Materials to protect from electromagnetic pollution
There is a need to make certain objects invisible, or at least less visible, to radar. Such objects range from submarine periscopes to complete warships, from stealth aircraft to wind turbines.
Materials Science can meet this need, providing materials that absorb the incident microwave energy – radar absorbing materials (RAM) – or complete structures designed to do the same thing – radar absorbing structures (RAS). A number of solutions incorporate reinforced plastics, composites and metamaterials. This kind of materials can be used to protect sensitive areas from electromagnetic pollution but the high absorption they have can create problems to the functioning of cell telephony, which needs the electromagnetic waves reflections on building structures to work well.