Patent ID: 8749435

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, wherein 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, and wherein the first circuit is formed symmetrically, wherein the width across the discontinuous portion between the feed point and the ground point is shorter than the sub-feed portion, and the sub-feed portion is shorter than the feed 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 of the first circuit and arranged on the other side thereof, wherein the connecting point is connected to the sub-feed portion, the second circuit extends from the connecting point to form an extension portion and a main portion, the extension portion is a straight line or L-shaped, and wherein the main portion is formed by extending from the end of the extension portion on one side of the first circuit, the length from the feed point of the first circuit to the connecting point is shorter than the length from the ground point of the first circuit to the connecting point.