Antenna structure and relevant wireless communication device

The invention relates to an antenna structure, comprising a radiating element, a grounding element and a feed-in connection point; the grounding element comprises a first grounding sub-element and a second grounding sub-element; the second grounding sub-element is coupled with the first grounding sub-element and is provided with a cyclic structure; one section of the cyclic structure is partially overlapped with a first end of the radiating element along the specific direction and is away from the first end of the radiating element with a specific distance. The feed-in connection point is coupled between a second end of the radiating element and the first grounding sub-element.