An electronic device (101; 400; 501) for providing credit card transaction information to an external device, the electronic device (101; 400; 501) comprising: a housing; a conductive pattern (1053a, 1053b, 1053c) that is arranged within the housing and is formed to generate a magnetic field; a plate (402a, 402b) that forms at least a part of a first surface of the housing and includes a material that at least partially transmits the magnetic field generated by the conductive pattern (1053a, 1053b, 1053c); and a communication circuit that is configured to transmit at least one transaction information to an external device by using the conductive pattern (1053a, 1053b, 1053c); and, wherein the conductive pattern (1053a, 1053b, 1053c) includes: a first end electrically connected to the communication circuit; a second end electrically connected to the communication circuit; and a coil that is connected between the first end and the second end and includes a plurality of turns that are substantially parallel to a surface of the plate (402a, 402b); wherein, when viewed from an upper side of the plate (402a, 402b), the coil includes: a first section (1153d; 1753d) that includes portions of the conductive lines forming the plurality of turns, the conductive lines extending substantially parallel to each other; and a second section (1153e; 1753e) that includes other portions of the conductive lines extending substantially parallel to each other and forming the plurality of turns, wherein the second section (1153e; 1753e) is arranged to enclose a periphery of the first section (1153d; 1753d); and wherein in the first section (1153d; 1753d), a spacing between the portions of the conductive lines is less than a spacing between the other portions of the conductive lines in the second section (1153e; 1753e) such that the second section (1153d; 1753e) includes less conductive line portions per unit area than the first section (1153e; 1753d), and characterized in that the coil is formed by conductive lines having a constant width. a housing; a conductive pattern (1053a, 1053b, 1053c) that is arranged within the housing and is formed to generate a magnetic field; a plate (402a, 402b) that forms at least a part of a first surface of the housing and includes a material that at least partially transmits the magnetic field generated by the conductive pattern (1053a, 1053b, 1053c); and a communication circuit that is configured to transmit at least one transaction information to an external device by using the conductive pattern (1053a, 1053b, 1053c); and, wherein the conductive pattern (1053a, 1053b, 1053c) includes: a first end electrically connected to the communication circuit; a second end electrically connected to the communication circuit; and a coil that is connected between the first end and the second end and includes a plurality of turns that are substantially parallel to a surface of the plate (402a, 402b); a first end electrically connected to the communication circuit; a second end electrically connected to the communication circuit; and a coil that is connected between the first end and the second end and includes a plurality of turns that are substantially parallel to a surface of the plate (402a, 402b); wherein, when viewed from an upper side of the plate (402a, 402b), the coil includes: a first section (1153d; 1753d) that includes portions of the conductive lines forming the plurality of turns, the conductive lines extending substantially parallel to each other; and a second section (1153e; 1753e) that includes other portions of the conductive lines extending substantially parallel to each other and forming the plurality of turns, a first section (1153d; 1753d) that includes portions of the conductive lines forming the plurality of turns, the conductive lines extending substantially parallel to each other; and a second section (1153e; 1753e) that includes other portions of the conductive lines extending substantially parallel to each other and forming the plurality of turns, wherein the second section (1153e; 1753e) is arranged to enclose a periphery of the first section (1153d; 1753d); and wherein in the first section (1153d; 1753d), a spacing between the portions of the conductive lines is less than a spacing between the other portions of the conductive lines in the second section (1153e; 1753e) such that the second section (1153d; 1753e) includes less conductive line portions per unit area than the first section (1153e; 1753d), and characterized in that the coil is formed by conductive lines having a constant width.