An antenna device is provided for an electronic device. The antenna device includes a first radiation element and a second radiation element spaced apart from each other. The antenna device also includes a first feeding unit and a second feeding unit for feeding electricity to the first radiation element and the second radiation element, respectively. The antenna device further includes a first feeding port for connecting the first radiation element to the first feeding unit, and a second feeding port for connecting the second radiation element to the second feeding unit. The first feeding port and the second feeding port form electric/magnetic field coupling (E/H coupling) having a phase that differs from that of E/H coupling between the first radiation element and the second radiation element.