An electronic device according to various embodiments of the present disclosure can comprise: a housing including a first plate, a second plate oriented in the direction opposite to that of the first plate, and a side member surrounding the space between the first plate and the second plate; a plurality of insulating layers interposed between the first plate and the second plate; a printed circuit board in parallel to the second plate; an array of first conductive plates mounted on one layer of the printed circuit board; a second conductive plate mounted on one layer of the printed circuit board so as not to overlap the array when viewing from the top of the second plate; a wireless communication circuit electrically connected to the array and set to provide wireless communication at a frequency of 20-100 GHz; and a grip sensing circuit electrically connected to the second conductive plate. Other various embodiments can be possible.