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Prototype and measurement setup of implantable WPT system: (a) fabricated Tx patch antenna; (b) fabricated RX implantable loop antenna; (c) metasurface design of 4 × 4 unit cell array; (d) testing RX element inside skin-mimicking gel; (e) testing RX element inside minced pork; (f) testing RX element inside pork slab [175].
