Vehicle window glass

Abstract

To provide a window glass for a vehicle, capable of receiving an electromagnetic wave of a predetermined frequency band by a sufficient antenna gain.SOLUTION: A window glass for a vehicle 101, includes an antenna 31 that includes: a power supply element 10 that is formed on a glass plate 40, and is connected to a power supply electrode H; and a ground element 20 connected to a ground electrode G. In a flat surface view of the glass plate 40, when a region of the glass plate 40 that is orthogonal to a metal part end side 51 corresponded to a boundary of the metal part 50 and the glass plate 40 of a vehicle mostly contacted to the antenna 31, and is on the power supply electrode H side to a virtual boundary line B passing through a center of an interval of the power supply electrode H and the ground electrode F is a first region, and a region of the glass plate 40 on the ground electrode G side to the virtual boundary line B is a second region 2, the power supply element 10 includes a first power supply element 11 that is extended to the second region 2, is positioned on the metal part 50 side from the ground electrode G and the ground element 20, and performs a capacitive coupling with the metal part 50.SELECTED DRAWING: Figure 1

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 frequency bands, such as AM broadcast waves, FM broadcast waves, European standard DAB (Digital Audio Broadcast) broadcast waves, terrestrial digital television broadcast waves, etc. For example, Patent Document 1 discloses that a glass antenna for receiving terrestrial digital TV broadcast waves is formed on an automobile window glass, and that antenna reception sensitivity is obtained in a predetermined frequency band (470 MHz to 710 MHz). [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] The area occupied by an antenna mounted on a vehicle window glass varies depending on the frequency band, but a compact pattern is preferred so as not to obstruct the view through the window glass opening. Furthermore, the antenna mounted on a vehicle window glass is required to achieve a desired antenna gain in a predetermined frequency band.

[0005] The present invention provides a vehicle window glass that can receive radio waves in a predetermined frequency band with sufficient antenna gain. [Means for solving the problem]

[0006] In one aspect of the present disclosure, A glass plate and an antenna formed on the glass plate, the antenna having a feeding electrode, a feeding element connected to the feeding electrode, and a ground electrode, and a ground element connected to the ground electrode; In a plan view of the glass sheet, an imaginary boundary line is defined that is perpendicular to an edge of a metal part of the vehicle that is closest to the antenna and corresponds to a boundary between the glass sheet and the metal part, and that passes through the center of the gap between the feed electrode and the ground electrode; a region of the glass sheet that is on the feed electrode side with respect to the imaginary boundary line is defined as a first region, and a region of the glass sheet that is on the ground electrode side with respect to the imaginary boundary line is defined as a second region, The vehicle window glass is provided, wherein the power supply element has a first power supply element that extends into the second region, is positioned closer to the metal portion than the ground electrode and the ground element, and is capacitively coupled to the metal portion. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, a vehicle window glass can receive radio waves in a predetermined frequency band with sufficient antenna gain. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view showing an example of the configuration of a vehicle window glass according to a first embodiment. [Figure 2] FIG. 6 is a plan view showing an example of the configuration of a vehicle window glass according to a second embodiment. [Figure 3] FIG. 10 is a plan view showing an example of the configuration of a vehicle window glass according to a third embodiment. [Figure 4] FIG. 10 is a plan view showing an example of the configuration of a vehicle window glass according to a fourth embodiment. [Figure 5] FIG. 10 is a plan view showing an example of the configuration of a vehicle window glass according to a fifth embodiment. [Figure 6] FIG. 10 is a plan view showing an example of the configuration of a vehicle window glass according to a sixth embodiment. [Figure 7] FIG. 13 is a plan view showing an example of the configuration of a vehicle window glass according to a seventh embodiment. [Figure 8]FIG. 13 is a plan view showing an example of the configuration of a vehicle window glass according to an eighth embodiment. [Figure 9] 1(a) is a plan view showing an antenna pattern of a vehicle window glass in Example 1. FIG. 1(b) is a plan view showing an antenna pattern of a vehicle window glass in Example 2. FIG. [Figure 10] 10(a) is a plan view showing an antenna pattern of a vehicle window glass in Example 3. FIG. 10(b) is a plan view showing an antenna pattern of a vehicle window glass in Example 4. FIG. [Figure 11] 1 shows the results of the antenna performance of the vehicle window glass of Examples 1 to 4. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. Note that for ease of understanding, the scale of each part in the drawings may differ from the actual scale. Directions such as parallel, right-angled, orthogonal, horizontal, vertical, up-down, and left-right are permissible to the extent that they do not impair the effects of the embodiments. The shape of the corners is not limited to right angles and may be rounded like an arch. Parallel, right-angled, horizontal, and vertical may include approximately parallel, approximately right-angled, approximately orthogonal, approximately horizontal, and approximately vertical. The direction parallel to the X-axis direction (X-axis direction) and the direction parallel to the Y-axis (Y-axis direction) represent the left-right direction (horizontal direction) and the up-down direction (vertical direction) of the glass plate, respectively. The X-axis and Y-axis directions are perpendicular to each other.

[0010] (First embodiment) Fig. 1 is a plan view showing a specific example of a vehicle window glass according to the first embodiment. The vehicle window glass 101 shown in Fig. 1 has an antenna 31 formed on a main surface of a glass plate 40 attached to a metal part 50 of a vehicle. The glass plate 40 is, for example, a windshield, and the outer periphery of the glass plate 40 is attached to the vehicle body, i.e., the metal part 50, with an adhesive such as urethane resin. The metal part 50 is also called a metal flange. The glass plate 40 includes at least one of a windshield, a side glass, and a rear glass.

[0011] The glass plate 40 may be provided with a light-shielding film (not shown) that blocks visible light in the peripheral portion in a plan view. In this case, the glass plate 40 has a light-shielding region with the light-shielding film and a transparent region inside the light-shielding region that transmits visible light. Specific examples of the light-shielding film include ceramics such as a black ceramic film. In the vehicle window glass 101, at least a portion of the antenna 31 overlaps with the light-shielding film, making the antenna 31 less visible in the transparent region and improving the design of the vehicle window glass 101.

[0012] The antenna 31 shown in FIG. 1 is a so-called dipole antenna having a pair of electrodes, a feeding electrode H and a ground electrode G. The antenna 31 has a feeding element 10 connected to the feeding electrode H and a ground element 20 connected to the ground electrode G. The feeding electrode H and the ground electrode G are connected to one end of a transmission line (not shown), and the other end of the transmission line is connected to a signal processing device such as an ECU (Electronic Control Unit) that processes radio wave signals of a predetermined frequency band received by the antenna 31. A typical example of the transmission line is a coaxial cable, and in particular, the core wire of the coaxial cable is connected to the feeding electrode H, and the sheath wire (ground wire) of the coaxial cable is connected to the ground electrode G. The transmission line may be other than a coaxial cable; a stripline, a microstripline, a coplanar feed line, or the like may also be used.

[0013] Antenna 31 is configured to be able to receive radio waves in a predetermined frequency band and resonate at frequencies within that frequency band. For example, antenna 31 may be configured to receive horizontally polarized waves and radio waves in the UHF (Ultra High Frequency) band with a frequency of 300 MHz to 3 GHz. Radio waves in the UHF band include terrestrial digital television broadcast waves of 470 MHz to 710 MHz and radio waves in the L-band (1452 MHz to 1492 MHz) of the DAB standard. Antenna 31 may be configured to be able to receive vertically polarized waves, or may be configured to be able to receive both vertically polarized waves and horizontally polarized waves, or may be configured to be able to receive circularly polarized waves (right-handed polarized waves / left-handed polarized waves).

[0014] 1, the horizontal direction when the glass plate 40 is attached to the vehicle is defined as the X-axis direction, and the direction perpendicular to the X-axis direction on the surface of the glass plate 40 is defined as the Y-axis direction. In Fig. 1, the metal part 50 closest to the antenna 31, particularly the first feeding element 11 described below, extends in the horizontal direction, and the metal part edge 51 corresponding to the interface between the metal part 50 and the glass plate 40 extends in the approximately horizontal direction.

[0015] In the vehicle window glass 101 shown in FIG. 1, a power supply electrode H and a ground electrode G are arranged side by side at a predetermined interval in the approximately horizontal direction. Here, the "interval between the power supply electrode H and the ground electrode G" refers to the shortest distance between the power supply electrode H and the ground electrode G. The distance is not particularly limited, but examples include a range of 3 mm to 30 mm, or a range of 5 mm to 20 mm. As shown in FIG. 1, when a glass plate 40 is divided into two regions by an imaginary boundary line B that passes through the center of the distance between the power supply electrode H and the ground electrode G and is perpendicular to the metal portion edge 51, the region where the power supply electrode H is arranged is defined as a first region 1, and the region where the ground electrode G is arranged is defined as a second region 2. The power supply element 10 connected to the power supply electrode H extends from the first region 1 to the second region 2, crossing the imaginary boundary line B. The power supply electrode H and the ground electrode G may be arranged diagonally at a predetermined angle from the horizontal direction (X-axis direction), or they may be arranged in any direction.

[0016] Specifically, the feeding element 10 of the antenna 31 extends substantially parallel to the metal portion edge 51 and forms an L-shaped element. The first feeding element 11 is capacitively coupled to the metal portion 50, and the second feeding element 12 connects the feeding electrode H and the first feeding element 11. The bending angle of the L-shaped element is not limited to a right angle, and it may be bent at an angle deviated from a right angle or include a partial curve. In particular, the vehicle window glass 101 shown in FIG. 1 has a first direction that is substantially perpendicular to the glass sheet 40 toward the metal portion edge 51, and a second direction that is substantially perpendicular to the imaginary boundary line B from the first region 1 to the second region. Furthermore, the third direction is a direction facing the opposite side to the first direction, and the fourth direction is a direction facing the opposite side to the second direction. However, the first, second, third, and fourth directions are not limited to being aligned with the X-axis or Y-axis directions as shown in FIG. 1, and some angular deviation is acceptable.

[0017] In the vehicle window glass 101 shown in FIG. 1 , the power supply element 10 forms an L-shaped element with a second power supply element 12 extending in a first direction from the power supply electrode H and a first power supply element 11 connecting to a portion near an end of the second power supply element 12 and extending in the second direction. The first power supply element 11 crosses the imaginary boundary line B and extends into the second region 2, with its tip end being an open end. Furthermore, the first power supply element 11 may be disposed between the metal part 50 and the ground electrode G, with its open end extending further in the second direction than the ground electrode G (farther from the imaginary boundary line B).

[0018] The first power supply element 11 may be capacitively coupled to the metal portion 50, and the distance therebetween may be 30 mm or less. The distance between the first power supply element 11 and the metal portion 50 may be defined as the distance in a planar view of the glass plate 40, or the shortest distance between them. The distance at which the first power supply element 11 and the metal portion 50 are capacitively coupled is preferably 20 mm or less, more preferably 15 mm or less, even more preferably 10 mm or less, and particularly preferably 7 mm or less. There is no particular lower limit to the distance as long as they are separated, but an example of the lower limit is 1 mm or more. The first power supply element 11 is located closer to the metal portion 50 (first direction side) than the ground electrode G and the ground element 20. There is no other conductor between the first power supply element 11 and the metal portion 50. In this way, the first power supply element 11 is capacitively coupled to the metal portion 50, thereby improving the receiving sensitivity of the antenna, especially over a wide frequency band. Furthermore, by capacitively coupling the first feeding element 11 with the metal part 50, an element other than the first feeding element can be added and its length and extension direction adjusted, thereby further improving the antenna sensitivity in the frequency band.

[0019] In the vehicle window glass 101 according to this embodiment, the length of the first power supply element 11 that is capacitively coupled to the metal part 50 is set to L H1 where λ is the central wavelength in air of the frequency band received by antenna 31, and k is the wavelength shortening rate of glass plate 40, it is sufficient to satisfy formula (1a), preferably formula (1b), and more preferably formula (1c). When glass plate 40 is a single plate, k is approximately 0.7, and when glass plate 40 is a laminated glass in which an interlayer such as a resin film is sandwiched between two sheets of glass, k is approximately 0.5, for example.

[0020] 0.07×λ×k ≦ L H1 ≦ 0.98×λ×k (1a) 0.15×λ×k ≦ L H1 ≦ 0.59×λ×k (1b) 0.23×λ×k ≦ L H1 ≦ 0.30×λ×k (1c)

[0021] In addition, in the vehicle window glass 101 according to this embodiment, the length of the second power supply element 12 is set to L H2 When the length of the feeding element 10 (L H1 +L H2 ) is sufficient if it satisfies the formula (2a), preferably if it satisfies the formula (2b), and more preferably if it satisfies the formula (2c).

[0022] 0.07×λ×k ≦ L H1 +L H2 ≦ 1.02×λ×k (2a) 0.15×λ×k ≦ L H1 +L H2 ≦ 0.63×λ×k (2b) 0.23×λ×k ≦ L H1 +L H2 ≦ 0.34×λ×k (2c)

[0023] Furthermore, the vehicle window glass 101 shown in FIG. 1 has a ground element 20 electrically connected to the ground electrode G, and in particular, the ground element 20 has a first ground element 21 extending in the second direction. That is, the ground electrode G and the ground element 20 are both arranged in the second region. The first ground element 21 extends from the ground electrode G in the second direction and has an open end at its tip. The first ground element 21 is arranged on the opposite side (third direction side) of the first power supply element 11 from the metal part 50.

[0024] In addition, in the vehicle window glass 101 according to this embodiment, the length of the first ground element 21 is set to L G1 In this case, it is sufficient to satisfy the formula (3a), it is preferable to satisfy the formula (3b), and it is even more preferable to satisfy the formula (3c).

[0025] 0.07×λ×k ≦ L G1 ≦ 1.19×λ×k (3a) 0.15×λ×k ≦ L G1 ≦ 0.79×λ×k (3b) 0.23×λ×k ≦ LG1 ≦ 0.48×λ×k (3c)

[0026] (Second embodiment) 2 is a plan view showing a specific example of a vehicle window glass according to the second embodiment. Descriptions of the second embodiment that are similar to those of the above-described embodiments in terms of configuration and effects will be omitted or simplified by incorporating the above-described descriptions.

[0027] In the vehicle window glass 102 shown in Fig. 2, the power feeding electrode H of the antenna 32 is disposed closer to the metal part 50 (first direction side) than the ground electrode G. That is, the power feeding electrode H and the ground electrode G are disposed side by side at a predetermined angle from the horizontal direction. The power feeding element 10 of the antenna 32 is formed by a first power feeding element 11, and the first power feeding element 11 is capacitively coupled to the metal part 50. The vehicle window glass 102 shown in Fig. 2 differs from the vehicle window glass according to the first embodiment in that it does not have a second power feeding element 12.

[0028] (Third embodiment) 3 is a plan view showing a specific example of a vehicle window glass according to the third embodiment. Descriptions of the third embodiment that are similar to those of the above-described embodiments in terms of configuration and effects will be omitted or simplified by incorporating the above-described descriptions.

[0029] 3, the antenna 33 includes a power supply element 10 having a third power supply element 13 that extends in the fourth direction from the junction between the first power supply element 11 and the second power supply element 12 and has an open end at its tip. That is, the power supply element 10 of the antenna 33 is connected to the power supply electrode H and forms a T-shaped element that is capacitively coupled with the metal part 50. The third power supply element 13 is disposed within the first region 1.

[0030] Furthermore, the third feeding element 13 extends in the fourth direction from the bending point of the L-shaped element formed by the first feeding element 11 and the second feeding element 12, but may extend in the fourth direction from a portion of the second feeding element 12 excluding both ends. In this way, the vehicle window glass 103 of this embodiment can increase the antenna sensitivity in at least a portion of the predetermined frequency band received by the antenna 33 by appropriately adjusting the length of the third feeding element 13.

[0031] (Fourth embodiment) 4 is a plan view showing a specific example of a vehicle window glass according to the fourth embodiment. Descriptions of the fourth embodiment that have the same configurations and effects as those of the above-described embodiments will be omitted or simplified by citing the above descriptions.

[0032] 4, the vehicle window glass 104 includes a ground element 20 in an antenna 34, the ground element 20 including a first ground element 21 and a second ground element 22 that is electrically connected to the ground electrode G, extends in the second direction, and has an open end at its tip. The second ground element 22 is located on the opposite side (third direction side) of the first ground element 21 from the metal part 50 side. The second ground element 22 may also be disposed parallel to the first ground element 21. The length of the second ground element 22 can be set arbitrarily, but may be shorter than the length of the first ground element 21.

[0033] 4, the second ground element 22 extends in the second direction from the ground electrode G, but may also extend in the second direction via a connecting element (not shown) that extends in the third direction from the ground electrode G. In this way, the vehicle window glass 104 of this embodiment can increase the antenna sensitivity in at least a portion of the predetermined frequency bands received by the antenna 34 by appropriately adjusting the length of the second ground element 22.

[0034] (Fifth embodiment) 5 is a plan view showing a specific example of a vehicle window glass according to Embodiment 5. Descriptions of the fifth embodiment that have the same configurations and effects as those of the above-described embodiments will be omitted or simplified by citing the above descriptions.

[0035] 5, the ground element 20 in the antenna 35 includes a first ground element 21, a fourth ground element 24 connected to the ground electrode G and extending in the third direction, a second ground element 22 connected to an end of the fourth ground element 24, extending in the second direction with an open end, and a third ground element 23 extending in the fourth direction with an open end. In this way, the second ground element 22, the third ground element 23, and the fourth ground element 24 form a T-shaped element.

[0036] The third ground element 23 is connected to the fourth ground element 24 and extends in the fourth direction, but may have an open end within the second region 2, or may cross the imaginary boundary line B from the second region 2 and have an open end in the first region 1. Furthermore, the third ground element 23 may extend further in the fourth direction than the feeding electrode H and have an open end. That is, in the vehicle window glass 105 of this embodiment, the feeding electrode H of the antenna 35 may be disposed between the metal part 50 and the third ground element 23 in the third direction (Y-axis direction).

[0037] Furthermore, the second ground element 22 or the third ground element 23 may extend from a portion excluding both ends of the fourth ground element 24. In this way, the vehicle window glass 105 of this embodiment can increase the antenna sensitivity in at least a portion of the predetermined frequency band received by the antenna 35 by appropriately adjusting the lengths of the second ground element 22, the third ground element 23, and the fourth ground element 24.

[0038] (Sixth embodiment) 6 is a plan view showing a specific example of a vehicle window glass according to the sixth embodiment. Descriptions of the sixth embodiment that have the same configurations and effects as those of the above-described embodiments will be omitted or simplified by citing the above descriptions.

[0039] 6, the vehicle window glass 106 includes an antenna 36 in which the ground element 20 includes a first ground element 21, a second ground element 22 connected to the ground electrode G and extending in the second direction with an open end at its tip, and a third ground element 23 connected to the ground electrode G and extending in the fourth direction with an open end at its tip. The third ground element 23 may have an open end within the second region 2, may intersect the imaginary boundary line B from the second region 2 with an open end in the first region 1, or may extend further in the fourth direction than the power supply electrode H and have an open end. In the vehicle window glass 106 of this embodiment, the power supply electrode H and the ground electrode G are arranged side by side at a predetermined angle from the horizontal direction.

[0040] In this way, the vehicle window glass 106 of this embodiment can increase the antenna sensitivity of at least some of the specified frequency bands received by the antenna 36 by appropriately adjusting the lengths of the second grounding element 22 and the third grounding element 23.

[0041] Seventh embodiment 7 is a plan view showing a specific example of a vehicle window glass according to the seventh embodiment. Descriptions of the seventh embodiment that have the same configurations and effects as those of the above-described embodiments will be omitted or simplified by citing the above descriptions.

[0042] 7, the antenna 37 includes a fourth power supply element 14, which is electrically connected to the power supply electrode H, extends in the fourth direction, and has an open end at its tip. The fourth power supply element 14 is disposed within the first region 1. In the vehicle window glass 107 shown in FIG. 7, the fourth power supply element 14 is connected to the power supply electrode H and extends in the fourth direction, but may also extend in the fourth direction via a connecting element (not shown) that extends from the power supply electrode H in the third direction, for example.

[0043] In this way, the vehicle window glass 107 of this embodiment can increase the antenna sensitivity of at least some of the predetermined frequency bands received by the antenna 37 by appropriately adjusting the length of the fourth feeding element 14.

[0044] (Eighth embodiment) 8 is a plan view showing a specific example of a vehicle window glass according to the eighth embodiment. Descriptions of the eighth embodiment that have the same configurations and effects as those of the above-described embodiments will be omitted or simplified by citing the above descriptions.

[0045] 8 includes a fourth power supply element 14 electrically connected to the power supply electrode H, extending in the fourth direction with an open end at its tip, and a fifth power supply element 15 electrically connected to the power supply electrode H, extending in the fourth direction with an open end at its tip, in an antenna 38. The fourth power supply element 14 and the fifth power supply element 15 are disposed within the first region 1.

[0046] 8, the fifth power supply element 15 extends in the fourth direction from the power supply electrode H. Alternatively, the fifth power supply element 15 may extend in the fourth direction via a connecting element (not shown) extending in the third direction from the power supply electrode H. The fifth power supply element 15 is located on the opposite side (third direction side) from the metal part 50 with respect to the fourth power supply element. The lengths of the fourth power supply element 14 and the fifth power supply element 15 can be set arbitrarily, but the fourth power supply element 14 may be longer than the fifth power supply element 15. The fifth power supply element 15 may be arranged parallel to the fourth power supply element 14.

[0047] In this way, the vehicle window glass 108 of this embodiment can increase the antenna sensitivity of at least some of the predetermined frequency bands received by the antenna 38 by appropriately adjusting the lengths of the fourth power supply element 14 and the fifth power supply element 15. [Example]

[0048] Next, for the vehicle window glass according to this embodiment, an antenna was formed on the windshield, which was to be laminated as a glass plate, and the antenna gain was measured. Figures 9(a) and 9(b) and 10(a) and 10(b) are plan views showing the specific configurations of vehicle window glasses 101, 104, 105, and 108, respectively, in Examples 1 to 4.

[0049] Fig. 11 shows the measurement results of the antenna gain of each antenna on the vehicle window glass in Examples 1 to 4. The vertical axis of Fig. 11 represents the antenna gain (unit: dBi), and the horizontal axis represents the frequency (unit: MHz), which is the range of 470 MHz to 710 MHz, which is the frequency band of terrestrial digital television broadcast waves.

[0050] Example 1 In Example 1, an antenna 31 was formed as a vehicle window glass 101. The dimensions of the antenna 31 are as follows, and are expressed in mm. The feeding electrode H and the ground electrode G were arranged so as to be aligned in the horizontal direction. The wavelength shortening rate k of the glass plate 40 was approximately 0.5, and this was also the case in Examples 2 to 4.

[0051] The length of the first power supply element 11 (H1=L H1 ):65 The length of the second power supply element 12 (H2=L H2 ):8 The length of the first ground element 21 (G1=L G1 ):85 Distance between metal end 51 and first power supply element 11 (F): 5 Distance between power supply electrode H and ground electrode G: 12 Size of power supply electrode H (width (X) x height (Y)): 10 x 18 Size of ground electrode G (width (X) x height (Y)): 13 x 18

[0052] Example 2 In Example 2, the antenna 34 was formed as a vehicle window glass 104. The dimensions of the antenna 34 are as follows, and the unit is "mm".

[0053] The length of the first power supply element 11 (H1=L H1 ):65 The length of the second power supply element 12 (H2=L H2 ):8 The length of the first ground element 21 (G1=L G1 ):110 Length of second ground element 22 (G2): 70 Distance between metal end 51 and first power supply element 11 (F): 5 Distance between power supply electrode H and ground electrode G: 12 Size of power supply electrode H (width (X) x height (Y)): 10 x 18 Size of ground electrode G (width (X) x height (Y)): 13 x 18

[0054] Example 3 In Example 3, an antenna 35 was formed as a vehicle window glass 105. The dimensions of the antenna 35 are as follows, and the unit is "mm".

[0055] The length of the first power supply element 11 (H1=L H1 ):65 The length of the second power supply element 12 (H2=L H2 ):8 The length of the first ground element 21 (G1=L G1 ):110 Length of second ground element 22 (G2): 70 Length of the third ground element 23 (G3): 65 Length of the fourth ground element 24 (G4): 3 Distance between metal end 51 and first power supply element 11 (F): 5 Distance between power supply electrode H and ground electrode G: 12 Size of power supply electrode H (width (X) x height (Y)): 10 x 18 Size of ground electrode G (width (X) x height (Y)): 13 x 18

[0056] Example 4 In Example 3, the antenna 35 was formed as a vehicle window glass 108. The dimensions of the antenna 38 are as follows, and the unit is "mm".

[0057] The length of the first power supply element 11 (H1=L H1 ):65 The length of the second power supply element 12 (H2=L H2 ):8 Length of the fourth power supply element 14 (H4): 160 Length of fifth power supply element 15 (H5): 100 The length of the first ground element 21 (G1=L G1 ):110 Distance between metal end 51 and first power supply element 11 (F): 5 Distance between power supply electrode H and ground electrode G: 12 Size of power supply electrode H (width (X) x height (Y)): 10 x 18 Size of ground electrode G (width (X) x height (Y)): 13 x 18

[0058] 11, good antenna gain was obtained in the predetermined frequency band (470 MHz to 710 MHz) for all of the antennas mounted on the vehicle window glass. For example, the antenna 31 of Example 1 had a high gain in the low frequency range of terrestrial digital television broadcast waves, and the antennas of Examples 2 to 4 had relatively higher gains in the high frequency range of terrestrial digital television broadcast waves than Example 1.

[0059] In this way, the antenna formed on the vehicle window glass of each example can be arranged close to the metal part 50 by bringing the first feeding element 11 close to the metal part 50, which improves the design especially when a light-shielding film is provided on the periphery of the glass plate. Furthermore, the antenna formed on the vehicle window glass of each example was able to achieve good antenna characteristics in a predetermined frequency band (the frequency band of terrestrial digital television broadcast waves).

[0060] The configurations shown in the above embodiments are merely examples of the content of the present invention, and can be combined with other known technologies. Parts of the configuration can be omitted or modified without departing from the scope of the present invention. The open end of each element is located at the leading edge in the extension direction, but the area near the leading edge may have a portion bent in a direction different from the extension direction. Furthermore, the area near the leading edge opposite the open end of each element may also have a portion bent in a direction different from the extension direction. Thus, the shape of the elements constituting each antenna may be partially different from the antenna shape shown in each embodiment, as long as the receiving sensitivity is not exceeded. [Explanation of symbols]

[0061] 1 1st area 2 Second area 10 Power supply element 11 First feeding element 12 Second feeding element 13 Third feeding element 14 Fourth feeding element 15 5th feeding element 20 Grounding Element 21 First grounding element 22 Second grounding element 23 Third ground element 24 Fourth Grounding Element 31, 32, 33, 34, 35, 36, 37, 38 Antennas 40 Glass Plate 50 Metal Part 51 Metal edge 101, 102, 103, 104, 105, 106, 107, 108 Vehicle window glass B Virtual boundary line H Power supply electrode G ground electrode

Claims

1. A glass plate and an antenna formed on the glass plate, the antenna having a feeding electrode, a feeding element connected to the feeding electrode, and a ground electrode, and a ground element connected to the ground electrode; When an imaginary boundary line is defined as being perpendicular to an edge of a metal portion of the vehicle that is closest to the antenna and corresponds to a boundary between the glass plate and the metal portion of the vehicle that is closest to the antenna, and the boundary line passes through the center of the gap between the feed electrode and the ground electrode, a region of the glass plate that is closer to the feed electrode than the imaginary boundary line is defined as a first region, and a region of the glass plate that is closer to the ground electrode than the imaginary boundary line is defined as a second region, the power supply element includes a first power supply element that extends into the second region and has an open end, is positioned closer to the metal portion than the ground electrode and the ground element, and is capacitively coupled to the metal portion; The grounding element includes a first grounding element that is electrically connected to the grounding electrode and extends to an opposite side to the first region side to form an open end.

2. The vehicle window glass according to claim 1 , wherein the first power supply element is disposed between the metal portion and the ground electrode.

3. When the center wavelength in air of the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, the length L of the first feeding element is Ｈ１ teeth, 0.07×λ×k≦L Ｈ１ ≦0.98×λ×k 3. The vehicle window glass according to claim 1, wherein the following is satisfied:

4. The vehicle window glass according to claim 1 , wherein the power supply element has an L-shape and includes a second power supply element that connects the power supply electrode and the first power supply element.

5. When the center wavelength in air of the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, the total length L of the first feeding element and the second feeding element is Ｈ１ +L Ｈ２ teeth, 0.07×λ×k≦L Ｈ１ +L Ｈ２ ≦1.02×λ×k 5. The vehicle window glass according to claim 4, which satisfies the following:

6. The vehicle window glass according to claim 4 or 5, wherein the power supply element includes a third power supply element connected to the second power supply element and extending to an opposite side to the second region side to form an open end.

7. A glass plate; an antenna formed on the glass plate, the antenna having a feeding electrode, a feeding element connected to the feeding electrode, and a ground electrode, and a ground element connected to the ground electrode; When an imaginary boundary line is defined as being perpendicular to an edge of a metal portion of the vehicle that is closest to the antenna and corresponds to a boundary between the glass plate and the metal portion of the vehicle that is closest to the antenna, and the boundary line passes through the center of the gap between the feed electrode and the ground electrode, a region of the glass plate that is closer to the feed electrode than the imaginary boundary line is defined as a first region, and a region of the glass plate that is closer to the ground electrode than the imaginary boundary line is defined as a second region, The power supply element is a first feeding element that extends into the second region and has an open end, is positioned closer to the metal portion than the ground electrode and the ground element, and is capacitively coupled to the metal portion; a second power supply element connecting the power supply electrode and the first power supply element; a third power supply element connected to the second power supply element and extending to an opposite side to the second region side to form an open end.

8. 7. The vehicle window glass according to claim 1, wherein the power supply element includes a fourth power supply element that is electrically connected to the power supply electrode and extends to an opposite side to the second region to form an open end.

9. A glass plate; an antenna formed on the glass plate, the antenna having a feeding electrode, a feeding element connected to the feeding electrode, and a ground electrode, and a ground element connected to the ground electrode; When an imaginary boundary line is defined as being perpendicular to an edge of a metal portion of the vehicle that is closest to the antenna and corresponds to a boundary between the glass plate and the metal portion of the vehicle that is closest to the antenna, and the boundary line passes through the center of the gap between the feed electrode and the ground electrode, a region of the glass plate that is closer to the feed electrode than the imaginary boundary line is defined as a first region, and a region of the glass plate that is closer to the ground electrode than the imaginary boundary line is defined as a second region, The power supply element is a first feeding element that extends into the second region and has an open end, is positioned closer to the metal portion than the ground electrode and the ground element, and is capacitively coupled to the metal portion; a fourth power supply element electrically connected to the power supply electrode and extending to an opposite side to the second region to form an open end.

10. the power supply element includes a fifth power supply element electrically connected to the power supply electrode and extending to an opposite side to the second region to form an open end, The vehicle window glass according to claim 8 , wherein the fourth power supply element is located closer to the metal part than the fifth power supply element.

11. The vehicle window glass according to claim 10, wherein the fourth power supply element is longer than the fifth power supply element.

12. When the center wavelength in air of the frequency band received by the antenna is λ and the wavelength shortening rate of the glass plate is k, the length LG1 of the first ground element is 0.07×λ×k≦L Ｇ１ ≦1.19×λ×k The vehicle window glass according to any one of claims 1 to 6, 8, 10 and 11, which satisfies the above.

13. The vehicle window glass according to any one of claims 1 to 6, 8, and 10 to 12, wherein the grounding element has a second grounding element that is electrically connected to the grounding electrode and extends to an opposite side to the first region side to form an open end.

14. 14. A vehicle glazing according to claim 13, wherein the first grounding element is longer than the second grounding element.

15. 15. The vehicle glazing according to claim 13 or 14, wherein the ground element comprises a third ground element electrically connected to the ground electrode and extending into the first region to form an open end.

16. 16. The vehicle glazing according to claim 15, wherein the ground element includes a fourth ground element connecting the ground electrode to the second ground element and the third ground element.

17. The vehicle window glass according to claim 1 , wherein an end side of the metal portion is substantially parallel to the horizontal direction when the glass plate is attached to a vehicle.

18. The vehicle window glass according to claim 1 , wherein the antenna is capable of receiving radio waves in a frequency band for terrestrial digital television broadcast waves.

19. 19. The vehicle window glass according to any one of claims 1 to 18, wherein the glass sheet comprises at least one of a windshield, a side glass, and a rear glass.

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