Dual-frequency antennae

The utility model discloses a dual-frequency antenna which comprises a feed-in part; one end of the feed-in part is provided with a feed point, and the other end is provided with a connection part which bends and extends downwards vertically; a first radiation part extends from one side edge of the connection part, and a first extending part extends from the other opposite side edge of the connection part; the free end of the upper edge of the first extending part bends and extends inwards vertically to form a second extending part; the first and the second extending parts form a second radiation part; the free end of the second extending part is provided with a ground plate which bends and extends vertically; the ground plate is provided with a ground start. With the structure, the utility model can realize the antenna which receives and transmits the signal of band areas covering 2.3 GHz to 2.7 GHz and 3.3 GHz to 3.8 GHz of the WiMAX protocol.