In several science fiction universes, a cloaking device is an advanced stealth system which causes a spaceship or individual to be invisible and extremely difficult to detect with normal sensors.
Several Researchers from US and UK have designed a cloak that prevents Microwaves from detecting objects. The Objects can be seen normally, but in Microwave spectrum, they are invisible.
Cloaking requires a special material, which can deflect microwaves around the object, making it invisible in the microwave spectrum.
via: i4u
