| CPC H01Q 21/28 (2013.01) [H01Q 1/48 (2013.01); H01Q 1/521 (2013.01); H01Q 5/378 (2015.01); H01Q 9/42 (2013.01)] | 10 Claims |

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1. An antenna device, comprising:
a substrate; and
four antenna units, disposed on the substrate, wherein each of the four antenna units comprises:
an L-shaped radiation portion;
a hook-shaped coupling portion, adjacent to the L-shaped radiation portion; and
a ground portion, disposed around the L-shaped radiation portion and the hook-shaped coupling portion, wherein one end of the hook-shaped coupling portion is connected to the ground portion.
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