An antenna assembly may include an antenna region having conductive patterns on one side surface of a dielectric substrate to radiate radio signals. The antenna region may include a first antenna structure and a second antenna structure. The antenna assembly may further include a ground region formed on a same plane as the antenna region. The ground region may include a first slot region and a second slot region. A first feeding line may be disposed at the first slot region, and a second feeding may be disposed at the second slot region. The antenna region may comprise a first conductive pattern, a second conductive pattern, a third conductive pattern, a fourth conductive pattern and a fifth conductive pattern.