Researchers develop new battery-free technology that draws power out of thin air. Researchers have developed a new technology to harvest ambient or 'waste' RF signals and use them to power small electronic devices.
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The key innovation is a nanoscale spin-rectifier that can convert extremely low-power RF signals of less than -20 dBm into a usable direct current voltage. This device overcomes a primary pain point of existing RF energy harvesting rectifiers, which struggle to operate efficiently at low ambient power levels.