Antenna device with mounting components and mounting structure for the antenna device

Abstract

According to the present invention, an antenna device with an attachment member comprises: an antenna that has a radiation plate that has a radiation surface that radiates vertically-polarized waves; a housing part that houses the antenna; an attachment member that attaches the housing part to a vehicle; and an oblong metal fixing part that is formed at one end of the attachment member and contacts a back surface of the housing part that faces away from the radiation surface so as to fix the housing part. As seen from the plate thickness direction of the radiation plate, the fixing part is arranged between a first region that is formed at the back surface on one side in the extension direction of a first straight line and a second region that is formed at the back surface on the other side in the extension direction of the first straight line.

Description

[Technical Field]

[0001] The present invention relates to an antenna device with mounting members and a mounting structure for an antenna device. [Background technology]

[0002] In recent years, with the increasing level of autonomous driving, vehicles are increasingly being equipped with communication systems that enable V2X (Vehicle to Everything), such as vehicle-to-vehicle communication and vehicle-to-infrastructure communication. Furthermore, it is evolving to acquire various external safety information by utilizing the transmission and reception of narrowband radio waves in the 5.9GHz band.

[0003] In such vehicle communication systems, there is a particular need for a V2X antenna capable of transmitting and receiving vertically polarized signals in a frequency band that satisfies the V2X communication standard (5.8GHz band (Japan) or 5.9GHz band (Europe and America)) with the desired gain. Furthermore, V2X antennas mounted on vehicles require stable directivity that can achieve the desired antenna gain in a range of ±90° (180°) to the left and right of the front of the vehicle (direction of travel) in the horizontal plane.

[0004] Japanese Patent Publication No. 2019-75644 discloses an antenna for V2X communication that is placed inside a vehicle so that the radiating surface of the radiating element faces the windshield or rear window. [Overview of the project] [Problems that the invention aims to solve]

[0005] Incidentally, a metal bracket is preferably used to stably fix the V2X antenna to the vehicle from the inside of the vehicle so that its radiating surface faces the windshield or rear window. However, when a linearly polarized antenna such as a V2X antenna is fixed via such a metal bracket, the transmission and reception characteristics (gain) of radio waves due to the metal may change, reducing the antenna gain and potentially preventing the desired directivity from being obtained.

[0006] Considering the above facts, the present invention aims to provide an antenna device with a mounting member and an antenna device mounting structure that can stably attach an antenna to a vehicle, suppress a decrease in antenna gain, and achieve a desired directivity. [Means for solving the problem]

[0007] The antenna device with a mounting member according to the present invention comprises an antenna having a radiating plate with a radiating surface that radiates linearly polarized waves in a predetermined frequency band, a housing that houses at least a part of the antenna, a mounting member for attaching the housing to a vehicle, and a metal fixing part formed in an elongated shape at one end of the mounting member, which abuts against the back surface of the housing on the side of the radiating plate opposite to the radiating surface side to fix the housing, wherein, when a first straight line passing through the center of gravity of the radiating plate and being the direction of vibration of the linearly polarized waves is defined as viewed from the thickness direction of the radiating plate, and a second straight line perpendicular to the first straight line and passing through the center of gravity, the fixing part is positioned such that its longitudinal direction is along the extension direction of the second straight line, and when viewed from the thickness direction of the radiating plate, the fixing part is positioned between a first region formed on the back surface on one side in the extension direction of the first straight line and a second region formed on the back surface on the other side in the extension direction of the first straight line. [Effects of the Invention]

[0008] According to the antenna device with mounting member of the present invention, the antenna can be stably mounted on a vehicle, a decrease in antenna gain can be suppressed, and a desired directivity can be achieved. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view of a vehicle to which an antenna device with a mounting member according to the first embodiment is attached, as seen from the vertical direction. [Figure 2] This is an exploded cross-sectional view showing the antenna device with mounting members according to the first embodiment attached to a windshield, and shows cross-section AA in Figure 1. [Figure 3]It is an exploded perspective view showing the antenna device with a mounting member according to the first embodiment as viewed obliquely from the rear. [Figure 4] It is a perspective view of the antenna device with a mounting member according to the first embodiment. [Figure 5] It is a plan view showing the antenna according to the first embodiment as viewed from the thickness direction of the radiation plate. [Figure 6] It is a plan view showing the antenna device with a mounting member according to the first embodiment as viewed from the thickness direction of the radiation plate. [Figure 7A] It is a cross-sectional view showing the antenna device of the comparative example / reference example as viewed from the side, showing the antenna device with a mounting member serving as the comparative example. [Figure 7B] It is a cross-sectional view showing the antenna device of the comparative example / reference example as viewed from the side, showing the antenna device without a mounting member serving as the reference example. [Figure 8] It is an analysis diagram showing the analysis result of the directivity characteristics. [Figure 9] It is an exploded cross-sectional view showing the state where the antenna device with a mounting member according to the second embodiment is attached to the windshield, showing the A-A cross-section of FIG. 1. [Figure 10] It is an exploded cross-sectional view showing the state where the antenna device with a mounting member according to the third embodiment is attached to the windshield, showing the A-A cross-section of FIG. 1. [Figure 11] It is a perspective view showing the antenna according to the fourth embodiment as viewed obliquely from the front. [Figure 12] It is a plan view showing the antenna device with a mounting member according to the fourth embodiment as viewed from the thickness direction of the radiation plate. [Figure 13] It is an exploded cross-sectional view showing the state where the antenna device with a mounting member according to another embodiment is attached to the rear glass, showing the B-B cross-section of FIG. 1.

Modes for Carrying Out the Invention

[0010] 〔First Embodiment〕 Hereinafter, the antenna device with a mounting member and the mounting structure of the antenna device according to the first embodiment will be described with reference to the drawings. In each figure, the X-axis appropriately shown is parallel to the vehicle width direction, the Y-axis is parallel to the vehicle longitudinal direction, and the Z-axis is parallel to the vehicle vertical direction. Also, the arrow FR indicates the front in the vehicle longitudinal direction, the arrow UP indicates the upper side in the vehicle vertical direction, and the arrow RH indicates the right side in the vehicle width direction. Further, the XY plane is a plane passing through the X-axis and the Y-axis, the XZ plane is a plane passing through the X-axis and the Z-axis, and the YZ plane is a plane passing through the Y-axis and the Z-axis. In the following description, the vehicle 10 is located on a horizontal plane, the vehicle vertical direction and the vertical direction coincide, and the XY plane and the horizontal plane coincide, and the vertical direction corresponds to the normal direction to the horizontal plane. Also, the direction in which the vertical polarization wave Q vibrates is defined as the vibration direction D. In each figure, for the sake of convenience, the antenna 30 shows only the radiation plate 32, and other configurations are appropriately omitted.

[0011] An example of the antenna device 28 with a mounting member according to the first embodiment being mounted near the upper part (positive Z-axis direction) of the windshield 12 of the vehicle 10 will be described.

[0012] FIG. 1 is a plan view of the vehicle with the antenna device 28 with a mounting member viewed from the vertical direction. As shown in FIG. 1, the vehicle 10 includes a windshield 12 as a glass plate and a rear glass 14. As shown in FIG. 2, the windshield 12 is attached to a metal frame (for example, a metal flange) 16 of the vehicle body by an adhesive such as urethane resin. In the vehicle 10 of FIG. 1, the antenna device with a mounting member 28 (128, 228) is located at the center in the vehicle width direction, but it may also be mounted near the top of the windshield 12, offset from the center in the vehicle width direction (X-axis direction). Similarly, in the vehicle 10 of Figure 1, the antenna device with mounting member 328, which will be described later, may also be mounted near the top of the rear glass 14, offset from the center in the vehicle width direction (X-axis direction). Note that the antenna device with mounting member 328 may be the antenna device with mounting member 28 of this embodiment (antenna devices with mounting members 128, 228, which will be described later). That is, the antenna device with mounting member 28 should be mounted near the top of the windshield 12 and near the top of the rear glass 14, or at least one of the two. Hereafter, unless otherwise specified, the antenna device with mounting member 28 will be described as being mounted near the top of the windshield 12.

[0013] [Configuration of antenna device with mounting components] Figure 2 is an exploded cross-sectional view including the antenna device 28 with mounting member in AA of Figure 1, and Figure 3 is an exploded perspective view showing the antenna device 28 with mounting member viewed from the rear at an oblique angle. As shown in Figures 2 and 3, the antenna device 28 with mounting member comprises an antenna 30, a housing 20 for housing the antenna 30, and a mounting member 40 for attaching the housing 20 to the metal frame 16 of the vehicle 10, and is attached to the vehicle body such as the metal frame 16 by bolts B as fastening members. Alternatively, the mounting member 40 may be attached to the metal frame 16 by weld bolts and nuts welded to the metal frame 16.

[0014] (Antenna 30) Figure 4 is a perspective view showing the antenna device 28 with mounting members, and Figure 5 is a plan view of the antenna 30 as seen from the thickness direction of the radiating plate 32. As shown in Figures 4 and 5, the antenna 30 can be used as a V2X antenna to transmit and receive vertically polarized (an example of linear polarization) Q in the 5.8 GHz band or 5.9 GHz band, for example, in vehicle-to-vehicle communication and vehicle-to-infrastructure communication. Note that the antenna device 28 with mounting members in Figure 4 is shown without the coaxial cable 50 for simplification, but as shown in Figure 3, for example, the coaxial cable 50 extends in the positive Y-axis direction and its end is placed inside the housing 20. The antenna 30 illustrated in Figures 4 and 5 is a slot antenna applicable to a V2X antenna.

[0015] As shown in Figures 4 and 5, the antenna 30 includes a radiating plate (radiating conductor) 32. The front surface of the radiating plate 32 in the vehicle's longitudinal direction constitutes the radiating surface 32A. The radiating surface 32A radiates vertically polarized Q in the 5.8 GHz band or 5.9 GHz band, for example, used in V2X.

[0016] The radiating plate 32 has a slot 32B formed as an opening that divides at least a portion of the radiating surface 32A into a surface portion 35 and a surface portion 36. The slot 32B extends in the direction of extension of the second straight line 72. The surface portion 35 is a conductive portion located on the positive side in the Z-axis direction of the slot 32B. The surface portion 36 is a conductive portion located on the negative side in the Z-axis direction of the slot 32B. The surface portion 35 has a feed point P2, and the surface portion 36 has a feed point P3. In the antenna 30 shown in Figure 5, the slot 32B extends parallel to the second straight line 72, but it may also be an opening that is parallel to the second straight line 72 but does not overlap with the second straight line 72, or an opening that extends at an acute angle greater than 0° oblique to the second straight line 72.

[0017] The pair of feed points P2 and P3 are the points where the coaxial cable 50 is electrically connected. Feed point P2 is electrically connected to the ground portion of the coaxial cable 50. Feed point P3 is electrically connected to the signal line of the coaxial cable 50. Alternatively, feed point P2 may be electrically connected to the signal line of the coaxial cable 50, in which case feed point P3 is electrically connected to the ground portion of the coaxial cable 50.

[0018] Figure 6 is a plan view of the antenna device 28 with mounting members, viewed from the plate thickness direction opposite to the radiating surface 32A side of the radiating plate 32. Here, as shown in Figures 5 and 6, the first straight line 71 is defined as the straight line that passes through the centroid P1 of the radiating plate 32 and whose direction of vibration D is that of the vertical polarization Q, viewed from the plate thickness direction of the radiating plate 32. The second straight line 72 is defined as the straight line perpendicular to the first straight line 71 and passing through the centroid P1 of the radiating plate 32.

[0019] Viewed from the thickness direction of the radiating plate 32, the feed points P2 and P3 of the antenna 30 are located at positions different from the centroid P1 of the radiating plate 32 and are positioned on the first straight line 71. That is, the first straight line 71 can be a straight line that passes through the centroid P1 of the radiating plate 32 and the feed point P2 or the feed point P3 when viewed from the thickness direction of the radiating plate 32. Also, as shown in Figure 5, the first straight line 71 can be a straight line that extends in a direction perpendicular to the longitudinal direction of the slot 32B. Note that the slot 32B may be positioned offset in the Z-axis direction from the second straight line and extending in the vehicle width direction (X-axis direction), in which case either the feed point P2 or the feed point P3 may coincide with the centroid P1. Even in that case, the centroid P1 and the feed points P2 and P3 are positioned on the first straight line 71.

[0020] (Storage section 20) As shown in Figures 2 and 4, the housing section 20 is made of, for example, resin, and is formed in a box shape with a case section 22 and a cover section 24.

[0021] <Case section 22> As shown in Figures 3 and 4, the case portion 22 is formed in the shape of a box with an open rear surface in the vehicle's longitudinal direction, and the antenna 30 is housed inside the case portion 22. On both sides of the case portion 22 in the vehicle's width direction, protrusions 22A that project outward in the vehicle's width direction may be formed. As shown in Figure 6, the protrusions 22A project along the second straight line 72 when viewed from the thickness direction of the radiating plate 32. The case portion 22 may be formed in the shape of a box with an open front surface, and is not limited to a configuration that completely covers the antenna 30, but may have a portion that is not covered.

[0022] <Cover section 24> As shown in Figures 3 and 4, the cover portion 24 is formed in a plate shape and is attached to the case portion 22 on the opposite side from the radiating surface 32A of the radiating plate 32 of the antenna 30, so as to cover the opening of the case portion 22. On both sides of the cover portion 24 in the vehicle width direction, protrusions 24A are formed that project outward in the vehicle width direction. As shown in Figure 6, the protrusions 24A project along the second straight line 72 when viewed from the plate thickness direction of the radiating plate 32. The protrusions 22A and 24A constitute the protruding portion 25A of the housing portion 20.

[0023] As shown in Figure 3, the protruding portion 25A has a mounting hole 25B formed therein, which serves as a mounting portion for attaching the fixing portion 44 to the housing portion 20. The fixing portion 44 is attached to the housing portion 20 by fastening the cover portion 24 and the fixing portion 44 together with a screw S, which is a metal fastening member, through the mounting hole 25B. Note that the attachment of the fixing portion 44 to the housing portion 20 is not limited to fastening with a screw S; various fixing structures can be used as long as they can be mechanically fixed.

[0024] The cover portion 24 may have a cylindrical boss 24C extending to the rear of the vehicle on its rear surface 24B in the vehicle's longitudinal direction. The opening 24D inside the boss 24C is formed to penetrate the cover portion 24. One end of the coaxial cable 50, which serves as the power supply line, is inserted into the opening 24D and electrically connected to power supply points P2 and P3. The other end of the coaxial cable 50 is connected to a control device that controls the signals transmitted and received by the antenna 30. The opening provided on the rear surface 24B of the cover portion 24 may be of any shape, and the presence or absence of the boss 24C is irrelevant. Furthermore, the power supply line is not limited to a coaxial cable, but can also be a stripline. Various transmission lines for high-frequency signal communication can be used, such as microstrip lines, coplanar waveguides, GCPW (Ground Plane Coplanar Waveguide), coplanar strips, slot lines, and waveguides.

[0025] (Mounting component 40) As shown in Figure 2, the mounting member 40 connects the housing section 20 to the metal frame 16 of the vehicle 10. The mounting member 40 is made of metal and consists of a mounting section 42, a fixing section 44, an extension section 46, and a connecting section 48. The mounting member 40 may be formed by mechanically joining multiple types of metal or by welding. Furthermore, if the mounting member 40 is made by joining multiple materials including metal, it may also contain some resin. However, from the viewpoint of obtaining high rigidity, it is preferable that the mounting member 40 be integrally formed from metal. Hereafter, unless otherwise specified, the mounting member 40 is assumed to be integrally formed from metal.

[0026] <Mounting part 42> As shown in Figure 2, the mounting portion 42 is formed at one end of the mounting member 40. As shown in Figures 3 and 4, the mounting portion 42 is formed in the shape of a long rectangular plate extending in the vehicle width direction. The mounting portion 42 may include a through hole 42A that penetrates in the plate thickness direction and an extended portion 42B that extends from near the side surface of the mounting portion 42 toward approximately the upper part of the vehicle.

[0027] The through-hole 42A is formed to the right in the vehicle width direction from the extension portion 46. As shown in Figure 2, the mounting member 40 is attached to the metal frame 16 of the vehicle 10 by a bolt B, which is a fastening member inserted into the through-hole 42A. The through-hole 42A may also be formed to the left in the vehicle width direction from the extension portion 46, or on both sides in the vehicle width direction.

[0028] The extended portion 42B contacts a protrusion (not shown) of the metal frame 16, making it easier to position the mounting member 40 relative to the vehicle body.

[0029] <Fixed part 44> As shown in Figure 2, the fixing portion 44 is formed at the other end of the mounting member 40. In the cross-sectional view shown in Figure 2, the fixing portion 44 is formed to extend in the vertical direction (Z-axis direction). Figure 2 is an example in which the cross-section of the case portion 22 is rectangular, and the fixing portion 44 is approximately parallel to the radiating surface 32A of the radiating plate 32 in the cross-section of the case portion 22. Note that the case portion 22 may not be a rectangular parallelepiped, and the fixing portion 44 and the radiating surface 32A may be non-parallel in the cross-section, but even in that case, as will be described later, the radiating surface 32A only needs to be within a range of ±15° with respect to the vertical direction. Also, as shown in Figures 3 and 4, the fixing portion 44 is formed in a long, elongated shape extending in the vehicle width direction, particularly in the shape of a long rectangular plate, but this shape can be designed arbitrarily. Note that the longitudinal direction of the fixing portion 44 should be aligned with the extension direction of the second straight line 72.

[0030] Furthermore, through holes 44A extending in the thickness direction are formed near both ends of the fixing portion 44 in the longitudinal direction. One through hole 44A is formed at a position corresponding to one mounting hole 25B, and the other through hole 44A is formed at a position corresponding to the other mounting hole 25B.

[0031] The fixing part 44 is in contact with the back surface 24B of the housing part 20, which is on the opposite side of the radiating surface 32A from the radiating plate 32, and a screw S is attached to the mounting hole 25B. In this way, the cover part 24 and the fixing part 44 are fastened together, and the fixing part 44 is attached to the housing part 20.

[0032] As shown in Figure 6, when viewed from the thickness direction of the radiating plate 32, the fixing portion 44 is positioned such that the longitudinal axis 44C of the fixing portion 44 coincides with the second straight line 72. In other words, when viewed from the thickness direction of the radiating plate 32, it is preferable that the fixing portion 44 is positioned such that the longitudinal axis 44C of the fixing portion 44 coincides with the second straight line 72.

[0033] Furthermore, when viewed from the thickness direction of the radiating plate 32, a slight deviation of the fixing portion 44 is acceptable as long as the longitudinal axis 44C of the fixing portion 44 is aligned with the second straight line 72. In other words, when viewed from the thickness direction of the radiating plate 32, the fixing portion 44 may be positioned such that the longitudinal axis 44C of the fixing portion 44 does not coincide with the second straight line 72. However, it is sufficient that the fixing portion 44 is positioned so as to coincide with the second straight line 72, and even if the second straight line 72 and the axis 44C do not perfectly coincide, it is preferable that they are in a parallel positional relationship when viewed from the thickness direction of the radiating plate 32.

[0034] Furthermore, if the fixing portion 44 is formed symmetrically with respect to the second straight line 72 when viewed from the thickness direction of the radiating plate 32, the antenna 30 can be made to secure the desired antenna gain and the desired directivity, as will be described later. Moreover, it is even more preferable if the fixing portion 44 is formed symmetrically with respect to the first straight line 71 when viewed from the thickness direction of the radiating plate 32.

[0035] The fixing portion 44 may have an opening 44B that opens in the thickness direction of the plate, near the center of gravity P1 of the radiating plate 32. The opening 44B is preferably a through hole or notch larger than the outer diameter of the coaxial cable 50. In this case, the coaxial cable 50 is easily connected to the antenna 30 by passing through the opening 44B and the back surface 24B. The fixing portion 44 does not have to have an opening 44B, in which case the coaxial cable 50 may be connected to the antenna 30 from above the housing portion 20 (along the negative Z-axis direction) via a through hole not shown.

[0036] As shown in Figures 3, 4, and 6, when viewed from the thickness direction of the radiating plate 32, the fixing portion 44 is positioned between a first region 61 formed on the back surface 24B on one side in the extending direction of the first straight line 71 and a second region 62 formed on the back surface 24B on the other side in the extending direction of the first straight line 71. In other words, when viewed from the thickness direction of the radiating plate 32, the fixing portion 44 is positioned on the back surface 24B such that it has the first region 61 and the second region 62 on both sides in the extending direction of the first straight line 71 (both sides in the width direction of the fixing portion 44).

[0037] Furthermore, as shown in Figure 6, the width W of the fixing portion 44 along the first straight line 71 is the width L of the radiating plate 32 along the first straight line 71. S It is formed to be narrower. Note that the width W of the fixing portion 44 is not limited to a constant width, but may have different widths.

[0038] The width W of the fixing part 44 along the first straight line 71 and the width L of the radiating plate 32 along the first straight line 71 S This means that the following equation (1a) is satisfied, equation (1b) is preferred, and equation (1c) is more preferred. W / L S If the W / L ratio is less than 0.01, the fixing strength between the fixing part 44 and the housing part 20 may be weak and unstable. S If the value exceeds 0.75, the antenna gain of antenna 30 may decrease. 0.01 ≤ W / L S ≤0.75 ···(1a) 0.05 ≤ W / L S ≤0.65 ···(1b) 0.10 ≤ W / L S ≤0.50 ···(1c)

[0039] <Extension part 46> As shown in Figures 2 and 4, the extension portion 46 is formed by extending from the upper end of the fixed portion 44 in the vehicle's vertical direction, away from the radiating plate 32. In particular, when the back surface 24B is a plane substantially parallel to the radiating surface 32A, the extension portion 46 extends away from the radiating plate 32 so as not to contact the back surface 24B. In this case, the extension portion 46 is formed by extending from the upper end of the fixed portion 44 in the vehicle's vertical direction toward the rear of the vehicle. The extension portion 46 is formed so as not to contact the first region 61 and the second region 62. The extension portion 46 may also be formed by extending from the lower end of the fixed portion 44 in the vehicle's vertical direction, or from any position between the upper and lower ends, away from the radiating plate 32.

[0040] As shown in Figures 2 and 4, in a cross-section along the YZ plane, the mounting member 40 is formed in a substantially L-shape by the extension portion 46 and the fixing portion 44, but is not limited to a substantially L-shape. For example, the extension portion 46 may be formed in a substantially T-shape, extending from between the upper and lower ends of the fixing portion 44 in the vehicle's vertical direction. Furthermore, the width of the extension portion 46 in the vehicle width direction is not particularly limited as long as the desired rigidity of the mounting member 40 can be obtained, but may be, for example, approximately the same as the width of the radial plate 32 in the vehicle width direction.

[0041] <Connection part> As shown in Figures 2 and 4, the connecting portion 48 connects one rear end of the extension portion 46 in the vehicle longitudinal direction to one rear end of the mounting portion 42 in the vehicle longitudinal direction. The width of the connecting portion 48 in the vehicle width direction is not particularly limited as long as the mounting member 40 can obtain the desired rigidity, but for example it may be approximately the same as the width of the extension portion 46 in the vehicle width direction. In a cross-section according to the YZ plane, the mounting member 40 is formed in a substantially U shape by the mounting portion 42, the extension portion 46, and the connecting portion 48, but it may also be formed in a substantially J shape.

[0042] The antenna device 28 with mounting members configured in this way is mounted on the metal frame 16 such that the angle α of the radiating surface 32A with respect to the vertical direction is within ±15°, as shown in Figure 2. In other words, the antenna device 28 with mounting members is mounted on the metal frame 16 such that the first straight line 71 is within a range of ±15° with respect to the vertical direction of the vehicle. The antenna device 28 with mounting members is mounted on the metal frame 16 such that the radiating surface 32A of the radiating plate 32 is spaced apart from the windshield 12. The angle α of the radiating surface 32A with respect to the vertical direction is preferably within ±10°, more preferably within ±5°, even more preferably within ±3°, particularly preferably within ±1°, and most preferably 0°.

[0043] The antenna device 28 with mounting members may also be mounted near the rear window 14. In this case, if the antenna device 28 with mounting members is placed inside the vehicle, it is preferable to place it in an area of ​​the main surface of the rear window 14 where there are no conductors (conducting wires) such as defoggers (heating wires), as this makes it less likely for the antenna gain to decrease.

[0044] [Directivity analysis] The following describes the directional analysis performed to confirm the effectiveness of the antenna device 28 with mounting member and the mounting structure of the antenna device 28 according to the first embodiment.

[0045] Figure 7A is a cross-sectional view of an antenna device with a mounting component, which is a comparative example, and Figure 7B is a cross-sectional view of an antenna device without a mounting component, which is a reference example. For the directivity analysis, we prepared the antenna device 28 with a mounting component, which is an embodiment of the first embodiment, the antenna device 528 with a mounting component, which is a comparative example, which is a comparative example, and the antenna device 628 without a mounting component, which is a reference example, which is a reference example. Note that the detailed illustration of the connection between the coaxial cable 50 and the antenna 30 is omitted in Figures 7A and 7B.

[0046] In the antenna device 28 with mounting member of "Example 1," which is an embodiment, the width W along the first straight line 71 of the fixing part 44 is 10.0 mm, and the width L along the first straight line 71 of the radiating plate 32 is 10.0 mm. SThe length was set to 14.8 mm. The fixing portion 44 was positioned such that its longitudinal axis 44C coincided with the second straight line 72. Furthermore, the extension portion 46 (shown in Figure 2) was equipped with a mounting member 40 that extended away from the radiating plate 32 at an angle of approximately 90° to the back surface 24B.

[0047] As shown in Figure 7A, the antenna device 528 with mounting member of "Example 2," which serves as a comparative example, has a fixing portion 544 that is in complete contact with the first region 61 formed on the back surface 24B of the housing portion 20. The mounting member 540 is formed in a substantially L-shape in a cross-section along the YZ plane, consisting of the mounting portion 42 and the fixing portion 544.

[0048] The antenna device 628 without mounting members in "Example 3," which serves as a reference example, is a model that does not have a fixing part on the back surface 24B of the housing, as can be seen in Figure 7B.

[0049] Here, we performed a directivity analysis of vertical polarization Q at 5.9 GHz in the horizontal plane for antenna devices 28 with mounting members, antenna devices 528 with mounting members, and antenna device 628 without mounting members.

[0050] Figure 8 is a graph showing the horizontal plane directivity characteristics of each antenna device from "Example 1" to "Example 3" as viewed from the vertical direction of the vehicle. As shown by the dashed line in Figure 8, the antenna device 628 of "Example 3," which is a reference example and does not have a mounting member, can be seen to obtain an antenna gain of approximately the same magnitude without bias in the direction of ±90° to the left and right, centered on the front of the vehicle, that is, excellent directivity within a predetermined angular range in the horizontal plane.

[0051] As shown by the solid line in Figure 8, the antenna device 28 with mounting member of "Example 1," which is an embodiment, also provides an antenna gain of approximately the same magnitude without bias in the direction of ±90° to the left and right, centered on the front of the vehicle, that is, excellent directivity within a predetermined angular range in the horizontal plane. Thus, the antenna device 28 with mounting member of the embodiment provides approximately the same antenna gain and approximately the same directivity as the antenna device 628 without mounting member of the reference example.

[0052] On the other hand, as shown by the dashed line in Figure 8, the antenna device 528 with mounting member of "Example 2," which is a comparative example, shows reduced antenna gain on the right side (RH) and left side (LH) of the vehicle, and distortion of directivity, compared to "Example 1." Therefore, the antenna device 28 with mounting member of "Example 1," which is an embodiment, can obtain the desired antenna gain and excellent directivity over a predetermined angular range (LH side to FR side to RH side).

[0053] [Operation of the First Embodiment] Next, the operation and effects of the antenna device 28 with mounting member and the mounting structure of the antenna device 28 according to the first embodiment will be described.

[0054] By making the fixing part 44 out of metal, and especially by making the mounting member 40 out of metal and integrated into a single unit, the housing part 20 is firmly fixed to the mounting member 40. As a result, the antenna device with mounting member (antenna 30) can be stably attached to the vehicle 10.

[0055] Furthermore, in the antenna device 28 with mounting members, the fixing part 44 is positioned between the first region 61 and the second region 62, so that in the extension direction of the first straight line 71, the first region 61 and the second region 62 are formed on the back surfaces 24B of the housing parts 20 on both sides of the fixing part 44, where the metal fixing part 44 is not positioned. In other words, in the antenna device 28 with mounting members, when the antenna 30 transmits and receives vertically polarized Q and current flows in the direction D of the vibration of vertically polarized Q, the metal fixing part 44 is not formed at the open end where the electric field becomes strong. Therefore, in the antenna device 28 with mounting members, changes in the transmission and reception characteristics of vertically polarized Q due to the metal fixing part 44 are suppressed, the antenna 30 can be stably mounted on the vehicle 10, a decrease in antenna gain can be suppressed, and consequently, the desired antenna directivity can be ensured.

[0056] In the antenna device 28 with mounting members, the fixing part 44 is positioned such that its longitudinal axis 44C coincides with the second straight line 72. As a result, in the extension direction of the first straight line 71, the first region 61 and the second region 62, where the metal fixing part 44 is not positioned, are approximately the same size. Furthermore, the region where the first region 61 and the radiating plate 32, which is the conductor of the antenna 30, overlap, and the region where the second region 62 and the radiating plate 32, which is the conductor of the antenna 30, overlap, are approximately the same shape and area. Therefore, in the antenna device 28 with mounting members, the change in the transmission and reception characteristics of vertical polarization Q due to the metal fixing part 44 is further suppressed, the decrease in antenna gain is further suppressed, and consequently, the desired antenna directivity can be ensured.

[0057] The fixing part 44 and the radiating plate 32 are configured such that the width W of the fixing part 44 (of the first straight line 71) satisfies equation (1a) above. In this way, the antenna device 28 with mounting member can maintain rigidity while suppressing a decrease in antenna gain, and consequently ensuring stable directivity.

[0058] The fixing part 44 and the housing part 20 are attached via metal screws S, with mounting holes 25B formed in the protruding part 25A for attaching the fixing part 44 to the housing part 20, so that the metal screws S are attached at a position away from the radiating plate 32. As a result, the antenna device 28 with mounting members suppresses changes in the transmission and reception characteristics of vertical polarization Q caused by the metal screws S, suppresses a decrease in antenna gain, and consequently ensures stable directivity.

[0059] In the antenna device 28 with mounting members, the fixing part 44 is symmetrical with respect to the second straight line 72, so that the first region 61 and the second region 62, where the fixing part 44 is not located, are approximately the same size on both sides in the width direction of the metal fixing part 44. Therefore, in the antenna device 28 with mounting members, changes in the transmission and reception characteristics of vertical polarization Q due to the metal fixing part 44 are suppressed, the decrease in antenna gain can be further suppressed, and consequently, stable directivity can be ensured.

[0060] The fixed portion 44 has an opening 44B, which provides space for electrically connecting the coaxial cable 50 to feed points P2 and P3. This makes it easier to connect the coaxial cable 50 to the predetermined position. The antenna device 28 with mounting member may further include a connector (not shown) for fixing the coaxial cable 50 and connecting it to feed points P2 and P3.

[0061] In the antenna device 28 with mounting member, the mounting member 40 is made of metal, so the housing 20 is firmly fixed to the vehicle 10 by the mounting member 40. Therefore, the antenna 30 is stably attached to the vehicle 10.

[0062] Furthermore, the antenna device 28 with mounting member has high rigidity because the mounting member 40 is integrally formed from metal, so the antenna 30 can be stably mounted in the desired position and orientation.

[0063] The antenna device 28 with mounting members allows the antenna 30 to be firmly fixed to the vehicle 10 via a metal extension 46. Furthermore, since the extension 46 extends away from the radiating plate 32, the antenna device 28 with mounting members suppresses changes in the transmission and reception characteristics of vertical polarization Q caused by the metal extension 46, thereby suppressing a decrease in antenna gain and ensuring stable directivity.

[0064] Furthermore, the antenna device 28 with mounting members is installed such that the radiating surface 32A is within ±15° of the vertical direction, so that the radiating surface 32A is oriented in a substantially horizontal direction. Therefore, the radiating surface 32A can transmit and receive vertically polarized Q that propagates in a substantially horizontal direction.

[0065] [Second Embodiment] The antenna device with mounting member and the mounting structure of the antenna device in the second embodiment differ from the first embodiment in that the configuration of the mounting member is different. In addition, the same terms or reference numerals will be used to describe parts that are the same as or equivalent to those described in the first embodiment, and the same configurations and effects as in the above embodiment will not be described.

[0066] (Mounting components) Figure 9 is an exploded cross-sectional view of Figure 1AA, including the antenna device 128 with mounting member. As shown in Figure 9, the antenna device 128 with mounting member has a mounting member 140 which is integrally formed from metal and has a mounting portion 42, a fixing portion 44, an extension portion 146, and a connecting portion 48.

[0067] The extended portion 146 is formed by extending from the upper end of the fixing portion 44 in the vehicle vertical direction away from the radiation plate 32, so as not to contact the back surface 24B. Alternatively, the extended portion 146 may be formed by extending from the lower end of the fixing portion 44 in the vehicle vertical direction, or from between the upper and lower ends of the fixing portion 44 in the vehicle vertical direction away from the radiation plate 32. The extended portion 146 is formed by extending from the upper end of the fixing portion 44 in the vehicle vertical direction diagonally upward and rearward of the vehicle 10. The extended portion 146 is formed so as not to contact the first region 61 and the second region 62.

[0068] The mounting angle of the windshield 12 is, for example, 23° relative to the horizontal plane (XY plane) for sedan-type vehicles, and for example, 50° relative to the horizontal plane for wagon-type kei cars. The mounting angle of the rear glass 14 is, for example, 18° relative to the horizontal plane for sedan-type vehicles, and for example, 45° relative to the horizontal plane for hatchback-type vehicles.

[0069] The antenna device 128 with mounting members allows the angle θ1 between the extension portion 146 and the radiating surface 32A to be adjusted within a range of 20° to 160°, depending on the mounting angle of the windshield 12 or the rear glass 14. Note that, in the cross-section shown in Figure 9, if the case portion 22 is substantially rectangular and the radiating surface 32A and the fixing portion 44 are substantially parallel along the vertical direction, then angle θ1 can also be expressed as the angle between the extension portion 146 and the fixing portion 44. Furthermore, with the mounting member 140 attached to the metal frame 16, the antenna device 128 allows the angle θ2 in the direction of extension of the extension portion 146 relative to the horizontal plane to be adjusted, for example, within a range of -30° to 70°.

[0070] [Operation of the second embodiment] Next, the operation and effects of the antenna device 128 with mounting member and the mounting structure of the antenna device 128 according to the second embodiment will be described.

[0071] In the antenna device 128 with mounting members, if the angle θ1 between the extension portion 146 and the radiating surface 32A is in the range of 20° to 160°, the metal extension portion 146 is positioned away from the first region 61 and the second region 62. Therefore, the antenna device 128 with mounting members suppresses changes in the transmission and reception characteristics of vertical polarization Q due to the metal extension portion 146, suppresses a decrease in antenna gain, and consequently ensures stable directivity. Note that θ1 may also be in the range of 90° to 135° or in the range of 45° to 90°.

[0072] Furthermore, in the antenna device 128 with mounting members, if the extension direction of the extension portion 146 is in the range of -30° to 70° with respect to the horizontal plane, the metal extension portion 146 is positioned away from the first region 61 and the second region 62. Therefore, the antenna device 128 with mounting members suppresses changes in the transmission and reception characteristics of vertical polarization Q due to the metal extension portion 146, suppresses a decrease in antenna gain, and consequently ensures stable directivity. Note that θ2 may be in the range of 0° to 45° or in the range of -30° to 0°.

[0073] [Third Embodiment] The antenna device with mounting member and the mounting structure of the antenna device of the third embodiment differ from the antenna device with mounting member and the mounting structure of the antenna device of the above embodiment in that the configuration of the mounting member is different. Furthermore, the same terms or reference numerals will be used to describe parts that are the same as or equivalent to those described in the above embodiment, and the same configuration and effects as in the above embodiment will be described accordingly. I will omit the explanation.

[0074] (Mounting components) Figure 10 is an exploded cross-sectional view of the antenna device 228 with mounting member in Figure 1AA. As shown in Figure 10, the mounting member 240 of the antenna device 228 with mounting member is made of metal and integrally formed, and consists of a mounting portion 42, a fixing portion 44, an extension portion 246, and a connecting portion 48.

[0075] The extended portion 246 is formed by extending from the lower end of the fixing portion 44 in the vehicle's vertical direction toward the radial plate 32, so as not to contact the rear surface 24B. The extended portion 246 is formed by extending from the lower end of the fixing portion 44 in the vehicle's vertical direction toward the rearward and diagonally downward of the vehicle 10. The extended portion 246 is formed so as not to contact the first region 61 and the second region 62.

[0076] The angle θ3 between the extension portion 246 and the radiating surface 32A can be adjusted within the range of 20° to 160°. Note that, in the cross-section shown in Figure 10, if the case portion 22 is substantially rectangular and the radiating surface 32A and the fixed portion 44 are substantially parallel along the vertical direction, then angle θ3 can also be described as the angle between the extension portion 246 and the fixed portion 44. Furthermore, in the antenna device with mounting member 228, with the mounting member 240 attached to the metal frame 16, the angle θ4 in the direction in which the extension portion 246 extends relative to the horizontal plane can be adjusted within the range of -30° to 70°. Note that θ4 is a negative angle when the direction in which the extension portion 246 moves away from the fixed portion 44B is a downward angle relative to the horizontal plane, and a positive angle when the direction in which the extension portion 246 moves away from the fixed portion 44B is an upward angle.

[0077] Even with this configuration, if the angle θ3 between the extension portion 246 and the fixed portion 44 of the antenna device 228 with mounting members is in the range of 20° to 160°, the metal extension portion 246 is positioned away from the first region 61 and the second region 62. Therefore, the change in the transmission and reception characteristics of vertical polarization Q due to the metal extension portion 346 of the antenna device 228 with mounting members is suppressed, the decrease in antenna gain is suppressed, and consequently, stable directivity is ensured. Note that θ3 may also be in the range of 90° to 135° or in the range of 45° to 90°.

[0078] Furthermore, in the antenna device 228 with mounting members, if the extension direction of the extension portion 246 is in the range of -30° to 70° with respect to the horizontal plane, the metal extension portion 246 is positioned away from the first region 61 and the second region 62. Therefore, the antenna device 228 with mounting members suppresses changes in the transmission and reception characteristics of vertical polarization Q due to the metal extension portion 246, suppresses a decrease in antenna gain, and consequently ensures stable directivity. Note that θ4 may be in the range of 0° to 45°, or in the range of -30° to 0°.

[0079] [Fourth Embodiment] The antenna device with mounting member and the mounting structure of the antenna device in the fourth embodiment differ from the antenna device with mounting member and the mounting structure of the antenna device in the above embodiment in that the antenna configuration is different.

[0080] [Configuration of antenna device with mounting components] The configuration of the antenna device with mounting member and the mounting structure of the antenna device according to the fourth embodiment will be described below. Note that the same or equivalent parts as those described in the above embodiments will be described using the same terms or reference numerals, and the same configurations and effects as those described in the above embodiments will be omitted from the description.

[0081] Figure 11 is a perspective view of antenna 130. As shown in Figure 11, antenna 130 consists of a radiating plate (radiating conductor) 132, a dielectric substrate 134, a grounding conductor plate 135, and a connecting conductor. A patch antenna (microstrip antenna) comprising 136 and

[0082] The dielectric substrate 134 is a dielectric layer mainly composed of a dielectric. A radiation plate 132 is provided on the surface (first main surface) of the dielectric substrate 134. The radiation plate 132 functions as a radiation element of the antenna 130. A ground conductor plate 135 is provided on the back surface (second main surface) of the dielectric substrate 134. The ground conductor plate 135 is connected to the ground covering wire of the coaxial cable 50.

[0083] The connection conductor 136 connects the power supply point P2 of the radiation plate 132 and the signal line (core wire) of the coaxial cable 50. Note that the connection conductor 136 does not contact the ground conductor plate 135.

[0084] The front surface of the radiation plate 132 in the vehicle front-rear direction constitutes a radiation surface 132A. The radiation surface 132A radiates a vertically polarized wave Q in the 5.8 GHz band or 5.9 GHz band used for vehicle-to-vehicle communication and roadside-to-vehicle communication, etc. The antenna 130 includes a ground conductor plate 135 via the dielectric substrate 134 on the side opposite to the side where the radiation surface 132A is disposed with respect to the radiation plate 132.

[0085] As shown in FIG. 12, when viewed from the thickness direction of the radiation plate 132, the power supply point P2 of the antenna 130 is at a position different from the centroid P1 of the radiation plate 132 and is disposed on the first straight line 71.

[0086] The width W of the fixing portion 44 in the extending direction of the first straight line 71 is smaller than the width L of the ground conductor plate 135 in the extending direction of the first straight line 71 P and is formed to be narrower.

[0087] Figure 12 is a plan view of the antenna device with mounting members, viewed from the plate thickness direction opposite to the radiating surface 132A side of the radiating plate 132. As shown in Figure 12, in the antenna device with mounting members of the fourth embodiment, the fixing part 44 is positioned such that its longitudinal axis 44C coincides with the second straight line 72. As a result, in the extension direction of the first straight line 71, the first region 61 and the second region 62, where the metal fixing part 44 is not positioned, are approximately the same size. Furthermore, the region where the first region 61 and the grounding conductor plate 135, which is the conductor of the antenna 30, overlap, and the region where the second region 62 and the grounding conductor plate 135, which is the conductor of the antenna 30, overlap, are approximately the same shape and area. Therefore, in the antenna device with mounting members of the fourth embodiment, the change in the transmission and reception characteristics of vertical polarization Q due to the metal fixing part 44 is further suppressed, the decrease in antenna gain can be further suppressed, and consequently, the desired antenna directivity can be ensured.

[0088] The width W in the extension direction of the first straight line 71 of the fixed part 44 and the width L in the extension direction of the first straight line 71 of the grounding conductor plate 135 P This means that the following equation (2a) is satisfied, equation (2b) is preferred, and equation (2c) is more preferred. W / L P If the W / L ratio is less than 0.01, the fixing strength between the fixing part 44 and the housing part 20 may be weak and unstable. P If the value exceeds 0.75, the antenna gain of antenna 130 may decrease. 0.01 ≤ W / L P ≤0.75 ···(2a) 0.05 ≤ W / L P ≤0.65 ···(2b) 0.10 ≤ W / L P ≤0.50 ···(2c) The antenna 130 may also include a parasitic conductor plate (not shown). A parasitic conductor plate is a conductor that is not connected to the feed line or grounding line (or the ground potential conductor) of the transmission line. The parasitic conductor plate may be arranged, for example, on the main surface of the dielectric substrate 134 on the side where the radiating plate 132 is located, so as not to overlap with the radiating plate 132. Furthermore, the antenna may have one or two parasitic conductor plates. If two parasitic conductor plates are provided, they may be arranged one on each side of the first straight line 71, in a shape that is symmetrical with respect to the first straight line 71. In particular, the parasitic conductor plate may be arranged in a rectangular shape (for example) that extends in the direction D of the vibration of the vertical polarization Q. If the antenna 130 has a rectangular outer edge, it is easier to obtain good directivity in the horizontal plane angular range (180° angular range) over the LH~FR~RH direction (see Figure 8).

[0089] [Operation of the fourth embodiment] Next, the operation and effects of the antenna device with mounting member and the mounting structure of the antenna device according to the fourth embodiment will be described.

[0090] The antenna device with mounting member of the fourth embodiment can be firmly attached to the vehicle body with high rigidity by setting the width W in the extension direction of the first straight line 71 of the fixing part 44 so as to satisfy equation (2a), and a decrease in antenna gain can be suppressed, thereby ensuring stable directivity.

[0091] The antenna device with mounting member and the antenna device have been described above based on the embodiments described above. However, the specific configuration is not limited to these embodiments, and changes to the design are permitted as long as they do not deviate from the gist of the invention as described in each claim of the patent claims.

[0092] In the above embodiment, an example was described in which the antenna device with mounting member is mounted near the interior side of the windshield 12 of the vehicle 10. Figure 13 is an exploded cross-sectional view including the antenna device 328 with mounting member at BB in Figure 1. As shown in Figure 13, the antenna device 328 with mounting member may also be mounted near the interior side of the rear glass 14. In this case, the extension portion 346 may be formed, for example, extending from the lower end of the fixing portion 44 in the vertical direction of the vehicle toward the front of the vehicle (inside the cabin). The connecting portion 48 may also be formed in a substantially L-shape in a cross-section in the YZ plane. The antenna 328 of the antenna device 328 may also be mounted near the upper part of the windshield 12.

[0093] In the above embodiment, an example was described in which one antenna device with mounting members is attached near the windshield 12 of the vehicle 10. However, one or more antenna devices with mounting members may be attached near the windshield 12 and near the rear window 14 of the vehicle 10, or they may be attached in other locations.

[0094] In the above embodiment, the housing portion 20 is shown to have a protruding portion 25A. However, the housing portion does not have to have a protruding portion. In this case, a mounting portion for attaching the fixing portion 44 to the housing portion 20 may be provided inward from the outer edge of the back surface 24B of the housing portion 20.

[0095] In the above embodiment, an example was shown in which the housing section 20 houses the entire antenna 30. However, the housing section may house at least a part of the antenna.

[0096] In the above embodiment, the mounting member 40 is shown to be formed in a substantially U-shape in a cross-section along the YZ plane, comprising a mounting portion 42, an extension portion 46, and a connecting portion 48. However, the mounting member may also be formed in a crank shape in a cross-section along the YZ plane, comprising a mounting portion, an extension portion, and a connecting portion, or it may have any other shape.

[0097] In the above embodiment, antennas 30 and 130 were shown as antennas that transmit and receive vertically polarized Q in the 5.8 GHz band or 5.9 GHz band, which is used for vehicle-to-vehicle communication and vehicle-to-infrastructure communication, etc. However, the antennas may be antennas that transmit and receive vertically polarized waves in other frequency bands. Also, the antennas may be antennas that transmit and receive horizontally polarized waves (an example of linear polarization).

[0098] In the above embodiment, the mounting member 40 was shown to be made of metal and integrally formed. However, The mounting member only needs to have a metal fixing portion 44. Furthermore, a portion of the mounting member may be formed separately.

[0099] In the above embodiment, an example was shown in which two mounting holes 25B are provided as mounting parts for attaching the fixing part 44 to the housing part 20. However, there may be one or three or more mounting parts for attaching the fixing part 44 to the housing part 20.

[0100] In the above embodiment, an example was shown in which antennas 30 and 130 are V2X antennas. However, various antennas can be used, such as antennas for receiving broadcast waves, antennas for ITS, or 1.2GHz band antennas. The disclosure of Japanese Patent Application No. 2021-202862, filed on 14 December 2021, is incorporated herein by reference in its entirety. [Explanation of symbols]

[0101] 10 vehicles 20 Storage Units 24B Back 25A protrusion 25B Mounting hole (example of mounting part) 28 Antenna equipment 30 Antennas 32 Radiation plate 32A radiation surface 40 Mounting components 44 Fixed part 44B opening 44C axis 46 Stretching section 61 First area 62 Second area 71 First straight line 72 Second straight line D Vibration direction S Screw (an example of a fastening component) Q. Vertical polarization (an example of perpendicular polarization) P1 Center of gravity of the radiating plate P2 Power supply point

Claims

1. An antenna having a radiating plate equipped with a radiating surface that radiates linearly polarized waves in a predetermined frequency band, A housing section that houses at least a part of the aforementioned antenna, Mounting member for attaching the aforementioned housing to the vehicle, The mounting member comprises a metal fixing portion formed in an elongated shape at one end, which abuts against the back surface of the housing portion on the side of the radiation plate opposite to the radiation surface side, thereby fixing the housing portion. When, viewed from the thickness direction of the radiating plate, a first straight line passing through the centroid of the radiating plate and corresponding to the vibration direction of the linear polarization, and a second straight line perpendicular to the first straight line and passing through the centroid, The fixing portion is arranged such that its longitudinal direction is aligned with the extension direction of the second straight line. Viewed from the thickness direction of the radiating plate, the fixing portion is positioned between a first region formed on the back surface on one side in the extension direction of the first straight line and a second region formed on the back surface on the other side in the extension direction of the first straight line. Antenna device with mounting components.

2. When viewed from the thickness direction of the radiation plate, the fixing portion is positioned such that its longitudinal axis coincides with the second straight line. Antenna device with mounting member as described in claim 1.

3. Viewed from the thickness direction of the radiating plate, the feed point of the antenna is located at a position different from the center of gravity and is situated on the first straight line. Antenna device with mounting member as described in claim 1.

4. The antenna includes a grounding conductor plate via a dielectric substrate on the side opposite to the side on which the radiating surface is located relative to the radiating plate. Antenna device with mounting member according to any one of claims 1 to 3.

5. The width W of the first straight line in the extension direction of the fixed portion is equal to the length L of the first straight line in the extension direction of the grounding conductor plate. Ｐ In contrast, 0.01≦W / L Ｐ ≦0.75 It is set to satisfy the relationship. Antenna device with mounting member as described in claim 4.

6. The region where the first region and the grounding conductor plate overlap, and the region where the second region and the grounding conductor plate overlap, have substantially the same shape and substantially the same area. Antenna device with mounting member as described in claim 4.

7. The antenna is a slot antenna having a slot extending along the second straight line. Antenna device with mounting member according to any one of claims 1 to 3.

8. The width W of the first straight line in the extension direction of the fixed portion is equal to the length L of the first straight line of the radiating plate in the extension direction. Ｓ In contrast, 0.01≦W / L Ｓ ≦0.75 It is set to satisfy the relationship. Antenna device with mounting member according to claim 7.

9. The region where the first region and the radiating plate overlap, and the region where the second region and the radiating plate overlap, have substantially the same shape and substantially the same area. Antenna device with mounting member according to claim 7.

10. The housing portion has a projection that protrudes along the second straight line when viewed from the thickness direction of the radiation plate, A mounting portion is formed on the protruding portion, which attaches the fixing portion to the housing portion via a metal fastening member. Antenna device with mounting member according to any one of claims 1 to 3.

11. The fixing portion is symmetrical with respect to the second straight line when viewed from the thickness direction of the radiation plate. Antenna device with mounting member according to any one of claims 1 to 3.

12. The fixing portion has an opening that is open in the thickness direction of the plate, near the center of gravity. A connector is inserted into the aforementioned opening to electrically connect to the feed point of the antenna. Antenna device with mounting member according to any one of claims 1 to 3.

13. The mounting member is formed of metal. Antenna device with mounting member according to any one of claims 1 to 3.

14. The mounting member is integrally formed Antenna device with mounting member according to any one of claims 1 to 3.

15. The mounting member has a metal extension portion that extends away from the radiation plate. Antenna device with mounting member according to any one of claims 1 to 3.

16. The angle between the extended portion and the radiating surface is in the range of 20° to 160°. Antenna device with mounting member according to claim 15.

17. Includes the antenna device with mounting member described in claim 15, When the mounting member of the antenna device with the mounting member is attached to the vehicle, The direction in which the extended portion extends is in the range of -30° to 70° with respect to the horizontal plane. Antenna mounting structure.

18. Includes an antenna device with a mounting member as described in any one of claims 1 to 3, The radiating surface of the antenna of the antenna device with the mounting member is positioned such that, when the mounting member is attached to the vehicle, it is within ±15° of the vertical direction. Antenna mounting structure.

19. The first straight line in the antenna device with mounting member is arranged to be within a range of ±15° with respect to the vertical direction of the vehicle, The aforementioned predetermined frequency band includes the 5.8 GHz band or the 5.9 GHz band. The mounting structure for the antenna device according to claim 17.

20. The antenna of the antenna device with mounting member is a V2X antenna. The mounting structure for the antenna device according to claim 19.

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