Receiving antenna coil

1. A receiving antenna coil, comprising:

a core including an X-axis winding core part extending in an X-axis direction and a Y-axis winding core part extending in a Y-axis direction crossing said X-axis direction;

an X-axis receiving coil wound around said X-axis winding core part and a Y-axis receiving coil wound around said Y-axis winding core part; and

a Z-axis receiving coil wound in a Z-axis direction crossing both said X-axis direction and said Y-axis direction so as to surround said X-axis winding core part and said Y-axis winding core part,

wherein said X-axis winding core part and said Y-axis winding core part each comprises a magnetic material and are provided in a same plane, and said X-axis winding core part comprises one or more bars provided in a plurality of places in said Y-axis direction, and said Y-axis winding core part comprises one or more bars provided in a plurality of places in said X-axis direction, and

wherein said X-axis winding core part and said Y-axis winding core part form a closed rectangular loop shape or an H-letter shape in an XY plane.

2. The receiving antenna coil according to claim 1 , wherein said X-axis receiving coil or said Y-axis receiving coil is wound around said X-axis winding core part or said Y-axis winding core part made in said plurality of bars, and

wherein said X-axis receiving coils or said Y-axis receiving coils wound around said plurality of bars are connected to each other in a direction of adding currents excited by an external magnetic field.

3. The receiving antenna coil according to claim 1 , wherein said core is constructed by combining an X-axis core including said X-axis winding core part and a Y-axis core including said Y-axis winding core part, and

wherein at least one of said X-axis core and said Y-axis core comprises an engagement part for making said X-axis core and said Y-axis core fit each other.

4. The receiving antenna coil according to claim 3 , wherein said core is constructed by combining a plurality of said X-axis cores or said Y-axis cores, and

wherein said X-axis core comprises one bar of said X-axis winding core part, or said Y-axis core comprises one bar of said Y-axis winding core part.

5. The receiving antenna coil according to claim 3 , wherein a peripheral length of said engagement part is longer than peripheral lengths of each of said X-axis winding core part and said y-axis winding core part, and

wherein said engagement part comprises a flange that prevents loosening of said X-axis receiving coil or said Y-axis receiving coil.

6. The receiving antenna coil according to claim 3 , wherein said engagement part comprises a resin material, said X-axis winding core part and said Y-axis winding core part comprising a ferrite material, and

wherein said X-axis core or said Y-axis core comprising said engagement part is constructed by combining the engagement part and said X-axis winding core part or said Y-axis winding core part attached to the engagement part.

7. The receiving antenna coil according to claim 6 , wherein each of said X-axis core and said Y-axis core comprises said engagement part, and

wherein said engagement part of said X-axis core and said engagement part of said Y-axis core comprise a same shape.

8. The receiving antenna coil according to claim 1 , further comprising a Z-axis core comprising a nonmagnetic material, around which said Z-axis receiving coil is to be wound.

9. The receiving antenna coil according to claim 8 , wherein said Z-axis core comprises a tube shape, and said core is housed in said Z-axis core.

10. The receiving antenna coil according to claim 1 , wherein said one or more bars of said X-axis winding core part extending in said X-axis direction are formed in parallel.

11. The receiving antenna coil according to claim 10 , wherein intermediate parts in the longitudinal direction of said one or more bars of said X-axis winding core part are connected to each other via said Y-axis winding core part extending in said Y-axis direction.

12. A receiving antenna coil, comprising:

a core including an X-axis winding core part comprising a magnetic material extending in an X-axis direction and a Y-axis winding core part comprising a magnetic material extending in a Y-axis direction crossing said X-axis direction;

an X-axis receiving coil wound around said X-axis winding core part and a Y-axis receiving coil wound around said Y-axis winding core part; and

a Z-axis receiving coil wound in a Z-axis direction crossing both said X-axis direction and said Y-axis direction so as to surround said X-axis winding core part and said Y-axis winding core part,

wherein said X-axis winding core part and said Y-axis winding core part are respectively formed in a plurality of bars,

wherein said core is constructed by combining an X-axis core including said X-axis winding core part and a Y-axis core including said Y-axis winding core part, and

wherein said X-axis core and said Y-axis core are provided in a same plane and form an open rectangular loop shape, and

wherein at least one of said X-axis core and said Y-axis core comprises an engagement part for making said X-axis core and said Y-axis core fit each other.

13. A receiving antenna coil, comprising:

a core being configured in a square shape, said square shape being orientated in a plane along an X-axis direction and a Y-axis direction, said core comprising:

a first flange provided in a first corner of the square shape;

a second flange provided in a second corner of the square shape;

a third flange provided in a third corner of the square shape;

a fourth flange provided in a fourth corner of the square shape;

a first rod provided between the first flange and the second flange;

a second rod provided between the second flange and the third flange;

a third rod provided between the third flange and the fourth flange;

a fourth rod provided between the first flange and the fourth flange;

a first X-axis receiving coil wound around the first rod;

a second X-axis receiving coil wound around the third rod, said first X-axis receiving coil and said second X-axis receiving coil being electrically connected;

a first Y-axis receiving coil wound around the second rod;

a second Y-axis receiving coil wound around the fourth rod, the first Y-axis receiving coil and the second Y-axis receiving coil being electrically connected; and

a Z-axis receiving coil wound in a Z-axis direction crossing both the X-axis direction and the Y-axis direction so as to surround said X first rod, second rod, third rod, and fourth rod,

wherein each of said first rod, said second rod, said third rod, and said fourth rod comprise a magnetic material and is provided in the plane along the X-axis direction and the Y-axis direction.

14. The receiving antenna coil according to claim 13 , wherein each of said first rod, said second rod, said third rod, and said fourth rod comprises a corner-rounded rectangular shape in a direction perpendicular to a winding direction of a respective one of the first X-axis receiving coil, the second X-axis receiving coil, the first Y-axis receiving coil, and the second Y-axis receiving coil.

15. The receiving antenna coil according to claim 14 , wherein the corner-rounded rectangular shape includes a long side in a plane along the X-axis direction and the Y-axis direction, and a short side along a Z-axis plane.

16. The receiving antenna coil according to claim 13 , wherein the Z-axis receiving coil comprises a rectangular tube shape.

17. The receiving antenna coil according to claim 13 , wherein a winding length of the Z-axis receiving coil is equal to a thickness dimension of the core.

18. The receiving antenna coil according to claim 13 , wherein the Z-axis receiving coil comprises a non-magnetic material.

19. The receiving antenna coil according to claim 13 , wherein the core is housed within the Z-axis receiving coil.