Antenna, external antenna and terminal equipment

The utility model provides an antenna, an external antenna and terminal equipment, and the antenna comprises a first plate body which is used for being connected with an external structure to fix the antenna; the radiation plate is used for radiating and receiving electromagnetic wave signals, and the radiation plate is arranged at one end of the first plate body in the width direction; one surface, close to the radiation plate, of the coupling plate forms a coupling surface used for increasing bandwidth, the coupling plate is arranged at the other end of the first plate body in the width direction, and the coupling plate and the radiation plate are arranged side by side at an interval; and the grounding plate is arranged on the coupling plate. According to the antenna and the terminal equipment provided by the invention, the antenna bandwidth is increased through the gap between the coupling plate and the grounding plate, and the radiation area of the antenna is increased by adding the coupling surface, so t