Electronic apparatus
An electronic apparatus includes a display; and an antenna including a first element without power feeding that is a structural component made of metal and is disposed on the display or above a display surface of the display in a display direction, a second element which is disposed below the first element and is connected to a power supply, and a GND plate that is disposed below the second element, wherein the first element and the second element are electromagnetically coupled.
1. An electronic apparatus comprising:
a case having an interior space formed by a case body, a back cover, and a glass, wherein the case is configured to be worn on a body of a user;
a display disposed in the interior space;
a first element made of metal and disposed outside the interior space;
a circuit board disposed in the interior space, the circuit board including a ground pattern and a signal pattern; and
a second element disposed in the interior space, the second element including:
an antenna electrode arranged proximate to a first end of the second element, and electrically connected to the ground pattern; and
a power supply electrode electrically connected to the signal pattern of the circuit board,
wherein in a plan view along a direction perpendicular to an axis from the second element to the first element, the first element is disposed above the circuit board and the display, and the second element is disposed above the circuit board and below the first element.
2. The electronic apparatus according to claim 1 ,
wherein the first element and the second element are electromagnetically coupled without a radiation element between the first element and the second element.
3. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of an electric wave received from a satellite, an equivalent electrical length of the second element is shorter than λ/4.
4. The electronic apparatus according to claim 1 ,
wherein the first element has an annular shape.
5. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of an electric wave received from a satellite, an equivalent electrical length with the first element and the second element being electromagnetically coupled is λ/4, or an integer multiple of λ/4.
6. The electronic apparatus according to claim 1 ,
wherein the first element and the second element are disposed so as to overlap each other along the direction.
7. The electronic apparatus according to claim 1 ,
wherein when d is a distance between the first element and the second element,
0.5 mm≤d≤2.0 mm is satisfied.
8. The electronic apparatus according to claim 1 ,
wherein when H 1 is a distance between the circuit board and the first element along the direction,
4.0 mm≤H1≤8.0 mm is satisfied.
9. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of an electric wave received from a satellite, an equivalent electrical length of the second element is λ/4× about 0.7.
10. The electronic apparatus according to claim 1 ,
wherein the first element is a bezel or a ring-shaped dial ring.
11. The electronic apparatus according to claim 1 ,
wherein the second element is configured to receive microwaves from 300 MHz to 3 THz.
12. The electronic apparatus according to claim 1 ,
wherein the second element has a circular arc shape.
13. The electronic apparatus according to claim 1 ,
wherein the first element has an annular shape, a circular arc shape, or a rectangular frame shape.
14. The electronic apparatus according to claim 1 ,
wherein the display is a digital-type or a pointer-type display.
15. The electronic apparatus according to claim 1 ,
wherein the case body and the back cover are integrally formed.
16. The electronic apparatus according to claim 1 ,
wherein the second element is disposed on a side of the display in a plan view along a normal direction of the display.