Ordinary Plastic Makes Metal Objects Invisible
A metal object can be made invisible with the help of ordinary plastic, Pekka Alitalo and Constantinos Valagiannopoulos, researchers from the School of Electrical Engineering at Aalto Univ., have shown in their study.
The object, however, does not become invisible to the human eye – only to electromagnetic radiation at microwave frequencies. In practical terms, this means that electromagnetic waves traveling, for example, between two antennas, do not detect an object located in their path, allowing the waves to travel the distance between them despite the obstacle, without any disruption to communications.
Read more: http://www.laboratoryequipment.com/news/2012/10/ordinary-plastic-makes-metal-objects-invisible