An electronic device includes glass comprising at least a front surface of the electronic device, a display panel disposed under the glass, a conductive sheet attached to the display panel or integrated into the display panel, a support including a first portion comprising a side surface of the electronic device and a second portion comprising a mounting space for parts, in which the first portion of the support includes a metal portion comprising a radiator, and insulation portions disposed at opposite ends of the metal portion, and the second portion of the support includes at least one via hole or recess, a printed circuit board (PCB) including a ground, wireless communication circuitry disposed on the PCB, at least one processor operatively connected with the wireless communication circuitry, a flexible printed circuit board (FPCB) electrically connected with the conductive sheet to operatively connect the display panel with the at least one processor, and a cover comprising a rear surface of the electronic device. The glass, the display panel, and the conductive sheet are seated on a first surface of the second structure of the supporting member. The PCB and the cover of the electronic device are seated on a second surface of the second portion. The second portion of the support electrically connects the support with the ground of the PCB by making contact with one of conductive contacts of the PCB on at least one point. The FPCB includes a first path extending from the first surface to the second surface through the at least one via hole or the recess of the support. The first path of the FPCB extending to the second surface electrically connects the conductive sheet with the ground of the PCB. The conductive sheet is electrically connected with the metal portion of the support through a selection part comprising selective connection circuitry. The wireless communication circuitry receives a signal having a specific frequency band based on an electrical path comprising the wireless communication circuitry, the metal portion of the support, the selection part, and the conductive sheet.