High frequency wave glass antenna for an automobile

• US 7,425,926 B2
• Filed: 07/20/2005
• Issued: 09/16/2008
• Est. Priority Date: 07/21/2004
• Status: Expired due to Fees

• Current Assignee: AGC, Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Funatsu, Toshifumi
• Primary Examiner(s): MANCUSO, HUEDUNG XUAN CAO
• Application Number:
  US11/184,919
• Publication Number:
  US 20060017632A1
• Time in Patent Office: 1,154 Days
• Field of Search: 343712-713, 343/714, 343/711, 343/704
• US Class Current: 343/713
• CPC Class Codes: H01Q 1/1285 with capacitive feeding through the windscreen

Abstract

In a high frequency wave glass antenna for an automobile, wherein an antenna conductor and an antenna-conductor-side feeding electrode connected to the antenna conductor are provided to a laminated glass sheet for an automobile, the laminated glass sheet comprising two glass sheets bonded through a bonding layer, and wherein a receiver-side feeding electrode is disposed at a position to confront the antenna-conductor-side feeding electrode and on a car-interior-side surface of the laminated glass; each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 140 to 2,500 mm².

Claims

1. A high frequency wave glass antenna for an automobile, comprising:

two glass sheets, the glass sheets being bonded through a bonding layer to form a laminated glass sheet for an automobile;

an antenna conductor;

an antenna-conductor-side feeding electrode connected to the antenna conductor;

the antenna conductor and the antenna-conductor-side feeding electrode being disposed between the two glass sheets; and

a receiver-side feeding electrode disposed at a position to confront the antenna-conductor-side feeding electrode and on a car-interior-side surface of the laminated glass;

wherein the antenna conductor is configured to receive at least one of a digital television broadcasting frequency band and a UHF television broadcasting frequency band;

wherein each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 49 to 2,500 mm²; and

wherein a distance between the antennas-conductor-side feeding electrode and the receiver-side feeding electrode is set so that both electrodes form at least one of electromagnetic coupling and capacitive coupling; and

wherein a received signal excited in the antenna conductor is transmitted through the antenna-conductor-side feeding electrode to the receiver-side feeding electrode.

2. The glass antenna according to claim 1, wherein each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 140 to 2,500 mm².

3. The glass antenna according to claim 1, wherein the area of the antenna-conductor-side feeding electrode is from 0.5 to 1.5 times that of the receiver-side feeding electrode.

4. The glass antenna according to claim 1, wherein the laminated glass sheet comprises a car-interior-side glass sheet and a car-exterior-side glass sheet;

and

wherein the antenna-conductor-side feeding electrode and the receiver-side feeding electrode have the car-interior-side glass sheet interposed therebetween.

5. The glass antenna according to claim 1, wherein the laminated glass sheet comprises a car-interior-side glass sheet and a car-exterior-side glass sheet;

and

wherein the antenna-conductor-side feeding electrode and the receiver-side feeding electrode have the car-interior-side glass sheet and an interlayer film interposed therebetween, the interlayer film comprising a synthetic resin film.

6. The glass antenna according to claim 1, wherein the laminated glass sheet comprises a car-interior-side glass sheet, a car-exterior-side glass sheet and an interlayer film, the interlayer film being interposed between the car-interior-side glass sheet and the car-exterior-side glass sheet, the interlayer film comprising a synthetic resin film;

and

wherein the antenna-conductor-side feeding electrode is disposed on a surface of the car-interior-side glass sheet close to the interlayer film or on a surface of the car-exterior-side glass sheet close to the interlayer film.

7. The glass antenna according to claim 1, wherein the laminated glass sheet has a shielding layer disposed on the car-interior-side surface;

and wherein the receiver-side feeding electrode is disposed on the shielding layer.

8. The glass antenna according to claim 1, wherein at least one of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is formed in a square shape, a substantially square shape, a circular shape, a substantially circular shape, an oval shape or a substantially oval shape.

9. The glass antenna according to claim 1, wherein a received carrier wave contains a frequency of from 470 to 704 MHz.

10. The glass antenna according to claim 1, wherein a received carrier wave contains a frequency of from 473 to 767 MHz.

11. The glass antenna according to claim 1, wherein a received carrier wave contains a frequency of from 450 to 750 MHz.

12. The glass antenna according to claim 1, wherein a received carrier wave contains a frequency of from 698 to 806 MHz.

13. A laminated glass sheet of an automobile, including two glass sheets, the glass sheets being bonded through a bonding layer to form the laminated glass sheet for an automobile, and the antenna conductor, and the antenna-conductor-side feeding electrode and the receiver-side feeding electrode defined in claim 1.

21. A laminated glass sheet of an automobile, including two glass sheets, the glass sheets being bonded through a bonding layer to form the laminated glass sheet for an automobile, and the antenna conductor, the antenna-conductor-side feeding electrode and the receiver-side feeding electrode defined in claim 6.

14. A high frequency wave glass antenna for an automobile, comprising:

two glass sheets, the glass sheets being bonded through a bonding layer to form a laminated glass sheet for an automobile;

an antenna conductor;

an antenna-conductor-side feeding electrode connected to the antenna conductor;

the antenna conductor and the antenna-conductor-side feeding electrode being disposed between the two glass sheets; and

a receiver-side feeding electrode disposed at a position to confront the antenna-conductor-side feeding electrode and on a car-interior-side surface of the laminated glass;

wherein the antenna conductor is configured to receive at least one of a digital television broadcasting frequency band and a UHF television broadcasting frequency band;

wherein each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 49 to 2,500 mm²;

wherein a shortest distance between the receiver-side feeding electrode and an edge of an opening formed in a car body is from 1.8 to 50.0 mm;

wherein a distance between the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is set so that both electrodes form at least one of electromagnetic coupling and capacitive coupling; and

wherein a received signal excited in the antenna conductor is transmitted through the antenna-conductor-side feeding electrode to the receiver-side feeding electrode.

15. The glass antenna according to claim 14, wherein when each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 49 to 144 mm², the shortest distance between the receiver-side feeding electrode and the edge of the opening formed in the car body is from 1.8 to 28 mm.

16. The glass antenna according to claim 14, wherein a received carrier wave contains a frequency of from 473 to 767 MHz.

17. The glass antenna according to claim 14, wherein a received carrier wave contains a frequency of from 698 to 806 MHz.

18. A high frequency wave glass antenna for an automobile, comprising:

two glass sheets, the glass sheets being bonded through a bonding layer to form a laminated glass sheet for an automobile;

an antenna conductor;

an antenna-conductor-side feeding electrode connected to the antenna conductor;

the antenna conductor and the antenna-conductor-side feeding electrode being disposed between the two glass sheets; and

a receiver-side feeding electrode disposed at a position to confront the antenna-conductor-side feeding electrode and on a car-interior-side surface of the laminated glass;

wherein each of the antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 49 to 2,500 mm²;

wherein a distance between the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is from 1.50 to 6.00 mm; and

wherein the distance between the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is related to a transmission efficiency of a received signal to be transmitted from the antenna-conductor-side feeding electrode to the receiver-side feeding electrode, such that the distance is determined so as to prevent the transmission efficiency from being brought close to a minimum value when the transmission efficiency changes, having the minimum value and a maximum value according to the distance.

19. The glass antenna according to claim 18, wherein the distance between the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is determined so as to satisfy the following formula:

maximum value≧

transmission efficiency≧

(1/3) (2×

maximum value+minimum value).

20. The glass antenna according to claim 18, wherein the distance between the antenna-conductor-side feeding electrode and the receiver-side feeding electrode is from 1.50 to 2.72 mm or from 2.87 to 6.00 mm.

22. A high frequency wave glass antenna for an automobile, comprising:

two glass sheets, the glass sheets being bonded through a bonding layer to form a laminated glass sheet for an automobile;

a first antenna conductor;

a first antenna-conductor-side feeding electrode connected to the first antenna conductor;

the first antenna conductor and the first antenna-conductor-side feeding electrode being disposed between the two glass sheets;

a second antenna conductor;

a second antenna-conductor-side feeding electrode connected to the second antenna conductor;

the second antenna conductor and the second antenna-conductor-side feeding electrode being disposed between the two glass sheets;

a first receiver-side feeding electrode disposed at a position to confront the first antenna-conductor-side feeding electrode and on a car-interior-side surface of the laminated glass; and

a second receiver-side feeding electrode disposed at a position to confront the second antenna-conductor-side feeding electrode and on the car-interior-side surface of the laminated glass;

wherein a distance between the first antenna-conductor-side feeding electrode and the second antenna-conductor-side feeding electrode is from 6 to 100 mm.

23. The glass antenna according to claim 22, wherein each of the first antenna-conductor-side feeding electrode, the second antenna-conductor-side feeding electrode, the first receiver-side feeding electrode and the second receiver-side feeding electrode has an area of from 49 to 2,500 mm².

24. The glass antenna according to claim 22, wherein the laminated glass sheet has a shielding layer disposed on the car-interior-side surface;

and wherein at least one of the first receiver-side feeding electrode and the second receiver-side feeding electrode is disposed on the shielding layer.

25. The glass antenna according to claim 22, wherein at least one selected among the first antenna-conductor-side feeding electrode, the second antenna-conductor-side feeding electrode, the first receiver-side feeding electrode and the second receiver-side feeding electrode is formed in a shape selected among a square shape, a substantially square shape, a circular shape, a substantially circular shape, an oval shape and a substantially oval shape.

26. The glass antenna according to claim 22, wherein a received carrier wave contains a frequency of from 473 to 767 MHz.

27. The glass antenna according to claim 22, wherein a received carrier wave contains a frequency of from 698 to 806 MHz.

28. A high frequency wave glass antenna for an automobile, comprising:

two glass sheets, the glass sheets being bonded through a bonding layer to form a laminated glass sheet for an automobile;

a first antenna conductor;

a first antenna-conductor-side feeding electrode connected to the first antenna conductor;

the first antenna conductor and the first antenna-conductor-side feeding electrode being disposed on a car-interior-side surface of the laminated glass sheet;

a second antenna conductor;

a second antenna-conductor-side feeding electrode connected to the second antenna conductor;

the second antenna conductor and the second antenna-conductor-side feeding electrode being disposed between the two glass sheets;

a receiver-side feeding electrode disposed at a position to confront the second antenna-conductor-side feeding electrode and on the car-interior-side surface of the laminated glass;

wherein a distance between the first antenna-conductor-side feeding electrode and the receiver-side feeding electrode is from 2.5 to 100 mm.

29. The glass antenna according to claim 28, wherein the distance between the first antenna-conductor-side feeding electrode and the receiver-side feeding electrode is from 4 to 100 mm.

30. The glass antenna according to claim 28, wherein each of the first antenna-conductor-side feeding electrode, the second antenna-conductor-side feeding electrode and the receiver-side feeding electrode has an area of from 49 to 2,500 mm².

31. The glass antenna according to claim 28, wherein the laminated glass sheet has a shielding layer disposed on the car-interior-side surface;

and wherein at least one selected among the first antenna conductor, the first antenna-conductor-side feeding electrode and the receiver-side feeding electrode is disposed on the shielding layer.

32. The glass antenna according to claim 28, wherein at least one selected among the first antenna-conductor-side feeding electrode, the second antenna-conductor-side feeding electrode and the receiver-side feeding electrode is formed in a shape selected among a square shape, a substantially square shape, a circular shape, a substantially circular shape, an oval shape and a substantially oval shape.

33. The glass antenna according to claim 28, wherein a received carrier wave contains a frequency of from 473 to 767 MHz.

34. The glass antenna according to claim 28, wherein a received carrier wave contains a frequency of from 698 to 806 MHz.