Researchers at the University of Washington just successfully tested Wi-Fi charging. A recent report in Wired detailed how the researchers equipped a variety of devices with sensors to take Wi-Fi signals from a router and turn them into DC power. The team wanted the system to integrate with pre-existing Wi-Fi infrastructure, so they gave an off-the-shelf Asus router a software update to make it work as both a wireless power source and as a conventional Wi-Fi router. Impressive numbers for sure, but they're hampered by the Federal Communications Commission's limit of one-watt power outputs on wireless routers
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