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1. An antenna assembly comprising: a dielectric substrate; and antenna elements defined as conductive patterns on the dielectric substrate and configured to radiate radio signals, wherein the antenna elements comprise: a first radiation structure, a second radiation structure, and a third radiation structure, wherein the first radiation structure includes: a first conductive pattern electrically connected with a first feeding portion; and a second conductive pattern and a third conductive pattern electrically connected with a ground; wherein the first conductive pattern is disposed between the second conductive pattern and the third conductive pattern; wherein a size of the second conductive pattern is smaller than a size of the third conductive pattern; wherein the second radiation structure includes: a fourth conductive pattern electrically connected with a second feeding portion; and a fifth conductive pattern and a sixth conductive pattern electrically connected with the ground; wherein the fourth conductive pattern is disposed between the fifth conductive pattern and the sixth conductive pattern; wherein a size of the fifth conductive pattern is bigger than a size of the sixth conductive pattern; wherein the third conductive pattern and the fifth conductive pattern are separated by a gap region, wherein the gap region comprises a first gap portion and a second gap portion; wherein a distance of the first gap portion is wider than a distance of the second gap portion, and wherein the first radiation structure and the second radiation structure are configured in a symmetrical structure with respect to a center line between the first radiation structure and the second radiation structure, wherein the third conductive pattern has a first region and a second region, wherein the first region of the third conductive pattern is connected with the second region of the third conductive pattern, wherein the fifth conductive pattern has a third region and a fourth region, wherein the third region of the fifth conductive pattern is connected with the fourth region of the fifth conductive pattern, and wherein a portion of the second region of the third conductive pattern and a portion of the fourth region of the fifth conductive pattern are connected with the ground, wherein a boundary of the third conductive pattern is faced with a boundary of the fifth conductive pattern, wherein the boundary of the third conductive pattern in the second region is separated from the boundary of the fifth conductive pattern in the fourth region by a first width, wherein the boundary of the third conductive pattern in the first region is separated from the boundary of the fifth conductive pattern in the third region by a second width, and wherein the first width is wider than the second width; and wherein the third radiation structure is disposed in the first gap region, wherein a width of the third radiation structure is the same as the distance of the second gap portion, and wherein a height of the third radiation structure is smaller than a height of the first gap portion, and wherein the third radiation structure is configured in a symmetrical structure with respect to the center line between the first radiation structure and the second radiation structure.
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