An electronic device comprising: a circuit element; a printed circuit board comprising a first connection pad connected to the ground of the electronic device, a second connection pad, a third connection pad arranged between the first connection pad and the second connection pad and connected to a signal terminal of the circuit element and a fourth connection pad connected to the ground and spaced apart from the third connection pad in a same line, wherein the circuit element is mounted on the printed circuit board that comprises at least one antenna electrically connected to the circuit element; and a flexible printed circuit board, FPCB, comprising a coupling part connected to the printed circuit board and a connection part extending from the coupling part, wherein the FPCB comprises: first ground wiring connected to the first connection pad via a first access pad and extending from the coupling part to the connection part in a specified direction; second ground wiring connected to the second connection pad via a second access pad and extending from the coupling part to the connection part in the specified direction; signal wiring connected to the third connection pad via a third access pad and extending from the coupling part to the connection part in the specified direction, while being arranged between the first ground wiring and the second ground wiring; and third ground wiring connected to the fourth connection pad via a fourth access pad and extending from the coupling part to the connection part in the specified direction, while being arranged between the first ground wiring and the second ground wiring; wherein the third access pad is spaced apart from and surrounded by the first access pad, the second access pad, and the fourth access pad in the coupling part. a circuit element; a printed circuit board comprising a first connection pad connected to the ground of the electronic device, a second connection pad, a third connection pad arranged between the first connection pad and the second connection pad and connected to a signal terminal of the circuit element and a fourth connection pad connected to the ground and spaced apart from the third connection pad in a same line, wherein the circuit element is mounted on the printed circuit board that comprises at least one antenna electrically connected to the circuit element; and a flexible printed circuit board, FPCB, comprising a coupling part connected to the printed circuit board and a connection part extending from the coupling part, wherein the FPCB comprises: first ground wiring connected to the first connection pad via a first access pad and extending from the coupling part to the connection part in a specified direction; second ground wiring connected to the second connection pad via a second access pad and extending from the coupling part to the connection part in the specified direction; signal wiring connected to the third connection pad via a third access pad and extending from the coupling part to the connection part in the specified direction, while being arranged between the first ground wiring and the second ground wiring; and first ground wiring connected to the first connection pad via a first access pad and extending from the coupling part to the connection part in a specified direction; second ground wiring connected to the second connection pad via a second access pad and extending from the coupling part to the connection part in the specified direction; signal wiring connected to the third connection pad via a third access pad and extending from the coupling part to the connection part in the specified direction, while being arranged between the first ground wiring and the second ground wiring; and third ground wiring connected to the fourth connection pad via a fourth access pad and extending from the coupling part to the connection part in the specified direction, while being arranged between the first ground wiring and the second ground wiring; wherein the third access pad is spaced apart from and surrounded by the first access pad, the second access pad, and the fourth access pad in the coupling part.