JP2006115462A - High frequency glass antenna for automobile - Google Patents

Abstract

An object of the present invention is to provide a high-frequency glass antenna device for automobiles that improves transmission efficiency.
A first antenna conductor 3a and a first antenna conductor-side feeding electrode 2a are provided between two glass plates in a laminated window glass plate, and a second antenna conductor is provided between the two glass plates. 3b and the second antenna conductor side feeding electrode 2b are provided, and the first reception is provided at a position on the inner surface of the laminated window glass plate facing the first antenna conductor side feeding electrode 2a. A machine-side power supply electrode 1a is provided, and a second receiver-side power supply electrode 1b is provided on a surface of the laminated window glass plate on the inner side of the vehicle and facing the second antenna conductor-side power supply electrode 2b. The distance between the first antenna conductor side feeding electrode 2a and the second antenna conductor side feeding electrode 2b is 6 to 100 mm.
[Selection] Figure 1

Description

  The present invention relates to a high-frequency glass antenna for automobiles suitable for receiving terrestrial digital television broadcasting (473 to 767 MHz), UHF television broadcasting (450 to 750 MHz), or US digital television broadcasting (698 to 806 MHz).

  A laminated window glass plate of an automobile is formed by adhering two glass plates through a synthetic resin intermediate film. Conventionally, an antenna conductor and an antenna conductor are attached to an inner side adhesion surface (hereinafter also referred to as an “inner side adhesion surface of a laminated glass plate”) of the two glass plates constituting the laminated window glass plate. A high frequency glass antenna for automobiles has been reported in which a side feeding electrode is provided and a receiver side feeding electrode is provided at a position on the inner surface of the laminated window glass plate facing the antenna conductor side feeding electrode. (For example, refer to Patent Document 1).

  However, although there is a description in Patent Document 1 that there are two antenna conductors, an embodiment in which two receiver-side feeding electrodes are provided is not specifically described, and this conventional example is not described. There is a problem that the means used for digital television broadcasting or UHF television broadcasting for which two receiver-side power supply electrodes are preferably provided is unknown.

JP 61-30102 A (FIG. 6)

  An object of the present invention is to provide a high-frequency glass antenna for an automobile that eliminates the above-mentioned drawbacks of the prior art.

The present invention is connected to a first antenna conductor and a first antenna conductor between the two glass plates in a laminated window glass plate for an automobile having two glass plates bonded through an adhesive layer. A first antenna conductor side feeding electrode is provided, and a second antenna conductor side feeding electrode connected to the second antenna conductor and the second antenna conductor is further provided between the two glass plates. ,
A first receiver-side feeding electrode is provided on a surface of the laminated window glass plate on the inner side of the vehicle, facing the first antenna conductor-side feeding electrode, and further on the inner side of the laminated window glass plate. A high-frequency glass antenna for an automobile in which a second receiver-side power supply electrode is provided at a location opposite to the second antenna conductor-side power supply electrode,
Provided is a high-frequency glass antenna for an automobile, wherein a distance between a first antenna conductor side feeding electrode and a second antenna conductor side feeding electrode is 6 to 100 mm.

Further, a first antenna conductor and a first antenna connected to the first antenna conductor on a vehicle inner surface of a laminated window glass plate for an automobile having two glass plates bonded through an adhesive layer Conductor side feeding electrode is provided,
A second antenna conductor and a second antenna conductor side feeding electrode connected to the second antenna conductor are provided between the two glass plates in the laminated window glass plate,
A high-frequency glass antenna for an automobile in which a receiver-side power supply electrode is provided on a surface on the inner side of the laminated window glass plate and facing a second antenna conductor-side power supply electrode,
Provided is a high frequency glass antenna for an automobile, wherein a distance between a first antenna conductor side feeding electrode and a receiver side feeding electrode is 2.5 to 100 mm.

  Since the present invention adopts the above configuration, it is excellent in transmission efficiency of a received signal sent from the antenna conductor side feeding electrode to the receiver side feeding electrode, and can receive digital television broadcasting or UHF television broadcasting with good sensitivity.

  Hereinafter, the high frequency glass antenna for automobiles of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a perspective view showing a first embodiment of the high-frequency glass antenna for automobiles of the present invention, and FIGS. 2 and 3 are AA sectional views of the first embodiment shown in FIG. An embodiment is shown.

  1, 2 and 3, 1a is a first receiver-side power supply electrode (hereinafter referred to as a first counter electrode), 1b is a second receiver-side power supply electrode (hereinafter referred to as a second counter electrode), 2a is the first antenna conductor side feeding electrode, 2b is the second antenna conductor side feeding electrode, 3a is the first antenna conductor, 3b is the second antenna conductor, 4 is the vehicle interior glass plate, and 5 is the vehicle exterior glass. A plate 6 is a synthetic resin intermediate film. 2 and 3, 9a and 9b are metal terminals provided as necessary, and are omitted in FIG. 1, 2, and 3, the upper side is the vehicle interior side.

  Examples of the laminated window glass plate in the present invention include a laminated window glass plate for an automobile formed by bonding two glass plates through an intermediate film 6 made of synthetic resin. In the example shown in FIGS. 1, 2, and 3, the vehicle interior glass plate 4 and the vehicle exterior glass plate 5 are bonded together by an intermediate film 6 interposed between the vehicle interior glass plate 4 and the vehicle exterior glass plate 5. ing. Therefore, the intermediate film 6 has adhesiveness.

  In the first embodiment, the first antenna conductor 3a, the first antenna conductor side feeding electrode 2a, the second antenna conductor 3b, and the second antenna conductor side feeding electrode 2b are formed on the vehicle interior side glass plate 4 and the vehicle exterior side. It is provided between the glass plate 5.

  In the example shown in FIG. 2, the first antenna conductor 3 a, the first antenna conductor side feeding electrode 2 a, the second antenna conductor 3 b, and the second antenna conductor side feeding electrode 2 b are laminated glass of the vehicle interior side glass plate 4. It is provided on the adhesive surface on the inner side of the plate.

  In the example shown in FIG. 3, the first antenna conductor 3 a, the first antenna conductor side feeding electrode 2 a, the second antenna conductor 3 b, and the second antenna conductor side feeding electrode 2 b are made of laminated glass on the outside glass plate 5. It is provided on the adhesive surface on the inner side of the plate. That is, in the first embodiment, the place where the first antenna conductor 3a, the first antenna conductor side feeding electrode 2a, the second antenna conductor 3b, and the second antenna conductor side feeding electrode 2b are provided There is no particular limitation as long as it is between the glass plate 4 and the vehicle outer side glass plate 5. For example, the antenna conductors 3 a and 3 b and the antenna conductor side feeding electrodes 2 a and 2 b may be provided in the intermediate film 6. The antenna performance is determined as appropriate.

  As described above, the first antenna conductor 3a and the first antenna conductor side feeding electrode 2a are disposed on the inner surface of the laminated glass plate of the inner glass plate 4 or on the inner side of the laminated glass plate of the outer glass plate 5. The second antenna conductor 3b and the second antenna conductor-side feeding electrode 2b may be provided on the bonding surface, or the bonding surface on the inner side of the laminated glass plate of the inner glass plate 4 or the outer glass plate 5 It may be provided on the adhesive surface on the inner side of the laminated glass plate.

  In the first embodiment, a first facing is provided at a position on the inner surface of the laminated window glass plate (the inner surface of the inner glass plate 4) facing the first antenna conductor side feeding electrode 2a. The electrode 1a is provided, and the second counter electrode 1b is provided at a position on the inner surface of the laminated window glass plate facing the second antenna conductor side feeding electrode 2b.

  In this way, the first antenna conductor side feeding electrode 2a and the first counter electrode 1a are opposed to each other, so that the first antenna conductor side feeding electrode 2a and the first counter electrode 1a are electromagnetically coupled and capacitively coupled. The received signal excited by the first antenna conductor 3a is transmitted in the order of the first antenna conductor-side feeding electrode 2a and the first counter electrode 1a and connected to the first counter electrode 1a. Is sent to the receiver side by a cable (not shown).

  By making the second antenna conductor side feeding electrode 2b and the second counter electrode 1b face each other, the second antenna conductor side feeding electrode 2b and the second counter electrode 1b are at least one of electromagnetic coupling and capacitive coupling. The received signal excited by the second antenna conductor 3b is transmitted in the order of the second antenna conductor side feeding electrode 2b and the second counter electrode 1b, and is connected to the second counter electrode 1b (see FIG. (Not shown) and sent to the receiver side. That is, in the first embodiment, the potential difference between the first counter electrode 1a and the second counter electrode 1b is used as a reception signal.

  In addition, when the masking film is provided on the inner surface of the laminated window glass plate, the first counter electrode 1a or the second counter electrode 1b may be provided on the masking film. An example of the material of the masking film is ceramic.

  In the first embodiment, the distance between the first antenna conductor side feeding electrode 2a and the second antenna conductor side feeding electrode 2b (that is, the first antenna conductor side feeding electrode 2a and the second antenna conductor side). The distance of the closest part to the feeding electrode 2b) is 6 to 100 mm. It is preferable that the distance is 6 mm or more because transmission efficiency is improved. It is preferable that the distance is 100 mm or less because the cable connected to the first counter electrode 1a and the second counter electrode 1b can be easily mounted. In particular, when a coaxial cable is used as the cable, it is preferable that the distance is 100 mm or less because mounting is easy. A preferable range of this interval is 6 to 100 mm, a more preferable range of this interval is 8 to 100 mm, a particularly preferable range is 12 to 80 mm, and a most preferable range is 20 to 50 mm.

  When this condition is applied, the thickness of the vehicle inner side glass plate 4 or the sum of the thickness of the vehicle inner side glass plate 4 and the thickness of the intermediate film 6 is 1.75 to 5.25 mm. Is preferred. A more preferable range of this range is 2.0 to 4.9 mm. Note that the distance between the first antenna conductor side power supply electrode 2a and the second antenna conductor side power supply electrode 2b is equal to the distance between the first counter electrode 1a and the second counter electrode 1b. Is preferred.

In the first embodiment, when the distance between the first antenna conductor side feeding electrode 2a and the second antenna conductor side feeding electrode 2b is 6 to 100 mm, the first antenna conductor side feeding electrode The area of each of 2a, the second antenna conductor side feeding electrode 2b, the first counter electrode 1a and the second counter electrode 1b is preferably 49 to 900 mm ² , particularly 81 to 600 mm ² . Within this range, the areas of the second antenna conductor side feeding electrode 2b, the first counter electrode 1a, and the second counter electrode 1b may be different.

  FIG. 4 is a perspective view showing a second embodiment of the high-frequency glass antenna for automobiles of the present invention, and FIG. 5 is a cross-sectional view taken along the line BB of the second embodiment shown in FIG. In the second embodiment, the first antenna conductor 3a and the first antenna conductor side feeding electrode 2a are provided on the inner surface of the laminated window glass plate.

  The places where the second antenna conductor 3b, the second antenna conductor side feeding electrode 2b, and the receiver side feeding electrode 1b (counter electrode 1b) are provided are the same as in the first embodiment. By making the second antenna conductor side feeding electrode 2b and the counter electrode 1b face each other, the second antenna conductor side feeding electrode 2b and the counter electrode 1b become at least one of electromagnetic coupling and capacitive coupling, The reception signal excited by the antenna conductor 3b is transmitted in the order of the second antenna conductor side feeding electrode 2b and the counter electrode 1b, and is sent to the receiver side by a cable connected to the counter electrode 1b. That is, the reception signal is sent to the receiver side by the cable connected to the first antenna conductor side feeding electrode 2a and the counter electrode 1b. In the second embodiment, the potential difference between the first antenna conductor side feeding electrode 2a and the counter electrode 1b is used as a reception signal.

  In the second embodiment, the distance between the first antenna conductor side power supply electrode 2a and the counter electrode 1b (that is, the distance of the closest portion between the first antenna conductor side power supply electrode 2a and the counter electrode 1b). ) Is 2.5 to 100 mm. It is preferable that the distance is 2.5 mm or more because transmission efficiency is improved. When the distance is 100 mm or less, it is preferable because the cable connected to the counter electrode 1b can be easily mounted. In particular, when a coaxial cable is used as the cable, it is preferable that the distance is 100 mm or less because mounting is easy.

  A preferable range of this interval is 4 to 100 mm, a more preferable range of this interval is 6 to 100 mm, a particularly preferable range is 6 to 80 mm, and a most preferable range is 6 to 50 mm. Further, from the viewpoint of improving the transmission efficiency, the distance is preferably 10 mm or less, particularly 8 mm or less.

In the second embodiment, when the interval is 2.5 to 10 mm, the areas of the first antenna conductor side feeding electrode 2a, the second antenna conductor side feeding electrode 2b, and the counter electrode 1b are 49. ˜900 mm ² , particularly 81 to 600 mm ² is preferable. If it is this range, each area of the 1st antenna conductor side feed electrode 2a, the 2nd antenna conductor side feed electrode 2b, and the counter electrode 1b may differ. When this condition is applied, the thickness of the vehicle inner side glass plate 4 or the sum of the thickness of the vehicle inner side glass plate 4 and the thickness of the intermediate film 6 is 1.75 to 5.25 mm. Is preferred. A more preferable range of this range is 2.0 to 4.9 mm.

  When a concealing film is provided on the inner surface of the laminated window glass plate, the first antenna conductor 3a, the first antenna conductor side feeding electrode 2a, and the counter electrode 1b are formed on the concealing film. You may provide at least one chosen from these.

In the present invention, the area of each of the first antenna conductor side feeding electrode 2a, the first counter electrode 1a, the second antenna conductor side feeding electrode 2b, or the second counter electrode 1b is 140 to 2500 mm ^2. preferable. It is preferable that the area of these electrodes is 140 mm ² or more because transmission efficiency is improved. When the area of each of these electrodes is 2500 mm ² or less, the transmission efficiency is improved, and the area of these electrodes does not become too large. A preferable range of the area of these electrodes is 230 to 2500 mm ² , a more preferable range is 260 to 1840 mm ² , a particularly preferable range is 300 to 1600 mm ² , and a most preferable range is 360 to 900 mm ² . .

  In the present invention, the relative dielectric constant of the vehicle interior glass plate 4 and the relative dielectric constant of the vehicle exterior glass plate 5 are each preferably 6.0 to 7.5, and more preferably 6.5 to 7.0. At least one shape selected from the first antenna conductor side feeding electrode 2a, the first counter electrode 1a, the second antenna conductor side feeding electrode 2b, and the second counter electrode 1b is a square, a substantially square, a circle, a substantially A circle, an ellipse, and a substantially ellipse may be sufficient, and it is not specifically limited.

  In the present invention, each material of the first antenna conductor side feeding electrode 2a, the first counter electrode 1a, the second antenna conductor side feeding electrode 2b, or the second counter electrode 1b is made of copper foil, copper plate, copper wire. Is mentioned. In addition to this, a silver paste may be printed and baked on the laminated glass plate inner side adhesive surface of the vehicle inner side glass plate 4 or the laminated glass plate inner side bonded surface of the vehicle outer side glass plate 5. When the antenna conductor and the antenna conductor side feeding electrode are not connected to each other and are provided on the laminated glass plate, the connecting means between the antenna conductor and the antenna conductor side feeding electrode may be soldering, welding, brazing or conductive bonding. Adhesion with an agent is mentioned. Examples of the material of the intermediate film 6 include polyvinyl butyral.

  The present invention will be described below with reference to examples, but the present invention is not limited to these examples, and various improvements and modifications are also included in the present invention as long as the gist of the present invention is not impaired.

  In the following examples, data was taken at 450 MHz, 500 MHz, 550 MHz, 600 MHz, 650 MHz, 700 MHz, 750 MHz, and 800 MHz, and a simple average of transmission efficiency (dB value) at each frequency was used in the characteristic diagram shown below. . Hereinafter, embodiments will be described in detail with reference to the drawings.

"Example 1 (Example)"
A pseudo test apparatus for an automotive high frequency glass antenna as shown in FIG. 6 was manufactured. The first antenna conductor side feeding electrode 2a, the second antenna conductor side feeding electrode 2b, the first counter electrode 1a, and the second counter electrode 1b are formed by sticking a copper foil on the glass plate 15 with an adhesive. Produced.

  In FIG. 6, 11a is an inner conductor of the first coaxial cable, 11b is an outer conductor of the first coaxial cable, 12a is an inner conductor of the second coaxial cable, 12b is an outer conductor of the second coaxial cable, 13 is A lead wire connecting the outer conductor 11b and the first antenna conductor side feeding electrode 2a, 14 is a lead wire connecting the outer conductor 12b and the first counter electrode 1a, and La is the first counter electrode. The distance between 1a and the second counter electrode 1b (the distance between the first antenna conductor side power supply electrode 2a and the second antenna conductor side power supply electrode 2b). The specifications of the used copper foil, glass plate 15, and coaxial cable are shown below.

The dimensions of the first antenna conductor side feeding electrode 2a, the second antenna conductor side feeding electrode 2b, the first counter electrode 1a and the second counter electrode 1b are 20 × 20 mm,
Copper foil thickness 0.06mm,
Electrical resistivity of copper foil 2.0 × 10 ⁻⁶ Ωcm,
Glass plate thickness 3.5mm,
The impedance of the coaxial cable is 50Ω.

  Adhesion between the inner conductor 11a and the second antenna conductor side feeding electrode 2b, adhesion between the inner conductor 12a and the second counter electrode 1b, adhesion between the outer conductor 11b and the lead wire 13, and outer conductor 11b and the lead wire 13 The bonding between the outer conductor 12b and the lead wire 14, the bonding between the first antenna conductor side feeding electrode 2a and the lead wire 13, and the bonding between the first counter electrode 1a and the lead wire 14 are performed by soldering. It was.

  A signal voltage having a predetermined voltage value was applied between the inner conductor 11a and the outer conductor 11b, the signal voltage between the inner conductor 12a and the outer conductor 12b was measured, and the interval La was changed from 5 to 50 mm. . The vertical axis represents transmission efficiency (dB) and the horizontal axis represents the interval La, and the characteristics are shown in FIG.

"Example 2 (Example)"
The test apparatus used in Example 1 was modified, and the first antenna conductor side feeding electrode 2a, the second antenna conductor side feeding electrode 2b, and the second counter electrode 1b were provided on the glass plate 15, as shown in FIG. The following test was conducted on the second embodiment shown in FIG. The outer conductor 11b and the outer conductor 12b were connected by a lead wire 23. The connection means in Example 2 was the same as in Example 1 using solder, and the specifications not described were the same as in Example 1.

  The distance Lb between the first antenna conductor side feeding electrode 2a and the second counter electrode 1b is changed to 1, 2, 3, 4, 5, 10, 20, 30, 40, 50 mm, and the inner conductor A signal voltage having a predetermined voltage value was applied between 11a and the outer conductor 11b, and the signal voltage between the inner conductor 12a and the outer conductor 12b was measured. The vertical axis represents transmission efficiency (dB) and the horizontal axis represents the distance Lb, and the characteristics are shown in FIG.

  Used for glass antennas for automobiles that receive terrestrial digital television broadcasts or UHF television broadcasts.

The perspective view which shows the 1st embodiment of the high frequency glass antenna for motor vehicles of this invention. FIG. 2 is an AA cross-sectional view of the first embodiment shown in FIG. 1. FIG. 3 is a cross-sectional view of the first embodiment shown in FIG. The perspective view which shows the 2nd embodiment of this invention. BB sectional drawing of the 2nd embodiment shown in FIG. The block diagram of the pseudo test apparatus of the high frequency glass antenna for motor vehicles used for the Example. In Example 1, the vertical axis is the transmission efficiency and the horizontal axis is the interval La. The block diagram of the pseudo test device of the high frequency glass antenna for motor vehicles used in Example 2. FIG. In Example 2, the vertical axis is the transmission efficiency and the horizontal axis is the interval Lb.

Explanation of symbols

1a: First receiver-side power supply electrode (first counter electrode)
1b: Second receiver-side power supply electrode (second counter electrode)
2a: first antenna conductor side feeding electrode 2b: second antenna conductor side feeding electrode 3a: first antenna conductor 3b: second antenna conductor 4: vehicle interior glass plate 5: vehicle exterior glass plate 6: intermediate film

Claims (12)

A first antenna conductor and a first antenna connected to the first antenna conductor between the two glass plates in a laminated window glass plate for an automobile having two glass plates bonded via an adhesive layer A conductor-side power supply electrode is provided, and a second antenna conductor-side power supply electrode connected to the second antenna conductor and the second antenna conductor is further provided between the two glass plates.
A first receiver-side feeding electrode is provided on a surface of the laminated window glass plate on the inner side of the vehicle, facing the first antenna conductor-side feeding electrode, and further on the inner side of the laminated window glass plate. A high-frequency glass antenna for an automobile in which a second receiver-side power supply electrode is provided at a location opposite to the second antenna conductor-side power supply electrode,
A high-frequency glass antenna for an automobile, wherein a distance between the first antenna conductor side feeding electrode and the second antenna conductor side feeding electrode is 6 to 100 mm. The area of 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 is 140 to 2500 mm ^2. The high frequency glass antenna for automobiles described in 1.   A concealing film is provided on the inner surface of the laminated window glass plate, and at least one of the first receiver-side feeding electrode and the second receiver-side feeding electrode is provided on the concealing film. The high frequency glass antenna for automobiles according to claim 1 or 2, wherein   At least one shape selected from 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 a quadrangle, The high-frequency glass antenna for automobiles according to any one of claims 1 to 3, wherein the high-frequency glass antenna for automobiles is one kind selected from a substantially quadrilateral, a circle, a substantially circle, an ellipse and a substantially ellipse. The first antenna conductor side connected to the first antenna conductor and the first antenna conductor on the inner surface of the laminated window glass plate for an automobile having two glass plates bonded through an adhesive layer A feeding electrode is provided,
A second antenna conductor and a second antenna conductor side feeding electrode connected to the second antenna conductor are provided between the two glass plates in the laminated window glass plate,
A high-frequency glass antenna for an automobile in which a receiver-side power supply electrode is provided on a surface on the inner side of the laminated window glass plate and facing a second antenna conductor-side power supply electrode,
A high-frequency glass antenna for an automobile, wherein a distance between the first antenna conductor side feeding electrode and the receiver side feeding electrode is 2.5 to 100 mm.   The high-frequency glass antenna for an automobile according to claim 5, wherein a distance between the first antenna conductor side feeding electrode and the receiver side feeding electrode is 4 to 100 mm. 7. The high-frequency glass for automobiles according to claim 5, 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 140 to 2500 mm ^2. antenna.   A concealing film is provided on the inner surface of the laminated window glass plate, and the first antenna conductor, the first antenna conductor side feeding electrode, and the receiver side feeding are provided on the concealing film. The high frequency glass antenna for automobiles according to any one of claims 5 to 7, wherein at least one selected from electrodes is provided.   At least one shape selected from the first antenna conductor-side feeding electrode, the second antenna conductor-side feeding electrode, and the receiver-side feeding electrode is a square, a substantially square, a circle, a substantially circle, an ellipse, and a substantially ellipse. The high frequency glass antenna for automobiles according to any one of claims 5 to 8, which is one kind selected.   The high frequency glass antenna for automobiles according to any one of claims 1 to 9, wherein the frequency of the received carrier wave includes a frequency existing between 473 and 767 MHz.   The high frequency glass antenna for automobiles according to any one of claims 1 to 9, wherein the frequency of the received carrier wave includes a frequency existing between 450 and 750 MHz. The high frequency glass antenna for automobiles according to any one of claims 1 to 9, wherein the frequency of the received carrier wave includes a frequency existing between 698 and 806 MHz.

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