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 display;
a circuit board;
a first element without power feeding that is made of metal;
a second element which includes an antenna electrode connected to a ground of the circuit board and a power supply,
wherein the first element is disposed above the circuit board along an axis perpendicular to a planar surface of the display where the display and the circuit board overlap, and the second element is disposed above the circuit board and below the first element along the axis, and
wherein the second element is an inverted F antenna.
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 the circuit board includes a signal pattern and a GND pattern, and
wherein the power supply is connected to the signal pattern, and the antenna electrode is connected to the GND pattern.
4. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of the electric wave received from a satellite, an equivalent electrical length of the second element is shorter than λ/4.
5. The electronic apparatus according to claim 1 , wherein the first element is an annular shape.
6. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of the electric wave received from a satellite, an equivalent electrical length after the first element and the second element are electromagnetically coupled is λ/4, or an integer multiple of λ/4.
7. 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 axis where the display and the circuit board overlap.
8. 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.
9. The electronic apparatus according to claim 1 ,
wherein when H 1 is a distance between the circuit board and the first element along the axis,
4.0 mm≦ H 1≦8.0 mm
is satisfied.
10. The electronic apparatus according to claim 1 ,
wherein when λ is a wavelength of the electric wave received from a satellite, an equivalent electrical length of the second element is λ/4×about 0.7.
11. The electronic apparatus according to claim 1 ,
wherein the first element is a bezel or a ring-shaped dial ring.
12. The electronic apparatus according to claim 1 ,
wherein the second element receives microwaves from 300 MHz to 3 THz.
13. The electronic apparatus according to claim 1 ,
wherein the second element is a circular arc shape.
14. The electronic apparatus according to claim 1 ,
wherein the first element is an annular shape, a circular arc shape, or a rectangular frame shape.
15. The electronic apparatus according to claim 1 ,
wherein the display is a digital-type or a pointer-type.
16. An electronic apparatus comprising:
a case body;
a bezel made of metal without power feeding is attached to the surface side of the case body;
a display;
a circuit board;
a receiver mounted on the circuit board;
an inverted F antenna mounted on the circuit board and connected to the receiver,
wherein the inverted F antenna includes an antenna electrode connected to a ground of the circuit board and a power supply, and
the bezel is disposed above the circuit board along an axis perpendicular to a planar surface of the display where the display and the circuit board overlap, and the inverted F antenna is below the bezel along the axis.
17. The electronic apparatus according to claim 16 ,
wherein the bezel and the inverted F antenna are electromagnetically coupled.
18. The electronic apparatus according to claim 16 ,
wherein the circuit board includes a signal pattern and a GND pattern, and
wherein the power supply is connected to the signal pattern, and the antenna electrode is connected to the GND pattern.
19. The electronic apparatus according to claim 16 ,
wherein the bezel is an annular shape.
20. The electronic apparatus according to claim 16 ,
wherein when λ is a wavelength of the electric wave received from a satellite, an equivalent electrical length after the bezel and the inverted F antenna are electromagnetically coupled is λ/4, or an integer multiple of λ/4.
21. The electronic apparatus according to claim 16 ,
wherein the bezel and the inverted F antenna are disposed so as to overlap each other along the axis where the display and the circuit board overlap.
22. The electronic apparatus according to claim 16 ,
wherein when d is a distance between the bezel and the inverted F antenna along the axis,
0.5 mm≦ d ≦2.0 mm
is satisfied.
23. The electronic apparatus according to claim 16 ,
wherein when H 1 is a distance between the circuit board and the bezel along the axis,
4.0 mm≦ H 1≦8.0 mm
is satisfied.
24. The electronic apparatus according to claim 16 ,
wherein when λ is a wavelength of the electric wave received from a satellite, an equivalent electrical length of the inverted F antenna is λ/4×about 0.7.
25. The electronic apparatus according to claim 16 ,
wherein the inverted F antenna is a circular arc shape.
26. The electronic apparatus according to claim 16 ,
wherein the bezel is an annular shape, a circular arc shape, or a rectangular frame shape.