Abstract: An antenna structure includes a ground element, 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 feeding point. The first radiation element is coupled through the second radiation element to the ground element. The third radiation element is coupled to the first radiation element and the second radiation element. The fourth radiation element is coupled to the first radiation element and the third radiation element. The fifth radiation element is coupled to the ground element. The fifth radiation element is adjacent to the fourth radiation element. The ground element, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, and the fifth radiation element are disposed on the dielectric substrate.

Abstract: An antenna structure is provided. The antenna structure includes a first radiation element, a second radiation element, and a feeding element. The first radiation element includes a first radiation portion, a second radiation portion, and a feeding portion. The second radiation element includes a third radiation portion, a fourth radiation portion, and a grounding portion. The third radiation portion and the first radiation portion are separate from each other and coupled to each other, the third radiation portion and the second radiation portion are separate from each other and coupled to each other, and the fourth radiation portion and the first radiation portion are separate from each other and coupled to each other. The feeding element is electrically connected with the feeding portion and the grounding portion. A junction between the feeding element and the feeding portion is defined as a feeding point.

Abstract: An antenna structure is provided. The antenna structure includes a first radiation element, a second radiation element, and a feeding element. The first radiation element includes a first radiation portion, a second radiation portion, and a feeding portion. The second radiation element includes a third radiation portion, a fourth radiation portion, and a grounding portion. The third radiation portion and the first radiation portion are separate from each other and coupled to each other, the third radiation portion and the second radiation portion are separate from each other and coupled to each other, and the fourth radiation portion and the first radiation portion are separate from each other and coupled to each other. The feeding element is electrically connected with the feeding portion and the grounding portion. A junction between the feeding element and the feeding portion is defined as a feeding point.