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. 2020 Sep 14;378(2182):20190609. doi: 10.1098/rsta.2019.0609

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© 2020 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 4. — (a) Quadruple-split-ring metasurface and the experimental results [76]. (b) Schematic based on the enhanced resonant metasurface and its transmission and phase characteristics in experiments [77]. (Online version in colour.)