Antenna device, antenna system and base station

The invention relates to an antenna device, an antenna system and a base station. The antenna device comprises a radiator and a feed assembly. Wherein the radiator comprises at least one radiation unit and at least one decoupling unit which are arranged on a dielectric substrate; the radiation units are in one-to-one correspondence with the decoupling units; the radiation unit comprises radiation arms which are annularly arranged; the decoupling unit is arranged in an area enclosed by the radiation arms and comprises a decoupling patch and a tuning branch knot; the tuning branch knot is arranged on the outer side of the decoupling patch; the feed assembly is electrically connected with the radiation unit and is insulated from the decoupling unit. By adopting the antenna device, the antenna radiation efficiency can be improved, and the antenna integration level in the base station can be improved. 本申请涉及一种天线装置、天线系统和基站，天线装置包括辐射器和馈电组件；其中，辐射器包括设置于介质基板的至少一个辐射单元和至少一个去耦单元；辐射单元与去耦单元一一对应；辐射单元包括呈环状设置的辐射臂；去耦单元设置于辐射臂所围成的区