Antenna device and electronic apparatus including antenna device
An antenna device includes a casing including a metal casing portion and a feed coil. The metal casing portion includes a main surface, a side surface connected to the main surfaces, and a notch portion located in the side surface. The feed coil is disposed inside the casing to be coupled with the metal casing portion by a magnetic field, and includes a winding central portion forming a coil opening portion. The feed coil is disposed near the notch portion, with the coil opening portion directed to a region including the notch portion.
1. An antenna device comprising:
a casing including a metal casing portion including a main surface, a side surface connected to the main surface, and a notch portion, the main surface having an area greater than an area of the side surface, and at least a portion of the notch portion being located in the side surface; and
a feed coil disposed inside the casing and configured to be coupled with the metal casing portion by a magnetic field, and including a winding central portion defining a coil opening portion; wherein
the feed coil is disposed adjacent to or near the notch portion and at least a portion of the coil opening portion is directed toward a region including at least the portion of the notch portion located in the side surface.
2. The antenna device according to claim 1 , wherein
the notch portion includes an opening portion and a slit portion connecting the opening portion and an outer edge of the metal casing portion; and
the coil opening portion overlaps the opening portion, as viewed in a direction perpendicular to the side surface.
3. The antenna device according to claim 2 , wherein the opening portion extends to the main surface.
4. The antenna device according to claim 2 , wherein the opening portion is in contact with a boundary between the main surface and the side surface.
5. The antenna device according to claim 1 , wherein the feed coil includes a portion located adjacent to or near the main surface.
6. The antenna device according to claim 1 , wherein a width of the opening portion is greater than a width of the slit portion.
7. The antenna device according to claim 1 , wherein a first portion of the feed coil is located near or adjacent to the side surface and a second portion of the feed coil is located near or adjacent to the main surface.
8. The electronic apparatus according to claim 7 , wherein the electronic apparatus is one of a computer and a tablet terminal.
9. The electronic apparatus according to claim 7 , wherein
the notch portion includes an opening portion and a slit portion connecting the opening portion and an outer edge of the metal casing portion; and
the coil opening portion overlaps the opening portion, as viewed in a direction perpendicular to the side surface.
10. The electronic apparatus according to claim 9 , wherein the opening portion extends to the main surface.
11. The electronic apparatus according to claim 9 , wherein the opening portion is in contact with a boundary between the main surface and the side surface.
12. The electronic apparatus according to claim 7 , wherein the feed coil includes a portion located adjacent to or near the main surface.
13. The electronic apparatus according to claim 7 , wherein a width of the opening portion is greater than a width of the slit portion.
14. The electronic apparatus according to claim 7 , wherein a first portion of the feed coil is located near or adjacent to the side surface and a second portion of the feed coil is located near or adjacent to the main surface.
15. The electronic apparatus according to claim 7 , wherein the feed coil is a chip coil including a coil conductor arranged around a magnetic material.
16. The antenna device according to claim 1 , wherein the feed coil is a chip coil including a coil conductor arranged around a magnetic material.
17. An electronic apparatus comprising:
the antenna device according to claim 1 ; and
a circuit board provided inside the casing; wherein
the circuit board includes a feed circuit connected to the feed coil.
18. The electronic apparatus according to claim 17 , further comprising an operation unit or an interface unit disposed in the notch portion.
19. The electronic apparatus according to claim 18 , wherein the operation unit is one of a camera switch, a main power switch and a volume control switch.
20. The electronic apparatus according to claim 18 , wherein the interface unit is one of an input/output terminal, an earphone jack terminal and an insert slot for a memory card.