This fourinch antenna could let you text from deep underground Engadget
Dawn Harmer/SLAC National Accelerator Laboratory There's a reason that scuba divers use sign language and that caves and tunnels create radio dead zones. The legal guidelines of physics save you radio signals from penetrating substances like water, soil and stone, and that's been a frustrating hindrance of cutting-edge wi-fi conversation. Now, the Department of Energy's SLAC National Accelerator Laboratory might have a solution: a four-inch-tall, pocket-sized antenna that emits very low frequency (VLF) radiation.
Unlike radio waves, which can be used for radio publicizes, radar and navigation structures, VLF radiation wavelengths can tour heaps of miles beyond the horizon and hundreds of ft thru the ground and water. This isn't the first time VLF radiation has been used to interrupt through physical barriers. But the brand new antenna is a whole lot smaller and might be used to build transmitters which are just a few kilos. That makes it appealing for army rescue and protection missions.
The SLAC-led team shared its work in Nature Communications today. According to SLAC, in tests, the brand new antenna produced VLF radiation 300 times extra effectively than preceding compact antennas and transmitted records with nearly 100 instances extra bandwidth. That could enable facts switch costs of greater than one hundred bits per 2nd -- sufficient to send a simple text. While that might not sound like a lot, it may make life-saving verbal exchange with submarines and deep bunkers or mines possible.
//www.engadget.com/2019/04/12/slac-antenna-vlf-radiation/
2019-04-12 09:00:03Z
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