An antenna comprises a first radiator, a second radiator, a third radiator located on a printed circuit board PCB. Operating frequency bands of the first radiator and the second radiator comprise a first frequency band, a resonance frequency band generated by the third radiator comprises the first frequency band. A current on the first radiator is orthogonal to a current on the second radiator, and a distance between the first radiator, the second radiator, and the third radiator is less than a half of a first wavelength, wherein the first wavelength is a wavelength corresponding to the first frequency band.