An antenna structure includes a metal housing, a first feed source, and a second feed source. The metal housing includes a front frame, a backboard, and a side frame. The side frame is positioned between the front frame and the backboard. The side frame defines a slot and the front frame defines a gap. The gap communicates with the slot and extends across the front frame. The metal housing is divided into at least a long portion and a short portion by the slot and the gap. The first feed source is electrically connected to the long portion and the second feed source is electrically connected to the short portion.