An electronic device may include a housing including a first side surface, a first conductive portion disposed between at least a first segmenting portion and a second segmenting portion formed in the first side surface, and including a first feeding point, a printed circuit board disposed inside the housing and including a ground, a first electronic component disposed adjacent to the first conductive portion, a first conductive connection member electrically connected to the first electronic component, a first wireless communication circuit electrically connected to the first feeding point, a processor electrically connected to the first wireless communication circuit, and a matching circuit electrically connected to the first conductive connection member and the ground, and configured to electrically connect or disconnect the first conductive connection member and the ground under control of the processor. The radiation performance of the antenna can be improved by adjusting the resonance frequency of the antenna through the control of the matching circuit. Other various embodiments are possible.