An antenna includes a first radiator having a first end and a second end, where the second end or a middle position of the first radiator is grounded; a second radiator having a third end and a fourth end, the fourth end is disposed away from the first end relative to the third end, and the second end or a middle position of the second radiator is grounded; a feeding circuit configured to feed the first radiator and the second radiator, at the first end of the first radiator and the third end of the second radiator; and a tuning circuit configured to selectively connect the feeding circuit to the first end of the first radiator or the third end of the second radiator to feed the first radiator or the second radiator.