According to various embodiments, an electronic device may include a conductive bracket including an opening in at least part of the bracket, a display disposed on one surface of the bracket, a battery disposed on another surface of the bracket to face at least part of the opening, an antenna disposed within a specified range of the bracket and configure to output a signal of a first frequency band, and a conductive member comprising conductive material electrically coupled to the bracket by crossing at least part of the opening, wherein the opening is divided into a plurality of openings, to adjust resonance of a second frequency band of the opening generated by the signal output from the antenna.