Fig. 2
From: Harnessing metamaterials for efficient wireless power transfer for implantable medical devices
Representation of several recent state-of-the-art literature related to WPT systems with metamaterial. a (Shaw and Mitra 2019), (b) reprinted with permission, copyright IEEE (Li et al. 2018), (c) reprinted with permission, copyright IEEE (Wang et al. 2021), (d) reprinted with permission, copyright IEEE (Chen et al. 2019), (e) Adapted from (Agrawal et al. 2017), (f) reprinted with permission, copyright IEEE (Alshhawy et al. 2022), and (g) Adapted from (Pokharel et al. 2021)