| CPC H01Q 21/065 (2013.01) [H01Q 9/0407 (2013.01)] | 9 Claims |

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1. An antenna device, comprising:
a first substrate, having a first top surface;
a second substrate, wherein the first substrate is stacked on the second substrate, the second substrate has a second top surface and a bottom surface, and the second top surface faces away from the bottom surface;
a radiation portion, disposed on the first top surface, and comprising a first radiation component, a second radiation component, a third radiation component and a fourth radiation component, wherein the first radiation component and the fourth radiation component are arranged on the first top surface symmetrically along a diagonal of the first top surface, and the second radiation component and the third radiation component are arranged on the first top surface symmetrically along another diagonal of the first top surface; and
a cross-shaped exciter, disposed on the second top surface, and being at least partially located within a coverage of the radiation portion, wherein the cross-shaped exciter comprises a lateral exciter portion, a first longitudinal exciter portion and a second longitudinal exciter portion, one end of the first longitudinal exciter portion and one end of the second longitudinal exciter portion are connected to two opposite sides of a central portion of the lateral exciter portion, respectively, and each of two opposite ends of the lateral exciter portion and another end of the first longitudinal exciter portion has a recess, respectively.
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