The cover shows a conceptual model of a metamaterial planar-reflector satellite antenna. This planar-reflector antenna is designed using inhomogeneous electromagnetic metamaterials, artificial composite materials that reflect and converge the planar wave from a satellite to an antenna feed. A magnification view of part of the reflector shows the topology and distribution of the metamaterial unit cells. Further magnification shows the distribution of atoms. While it is difficult to manipulate atoms, it is relatively easy to arrange metamaterial unit cells. Although the picture shown here is conceptual, satellite antennas using metamaterial technology have already been produced and installed in over 22 cities across China, in the first use of this type of antenna anywhere in the world.
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