According to various example embodiments, an electronic device includes: a housing; a conductive member formed as a part of the housing or disposed in the housing as at least a part of the housing; acommunication circuit electrically connected to a first region of the conductive member; a ground electrically connected to a second region of the conductive member spaced from the first region of theconductive member; a tunable circuit interposed in an electric connection path electrically connected with the ground in a third region of the conductive member, the third region being located between the first region and the second region of the conductive member; and at least one processor configured to generate a control signal based on a current mode of the electronic device and to provide the control signal to the tunable circuit.