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Science & Technology
A New Design Of A Real-Life Invisibility Cloak Much Closer To Perfection
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<blockquote data-quote="Opmmur" data-source="post: 78123" data-attributes="member: 13"><p><span style="font-size: 26px"><span style="color: #80ff00"><em><strong>Researchers Design First Battery-Powered Invisibility </strong></em></span></span></p><p><span style="font-size: 26px"><span style="color: #80ff00"><em><strong>Cloaking Device</strong></em></span></span></p><p></p><p>December 20, 2013</p><p></p><p><a href="http://www.binarycse.com/researchers-design-first-battery-powered-invisibility-cloaking-device/" target="_blank"><img src="http://www.binarycse.com/wp-content/uploads/2013/12/harry-potter-invisibility-cloak-631x348.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> </p><ul> <li data-xf-list-type="ul">According to a latest news release, the researchers from the University of Texas at Austin’s CockrellSchool of Engineering has proposed the first design of a cloaking device that uses an external source of energy to significantly broaden its bandwidth of operation.<br /> <br /> The researchers explain that in computer networking and computer science, bandwidth is referred to as a measurement of bit-rate of available or consumed data communication resources, which are expressed in bits per second or multiples of it. Andrea Alù, associate professor at the Cockrell School of Engineering, and his team have proposed a design for an active cloak that draws energy from a battery, allowing objects to become undetectable to radio sensors over a greater range of frequencies.<br /> <br /> A <strong>cloak</strong> is a type of loose garment that is worn over indoor clothing and serves the same purpose as an overcoat; it protects the wearer from the cold, rain or wind for example, or it may form part of a fashionable outfit or uniform.<br /> <br /> Cloaks have so far been realized with so-called passive technology, which means that they are not designed to draw energy from an external source. They are typically based on metamaterials (advanced artificial materials) or metasurfaces (a flexible, ultrathin metamaterial) that can suppress the scattering of light that bounces off an object, making an object less visible.<br /> <br /> When the scattered fields from the cloak and the object interfere, they cancel each other out, and the overall effect is transparency to radio-wave detectors. They can suppress 100 times or more the detectability at specific design frequencies. Although the proposed design works for radio waves, active cloaks could one day be designed to make detection by the human eye more difficult.<br /> <br /> This research team has come up with a novel design for an active cloaking device, it is also revealed by the researchers that this device is able to draws energy from a battery. The proposed active cloak uses a battery, circuits and amplifiers to boost signals, which makes possible the reduction of scattering over a greater range of frequencies. This design, which covers a very broad frequency range, will provide the most broadband and robust performance of a cloak to date. Additionally, the proposed active technology can be thinner and less conspicuous than conventional cloaks.<br /> <br /> “In our case, by introducing these suitable amplifiers along the cloaking surface, we can break the fundamental limits of passive cloaks and realize a ‘non-Foster’ surface reactance that decreases, rather than increases, with frequency, significantly broadening the bandwidth of operation,” Alù said.<br /> <br /> </li> </ul></blockquote><p></p>
[QUOTE="Opmmur, post: 78123, member: 13"] [SIZE=7][COLOR=#80ff00][I][B]Researchers Design First Battery-Powered Invisibility [/B][/I] [I][B]Cloaking Device[/B][/I][/COLOR][/SIZE] December 20, 2013 [URL='http://www.binarycse.com/researchers-design-first-battery-powered-invisibility-cloaking-device/'][IMG]http://www.binarycse.com/wp-content/uploads/2013/12/harry-potter-invisibility-cloak-631x348.jpg[/IMG][/URL] [LIST] [*]According to a latest news release, the researchers from the University of Texas at Austin’s CockrellSchool of Engineering has proposed the first design of a cloaking device that uses an external source of energy to significantly broaden its bandwidth of operation. The researchers explain that in computer networking and computer science, bandwidth is referred to as a measurement of bit-rate of available or consumed data communication resources, which are expressed in bits per second or multiples of it. Andrea Alù, associate professor at the Cockrell School of Engineering, and his team have proposed a design for an active cloak that draws energy from a battery, allowing objects to become undetectable to radio sensors over a greater range of frequencies. A [B]cloak[/B] is a type of loose garment that is worn over indoor clothing and serves the same purpose as an overcoat; it protects the wearer from the cold, rain or wind for example, or it may form part of a fashionable outfit or uniform. Cloaks have so far been realized with so-called passive technology, which means that they are not designed to draw energy from an external source. They are typically based on metamaterials (advanced artificial materials) or metasurfaces (a flexible, ultrathin metamaterial) that can suppress the scattering of light that bounces off an object, making an object less visible. When the scattered fields from the cloak and the object interfere, they cancel each other out, and the overall effect is transparency to radio-wave detectors. They can suppress 100 times or more the detectability at specific design frequencies. Although the proposed design works for radio waves, active cloaks could one day be designed to make detection by the human eye more difficult. This research team has come up with a novel design for an active cloaking device, it is also revealed by the researchers that this device is able to draws energy from a battery. The proposed active cloak uses a battery, circuits and amplifiers to boost signals, which makes possible the reduction of scattering over a greater range of frequencies. This design, which covers a very broad frequency range, will provide the most broadband and robust performance of a cloak to date. Additionally, the proposed active technology can be thinner and less conspicuous than conventional cloaks. “In our case, by introducing these suitable amplifiers along the cloaking surface, we can break the fundamental limits of passive cloaks and realize a ‘non-Foster’ surface reactance that decreases, rather than increases, with frequency, significantly broadening the bandwidth of operation,” Alù said. [/LIST] [/QUOTE]
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A New Design Of A Real-Life Invisibility Cloak Much Closer To Perfection
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