A device is provided. The device includes a housing forming at least one portion of a surface of the device, wherein the at least one portion of the surface includes first and second surfaces facing opposite to each other; a display at least partially housed in the housing and including a display area visible via at least one portion of the first surface; a substantially circular radiating element at least partially forming the first surface; a ground element between the first and second surfaces; a conductive element below the ground element; wireless communication circuitry electrically connected with the radiating element and establishing communication with an external electronic device; and a processor electrically connecting the conductive element with the ground element if a radiation characteristic relative to the radiating element satisfies a condition; and disconnecting the conductive element with the ground element if the radiation characteristic does not satisfy the condition.