JP2023051789A - vehicle window glass - Google Patents

Abstract

To provide a vehicle window glass having a different antenna pattern from conventional, which can acquire sufficient antenna reception sensitivity compactly without hindering a view.SOLUTION: A vehicle window glass 1 includes: a glass plate 2; and an antenna 10 which is provided on the glass plate 2 and includes a core wire side feeding part 11, a core wire side element 12 connected to the core wire side feeding part 11, an earth side feeding part 13, and an earth side element 14 connected to the earth side feeding part 13. The core wire side element 12 includes: a first element 12-1 electrically connected to the core wire side feeding part 11 to extend in the vertical direction opposite to a metal part 3 of the vehicle to have an open end; a second element 12-2 electrically connected to the core wire side feeding part 11 to extend in the vertical direction opposite to the metal part 3 of the vehicle to have an open end; and a third element 12-3 electrically connected to the core wire side feeding part 11 to extend in the horizontal direction apart from the earth side element 14.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle window glass.

In recent years, vehicle window glass has antennas that can receive radio waves in various broadcast wave frequency bands, such as AM broadcast waves, FM broadcast waves, European standard DAB (Digital Audio Broadcast) broadcast waves, and terrestrial digital TV broadcast waves. is known (see, for example, Patent Document 1). The frequency band of terrestrial digital television broadcasting waves, which are particularly high-frequency and wide-band, is 470 MHz (megahertz) to 710 MHz, and vehicle window glass equipped with an antenna capable of obtaining a desired antenna reception sensitivity in this band has been developed. ing.

JP 2018-164211 A

By the way, in the window glass for vehicles, when the antenna is arranged in the opening of the window glass, if the antenna pattern (pattern length) becomes large and the area where the antenna is arranged becomes large, for example, the field of vision becomes obstructed. Inconvenience such as slipping may occur. For this reason, vehicle window glass is required to have an antenna pattern that is as compact as possible and that does not impede the field of view by arranging the antenna pattern in the end region of the opening.

SUMMARY OF THE INVENTION The present invention provides a window glass for a vehicle that is compact, does not obstruct the field of view, and provides sufficient antenna reception sensitivity by using an antenna pattern different from conventional ones.

The present invention has the following aspects.
[1] A vehicle window glass to be attached to a vehicle, comprising: a glass plate; a core-side power supply portion provided on the glass plate and a core-side element connected to the core-side power supply portion; a ground-side power supply portion; and an antenna having a ground side element connected to a side feeding portion, wherein the core wire side element is electrically connected to the core wire side feeding portion and extends in a vertical direction opposite to the metal portion of the vehicle. a second element electrically connected to the core wire side power supply portion and extending in a vertical direction opposite to the metal portion of the vehicle and having an open end; and the core wire side A window glass for a vehicle, comprising: a third element electrically connected to a power feeding portion and extending in a horizontal direction away from the ground side element.

[2] The vehicle window glass of [1], wherein the third element extends horizontally and has an open end.

[3] The ratio between the length L1 of the first element and the length L2 of the second element is from (1.0:0.8) to (1.0:1.2). The vehicle window glass of [1] or [2].

[4] The length L1 and the length L2 are (0.16× λ x k) ≤ L1 ≤ (0.68 x λ x k) and (0.16 x λ x k) ≤ L2 ≤ (0.68 x λ x k). window glass.

[5] The length L3 of the third element is (0.067×λ, where λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate. x k) ≤ L3 ≤ (0.68 x λ x k),
The vehicle window glass according to any one of [1] to [4].

[6] The ground-side element has a fourth element that is electrically connected to the ground-side power feeder and extends horizontally close to the metal part at intervals for capacitive coupling, [1] to [5] ] any vehicle window glass.

[7] The ground-side element has a horizontal portion that extends horizontally and capacitively couples with the metal portion, and a vertical portion that connects the ground-side feeding portion and the horizontal portion and extends vertically. , the vehicle window glass of [6].

[8] The vehicle window glass of [6] or [7], wherein the fourth element extends away from the core wire side element and has an open end.

[9] The length L4 from the ground-side feeding portion to the open end of the fourth element is defined by: λ being the wavelength in air of the radio wave in the frequency band received by the antenna, k being the wavelength reduction rate of the glass plate, The vehicle window glass of [8], which satisfies (0.033×λ×k)≦L4≦(0.23×λ×k).

[10] From [1] to [ 9], the vehicle window glass.

[11] The length L5 of the fifth element is (0.10×λ, where λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate. xk)≦L5≦(0.68×λ×k), the vehicle window glass according to [10].

[12] The vehicle window glass according to any one of [1] to [11], wherein the core-side power supply portion and the ground-side power supply portion are horizontally arranged with a predetermined gap therebetween.

[13] When a first region and a second region are given with a vertical imaginary line passing through the midpoint between the core-side power feeding portion and the ground-side power feeding portion as a boundary, the core-side power feeding portion and the core-side element are: , the vehicular window glass according to [12], wherein the ground-side feeding section and the ground-side element are arranged in the second area.

[14] The vehicle window glass according to any one of [1] to [13], wherein the antenna is capable of receiving radio waves in the frequency band of terrestrial digital television broadcast waves.

[15] The vehicle window glass of any one of [1] to [14], wherein the antennas are diversity antennas arranged on one glass plate, and the plurality of antennas have symmetrical patterns. .

[16] The vehicle window glass of any one of [1] to [14], wherein a plurality of the antennas are diversity antennas arranged on one glass plate, and the plurality of antennas have an asymmetric pattern. .

[17] The vehicle window glass according to any one of [1] to [16], wherein the glass plate includes at least one of a windshield, a side glass, and a rear glass.

ADVANTAGE OF THE INVENTION According to this invention, the windowpane for vehicles is compact by the antenna pattern different from the past, and sufficient antenna reception sensitivity is obtained, without obstructing a view.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows an example of the vehicle window glass of 1st Embodiment. It is a figure which shows the pattern example of the antenna of the windowpane for vehicles of 1st Embodiment. It is a figure which shows the antenna characteristic in the Example of the windowpane for vehicles of 1st Embodiment. It is a figure which shows the pattern example of the antenna of the windowpane for vehicles of 2nd Embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the window glass for vehicles of embodiment of this invention is demonstrated with reference to drawings.

[First embodiment]
FIG. 1 is an external view showing an example of the vehicle window glass 1 of the first embodiment.
As shown in FIG. 1 , a vehicle window glass 1 is glass attached to a vehicle such as an automobile, and includes a glass plate 2 and a plurality of antennas 10 .

Glass plate 2 is, for example, a windshield of a vehicle. The glass plate 2 is attached to the vehicle with its outer peripheral portion covered with a metal portion 3 of the vehicle.
The metal part 3 is, for example, a body flange that covers the outer peripheral portion of the windshield of the vehicle.

Antenna 10 is, for example, an antenna capable of receiving the frequency band of terrestrial digital television broadcast waves (hereinafter referred to as "DTV band"). Here, the DTV band is from 470 MHz to 710 MHz. The antenna 10 is configured by placing a conductor such as a metal on the glass plate 2 . A plurality of antennas 10 are diversity antennas arranged on one glass plate 2 . In addition, only one antenna 10 of the vehicle window glass 1 of the present embodiment may be arranged on the glass plate 2 .

In this embodiment, two antennas 10, antenna 10-1 and antenna 10-2, are arranged on top of the glass plate 2, and the two antennas 10 (10-1, 10-2) have symmetrical patterns. have sex. The antennas 10-1 and 10-2 shown in FIG. 1 are configured in a symmetrical pattern in the left-right (horizontal direction), for example, centered on the center line CL1 of the glass plate 2. As shown in FIG. That is, the antenna 10-2 has a pattern in which the pattern of the antenna 10-1 is horizontally reversed. The term “having symmetry” used herein is not limited to the case where the pattern of the antenna 10-1 and the pattern of the antenna 10-2 completely match (has complete symmetry). Slight differences in arrangement, spacing, length of each element, and extension direction (angle) are permissible. In other words, if both the pattern of the antenna 10-1 and the pattern of the antenna 10-2 have the characteristics described below, they can be regarded as having symmetry.

Two antennas 10, antenna 10-1 and antenna 10-2, are arranged around the rearview mirror of the windshield of the vehicle so as not to obstruct the user's view.
Here, a detailed configuration of the antenna 10-1 will be described with reference to FIG.

FIG. 2 is a diagram showing a pattern example of the antenna 10-1 (10) of the vehicle window glass of this embodiment. Here, FIG. 2 is an enlarged plan view of the area AR in FIG.
As shown in FIG. 2, the antenna 10-1 (10) includes a core wire side feeding portion 11, a core wire side element 12, a ground side feeding portion 13, and a ground side element 14 provided on the glass plate 2. Prepare. The core-side power supply unit 11 and the ground-side power supply unit 13 are respectively connected to the core wire and coated wire (ground potential) of a coaxial cable (not shown) serving as a transmission line. Transmission lines are not limited to coaxial cables, and include strip lines, microstrip lines, slot lines, coplanar feed lines, and the like.

The core wire-side power supply portion 11 is a power supply electrode on the core wire side (hot side). The core-side power supply portion 11 is, for example, a rectangular or square electrode in which two opposing sides are arranged parallel to each other in the horizontal direction and the vertical direction. It can be any shape.

The core wire side element 12 is an antenna element on the core wire side, and is composed of a wire pattern of a conductor. The core wire side element 12 has a first element 12-1, a second element 12-2, and a third element 12-3. The core wire side element 12 is arranged to be connected to the core wire side power feeding portion 11 .

The first element 12-1 (first vertical portion) is electrically connected to the core wire side power supply portion 11, extends in the vertical direction opposite to the metal portion 3 of the vehicle, and has an open end. In this embodiment, the vertical direction also includes a substantially vertical direction. The substantially vertical direction is, for example, within ±15 degrees with respect to the vertical.

If the length L1 of the first element 12-1 satisfies the formula (1a), where λ is the wavelength in air of the radio wave in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2. good.

(0.16×λ×k)≦L1≦(0.68×λ×k) Equation (1a)

That is, the length L1 of the first element 12-1 is λ=422 mm to 638 mm as the wavelength in air of the DTV band, k≈0.5 (the wavelength reduction rate when the antenna 10 is sealed inside the laminated glass). case), it is, for example, 33 mm to 217 mm (33 mm ≤ L1 ≤ 217 mm). In addition, when the vehicle window glass 1 is a single plate glass, or when the antenna 10 is arranged on the outermost surface of laminated glass, it is preferable to design the wavelength reduction rate k≈0.7. In this case, the length L1 of the first element 12-1 is, for example, 47 mm to 304 mm (47 mm≦L1≦304 mm).

Also, the length L1 of the first element 12-1 preferably satisfies the formula (1b), and more preferably satisfies the formula (1c).

(0.20×λ×k)≦L1≦(0.45×λ×k) Expression (1b)
(0.27×λ×k)≦L1≦(0.34×λ×k) Equation (1c)

In the example shown in FIG. 2, the length L1 of the first element 12-1 is 100 mm, for example.

The second element 12-2 (second vertical portion) is electrically connected to the core wire side power supply portion 11, extends in the vertical direction opposite to the metal portion 3 of the vehicle, and has an open end.
The length L2 of the second element 12-2 satisfies formula (2a), where λ is the wavelength in air of the radio wave in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2. good.

(0.16×λ×k)≦L2≦(0.68×λ×k) Equation (2a)

That is, the length L2 of the second element 12-2 is λ=422 mm to 638 mm as the wavelength of the DTV band, and k≈0.5 (in the case of the wavelength reduction rate when the antenna 10 is sealed inside the laminated glass). For example, it is 33 mm to 217 mm (33 mm ≤ L2 ≤ 217 mm). Further, when the vehicle window glass 1 is a single plate glass, or when the antenna 10 is arranged on the outermost surface of laminated glass, the wavelength reduction rate k≈0.7 should be designed. In this case, the length L2 of the second element 12-2 is, for example, 47 mm to 304 mm (47 mm≦L2≦304 mm).

Also, the length L2 of the second element 12-2 preferably satisfies formula (2b), and more preferably satisfies formula (2c).

(0.20×λ×k)≦L2≦(0.45×λ×k) Expression (2b)
(0.27×λ×k)≦L2≦(0.34×λ×k) Equation (2c)

In the example shown in FIG. 2, the length L2 of the second element 12-2 is 100 mm, for example.

The ratio between the length L1 of the first element 12-1 and the length L2 of the second element 12-2 is, for example, from (1.00:0.80) to (1.00:1.20 ), Further, the ratio of the length L1 to the length L2 is preferably from (1.00:0.85) to (1.00:1.15), and from (1.00:0.90) to (1.00). :1.10), more preferably (1.00:0.95) to (1.00:1.05), and most preferably L1=L2. Also, the first element 12-1 and the second element 12-2 are arranged in parallel in the vertical direction. Parallel here also includes substantially parallel. Here, "substantially parallel" means, for example, that the angle between the first element 12-1 and the second element 12-2 is within ±10 degrees.

The third element 12-3 (first horizontal portion) is electrically connected to the core wire side power supply portion 11 and extends in the horizontal direction away from the ground side element . The third element 12-3 extends horizontally and has an open end. In this embodiment, the horizontal direction also includes a substantially horizontal direction. The substantially horizontal direction is, for example, within ±15 degrees with respect to the horizontal.

The length L3 of the third element 12-3 satisfies the formula (3a), where λ is the wavelength in the air of the radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2. good.

(0.067×λ×k)≦L3≦(0.68×λ×k) Equation (3a)

That is, the length L3 of the third element 12-3 is λ=422 mm to 638 mm as the wavelength of the DTV band, and k≈0.5 (in the case of the wavelength reduction rate when the antenna 10 is sealed inside the laminated glass). For example, it is 14 mm to 217 mm (14 mm≦L3≦217 mm). Further, when the vehicle window glass 1 is a single plate glass, or when the antenna 10 is arranged on the outermost surface of laminated glass, the wavelength reduction rate k≈0.7 should be designed. In this case, the length L3 of the third element 12-3 is, for example, 19 mm to 304 mm (19 mm≦L3≦304 mm).

The length L3 of the third element 12-3 preferably satisfies formula (3b), and more preferably satisfies formula (3c).

(0.13×λ×k)≦L3≦(0.45×λ×k) Expression (3b)
(0.20×λ×k)≦L3≦(0.34×λ×k) Expression (3c)

In the example shown in FIG. 2, the length L3 of the third element 12-3 is 60 mm, for example.

The ground-side power supply portion 13 is a ground-side (earth-side) power supply electrode. The ground-side power supply portion 13 and the core-side power supply portion 11 are horizontally arranged with a predetermined gap therebetween.

The ground-side element 14 is a ground-side antenna element, and is composed of a conductor pattern. The ground side element 14 has a fourth element 14-1 and a fifth element 14-2. Ground-side element 14 is arranged to be connected to ground-side power feeder 13 .

The fourth element 14-1 is electrically connected to the ground-side feeding portion 13 and extends horizontally close to the metal portion 3 with a gap D1 for capacitive coupling. The fourth element 14-1 extends away from the core wire side element 12 and has an open end.

If the length L4 of the fourth element 14-1 satisfies the formula (4a), where λ is the wavelength in air of the radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2. good.

(0.033×λ×k)≦L4≦(0.23×λ×k) Equation (4a)

That is, the length L4 of the fourth element 14-1 is λ=422 mm to 638 mm as the wavelength of the DTV band, and k≈0.5 (in the case of the wavelength reduction rate when the antenna 10 is sealed inside the laminated glass). For example, it is 7 mm to 74 mm (7 mm≦L4≦74 mm). Further, when the vehicle window glass 1 is a single plate glass, or when the antenna 10 is arranged on the outermost surface of laminated glass, the wavelength reduction rate k≈0.7 should be designed. In this case, the length L4 of the fourth element 14-1 is, for example, 9 mm to 103 mm (9 mm≦L4≦103 mm).

Also, the length L4 of the fourth element 14-1 preferably satisfies the formula (4b), and more preferably satisfies the formula (4c).

(0.067×λ×k)≦L4≦(0.21×λ×k) Expression (4b)
(0.10×λ×k)≦L4≦(0.18×λ×k) Equation (4c)

In the example shown in FIG. 2, the length L4 of the fourth element 14-1 is 65 mm, for example. Note that the length L4 is the length from the ground-side power supply portion 13 to the open end of the fourth element 14-1.

Further, the fourth element 14-1 has a horizontal portion 141 and a vertical portion 142,
The horizontal portion 141 (second horizontal portion) extends horizontally and capacitively couples with the metal portion 3 . A length L41 of the horizontal portion 141 is, for example, 55 mm. A distance D1 between the horizontal portion 141 and the metal portion 3 is 1 mm or more and 40 mm or less. The interval D1 is preferably 30 mm or less, more preferably 20 mm or less, even more preferably 15 mm or less, and particularly preferably 10 mm or less. In the example shown in FIG. 2, the distance D1 is 5 mm, for example. Note that the lower limit of the interval D1 may be 1 mm or more.

The vertical portion 142 (third vertical portion) connects the ground-side power supply portion 13 and the horizontal portion 141 and extends in the vertical direction. A length L42 of the vertical portion 142 is, for example, 10 mm. In this embodiment, the length L4 of the fourth element 14-1 is the sum of the length L41 of the horizontal portion 141 and the length L42 of the vertical portion 142 (L4=L41+L42).

The fifth element 14-2 (fourth vertical portion) is electrically connected to the ground-side power supply portion 13, extends in the vertical direction opposite to the metal portion 3, and has an open end. If the length L5 of the fifth element 14-2 satisfies the formula (5a), where λ is the wavelength in air of the radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2. good.

(0.10×λ×k)≦L5≦(0.68×λ×k) Equation (5a)

That is, the length L5 of the fifth element 14-2 is λ=422 mm to 638 mm as the wavelength of the DTV band, and k≈0.5 (in the case of the wavelength reduction rate when the antenna 10 is sealed inside the laminated glass). For example, it is 21 mm to 217 mm (21 mm ≤ L5 ≤ 217 mm). Further, when the vehicle window glass 1 is a single plate glass, or when the antenna 10 is arranged on the outermost surface of laminated glass, the wavelength reduction rate k≈0.7 should be designed. In this case, the length L5 of the fifth element 14-2 is, for example, 29 mm to 304 mm (29 mm≦L5≦304 mm).

Also, the length L5 of the fifth element 14-2 preferably satisfies the formula (5b), and more preferably satisfies the formula (5c).

(0.13×λ×k)≦L5≦(0.45×λ×k) Expression (5b)
(0.16×λ×k)≦L5≦(0.34×λ×k) Expression (5c)

In the example shown in FIG. 2, the length L5 of the fifth element 14-2 is, for example, 55 mm.

In addition, when the first area AR1 and the second area AR2 are given with a vertical imaginary line CL2 passing through the midpoint between the core-side power feeding part 11 and the ground-side power feeding part 13 as a boundary, the core-side power feeding part 11 and the core-side element 12 is arranged in the first area AR1. In addition, the ground-side feeding portion 13 and the ground-side element 14 are arranged in the second area AR2.
The conductor width of the core wire side element 12 and the ground side element 14 in plan view is, for example, 0.4 mm to 1.0 mm.

Next, the antenna characteristics of the vehicle window glass 1 of this embodiment will be described with reference to FIG.
FIG. 3 is a diagram showing antenna characteristics in an example of the vehicle window glass 1 of the present embodiment. FIG. 3 shows measured values of antenna characteristics in the DTV band using the pattern of the antenna 10-1. Since the antenna 10 is arranged on the outermost surface of the laminated glass, the wavelength shortening rate k≈0.7.

Here, the dimensions of the antenna 10 shown in FIG. 2 for obtaining an example are as follows.
Length L1 of the first element 12-1: 100 [mm]
Length L2 of the second element 12-2: 100 [mm]
Length L3 of the third element 12-3: 60 [mm]
Length L4 of fourth element 14-1: 65 [mm]
Length L141 of horizontal portion 141: 55 [mm]
Length L142 of vertical portion 142: 10 [mm]
Length L5 of fifth element 14-2: 55 [mm]
Interval D1: 5 [mm]

In the graph shown in FIG. 3, the vertical axis indicates the antenna gain [dBd], and the horizontal axis indicates the frequency of the DTV band. A waveform W1 represents the measured values of the antenna characteristics.
As shown by the waveform W1, the vehicle window glass 1 of the present embodiment provides sufficient and stable antenna reception sensitivity at frequencies in the DTV band (470 mHz to 710 MHz). That is, with the vehicle window glass 1 of the present embodiment, good antenna characteristics can be obtained for a wide frequency band such as the DTV band.

As described above, the vehicle window glass 1 of this embodiment is a vehicle window glass to be attached to a vehicle, and includes the glass plate 2 and the antenna 10 . The antenna 10 (for example, the antenna 10-1) is provided on the glass plate 2, and includes a core wire side feeding portion 11, a core wire side element 12 connected to the core wire side feeding portion 11, a ground side feeding portion 13, and a ground side feeding portion 13. and a ground side element 14 connected to the . The core wire side element 12 has a first element 12-1, a second element 12-2, and a third element 12-3. The first element 12-1 is electrically connected to the core wire side power supply portion 11, extends in the vertical direction opposite to the metal portion 3 of the vehicle, and has an open end. The second element 12-2 is electrically connected to the core wire side power supply portion 11, extends in the vertical direction opposite to the metal portion 3 of the vehicle, and has an open end. The third element 12-3 is electrically connected to the core wire side power supply portion 11 and extends in the horizontal direction away from the ground side element . Also, the third element 12-3 extends horizontally and has an open end.

As a result, the vehicle window glass 1 of the present embodiment provides sufficient and stable antenna reception sensitivity in the DTV band, as shown in FIG. 3, for example. In addition, since the vehicle window glass 1 of the present embodiment is arranged near the metal portion 3 of the vehicle, it is compact and does not obstruct the field of vision. Therefore, the vehicle window glass 1 of the present embodiment is compact, does not obstruct the field of view, and obtains sufficient antenna reception sensitivity due to the antenna pattern different from that of the conventional technology.

Further, in this embodiment, the ratio of the length L1 of the first element 12-1 to the length L2 of the second element 12-2 is from (1.0:0.8) to (1.0: 1.2).
Thus, the vehicle window glass 1 of the present embodiment has a length ratio of (1.0:0.8) to (1.0:1.2), and the first element 12-1 and the second element 12-2 run in parallel in the vertical direction, sufficient antenna reception sensitivity can be obtained.

Further, in this embodiment, the length L1 of the first element 12-1 and the length L2 of the second element 12-2 satisfy the above formulas (1a) and (2a).

As a result, the vehicle window glass 1 of the present embodiment can, for example, appropriately transmit broadcast waves in the UHF band (Ultra High Frequency band) including the DTV band by the first element 12-1 and the second element 12-2. can receive. The UHF band ranges from 300 MHz to 3 GHz (gigahertz).

Also, in this embodiment, the length L3 of the third element 12-3 satisfies the above formula (3a).

As a result, the vehicle window glass 1 of the present embodiment can appropriately receive broadcast waves in the UHF band including the DTV band, etc., by the third element 12-3.

In addition, in this embodiment, the ground-side element 14 has a fourth element 14-1 that is electrically connected to the ground-side power supply portion 13 and extends in the horizontal direction close to the metal portion 3 with an interval for capacitive coupling. . Further, the ground-side element 14 (for example, the fourth element 14-1) connects the horizontal part 141 extending in the horizontal direction and capacitively coupled with the metal part 3, the ground-side feeding part 13 and the horizontal part 141, and a vertical portion 142 extending in the vertical direction. The fourth element 14-1 extends away from the core wire side element 12 and has an open end.

Accordingly, the vehicle window glass 1 of the present embodiment can obtain sufficient antenna reception sensitivity due to capacitive coupling with the metal portion 3 .

Further, in this embodiment, the length L4 from the ground-side power supply portion 13 to the open end of the fourth element 14-1 satisfies the above formula (4a).

As a result, the vehicle window glass 1 of the present embodiment can appropriately receive broadcast waves in the UHF band including the DTV band, etc., by means of the fourth element 14-1.

Further, in the present embodiment, the ground-side element 14 includes a fifth element 14-2 electrically connected to the ground-side power supply portion 13 and extending in the vertical direction opposite to the metal portion 3 and having an open end. have.

As a result, the vehicle window glass 1 of the present embodiment can obtain a more sufficient antenna reception sensitivity due to the fifth element 14-2.

Also, in this embodiment, the length L5 of the fifth element 14-2 satisfies the above formula (5a).

As a result, the vehicle window glass 1 of the present embodiment can appropriately receive broadcast waves in the UHF band including the DTV band, etc., by means of the fifth element 14-2.

Further, in the present embodiment, the core-side power feeding portion 11 and the ground-side power feeding portion 13 are arranged horizontally with a predetermined gap therebetween.

Further, in the present embodiment, when the first area AR1 and the second area AR2 are given with a vertical imaginary line passing through the midpoint between the core-side power supply portion 11 and the ground-side power supply portion 13 as a boundary, the core-side power supply portion 11 and the core wire side element 12 are arranged in the first area AR1, and the ground side feeding section 13 and the ground side element 14 are arranged in the second area AR2.

As a result, in the vehicle window glass 1 of the present embodiment, for example, the core wire side power supply portion 11 and the core wire side element 12 are separated from the ground side power supply portion 13 and the ground side element 14, so that the DTV band Broadcast waves in the UHF band including, etc. can be received more stably.

Further, in this embodiment, the antennas 10 (10-1, 10-2) can receive radio waves in the DTV band.
As a result, the vehicle window glass 1 of the present embodiment is compact, does not interfere with the field of view, and obtains sufficient antenna reception sensitivity in the DTV band due to an antenna pattern different from that of the conventional technology.

Further, in this embodiment, the antennas 10 may be diversity antennas arranged on one glass plate 2, and the plurality of antennas 10 (10-1, 10-2) have symmetrical patterns.

As a result, the vehicle window glass 1 of the present embodiment is compact, does not obstruct the field of view, and obtains a sufficient antenna reception sensitivity due to the diversity antenna and the antenna pattern different from that of the conventional technology.

In addition, in this embodiment, the glass plate 2 may include at least one of a windshield, a side glass, and a rear glass.
Also, the plurality of antennas 10 (10-1, 10-2) may be asymmetrical in pattern only if they are completely symmetrical. That is, even if the pattern of the left and right antennas 10-1 and the pattern of the right antenna 10-2 are finely adjusted according to the left and right asymmetry of the vehicle instrument panel, steering wheel, etc., the left and right patterns are asymmetric. good.

As a result, the vehicle window glass 1 of the present embodiment is compact, does not obstruct the field of view, and obtains a sufficient antenna reception sensitivity due to the diversity antenna and the antenna pattern different from that of the conventional technology.

[Second embodiment]
Next, a vehicle window glass 1a according to a second embodiment will be described with reference to the drawings.
2nd Embodiment demonstrates the modification of the pattern of the antenna 10a with which the windowpane 1a for vehicles is provided. As in the first embodiment, the vehicle window glass 1a includes a plurality of antennas 10a, and the plurality of antennas 10a are diversity antennas having symmetrical patterns. In addition, only one antenna 10a of the vehicle window glass 1a of the present embodiment may be arranged on the glass plate 2 .

FIG. 4 is a diagram showing a pattern example of the antenna 10a of the vehicle window glass 1a of the second embodiment.
As shown in FIG. 4, the antenna 10a-1 (10a) includes a core wire side feeding portion 11, a core wire side element 12, a ground side feeding portion 13, and a ground side element 14a provided on the glass plate 2. Prepare.

In addition, in FIG. 4, the same reference numerals are assigned to the same configurations as in FIG. 2 described above, and the description thereof will be omitted. In this embodiment, a modified example of the pattern of the ground-side element 14 described above will be described.

In this embodiment, the ground-side element 14a is a ground-side antenna element, and is composed of a conductor pattern. The ground side element 14a has a fourth element 14-1a and a fifth element 14-2. The ground-side element 14 a is arranged to be connected to the ground-side power feeding section 13 .

The fourth element 14-1a is electrically connected to the ground-side power supply portion 13 and extends horizontally close to the metal portion 3 with a gap D1 for capacitive coupling. The fourth element 14-1a extends away from the core wire side element 12 and has an open end.

The length L4 of the fourth element 14-1a satisfies the above formula (4a), where λ is the in-air wavelength of the radio waves received by the antenna 10a, and k is the wavelength reduction rate of the glass plate 2. That is, the length L4 of the fourth element 14-1a is, for example, 10 mm to 100 mm (10 mm≦L4≦100 mm). The length L4 preferably satisfies the above formula (4b), and more preferably satisfies the above formula (4c). In the example shown in FIG. 4, the length L4 of the fourth element 14-1a is 65 mm, for example.

This embodiment is a modification in which the fourth element 14-1a does not have the vertical portion 142. FIG.
A distance D1 between the fourth element 14-1a and the metal portion 3 is 1 mm or more and 40 mm or less. The distance D1 is preferably 30 mm or less, more preferably 20 mm or less, still more preferably 15 mm or less, and particularly preferably 10 mm or less. In the example shown in FIG. 4, the distance D1 is 5 mm, for example. Note that the lower limit of the interval D1 may be 1 mm or more.
Other configurations of the present embodiment are the same as those of the above-described first embodiment, so description thereof will be omitted here.
As described above, the vehicle window glass 1a of the present embodiment includes the glass plate 2 and the antenna 10a. The antenna 10a (for example, antenna 10a-1) is provided on the glass plate 2 and has a core wire side feeding portion 11 and a core wire side element 12, a ground side feeding portion 13 and a ground side element 14a, and a ground side element 14a. extends horizontally from the ground-side feeding section 13 without the vertical section 142 .

As a result, the vehicle window glass 1a of the present embodiment has the same effect as the first embodiment, and the antenna pattern different from that of the conventional technology is compact, does not obstruct the field of view, and has sufficient antenna reception sensitivity. can get.

It should be noted that the present invention is not limited to the above embodiments, and can be modified without departing from the scope of the present invention.
For example, in each of the above embodiments, an example in which the frequency band that can be received by the antenna 10 (10a) is the DTV band has been described, but the present invention is not limited to this. The receivable frequency band of the antenna 10 (10a) may be, for example, the frequency band of FM broadcast waves, the frequency band of DAB (Digital Audio Broadcast) broadcast waves, or the like.

In each of the above embodiments, the vehicle window glass 1 (1a) is a diversity antenna having two antennas 10 (10a). good too. Further, the vehicle window glass 1 (1a) may be provided with a single antenna 10 (10a).

Moreover, in the first embodiment, the horizontal portion 141 has one open end, but may have two open ends.

1, 1a vehicle window glass 2 glass plate 3 metal part 10, 10-1, 10-2, 10a, 10a-1 antenna 11 core wire side feeding part 12 core wire side element 12-1 first element 12-2 second element 12-3 3rd element 13 Ground side feeding part 14, 14a Ground side element 14-1, 14-1a 4th element 14-2 5th element 141 Horizontal part 142 Vertical part

Claims (17)

A vehicle window glass to be attached to a vehicle,
a glass plate and
An antenna provided on the glass plate and having a core-side feeding portion and a core-side element connected to the core-side feeding portion, and a ground-side feeding portion and a ground-side element connected to the ground-side feeding portion,
The core wire side element is
a first element electrically connected to the core wire side power supply portion and extending in a vertical direction opposite to the metal portion of the vehicle and having an open end;
a second element electrically connected to the core wire side power supply portion and extending in a vertical direction opposite to the metal portion of the vehicle and having an open end;
A vehicle window glass, comprising: a third element electrically connected to the core wire side feeding portion and extending in a horizontal direction away from the ground side element. the third element extends horizontally and has an open end;
The vehicle window glass according to claim 1. The ratio between the length L1 of the first element and the length L2 of the second element is
(1.0:0.8) to (1.0:1.2),
is
The vehicle window glass according to claim 1 or 2. The length L1 and the length L2 are defined as follows, where λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate.
(0.16×λ×k)≦L1≦(0.68×λ×k), and (0.16×λ×k)≦L2≦(0.68×λ×k),
satisfy the
The vehicle window glass according to claim 3. The length L3 of the third element is given by the following, where λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate.
(0.067 x λ x k) ≤ L3 ≤ (0.68 x λ x k),
satisfy the
The vehicle window glass according to claim 1 or 2. The ground-side element has a fourth element that is electrically connected to the ground-side power supply portion and extends horizontally close to the metal portion at intervals for capacitive coupling,
The vehicle window glass according to claim 1 or 2. The ground-side element has a horizontal portion that extends in a horizontal direction and capacitively couples with the metal portion, and a vertical portion that connects the ground-side feeding portion and the horizontal portion and extends in a vertical direction.
The vehicle window glass according to claim 6. The fourth element extends away from the core wire side element and has an open end,
The vehicle window glass according to claim 6. The length L4 from the ground-side feeding portion to the open end of the fourth element is determined when λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate. ,
(0.033 x λ x k) ≤ L4 ≤ (0.23 x λ x k),
satisfy the
The vehicle window glass according to claim 8. The ground-side element has a fifth element electrically connected to the ground-side power supply portion and extending in a vertical direction opposite to the metal portion and having an open end.
The vehicle window glass according to claim 1 or 2. The length L5 of the fifth element is given by the following, where λ is the in-air wavelength of radio waves in the frequency band received by the antenna, and k is the wavelength reduction rate of the glass plate.
(0.10×λ×k)≦L5≦(0.68×λ×k),
satisfy the
The vehicle window glass according to claim 10. The core-side power supply unit and the ground-side power supply unit are horizontally arranged with a predetermined gap therebetween,
The vehicle window glass according to claim 1 or 2. When a first region and a second region are given with a vertical imaginary line passing through an intermediate point between the core-side power supply portion and the ground-side power supply portion as a boundary,
The core-side power feeding portion and the core-side element are arranged in the first region,
The ground-side power feeding section and the ground-side element are arranged in the second region,
The vehicle window glass according to claim 12. The antenna is capable of receiving radio waves in the frequency band of terrestrial digital television broadcasting waves,
The vehicle window glass according to claim 1 or 2. The antenna is a diversity antenna that is arranged in plurality on one glass plate,
The plurality of antennas have symmetrical patterns,
The vehicle window glass according to claim 1 or 2. The antenna is a diversity antenna that is arranged in plurality on one glass plate,
wherein the plurality of antennas has an asymmetric pattern;
The vehicle window glass according to claim 1 or 2. the glass plate includes at least one of a windshield, a side glass, and a rear glass;
The vehicle window glass according to claim 1 or 2.

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