Dupple writes “During last week’s test, a CHAMP (Counter-electronics High-powered Microwave Advanced Missile Project) missile successfully disabled its target by firing high power microwaves into a building filled with computers and other electronics. ‘On Oct. 16th at 10:32 a.m. MST a Boeing Phantom Works team along with members from the U.S. Air Force Research Laboratory (AFRL) Directed Energy Directorate team, and Raytheon Ktech, suppliers of the High Power Microwave source, huddled in a conference room at Hill Air Force Base and watched the history making test unfold on a television monitor. CHAMP approached its first target and fired a burst of High Power Microwaves at a two story building built on the test range. Inside rows of personal computers and electrical systems were turned on to gauge the effects of the powerful radio waves. Seconds later the PC monitors went dark and cheers erupted in the conference room. CHAMP had successfully knocked out the computer and electrical systems in the target building. Even the television cameras set up to record the test were knocked off line without collateral damage.’”
Source: Boeing’s CHAMP Missile Uses Radio Waves To Remotely Disable PCs
Categories: slashdot CHAMP, force research laboratory, high power microwave, microwave source, missile, power, power microwaves, radio waves, target, test, U.S. Air
New submitter Ogi_UnixNut writes “In Venice, Italy, physicists have shown that it is possible to use two beams of incoherent radio waves, transmitted on the same frequency but encoded in two different orbital angular momentum states, to simultaneously transmit two independent radio channels. In principle this allows the implementation of an infinite number of channels in a given, fixed bandwidth, even without using polarization, multiport or dense coding techniques. It’s potentially a boon for congested spectrum problems, although at the moment I suspect it would only work for directional links.”
Source: ‘Twisted’ Waves Could Boost Capacity of Wireless Spectrum
Categories: slashdot Italy, momentum states, Ogi, orbital angular momentum, radio, radio waves, spectrum, submitter, UnixNut, Venice, venice italy, wireless spectrum
writes “Encryption keys on smartphones can be stolen via a technique using radio waves, says one of the world’s foremost crypto experts, Paul Kocher, whose firm Cryptography Research will demonstrate the hacking stunt with several types of smartphones at the upcoming RSA Conference in San Francisco next month.”
Source: Stealing Smartphone Crypto Keys Using Radio Waves
Categories: slashdot coondoggie, crypto, crypto keys, cryptography research, encryption, encryption keys, Paul Kocher, radio, radio waves, San Francisco, technique
writes “Everlasting green energy for RF tags and other low-power devices could be possible as scientists have harvested energy from ambient radio waves using cheap antennas printed by an ordinary inkjet. The scientists, from Georgia Tech, started at 100MHz but have now produced systems which scavenge power at up to 60GHz, allowing them to draw power from most of today’s major radio technologies.”
Source: Radio Energy Harvested With Inkjet-Printed Antenna
What’s the News: Metamaterials could improve wireless power transfer, letting us one day charge our devices without the hassle of cords and wires, says a study published last week in Physical Review B. While wireless power transfer already works to for tiny amounts of energy, metamaterials could theoretically be used to safely and efficientlyÂ boost the technique to handle more power, such as microwaves and lasers.
How the Heck:
- Using current techniques, the amount of energy needed to charge personal electronics could, if transmitted wirelessly, burn up whatever’s in its way—up to and including the device it’s supposed to charge. What’s more, energy tends to dissipate through open space, making this sort of power transfer extremely inefficient.
- But the researchers calculated that certain metamaterials—specifically, ones with effectively negative index of refraction—could transmit the needed power without frying anything. The metamaterials could be used to make a superlens that would stand between the power source and the device, essentially focusing the energy so it doesn’t scatter.
- According to their analyses, a hypothetical metamaterial array composed of thin copper-fiberglass loops, and resembling a set of Venetian blinds, could do the trick.
What’s the Context:
Not So Fast:
- Since the study was purely theoretical, scientists will still have to build and test out these metamaterial lenses to know they really work.
- Even if it works, this technique doesn’t mean you could have a universal charger. Every phone or tablet or what have you would still need its own,Â the researchers say, since the lens would be specifically designed to work with that particular device.
Reference: Yaroslav Urzhumov andÂ David R. Smith. “Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer.” Physical Review B, May 18, 2011. DOI: 10.1103/PhysRevB.83.205114
Image: Flickr / C. G. P. Grey
Source: Metamaterials Could Help Wirelessly Charge Electronics by Making Space Disappear
Categories: 80beats Acirc, B. While, C. G. P. Grey, David R. Smith, Heck, index of refraction, metamaterials, nbsp, power, radio waves, rsquo, theoretical scientists, transfer, venetian blinds
judgecorp writes “More progress for WiGig, the proposal for 3Gbps wireless links on 60GHz radio waves. The WiGig group has signed a deal with VESA, the display standards group, to include WiGig as a fast wireless option in VESA’s DisplayPort standard. As well as letting you use a TV as a display for your phone, without having to connect a cable, it will also make synching and file transfer quicker.”
Source: Gigabit Wireless Will Link Smartphones To TVs
Categories: slashdot display, Displayport, displays, group, hardware, judgecorp, radio waves, standards group, tvs, VESA, WiGig, Wireless, wireless option
thomst passes along news out of the recent AAAS meeting of a new explanation for pulsar beams that involves faster-than-light currents. Here are Los Alamos’s press release and three related papers on the arXiv. “The new model explains the beam emissions from pulsars as products of superluminal currents within the spinning neutron stars’ atmospheres. According to the authors’ model, the current generated is, itself, faster than light, although the particles that compose it never individually exceed the universal speed limit, thereby preventing Einsteinian post-mortem rotation. The new model is a general explanation of the phenomenon of pulsar beam emissions that explains emissions at all observed frequencies (and different pulsars emit everything from radio waves to x-rays), which no previous model has done.”
Source: FTL Currents May Power Pulsar Beams
Categories: slashdot beam, explanation, forthelose, Model, neutron stars, new explanation, Pulsar, pulsars, radio waves, Science, slowerthanfast, space, thomst, x rays