A portable communication device comprising: a housing, wherein the housing includes a front plate, a rear plate facing away from the front plate, and a side member surrounding a space formed between the front plate and the rear plate; a first printed circuit board, PCB, (560, 1440, 1540); a non-conductive member (530, 1451, 1550) including a conductive portion (540, 1470, 1570) formed in one or more regions of the non-conductive member (530, 1451, 1550); and an antenna module (520, 1460, 1560) formed in the space, wherein the antenna module (520, 1460, 1560) includes: a second PCB including: a first peripheral edge portion, wherein the first peripheral edge portion faces the side member of the housing; a second peripheral edge portion opposed to 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; 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; and an antenna array configured to transmit or receive a signal in a first frequency band, the antenna array including a plurality of antenna elements (521, 522, 523, 524) disposed to form a directional beam, wherein the first peripheral edge portion is parallel to a horizontal direction and the plurality of antenna elements (521, 522, 523, 524) are arranged along the horizontal direction, characterized in that the conductive portion (540, 1470, 1570) is formed adjacent to at least a part of the second peripheral edge portion other than the first peripheral edge portion and is coupled with the antenna array to be configured to transmit or receive a signal in the first frequency band. a housing, wherein the housing includes a front plate, a rear plate facing away from the front plate, and a side member surrounding a space formed between the front plate and the rear plate; a first printed circuit board, PCB, (560, 1440, 1540); a non-conductive member (530, 1451, 1550) including a conductive portion (540, 1470, 1570) formed in one or more regions of the non-conductive member (530, 1451, 1550); and an antenna module (520, 1460, 1560) formed in the space, wherein the antenna module (520, 1460, 1560) includes: a second PCB including: a first peripheral edge portion, wherein the first peripheral edge portion faces the side member of the housing; a second peripheral edge portion opposed to 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; 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; and an antenna array configured to transmit or receive a signal in a first frequency band, the antenna array including a plurality of antenna elements (521, 522, 523, 524) disposed to form a directional beam, wherein the first peripheral edge portion is parallel to a horizontal direction and the plurality of antenna elements (521, 522, 523, 524) are arranged along the horizontal direction, characterized in that the conductive portion (540, 1470, 1570) is formed adjacent to at least a part of the second peripheral edge portion other than the first peripheral edge portion and is coupled with the antenna array to be configured to transmit or receive a signal in the first frequency band. a first peripheral edge portion, wherein the first peripheral edge portion faces the side member of the housing; a second peripheral edge portion opposed to 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; 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; and an antenna array configured to transmit or receive a signal in a first frequency band, the antenna array including a plurality of antenna elements (521, 522, 523, 524) disposed to form a directional beam, wherein the first peripheral edge portion is parallel to a horizontal direction and the plurality of antenna elements (521, 522, 523, 524) are arranged along the horizontal direction, characterized in that the conductive portion (540, 1470, 1570) is formed adjacent to at least a part of the second peripheral edge portion other than the first peripheral edge portion and is coupled with the antenna array to be configured to transmit or receive a signal in the first frequency band.