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June 2, 2020 10:00 am

5G Obliterates Your Phone Battery, But a Power-Saving Fix Is Coming

It's no secret that 5G networks drain battery. "To rectify that grim side effect, researchers at the University of Texas at Austin and the University of Lille in France have developed a new radio-frequency switch they say is 50 times more energy efficient than the current solid-state switches," reports Popular Mechanics. From the report: The solution is actually rooted right in the problem. Because smartphones are packed with switches that perform duties like hopping back and forth between different networks and spectrum frequencies (4G to LTE, to WiFi, to Bluetooth, etc.), batteries drain much faster. State-of-the-art radio-frequency switches are constantly running in the background on your iPhone or Android device, consuming not only battery life, but processing power. So when the limited number of 5G-enabled smartphones on the market are constantly bouncing back and forth between 4G and 5G communications, for instance, the problem is amplified. "The switch we have developed can transmit an HDTV stream at a 100GHz frequency, and that is an achievement in broadband switch technology," lead researcher Deji Akinwande, a professor at the University of Texas at Austin, said in a prepared statement. And the premise is simple: the switches stay off most of the time. Unless the radio-frequency switches are actively helping the device jump between networks at that precise point in time, they stay off, preserving precious battery life for other processes. To build it, the scientists used a nanomaterial called hexagonal boron nitride, a newcomer in the materials science field that comes from the same family as graphene, a honeycomb-lattice sheet of carbon atoms used in everything from bike tires to cleaning up radioactive waste. According to research in Semiconductors and Semimetals, hexagonal boron nitride is only as thick as a single layer of atoms and is the thinnest known insulator in the world, with a thickness of 0.33 nanometers (for comparison's sake, a human hair is about 100,000 nanometers thick). In this case, these scientists used a single layer of boron and nitrogen atoms in a honeycomb pattern. Then, they sandwiched the layers between a set of gold electrodes. The findings have been published in the journal Nature Electronics.

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