Compact-sized and broadband carpet cloak and free-space cloak
Hui Feng Ma, Wei Xiang Jiang, Xin Mi Yang, Xiao Yang Zhou, and Tie Jun, Cui

TL;DR
This paper presents the first experimental demonstration of broadband, low-loss free-space and compact carpet cloaks using non-resonant metamaterials, advancing practical invisibility applications in microwave frequencies.
Contribution
It introduces a novel design for broadband, low-loss cloaks that are more compact and feasible for real-world use, based on recent theoretical developments.
Findings
Successful experimental realization of broadband free-space cloak
Demonstration of a compact-sized carpet cloak with good invisibility
Cloaks operate effectively in microwave frequencies with low loss
Abstract
Recently, invisible cloaks have attracted much attention due to their exciting property of invisibility, which are based on a solid theory of transformation optics and quasi-conformal mapping. Two kinds of cloaks have been proposed: free-space cloaks, which can render objects in free space invisible to incident radiation, and carpet cloaks (or ground cloaks), which can hide objects under the conducting ground. The first free-space and carpet cloaks were realized in the microwave frequencies using metamaterials. The free-space cloak was composed of resonant metamaterials, and hence had restriction of narrow bandwidth and high loss; the carpet cloak was made of non-resonant metamaterials, which have broad bandwidth and low loss. However, the carpet cloak has a severe restriction of large size compared to the cloaked object. The above restrictions become the bottlenecks to the real…
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