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    'Stealth' Antenna Made Of Gas, Impervious To Jamming
    By News Staff | November 12th 2007 01:58 PM | 1 comment | Print | E-mail | Track Comments
    A new antenna made of plasma (a gas heated to the point that the electrons are ripped free of atoms and molecules) works just like conventional metal antennas, except that it vanishes when you turn it off.

    That's important on the battlefield and in other applications where antennas need to be kept out of sight. In addition, unlike metal antennas, the electrical characteristics of a plasma antenna can be rapidly adjusted to counteract signal jamming attempts.

    Plasma antennas behave much like solid metal antennas because electrons flow freely in the hot gas, just as they do in metal conductors. But plasmas only exist when the gasses they're made of are very hot. The moment the energy source heating a plasma antenna is shut off, the plasma turns back into a plain old (non conductive) gas. As far as radio signals and antenna detectors go, the antenna effectively disappears when the plasma cools down.

    This prototype plasma antenna is stealthy, versatile, and jam-resistant. Credit: T. R. Anderson and I. Alexeff



    The antenna design being presented at next week's APS Division of Plasma Physics meeting in Orlando consists of gas-filled tubes reminiscent of neon bulbs. The physicists presenting the design propose that an array of many small plasma elements could lead to a highly versatile antenna that could be reconfigured simply by turning on or off various elements.

    - T. R. Anderson and I. Alexeff
    2007 APS Division of Plasma Physics annual meeting
    November 12, 2007

    Comments

    riposte
    I might me missing something here, BUT... There's a little company called "Patriot Scientific" which used to own this very technology. They sold it to "ASI Technology", who in turn sold it to "Markland Technology". Looks like they're still in business: http://www.marklandtech.com/technology_portfolio/gasplasma.html Good luck to one and all...I'm not a patent attorney.