Patent ID: 9742074
Date: 2017-08-22
CPC Classifications: H01Q

Claim:
1. A Cassegrain-type metamaterial antenna, comprising: a metamaterial main reflector having a central through-hole, a feed source disposed in the central through-hole, and a sub-reflector disposed in front of the feed source, wherein an electromagnetic wave radiated by the feed source is emerged after being reflected by the sub-reflector and the metamaterial main reflector in sequence; the metamaterial main reflector comprises: a first core layer and a first reflection layer disposed on a rear surface of the first core layer, wherein the first core layer comprises at least one first core layer lamella, and the first core layer lamella comprises: a first base material and multiple first conductive geometric structures disposed on the first base material; and a far focus of the sub-reflector coincides with a phase center of the feed source; wherein a near focus of the sub-reflector coincides with a focus of the metamaterial main reflector; and the sub-reflector is a curved surface of a rotating two-sheet hyperboloid or a rotating ellipsoid; and a real axis of the rotating two-sheet hyperboloid or the rotating ellipsoid is perpendicular to the metamaterial main reflector; wherein refractive index distribution of any one of the first core layer lamella meets the following formulas: wherein n(R) indicates a refractive index value when a radius of the first core layer lamella is R, and a center of a circle of refractive index distribution of the first core layer lamella is an intersection point of the real axis of the rotating two-sheet hyperboloid or the rotating ellipsoid and the first core layer lamella, or a center of a circle of refractive index distribution of the first core layer lamella is an intersection point of the central axis of the metamaterial sub-reflector and the first core layer lamella; s indicates a distance from the near focus to a front surface of the metamaterial main reflector: d n n λ indicates a wavelength of an electromagnetic wave corresponding to a center frequency of an antenna; and floor indicates rounding down.