Fig. 1

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(a) Schematic diagram and photograph of the ink-jet printing paper-based metamaterials. (b) Simulated and measured absorptivity at different incident angles on a planar surface, and at 0° on a cylindrical surface (R11) [61]. Reproduced with permission from M. Momeni-Nasab et al., Int. J. Electron. Commun. 123, 153259 (2020). Copyright 2020 Elsevier. (This figure is subject to copyright protection and is not covered by a Creative Commons Commons license.)

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