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- Energy evaporation: the new concept of indoor systems for WPT and EH embedded into the floorPublication . Mariotti, Chiara; Gonçalves, Ricardo; Roselli, Luca; Carvalho, Nuno B.; Pinho, PedroThis work introduces a novel idea for wireless energy transfer, proposing for the first time the unit-cell of an indoor localization and RF harvesting system embedded into the floor. The unit-cell is composed by a 5.8 GHz patch antenna surrounded by a 13.56 MHz coil. The coil locates a device and activate the patch which, connected to a power grid, radiates to wirelessly charge the localized device. The HF and RF circuits co-existence and functionality are demonstrated in this paper, the novelty of which is also in the adoption of low cost and most of all ecofriendly materials, such as wood and cork, as substrates for electronics.