Antenna, electronic device including antenna, and portable communication device

The portable communication device includes: a housing including a front plate, a rear plate facing away from the front plate, and a side member; a non-conductive member including a conductive portion formed in one or more regions of the non-conductive member; and the antenna module comprises a second PCB and an antenna array. The second PCB includes: a first peripheral edge portion; a second peripheral edge portion opposite the first peripheral edge portion; a third peripheral edge portion extending between a first end of the first peripheral edge portion and a first end of the second peripheral edge portion; and a fourth peripheral edge portion extending between a second end of the first peripheral edge portion and a second end of the second peripheral edge portion. The antenna array includes a plurality of antenna elements to form a directional beam. The first peripheral edge portion is parallel to a horizontal direction in which the plurality of antenna elements are arranged, and the conductive portions ar