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A wireless charger for low capacity thin-film batteries is presented.Theproposed device consists of a nonradiative wireless resonant
energy link and a power management unit. Experimental data referring to a prototype operating in the ISM band centered at
434MHz are presented and discussed. In more detail, in order to facilitate the integration into wearable accessories (such as
handbags or suitcases), the prototype of the wireless energy link was implemented by exploiting a magnetic coupling between
two planar resonators fabricated by using a conductive fabric on a layer of leather. From experimental data, it is demonstrated that,
at 434MHz, the RF-to-RF power transfer efficiency of the link is approximately 69.3%. As for the performance of the system as a
whole, when an RF power of 7.5 dBmis provided at the input port, a total efficiency of about 29.7% is obtained. Finally, experiments
performed for calculating the charging time for a low capacity thin-film battery demonstrated that, for RF input power higher than
6 dBm, the time necessary for recharging the battery is lower than 50 minutes
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