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Researchers develop new battery-free technology that draws power out of thin air
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...
This device overcomes a primary pain point of existing RF energy harvesting rectifiers, which struggle to operate efficiently at low ambient power levels. National University of Singapore Professor Yang Hyunsoo, who led the project, explained that traditional gigahertz Schottky diode rectifiers have remained stagnant for decades due to fundamental thermodynamic restrictions at low power levels. In a similar study, Korean researchers optimized backscatter technology, allowing devices to reflect modulated wireless signals to transmit data to boost battery-free operation, resulting in a 40 percent improvement in energy efficiency.
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