Antenna structure

An antenna structure, comprising:

• a feeding radiation element, having a feeding point;
• a first radiation element, coupled to a first connection point on the feeding radiation element, wherein the first radiation element comprises a bending portion;
• a second radiation element, coupled to a second connection point on the feeding radiation element, and disposed adjacent to the bending portion, wherein the second radiation element is not parallel to the first radiation element;
• and
• a third radiation element, having a grounding point, and coupled to a third connection point on the feeding radiation element, wherein the third radiation element comprises a first protruding portion and a second protruding portion, and the first protruding portion and the second protruding portion extend in different directions;
• wherein the antenna structure covers a first frequency band and a second frequency band;
• wherein a first resonant path is formed from the feeding point through the first connection point to an open end of the first radiation element, and a length of the first resonant path is substantially equal to 0.25 wavelength of the first frequency band.