An electronic device comprising: a display unit ; a printed circuit board, PCB , below the display unit ; an array antenna including a transparent electrode material and being disposed within the display unit ; and a radio frequency integrated circuit, RFIC , electrically connected to the array antenna , wherein the array antenna includes a plurality of antenna elements each including: first and second sides perpendicular to each other disposed slopingly at a predetermined angle with respect to one side of the display unit ; and a feeding part including first and second feeding lines connecting the antenna element and the RFIC , wherein the RFIC is disposed on the PCB below the display unit , wherein the RFIC is further disposed on a flexible printed circuit board, FPCB, connecting the display unit and the printed circuit board , such that the RFIC and the array antenna have an electric connection by the FPCB between the feeding part and the RFIC , wherein the display unit comprises a first layer and the FPCB comprises a second layer , wherein each of the antenna elements is disposed on the first layer , wherein the first and second feeding lines are disposed on the second layer below the first layer , and wherein electrical signals from the first and second feeding lines are slot-coupled to the antenna element through a slot in which a ground pattern is removed on a ground plane on a third layer between the first and second layers . a display unit ; a printed circuit board, PCB , below the display unit ; an array antenna including a transparent electrode material and being disposed within the display unit ; and a radio frequency integrated circuit, RFIC , electrically connected to the array antenna , wherein the array antenna includes a plurality of antenna elements each including: first and second sides perpendicular to each other disposed slopingly at a predetermined angle with respect to one side of the display unit ; and a feeding part including first and second feeding lines connecting the antenna element and the RFIC , wherein the RFIC is disposed on the PCB below the display unit , wherein the RFIC is further disposed on a flexible printed circuit board, FPCB, connecting the display unit and the printed circuit board , such that the RFIC and the array antenna have an electric connection by the FPCB between the feeding part and the RFIC , wherein the display unit comprises a first layer and the FPCB comprises a second layer , wherein each of the antenna elements is disposed on the first layer , wherein the first and second feeding lines are disposed on the second layer below the first layer , and wherein electrical signals from the first and second feeding lines are slot-coupled to the antenna element through a slot in which a ground pattern is removed on a ground plane on a third layer between the first and second layers . first and second sides perpendicular to each other disposed slopingly at a predetermined angle with respect to one side of the display unit ; and a feeding part including first and second feeding lines connecting the antenna element and the RFIC , wherein the RFIC is disposed on the PCB below the display unit , wherein the RFIC is further disposed on a flexible printed circuit board, FPCB, connecting the display unit and the printed circuit board , such that the RFIC and the array antenna have an electric connection by the FPCB between the feeding part and the RFIC , wherein the display unit comprises a first layer and the FPCB comprises a second layer , wherein each of the antenna elements is disposed on the first layer , wherein the first and second feeding lines are disposed on the second layer below the first layer , and wherein electrical signals from the first and second feeding lines are slot-coupled to the antenna element through a slot in which a ground pattern is removed on a ground plane on a third layer between the first and second layers . <EOS>