Abstract: An antenna structure includes a positive feeding point, a negative feeding point, a radiation element, and a grounding element. The radiation element includes a first radiator and a second radiator. The first radiator has a first end coupled to the positive feeding point, and has a plurality of first side edges. The second radiator has a first end coupled to the negative feeding point, and has a plurality of second side edges. Herein the second radiator at least partially surrounds the first radiator, such that there are a plurality of predetermined gaps existed in between the plurality of first side edges of the first radiator and the plurality of second side edges of the second radiator to form coupling effects. The grounding element is coupled to the second radiator.

Abstract: An antenna structure includes a positive feeding point, a negative feeding point, a radiation element, and a grounding element. The radiation element includes a first radiator and a second radiator. The first radiator has a first end coupled to the positive feeding point, and has a plurality of first side edges. The second radiator has a first end coupled to the negative feeding point, and has a plurality of second side edges. Herein the second radiator at least partially surrounds the first radiator, such that there are a plurality of predetermined gaps existed in between the plurality of first side edges of the first radiator and the plurality of second side edges of the second radiator to form coupling effects. The grounding element is coupled to the second radiator.

Abstract: A broadband antenna for wireless signal transmission of an electronic device is disclosed. The broadband antenna has a radiation area, a ground area, a feeding point, a first tuning bar, and a second tuning bar. The feeding point is disposed on the radiation area and is used for feeding a signal. The first tuning bar is used for adjusting a high frequency bandwidth of the broadband antenna. The second tuning bar is used for adjusting a low frequency bandwidth of the broadband antenna. The length of the first tuning bar is less than the length of the second tuning bar.