ANTENNA UNIT, ANTENNA SYSTEM AND COMMUNICATION DEVICE

Provided in the present application are an antenna unit. The antenna unit comprises a radiation structure, which comprises a first conductive structure, a conductive layer and a radiation metasurface, wherein the first conductive structure surrounds at least part of the edge of the conductive layer and is connected to the conductive layer; the radiation metasurface and the conductive layer are arranged in a stacked manner, the radiation metasurface is located on a side of the first conductive structure that is opposite to the conductive layer, and there is a first gap between the radiation metasurface and the first conductive structure; and the radiation metasurface comprises a plurality of conductive units, and there is a second gap between every two adjacent conductive units. Further provided in the present application are an antenna system comprising the antenna unit, and a communication device. By means of the solution of the present application, cross-polarization discrimination of an antenna can be impr