Patent ID: 8854263

Claim:
An antenna structure, comprising: a microwave substrate; a first circuit having a feed point and a ground point disposed on the microwave substrate, the first circuit being an open loop structure having a discontinuous portion on one side thereof, wherein the feed point and the ground point are arranged respectively across the discontinuous portion, the first circuit extends from the feed point toward the ground point to form a feed portion, a sub-feed portion, a connecting portion, a sub-ground portion, and a ground portion, wherein the sub-feed portion is connected perpendicularly to the feed portion and the connecting portion, and wherein the sub-ground portion is connected perpendicularly to the ground portion and the connecting portion; a ground circuit disposed on the microwave substrate in connection with the ground point of the first circuit and arranged on one side of the first circuit closer to the ground point; and a second circuit disposed on the microwave substrate extendedly connected to a connecting point on the ground circuit and arranged on another side of the first circuit, wherein the second circuit extends from the connecting point to form an extension portion and a main portion formed by extending from the end of the extension portion on one side of the first circuit, wherein the extension portion is straight and parallel to the sub-feed portion, wherein the feed portion, the connecting portion, and the ground portion are parallel to the main portion, and wherein the main portion is disposed at one side away from the feed portion with respect to the connecting portion.