An electronic device is provided. The electronic device includes a housing, an antenna radiating body including a conductive metal, a first member disposed within the housing and electrically connected to the antenna radiating body, a printed circuit board (PCB) disposed within the housing, a flexible connecting member disposed between at least a portion of the first member and at least a portion of a second member and including a conductive material, and a capacitor including a first conductive plate that contacts the second member or formed by a portion of the second member, a second conductive plate, separated from the first conductive plate and electrically connected to the PCB, and a dielectric layer inserted between the first conductive plate and the second conductive plate.