Vehicle window glass

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

[Technical Field]

[0001] The present invention relates to a vehicle window glass. [Background technology]

[0002] In recent years, it has become known to arrange antennas on vehicle window glass 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 television broadcast waves (see, for example, Patent Document 1). The frequency band of terrestrial digital television broadcast waves is particularly high-frequency and wide-band, ranging from 470 MHz (megahertz) to 710 MHz, and development is underway to equip vehicle window glass with antennas that can achieve desired antenna reception sensitivity in this band. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-164211 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when an antenna is disposed in an opening of a vehicle window glass, if the antenna pattern (pattern length) becomes large and the area in which the antenna is disposed becomes large, inconveniences such as obstructing visibility may occur. Therefore, there is a demand for vehicle window glass that has an antenna pattern that is as compact as possible and that is disposed in the edge area of ​​the opening so as not to obstruct visibility.

[0005] The present invention provides a vehicle window glass that is compact and does not obstruct visibility by using an antenna pattern different from conventional ones, and that can obtain sufficient antenna reception sensitivity. [Means for solving the problem]

[0006] The present invention has the following aspects. [1] A vehicle window glass to be attached to a vehicle, comprising: a glass plate; and an antenna provided on the glass plate, the antenna having a core-side power supply portion and a core-side element connected to the core-side power supply portion, and a ground-side power supply portion and a ground-side element connected to the ground-side power supply portion, wherein the core-side element has: a first element electrically connected to the core-side power supply portion, extending in a vertical direction opposite to a metal part of the vehicle, and having an open end; a second element electrically connected to the core-side power supply portion, extending in a vertical direction opposite to the metal part of the vehicle, and having an open end; and a third element electrically connected to the core-side power supply portion, extending in a horizontal direction away from the ground-side element.

[0007] [2] The vehicle window glass according to [1], wherein the third element extends horizontally and has an open end.

[0008] [3] The vehicle window glass according to [1] or [2], wherein the ratio of the length L1 of the first element to the length L2 of the second element is from (1.0:0.8) to (1.0:1.2).

[0009] [4] The vehicle window glass of [3], wherein the lengths L1 and L2 satisfy (0.16×λ×k)≦L1≦(0.68×λ×k) and (0.16×λ×k)≦L2≦(0.68×λ×k), where λ is the wavelength in air of radio waves in the frequency band received by the antenna and k is the wavelength shortening rate of the glass plate.

[0010] [5] The length L3 of the third element satisfies (0.067×λ×k)≦L3≦(0.68×λ×k), where λ is the wavelength in air of radio waves in the frequency band received by the antenna, and k is the wavelength shortening rate of the glass plate. A vehicle window glass that meets any of the criteria set forth in [1] to [4].

[0011] [6] A vehicle window glass according to any one of [1] to [5], wherein the ground side element is electrically connected to the ground side power supply part and has a fourth element extending horizontally in close proximity to the metal part at a distance that allows capacitive coupling.

[0012] [7] The vehicle window glass of [6], wherein the ground side element has a horizontal portion extending horizontally and capacitively coupling with the metal portion, and a vertical portion connecting the ground side power supply portion and the horizontal portion and extending vertically.

[0013] [8] The vehicle window glass according to [6] or [7], wherein the fourth element extends away from the core element and has an open end.

[0014] [9] The vehicle window glass of [8], wherein the length L4 from the ground-side power supply part to the open end of the fourth element satisfies (0.033×λ×k)≦L4≦(0.23×λ×k), where λ is the wavelength in air of radio waves in the frequency band received by the antenna, and k is the wavelength shortening rate of the glass plate.

[0015]

[10] A vehicle window glass according to any one of [1] to [9], wherein the ground side element has a fifth element that is electrically connected to the ground side power supply part, extends vertically on the opposite side to the metal part, and has an open end.

[0016]

[11] The vehicle window glass according to

[10] , wherein the length L5 of the fifth element satisfies (0.10×λ×k)≦L5≦(0.68×λ×k), where λ is the wavelength in air of radio waves in a frequency band received by the antenna, and k is the wavelength shortening rate of the glass plate.

[0017]

[12] A vehicle window glass according to any one of [1] to

[11] , wherein the core wire side power supply portion and the ground side power supply portion are arranged horizontally at a predetermined interval.

[0018]

[13] The vehicle window glass according to

[12] , wherein when a first region and a second region are defined with a vertical imaginary line passing through a midpoint between the core wire side power supply portion and the ground side power supply portion as a boundary, the core wire side power supply portion and the core wire side element are arranged in the first region, and the ground side power supply portion and the ground side element are arranged in the second region.

[0019]

[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.

[0020]

[15] The vehicle window glass according to any one of [1] to

[14] , wherein the antenna is a diversity antenna arranged in multiple on one glass plate, and the multiple antennas have symmetrical patterns.

[0021]

[16] The vehicle window glass according to any one of [1] to

[14] , wherein the antenna is a diversity antenna arranged in multiple on one glass plate, and the multiple antennas have asymmetric patterns.

[0022]

[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. [Effects of the Invention]

[0023] According to the present invention, a vehicle window glass has an antenna pattern different from conventional ones, which is compact and does not obstruct visibility, and yet provides sufficient antenna reception sensitivity. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is an external view showing an example of a vehicle window glass according to a first embodiment. [Figure 2] 3A and 3B are diagrams showing examples of antenna patterns on a vehicle window glass according to the first embodiment. [Figure 3] FIG. 4 is a diagram showing antenna characteristics in an example of the vehicle window glass according to the first embodiment. [Figure 4] 10A and 10B are diagrams showing examples of antenna patterns on a vehicle window glass according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle window glass according to an embodiment of the present invention will now be described with reference to the drawings.

[0026] [First embodiment] FIG. 1 is an external view showing an example of a vehicle window glass 1 according to the first embodiment. As shown in FIG. 1, a vehicle window glass 1 is a glass that is attached to a vehicle such as an automobile, and includes a glass plate 2 and a plurality of antennas 10.

[0027] The glass plate 2 is, for example, a windshield of a vehicle. The glass plate 2 is attached to the vehicle with its outer periphery covered by a metal part 3 of the vehicle. The metal part 3 is, for example, a body flange that covers the outer periphery of the windshield of the vehicle.

[0028] The antenna 10 is an antenna capable of receiving, for example, a frequency band of terrestrial digital television broadcast waves (hereinafter referred to as the "DTV band"). Here, the DTV band is 470 MHz to 710 MHz. The antenna 10 is configured by arranging a conductor such as a metal on the glass plate 2. The antenna 10 is a diversity antenna in which a plurality of antennas 10 are arranged on one glass plate 2. Note that the vehicle window glass 1 of this embodiment may have only one antenna 10 arranged on the glass plate 2.

[0029] In this embodiment, two antennas 10, antenna 10-1 and antenna 10-2, are disposed above the glass plate 2, and the two antennas 10 (10-1, 10-2) have symmetrical patterns. Antennas 10-1 and 10-2 shown in FIG. 1 are configured with, for example, horizontally symmetrical patterns about the center line CL1 of the glass plate 2. That is, antenna 10-2 has a pattern that is a left-right mirror image of antenna 10-1. Note that "symmetrical" here does not necessarily mean that the patterns of antennas 10-1 and 10-2 are completely identical (completely symmetrical), but slight differences in the placement and spacing of the pair of feeding points, the length of each element, and the extension direction (angle) are also acceptable. In other words, if the patterns of antennas 10-1 and 10-2 both have the characteristics described below, they can be considered to be in the category of having symmetry.

[0030] The two antennas 10, antenna 10-1 and antenna 10-2, are arranged around the rearview mirror on the windshield of the vehicle so as not to obstruct the user's field of vision. Here, the detailed configuration of the antenna 10-1 will be described with reference to FIG.

[0031] 2 is a diagram showing an example of a pattern of the antenna 10-1 (10) on the vehicle window glass of this embodiment, where FIG. 2 is an enlarged plan view of the area AR in FIG. 2, the antenna 10-1 (10) includes a core-side feeding portion 11, a core-side element 12, a ground-side feeding portion 13, and a ground-side element 14, which are provided on a glass plate 2. The core-side feeding portion 11 and the ground-side feeding portion 13 are connected to the core wire and the covered wire (earth potential) of a coaxial cable (not shown), which serves as a transmission line, respectively. Note that the transmission line is not limited to a coaxial cable, and examples include a strip line, a microstrip line, a slot line, and a coplanar feeding line.

[0032] Core-side power supply portion 11 is a power supply electrode on the core side (hot side). Core-side power supply portion 11 is, for example, a rectangular or square electrode with two opposing sides arranged parallel to the horizontal and vertical directions, but it may also be a triangle, a polygon with pentagons or more sides, or another shape including a curve.

[0033] The core-side element 12 is an antenna element on the core side and is configured with a conductive line pattern. The core-side element 12 has a first element 12-1, a second element 12-2, and a third element 12-3. The core-side element 12 is arranged to be connected to the core-side feeding portion 11.

[0034] The first element 12-1 (first vertical portion) is electrically connected to the core-side feeding portion 11, extends in the vertical direction opposite the metal portion 3 of the vehicle, and has an open end. In this embodiment, the vertical direction also includes the approximately vertical direction. The approximately vertical direction is, for example, within ±15 degrees of the vertical direction.

[0035] The length L1 of the first element 12-1 should satisfy the formula (1a) below, where λ is the wavelength in air of radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2.

[0036] (0.16×λ×k)≦L1≦(0.68×λ×k)...Formula (1a)

[0037] That is, when the wavelength in air in the DTV band is λ=422 mm to 638 mm and k≈0.5 (the wavelength shortening rate when the antenna 10 is sealed inside laminated glass), the length L1 of the first element 12-1 is, for example, 33 mm to 217 mm (33 mm≦L1≦217 mm). If the vehicle window glass 1 is a single-pane glass or if the antenna 10 is disposed on the outermost surface of laminated glass, it is recommended to design it so that the wavelength shortening 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).

[0038] Furthermore, the length L1 of the first element 12-1 preferably satisfies the formula (1b), and more preferably satisfies the formula (1c).

[0039] (0.20×λ×k)≦L1≦(0.45×λ×k)...Formula (1b) (0.27×λ×k)≦L1≦(0.34×λ×k)...Formula (1c)

[0040] In the example shown in FIG. 2, the length L1 of the first element 12-1 is, for example, 100 mm.

[0041] The second element 12-2 (second vertical portion) is electrically connected to the core-side feeding 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 should satisfy the formula (2a) below, where λ is the wavelength in air of radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2.

[0042] (0.16×λ×k)≦L2≦(0.68×λ×k)...Formula (2a)

[0043] That is, when the wavelength of the DTV band is λ=422 mm to 638 mm and k≈0.5 (the wavelength shortening rate when the antenna 10 is sealed inside the laminated glass), the length L2 of the second element 12-2 is, for example, 33 mm to 217 mm (33 mm≦L2≦217 mm). Furthermore, when the vehicle window glass 1 is a single-pane glass or when the antenna 10 is disposed on the outermost surface of the laminated glass, it is recommended to design it so that the wavelength shortening rate k≈0.7. 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).

[0044] Furthermore, the length L2 of the second element 12-2 preferably satisfies the formula (2b), and more preferably satisfies the formula (2c).

[0045] (0.20×λ×k)≦L2≦(0.45×λ×k)...Formula (2b) (0.27×λ×k)≦L2≦(0.34×λ×k)...Equation (2c)

[0046] In the example shown in FIG. 2, the length L2 of the second element 12-2 is, for example, 100 mm.

[0047] The ratio of the length L1 of the first element 12-1 to the length L2 of the second element 12-2 is, for example, from (1.00:0.80) to (1.00:1.20). The ratio of the lengths L1 and L2 is preferably from (1.00:0.85) to (1.00:1.15), more preferably from (1.00:0.90) to (1.00:1.10), even more preferably from (1.00:0.95) to (1.00:1.05), and most preferably L1 = L2. The first element 12-1 and the second element 12-2 are arranged parallel to the vertical direction. "Parallel" here includes "approximately parallel." "Approximately parallel" here means, for example, that the angle between the first element 12-1 and the second element 12-2 is within ±10 degrees.

[0048] The third element 12-3 (first horizontal portion) is electrically connected to the core-side feeding portion 11 and extends in the horizontal direction away from the ground-side element 14. The third element 12-3 extends in the horizontal direction and has an open end. In this embodiment, the horizontal direction also includes the approximately horizontal direction. The approximately horizontal direction is, for example, within ±15 degrees of the horizontal.

[0049] The length L3 of the third element 12-3 should satisfy the formula (3a) below, where λ is the wavelength in air of radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2.

[0050] (0.067×λ×k)≦L3≦(0.68×λ×k)...Equation (3a)

[0051] That is, when the wavelength of the DTV band is λ=422 mm to 638 mm and k≈0.5 (the wavelength shortening rate when the antenna 10 is sealed inside the laminated glass), the length L3 of the third element 12-3 is, for example, 14 mm to 217 mm (14 mm≦L3≦217 mm). Furthermore, when the vehicle window glass 1 is a single-pane glass or when the antenna 10 is disposed on the outermost surface of the laminated glass, it is recommended to design it so that the wavelength shortening rate k≈0.7. 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).

[0052] The length L3 of the third element 12-3 preferably satisfies the formula (3b), and more preferably satisfies the formula (3c).

[0053] (0.13×λ×k)≦L3≦(0.45×λ×k)...Equation (3b) (0.20×λ×k)≦L3≦(0.34×λ×k)...Equation (3c)

[0054] In the example shown in FIG. 2, the length L3 of the third element 12-3 is, for example, 60 mm.

[0055] The ground-side power supply portion 13 is a power supply electrode on the ground side (earth side). The ground-side power supply portion 13 and the core-wire-side power supply portion 11 are arranged in the horizontal direction with a predetermined gap therebetween.

[0056] The ground-side element 14 is an antenna element on the ground side and is configured with a conductor pattern. The ground-side element 14 has a fourth element 14-1 and a fifth element 14-2. The ground-side element 14 is arranged to be connected to the ground-side power supply unit 13.

[0057] The fourth element 14-1 is electrically connected to the ground-side feeding part 13 and extends horizontally in close proximity with a distance D1 that allows capacitive coupling to the metal part 3. The fourth element 14-1 extends away from the core-side element 12 and has an open end.

[0058] The length L4 of the fourth element 14-1 should satisfy the formula (4a), where λ is the wavelength in air of radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2.

[0059] (0.033×λ×k)≦L4≦(0.23×λ×k)...Equation (4a)

[0060] That is, when the wavelength of the DTV band is λ=422 mm to 638 mm and k≈0.5 (the wavelength shortening rate when the antenna 10 is sealed inside the laminated glass), the length L4 of the fourth element 14-1 is, for example, 7 mm to 74 mm (7 mm≦L4≦74 mm). Furthermore, when the vehicle window glass 1 is a single-pane glass or when the antenna 10 is disposed on the outermost surface of the laminated glass, it is recommended to design it so that the wavelength shortening rate k≈0.7. 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).

[0061] Furthermore, the length L4 of the fourth element 14-1 preferably satisfies the formula (4b), and more preferably satisfies the formula (4c).

[0062] (0.067×λ×k)≦L4≦(0.21×λ×k)...Formula (4b) (0.10×λ×k)≦L4≦(0.18×λ×k)...Formula (4c)

[0063] 2, the length L4 of the fourth element 14-1 is, for example, 65 mm. Note that the length L4 is the length from the ground-side feeding portion 13 to the open end of the fourth element 14-1.

[0064] The fourth element 14-1 has a horizontal portion 141 and a vertical portion 142. The horizontal portion 141 (second horizontal portion) extends in the horizontal direction and is capacitively coupled to the metal portion 3. The length L41 of the horizontal portion 141 is, for example, 55 mm. The distance D1 between the horizontal portion 141 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, 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, for example, 5 mm. The lower limit of the distance D1 may be 1 mm or more.

[0065] The vertical portion 142 (third vertical portion) connects the ground-side feeding portion 13 and the horizontal portion 141 and extends in the vertical direction. The 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).

[0066] The fifth element 14-2 (fourth vertical portion) is electrically connected to the ground-side feeding portion 13, extends in the vertical direction opposite the metal portion 3, and has an open end. The length L5 of the fifth element 14-2 should satisfy formula (5a), where λ is the wavelength in air of radio waves in the frequency band received by the antenna 10, and k is the wavelength shortening rate of the glass plate 2.

[0067] (0.10×λ×k)≦L5≦(0.68×λ×k)...Formula (5a)

[0068] That is, when the wavelength of the DTV band is λ=422 mm to 638 mm and k≈0.5 (the wavelength shortening rate when the antenna 10 is sealed inside the laminated glass), the length L5 of the fifth element 14-2 is, for example, 21 mm to 217 mm (21 mm≦L5≦217 mm). Furthermore, when the vehicle window glass 1 is a single-pane glass or when the antenna 10 is disposed on the outermost surface of the laminated glass, it is recommended to design it so that the wavelength shortening rate k≈0.7. 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).

[0069] Furthermore, the length L5 of the fifth element 14-2 preferably satisfies the formula (5b), and more preferably satisfies the formula (5c).

[0070] (0.13×λ×k)≦L5≦(0.45×λ×k)...Formula (5b) (0.16×λ×k)≦L5≦(0.34×λ×k)...Equation (5c)

[0071] In the example shown in FIG. 2, the length L5 of the fifth element 14-2 is, for example, 55 mm.

[0072] When a first area AR1 and a second area AR2 are defined with a vertical imaginary line CL2 passing through the midpoint between the core-side feeding part 11 and the ground-side feeding part 13 as the boundary, the core-side feeding part 11 and the core-side element 12 are located within the first area AR1, while the ground-side feeding part 13 and the ground-side element 14 are located within the second area AR2. The conductor width of the core side element 12 and the ground side element 14 in plan view is, for example, 0.4 mm to 1.0 mm.

[0073] Next, with reference to FIG. 3, the antenna characteristics of the vehicle window glass 1 of this embodiment will be described. Fig. 3 is a diagram showing antenna characteristics in an example of the vehicle window glass 1 of this embodiment. Fig. 3 shows actual measured values ​​of antenna characteristics in the DTV band using the pattern of antenna 10-1. Note that, since the antenna 10 was placed on the outermost surface of the laminated glass, the wavelength shortening rate k was set to be approximately 0.7.

[0074] Here, the dimensions of the antenna 10 shown in FIG. 2 for obtaining the embodiment are as follows. Length of first element 12-1 L1: 100 [mm] Length of second element 12-2 L2: 100 [mm] Length of third element 12-3 L3: 60 mm Length of fourth element 14-1 L4: 65 mm Length of horizontal part 141 L141: 55 [mm] Length of vertical portion 142 L142: 10 [mm] Length of 5th element 14-2 L5: 55 [mm] Spacing D1: 5 [mm]

[0075] 3, the vertical axis represents antenna gain [dBd] and the horizontal axis represents the frequency of the DTV band, and waveform W1 represents the measured values ​​of the antenna characteristics. As shown by the waveform W1, the vehicle window glass 1 of this embodiment provides sufficient and stable antenna reception sensitivity in the DTV band frequency range (470 mHz to 710 MHz). That is, the vehicle window glass 1 of this embodiment provides good antenna characteristics over a wide frequency band such as the DTV band.

[0076] As described above, the vehicle window glass 1 of this embodiment is a vehicle window glass to be attached to a vehicle and includes a glass plate 2 and an antenna 10. The antenna 10 (for example, antenna 10-1) is provided on the glass plate 2 and includes a core-side feeding portion 11, a core-side element 12 connected to the core-side feeding portion 11, and a ground-side feeding portion 13, a ground-side element 14 connected to the ground-side feeding portion 13. The core-side element 12 includes 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-side feeding portion 11, extends in the vertical direction opposite the metal part 3 of the vehicle, and has an open end. The second element 12-2 is electrically connected to the core-side feeding portion 11, extends in the vertical direction opposite the metal part 3 of the vehicle, and has an open end. The third element 12-3 is electrically connected to the core-side feeding portion 11 and extends in the horizontal direction away from the ground-side element 14. The third element 12-3 also extends in the horizontal direction and has an open end.

[0077] As a result, the vehicle window glass 1 of this embodiment can obtain sufficient and stable antenna reception sensitivity in the DTV band, for example, as shown in Fig. 3. Furthermore, since the vehicle window glass 1 of this embodiment is disposed near the metal part 3 of the vehicle, it is compact and does not obstruct the field of view. Therefore, the vehicle window glass 1 of this embodiment can obtain sufficient antenna reception sensitivity while being compact and not obstructing the field of view, thanks to an antenna pattern different from that of conventional technology.

[0078] 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). As a result, the vehicle window glass 1 of this 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 side by side in the vertical direction, thereby achieving sufficient antenna reception sensitivity.

[0079] 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 formula (1a) and formula (2a).

[0080] As a result, the vehicle window glass 1 of this embodiment can appropriately receive broadcast waves in the UHF band (Ultra High Frequency band) including the DTV band, for example, by the first element 12-1 and the second element 12-2. The UHF band is 300 MHz to 3 GHz (gigahertz).

[0081] In this embodiment, the length L3 of the third element 12-3 satisfies the above formula (3a).

[0082] As a result, the vehicle window glass 1 of this embodiment can appropriately receive broadcast waves in the UHF band including the DTV band, for example, by the third element 12-3.

[0083] In this embodiment, the ground-side element 14 is electrically connected to the ground-side feeding portion 13 and has a fourth element 14-1 that extends horizontally close to the metal portion 3 at a distance that allows capacitive coupling. The ground-side element 14 (for example, the fourth element 14-1) has a horizontal portion 141 that extends horizontally and is capacitively coupled to the metal portion 3, and a vertical portion 142 that connects the ground-side feeding portion 13 and the horizontal portion 141 and extends vertically. The fourth element 14-1 extends away from the core-side element 12 and has an open end.

[0084] As a result, the vehicle window glass 1 of this embodiment can obtain sufficient antenna reception sensitivity due to capacitive coupling with the metal part 3.

[0085] In this embodiment, the length L4 from the ground-side feeding portion 13 to the open end of the fourth element 14-1 satisfies the above formula (4a).

[0086] As a result, the vehicle window glass 1 of this embodiment can properly receive broadcast waves in the UHF band including the DTV band, for example, by the fourth element 14-1.

[0087] In this embodiment, the ground-side element 14 also includes a fifth element 14-2 that is electrically connected to the ground-side feeding portion 13, extends in the vertical direction opposite to the metal portion 3, and has an open end.

[0088] As a result, the vehicle window glass 1 of this embodiment can obtain a more sufficient antenna reception sensitivity due to the fifth element 14-2.

[0089] In this embodiment, the length L5 of the fifth element 14-2 satisfies the above formula (5a).

[0090] As a result, the vehicle window glass 1 of this embodiment can appropriately receive broadcast waves in the UHF band including the DTV band, for example, by the fifth element 14-2.

[0091] In this embodiment, the core-side feeding portion 11 and the ground-side feeding portion 13 are arranged in the horizontal direction with a predetermined gap therebetween.

[0092] In addition, in this embodiment, when a first area AR1 and a second area AR2 are defined 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 the boundary, the core-side power supply portion 11 and the core-side element 12 are arranged in the first area AR1, and the ground-side power supply portion 13 and the ground-side element 14 are arranged in the second area AR2.

[0093] As a result, in the vehicle window glass 1 of this embodiment, for example, the core wire side power supply portion 11 and the core wire side element 12 are arranged separately from the ground side power supply portion 13 and the ground side element 14, so that broadcast waves in the UHF band, including the DTV band, can be received more stably.

[0094] In this embodiment, the antennas 10 (10-1, 10-2) are capable of receiving radio waves in the DTV band. As a result, the vehicle window glass 1 of this embodiment has an antenna pattern that is different from that of the prior art, and is compact and does not obstruct visibility, while providing sufficient antenna reception sensitivity in the DTV band.

[0095] In this embodiment, the antenna 10 may be a diversity antenna in which a plurality of antennas 10 are arranged on one glass plate 2, and the plurality of antennas 10 (10-1, 10-2) have symmetrical patterns.

[0096] As a result, the vehicle window glass 1 of this embodiment has a diversity antenna, and an antenna pattern different from that of the prior art, which makes it possible to obtain a compact size, does not obstruct the field of view, and still obtain sufficient antenna reception sensitivity.

[0097] In this embodiment, the glass plate 2 may include at least one of a windshield, a side glass, and a rear glass. Furthermore, the multiple antennas 10 (10-1, 10-2) do not necessarily have to be completely symmetrical, and the patterns may be asymmetrical. That is, depending on the left-right asymmetry of the vehicle's instrument panel, steering wheel, etc., the patterns of the left antenna 10-1 and the right antenna 10-2 may be finely adjusted to make the left-right patterns asymmetrical.

[0098] As a result, the vehicle window glass 1 of this embodiment has a diversity antenna, and an antenna pattern different from that of the prior art, which makes it possible to obtain a compact size, does not obstruct the field of view, and still obtain sufficient antenna reception sensitivity.

[0099] [Second embodiment] Next, a vehicle window glass 1a according to a second embodiment will be described with reference to the drawings. In the second embodiment, a modified example of the pattern of the antenna 10a provided on the vehicle window glass 1a will be described. As in the first embodiment, the vehicle window glass 1a is provided with multiple antennas 10a, and the multiple antennas 10a are diversity antennas with symmetrical patterns. Note that only one antenna 10a of the vehicle window glass 1a of this embodiment may be arranged on the glass plate 2.

[0100] FIG. 4 is a diagram showing an example of a pattern of the antenna 10a of the vehicle window glass 1a according to the second embodiment. As shown in FIG. 4, the antenna 10a-1 (10a) includes a core-side feeding portion 11, a core-side element 12, a ground-side feeding portion 13, and a ground-side element 14a, which are provided on the glass plate 2.

[0101] 4, the same components as those in the above-described Fig. 2 are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, a modified example of the pattern of the above-described ground side element 14 will be described.

[0102] In this embodiment, the ground-side element 14a is a ground-side antenna element and is configured with a conductor pattern. The ground-side element 14a includes a fourth element 14-1a and a fifth element 14-2. The ground-side element 14a is arranged to be connected to the ground-side power supply unit 13.

[0103] The fourth element 14-1a is electrically connected to the ground-side feeding part 13 and extends horizontally in close proximity with a distance D1 that allows capacitive coupling to the metal part 3. The fourth element 14-1a extends away from the core-side element 12 and has an open end.

[0104] The length L4 of the fourth element 14-1a satisfies the above formula (4a), where λ is the wavelength in air of the radio wave received by the antenna 10a and k is the wavelength shortening 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). Furthermore, 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, for example, 65 mm.

[0105] In this embodiment, the fourth element 14-1a is a modified example in which the vertical portion 142 is not included. Furthermore, the distance D1 between the fourth element 14-1a and the metal part 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, even more preferably 15 mm or less, and particularly preferably 10 mm or less. In the example shown in FIG. 4, the distance D1 is, for example, 5 mm. The lower limit of the distance D1 may be 1 mm or more. The other configurations of this embodiment are the same as those of the first embodiment described above, and therefore the description thereof will be omitted here. As described above, the vehicle window glass 1a of this embodiment includes the glass plate 2 and the antenna 10a. The antenna 10a (for example, the antenna 10a-1) is provided on the glass plate 2 and has the core-side feeding portion 11, the core-side element 12, the ground-side feeding portion 13, and the ground-side element 14a, and the ground-side element 14a does not have the vertical portion 142 and extends horizontally from the ground-side feeding portion 13.

[0106] As a result, the vehicle window glass 1a of this embodiment has the same effects as the first embodiment, and the antenna pattern different from that of the prior art makes it possible to obtain sufficient antenna reception sensitivity while being compact and not interfering with visibility.

[0107] The present invention is not limited to the above-described embodiments, and can be modified within the scope of the present invention. For example, in each of the above embodiments, the frequency band that can be received by the antenna 10 (10a) is the DTV band, but this is not limiting. The frequency band that can be received by the antenna 10 (10a) may be, for example, a frequency band of FM broadcast waves, a frequency band of DAB (Digital Audio Broadcast) broadcast waves, or the like.

[0108] In addition, in each of the above embodiments, the vehicle window glass 1 (1a) is described as a diversity antenna having two antennas 10 (10a), but it may also be provided with three or more antennas 10 (10a). Also, the vehicle window glass 1 (1a) may also be provided with a single antenna 10 (10a).

[0109] Furthermore, in the first embodiment, the horizontal portion 141 has one open end, but may have two open ends. [Explanation of symbols]

[0110] 1, 1a Vehicle window glass 2 glass plates 3 Metal parts 10, 10-1, 10-2, 10a, 10a-1 antennas 11 Core side power supply part 12 Core side element 12-1 First Element 12-2 Second Element 12-3 Third Element 13 Ground side power supply 14, 14a Ground element 14-1, 14-1a 4th element 14-2 5th Element 141 Horizontal part 142 Vertical section

Claims

1. A vehicle window glass to be attached to a vehicle, A glass plate and an antenna provided on the glass plate, the antenna having a core-side power supply portion and a core-side element connected to the core-side power supply portion, and a ground-side power supply portion and a ground-side element connected to the ground-side power supply portion; Equipped with The core wire side element is a first element electrically connected to the core-side power supply portion, 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-side power supply portion, extending in a vertical direction opposite to the metal portion of the vehicle, and having an open end; a third element electrically connected to the core-side feeding portion and extending in a horizontal direction away from the ground-side element, the core-side power supply portion and the ground-side power supply portion are arranged in a horizontal direction at a predetermined interval, When a first region and a second region are defined with a vertical imaginary line passing through a midpoint between the core-side feeding part and the ground-side feeding part as a boundary, the core-side feeding portion and the core-side element are disposed in the first region, the ground-side feeding section and the ground-side element are disposed within the second region. Vehicle window glass.

2. the third element extends horizontally and has an open end; The vehicle window glass according to claim 1.

3. The ratio of the length L1 of the first element to the length L2 of the second element is (1.0:0.8) to (1.0:1.2), That is, The vehicle window glass according to claim 1 or 2.

4. The lengths L1 and L2 are defined as follows, when the wavelength in the air of the radio wave in the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k: (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.

5. The length L3 of the third element is, when the wavelength in air of the radio wave in the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, (0.067 × λ × k) ≦ L3 ≦ (0.68 × λ × k), Satisfy the The vehicle window glass according to claim 1 or 2.

6. the ground-side element includes a fourth element electrically connected to the ground-side power supply portion and extending in the horizontal direction in close proximity to the metal portion at a distance that allows capacitive coupling therebetween; The vehicle window glass according to claim 1 or 2.

7. The ground-side element has a horizontal portion extending in a horizontal direction and capacitively coupled to the metal portion, and a vertical portion connecting the ground-side feeding portion and the horizontal portion and extending in a vertical direction. The vehicle window glass according to claim 6.

8. the fourth element extends away from the core element and has an open end; The vehicle window glass according to claim 6.

9. The length L4 from the ground-side feeding portion to the open end of the fourth element is expressed as follows, where λ is the wavelength in air of radio waves in the frequency band received by the antenna, and k is the wavelength shortening rate of the glass plate: (0.033 × λ × k) ≦ L4 ≦ (0.23 × λ × k), Satisfy the The vehicle window glass according to claim 8.

10. The ground-side element includes a fifth element electrically connected to the ground-side power supply portion, 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.

11. The length L5 of the fifth element is, when the wavelength in air of the radio wave in the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, (0.10 × λ × k) ≦ L5 ≦ (0.68 × λ × k), Satisfy the The vehicle window glass according to claim 10.

12. The antenna is capable of receiving radio waves in the frequency band of terrestrial digital television broadcast waves. The vehicle window glass according to claim 1 or 2.

13. the antenna is a diversity antenna, a plurality of which are arranged on one of the glass plates, The plurality of antennas have symmetrical patterns. The vehicle window glass according to claim 1 or 2.

14. the antenna is a diversity antenna, a plurality of which are arranged on one of the glass plates, The plurality of antennas have asymmetric patterns. The vehicle window glass according to claim 1 or 2.

15. 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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