Multi-input multi-output (MIMO) antenna

A multi-input multi-output antenna includes a substrate; a first multi-band antenna formed on the substrate, including first and second radiators operated in first and second bands, respectively, the second radiator extending from a first terminal of the first radiator and surrounding the first radiator, the first band having an operation frequency higher than the second band; a second multi-band antenna formed on the substrate, including third and fourth radiators operated in the first and second bands, respectively, the fourth radiator extending from a second terminal of the third radiator and surrounding the third radiator; and a multi-band filter formed on the substrate, including first and second filter parts orthogonal to each other, the first filter part overlapped with the second filter part, the first filter part for filtering a first current flowing through the first and/or the third radiator, and the second filter part for filtering a second current flowing through the second and/or the fourth radi