Vehicle window glass

Abstract

To provide a window glass for a vehicle, comprising a plurality of antennas, which can receive radio waves in a plurality of different frequency bands with high gain.SOLUTION: A window glass for a vehicle 101, comprises: a glass plate 10; a first antenna 30 that is provided to the glass plate 10; and a second antenna 40 that is provided to the glass plate 10, and receives a radio wave in a frequency band higher than that of the first antenna 30. The first antenna 30 includes: a first power supply part 31; a power supply element 32 connected to the first power supply part 31; and a parasitic element 39 that is arranged so as to be separated from the power supply element 32. The parasitic element 39 contains a bending element 34 that contains a part of an L-shape and an U-shape. The bending element 34 contains: a first element 35 that contains a part capacitively coupling to a part of the parasitic element 39; and a second element 36 that is arranged so as to be separated from the power supply element 32 compared to the first element 35.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to vehicle glazings. [Background technology]

[0002] In recent years, vehicle window glass provided with multiple antennas has been put into practical use so as to be able to receive radio waves in multiple frequency bands, such as AM broadcast waves, FM broadcast waves, terrestrial digital television broadcast waves, DAB (Digital Audio Broadcasting), etc. For example, a vehicle window glass is known in which multiple antennas are provided in a blank area above a defogger (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-204190 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with conventional technology, it has been difficult to receive radio waves in a plurality of different frequency bands with high gain.

[0005] The present disclosure provides a vehicle window glass equipped with a plurality of antennas capable of receiving radio waves in a plurality of different frequency bands with high gain. [Means for solving the problem]

[0006] In one aspect of the present disclosure, A glass plate and a first antenna provided on the glass plate; a second antenna provided on the glass plate for receiving radio waves in a higher frequency band than the first antenna; the first antenna has a first feeding section, a feeding element connected to the first feeding section, and a parasitic element arranged away from the feeding element; the parasitic element includes a bending element including an L-shaped or U-shaped portion, The vehicle window glass is provided, wherein the bending element includes a first element including a portion that is capacitively coupled with a portion of the power supply element, and a second element that is positioned farther away from the power supply element than the first element. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to provide a vehicle window glass including a plurality of antennas capable of receiving radio waves in a plurality of different frequency bands with high gain. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view showing one configuration example 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 diagram showing an example of the results of measurements of the frequency characteristics of antenna gain in the band of horizontally polarized FM broadcast waves. [Figure 6] FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of antenna gain in the band of vertically polarized FM broadcast waves. [Figure 7] FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of antenna gain in the DAB Band III band of vertically polarized waves. [Figure 8] FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of the antenna gain in the band of horizontally polarized FM broadcast waves when the length LC is changed. [Figure 9]FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of the antenna gain in the band of vertically polarized FM broadcast waves when the length LC is changed. [Figure 10] FIG. 10 is a diagram showing an example of the measurement results of the frequency characteristics of the antenna gain in the band of horizontally polarized FM broadcast waves when the path length LH between the open ends of a bending element including an L-shaped or U-shaped portion is changed. [Figure 11] FIG. 10 is a diagram showing an example of the measurement results of the frequency characteristics of the antenna gain in the band of vertically polarized FM broadcast waves when the path length LH between the open ends of a bending element including an L-shaped or U-shaped portion is changed. [Figure 12] FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of the antenna gain in the DAB Band III band of vertically polarized waves when the shortest distance D is changed. [Figure 13] FIG. 10 is a diagram showing an example of the results of measurements of the frequency characteristics of antenna gain in the band of horizontally polarized terrestrial digital television broadcast waves when the shortest distance D is changed. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment will be described below with reference to the drawings. 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, left-right, and so on are permissible to the extent that they do not impair the functions and effects of the embodiments. The shape of the corners is not limited to right angles, and may be rounded in an arched shape. Furthermore, "opposing" does not necessarily mean completely opposing, but may also mean partially opposing, and "overlapping" does not necessarily mean completely overlapping, but may also mean partially overlapping.

[0010] Examples of the vehicle window glass in this embodiment include a rear glass attached to the rear of the vehicle, a windshield attached to the front of the vehicle, a side glass attached to the side of the vehicle, a roof glass attached to the ceiling of the vehicle, etc. The vehicle window glass is not limited to these examples, and may be, for example, a window glass in which the roof glass is integrated with one or both of the windshield and the rear glass.

[0011] Fig. 1 is a plan view showing an example of the configuration of a vehicle window glass according to the first embodiment. The window glass 101 shown in Fig. 1 is an example of a vehicle window glass, and is attached to a window frame 210 formed on a vehicle body. The window glass 101 includes a glass plate 10. Fig. 1 shows the window glass 101 in a plan view from the normal direction of the surface of the glass plate 10.

[0012] In FIG. 1, a first direction A1, a second direction A2, a third direction A3, and a fourth direction A4 indicate directions in a plan view of the glass plate 10. The second direction A2 indicates a direction opposite to the first direction A1, and the fourth direction indicates a direction opposite to the third direction A3. In this embodiment, any two adjacent directions among the first direction A1, the second direction A2, the third direction A3, and the fourth direction A4 intersect at a right angle (which may include an approximately right angle). These descriptions are also applicable to other plan views.

[0013] The window frame 210 is a conductive part that can be grounded and is also called a flange. The window frame 210 has a frame side 211 that forms an opening that is covered by the window glass 101. The window frame 210 is an example of a metal part of a vehicle.

[0014] The glass plate 10 is an example of a glass plate for a vehicle and is a transparent or translucent plate-shaped dielectric. The glass plate 10 has an outer peripheral edge 12 that is attached to a window frame 210. The glass plate 10 is attached to the window frame 210 so that the outer peripheral edge 12 overlaps with the window frame 210 in a plan view from inside the vehicle.

[0015] The window glass 101 includes an antenna 30 and an antenna 40 on the glass plate 10 .

[0016] Antenna 30 is an example of a first antenna and is provided on glass plate 10. Antenna 30 is configured to be able to receive radio waves in a first frequency band F1. Antenna 40 is an example of a second antenna and is provided on glass plate 10. Antenna 40 is configured to be able to receive radio waves in a second frequency band F2 that is higher than the first frequency band F1.

[0017] The shape of the antenna 30 is suitable for transmitting and receiving radio waves in the VHF (Very High Frequency) band with a frequency of 30 MHz to 300 MHz. The antenna 40 is suitable for transmitting and receiving radio waves in the VHF band, the UHF (Ultra High Frequency) band with a frequency of 300 MHz to 3 GHz, or the SHF (Super High Frequency) band with a frequency of 3 GHz to 30 GHz. For example, the first frequency band F1 is set to the FM broadcast wave band (76 MHz to 108 MHz) included in the VHF band. The second frequency band F2 may be set to the DAB Band III band (170 MHz to 240 MHz) included in the VHF band or the terrestrial digital television broadcast wave band (470 MHz to 710 MHz) included in the UHF band. Furthermore, the second frequency band F2 may be set to transmit and receive radio waves for Wi-Fi, a wireless local area network (LAN), or to transmit and receive radio waves in the 600 MHz to 6 GHz frequency band (sub6) used in the fifth generation communication (5G) standard.

[0018] The antenna 30 includes a feeding section 31 , a feeding element 32 and a parasitic element 39 .

[0019] The power supply unit 31 is an example of a first power supply unit, and is, for example, an electrode for power supply. The power supply unit 31 is provided near the outer peripheral edge 12 of the glass plate 10 so as to be located near the frame side 211 when the window glass 101 is attached to the window frame 210. The power supply unit 31 is electrically connected to one end of a power supply line (for example, one end of a signal line of a coaxial cable) via a conductive member such as a connector. The other end of the power supply line is connected to, for example, a communication device such as a receiver. The shape of the power supply unit 31 is preferably a rectangular shape or a polygonal shape, such as a square, an approximately square, a rectangle, or an approximately rectangular shape, for implementation purposes, but is not limited to these, and other shapes such as a circle, an approximately circle, an ellipse, or an approximately ellipse may also be used.

[0020] The power feeding element 32 is an element connected to the power feeding portion 31. The power feeding element 32 is a linear conductor extending from the power feeding portion 31 to an open end 32b, which is the end opposite the power feeding portion 31. The power feeding element 32 includes a portion 32a extending in the first direction A1. In FIG. 1, the power feeding element 32 has the open end 32b at the tip in the first direction A1, but is not limited to this. The power feeding element 32 may have an element that extends from the tip in the first direction A1 and bends in a direction different from the first direction A1, for example, in a fourth direction A4.

[0021] The parasitic element 39 is an element that is disposed away from the feed element 32 and is not connected to the feed section 31 or the feed element 32. The parasitic element 39 is a linear conductor that includes a bent element 34 that includes an L-shaped portion. The bent element 34 includes a first element 35 that includes a portion that is capacitively coupled with a part of the feed element 32, and a second element 36 that is disposed farther away from the feed element 32 than the first element 35. In this example, the L-shaped portion included in the bent element 34 is formed by the first element 35 and the second element 36.

[0022] The antenna 30 has a parasitic element 39 including a bending element 34, and therefore has an improved antenna gain in the first frequency band F1 compared to an antenna without the parasitic element 39. The window glass 101 also has an antenna 40 that is suitable for receiving radio waves in a second frequency band F2 that is higher than the first frequency band F1. Therefore, the window glass 101 can be provided as a vehicle window glass equipped with multiple antennas that can receive radio waves in multiple different frequency bands with high gain.

[0023] Furthermore, the window glass of this embodiment can receive radio waves in both frequency bands with high gain even when the antennas 30, 40 that receive radio waves in two different frequency bands are close to each other, so it can be used for side glass, such as rear glass, which has a smaller area than other window glass.

[0024] The first element 35 may include a portion 35a that is capacitively coupled to the portion 32a of the power-supply element 32. The portion 35a is spaced from the portion 32a by a distance d that allows capacitive coupling. In the example of FIG. 1, the portion 35a that is capacitively coupled to the portion 32a is located on the third direction A3 side of the portion 32a, but may be located on the fourth direction A4 side of the portion 32a. Furthermore, if the power-supply element 32 has a portion that bends from the first direction A1 to the third direction A3 or the fourth direction A4, the first element 35 may have a portion 35a that is capacitively coupled to the portion 32a that extends in the third direction A3 or the fourth direction A4. In this case, the portion 35a may extend in a direction substantially parallel to the third direction A3 or the fourth direction A4 in which the portion 32a extends and run parallel to the portion 32a. The distance d at which capacitive coupling is possible may be, for example, greater than 0 mm and equal to or less than 30 mm, or may be 1 mm or more and equal to or less than 25 mm, or 2 mm or more and equal to or less than 20 mm, or 3 mm or more and equal to or less than 15 mm, or 3 mm or more and equal to or less than 10 mm.

[0025] The bending element 34 may have an open end 34b at the end opposite to the feed element 32 side. By configuring the bending element 34 to have the open end 34b (for example, a configuration that does not include a closed loop), the antenna gain in the first frequency band F1 is improved compared to a configuration that does not have the open end 34b (for example, a configuration in which the bending element 34 includes a closed loop annular portion). Note that, although the configuration of the bending element 34 in the example of FIG. 1 does not include a closed loop annular portion, it may also be a configuration that includes a closed loop annular portion (for example, a closed loop configuration in which the end 34b is further folded back and connected to the first element 35).

[0026] The bending element 34 may be an element that opens on the antenna 40 side. This allows the area occupied by the antennas 30 and 40 to be reduced compared to an embodiment in which the bending element 34 does not open on the antenna 40 side. In the example of FIG. 1, the antenna 40 is Bending element 34 Since the bending element 34 is located on the opposite side to the side where the bending element 34 is present, it can be said that the bending element 34 opens on the antenna 40 side.

[0027] Antenna 40 may overlap the area where bending element 34 is projected in the direction where bending element 34 opens. This allows the area occupied by antennas 30 and 40 to be reduced compared to a configuration where antenna 40 does not overlap the area where bending element 34 is projected in the direction where bending element 34 opens. In the example of Fig. 1, antenna 40 is oriented in the direction opposite to the side where antenna 40 is located with respect to an imaginary line passing through two open ends 34a, 34b of bending element 34.

[0028] In this example, the antenna 40 is located on the third direction A3 side relative to the power supply element 32, but may be located on the fourth direction A4 side relative to the power supply element 32.

[0029] The length of the first element 35 running parallel to the power supply element 32 and capacitively coupled with it is L C When L Cis 20mm or more (L C ≧20 mm), the antenna gain of the antenna 30 in the first frequency band F1 is improved. C is preferably 25 mm or more, and more preferably 30 mm or more. C The upper limit of L is not particularly limited as long as radio waves in the first frequency band F1 can be received with a desired gain. C The upper limit may be, for example, 400 mm or 300 mm.

[0030] The first element 35 runs parallel to the end of the feed element 32 and is capacitively coupled to it, thereby improving the antenna gain of the antenna 30 in the first frequency band F1. In the example of FIG. 1 , the first element 35 includes a portion 35a running parallel to a portion 32a, which is the end of the feed element 32 and includes the open end 32b, and the portion 35a is capacitively coupled to the portion 32a. The first element 35 may run parallel to an intermediate portion of the feed element 32 that does not include the open end 32b, rather than running parallel to the end of the feed element 32 that includes the open end 32b. Furthermore, the feed element 32 may run parallel to an intermediate portion of the first element 35 that does not include the open end 34a, rather than running parallel to the end of the first element 35 that includes the open end 34a, and be capacitively coupled to it. Even in this case, the antenna gain of the antenna 30 in the first frequency band F1 is ensured.

[0031] The path length from the open end 34a of the bending element 34 on the side of the power supply element 32 to the open end 34b of the bending element 34 on the opposite side of the power supply element 32 is L H The wavelength in the air of the radio wave of the first frequency band F1 received by the antenna 30 is λ, and the wavelength shortening rate of the glass plate 10 is k. In this case, the path length L H teeth, 1 / 8×λ×k ≦ L H ≦ 3 / 8×λ×k...Equation 1a When the above condition is satisfied, the antenna gain of the antenna 30 in the first frequency band F1 is improved. 7 / 50×λ×k ≦ L H≦ 9 / 25×λ×k...Equation 1b is preferred, 3 / 20×λ×k ≦ L H ≦ 7 / 20×λ×k...Equation 1c is more preferred.

[0032] When the shortest distance D between the second element 36 and the antenna 40 is 20 mm or more, the minimum value of the antenna gain in the second frequency band F2 of the antenna 40 is improved. In order to improve the minimum value of the antenna gain in the second frequency band F2 of the antenna 40, the shortest distance D is preferably 50 mm or more, more preferably 100 mm or more, and even more preferably 150 mm or more. There is no particular upper limit to the shortest distance D as long as the second element 36 and the antenna 40 do not protrude from the glass plate 10.

[0033] When a portion of the power feeding element 32 and at least a portion of the first element 35 are formed to extend in a substantially horizontal direction when the glass sheet 10 is attached to a vehicle, the antenna gain of the horizontally polarized wave of the antenna 30 is improved. In the example of FIG. 1, both the power feeding element 32 and the first element 35 include portions extending in the first direction A1. More specifically, in the example of FIG. 1, the power feeding element 32 includes a portion 32a extending in the first direction A1, and the first element 35 includes a portion 35a extending in the first direction A1. When the glass sheet 10 is attached to the window frame 210 of the vehicle, when the first direction A1 is substantially parallel to the horizontal plane, the antenna gain of the horizontally polarized wave of the antenna 30 is improved.

[0034] The second element 36 may include a portion that extends in a direction substantially perpendicular to the direction in which the portion included in the first element 35 extends. In the example of FIG. 1, the second element 36 includes a portion that extends in the third direction A3. More specifically, in the example of FIG. 1, the second element 36 includes a portion that extends in the third direction A3. When the glass sheet 10 is attached to the window frame 210 of the vehicle, if the third direction A3 is substantially perpendicular to the horizontal plane, the antenna gain of the vertically polarized wave of the antenna 30 is improved.

[0035] In the example of FIG. 1, antenna 40 includes a feed section 41 and an element 42 connected to feed section 41 .

[0036] The power supply unit 41 is an example of a second power supply unit, and is, for example, an electrode for power supply. The shape and arrangement position of the power supply unit 41 are similar to those of the power supply unit 31.

[0037] Antenna 40 may further include power supply unit 43. Power supply unit 43 is an example of a third power supply unit, and is, for example, a ground electrode. The shape and location of power supply unit 43 are similar to those of power supply unit 31. In other words, antenna 40 may be a monopole type or a bipole type.

[0038] The element 44 is an element connected to the power supply portion 43. The element 44 is a linear conductor extending from the power supply portion 43 to an open end 44a, which is the end opposite to the power supply portion 43.

[0039] 1, antenna 40 includes a power feed portion 41 and an element 42 connected to power feed portion 41. Element 42 is a linear conductor extending from power feed portion 41 to an open end 42a, which is the end opposite power feed portion 41. In this example, element 42 is located between power feed element 32 and element 44.

[0040] When glass plate 10 is attached to a vehicle, power supply unit 31 and power supply unit 41 are preferably aligned along a metal part of the vehicle (in this example, one edge 211a of frame side 211 of window frame 210). This brings power supply unit 31 and power supply unit 41 close to each other, allowing the power supply structure to power supply unit 31 and power supply unit 41 to be made compact. Furthermore, it is more preferable that power supply unit 43, together with power supply unit 31 and power supply unit 41, be aligned along a metal part of the vehicle.

[0041] Fig. 2 is a plan view showing an example of the configuration of a vehicle window glass of the second embodiment. In the second embodiment, the description of the configuration, action, and effect similar to those of the above-mentioned embodiments will be omitted or simplified by incorporating the above description. The window glass 102 of the second embodiment shown in Fig. 2 differs from the window glass 101 of the first embodiment in that the bending element 34 includes a U-shaped portion.

[0042] 2, the bending element 34 further includes a third element 37, and the U-shaped portion included in the bending element 34 is formed by the first element 35, the second element 36, and the third element 37. The third element 37 includes a portion that extends in a direction different from the extension directions of the first element 35 and the second element 36. In this example, the third element 37 is a linear conductor that is connected to an end of the second element 36 extending in the third direction A3, and extends from that end in the second direction A2 to the open end 34b.

[0043] The antenna 30 has a parasitic element 39 including the third element 37, and therefore has an improved antenna gain in the first frequency band F1 compared to an antenna without the parasitic element 39. Therefore, the window glass 102 can be provided as a vehicle window glass equipped with multiple antennas that can receive radio waves in multiple different frequency bands with high gain.

[0044] Fig. 3 is a plan view showing one configuration example of a vehicle window glass of the third embodiment. In the third embodiment, explanations of the same configurations, actions, and effects as those of the above-mentioned embodiments will be omitted or simplified by incorporating the above explanations. A window glass 103 of the third embodiment shown in Fig. 3 differs from the window glass 102 of the second embodiment in that the first element 35 includes a crank-shaped portion 38. Note that in the window glass 101 of Fig. 1, the first element 35 may include a crank-shaped portion.

[0045] 3, crank-shaped portion 38 is connected to second element 36. Crank-shaped portion 38 is formed by first portion 38a and second portion 38b. First portion 38a extends in a direction different from the extension direction of portion 35a (in this example, third direction A3). Second portion 38b extends in a direction different from the extension direction of first portion 38a (in this example, first direction A1).

[0046] The antenna 30 has a parasitic element 39 including a crank-shaped portion 38, and therefore has an improved antenna gain in the first frequency band F1 compared to an antenna without the parasitic element 39. Therefore, the window glass 103 can be provided as a vehicle window glass equipped with multiple antennas that can receive radio waves in multiple different frequency bands with high gain.

[0047] FIG. 4 is a plan view showing an example of the configuration of a vehicle window glass according to the fourth embodiment. In the fourth embodiment, the description of the configuration, actions, and effects similar to those of the above-described embodiments will be omitted or simplified by incorporating the above descriptions. The window glass 104 of the fourth embodiment shown in FIG. 4 differs from the window glass 102 of the second embodiment in that the bending element 34 includes auxiliary elements 51 and 52. The bending element 34 may include one or both of the auxiliary elements 51 and 52. Note that in the window glasses 101, 102, and 103 of FIGS. 1, 2, and 3, the bending element 34 may include one or both of the auxiliary elements 51 and 52.

[0048] In FIG. 4, the auxiliary element 51 is connected to the first element 35 or the second element 36. The auxiliary element 51 is, for example, a linear conductor extending in the first direction A1 from the connection between the first element 35 and the second element 36 to the open end 34c. On the other hand, the auxiliary element 52 is connected to the third element 37 or the second element 36. The auxiliary element 52 is a linear conductor extending in the first direction A1 from the connection between the third element 37 and the second element 36 to the open end 34d. The auxiliary element 51 is an example of a first auxiliary element. The auxiliary element 52 is an example of a second auxiliary element.

[0049] In the antenna 30, the bending element 34 includes one or both of the auxiliary elements 51 and 52, which makes it easier to tune the antenna gain for the first frequency band F1 compared to a configuration in which the bending element 34 does not include either of the auxiliary elements 51 and 52. Therefore, the window glass 104 can be provided as a vehicle window glass equipped with multiple antennas that can receive radio waves in multiple different frequency bands with high gain.

[0050] FIG. 5 is a diagram showing an example of measurement results of the frequency characteristics of antenna gain in the band of horizontally polarized FM broadcast waves. FIG. 6 is a diagram showing an example of measurement results of the frequency characteristics of antenna gain in the band of vertically polarized FM broadcast waves. FIG. 7 is a diagram showing an example of measurement results of the frequency characteristics of antenna gain in the band of vertically polarized DAB Band III. FIGS. 5 to 7 show examples of window glass 102 (FIG. 2) and window glass 103 (FIG. 3), and show window glass 102 (FIG. 2) without parasitic element 39 as a comparative example. In FIGS. 5 to 7, antenna 30 is an antenna configured to be able to receive radio waves in the frequency band of FM broadcast waves. Antenna 40 is an antenna configured to be able to receive radio waves in the frequency band of DAB Band III.

[0051] 5 and 6, compared to window glass without the parasitic element 39, the window glasses 102 and 103 having the parasitic element 39 had improved antenna gain in the frequency band of FM broadcast waves of the antenna 30. Furthermore, as shown in FIGS. 5 to 7, the window glasses 102 and 103 having the parasitic element 39 suppressed a decrease in antenna gain in the frequency band of DAB Band III of the antenna 40, even when the antennas 30 and 40 that receive radio waves in two different frequency bands were located close to each other.

[0052] In the actual measurements shown in Figures 5 to 7, the conditions for the dimensions of each part of the window glass 102 (Figure 2) and the window glass 103 (Figure 3) are as follows: Path length from power supply 31 to open end 32b (FIGS. 2 and 3): 350 mm Path length L from open end 34a to open end 34bH (Figure 2): 760mm Path length L from open end 34a to open end 34b H (Figure 3): 760mm Path length from power supply 41 to open end 42a (FIGS. 2 and 3): 200 mm Path length from the power supply 43 to the open end 44a (FIGS. 2 and 3): 780 mm Length L C (Figures 2 and 3): 170mm Distance d (Figures 2 and 3): 10 mm Shortest distance D (Figures 2 and 3): 170 mm Wavelength reduction rate k of glass plate: 0.64 It was decided.

[0053] Figure 8 shows the length L C 9 is a graph showing an example of the results of measurements of the frequency characteristics of the antenna gain in the band of horizontally polarized FM broadcast waves when the length L C 8 and 9 show an example of the results of measurements of the frequency characteristics of antenna gain in the band of vertically polarized FM broadcast waves when the parasitic element 39 is changed. Figs. 8 and 9 show an embodiment of window glass 103 (Fig. 3), and show, as a comparative example, window glass in which the parasitic element 39 is removed from window glass 103 (Fig. 3). In Figs. 8 and 9, antenna 30 is an antenna configured to be able to receive radio waves in the frequency band of FM broadcast waves. Antenna 40 is an antenna configured to be able to receive radio waves in the frequency band of DAB Band III.

[0054] As shown in Figures 8 and 9, the length L C The longer the length, the stronger the capacitive coupling becomes, so the window glass 103 having the parasitic element 39 has improved antenna gain in the frequency band of FM broadcast waves of the antenna 30.

[0055] In addition, when the measurements were taken in FIGS. 8 and 9, the conditions such as the dimensions of each part of the window glass 103 (FIG. 3) were as follows: Path length from power supply 31 to open end 32b (Fig. 3): 350 mm Path length L from open end 34a to open end 34b H (Figure 3): 677mm Path length from power supply 41 to open end 42a (FIG. 3): 200 mm Path length from power supply 43 to open end 44a (FIG. 3): 780 mm Length L C (Figure 3): Change Distance d (Figure 3): 3mm Shortest distance D (Fig. 3): 200 mm Wavelength reduction rate k of glass plate: 0.64 It was decided.

[0056] FIG. 10 shows the path length L between the open end 34a and the open end 34b. H 11 is a graph showing an example of the results of measurements of the frequency characteristics of the antenna gain in the band of horizontally polarized FM broadcast waves when the path length L between the open ends 34a and 34b is changed. H 10 shows an example of the results of measurements of the frequency characteristics of the antenna gain in the band of vertically polarized FM broadcast waves when the path length L is changed. FIG. 10 shows an embodiment of the window glass 103 (FIG. 3). In FIG. 10, the antenna 30 is an antenna configured to be able to receive radio waves in the frequency band of FM broadcast waves. The antenna 40 is an antenna configured to be able to receive radio waves in the frequency band of DAB Band III. Note that the path length L H In the cases of 490 mm and 590 mm, the third element 37 is removed from the window glass 103 (FIG. 3).

[0057] As shown in Figs. 10 and 11, the path length L H Compared with the case where the path length L is 1040 mm, H When the path length L is 490 mm to 940 mm, the antenna gain of the antenna 30 in the frequency band of the FM broadcast wave is improved. H When the wavelength is 490 mm to 940 mm, the first frequency band F1 is the frequency band of FM broadcast waves (76 MHz to 108 MHz) and the wavelength shortening rate k is 0.64, the above formula 1a is satisfied.

[0058] In addition, when the measurements were taken in FIGS. 10 and 11, the conditions such as the dimensions of each part of the window glass 103 (FIG. 3) were as follows: Path length from power supply 31 to open end 32b (Fig. 3): 350 mm Path length L from open end 34a to open end 34b H (Figure 3): Change Path length from power supply 41 to open end 42a (FIG. 3): 200 mm Path length from power supply 43 to open end 44a (FIG. 3): 780 mm Length L C (Figure 3): 170mm Distance d (Figure 3): 10 mm Wavelength reduction rate k of glass plate: 0.64 It was decided.

[0059] Fig. 12 is a diagram showing an example of the results of actual measurements of the frequency characteristics of antenna gain in the DAB Band III band of vertically polarized waves when the shortest distance D is changed. Fig. 12 shows an example of window glass 104 (Fig. 4). In Fig. 12, antenna 30 is an antenna configured to be able to receive radio waves in the frequency band of FM broadcast waves. Antenna 40 is an antenna configured to be able to receive radio waves in the DAB Band III frequency band.

[0060] As shown in Figure 12, when the shortest distance D is 20 mm to 300 mm, the minimum value of the antenna gain in the DAB Band III band of the vertical polarization of antenna 40 is improved compared to when the shortest distance D is 10 mm, regardless of whether auxiliary elements 51 and 52 are present or not.

[0061] In addition, when the actual measurements were taken in FIG. 12, the conditions such as the dimensions of each part of the window glass 104 (FIG. 4) were as follows: Path length from power supply 31 to open end 32b (Fig. 4): 350 mm Path length L from open end 34a to open end 34b H (Figure 4): Change Path length from power supply 41 to open end 42a (FIG. 4): 250 mm Path length from power supply 43 to open end 44a (FIG. 4): 780 mm Length L C (Figure 4): 170mm Distance d (Figure 4): 10 mm Shortest distance D (Figure 4): Change Wavelength reduction rate k of glass plate: 0.64 It was decided.

[0062] Fig. 13 is a diagram showing an example of the results of actual measurements of the frequency characteristics of antenna gain in the band of horizontally polarized terrestrial digital television broadcast waves when the shortest distance D is changed. Fig. 13 shows an embodiment of window glass 104 (Fig. 4). In Fig. 13, antenna 30 is an antenna configured to be able to receive radio waves in the frequency band of FM broadcast waves. Antenna 40 is an antenna configured to be able to receive radio waves in the frequency band of terrestrial digital television broadcast waves.

[0063] As shown in Figure 13, when the shortest distance D is 150 mm, the minimum value of the antenna gain in the band of horizontally polarized terrestrial digital television broadcast waves of antenna 40 is improved compared to when the shortest distance D is 10 mm, regardless of whether auxiliary elements 51 and 52 are present or not.

[0064] In the actual measurements of FIG. 13, the conditions such as the dimensions of each part of the window glass 104 (FIG. 4) were the same as those in the actual measurements of FIG.

[0065] Although the embodiments have been described above, the technology of the present disclosure is not limited to the above-described embodiments, and various modifications and improvements are possible, such as combinations with or substitutions for part or all of other embodiments.

[0066] For example, the "end" of an element may be the start or end point of the extension of the element, or the vicinity of the start or end point, which is a conductor portion just before the start or end point. Furthermore, the "end" of an element may be bent or folded back within the scope of the effects of the present invention. Furthermore, the connection between elements may be connected with a curvature.

[0067] The antenna element and electrode are formed, for example, by printing and baking a paste containing a conductive metal (e.g., silver paste) on the interior surface of the window glass. However, the method for forming the antenna element and electrode is not limited to this method. For example, the antenna element or electrode may be formed by providing a linear or foil-shaped body containing a conductive material such as copper on the interior or exterior surface of the window glass. Alternatively, the antenna element or electrode may be attached to the window glass with an adhesive or the like, or may be provided inside the window glass itself.

[0068] Alternatively, a conductor layer forming at least one of an antenna element and an electrode may be provided inside or on the surface of a synthetic resin film, and the synthetic resin film with the conductor layer may be installed on the interior or exterior surface of the window glass.Furthermore, a flexible circuit board on which at least one of an antenna element and an electrode is formed may be installed on the interior or exterior surface of the window glass.

[0069] The glass plate 10 may also have a light-shielding film along its outer peripheral edge 12, and the electrodes and antenna element may overlap partly or entirely with the light-shielding film in a plan view of the glass plate 10. Specific examples of light-shielding films include ceramics such as black ceramic films. In this case, when the window glass is viewed from outside the vehicle, the overlapping portions with the light-shielding film in a plan view are difficult to see from outside the vehicle, improving the design of the window glass. [Explanation of symbols]

[0070] 10 Glass Plate 12 outer edge 21 Power supply unit 24b open end 30 Antenna 31 Power supply unit 32 Power supply element 32b open end 34 Elements 34a open end 34b open end 35 First Element 36 Second Element 37 Third Element 38 Crank-shaped part 38a Part 1 38b 2nd part 39 Parasitic element 40 Antenna 41,43 Power supply unit 42,44 Elements 51 Auxiliary element 52 Auxiliary element 101, 102, 103, 104 Window glass 210 Window Frame 211 Frame side 211a Edge

Claims

1. A glass plate and a first antenna provided on the glass plate; a second antenna provided on the glass plate and configured to receive radio waves in a frequency band higher than that of the first antenna, the first antenna has a first feeding section, a feeding element connected to the first feeding section, and a parasitic element arranged away from the feeding element, the parasitic element includes a bent element including an L-shaped or U-shaped portion; The bending element includes a first element including a portion that is capacitively coupled with a portion of the power supply element, and a second element that is positioned farther away from the power supply element than the first element.

2. The vehicle window glass according to claim 1 , wherein the bending element has an open end at an end opposite to the power supply element side.

3. 3. The vehicle window glass according to claim 1, wherein the parasitic element does not include a closed loop.

4. A vehicle window glass as described in any one of claims 1 to 3, wherein the second antenna is located on the opposite side of the bending element from the side on which the bending element is located with respect to an imaginary line passing through the two open ends of the bending element.

5. The length of the first element running parallel to the power supply element and capacitively coupled with it is L Ｃ When L Ｃ ≧20mm The vehicle window glass according to claim 1 , which satisfies the following:

6. The vehicle window glass according to claim 1 , wherein a portion of the first element runs parallel to and capacitively couples with a portion of the power supply element that includes an open end.

7. The path length from the open end of the bending element on the side of the power supply element to the open end of the bending element on the opposite side of the power supply element is L Ｈ When the wavelength in the air of the radio wave in the frequency band received by the first antenna is λ and the wavelength shortening rate of the glass plate is k, 1 / 8×λ×k≦L Ｈ ≦3 / 8×λ×k The vehicle window glass according to claim 1 , which satisfies the following:

8. The vehicle window glass according to claim 1 , wherein the first element includes a crank-shaped portion connected to the second element.

9. 9. The vehicle window glass according to claim 1, wherein a shortest distance between the second element and the second antenna is 20 mm or more.

10. The vehicle window glass according to claim 1 , wherein a portion of the power supply element and at least a portion of the first element extend in a substantially horizontal direction when the glass sheet is attached to a vehicle.

11. The vehicle window glass according to claim 10, wherein the second element includes a portion that extends in a direction substantially perpendicular to a direction in which the portion included in the first element extends.

12. the second antenna includes a second feed portion and an element connected to the second feed portion; 12. The vehicle window glass according to claim 1, wherein the first power supply portion and the second power supply portion are arranged side by side along a metal portion of the vehicle when the glass plate is attached to the vehicle.

13. The vehicle window glass according to claim 1 , wherein the glass plate is used as a side glass of a vehicle.

14. The vehicle window glass according to claim 1 , wherein the first antenna receives radio waves in an FM broadcast frequency band.

15. 15. The vehicle window glass according to claim 14, wherein the second antenna receives radio waves in the frequency band of DAB Band III.

16. The vehicle window glass according to claim 14, wherein the second antenna receives radio waves in a frequency band for terrestrial digital television broadcasting.

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