An antenna includes: a first antenna portion and a second antenna portion arranged adjacently. The first antenna portion includes a first antenna branch and a first parasitic branch, and the second antenna portion includes a second antenna branch. The first parasitic branch is positioned between the first antenna branch and the second antenna branch. The first parasitic branch is L-shaped, and includes a first branch segment and a second branch segment. A first end of the first branch segment is in contact to a ground region, a second end of the first branch segment is joined to a first end of the second branch segment, and a second end of the second branch segment points towards the second antenna branch.