Antenna, antenna apparatus, and communication apparatus

1. An antenna comprising:

a magnetic core;

a coil winding section in which a conducting wire is wound around the magnetic core; and

an adjustment section connected to one end of the coil winding section, wherein:

the adjustment section includes a plurality of adjustable conducting wires formed by dividing the conducting wire that is connected to the coil winding section, along with a longitudinal direction of the adjustment section, at an end portion of the magnetic core;

the plurality of adjustable conducting wires are connected with each other at both ends of the adjustable conducting wires;

a first adjustable conducting wire that is located nearest to the coil winding section, of the plurality of adjustable conducting wires, is connected to an end of the conducting wire without via a cutting point; and

an adjustable conducting wire other than the first adjustable conducting wire is connected to the end of the conducting wire via the cutting point.

2. The antenna according to claim 1 , wherein an inductance is adjusted by cutting only any one of cutting points.

3. The antenna according to claim 1 , wherein the cutting point is located such that the cutting point does not overlap with the magnetic core.

4. The antenna according to claim 1 , wherein a longitudinal direction of the adjustment section is substantially perpendicular to a winding axis of the coil winding section.

5. The antenna according to claim 1 , wherein the plurality of adjustable conducting wires and the conducting wire of the coil winding section are substantially in parallel with each other.

6. The antenna according to claim 1 , wherein among the plurality of adjustable conducting wires in the adjustment section, an adjustable conducting wire closest to the coil winding section is thicker than another adjustable conducting wire.

7. The antenna according to claim 6 , wherein a width of the adjustable conducting wire closest to the coil winding section is identical with a width of the conducting wire of the coil winding section.

8. The antenna according to claim 1 , wherein a space between the conducting wires in the coil winding section is larger than a space between the conducting wires in the adjustment section.

9. The antenna according to claim 1 , wherein the magnetic core is plate-shaped and provided with the coil winding section on both surfaces of the magnetic core.

10. The antenna according to claim 1 , wherein:

the coil winding section comprises a first flexible substrate and a second flexible substrate on each of which a conducting wire is formed, and the coil winding section is funned by connecting the conducting wires with each other; and

the first flexible substrate and the second flexible substrate hold the magnetic core in between in such a way as to cover the magnetic core.

11. An antenna apparatus comprising:

a metal body; and

the antenna according to claim 1 ,

wherein the antenna and the metal body are adjacently disposed in a state of being in contact with each other or not being in contact with each other.

12. The antenna apparatus according to claim 11 , wherein at least part of the antenna faces the metal body.

13. The antenna apparatus according to claim 11 , wherein:

at least part of the coil winding section faces the metal body; and

at least part of the adjustment section does not face the metal body.

14. The antenna apparatus according to claim 11 , wherein an opening of the coil winding section is perpendicular to a region of the metal body that faces the antenna.

15. A communication apparatus comprising the antenna apparatus according to claim 11 .