An antenna assembly according to an embodiment is provided. The antenna assembly may comprise: a first dipole antenna and a second dipole antenna that have conductive patterns formed on both sides thereof on a surface of a dielectric substrate; a slot antenna having a slot area formed inside a ground pattern disposed between the first dipole antenna and the second dipole antenna; a first feeding unit having a first co-planar wave guide (CPW) feeding line and a second CPW feeding line that are electrically connected to the first dipole antenna and the second dipole antenna on the same plane; and a second feeding unit electrically connected to the slot area on the same plane and disposed between the first CPW feeding line and the second CPW feeding line.