Antenna structure and mobile device

An antenna structure, comprising:

• a metal mechanism element, wherein a slot is formed in the metal mechanism element;
• a feeding radiation element, having a feeding point;
• a first radiation element, coupled to the feeding radiation element;
• a tuning circuit, coupled to the first radiation element;
• a second radiation element, coupled to the feeding radiation element, wherein the feeding radiation element is positioned between the first radiation element and the second radiation element;
• a third radiation element, coupled to a first grounding point on the metal mechanism;
• a fourth radiation element, coupled to a second grounding point on the metal mechanism;
• a fifth radiation element, coupled to a third grounding point on the metal mechanism;
• and
• a sixth radiation element, coupled to the feeding radiation element;
• wherein the feeding radiation element, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, the fifth radiation element, and the sixth radiation element are disposed inside the slot of the metal mechanism element.