Definitions and Classifications
Antennas and metamaterials

A metamaterial is an artificial structure possessing electromagnetic properties that go beyond (from the Greek prefix μ∊τα) those of conventional materials. Unlike these conventional materials, whose intrinsic properties stem from their microscopic structures, the unusual properties of metamaterials arise from their macroscopic structures. An article in Discover magazine reports that this property was first demonstrated by John Pendry while he was studying the carbon-based materials used to coat certain stealth ships