Patent attributes
An antenna structure includes a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, and a dielectric substrate. The first radiation element has a positive feeding point. The second radiation element is coupled to the first radiation element. The third radiation element has a negative feeding point. The fourth radiation element is coupled to the third radiation element. The fifth radiation element is floating. The dielectric substrate has a first surface and a second surface which are opposite to each other. The first radiation element and the third radiation element are both disposed on the first surface of the dielectric substrate. The second radiation element, the fourth radiation element, and the fifth radiation element are all disposed on the second surface of the dielectric substrate.