An antenna structure and an electronic device are provided. The antenna structure includes a connecting part, a grounding part, a first extending part and a second extending part. An angle is larger than zero between a first vector from the connecting point to the first open terminal and a second vector from the connecting point to the second open terminal. Also, a difference between the path length of a first path length and the path length of a second path length would be a quarter of the wave length of the radio frequency signal or a positive integer times thereof, so that the antenna is capable of receiving the radio frequency signal with circular polarizing.