Antenna device and antenna module thereof

An antenna module, comprising:

• a substrate, comprising:
• an antenna radiation area having a first antenna radiation area and a second antenna radiation area, the first antenna radiation area being disposed and adjacent to the second antenna radiation area along a first direction, the first antenna radiation area having a first length along a second direction, the second antenna radiation area having a second length along the second direction, the second length being less than the first length;
• a first ground area disposed along the second direction and corresponded to the first antenna radiation area, a first distance along the second direction being between the first ground area and the first antenna radiation area;
• and
• a second ground area disposed along the second direction and corresponded to the second antenna radiation area, a second distance along the second direction being between the second ground area and the second antenna radiation area;
• wherein the first antenna radiation area comprises a feed-in area, the feed-in area is rectangular and elongated along the second direction to be in between the first ground area and the second ground area, and the first ground area, the feed-in area and the second ground area are arranged along the first direction.