WiFi signal charging

Originally thought that Qi's standard wireless charging technology has been amazing, but after careful consideration, he actually did not really bid farewell to the charger. Because, you have to put the phone in a designated place to be able to wirelessly charge, there are adapters and other devices below. Not long ago, U.S. undergraduates invented a WiFi signal charging technology that allows your smartphone to connect to a WiFi network while charging the phone. Amazing!

To be precise, this is a technology that converts WiFi signals into electric currents. It was created by two students at the Pratt School of Engineering at Duke University in the United States, Alexander Katko and Allen Hawkes. Research and development. It is reported that the raw materials they developed are very inexpensive and can convert the WiFi signal transmitted in the air into electricity. However, the defect is a bit large. If the device is made small enough to fit inside the mobile phone, WiFi can be realized. Charging.

In fact, WiFi charging is not mysterious. The equipment designed by these two college students is actually a small five-unit array that can extract about 7V of voltage from the ubiquitous micro-waves in the air. You know, the charging output provided by the mobile phone adapter is only 5V. What if you want more electricity to charge the laptop? No problem, just add another unit to this five-unit array. Isn't it incredible?

The most interesting aspect of this invention is that although theoretically only half of the wired charging efficiency is available, enough current can be collected to charge the phone where the WiFi signal is strong enough. The idea is good, but I'm worried about whether it's really possible to make this device so small that it fits into the phone. Also, according to the law of conservation of energy, can the WiFi signal wave in the air be converted to a constant 5V 1A current? I hope that the two students will continue to study and use the mobile phone for the benefit of all people.