 8.5 to 11.2 GHz. This study contributes to reducing the density and mass of cloaks, thereby facilitating the expansion of cloaking capabilities in various directions and across different frequency bands.