Vehicle window glass

Abstract

To provide a window glass for vehicle which comprises an antenna for receiving radio waves in a predetermined frequency band and improves visibility.SOLUTION: An antenna for receiving radio waves in a predetermined frequency band comprises: a power supply section; an antenna element electrically connected to the power supply section; and a parasitic element provided in a glass pane. The parasitic element includes: a first element extending on one straight line in a first direction from a first end to a second end in a central part of the glass pane; and a second element connected with the vicinity of the first end and including a portion extending in a second direction or a third direction. In the first element, no other conductor is connected in an intermediate segment in 85% of a length from the first end to the second end. The antenna element includes a portion which is positioned at an opposite side of a side of the second end with respect to the second element and capacitively coupled with the second element.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, there has been known an automobile glass antenna that includes an antenna conductor for FM broadcasting band and an independent conductor that is capacitively coupled to the antenna conductor. In this glass antenna, a first antenna element included in the independent conductor is connected to each of a plurality of second antenna elements near the center of the window glass in the left-right direction so as to extend longitudinally across the second antenna elements (see, for example, Patent Document 1). According to Patent Document 1, the first antenna element has the function of improving the antenna gain of vertically polarized waves in the high frequency band, and the second antenna element has the function of improving the antenna gain of horizontally polarized waves in the high frequency band. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2008 / 153079 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional glass antennas, the first antenna element crosses multiple second antenna elements in the vicinity of the center of the window glass, which can reduce visibility through the window glass.

[0005] The present disclosure provides a vehicle window glass that includes an antenna for receiving radio waves in a predetermined frequency band and that improves visibility. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, A glass plate and an antenna for receiving radio waves in a predetermined frequency band, the antenna includes a power feeder, an antenna element electrically connected to the power feeder, and a parasitic element provided on the glass plate; The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass plate; a second element connected to the vicinity of the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of its length from the first end to the second end, to which no other conductor is connected; The vehicle window glass is provided, wherein the antenna element is located on the opposite side of the second end with respect to the second element and includes a portion that is capacitively coupled with the second element. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to provide a vehicle window glass that includes an antenna for receiving radio waves in a predetermined frequency band and that improves visibility. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an example of a window glass according to a first embodiment. [Figure 2] FIG. 6 is a diagram showing an example of a window glass according to a second embodiment. [Figure 3] FIG. 10 is a diagram showing an example of a window glass according to a third embodiment. [Figure 4] FIG. 10 is a diagram showing an example of a window glass according to a fourth embodiment. [Figure 5] FIG. 10 is a diagram showing an example of a window glass according to a fifth embodiment. [Figure 6] FIG. 10 is a diagram showing an example of a window glass according to a sixth embodiment. [Figure 7] FIG. 13 is a diagram showing an example of a window glass according to a seventh embodiment. [Figure 8]FIG. 13 is a diagram showing an example of a window glass according to an eighth embodiment. [Figure 9] FIG. 13 is a diagram showing an example of a window glass according to a ninth embodiment. [Figure 10] FIG. 22 is a diagram showing an example of a window glass according to a tenth embodiment. [Figure 11] FIG. 20 is a diagram showing an example of a window glass according to an eleventh embodiment. [Figure 12] 10A and 10B are diagrams illustrating an example of the configuration of an antenna provided on a glass plate. [Figure 13] FIG. 10 is a diagram showing an example of a simulation result of antenna gain for vertically polarized waves in the FM broadcast wave band when a power feed unit is placed close to the side edge of a glass plate. [Figure 14] FIG. 10 is a diagram showing an example of a simulation result of antenna gain for vertically polarized waves in the FM broadcast wave band when a power feed unit is placed close to the bottom side of a glass plate. [Figure 15] FIG. 10 is a diagram showing an example of a simulation result of antenna gain for vertically polarized waves in the DAB Band III band when a power feed unit is arranged close to the side edge of a glass plate. [Figure 16] FIG. 10 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band in response to changes in LC / LH in the configuration of FIG. 1, when the maximum average value is set to 0 dB. [Figure 17] FIG. 2 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band in response to a change in the lateral position of the first element in the configuration of FIG. 1, when the maximum average value is set to 0 dB. [Figure 18] FIG. 10 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band with respect to the change in the lateral position of the first element in the configuration of FIG. 9, when the maximum average value is set to 0 dB. [Figure 19] FIG. 10 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band with respect to the change in d / (k×λ) in the configuration of FIG. 9, when the maximum value of the average value is set to 0 dB. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described 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 angle, orthogonal, horizontal, vertical, up and down, left and right, and terms such as identical and equal, are allowed to be deviated to the extent that the operation and effect of the embodiments are not impaired.

[0010] Examples of vehicle window glass to which the present embodiment is applicable include rear glass attached to the rear of a vehicle, windshield attached to the front of a vehicle, side glass attached to the side of a vehicle, roof glass attached to the ceiling of a vehicle, etc. 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 rear glass.

[0011] In the following description, the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4 represent the directions when the main surface of the window glass is viewed from inside the vehicle. The fourth direction D4 is the opposite direction to the first direction D1, and the third direction D3 is the opposite direction to the second direction D2. As long as the operation and effect of the embodiment are not impaired, the angle formed between the first direction D1 and the second direction D2 may be an angle of 45° to 135°, an angle of 60° to 120°, an angle of 75° to 105°, or an angle of 90°. As long as the functions and effects of the embodiment are not impaired, the angle between the second direction D2 and the third direction D3 or the angle between the first direction D1 and the fourth direction D4 may be an angle of 135° or more and 180° or less, an angle of 150° or more and 180° or less, an angle of 165° or more and 180° or less, or an angle of 180°. Of the first direction D1, the second direction D2, the third direction D3, and the fourth direction D4, two adjacent directions may be approximately perpendicular to each other.

[0012] FIG. 1 is a diagram showing an example of the configuration of a vehicle window glass according to the first embodiment. FIG. 1 shows a window glass 201 attached to a metal body 41 of a vehicle as seen from inside the vehicle. The window glass 201 is an example of a vehicle window glass. FIG. 1 shows an example of a window glass 201 used as a side glass of a vehicle. The window glass 201 includes a glass plate 43 for the side glass and an antenna 70 that receives radio waves in a predetermined frequency band W.

[0013] The glass plate 43 is attached to a metal body 41, which is an example of a metal part of a vehicle. The metal body 41 is, for example, a window frame (flange) to which the glass plate 43 is attached with an adhesive or the like. The glass plate 43 is attached to the metal body 41 so as to cover an opening 42 formed in the metal body 41. The metal body 41 has four edges 42a, 42b, 42c, and 42d that form the opening 42.

[0014] The antenna 70 includes a feeding section 72 , an antenna element 71 , and a parasitic element 60 .

[0015] The power supply portion 72 is a power supply terminal for supplying power to the antenna element 71. The power supply portion 72 is, for example, an electrode formed on the main surface of the glass plate 43. The shape of the power supply portion 72 is not limited to a rectangle and may be other shapes such as a circle. The power supply portion 72 is electrically connected to a conductive member 20 (FIG. 12) that supplies power to the antenna element 71. FIG. 12 will be described later.

[0016] 1, one end of the conductive member 20 is electrically connected to the power supply unit 72, and the other end of the conductive member 20 is electrically connected to a receiver (not shown) mounted on a vehicle. A received signal (high-frequency current) corresponding to a radio wave received by an antenna 70 flows through the conductive member 20. The conductive member 20 is a member including, for example, an electric wire (wire harness), a wiring pattern, a spring, or a transmission line. Specific examples of the electric wire include wiring such as an AV line and an AVSS line. Specific examples of the transmission line include a coaxial cable, a microstrip line, a strip line, a coplanar line, and a slot line.

[0017] An amplifier (not shown) may be connected between the power supply unit 72 and the conductive member 20. The amplifier amplifies a signal corresponding to the radio wave received by the antenna 70 and outputs the amplified signal to the conductive member 20.

[0018] The antenna element 71 is a conductor electrically connected to the power supply portion 72. Although FIG. 1 illustrates a straight antenna element 71, the antenna element 71 may include a curved portion. The antenna element 71 extends along the end edge 42d to the open end 73. The antenna element 71 extends along the end edge 42d and includes a portion that is capacitively coupled with the end edge 42d. By including a portion that is capacitively coupled with the end edge 42d, the antenna gain of the antenna 70 in the frequency band W is improved.

[0019] The parasitic element 60 is a linear conductor provided on the surface or inner layer of the glass plate 43. The parasitic element 60 is arranged away from the antenna element 71 and the feeding portion 72. The parasitic element 60 has a first element 61, a second element 62, and a third element 63. However, the parasitic element 60 may or may not include the third element 63.

[0020] The first element 61 extends in a straight line in the first direction D1 from the first end 81 to the second end 82 through the center of the glass plate 43. The second element 62 is connected to the vicinity of the first end 81 of the first element 61 and includes a portion extending in a second direction D2 different from the first direction D1. The vicinity of the first end 81 refers to the portion of the first element 61 that includes the first end 81. The third element 63 is connected to the vicinity of the second end 82 of the first element 61 and includes a portion extending in a third direction D3 opposite to the second direction D2. The vicinity of the second end 82 refers to the portion of the first element 61 that includes the second end 82. The first element 61 is an element to which no other conductors are connected in an intermediate section 10 that corresponds to 85% of the length L from the first end 81 to the second end 82. The antenna element 71 is located on the opposite side of the second end 82 with respect to the second element 62, and includes a portion that is capacitively coupled with the second element 62. If the parasitic element 60 does not include the third element 63, the second end 82 becomes an open end.

[0021] According to the first embodiment, the first element 61 has no other conductors connected to the intermediate section 10, which is 85% of the length L from the first end 81 to the second end 82, so that even if the first element 61 extends in the first direction D1 through the center of the glass plate 43, the view through the glass plate 43 is unlikely to be obstructed.

[0022] The intermediate section 10 is a portion of the first element 61 extending from the first section end 11 to the second section end 12. The first section end 11 may coincide with the first end 81, and the second section end 12 may coincide with the second end 82. Other conductors, such as branch elements, may be connected to the sections of the first element 61 excluding the intermediate section 10; however, in terms of improving visibility through the glass plate 43, it is preferable that no other conductors be connected. In this example, the section of the first element 61 excluding the intermediate section 10 is the section from the first section end 11 to the first end 81 or the section from the second section end 12 to the second end 82. The length of the intermediate section 10 may be 85% of the length L; however, in terms of improving visibility through the glass plate 43, it is preferable that the length be 90% of the length L, more preferably 95% of the length L, and most preferably 100% of the length L. The length of the intermediate section 10 being 100% of the length L means that the intermediate section 10 coincides with the first element 61. The description of the intermediate section 10 will be used in other embodiments described later.

[0023] The first element 61 may be two lines running parallel to each other with a small gap between them from the first end 81 to the second end 82, but in terms of improving visibility through the glass plate 43, a single line extending from the first end 81 to the second end 82 is preferred.

[0024] Furthermore, if the antenna element 71 has a portion that runs parallel to the parasitic element 60 in close proximity, the electric field near the parallel portion can be strengthened, thereby improving the antenna gain of the antenna 70. In the example shown in Fig. 1, the parallel portion corresponds to the portion that runs parallel to the second element 62.

[0025] Therefore, according to the first embodiment, it is possible to provide a window glass 201 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0026] The frequency band W may be, for example, the UHF (Ultra High Frequency) band with a frequency of 300 MHz to 3 GHz, the VHF (Very High Frequency) band with a frequency of 30 MHz to 300 MHz, or a band spanning both. Specific examples of frequency bands included in the UHF band include the band of terrestrial digital television broadcast waves (e.g., 470 MHz to 710 MHz). Specific examples of frequency bands included in the VHF band include the band of FM broadcast waves (e.g., 76 MHz to 108 MHz) and the band of DAB Band III (e.g., 174 MHz to 240 MHz).

[0027] The length of the antenna element 71 is L H The length of the portion of the parasitic element 60 that is capacitively coupled with the antenna element 71 is L C In this case, L C / L H but L C / L H ≧0.14 ···Equation 1a When the above condition is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved.

[0028] The antenna gain of the antenna 70 in the frequency band W is improved. L C / L H ≧0.16 ···Equation 1b is preferred, L C / L H ≧0.18 ···Equation 1c is more preferred.

[0029] The length of the antenna element 71 is L H The wavelength of the radio wave in the air at the center frequency of a predetermined frequency band W is λ, and the wavelength shortening rate due to the glass plate 43 is k. In this case, L H teeth, 0.03×λ×k≦L H ≦1.30×λ×k ...Formula 2a When the above condition is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved.

[0030] The antenna gain of the antenna 70 in the frequency band W is improved. 0.04×λ×k≦L H ≦1.20×λ×k ...Equation 2b is preferred, 0.05×λ×k≦L H ≦1.10×λ×k ...Formula 2c is more preferred.

[0031] The longest length connecting the two open ends 83 and 84 of the parasitic element 60 is L P The wavelength of the radio wave in the air at the center frequency of a predetermined frequency band W is λ, the wavelength shortening rate due to the glass plate 43 is k, and an integer equal to or greater than 1 is n. P teeth, 0.70×(λ / 2)×k×n≦L P ≦1.30×(λ / 2)×k×n ...Formula 3a When L is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved. P corresponds to the sum of the lengths of the first element 61, the second element 62, and the third element 63. If the parasitic element 60 does not include the third element 63, the second end 82 is an open end, and therefore, L P corresponds to the sum of the lengths of the first element 61 and the second element 62.

[0032] The antenna gain of the antenna 70 in the frequency band W is improved. 0.80×(λ / 2)×k×n≦L P ≦1.20×(λ / 2)×k×n ...Formula 3b is preferred, 0.90×(λ / 2)×k×n≦L P ≦1.10×(λ / 2)×k×n ...Formula 3c is more preferred.

[0033] The third element 63 is provided at a position where it is capacitively coupled to a metal portion (in this example, the edge 42a of the metal body 41) around the glass plate 43 when the glass plate 43 is attached to the vehicle. This improves the antenna gain of the antenna 70 in the frequency band W.

[0034] 1, when glass plate 43 is attached to a vehicle, first element 61 includes a portion extending in a direction approximately perpendicular to the horizontal direction, and second element 62 and third element 63 include portions extending in an approximately horizontal direction. As a result, first element 61 has the effect of improving the antenna gain of vertically polarized waves in frequency band W, and second element 62 and third element 63 have the effect of improving the antenna gain of horizontally polarized waves in frequency band W.

[0035] In FIG. 1, when the glass plate 43 is attached to a vehicle, a metal portion (in this example, the metal body 41) around the glass plate 43 includes an edge 42c in the third direction D3 and an edge 42b in the second direction D2. The edge 42c is an example of a first edge. The edge 42b is an example of a second edge. Here, the center position between the edge 42c and the edge 42b is represented as 0, the position of the edge 42c is represented as -1, and the position of the edge 42b is represented as +1. In this case, if the first element 61 includes a portion located within a range from -0.3 to +0.8, the antenna gain of the antenna 70 in the frequency band W is improved. In terms of improving the antenna gain of the antenna 70 in the frequency band W, it is preferable that the entire first element 61 is located within a range from -0.3 to +0.8. If the position of the first element 61 is out of this range, the first element 61 will approach the end side 42c or the end side 42b, and the antenna gain of the antenna 70 in the frequency band W will decrease.

[0036] Fig. 2 is a diagram showing an example of the configuration of a vehicle window glass according to the second embodiment. In the second embodiment, the description of the configuration, action, and effect similar to those of the first embodiment will be omitted or simplified by incorporating the above description. The window glass 202 shown in Fig. 2 differs from the window glass 201 shown in Fig. 1 in that the third element 63 includes a portion extending in the second direction D2.

[0037] In the second embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the second embodiment, it is possible to provide a window glass 202 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0038] Fig. 3 is a diagram showing an example of the configuration of a vehicle window glass according to a third embodiment. In the third embodiment, the description of the configuration, action, and effect similar to those of the above-mentioned embodiments will be omitted or simplified by citing the above description. The window glass 203 shown in Fig. 3 differs from the window glass 201 shown in Fig. 1 in the extension direction of each element.

[0039] 3, antenna element 71 extends along end 42b to open end 73. Antenna element 71 extends along end 42b and includes a portion that is capacitively coupled to end 42b. By including a portion that is capacitively coupled to end 42b, antenna element 71 improves the antenna gain of antenna 70 in frequency band W.

[0040] 3, the third element 63 is provided at a position where it is capacitively coupled to a metal portion (in this example, the edge 42c of the metal body 41) around the glass plate 43 when the glass plate 43 is attached to the vehicle. This improves the antenna gain of the antenna 70 in the frequency band W.

[0041] 3, when glass plate 43 is attached to a vehicle, first element 61 includes a portion that extends in a substantially horizontal direction, and second element 62 and third element 63 include portions that extend in a direction substantially perpendicular to the horizontal direction. As a result, first element 61 has the effect of improving the antenna gain of horizontally polarized waves in frequency band W, and second element 62 and third element 63 have the effect of improving the antenna gain of vertically polarized waves in frequency band W.

[0042] In FIG. 3 , when the glass plate 43 is attached to a vehicle, the metal portion (in this example, the metal body 41) around the glass plate 43 includes an edge 42d in the third direction D3 and an edge 42a in the second direction D2. The edge 42d is an example of a first edge. The edge 42a is an example of a second edge. Here, the center position between the edge 42d and the edge 42a is represented as 0, the position of the edge 42d is represented as -1, and the position of the edge 42a is represented as +1. In this case, if the first element 61 includes a portion located within a range from -0.3 to +0.8, the antenna gain of the antenna 70 in the frequency band W is improved. In terms of improving the antenna gain of the antenna 70 in the frequency band W, it is preferable that the entire first element 61 is located within a range from -0.3 to +0.8. If the position of the first element 61 is out of this range, the first element 61 will come close to the end side 42d or the end side 42a, and the antenna gain of the antenna 70 in the frequency band W will decrease.

[0043] In the third embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the third embodiment, it is possible to provide a window glass 203 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0044] Fig. 4 is a diagram showing an example of the configuration of a vehicle window glass according to a fourth embodiment. In the fourth 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 204 shown in Fig. 4 differs from the window glass 203 shown in Fig. 3 in that the third element 63 includes a portion extending in the second direction D2.

[0045] In the fourth embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the fourth embodiment, it is possible to provide a window glass 204 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0046] Fig. 5 is a diagram showing an example of the configuration of a vehicle window glass according to a fifth embodiment. In the fifth 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 205 shown in Fig. 5 differs from the window glass 201 shown in Fig. 1 in that the second element 62 and the third element 63 include L-shaped elements.

[0047] The second element 62 includes an L-shaped element that includes a portion 62a extending in the second direction D2 and a portion 62b extending in the first direction D1 along the antenna element 71. The antenna element 71 includes a portion that is capacitively coupled to the portion 62b. The second element 62 includes an L-shaped element that is bent at an end 85. By including the L-shaped element in the second element 62, the area occupied by the parasitic element 60 can be reduced.

[0048] The third element 63 includes an L-shaped element that includes a portion 63a extending in the third direction D3 and a portion 63b extending in a fourth direction D4 opposite to the first direction D1. The third element 63 includes an L-shaped element that is bent at an end 86. By including an L-shaped element in the third element 63, the area occupied by the parasitic element 60 can be reduced.

[0049] In the fifth embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the fifth embodiment, it is possible to provide a window glass 205 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0050] Fig. 6 is a diagram showing an example of the configuration of a vehicle window glass according to a sixth embodiment. In the sixth 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 206 shown in Fig. 6 differs from the window glass 205 shown in Fig. 5 in that the third element 63 includes a portion 63a extending in the second direction D2.

[0051] In the sixth embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the sixth embodiment, it is possible to provide a window glass 206 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0052] Fig. 7 is a diagram showing an example of the configuration of a vehicle window glass according to a seventh embodiment. In the seventh embodiment, the description of the configuration, action, and effect similar to those of the above-mentioned embodiments will be omitted or simplified by citing the above description. The window glass 207 shown in Fig. 7 differs from the window glass 205 shown in Fig. 5 in that the antenna 70 is substantially point-symmetric.

[0053] In the seventh embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the seventh embodiment, it is possible to provide a window glass 207 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0054] FIG. 8 is a diagram showing an example of the configuration of a vehicle window glass according to an eighth embodiment. In the eighth embodiment, the description of the same configuration, action, and effect as those of the above-described embodiments will be omitted or simplified by incorporating the above description. A window glass 208 shown in FIG. 8 differs from the window glass 206 shown in FIG. 6 in that the antenna 70 is upside down. The second element 62 includes an L-shaped element including a portion 62a extending in the third direction D3 and a portion 62b extending in the first direction D1. The third element 63 includes an L-shaped element including a portion 63a extending in the third direction D3 and a portion 63b extending in the fourth direction D4.

[0055] In the eighth embodiment, the first element 61 is also a single line that is not connected to any other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and close to the parasitic element 60. Therefore, according to the eighth embodiment, it is possible to provide a window glass 208 that includes an antenna 70 that receives radio waves in a predetermined frequency band W and that has improved visibility.

[0056] Fig. 9 is a diagram showing an example of the configuration of a vehicle window glass according to a ninth embodiment. In the ninth embodiment, the description of the configuration, action, and effect similar to those of the above-mentioned embodiments will be omitted or simplified by citing the above description. A window glass 209 shown in Fig. 9 differs from the window glass 201 shown in Fig. 1 in the shape of the second element 62.

[0057] The second element 62 includes a portion 62a extending in the second direction D2 from near the first end 81 and a portion 62b extending in the third direction D3 from near the first end 81. The portion 62a extends to the open end 83, and the portion 62b extends to the open end 87.

[0058] The third element 63 may include an L-shaped element, similar to the embodiment of FIG.

[0059] In the parasitic element 60 shown in FIG. 9, the longest length connecting the open end 84 and the open end 83 or the open end 87 is L P In this case, L PIf the above formula 3a is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved. If the parasitic element 60 does not include the third element 63, the second end 82 becomes an open end, and therefore, L P corresponds to the longest length connecting the second end 82 and the open end 83 or the open end 87.

[0060] In the second element 62 shown in FIG. 9, the length extending from the vicinity of the first end 81 in the second direction D2 to the open end 83 is L 22 The length extending from the vicinity of the first end 81 in the third direction D3 to the open end 87 is L 23 , then L 23 / L 22 When L is equal to or greater than 0.80 and equal to or less than 1.20, the antenna gain of the antenna 70 in the frequency band W is improved. 22 corresponds to the length of the portion 62a from the first end 81 to the open end 83, and L 23 corresponds to the length of the portion 62b from the first end 81 to the open end 87. The open end 83 is an example of a first open end. The open end 87 is an example of a second open end.

[0061] The antenna gain of the antenna 70 in the frequency band W is improved. 23 / L 22 is preferably 0.85 or more and 1.15 or less, and more preferably 0.90 or more and 1.10 or less.

[0062] 9, the antenna element 71 includes a portion extending in the third direction D3, and this portion extends in the third direction D3 further than the first end 81. This lengthens the portion of the antenna element 71 that is capacitively coupled with both the parasitic element 60 and the end side 42d, thereby improving the antenna gain of the antenna 70 in the frequency band W.

[0063] With the glass plate 43 attached to the vehicle, the distance between the part of the second element 62 that does not run parallel to the antenna element 71 and the metal part around the glass plate 43 (in this example, the edge 42d) is defined as d. In this case, d is expressed as follows: 0 < d ≤ 0.06 × k × λ ··· Equation 6a When this is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved.

[0064] In terms of the improvement of the antenna gain of the antenna 70 in the frequency band W, 0 < d ≤ 0.05 × k × λ ··· Equation 6b is preferable, 0 < d ≤ 0.04 × k × λ ··· Equation 6c is more preferable.

[0065] In the case of the ninth embodiment as well, the first element 61 is a single wire that is not connected to other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and in proximity to the non-powered element 60. Therefore, according to the ninth embodiment, it is possible to provide the window glass 209 that includes the antenna 70 for receiving radio waves in a predetermined frequency band W and has improved visibility.

[0066] FIG. 10 is a diagram showing a configuration example of a vehicle window glass according to the tenth embodiment. In the tenth embodiment, the description of the same configuration, operation, and effects as in the above embodiments is omitted or simplified by referring to the above description. The window glass 210 shown in FIG. 10 is different from the window glass 209 shown in FIG. 9 in that the third element 63 extends in the second direction D2. The third element 63 may include an L-shaped element in the same form as in FIG. 6.

[0067] In the case of the tenth embodiment as well, the first element 61 is a single wire that is not connected to other conductors from the first end 81 to the second end 82, and the antenna element 71 has a portion that runs parallel to and in proximity to the non-powered element 60. Therefore, according to the tenth embodiment, it is possible to provide the window glass 210 that includes the antenna 70 for receiving radio waves in a predetermined frequency band W and has improved visibility.

[0068] Fig. 11 is a diagram showing an example of the configuration of a vehicle window glass according to an eleventh embodiment. In the eleventh embodiment, the description of the configuration, action, and effect similar to those of the above-mentioned embodiments will be omitted or simplified by citing the above description. A window glass 211 shown in Fig. 11 differs from the window glass 209 shown in Fig. 9 in the shape of the third element 63.

[0069] The third element 63 includes a portion 63c extending in the second direction D2 from near the second end 82 and a portion 63a extending in the third direction D3 from near the second end 82. The portion 63c extends to the open end 88, and the portion 63a extends to the open end 84.

[0070] In the parasitic element 60 shown in FIG. 11, the longest length connecting the open end 84 or the open end 88 and the open end 83 or the open end 87 is L. P In this case, L P If the above formula 3a is satisfied, the antenna gain of the antenna 70 in the frequency band W is improved. If the parasitic element 60 does not include the third element 63, the second end 82 becomes an open end, and therefore, L P corresponds to the longest length connecting the second end 82 and the open end 83 or the open end 87.

[0071] In the third element 63 shown in FIG. 11, the length extending from the vicinity of the second end 82 in the second direction D2 to the open end 88 is L 32 The length extending from the vicinity of the second end 82 in the third direction D3 to the open end 84 is L 33 , then L 33 / L 32 When L is equal to or greater than 0.80 and equal to or less than 1.20, the antenna gain of the antenna 70 in the frequency band W is improved. 32 corresponds to the length of the portion 63c from the second end 82 to the open end 88, and L 33 corresponds to the length of the portion 63a from the second end 82 to the open end 84. The open end 88 is an example of a third open end. The open end 84 is an example of a fourth open end.

[0072] The antenna gain of the antenna 70 in the frequency band W is improved. 33 / L 32 is preferably 0.85 or more and 1.15 or less, and more preferably 0.90 or more and 1.10 or less.

[0073] 12 is a diagram showing an example of the configuration of an antenna 70 provided on a glass plate 43. A power supply portion 72 and an antenna element 71 may be provided on a dielectric plate 44 disposed on the glass plate 43, as shown in FIG.

[0074] The dielectric plate 44 is a layer disposed along the main surface of the glass plate 43. As shown in the figure, the dielectric plate 44 is disposed on a partial region (disposition region) of the main surface of the glass plate 43. The dielectric plate 44 may be in contact with the disposition region, or another layer may be present between the dielectric plate 44 and the disposition region. The dielectric plate 44 may be a sheet-like or foil-like dielectric.

[0075] The antenna 70 may include a coil 30 inserted between the power supply portion 72 and the antenna element 71. The location where the coil 30 is installed is not limited to the dielectric plate 44, and may be other locations such as the main surface of the glass plate 43.

[0076] The coil 30 is a component inserted in series between the antenna element 71 and the conductive member 20. One end of the coil 30 is electrically connected to one end of the antenna element 71, and the other end of the coil 30 is electrically connected to one end of the conductive member 20.

[0077] When the antenna 70 includes the coil 30, the length of the antenna element 71 is L H The wavelength of the radio wave in the air at the center frequency of the frequency band W received by the antenna element 71 is λ, and the wavelength shortening rate determined by the dielectric plate 44 and the glass plate 43 is k.

[0078] At this time, L H teeth, 0.03×λ×k≦L H ≦0.18×λ×k...Equation 7a If the above condition is satisfied, the antenna gain in the frequency band W can be ensured even if the length L of the antenna element 71 is shorter than (λ / 4)×k. H can be made shorter than (λ / 4)×k, so that the antenna 70 capable of receiving radio waves in the frequency band W can be made smaller.

[0079] L H If L is less than 0.03×λ×k, the length at which the antenna element 71 resonates properly will be insufficient, making it difficult to ensure the antenna gain in the frequency band W. H If k exceeds 0.18×λ×k, the area occupied by the antenna element 71 increases, making it difficult to miniaturize the antenna 70.

[0080] In terms of miniaturizing the antenna 70 capable of receiving radio waves in frequency band W, 0.04×λ×k≦L H ≦0.17×λ×k...Equation 7b is preferred, 0.05×λ×k≦L H ≦0.16×λ×k...Equation 7c is more preferred.

[0081] When frequency band W is the band of FM broadcast waves (for example, 76 MHz to 108 MHz), antenna 70 including antenna element 71 that satisfies formula 7a above can be miniaturized if inductance of coil 30 is 0.2 μH or more and 1.2 μH or less. In terms of miniaturizing antenna 70 that can receive radio waves in the band of FM broadcast waves, an inductance of 0.3 μH or more and 1.1 μH or less is preferable, and an inductance of 0.4 μH or more and 1.0 μH or less is more preferable.

[0082] The dielectric plate 44 is a planar layer having a main surface 48 on which the antenna element 71 is formed, and the coil 30 is placed on the main surface 48. By providing the antenna element 71 and the coil 30 on the same main surface 48, the antenna 70 capable of receiving radio waves in the frequency band W can be made smaller.

[0083] The dielectric plate 44 is a layer containing a dielectric as its main component. The dielectric plate 44 may be a glass epoxy substrate such as FR4 or CEM3, or may be made of a resin such as polyimide. Alternatively, the dielectric plate 44 may be made of a fluororesin such as PET (Polyethylene terephthalate) or PTFE (Polytetrafluoroethylene), or a resin such as LCP (Liquid Crystal Polymer) or PPO (Polyphenylenoxide).

[0084] By using a thin glass epoxy substrate with a dielectric layer thickness of 0.07 mm to 1.47 mm (nominal thickness: 0.1 mm to 1.3 mm) for the dielectric plate 44, conformability to the curved surface of the glass plate 43 is improved, facilitating the mounting of the coil 30 and the formation of the antenna element 71. In terms of improving conformability to the curved surface of the glass plate 43, the thickness of the glass epoxy substrate is preferably 1.13 mm or less, more preferably 0.89 mm or less, even more preferably 0.58 mm or less, particularly preferably 0.35 mm or less, and most preferably 0.13 mm or less. Furthermore, glass epoxy substrates are less hygroscopic than polyimide substrates, which are known as flexible substrates, and therefore improve the weather resistance of the antenna 70 against moisture and the like.

[0085] The antenna element 71 and the coil 30 may be provided directly on a glass plate 43 attached to the body of the vehicle. Alternatively, the antenna element 71 may be formed on the inner layer of the glass plate 43.

[0086] The antenna element 71 is not limited to an element provided on a glass plate attached to a vehicle, but may be, for example, a rod antenna extending into the air. A rod antenna is an example of a linear antenna element attached to a vehicle. When the antenna element 71 is a rod antenna, the dielectric adjacent to the antenna element 71 is air, so the wavelength shortening rate k is approximately equal to 1. The antenna element 71 is not limited to a linear antenna conductor, but may be a plate-shaped antenna conductor.

[0087] Fig. 13 shows an example of the simulation results of the antenna gain of vertically polarized waves in the FM broadcast wave band when power is fed from power feeding unit 72 arranged close to edge 42b, which is close to the side edge of glass plate 43, as a reference. In the legend, "209" indicates the case of window glass 209 (Fig. 9), "211" indicates the case of window glass 211 (Fig. 11), and "without parasitic element" indicates the case where parasitic element 60 is removed from window glass 209 (Fig. 9). Fig. 13 shows that adding parasitic element 60 improves the antenna gain of vertically polarized waves in the FM broadcast wave band.

[0088] The conditions for the simulation in Figure 13 are: <Window Glass 209 (Figure 9)> L H :500mm Length from first end 81 to second end 82: 440 mm Length from open end 83 to open end 87: 680 mm Length from second end 82 to open end 84: 210 mm <Window Glass 211 (Figure 11)> L H :500mm Length from first end 81 to second end 82: 440 mm Length from open end 83 to open end 87: 680 mm Length from open end 88 to open end 84: 420 mm <Without parasitic element 60 (Fig. 9)> L H :500mm The wavelength shortening rate k was set to 0.67.

[0089] Fig. 14 shows an example of the simulation results of the antenna gain of vertically polarized waves in the FM broadcast wave band when power is fed from power feeding unit 72 arranged close to the bottom edge of glass plate 43, based on edge 42d that is close to the bottom edge. In the legend, "209" indicates the case of window glass 209 (Fig. 9), and "without parasitic element" indicates the case where parasitic element 60 is removed from window glass 209 (Fig. 9). Fig. 14 shows that adding parasitic element 60 improves the antenna gain of vertically polarized waves in the FM broadcast wave band.

[0090] The conditions for the simulation of FIG. 14 were the same as those for the simulation of FIG. 13, except that the position of the power supply unit 72 was different.

[0091] Fig. 15 shows an example of simulation results of antenna gain for vertically polarized waves in the DAB Band III band when power is fed from power feed unit 72 arranged close to the side of glass plate 43, with edge 42b close to the side as a reference. In the legend, "201" indicates the case of window glass 201 (Fig. 1), and "without parasitic element" indicates the case where parasitic element 60 is removed from window glass 201 (Fig. 1). Fig. 15 shows that adding parasitic element 60 improves the antenna gain for vertically polarized waves in the DAB Band III band.

[0092] The conditions for the simulation in Figure 15 are: <Window glass 201 (Fig. 1)> L H :250mm Length from first end 81 to second end 82: 440 mm Length from first end 81 to open end 83: 340 mm Length from second end 82 to open end 84: 170 mm <Without parasitic element 60 (Fig. 1)> L H :250mm The wavelength shortening rate k was set to 0.67.

[0093] FIG. 16 shows the L C / L H 10 is a diagram showing an example of the results of a simulation of the change in the average antenna gain of vertically polarized waves in the FM broadcast wave band with respect to the change in length L. H The length of the portion of the parasitic element 60 that is capacitively coupled with the antenna element 71 is L C Let's say. L C / L H When the value is ≧0.14, the antenna gain of the antenna 70 in the frequency band W is improved.

[0094] The conditions for the simulation in Figure 16 are: L H :500mm (fixed) Total length of parasitic element 60: 1100mm (fixed) Length from first end 81 to second end 82: 440 mm (fixed) Length from first end 81 to open end 83: Varies Length from second end 82 to open end 84: Varies Wavelength reduction rate k: 0.67 It was decided.

[0095] Fig. 17 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band, when the maximum average value is set to 0 dB, in response to changes in the horizontal position of the first element 61 in the configuration of Fig. 1. Fig. 17 shows that when the horizontal position of the first element 61 is within the range of -0.32 to 0.70, the change in the average value of the antenna gain is within 3 dB.

[0096] The conditions for the simulation in Figure 17 are: L H :500mm (fixed) Total length of parasitic element 60: 1100mm (fixed) Length from first end 81 to second end 82: 440 mm (fixed) Length from first end 81 to open end 83: Varies Length from second end 82 to open end 84: Varies Wavelength reduction rate k: 0.67 It was decided.

[0097] Fig. 18 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band when the maximum average value is set to 0 dB in response to changes in the horizontal position of the first element 61 in the configuration of Fig. 9. Fig. 18 shows that when the horizontal position of the first element 61 is within the range of -0.20 to 0.81, the change in the average value of the antenna gain is within 3 dB.

[0098] The conditions for the simulation in Figure 18 are: L H :500mm (fixed) Length from first end 81 to second end 82: 440 mm (fixed) Length from open end 87 to open end 83: Varies Length from second end 82 to open end 84: Varies Wavelength reduction rate k: 0.67 It was decided.

[0099] Fig. 19 is a diagram showing an example of the results of a simulation of the change in the average value of the antenna gain of vertically polarized waves in the FM broadcast wave band when the maximum average value is set to 0 dB in response to a change in d / (k×λ) in the configuration of Fig. 9. According to Fig. 19, when d / (k×λ) is 0.05 or less, the change in the average value of the antenna gain is within 3 dB.

[0100] The conditions for the simulation in Figure 19 are: L H :500mm (fixed) Length from first end 81 to second end 82: Varies Length from open end 87 to open end 83: 680 mm (fixed) Length from second end 82 to open end 84: Varies d: Change Wavelength reduction rate k: 0.67 It was decided.

[0101] 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. [Explanation of symbols]

[0102] 10 Intermediate Section 11 End of Section 1 12 End of Section 2 20 Conductive material 30 coils 41 Metal Body 42 Aperture 42a,42b,42c,42d Edge 43 Glass Plate 44 Dielectric plate 60 Parasitic element 61 First Element 62 Second Element 63 Third Element 70 Antenna 71 Antenna Element 72 Power supply unit 73 Open end 81 1st end 82 2nd end 201~211 Window glass

Claims

1. A glass plate and an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element including a portion connected to a vicinity of the first end and extending in a second direction different from the first direction or a third direction opposite to the second direction; a third element connected to the vicinity of the second end of the first element and including a portion extending in the second direction or the third direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, The antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element.

2. 2. The vehicle glazing according to claim 1, wherein the third element comprises an L-shaped element including the portion extending in the second direction or the third direction and a portion extending in a fourth direction opposite to the first direction.

3. 3. The vehicle window glass according to claim 1, wherein the third element is provided at a position where it is capacitively coupled to a metal portion around the glass plate when the glass plate is attached to a vehicle.

4. 3. The vehicle window glass according to claim 1, wherein the third element includes a portion extending in the second direction from a vicinity of the second end and a portion extending in the third direction from a vicinity of the second end.

5. In the third element, the length extending from the vicinity of the second end in the second direction to the third open end is L ３２ , the length extending from the vicinity of the second end in the third direction to the fourth open end is L ３３ , then L ３３ / L ３２ The vehicle window glass according to claim 4, wherein is 0.80 or more and 1.20 or less.

6. 3. The vehicle window glass according to claim 1, wherein, when the glass plate is attached to a vehicle, the first element includes a portion extending in a direction approximately perpendicular to a horizontal direction, and the second element and the third element each include a portion extending in a substantially horizontal direction.

7. 3. The vehicle window glass according to claim 1, wherein, when the glass plate is attached to a vehicle, the first element includes a portion that extends in a substantially horizontal direction, and the second element and the third element include portions that extend in a direction that is substantially perpendicular to the horizontal direction.

8. 3. The vehicle window glass according to claim 1, wherein the second element includes an L-shaped element including the portion extending in the second direction or the third direction and a portion extending in the first direction along the capacitively coupled portion.

9. The length of the antenna element is L Ｈ , the length of the portion of the parasitic element that is capacitively coupled with the antenna element is L Ｃ When L Ｃ / L Ｈ ≧0.14 3. The vehicle window glass according to claim 1, wherein the following is satisfied:

10. The length of the antenna element is L Ｈ , where λ is the wavelength of radio waves in the air at the center frequency of the predetermined frequency band, and k is the wavelength shortening rate due to the glass plate, L Ｈ teeth, 0.03×λ×k≦L Ｈ ≦1.30×λ×k 3. The vehicle window glass according to claim 1, wherein the following is satisfied:

11. The longest length connecting the two open ends of the parasitic element is L Ｐ , where λ is the wavelength of radio waves in the air at the center frequency of the predetermined frequency band, k is the wavelength shortening rate due to the glass plate, and n is an integer equal to or greater than 1, Ｐ teeth, 0.70×(λ / 2)×k×n≦L Ｐ ≦1.30×(λ / 2)×k×n 3. The vehicle window glass according to claim 1, wherein the following is satisfied:

12. A glass plate; an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element connected to a portion near the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, the antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element, When the longest length connecting the two open ends of the parasitic element is L P , the wavelength of radio waves in the air at the center frequency of the predetermined frequency band is λ, the wavelength shortening rate due to the glass plate is k, and n is an integer equal to or greater than 1, L P is expressed as follows: 0.70×(λ / 2)×k×n≦L P ≦1.30×(λ / 2)×k×n This vehicle window glass satisfies the above requirements.

13. 3. The vehicle window glass according to claim 1, wherein the second element includes a portion extending in the second direction from a vicinity of the first end and a portion extending in the third direction from a vicinity of the first end.

14. In the second element, the length extending from the vicinity of the first end to the first open end in the second direction is L ２２ , the length extending from the vicinity of the first end in the third direction to the second open end is L ２３ , then L ２３ / L ２２ The vehicle window glass according to claim 11, wherein is 0.80 or more and 1.20 or less.

15. The vehicle window glass according to claim 13, wherein the antenna element extends further in the third direction than the first end.

16. When the glass plate is attached to a vehicle, the distance between the portion of the second element that does not run parallel to the antenna element and the metal portion around the glass plate is d, the wavelength of radio waves in the air at the center frequency of the predetermined frequency band is λ, and the wavelength shortening rate due to the glass plate is k. Then, d is expressed as follows: 0<d≦0.06×k×λ 14. The vehicle window glass according to claim 13, which satisfies the following:

17. When the glass plate is attached to a vehicle, the metal portion on the periphery of the glass plate includes a first end side in the third direction and a second end side in the second direction, When the center position between the first end side and the second end side is represented as 0, the position of the first end side is represented as −1, and the position of the second end side is represented as +1, 3. The vehicle window glass according to claim 1, wherein the first element includes a portion located within a range of -0.3 to +0.

8.

18. A glass plate; an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element connected to a portion near the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, the antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element, When the glass plate is attached to a vehicle, the metal portion on the periphery of the glass plate includes a first end side in the third direction and a second end side in the second direction, When the center position between the first end side and the second end side is represented as 0, the position of the first end side is represented as −1, and the position of the second end side is represented as +1, The first element includes a portion located within a range of -0.3 to +0.8, e.g., a vehicle window glass.

19. The vehicle window glass according to claim 1 or 2, wherein the power supply portion and the antenna element are provided on the glass plate.

20. The vehicle window glass according to claim 1 or 2, wherein the power supply portion and the antenna element are provided on a dielectric plate disposed on the glass plate.

21. A glass plate; an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element connected to a portion near the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, the antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element, The vehicle window glass, wherein the power supply portion and the antenna element are provided on a dielectric plate disposed on the glass plate.

22. The vehicle window glass according to claim 1 or 2, wherein a coil is inserted between the power supply portion and the antenna element.

23. A glass plate; an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element connected to a portion near the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, the antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element, A vehicle window glass, wherein a coil is inserted between the power supply portion and the antenna element.

24. 3. The vehicle window glass according to claim 1, wherein the antenna receives FM broadcast waves.

25. 3. The vehicle window glass according to claim 1, wherein the antenna receives radio waves of DAB Band III.

26. A glass plate; an antenna for receiving radio waves in a predetermined frequency band, The antenna includes a power supply portion and an antenna element electrically connected to the power supply portion. a parasitic element provided on the glass plate, The parasitic element is a first element extending in a straight line in a first direction from a first end to a second end of the central portion of the glass sheet; a second element connected to a portion near the first end and including a portion extending in a second direction different from the first direction or a third direction opposite to the second direction, The first element has an intermediate section of 85% of the length from the first end to the second end to which no other conductor is connected, the antenna element is located on the opposite side of the second element from the second end side and includes a portion that is capacitively coupled with the second element, The vehicle window glass, wherein the antenna receives radio waves of DAB Band III.

27. The vehicle window glass according to claim 1 or 2, wherein the glass plate is used as a side glass.

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