Patent ID: 9142892
Filing Date: 2015-09-22
Classification: H01Q

Abstract:
1. A metamaterial having a thickness between a first and second surface, configured such that the first and second surfaces are perpendicularly disposed to a propagation direction of plane electromagnetic waves exiting the second surface, a curved surface within the metamaterial that extends through the thickness, wherein an electromagnetic wave diverging in the form of a spherical wave is emitted from a radiation source and incident on the first surface; a set of first straight lines connecting the radiation source to a corresponding set of points on a circular boundary line between the curved surface and the first surface of the metamaterial, and a second straight line perpendicular to the metamaterial, wherein each first straight line forms an angle θ with the second straight line, wherein the same angle θ which uniquely corresponds to each of the points in the set of points; additional sets of first straight lines connecting the radiation source to additional corresponding sets of points along the curved surface, wherein each additional set of points on the curved surface form a circular line and has a same uniquely corresponding angle θ and a same refractive index; the curved surface has a generatrix which extends along a direction of the thickness of the man-made composite material and between the first surface and the second surface is formed by rotating the generatrix about the second straight line; and refractive indices of the metamaterial decrease gradually as the angle θ increases.