Patent ID: 8421705

Claim:
An antenna structure, comprising: a positive feeding point and a negative feeding point; a radiation element, comprising: a first radiator, having a first end at which a feeding signal source is coupled to the positive feeding point, and having a plurality of first side edges; and a second radiator, having a first end at which the feeding signal source is coupled to the negative feeding point, and having a plurality of second side edges, wherein the second radiator at least partially surrounds the first radiator, and there are a plurality of predetermined gaps existed in between the plurality of first side edges of the first radiator and the plurality of second side edges of the second radiator to form coupling effects; a substrate, having a first and a second plane opposite to the first plane, wherein the first radiator is located on the first plane, and the second radiator is located on the second plane; and a grounding element, coupled to the second radiator, comprising: a first grounding sub-element and a second grounding sub-element, wherein the first grounding sub-element at least overlaps the second grounding sub-element; the first grounding sub-element as well as the first radiator are located on the first plane; and the second grounding sub-element as well as the second radiator are located on the second plane.