An antenna includes a feed contact, a first antenna branch and a second antenna branch, wherein the first antenna branch and the second antenna branch are respectively electrically connected with the feed contact, forming electromagnetic coupling; the first antenna branch has a specified length for sending and receiving signals in a first frequency band; and the second antenna branch has a specified length for sending and receiving signals in a second frequency band. A terminal device including such an antenna can have improved appearance, improved effect of receiving communication signals in different frequency bands, reduced RF loss, and improved the utilization of the internal space.