Scientists develop a device capable of converting WiFi signals into electricity
American and Spanish scientists have developed a flexible device that can convert Wi-Fi signals to power electronic devices, portable devices and medical devices.
The study, published on Monday in the journal Nature, describes a fully flexible radio frequency antenna that can convert AC electromagnetic waves into DC electricity.
The antenna is made of a new two-dimensional rectifier called molybdenum disulfide (MoS2), which is only three atoms thick, making it one of the best semiconductors in the world.
According to the study, when AC signals, including Wi-Fi, travel to the semiconductor, they become DC voltage that can power the collars or upgrade the batteries.
In addition, the device is flexible so that it can cover very large surfaces, such as the surfaces of buildings.
"We have created a new way to strengthen the electronic systems of the future by collecting Wi-Fi power in a way that easily integrates into large areas," says co-author of the article, Thomas Palacio, professor of electrical engineering at the Massachusetts Institute of Technology Technology (MIT).
In experiments, the device can produce approximately 40 microwatts of power when exposed to typical power levels of Wi-Fi signals that are about 150 microwatts. It's enough to light up a simple mobile screen or silicon chips.
Most of the flexible rectifiers previously reported can not operate at low frequencies so they can not capture and convert the frequencies of gigaherts used by cell phones and Wi-Fi signals, according to researchers.
But the MoS2 material is much faster in signal conversion and allows you to record and convert up to 10 gigahertz wireless signals.
The maximum output efficiency for the current device is 40 percent, depending on the input power of the Wi-Fi input. According to the study, the typical power level of Wi-Fi, the energy efficiency of the rectifier MoS2 is about 30 percent.
In addition, the device can be used to power implanted medical devices, as it will not release toxic lithium.
"It is much better to collect energy from the environment to feed these small laboratories in the body and to transfer data to external computers," said co-author of the text, Jesus Grail, a researcher at the Technical University of Madrid.