An antenna board includes a first base board unit including a first insulating layer having a first receiving groove; a first antenna board unit disposed in the first receiving groove, including a second insulating layer and a third insulating layer disposed on the second insulating layer, and further including at least one of a first patch pattern disposed on the second insulating layer and covered by the third insulating layer and a second patch pattern disposed on the third insulating layer; and a first encapsulant covering at least a portion of the first antenna board unit and filling at least a portion of the first receiving groove, wherein a dielectric constant of the second insulating layer is different from a dielectric constant of the third insulating layer.