Electronic watch
An electronic watch includes an annular antenna base material including an upper surface, an outer circumferential surface, a bottom surface, and an inner circumferential surface, a first antenna element provided at the outer circumferential surface, and a second antenna element provided at the inner circumferential surface, wherein at least one of the first antenna element and the second antenna element includes a feed terminal coupled to a feed portion, and a distance between the first antenna element and the second antenna element is greater than 0 mm and less than or equal to 2 mm.
1. An electronic watch comprising:
an annular antenna base material including an upper surface, an outer circumferential surface, a bottom surface, and an inner circumferential surface;
a first antenna element provided at the outer circumferential surface; and
a second antenna element provided at the inner circumferential surface, wherein
at least one of the first antenna element and the second antenna element includes a feed terminal coupled to a feed portion, and
a distance between the first antenna element and the second antenna element is greater than 0 mm and less than or equal to 2 mm.
2. The electronic watch according to claim 1 , wherein
the distance between the first antenna element and the second antenna element is greater than 0 mm and less than or equal to 1.5 mm.
3. The electronic watch according to claim 1 , wherein
a width of the first antenna element and the second antenna element is 0.5 mm or greater, and is less than or equal to a height of the outer circumferential surface and the inner circumferential surface.
4. The electronic watch according to claim 1 , wherein
the inner circumferential surface includes a first inner circumferential surface provided continuously with the upper surface and a second inner circumferential surface provided between the first inner circumferential surface and the bottom surface,
the first inner circumferential surface is inclined in a direction so that a lower end thereof is closer to a central axis of the antenna base material than an upper end thereof is, the lower end being continuous with the second inner circumferential surface, the upper end being continuous with the upper surface, and
the second antenna element is provided continuously at the first inner circumferential surface and the second inner circumferential surface.
5. The electronic watch according to claim 1 , wherein
a height dimension of the antenna base material is greater than or equal to a width dimension of the antenna base material.
6. The electronic watch according to claim 1 , wherein
a material of the antenna base material is any of polyphenylene sulfide, liquid crystal polymer, or polycarbonate, and
the first antenna element and the second antenna element are formed by plating.
7. The electronic watch according to claim 1 , comprising a dial disposed inside the antenna base material, wherein
a concave portion, at which a fixing convex portion of the dial is to be disposed, is formed at the inner circumferential surface.
8. The electronic watch according to claim 1 , wherein
the antenna base material has a relative permittivity of 7 or greater.
9. The electronic watch according to claim 1 , comprising a bezel disposed outside the antenna base material, wherein
at least a portion of the bezel is formed of an electrically conductive material.
10. The electronic watch according to claim 1 , wherein
the antenna base material is covered by a dial ring made of synthetic resin.