An electronic device, comprising: a housing (401, 501); an antenna unit (405, 505) disposed inside the housing and comprising a conductive pattern (406, 553a, 553b) configured to generate a magnetic field; a plate comprising at least a part of the housing and comprising a material through which at least a part of the magnetic field generated by the conductive pattern (406, 553a, 553b) can pass; and a control circuit configured to transmit at least one piece of payment information to an external device using the conductive pattern (406, 553a, 553b), wherein the antenna unit (405, 505) comprising the conductive pattern (406, 553a, 553b) comprises: a first coil antenna, forming a loop antenna, having a first plurality of turns that passes through the antenna unit (405, 505) in directions substantially perpendicular to one surface of the plate; and a second coil antenna, forming a loop antenna, having a second plurality of turns that is substantially parallel to the one surface of the plate, and a shielding structure comprising a shielding material disposed inside the first coil antenna or below the second coil antenna (553a, 553b), such that magnetic coupling between the first and the second coil antenna (553a, 553b) is prevented, wherein the antenna unit (405, 505) comprises a first antenna unit comprising a plane in which the second coil antenna and a part of the first coil antenna are disposed; and a second antenna unit disposed below the first antenna unit and comprising another plane in which another part of the first coil antenna is disposed, characterized in that: the second coil antenna has a planar coil shape on the first antenna unit to surround the first coil antenna. a housing (401, 501); an antenna unit (405, 505) disposed inside the housing and comprising a conductive pattern (406, 553a, 553b) configured to generate a magnetic field; a plate comprising at least a part of the housing and comprising a material through which at least a part of the magnetic field generated by the conductive pattern (406, 553a, 553b) can pass; and a control circuit configured to transmit at least one piece of payment information to an external device using the conductive pattern (406, 553a, 553b), wherein the antenna unit (405, 505) comprising the conductive pattern (406, 553a, 553b) comprises: a first coil antenna, forming a loop antenna, having a first plurality of turns that passes through the antenna unit (405, 505) in directions substantially perpendicular to one surface of the plate; and a second coil antenna, forming a loop antenna, having a second plurality of turns that is substantially parallel to the one surface of the plate, and a shielding structure comprising a shielding material disposed inside the first coil antenna or below the second coil antenna (553a, 553b), such that magnetic coupling between the first and the second coil antenna (553a, 553b) is prevented, wherein the antenna unit (405, 505) comprises a first antenna unit comprising a plane in which the second coil antenna and a part of the first coil antenna are disposed; and a second antenna unit disposed below the first antenna unit and comprising another plane in which another part of the first coil antenna is disposed, characterized in that: the second coil antenna has a planar coil shape on the first antenna unit to surround the first coil antenna.