Engineers from the University of Massachusetts invented a station taking electricity from radio waves to recharge equipment
Wireless charging is gradually becoming popular with users. Nevertheless, it has one major drawback, which eliminates all the advantages. Now, in order to charge the gadget in this way, it is most often necessary to put it on top of the device.
In recent years, scientists and developers have been thinking about solving this problem. Looks like they did it. In any case, the engineers at the University of Massachusetts told about a new two-dimensional device that can transform electricity from radio waves.
How does the station that transforms electricity from radio waves?
Technology Americans based on the “theft” of Wi-Fi-waves, which are then converted into energy for charging. For the implementation of the system used rectenna, or rectifier antennas. They intercept the electromagnetic waves of alternating current from the environment, which often become Wi-Fi-signals. Nowadays wireless Internet points are located in almost every restaurant, home or even public transport. Having captured the signal, the antennas convert them to direct current to use them for charging.
As is the case with wireless devices, the design engineers from Massachusetts have one drawback. For the manufacture of rectennas, need hard and therefore inflexible materials such as silicon or gallium arsenide. They are more suitable for charging small electronic devices. Consequently, the MIT masters had a difficult task – to develop a flexible rectifier antenna in order to create a device for charging larger devices on its basis.
The solution was found. Instead of inappropriate material, a new one was found. Molybdenum disulfide has a thickness of only three atoms, because of which it gives in to considerable flexibility without losing its effectiveness. The team used it to design their gadget, which can pick up electricity from radio waves (like Wi-Fi) and convert them to 10 GHz signals.
However, the flexible rectenna is not perfect completely. In terms of its efficiency, it is almost 2 times less than some rectifiers, and at the same time, it produces a small amount of electricity – about 40 microwatts. On the one hand, this is not enough for powerful devices, but enough to recharge small electronic and medical devices. The developers insist that in the future they will improve the characteristics of the station.