ShaZam: Charge-FreeWearable Devices via Intra-Body Power Transfer from Everyday Objects
summary
ShaZam implements capacitive intra-body RF power transfer: a compact transmitter mounted on everyday objects and a batteryless wrist receiver with a charge pump and battery manager, using HFSS-guided electrode geometry and an impedance-muned network. Experiments on 10 people across keyboard, laptop, steering wheel scenarios deliver about 0.5–1 mW DC to a storage capacitor; laptop leakage reduces power, low humidity cuts delivered power roughly 50%, but charging remains feasible for ultra-low-power wearables.
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