US Researchers Invent First Battery-Free Cellphone
Researchers at the University of Washington (UW) have invented a phone that harvests the few microwatts of power it requires from either ambient radio signals or light and requires no batteries. Detailed in a paper published in the Proceedings of the Association for Computing Machinery on Interactive, Mobile, Wearable and Ubiquitous Technologies, the battery-free cellphone marks a major leap forward in moving beyond chargers, cords and dying phones, Xinhua news agency reported.
The team of computer scientists and electrical engineers eliminated a power-hungry step in cellular transmissions, namely converting analog signals that convey sound into digital data that a phone can understand, which consumes so much energy that it’s been impossible to design a phone that can rely on ambient power sources.
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