Active Cloak Most Broadband to Date
AUSTIN, Texas, Dec. 19, 2013 — An active invisibility cloak — that is, one designed to work with an external power source — could significantly broaden the device’s operation bandwidth, moving its applications beyond camouflage. A team at the University of Texas at Austin led by Andrea Alù, associate professor at the Cockrell School of Engineering, 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...