| The term negative index of refraction metamaterials (NIMs) refers to a peculiar class of engineered materials that exhibit unusual properties not observed in conventional materials. These properties are evident when the permittivity (mu) and permeability (epsilon) of propagating electromagnetic waves are simultaneously negative. Because of these special properties, NIMs may become attractive alternatives to conventional materials in microwave engineering.;Building upon fundamental research from previous work, this research synthesizes a novel design method based upon unit cell symmetry that results in a precise transmission response; in addition, the research introduces creative experimental methods (i.e., infrared imaging) to better characterize electromagnetic transmission in three dimensions. This research produced prototype materials for transmission in the X, Ku, and K microwave bands.;It is possible that metamaterials of this kind may become candidates for several specialized applications; for example, radome materials for satellite communications require low-loss, uniform wideband transmission for spread-spectrum modulation. In fact, many new applications are currently being explored, and it is likely that many others have yet to be conceived that may satisfy needs not fully met by conventional materials. |
