Vehicle window glass

Abstract

To provide a vehicle window glass 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, an earth side feeding part 13 and an earth side element 14. 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 horizontal direction; and a second element 12-2 electrically connected to the core wire side feeding part 11 to extend to approach a metal part 3 of the vehicle. The second element 12-2 includes: a first horizontal part 121 placed farther than the metal part 3 and close to the core wire side feeding part 11 to extend in the horizontal direction; and a second horizontal part 122 placed in the vicinity of the metal part 3 to extend in the horizontal direction to have capacitive coupling with the metal part 3.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 Laid-Open No. 2017-060069 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, does not obstruct visibility, and provides 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 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, wherein the core-side element has a first element electrically connected to the core-side feeding portion and extending horizontally, and a second element electrically connected to the core-side feeding portion and extending to approach a metal portion of the vehicle, and the second element includes a first horizontal portion located farther than the metal portion and near the core-side feeding portion and extending horizontally, and a second horizontal portion located in the vicinity of the metal portion, extending horizontally, and capacitively coupled to the metal portion.

[0007] [2] The vehicle window glass of [1], wherein the second element surrounds the first element and extends toward the metal portion.

[0008] [3] The vehicle window glass of [2], wherein the length L1 of the first element satisfies (0.033×λ×k)≦L1≦(0.36×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.

[0009] [4] The vehicle window glass of [1], wherein the first element includes a fourth horizontal portion extending horizontally and capacitively coupled to the metal portion.

[0010] [5] The vehicle window glass of [4], wherein the length L1 of the first element satisfies (0.033×λ×k)≦L1≦(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.

[0011] [6] The vehicle window glass of [4] or [5], wherein the second horizontal portion and the fourth horizontal portion are positioned on approximately the same straight line with a predetermined gap therebetween.

[0012] [7] A vehicle window glass according to any one of [1] to [6], wherein the length L2 of the second element satisfies (0.50×λ×k)≦L2≦(0.90×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.

[0013] [8] A vehicle window glass according to any one of [1] to [7], wherein the distance between the second horizontal portion and the metal portion is 1 mm or more and 40 mm or less.

[0014] [9] A vehicle window glass according to any one of [1] to [8], wherein the length L22 of the second horizontal portion satisfies (0.016×λ×k)≦L22≦(0.25×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] The vehicle window glass according to any one of [1] to [9], wherein the second element has a first vertical portion that connects the first horizontal portion and the second horizontal portion and extends vertically.

[0016]

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

[10] , wherein the second horizontal portion extends closer to the core wire side power supply portion, and the second element forms a half loop shape.

[0017]

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

[10] , wherein the second horizontal portion extends away from the core wire side power supply portion.

[0018]

[13] The vehicle window glass of any one of [1] to

[12] , wherein the second horizontal portion has two open ends.

[0019]

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

[13] , wherein the second element connects the core wire side power supply portion and the first horizontal portion and has a second vertical portion extending vertically.

[0020]

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

[14] , wherein the ground side element has a third horizontal portion extending horizontally.

[0021]

[16] The vehicle window glass according to

[15] , wherein the third horizontal portion is capacitively coupled to the metal portion.

[0022]

[17] The vehicle window glass of

[15] , wherein the third horizontal portion is positioned farther from the metal portion in the vertical direction than the first horizontal portion.

[0023]

[18] The vehicle window glass of

[17] , wherein the ground side element includes a fifth horizontal portion extending parallel to the third horizontal portion.

[0024]

[19] The vehicle window glass according to

[18] , wherein the ground side element has at least one loop element.

[0025]

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

[19] , wherein the length L3 of the grounding element satisfies (0.033×λ×k)≦L3≦(0.25×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.

[0026]

[21] A vehicle window glass according to any one of [1] to [3], [7] to

[16] , and

[20] , wherein the ground-side power supply portion is positioned closer to the metal portion in the vertical direction than the core-side power supply portion.

[0027]

[22] A vehicle window glass according to any one of [1], [4] to

[15] , and

[17] to

[21] , wherein the core wire side power supply portion is positioned closer to the metal portion in the vertical direction than the ground side power supply portion.

[0028]

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

[22] , wherein the antenna is capable of receiving radio waves in the frequency band of terrestrial digital television broadcast waves.

[0029]

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

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

[0030]

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

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

[0031]

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

[25] , wherein the glass plate includes at least one of a windshield, a side glass, and a rear glass. [Effects of the Invention]

[0032] According to the present invention, a vehicle window glass is compact and does not obstruct visibility, yet provides sufficient antenna reception sensitivity. [Brief explanation of the drawings]

[0033] [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. 3 is a diagram showing antenna characteristics in Example 1 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. [Figure 5] 10A and 10B are diagrams showing examples of antenna patterns on a vehicle window glass according to a third embodiment. [Figure 6] FIG. 10 is a diagram showing an example of an antenna pattern on a vehicle window glass according to a fourth embodiment. [Figure 7] FIG. 10 is an external view showing an example of a vehicle window glass according to a fifth embodiment. [Figure 8] FIG. 10 is a diagram showing an example of an antenna pattern on a vehicle window glass according to a fifth embodiment. [Figure 9] FIG. 13 is a diagram showing an example of an antenna pattern on a vehicle window glass according to a sixth embodiment. [Figure 10] FIG. 13 is a diagram showing an example of an antenna pattern on a vehicle window glass according to the seventh embodiment. [Figure 11] FIG. 13 is a diagram showing an example of an antenna pattern on a vehicle window glass according to the eighth embodiment. [Figure 12] FIG. 13 is a diagram showing an example of an antenna pattern on a vehicle window glass according to the ninth embodiment. [Figure 13] FIG. 20 is a diagram showing an example of an antenna pattern on a vehicle window glass according to a tenth embodiment. [Figure 14] FIG. 20 is a diagram showing antenna characteristics in Example 2 of the vehicle window glass according to the tenth embodiment. [Figure 15] FIG. 23 is a diagram showing an example of an antenna pattern on a vehicle window glass according to a modified example of the tenth embodiment. [Figure 16] FIG. 23 is a diagram showing antenna characteristics in Example 3 of a vehicle window glass according to a modified example of the tenth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0034] 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.

[0035] [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.

[0036] 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.

[0037] 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.

[0038] 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. The antennas 10-1 and 10-2 shown in FIG. 1 are configured with symmetrical patterns, for example, horizontally, about the center line CL1 of the glass plate 2. That is, the antenna 10-2 has a pattern that is a left-right mirror image of the antenna 10-1. Note that "symmetrical" here does not necessarily mean that the patterns of the 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 the antennas 10-1 and 10-2 both have the characteristics described below, they can be considered to be in the category of having symmetry. Here, the detailed configuration of the antenna 10-1 will be described with reference to FIG. 2.

[0039] 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 an area AR1 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.

[0040] The core-side power supply portion 11 is a power supply electrode on the core side (hot side). When the glass plate 2 is attached to a vehicle, the core-side power supply portion 11 is disposed at a distance D3 from the metal portion 3 extending in the longitudinal direction (vertical direction). Here, the distance D3 is, for example, 5 mm when the antenna 10 is disposed at the left or right end.

[0041] 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 includes a first element 12-1 and a second element 12-2. The core-side element 12 is arranged to be connected to the core-side feeding portion 11.

[0042] The first element 12-1 is electrically connected to the core-side feeding portion 11 and extends in the horizontal direction. The length L1 of the first element 12-1 should satisfy the following formula (1a): 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.

[0043] (0.033×λ×k)≦L1≦(0.36×λ×k)...Equation (1a)

[0044] 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, 7 mm to 115 mm (7 mm≦L1≦115 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, 9 mm to 161 mm (9 mm≦L1≦161 mm).

[0045] Furthermore, the length L1 of the first element 12-1 preferably satisfies the formula (1b), and more preferably satisfies the formula (1c).

[0046] (0.16×λ×k)≦L1≦(0.34×λ×k)...Equation (1b) (0.27×λ×k)≦L1≦(0.30×λ×k)...Formula (1c)

[0047] In the example shown in FIG. 2, the length L1 of the first element 12-1 is, for example, 110 mm.

[0048] The second element 12-2 is electrically connected to the core-side feeding portion 11, surrounds the first element 12-1, and extends close to the metal part 3 of the vehicle. The second element 12-2 is arranged so as to surround the first element 12-1, including the metal parts 3 in the horizontal and vertical directions. Note that the antenna 10 may be arranged away from the metal parts 3 in the vertical direction (corners), as long as it is close to the metal parts 3 in the horizontal direction.

[0049] 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.

[0050] (0.50×λ×k)≦L2≦(0.90×λ×k)...Formula (2a)

[0051] 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 L2 of the second element 12-2 is, for example, 105 mm to 288 mm (105 mm≦L2≦288 mm). Note that when the vehicle window glass 1 is a single-pane glass or when 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 L2 of the second element 12-2 is, for example, 147 mm to 402 mm (147 mm≦L2≦402 mm).

[0052] Furthermore, the length L2 of the second element 12-2 preferably satisfies the formula (2b), and more preferably satisfies the formula (2c).

[0053] (0.59×λ×k)≦L2≦(0.84×λ×k)...Formula (2b) (0.67×λ×k)≦L2≦(0.79×λ×k)...Formula (2c)

[0054] In the example shown in FIG. 2, the length L2 of the second element 12-2 is, for example, 260 mm. The second element 12-2 includes a first horizontal portion 121, a second horizontal portion 122, a first vertical portion 123, and a second vertical portion .

[0055] The first horizontal portion 121 is located closer to the core-side feeding portion 11 than the metal portion 3 and extends in the horizontal direction. In this embodiment, the horizontal direction also includes the approximately horizontal direction. The approximately horizontal direction is, for example, within ±15 degrees with respect to the horizontal. The first horizontal portion 121 is connected to the core-side feeding portion 11 via the second vertical portion 124. The length L21 of the first horizontal portion 121 is, for example, 110 mm.

[0056] The second horizontal portion 122 is located near the metal portion 3, extends horizontally, and is capacitively coupled to the metal portion 3. The second horizontal portion 122 also extends closer to the core-side feeding portion 11, and the second element 12-2 forms a half-loop shape. That is, the second horizontal portion 122 extends from the first vertical portion 123 (described later) in the direction toward the ground-side feeding portion 13.

[0057] The length L22 of the second horizontal portion 122 should satisfy the formula (3a), 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.

[0058] (0.016×λ×k)≦L22≦(0.25×λ×k)...Equation (3a)

[0059] That is, the length L22 of the second horizontal portion 122 is, for example, 3 mm to 80 mm (3 mm≦L22≦80 mm) when the wavelength in air in the DTV band is λ=422 mm to 638 mm and k≈0.5 (when the wavelength shortening rate is when the antenna 10 is sealed inside the laminated glass). Note that 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 L22 of the second horizontal portion 122 is, for example, 4 mm to 112 mm (4 mm≦L22≦112 mm).

[0060] Furthermore, the length L22 of the second horizontal portion 122 preferably satisfies the formula (3b), and more preferably satisfies the formula (3c).

[0061] (0.033×λ×k)≦L22≦(0.23×λ×k)...Equation (3b) (0.050×λ×k)≦L22≦(0.21×λ×k)...Equation (3c)

[0062] In the example shown in FIG. 2, the length L22 of the second horizontal portion 122 is, for example, 30 mm. The distance D1 between the second horizontal portion 122 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. The distance D1 is, for example, 5 mm. The lower limit of the distance D1 may be 1 mm or more.

[0063] The first vertical portion 123 connects the first horizontal portion 121 and the second horizontal portion 122 and extends in the vertical direction. In this embodiment, the vertical direction also includes a substantially vertical direction. The substantially vertical direction is, for example, within ±15 degrees of the vertical direction. The length L23 of the first vertical portion 123 is, for example, 75 mm.

[0064] The second vertical portion 124 connects the core-side feeding portion 11 and the first horizontal portion 121 and extends in the vertical direction. The length L24 of the second vertical portion 124 is, for example, 25 mm. The second vertical portion 124 is not necessarily an essential component and may be provided arbitrarily. For example, the second vertical portion 124 may not be provided if a predetermined distance can be secured between the first horizontal portion 121 and the first element 12-1 in the vertical direction or if the length L2 satisfies the above formula. Furthermore, if the distance between the first horizontal portion 121 and the first element 12-1 is too close, the antenna characteristics may change, so the distance may be, for example, 20 mm or more.

[0065] In this embodiment, the length L2 of the second element 12-2 is the sum of the length L21 of the first horizontal portion 121, the length L22 of the second horizontal portion 122, the length L23 of the first vertical portion 123, and the length L24 of the second vertical portion 124 (L2 = L21 + L22 + L23 + L24).

[0066] The ground-side power supply portion 13 is a power supply electrode on the ground side (earth side). When the glass plate 2 is attached to a vehicle, the ground-side power supply portion 13 is arranged closer to the metal part 3 in the vertical direction (horizontal direction) than the core-wire-side power supply portion 11.

[0067] The ground element 14 is an antenna element on the ground side and is configured with a conductor pattern. The ground element 14 is disposed connected to the ground feeding portion 13.

[0068] The length L3 of the ground element 14 should satisfy the formula (4a) 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.

[0069] (0.033×λ×k)≦L3≦(0.25×λ×k)...Equation (4a)

[0070] That is, the length L3 of the ground-side element 14 is, for example, 7 mm to 80 mm (7 mm≦L3≦80 mm) 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). Note that 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 L3 of the ground-side element 14 is, for example, 9 mm to 112 mm (9 mm≦L3≦112 mm).

[0071] Furthermore, the length L3 of the ground side element 14 preferably satisfies the formula (4b), and more preferably satisfies the formula (4c).

[0072] (0.067×λ×k)≦L3≦(0.23×λ×k)...Formula (4b) (0.10×λ×k)≦L3≦(0.21×λ×k)...Equation (4c)

[0073] In the example shown in FIG. 2, the length L3 of the ground element 14 is, for example, 60 mm. The ground side element 14 has a third vertical portion 141 and a third horizontal portion 142. The third vertical portion 141 is not necessarily an essential component and may be provided optionally. For example, if the length L3 satisfies the above formula, the third vertical portion 141 does not need to be provided.

[0074] The third vertical portion 141 extends in the vertical direction and connects the ground-side feeding portion 13 and the third horizontal portion 142. The third vertical portion 141 has a length L31 of, for example, 10 mm. The third horizontal portion 142 extends in the horizontal direction. The third horizontal portion 142 is connected to the ground-side feeding portion 13 via the third vertical portion 141. The third horizontal portion 142 is capacitively coupled to the metal portion 3.

[0075] The length L32 of the third horizontal portion 142 is, for example, 10 mm to 80 mm. In the example shown in Fig. 2, the length L32 of the third horizontal portion 142 is, for example, 50 mm. Furthermore, the distance D2 between the third horizontal portion 142 and the metal portion 3 is 1 mm or more and 40 mm or less. The distance D2 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. The distance D2 is, for example, 5 mm. The lower limit of the distance D2 may be 1 mm or more. Furthermore, the distance D2 may be the same as or different from the distance D1.

[0076] In this embodiment, the length L3 of the ground side element 14 is the sum of the length L31 of the third vertical portion 141 and the length L32 of the third horizontal portion 142 (L3=L31+L32). 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.

[0077] 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 Example 1 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.

[0078] Here, the dimensions of the antenna 10 shown in FIG. 2 for obtaining Example 1 are as follows. Length of first element 12-1 L1: 110 [mm] Length L21 of the first horizontal portion 121: 130 [mm] Length L22 of the second horizontal portion 122: 30 [mm] Length L23 of the first vertical portion 123: 75 [mm] Length L24 of the second vertical portion 124: 25 [mm] Length of second element 12-2 L2: 260 [mm] Length of the third horizontal portion 142: L32: 50 [mm] Length L31 of the third vertical portion 141: 10 [mm] Length of ground element 14 L3: 60 [mm] Spacing D1: 5 [mm] Spacing D2: 5 [mm]

[0079] 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.

[0080] 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 electrically connected to the core-side feeding portion 11 and extending in the horizontal direction, and a second element 12-2 electrically connected to the core-side feeding portion 11 and extending to surround the first element 12-1 and approach a metal part 3 of the vehicle. The second element 12-2 includes a first horizontal portion 121 that is located closer to the core-side power supply portion 11 than the metal portion 3 and extends horizontally, and a second horizontal portion 122 that is located near the metal portion 3, extends horizontally, and is capacitively coupled to the metal portion 3.

[0081] As a result, in the vehicle window glass 1 of this embodiment, the antenna 10 has the second element 12-2 that surrounds the first element 12-1 and extends close to the metal part 3 of the vehicle, and the core element 12 includes the second horizontal part 122 that is capacitively coupled to the metal part 3, so that sufficient and stable antenna reception sensitivity can be obtained in the DTV band, for example, as shown in Fig. 3. Furthermore, because 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 has an antenna pattern that is different from that of conventional technology, so it is compact and does not obstruct the field of view, and sufficient antenna reception sensitivity can be obtained.

[0082] In this embodiment, the length L2 of the second element 12-2 satisfies the above formula (2a).

[0083] As a result, the vehicle window glass 1 of this embodiment can properly receive, by the second element 12-2, broadcast waves in the UHF band (Ultra High Frequency band) including the DTV band, etc. The UHF band is 300 MHz to 3 GHz (gigahertz).

[0084] In this embodiment, the distance D1 between the second horizontal portion 122 and the metal portion 3 is not less than 1 mm and not more than 40 mm. As a result, the vehicle window glass 1 of this embodiment can appropriately achieve capacitive coupling between the second element 12-2 and the metal part 3, thereby achieving sufficient antenna reception sensitivity.

[0085] In this embodiment, the length L1 of the first element 12-1 satisfies the above formula (1a).

[0086] 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 first element 12-1.

[0087] In this embodiment, the length L22 of the second horizontal portion 122 satisfies the above formula (3a).

[0088] As a result, the vehicle window glass 1 of this embodiment can appropriately achieve capacitive coupling between the metal portion 3 and the second horizontal portion 122, thereby achieving sufficient antenna reception sensitivity.

[0089] In this embodiment, the second element 12-2 has a first vertical portion 123 that connects the first horizontal portion 121 and the second horizontal portion 122 and extends in the vertical direction. The second horizontal portion 122 extends closer to the core-side feeding portion 11, and the second element 12-2 forms a half-loop shape.

[0090] As a result, the vehicle window glass 1 of this embodiment can appropriately capacitively couple the metal portion 3 and the second horizontal portion 122 via the first vertical portion 123.

[0091] In this embodiment, the second element 12-2 may have a second vertical portion 124 that connects the core-side feeding portion 11 and the first horizontal portion 121 and extends in the vertical direction. As a result, the vehicle window glass 1 of this embodiment can make the pattern of the second element 12-2 compact while ensuring an appropriate length L2 of the second element 12-2.

[0092] In this embodiment, the length L3 of the ground-side element 14 satisfies the above formula (4a). The ground-side feeding portion 13 is disposed closer to the metal portion 3 than the core-side feeding portion 11 in the vertical direction.

[0093] As a result, the vehicle window glass 1 of this embodiment can properly receive, by the ground element 14, broadcast waves in the UHF band including the DTV band, for example.

[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 12a, a ground-side feeding portion 13, and a ground-side element 14, 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 core side element 12 will be described.

[0102] In this embodiment, the core element 12a includes a first element 12-1 and a second element 12-2a. The second element 12-2a is electrically connected to the core-side feeding portion 11, surrounds the first element 12-1, and extends close to the vehicle's metal parts 3. The second element 12-2a is arranged to surround the first element 12-1, including the metal parts 3 in the horizontal and vertical directions.

[0103] The second element 12-2a includes a first horizontal portion 121, a second horizontal portion 122a, a first vertical portion 123, and a second vertical portion 124. As in the first embodiment, the second vertical portion 124 is not necessarily an essential component and may be provided optionally. The length L2 of the second element 12-2a is the same as in the first embodiment. The length L2 of the second element 12-2a is the sum of the length L21 of the first horizontal portion 121, the length L22 of the second horizontal portion 122a, the length L23 of the first vertical portion 123, and the length L24 of the second vertical portion 124 (L2 = L21 + L22 + L23 + L24).

[0104] In this embodiment, the second horizontal portion 122a extends in the horizontal direction so as to move away from the core-side feeding portion 11. That is, the second horizontal portion 122a extends in the opposite direction to the second horizontal portion 122 of the first embodiment. 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.

[0105] 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 12a, the ground-side feeding portion 13, and the ground-side element 14. The core-side element 12a includes the first element 12-1 and the second element 12-2a. The second element 12-2a includes the first horizontal portion 121, the second horizontal portion 122a, the first vertical portion 123, and the second vertical portion 124. The second horizontal portion 122a extends in the horizontal direction so as to move away from the core-side feeding portion 11.

[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] [Third embodiment] Next, a vehicle window glass 1b according to a third embodiment will be described with reference to the drawings. In the third embodiment, another modified example of the pattern of the antenna 10b provided on the vehicle window glass 1b will be described. As in the first embodiment, the vehicle window glass 1b includes a plurality of antennas 10b, and the plurality of antennas 10b are diversity antennas with symmetrical patterns.

[0108] FIG. 5 is a diagram showing an example of a pattern of an antenna 10b on a vehicle window glass 1b according to the third embodiment. As shown in FIG. 5, the antenna 10b-1 (10b) includes a core-side feeding portion 11, a core-side element 12b, a ground-side feeding portion 13, and a ground-side element 14, which are provided on the glass plate 2.

[0109] 5, 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 core side element 12 in Fig. 2 will be described.

[0110] In this embodiment, the core element 12b includes a first element 12-1 and a second element 12-2b. The second element 12-2b is electrically connected to the core-side feeding portion 11, surrounds the first element 12-1, and extends close to the metal portion 3 of the vehicle.

[0111] The second element 12-2b includes a first horizontal portion 121a, a second horizontal portion 122b, a first vertical portion 123, and a second vertical portion 124. As in the first embodiment, the second vertical portion 124 is not necessarily an essential component and may be provided optionally. The length L2 of the second element 12-2b is the same as in the first embodiment (L2 = L21 + L22 + L23 + L24). That is, in this embodiment, the length L22 of the second horizontal portion 122 corresponds to a portion of the second horizontal portion 122b and the first vertical portion 123, i.e., the length from the connection point of the second horizontal portion 122b to one open end of the second horizontal portion 122b.

[0112] In this embodiment, the second horizontal portion 122b has two open ends. Note that in Fig. 5, the length L22 of the second horizontal portion 122 is the length from the connection point between the first vertical portion 123 and the second horizontal portion 122b to the open end of the second horizontal portion 122b that is closer to the core-side power supply unit 11. However, the length L22 of the second horizontal portion 122 may be the length from the connection point between the first vertical portion 123 and the second horizontal portion 122b to the open end of the second horizontal portion 122b that is farther from the core-side power supply unit 11. 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.

[0113] As described above, the vehicle window glass 1b of this embodiment includes a glass plate 2 and an antenna 10b. The antenna 10b (for example, antenna 10b-1) is provided on the glass plate 2 and has a core-side feeding portion 11, a core-side element 12b, a ground-side feeding portion 13, and a ground-side element 14. The core-side element 12b includes a first element 12-1 and a second element 12-2b. The second element 12-2b includes a first horizontal portion 121a, a second horizontal portion 122b, a first vertical portion 123, and a second vertical portion 124. The second horizontal portion 122b has two open ends.

[0114] As a result, the vehicle window glass 1b 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.

[0115] [Fourth embodiment] Next, a vehicle window glass 1c according to a fourth embodiment will be described with reference to the drawings. In the fourth embodiment, another modified example of the pattern of the antenna 10c provided on the vehicle window glass 1c will be described. As in the first embodiment, the vehicle window glass 1c includes a plurality of antennas 10c, and the plurality of antennas 10c are diversity antennas with symmetrical patterns.

[0116] FIG. 6 is a diagram showing an example of a pattern of an antenna 10c on a vehicle window glass 1c according to the fourth embodiment. As shown in FIG. 6, the antenna 10c-1 (10c) 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.

[0117] 6, 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 ground side element 14 in Fig. 2 will be described.

[0118] 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 is arranged and connected to the ground-side power supply portion 13. The ground-side element 14a (an example of a third horizontal portion) does not have the above-mentioned third vertical portion 141 and extends horizontally from the ground-side power supply portion 13.

[0119] The length L3 of the ground side element 14a satisfies the above formula (4a). That is, the length L3 of the ground side element 14a is, for example, 10 mm to 110 mm (10 mm≦L3≦110 mm). In the example shown in FIG. 6, the length L3 of the ground side element 14a is, for example, 60 mm.

[0120] Furthermore, the ground element 14 a is capacitively coupled to the metal part 3 . The distance D2 between the ground element 14a and the metal part 3 is 1 mm or more and 40 mm or less. The distance D2 is, for example, 5 mm. 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.

[0121] As described above, the vehicle window glass 1c of this embodiment includes the glass plate 2 and the antenna 10c. The antenna 10c (for example, the antenna 10c-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 third vertical portion 141 and extends horizontally from the ground-side feeding portion 13.

[0122] As a result, the vehicle window glass 1c 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.

[0123] [Fifth embodiment] FIG. 7 is an external view showing an example of a vehicle window glass 1d according to the fifth embodiment. As shown in FIG. 7, a vehicle window glass 1d is a glass that is attached to a vehicle such as an automobile, and includes a glass plate 2 and a plurality of antennas 20.

[0124] The antenna 20 is, for example, an antenna capable of receiving the DTV band, and is configured by arranging a conductor such as metal on the glass plate 2. The antenna 20 is a diversity antenna in which multiple antennas are arranged on one glass plate 2, but only one antenna may be arranged on the glass plate 2.

[0125] In this embodiment, two antennas 20, antenna 20-1 and antenna 20-2, are arranged on the upper part of the glass plate 2, and the two antennas 20 (20-1, 20-2) have symmetrical patterns. Antenna 20-1 and antenna 20-2 shown in FIG. 7 are configured, for example, with symmetrical patterns in the left-right direction (horizontal direction) around the center line CL1 of the glass plate 2. Note that the description of the first embodiment can be applied to the term "symmetrical."

[0126] 8 is a diagram showing an example of a pattern of the antenna 20-1 (20) on the vehicle window glass of this embodiment, where FIG. 8 is an enlarged plan view of area AR1 in FIG. As shown in FIG. 8, the antenna 20-1 (20) includes a core-side feeding portion 21, a core-side element 22, a ground-side feeding portion 23, and a ground-side element 24, which are provided on the glass plate 2.

[0127] The core-side element 22 includes a first element 22-1 and a second element 22-2, which are connected to the core-side feeding portion 21. The first element 22-1 has a fourth horizontal portion 151 electrically connected to the core-side feeding portion 21 and extending horizontally, and a fourth vertical portion 152 connecting the core-side feeding portion 21 and the fourth horizontal portion 151, and extends toward the metal portion 3 of the vehicle. The second horizontal portion 162 and the fourth horizontal portion 151 are positioned on substantially the same line with a predetermined gap between them. The length L1 of the first element 22-1 preferably satisfies Equation (5a), where λ is the wavelength in air of radio waves in the frequency band received by the antenna 20, and k is the wavelength shortening rate of the glass plate 2.

[0128] (0.033×λ×k)≦L1≦(0.68×λ×k)...Equation (5a)

[0129] 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 22-1 is, for example, 7 mm to 217 mm (7 mm≦L1≦217 mm). Note that when the vehicle window glass 1 is a single-pane glass or when 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 22-1 is, for example, 9 mm to 304 mm (9 mm≦L1≦304 mm).

[0130] Furthermore, the length L1 of the first element 22-1 preferably satisfies the formula (5b), and more preferably satisfies the formula (5c). (0.10×λ×k)≦L1≦(0.56×λ×k) Formula (5b) (0.16×λ×k)≦L1≦(0.45×λ×k) Formula (5c)

[0131] In the core side element 22, the fourth horizontal portion 151 is capacitively coupled to the metal portion 3. When the wavelength in air of radio waves in the frequency band received by the antenna 20 is λ and the wavelength shortening rate of the glass plate 2 is k, it is preferable that the length L51 of the fourth horizontal portion 151 satisfies formula (6a).

[0132] (0.067×λ×k)≦L51≦(0.56×λ×k)...Equation (6a)

[0133] That is, the length L51 of the fourth horizontal portion 151 is, for example, 14 mm to 179 mm (14 mm≦L51≦179 mm) when the wavelength in air in the DTV band is λ=422 mm to 638 mm and k≈0.5 (when the wavelength shortening rate is when the antenna 10 is sealed inside the laminated glass). Note that 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 L51 of the fourth horizontal portion 151 is, for example, 19 mm to 251 mm (19 mm≦L51≦251 mm).

[0134] Furthermore, the length L51 of the fourth horizontal portion 151 that is capacitively coupled with the metal portion 3 preferably satisfies the formula (6b), and more preferably satisfies the formula (5c).

[0135] (0.16×λ×k)≦L51≦(0.45×λ×k)...Formula (6b) (0.27×λ×k)≦L51≦(0.34×λ×k)...Equation (6c)

[0136] The second element 22-2 is electrically connected to the core-side power supply portion 21, includes a portion extending in a direction opposite to the direction in which the first element 22-1 extends, and approaches the metal portion 3 of the vehicle. That is, in Fig. 8, the first element 22-1 extends clockwise from the core-side power supply portion 21 as a starting point, while the second element 22-2 extends counterclockwise from the core-side power supply portion 21 as a starting point. Furthermore, the length L2 of the second element 22-2 should satisfy the above formula (2a), preferably the above formula (2b), and more preferably the above formula (2c).

[0137] The second element 22-2 includes a first horizontal portion 161, a second horizontal portion 162, and a first vertical portion 163. The first horizontal portion 161 is located closer to the core-side feeding portion 21 than the metal portion 3 and extends horizontally. The second horizontal portion 162 is located near the metal portion 3 and extends horizontally, capacitively coupling with the metal portion 3. The second horizontal portion 162 extends from the connection point with the first vertical portion 163 toward the core-side feeding portion 21, and the second element 22-2 forms a half-loop. The length L22 of the second horizontal portion 162 satisfies the above formula (3a), preferably the above formula (3b), and more preferably the above formula (3c). In addition to the first vertical portion 163, the second element 22-2 may also have the second vertical portion (not shown) of the first embodiment.

[0138] The distance D4 between the fourth horizontal portion 151 and the metal portion 3 is 1 mm or more and 40 mm or less. The distance D4 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. The distance D4 is, for example, 5 mm. The lower limit of the distance D4 may be 1 mm or more. The distance D1 between the second horizontal portion 162 and the metal portion 3 may satisfy the range described in the first embodiment. The distance D1 may be the same as or different from the distance D4. When the distances D1 and D4 are different, a portion of the second horizontal portion 162 and a portion of the fourth horizontal portion 151 may be arranged such that, when a vertical imaginary line is drawn, the imaginary line intersects with both the second horizontal portion 162 and the fourth horizontal portion 151. In other words, when the distances D1 and D4 are different, a portion of the second horizontal portion 162 and a portion of the fourth horizontal portion 151 may be arranged to overlap vertically.

[0139] 8 may further include one or more horizontal sections (not shown) extending in the horizontal direction in order to, for example, increase the reception sensitivity of horizontally polarized waves in a predetermined frequency band. The additional horizontal section (not shown) may be disposed between first horizontal section 161 and fourth horizontal section 151, connected to at least one of core-side feeding section 21 and fourth vertical section 152, extending in the horizontal direction toward first vertical section 163, and having an open end. The additional horizontal section (not shown) may be connected to core-side feeding section 21, disposed on the opposite side of first horizontal section 161 from fourth horizontal section 151, extending parallel to first horizontal section 161, and having an open end.

[0140] The ground-side element 24 is an element connected to the ground-side feeding portion 23, and has a third horizontal portion 171 extending in the horizontal direction. In the antenna 20 of this embodiment, the ground-side element 24 may or may not have a portion that is capacitively coupled with the metal portion 3, but since the core-side feeding portion 21 is arranged closer to the metal portion 3 in the vertical direction than the ground-side feeding portion 23, the ground-side element 24 is arranged in a position where it is not capacitively coupled with the metal portion 3.

[0141] [Sixth embodiment] Next, a vehicle window glass 1e according to a sixth embodiment will be described with reference to the drawings. In the sixth embodiment, a modified example of the pattern of the antenna 20a provided on the vehicle window glass 1e will be described. As in the fifth embodiment, the vehicle window glass 1e is provided with a plurality of antennas 20a, and the plurality of antennas 20a are diversity antennas having symmetrical patterns. Note that only one antenna 20a may be arranged on the glass plate 2 of the vehicle window glass 1e of this embodiment.

[0142] Fig. 9 is a diagram showing an example of the pattern of an antenna 20a of a vehicle window glass 1e according to a sixth embodiment. The antenna 20a-1 (20a) shown in Fig. 9 includes a core-side feeding portion 21, a core-side element 22, a ground-side feeding portion 23, and a ground-side element 24a, which are provided on a glass plate 2. In Fig. 9, the same components as those in Fig. 8 above are given the same reference numerals, and their description will be omitted. In this embodiment, a modified example of the pattern of the ground-side element 24a will be described.

[0143] In this embodiment, the ground-side element 24a includes a third horizontal portion 171 and a fifth horizontal portion 172 that is substantially parallel to the third horizontal portion 171. In FIG. 9 , the third horizontal portion 171 and the fifth horizontal portion 172 are both directly connected to the ground-side power supply unit 23. However, they may be connected via a lead element (not shown) that connects to the ground-side power supply unit 23 and extends in any direction. The length L71 of the third horizontal portion 171 and the length L72 of the fifth horizontal portion 172 may be the same or different. Furthermore, the ground-side element 24a is configured to form a half-loop element having a notch on the side of the ground-side power supply unit 23 opposite the metal portion 3. The ground-side element 24a may include at least one half-loop element and / or a closed-loop element, as in the embodiments described below.

[0144] [Seventh embodiment] Next, a vehicle window glass 1f according to a seventh embodiment will be described with reference to the drawings. In the seventh embodiment, a modified example of the pattern of the antenna 20b provided on the vehicle window glass 1f will be described. As in the fifth embodiment, the vehicle window glass 1f is provided with multiple antennas 20b, and the multiple antennas 20b are diversity antennas with symmetrical patterns. Note that only one antenna 20b may be arranged on the glass plate 2 of the vehicle window glass 1f of this embodiment.

[0145] Fig. 10 is a diagram showing an example of the pattern of an antenna 20b of a vehicle window glass 1f according to the seventh embodiment. The antenna 20b-1 (20b) shown in Fig. 10 includes a core-side feeding portion 21, a core-side element 22b, a ground-side feeding portion 23, and a ground-side element 24a, which are provided on the glass plate 2. In Fig. 10, the same components as those in Fig. 9 above are denoted by the same reference numerals, and their description will be omitted. In this embodiment, a modified example of the pattern of the core-side element 22b described above will be described.

[0146] In this embodiment, the first element 22-1b is similar to the first element 22-1a in the sixth embodiment, whereas the second element 22-2b includes a first horizontal portion 161, a second horizontal portion 162b, and a first vertical portion 163. The length L2 of the second element 22-2b is the same as in the sixth embodiment. The length L2 of the second element 22-2b is the sum of the length L61 of the first horizontal portion 161, the length L22 of the second horizontal portion 162b, and the length L63 of the first vertical portion 163 (L2 = L61 + L22 + L63).

[0147] In this embodiment, the second horizontal portion 162b extends in the horizontal direction so as to move away from the core-side feeding portion 21. That is, the second horizontal portion 162b extends in the opposite direction to the second horizontal portion 162 of the sixth embodiment. The other configurations of this embodiment are the same as those of the sixth embodiment described above, and therefore the description thereof will be omitted here.

[0148] [Eighth embodiment] Next, a vehicle window glass 1g according to an eighth embodiment will be described with reference to the drawings. In the eighth embodiment, a modified example of the pattern of the antenna 20c provided on the vehicle window glass 1g will be described. As in the fifth embodiment, the vehicle window glass 1g is provided with a plurality of antennas 20c, and the plurality of antennas 20c are diversity antennas having symmetrical patterns. Note that only one antenna 20c may be arranged on the glass plate 2 of the vehicle window glass 1g of this embodiment.

[0149] Fig. 11 is a diagram showing an example pattern of an antenna 20c of a vehicle window glass 1g according to an eighth embodiment. The antenna 20c-1 (20c) shown in Fig. 11 includes a core-side feeding portion 21, a core-side element 22c, a ground-side feeding portion 23, and a ground-side element 24a, which are provided on a glass plate 2. In Fig. 11, the same components as those in Fig. 9 above are denoted by the same reference numerals, and their description will be omitted. In this embodiment, a modified example of the pattern of the core-side element 22c described above will be described.

[0150] In this embodiment, the first element 22-1c is similar to the first element 22-1a in the sixth embodiment, whereas the second element 22-2c includes a first horizontal portion 161, a part of a second horizontal portion 162c, and a first vertical portion 163. The length L2 of the second element 22-2c is the same as in the sixth embodiment. The length L2 of the second element 22-2c is the sum (L2 = L61 + L22 + L63) of the length L61 of the first horizontal portion 161, the length L22 of a portion of the second horizontal portion 162c, and the length L63 of the first vertical portion 163. That is, in this embodiment, the length L22 corresponds to the length from the connection point between the first vertical portion 163 and the second horizontal portion 162c to one open end of the second horizontal portion 162c.

[0151] In this embodiment, the second horizontal portion 162c has two open ends. Note that in Fig. 11, the length L22 is the length from the connection point between the first vertical portion 163 and the second horizontal portion 162c to the open end of the second horizontal portion 162c that is closer to the core-side power supply portion 21. However, this is not limiting, and the length L22 may be the length from the connection point between the first vertical portion 163 and the second horizontal portion 162c to the open end of the second horizontal portion 162c that is farther from the core-side power supply portion 21. The other configurations of this embodiment are the same as those of the sixth embodiment described above, and therefore the description thereof will be omitted here.

[0152] [Ninth embodiment] Next, a vehicle window glass 1h according to a ninth embodiment will be described with reference to the drawings. In the ninth embodiment, a modified example of the pattern of the antenna 20d provided on the vehicle window glass 1h will be described. As in the fifth embodiment, the vehicle window glass 1h is provided with a plurality of antennas 20d, and the plurality of antennas 20d are diversity antennas having symmetrical patterns. Note that only one antenna 20d of the vehicle window glass 1h of this embodiment may be arranged on the glass plate 2.

[0153] Fig. 12 is a diagram showing an example pattern of an antenna 20d of a vehicle window glass 1h according to a ninth embodiment. The antenna 20d-1 (20d) shown in Fig. 12 includes a core-side feeding portion 21, a core-side element 22, a ground-side feeding portion 23, and a ground-side element 24b, which are provided on the glass plate 2. In Fig. 12, the same components as those in Figs. 8 and 9 are given the same reference numerals, and their description will be omitted. In this embodiment, a modified example of the pattern of the ground-side element 24b will be described.

[0154] In this embodiment, the ground-side element 24b includes a third horizontal portion 171, a fifth horizontal portion 172 that is substantially parallel to the third horizontal portion 171, and a fifth vertical portion 173. The fifth vertical portion 173 of the ground-side element 24b connects to the third horizontal portion 171 and the fifth horizontal portion 172 to form a closed-loop element. Note that the fifth vertical portion 173 connects to the ends of the third horizontal portion 171 and the fifth horizontal portion 172 (opposite the ground-side power supply unit 23), but it may also be connected before these ends, i.e., closer to the ground-side power supply unit 23 than these ends. Furthermore, the ground-side element 24b may form a half-loop element having a notch in one portion. Note that in this embodiment, the term "loop element" includes both the closed-loop element and the half-loop element described above.

[0155] [Tenth embodiment] Next, a vehicle window glass 1k according to a tenth embodiment will be described with reference to the drawings. In the tenth embodiment, a modified example of the pattern of the antenna 20e provided on the vehicle window glass 1k will be described. As in the fifth embodiment, the vehicle window glass 1k is provided with a plurality of antennas 20e, and the plurality of antennas 20e are diversity antennas having symmetrical patterns. Note that only one antenna 20e may be provided on the glass plate 2 of the vehicle window glass 1k of this embodiment.

[0156] Fig. 13 is a diagram showing an example pattern of an antenna 20e of a vehicle window glass 1k according to a tenth embodiment. The antenna 20e-1 (20e) shown in Fig. 13 includes a core-side feeding portion 21, a core-side element 22, a ground-side feeding portion 23, and a ground-side element 24c, which are provided on a glass plate 2. In Fig. 13, the same components as those in Fig. 12 above are given the same reference numerals, and their description will be omitted. In this embodiment, a modified example of the pattern of the ground-side element 24c will be described.

[0157] In this embodiment, the ground-side element 24c includes a third horizontal portion 171, a fifth horizontal portion 172 and a sixth horizontal portion 174 that are substantially parallel to the third horizontal portion 171, a fifth vertical portion 173, a sixth vertical portion 175, and a seventh vertical portion 176. In the ground-side element 24c, the fifth vertical portion 173 connects to the third horizontal portion 171 and the fifth horizontal portion 172, and the sixth vertical portion 175 and the seventh vertical portion 176 connect to the fifth horizontal portion 172 and the sixth horizontal portion 174, thereby constituting two closed-loop elements. The horizontal and vertical lengths of the two closed-loop elements may be the same or different. That is, in FIG. 13, the length L73 of the fifth vertical portion 173 and the length L75 of the sixth vertical portion 175 may be the same or different. In addition, in FIG. 13, the length L72 of the fifth horizontal portion 172 and the length L74 of the sixth horizontal portion 174 may be the same or different.

[0158] Furthermore, the sixth vertical portion 175 is connected to the ends (opposite the ground-side power supply unit 23) of the fifth horizontal portion 172 and the sixth horizontal portion 174, but may be connected before these ends, that is, closer to the ground-side power supply unit 23 than these ends. Furthermore, in Fig. 13, the ground-side element 24c has two closed-loop elements, but may have a cutout in part to form one or two half-loop elements.

[0159] Next, with reference to FIG. 14, the antenna characteristics of the vehicle window glass 1k of this embodiment will be described. Fig. 14 is a diagram showing antenna characteristics of Example 2 of the vehicle window glass 1k of this embodiment. Fig. 14 shows actual measured values ​​of antenna characteristics in the DTV band using the pattern of antenna 20-1e. Note that, since antenna 20e was placed on the outermost surface of the laminated glass, the wavelength shortening rate k was set to be approximately 0.7.

[0160] Here, the dimensions of the antenna 20e-1 shown in FIG. 13 for obtaining Example 2 are as follows. Length L61 of the first horizontal section 161: 130 [mm] Length L22 of the second horizontal portion 162: 30 [mm] Length of first vertical portion 163 L63: 80 [mm] Length of second element 22-2 L2: 240 mm Length L51 of the fourth horizontal section 151: 95 [mm] Length L52 of the fourth vertical portion 152: 65 [mm] Length of first element 22-1 L1: 160 [mm] Length of the third horizontal section 171: L71: 50 [mm] Length of the fifth horizontal section 172: L72: 50 [mm] Length L73 of the fifth vertical portion 173: 13 [mm] Length of the sixth horizontal section 174: L74: 50 [mm] Length of the sixth vertical section 175 L75: 15 [mm] Length of the seventh vertical section 176 L76: 15 [mm] Spacing D4:5 [mm] Spacing D1: 5 [mm]

[0161] 14, the vertical axis represents antenna gain [dBd] and the horizontal axis represents the frequency of the DTV band. Waveform W2 represents the measured values ​​of the antenna characteristics. As shown by the waveform W2, the vehicle window glass 1k 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 1k of this embodiment provides good antenna characteristics over a wide frequency band such as the DTV band.

[0162] Next, a vehicle window glass 1s that is a modification of the tenth embodiment will be described with reference to FIG.

[0163] 15 is a diagram showing an example of a pattern of an antenna 20f on a vehicle window glass 1s according to a modified example of the tenth embodiment. In the antenna 20f provided on the vehicle window glass 1s, the core-side element 22d has a plurality of horizontal auxiliary elements 153a to 153e between the first horizontal portion 161 and the fourth horizontal portion 151. The horizontal auxiliary elements 153a to 153e are connected to the core-side feeding portion 21 and the fourth vertical portion 152, extend in the horizontal direction, and form open ends. Furthermore, the distance D1 between the second horizontal portion 162 and the metal portion 3 is different from the distance D4 between the fourth horizontal portion 151 and the metal portion 3, and a portion of the second horizontal portion 162 and a portion of the fourth horizontal portion 151 overlap in the vertical direction.

[0164] The ground-side element 24d in the modified example has a seventh horizontal portion 177 that is connected to the ground-side feeding portion 23 and extends horizontally between the fifth horizontal portion 172 and the sixth horizontal portion 174. The ground-side element 24d in the modified example has three half-loop elements each having a notch.

[0165] Next, with reference to FIG. 16, the antenna characteristics of a vehicle window glass 1s that is a modification of the tenth embodiment will be described. Fig. 16 is a diagram showing antenna characteristics in Example 3 of a vehicle window glass 1s according to a modified example of the tenth embodiment. Fig. 16 shows actual measured values ​​of antenna characteristics in the DTV band using the pattern of antenna 20f. Note that, since antenna 20f was placed on the outermost surface of the laminated glass, the wavelength shortening rate k was set to approximately 0.7.

[0166] Here, the dimensions of the antenna 20f-1 shown in FIG. 15 to obtain Example 3 are as follows. Length L61 of the first horizontal section 161: 130 [mm] Length L22 of the second horizontal portion 162: 30 [mm] Length of first vertical portion 163 L63: 80 [mm] Length of second element L2: 240 mm Length L51 of the fourth horizontal section 151: 110 [mm] Length L52 of the fourth vertical portion 152: 65 [mm] Length of first element L1: 175 mm Length L53 of horizontal auxiliary elements 153a to 153e: 110 mm Length of the third horizontal section 171: L71: 50 [mm] Length of the fifth horizontal section 172: L72: 50 [mm] Length of the sixth horizontal section 174: L74: 45 mm Length of the seventh vertical section 176 L76: 15 [mm] Length of the seventh horizontal section 177 L75: 45 [mm] Distance D4: 11 [mm] Spacing D1: 5 [mm] Spacing D5a: 10[mm] Distance D5b: 12.5 [mm] Spacing D5c: 12.5[mm] Distance D5d: 11.5 [mm] Distance D5e: 13 [mm] Distance D5f: 10.5 [mm] Distance D6: 5.5 [mm] Spacing D7:6[mm]

[0167] 16, the vertical axis represents antenna gain [dBd] and the horizontal axis represents frequency in the DTV band, and waveform W3 represents the measured values ​​of the antenna characteristics. As shown in waveform W3, the vehicle window glass 1s 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 1s of this embodiment provides good antenna characteristics over a wide frequency band such as the DTV band.

[0168] 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 receivable frequency band of the antennas 10 (10a to 10c) and 20 (20a to 20f) is the DTV band, but this is not limiting. The receivable frequency band of the antennas 10 (10a to 10c) and 20 (20a to 20f) may be, for example, a frequency band of FM broadcast waves, a frequency band of DAB (Digital Audio Broadcast) broadcast waves, or the like.

[0169] In each of the above embodiments, the shapes of the core-side power feeding portions 11, 21 and the ground-side power feeding portions 13, 23 may be square, rectangular, or the like. Furthermore, the arrangement of the core-side power feeding portions 11, 21 and the ground-side power feeding portions 13, 23 is not limited to, for example, the arrangement shown in Fig. 2 and may be other arrangements. The core-side power feeding portions 11, 21 and the ground-side power feeding portions 13, 23 may be square electrodes with two opposing sides rotated approximately 45 degrees with respect to the horizontal and vertical directions, for example.

[0170] Furthermore, in each of the above embodiments, an example has been described in which the second element 12-2 (12-2a, 12-2b) includes the second vertical portion 124, but as described above, the core-side power supply portion 11 and the first horizontal portion 121 (121a) may be directly connected without including the second vertical portion 124.

[0171] In addition, in each of the above embodiments, the vehicle window glass 1 (1a to 1c, 1d to 1h, 1k, 1s) is a diversity antenna having two antennas 10 (10a to 10c), 20 (20a to 20f) as an example, but it may also be provided with three or more antennas 10 (10a to 10c), 20 (20a to 20e). Also, the vehicle window glass 1 (1a to 1c, 1d to 1h, 1k, 1s) may also be provided with a single antenna 10 (10a to 10c), 20 (20a to 20f).

[0172] In the first to third embodiments, the third horizontal portion 142 has one open end, but may have two open ends. The third horizontal portion 142 may extend in a direction away from the second horizontal portion 122 (122a, 122b). In the fifth to tenth embodiments, the fourth horizontal portion 151 has one open end, but may have two open ends.

[0173] Furthermore, in the above first to fourth embodiments, an example was described in which the distance D1 between the second horizontal portion 122 (122a, 122b) and the metal portion 3 and the distance D2 between the third horizontal portion 142 and the metal portion 3 were equal, but the distance D1 and the distance D2 may be different. Similarly, in the above fifth to tenth embodiments, an example was described in which the distance D1 between the second horizontal portion 162 (162b, 162c) and the metal portion 3 and the distance D4 between the fourth horizontal portion 151 and the metal portion 3 were equal, but the distance D1 and the distance D4 may be different. [Explanation of symbols]

[0174] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1k Vehicle window glass 2 glass plates 3 Metal parts 10, 10-1, 10-2, 10a, 10a-1, 10b, 10b-1, 10c, 10b-1, 20, 20-1, 20a, 20a-1, 20b, 20b-1, 20c, 20c-1, 20d, 20d-1, 20e, 20e-1, 20-2 antennas 11, 21 Core side power supply 12, 12a, 12b, 22, 22b, 22c Core element 12-1, 22-1, 22-1b, 22-1c First element 12-2, 12-2a, 12-2b, 22-2, 22-2b, 22-2c Second element 13, 23 Ground side power supply 14, 14a, 24 Ground element 121, 121a, 161 1st horizontal section 122, 122a, 122b, 162, 162b, 162c 2nd horizontal part 123, 163 1st vertical section 124 2nd vertical section 141 3rd vertical section 142, 171 3rd horizontal section 151 4th horizontal section 152 4th vertical section 172 5th horizontal section 173 5th vertical section 174 6th horizontal section 175 6th Vertical Section 176 7th Vertical Section 177 7th horizontal 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-side element includes a first element electrically connected to the core-side power supply portion and extending in a horizontal direction, and a second element electrically connected to the core-side power supply portion and extending to approach a metal part of the vehicle, the second element includes a first horizontal portion that is located closer to the core-side feeding portion than the metal portion and extends horizontally, and a second horizontal portion that is located closer to the metal portion and extends horizontally and is capacitively coupled to the metal portion, the ground-side element has a third horizontal portion extending in a horizontal direction and capacitively coupled to the metal portion; Vehicle window glass.

2. The second horizontal portion and the third horizontal portion are positioned on approximately the same straight line with a predetermined interval between them. The vehicle window glass according to claim 1.

3. The second element surrounds the first element and extends close to the metal portion. The vehicle window glass according to claim 1 or 2.

4. The length L1 of the first 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, (0.033 × λ × k) ≦ L1 ≦ (0.36 × λ × k), Satisfy the The vehicle window glass according to claim 3.

5. the first element includes a fourth horizontal portion extending in a horizontal direction and capacitively coupled to the metal portion; The vehicle window glass according to claim 1 or 2.

6. The length L1 of the first 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, (0.033 × λ × k) ≦ L1 ≦ (0.68 × λ × k), Satisfy the The vehicle window glass according to claim 5.

7. The vehicle window glass according to claim 5, wherein the second horizontal portion and the fourth horizontal portion are positioned on substantially the same straight line with a predetermined gap therebetween.

8. 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-side element includes a first element electrically connected to the core-side power supply portion and extending in a horizontal direction, and a second element electrically connected to the core-side power supply portion and extending to approach a metal part of the vehicle, the second element includes a first horizontal portion that is located closer to the core-side feeding portion than the metal portion and extends horizontally, and a second horizontal portion that is located closer to the metal portion and extends horizontally and is capacitively coupled to the metal portion, the first element includes a fourth horizontal portion extending in a horizontal direction and capacitively coupled to the metal portion; The second horizontal portion and the fourth horizontal portion are positioned on substantially the same straight line with a predetermined interval therebetween. Vehicle window glass.

9. The length L2 of the second 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, (0.50 × λ × k) ≦ L2 ≦ (0.90 × λ × k), Satisfy the The vehicle window glass according to any one of claims 1, 2 and 8.

10. The distance between the second horizontal portion and the metal portion is 1 mm or more and 40 mm or less. The vehicle window glass according to any one of claims 1, 2 and 8.

11. The length L22 of the second horizontal portion is, when the wavelength in the air of the radio wave of the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, (0.016 × λ × k) ≦ L22 ≦ (0.25 × λ × k), Satisfy the The vehicle window glass according to any one of claims 1, 2 and 8.

12. the second element has a first vertical portion that connects the first horizontal portion and the second horizontal portion and extends in a vertical direction; The vehicle window glass according to any one of claims 1, 2 and 8.

13. the second horizontal portion extends toward the core-side feeding portion, and the second element forms a half-loop shape; The vehicle window glass according to any one of claims 1, 2 and 8.

14. the second horizontal portion extends away from the core-side feeding portion; The vehicle window glass according to any one of claims 1, 2 and 8.

15. the second horizontal portion has two open ends; The vehicle window glass according to any one of claims 1, 2 and 8.

16. the second element has a second vertical portion that connects the core-side feeding portion and the first horizontal portion and extends in a vertical direction; The vehicle window glass according to any one of claims 1, 2 and 8.

17. The ground side element has a third horizontal portion extending horizontally, The vehicle window glass according to claim 8 , wherein the third horizontal portion is disposed farther from the metal portion in the vertical direction than the first horizontal portion.

18. The ground side element includes a fifth horizontal portion extending parallel to the third horizontal portion.

18. A vehicle glazing according to claim 17.

19. The ground element has at least one loop element.

19. A vehicle glazing according to claim 18.

20. The length L3 of the ground side element is, 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, (0.033 × λ × k) ≦ L3 ≦ (0.25 × λ × k), Satisfy the The vehicle window glass according to any one of claims 1, 2 and 8.

21. the ground-side power supply portion is disposed closer to the metal portion in the vertical direction than the core-side power supply portion; The vehicle window glass according to any one of claims 1, 2 and 8.

22. the core-side power supply portion is disposed closer to the metal portion in the vertical direction than the ground-side power supply portion; The vehicle window glass according to any one of claims 1, 2 and 8.

23. The antenna is capable of receiving radio waves in the frequency band of terrestrial digital television broadcast waves. The vehicle window glass according to any one of claims 1, 2 and 8.

24. The antenna is a diversity antenna arranged in plurality on one of the glass plates, and the plurality of antennas have symmetrical patterns. The vehicle window glass according to any one of claims 1, 2 and 8.

25. The antenna is a diversity antenna arranged in plurality on one of the glass plates, and the plurality of antennas have asymmetric patterns. The vehicle window glass according to any one of claims 1, 2 and 8.

26. The glass plate includes at least one of a windshield, a side glass, and a rear glass. The vehicle window glass according to any one of claims 1, 2 and 8.

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