One scientist thinks she's found the secret on how to make the perfect invisibility cloak by using electrically active metamaterials.

Several prototypes have already been created already, but most of them bend radiation around whosoever wearing the cloak. The problem is that they only work with a small range of frequencies, which makes the cloak more visible in other frequencies.

Physicist Andrea Alu from the University of Texas at Austin wants to by make these cloaks out of materials that are electrically active. Her proposed design starts with metamaterials and adds CMOS negative impedance converters at the corners of the cloak.  Alu believes that using them in this way would allow cloaking of multiple frequencies.

Read on more here: Extreme Tech