An antenna assembly according to the present disclosure includes a dielectric substrate, and antenna elements configured as conductive patterns on the dielectric substrate to radiate radio signals. The antenna elements may include a first radiation structure and a second radiation structure. The first radiation structure includes a first conductive pattern electrically connected a first feeding portion, a second conductive pattern and a third conductive pattern electrically connected a ground. The second radiation structure includes a fourth conductive pattern electrically connected a second feeding portion and a fifth conductive pattern and a sixth conductive pattern electrically connected the ground. The first conductive pattern may be disposed between the second conductive pattern and the third conductive pattern.