An electronic device is provided. The electronic device includes an antenna module including an antenna array. The antenna module includes a printed circuit board, conductive lines formed on the printed circuit board, each of the conductive lines having different lengths, a communication circuit including a first switch connected to ends of the conductive lines, and a front-end including a second switch connected to opposite ends of the conductive lines and phase shifters connected to the second switch. Based on a direction of a beam to be formed by the antenna array, a processor connected to the antenna module is configured to control the first switch and the second switch to select at least one of the conductive lines and to control a phase value of at least one of the phase shifters connected to the selected conductive line, based on a length of the selected conductive line.