Fig. 2

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The number of patents published (granted) related to biomedical (a) antennas (blue line), (b) metamaterials (orange line), and (c) metasurfaces (gray line). The inset figure highlights only the metamaterial and metasurface-related patents, highlighting a growing number, especially in very recent years. Still, the number of antenna-related patents for biomedical applications surpasses 800 granted patents per year. The data was retrieved from the Google Patents repository, while the query included the word found only in the abstract of the patents [6].

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