Near-field antenna apparatus using eddy current and electronic device including the same
A near-field antenna apparatus including an antenna element around which a coil is wound configured to create a magnetic field; and a conductive material member, disposed in a path of the magnetic field, configured to generate an eddy current from a magnetic flux in a predetermined region.
1. A near-field antenna apparatus comprising:
an antenna element configured to output a magnetic field generated by a coil wound around the antenna element;
a first conductive material member; and
a second conductive material member disposed on an opposite side of an axis of the coil from the first conductive material member,
wherein each of the first conductive material member and the second conductive material member is substantially parallel to the axis of the coil, disposed in a path of the magnetic field to receive the magnetic field in a first direction, and configured to output, in a second direction, a magnetic field generated by an eddy current induced therein by the magnetic field received in the first direction, and
the first conductive material member and the second conductive material member are substantially non-overlapping.
2. The near-field antenna apparatus of claim 1 , wherein the antenna element is mounted on a printed circuit board,
the first conductive material member is a metal surface of a component mounted on the printed circuit board, and
the second conductive material member is a metal case.
3. The near-field antenna apparatus of claim 1 , wherein the antenna element is mounted on a printed circuit board,
the first conductive material member is a metal surface of a back cover in which the antenna element is disposed, and
the second conductive material member is a metal surface in the printed circuit board.
4. The near-field antenna apparatus of claim 1 , wherein the first direction in which the magnetic field is received by the first conductive material member and the second conductive material member is perpendicular to a curl up direction of the coil.
5. The near-field antenna apparatus of claim 1 , wherein the antenna element is a first antenna element configured to output a first magnetic field generated by a first coil wound around the first antenna element,
the near-field antenna apparatus further comprises a second antenna element configured to output a second magnetic field generated by a second coil wound around the second antenna element, and
the first conductive material member and the second conductive material member are disposed in a path of the first magnetic field output from the first antenna element and a path of the second magnetic field output from the second antenna element.
6. The near-field antenna apparatus of claim 5 , wherein a direction in which the second antenna element outputs the second magnetic field and a direction in which the first antenna element outputs the first magnetic are perpendicular to each other, and to the second direction in which the magnetic field is output from the first conductive material member and the second direction in which the magnetic field is output from the second conductive material member.
7. The near-field antenna apparatus of claim 1 , wherein the second direction in which the magnetic field is output from the first conductive material member is the same as the second direction in which the magnetic field is output from the second conductive material member.
8. An electronic device comprising:
an antenna element configured to output a magnetic field generated by a coil wound around the antenna element;
a first conductive material member; and
a second conductive material member disposed on an opposite side of an axis of the coil from the first conductive material member,
wherein each of the first conductive material member and the second conductive material member is substantially parallel to the axis of the coil, disposed in a path of the magnetic field to receive the magnetic field in a first direction, and configured to output, in a second direction, a magnetic field generated by an eddy current induced therein by the magnetic field received in the first direction, and
the first conductive material member and the second conductive material member are substantially non-overlapping.
9. The electronic device of claim 8 , further comprising a printed circuit board on which the antenna element is disposed,
wherein the first conductive material member is a metal surface of a back cover, and
the second conductive material member is a metal surface of a component mounted on the printed circuit board.
10. The electronic device of claim 9 , wherein the antenna element is disposed in a rear case between the printed circuit board and the back cover.
11. The electronic device of claim 8 , further comprising a printed circuit board on which the antenna element is disposed,
wherein the first conductive material member is a metal surface in the printed circuit board, and
the second conductive material member is a metal case supporting a display.
12. The electronic device of claim 11 , wherein the antenna element is disposed in a bracket disposed between the printed circuit board and the metal case.
13. The electronic device of claim 8 , wherein either one or both of the first conductive material member and the second conductive material member is realized by any one or any combination of a battery, a camera module, and a semiconductor package.
14. The electronic device of claim 8 , further comprising a secondary coil disposed at a position enabling a current to be induced in the secondary coil by the magnetic field output from the antenna element and the magnetic field output from each of the first conductive material member and the second conductive material member.