An antenna structure is suitable for being embedded in an electronic device. The antenna structure includes a grounding plate, a radiating plate, and a shorting plate. The grounding plate has a body and a bending portion extending from the body. The radiating plate is disposed above the grounding plate and is extended with an auxiliary radiating plate. The gap between the bending portion and the radiating plate is less than that between the body and the radiating plate. In addition, one end of the shorting plate is connected to the grounding plate, and the other end of the shorting plate is connected to the radiating plate.