Antenna device for high-frequency radio apparatus,high-frequency radio apparatus,and wrist watch-type radio apparatus

• US 20020163473A1
• Filed: 11/27/2001
• Published: 11/07/2002
• Est. Priority Date: 03/29/2000
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Koyama, Shunsuke, Fujisawa, Teruhiko
• Granted Patent: US 6,762,728 B2
• Time in Patent Office: Days
• US Class Current: 343/718
• CPC Class Codes: G04G 21/04 using radio waves radio-controlled time-pieces G04R
• CPC Class Codes: G04R 60/10 inside cases
• CPC Class Codes: H01Q 1/273 Adaptation for carrying or wearing by persons or animals
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An antenna device for a high frequency radio apparatus is equipped with an antenna element which is placed on a circuit board whose peripheral shape has a curve. The antenna element also follows the peripheral shape of the circuit board to have a curved part when viewed from above. The antenna device also has a ground pattern where the antenna element touches. The ground pattern can be placed at a constant distance from the antenna element toward the board. Furthermore, the ground pattern can be formed on almost the entire area of the circuit board other than where the antenna element is formed. Also, the circuit board may be a multilayer circuit board, and the ground pattern can be formed almost on the entire area of any one layer of the multilayer circuit board other than where the antenna element is formed.

Claims

1. An antenna device for a high frequency radio apparatus comprising:

an antenna element placed on a circuit board whose peripheral shape has a curve, the antenna element following the peripheral shape of the circuit board to have a curved part when viewed from above, and

a ground pattern which is connected with the antenna element.

2. An antenna device for a high frequency radio apparatus of claim 1:

wherein the ground pattern is placed at a constant distance from the antenna element toward the board.

3. An antenna device for a high frequency radio apparatus of claim 2:

wherein the ground pattern is formed on almost the entire area of the circuit board other than where the antenna element is formed.

4. An antenna device for a high frequency radio apparatus of claim 1:

wherein the circuit board is a multilayer circuit board, and

the ground pattern is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed.

5. An antenna device for a high frequency radio apparatus of claim 1:

wherein, at the connecting point where the element is connected with the ground pattern, a direction along the extension of the element near where the antenna element is connected with the ground pattern and a direction of a tangent line at the connecting point of the ground pattern cross approximately at right angles.

6. An antenna device for a high frequency radio apparatus of claim 1:

wherein, when the curved part viewed from above is regarded nearly as an arc, an angle between a straight line which goes through a connecting point where the antenna element is connected with the ground pattern and a circle center of the arc and a straight line which goes through a tip of the antenna element and the circle center of the arc is below or equal to 180[°

].

9. An antenna device for a high frequency radio apparatus of claim 1:

wherein the antenna element is an inverted-F antenna, and an element length is approximately a quarter wave length of a designated radio frequency.

7. An antenna device for a high frequency radio apparatus comprising:

a multilayer circuit board;

an antenna element placed on the multilayer circuit board; and

a ground pattern which is connected with the antenna element and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed.

8. An antenna device for a high frequency radio apparatus comprising:

a multilayer circuit board;

an antenna element which is placed on the multilayer circuit board;

a first ground pattern which is placed at a constant distance from the antenna element toward the antenna element on the multilayer circuit board and is connected with the antenna element, and

a second ground pattern which is electrically connected with the first ground pattern and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed.

10. A high frequency radio apparatus comprising:

an antenna part for the high frequency radio apparatus that comprises;

an antenna element placed on a circuit board whose peripheral shape has curves, the antenna element following the peripheral shape of the circuit board to have a curved shape when viewed from above, and

a ground pattern connected with the antenna element, and

a radio communication part that performs radio communication through the antenna part of the high frequency radio apparatus.

11. A high frequency radio apparatus of claim 10:

wherein the ground pattern is placed at a constant distance from the antenna element toward the circuit board.

12. A high frequency radio apparatus of claim 11:

wherein the ground pattern is formed on almost the entire area of the circuit board other than where the antenna element is formed.

13. A high frequency radio apparatus of claim 10:

wherein the circuit board is a multilayer circuit board, and

the ground pattern is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed.

15. A radio apparatus of claim 10 or claim 14:

wherein, the radio communication part comprises a plurality of elements including a power supply, and

any element among the plurality of elements that affects the characteristics of the antenna part for the high frequency radio apparatus by being placed near the antenna part for the high frequency radio apparatus is so placed that orthogonal projection of the external shape of the element is cast within the ground pattern when the ground pattern is assumed to be a projecting plane and the element is seen from above.

23. A wrist watch-type high frequency radio apparatus of claim 18 or claim 22:

wherein, the radio communication part comprises a plurality of elements including a power supply, and

any element among the plurality of elements that affects the characteristics of the antenna part for the high frequency radio apparatus by being placed near the antenna part for the high frequency radio apparatus is so placed that orthogonal projection of the external shape of the element is cast within the ground pattern when the ground pattern is assumed to be a projecting plane and the element is seen from above.

14. A high frequency radio apparatus comprising:

an antenna part for the high frequency radio apparatus having a multilayer circuit board, an antenna element which is placed on the multilayer circuit board, and a ground pattern which is connected with the antenna element and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed, and

a radio communication part where radio communication takes place through the antenna part for the high frequency radio apparatus.

16. A high frequency radio apparatus comprising:

an antenna part for a high frequency radio apparatus which comprises

a multilayer circuit board,

a first ground pattern which is connected with the antenna element, and

a second ground pattern which is electrically connected with the first ground pattern and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed, and

a radio communication part which performs radio communication via the antenna part for the high frequency radio apparatus.

17. A high frequency radio apparatus of claim 16:

wherein, the radio communication part comprises a plurality of elements including a power supply, and

any element among the plurality of elements that affects the characteristics of the antenna part for the high frequency radio apparatus by being placed near the antenna part for the high frequency radio apparatus is so placed that orthogonal projection of the external shape of the element is cast within the second ground pattern when the second ground pattern is assumed to be a projecting plane and the element is seen from above.

18. A wrist watch-type high frequency radio apparatus comprising:

an antenna part for the high frequency radio apparatus that comprises;

an antenna element placed on a circuit board whose peripheral shape has curves, the antenna element following the peripheral shape of the circuit board to have a curved shape when viewed from above, and

a ground pattern connected with the antenna element,

a radio communication part that performs radio communication through the antenna part for the high frequency radio apparatus, and

a wrist watch-type case in which the antenna part for the high frequency radio apparatus and the radio communication part are stored.

19. A wrist watch-type high frequency radio apparatus of claim 18:

wherein the ground pattern is placed at a constant distance from the antenna element toward the board.

20. A wrist watch-type high frequency radio apparatus of claim 19:

wherein the ground pattern is formed on almost the entire area of the circuit board other than where the antenna element is formed.

21. A wrist watch-type high frequency radio apparatus of claim 18:

wherein the circuit board is a multilayer circuit board, and

the ground pattern is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed.

22. A wrist watch-type high frequency radio apparatus comprising:

an antenna part for a high frequency radio apparatus comprising;

a multilayer circuit board,

an antenna element which is placed on the multilayer circuit board, and

a ground pattern which is connected with the antenna element and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed;

a radio communication part that performs radio communication through the antenna part for the high frequency radio apparatus, and

a wrist watch-type case in which the antenna part for the high frequency radio apparatus and the radio communication part are stored.

24. A wrist watch-type high frequency radio apparatus comprising:

an antenna part for the high frequency radio apparatus that comprises;

a multilayer circuit board,

an antenna element which is placed on the multilayer circuit board,

a first ground pattern which is connected with the antenna element and is placed on the multilayer circuit board at a constant distance from the antenna element toward the board, and

a second ground pattern which is electrically connected with the first ground pattern and is formed on almost the entire area of any one internal layer of the multilayer circuit board other than the corresponding area where the antenna element is formed;

a radio communication part that performs radio communication through the antenna part for the high frequency radio apparatus, and

a wrist watch-type case in which the antenna part for high frequency radio apparatus and the radio communication part are stored.

25. A wrist watch-type high frequency radio apparatus of claim 24:

wherein,

the radio communication part comprises a plurality of elements including a power supply, and

any element among the plurality of elements that affects the characteristics of the antenna part for the high frequency radio apparatus by being placed near the antenna part for the high frequency radio apparatus is so placed that orthogonal projection of the external shape of the element is cast within the second ground pattern when the second ground pattern is assumed to be a projecting plane and the element is seen from above.