30 Apr '13, 8pm

Invisibility cloak hides objects from radio waves

Invisibility cloak hides objects from radio waves

Researchers at the University of Texas at Austin have built an "invisibility" cloak that can hide 3D objects from microwaves. Unlike most previous cloaking techniques, which have used bulk metamaterials to bend incoming waves around an object, this latest approach uses a very thin form-fitting "metascreen" - just microns thick - to cancel microwaves scattering off a 3D object, making it invisible to microwave radiation. The metascreen consists of strips of 66-µm-thick copper tape attached to a 100-µm-thick, flexible polycarbonate film in a fishnet design. In experiments it was able to hide a 7-inch-long rod from microwaves, with optimal functionality at 3.6 GHz. Experimental setup for the far-field measurement of the cloaked cylinder. According to the researchers, such a "mantle cloaking" approach offers conformability, manufacturing, and bandwidth advantages over existing...

Full article: http://www.edn.com/electronics-blogs/tech-edge/4413109/In...

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Do-it-yourself invisibility with 3-D printing - ECN..

Do-it-yourself invisibility with 3-D printing -...

ecnmag.com 07 May '13, 12pm

DURHAM, N.C. – Seven years ago, Duke University engineers demonstrated the first working invisibility cloak in complex lab...