Device for improving the behavior of radar wave transmission, external covering component of a vehicle and vehicle

Abstract

The present disclosure relates to a device (32) for improving radar wave (λ) transmission behavior, comprising a wall section, in a first position a first surface and a second surface are positioned relative to each other at a first wall thickness distance, in a second position the first surface and the second surface are positioned relative to each other at a second wall thickness distance, the first wall thickness distance (dw1) and the second wall thickness distance (dw2) differ from each other by a first difference (Δ1); and a balancing body mounted on the first surface of the wall section, in a first position a first body surface and a second surface are positioned relative to each other at a first travel distance, in a second position the first body surface and the second surface are positioned relative to each other at a second travel distance, the first travel distance (de1) and the second travel distance (de2) differ from each other by a second difference (Δ2), the second difference (Δ2) is smaller than the first difference (Δ1). The present disclosure also relates to an exterior cladding component of a vehicle and a vehicle comprising the exterior cladding component.

Description

Technical Field

[0001] This disclosure relates to an apparatus for improving radar wave transmission behavior, and to an external covering component of a vehicle including such an apparatus. Furthermore, this disclosure relates to a vehicle incorporating such an external covering component. Background Technology

[0002] To enhance operational safety, modern vehicles are equipped with numerous driver assistance systems (HAS) to aid the driver. Many HAS systems rely on monitoring the vehicle's surroundings and interacting with corresponding sensors. Based on the identified conditions in the environment, the HAS can take action. This action could be generating signals, such as optical or acoustic signals, to attract the driver's attention to a specific situation. This could be identifying an object in the surrounding environment that, without any resistant action, could collide with the vehicle. Another action could be the HAS initiating braking and / or steering intervention for evasive maneuvers. Monitoring the vehicle's surroundings is a critical issue in autonomous driving.

[0003] To monitor the surrounding environment, sensors can include sources of electromagnetic waves that emit into the environment. If an object is present in the environment, the electromagnetic waves are reflected and detected by a corresponding receiver. Therefore, the conditions around a vehicle can be characterized. The degree to which an object reflects electromagnetic waves depends primarily on the material the object is made of. Other factors include the size of the object and its effective reflective surface. Therefore, vehicles are equipped with sensors that use electromagnetic waves of different wavelengths and frequency ranges. One important type of electromagnetic wave is the radar wave. A corresponding radar sensor includes a radar source for generating and emitting radar waves and a receiver for receiving the reflected radar waves.

[0004] Due to design considerations, sensors are typically located behind the external enclosure, making them invisible or nearly invisible from the outside. Therefore, electromagnetic waves emitted by the corresponding source must pass through or penetrate the vehicle's external enclosure to reach the outside. In many cases, the external enclosure is made of plastic, particularly thermoplastics that can suppress electromagnetic waves to some extent. The more waves are suppressed, the smaller the detection range the sensor can monitor for the environment around the vehicle. The degree of electromagnetic wave suppression depends on several factors, some of which are the wall thickness and travel distance of the external enclosure. Other factors are the materials used to make the external enclosure and the characteristics of the paint or coating applied to it, and especially to the finished surface.

[0005] Methods for reducing electromagnetic wave attenuation are disclosed in DE 100 53 517A1, DE 198 19 709A1, DE 10 2018 211 786 A1, DE 102 59246A1, WO 2006 / 042725 A1 and WO 2007 / 045452 A2.

[0006] In almost all cases, external coverings made of plastic are manufactured by injection molding. Most external coverings are typically formed from a substrate that forms wall sections. These wall sections include a first surface and a second surface. Hereinafter, the second surface is the surface visible from the outside. The first surfaces are positioned relative to each other at a distance commonly referred to as the wall thickness.

[0007] To ensure that the liquid plastic injected into the mold can reach an area considerably farther from the injection point on the substrate, the wall thickness decreases with increasing distance from the injection point. As mentioned above, the attenuation of radar waves when penetrating the outer covering depends on the wall thickness. The radar sensor emits radar waves within a region that is approximately cone-shaped. Due to the variation in wall thickness, the attenuation of radar waves within the cone differs, resulting in poor performance for a given radar sensor, primarily in terms of detection range and resolution accuracy. Summary of the Invention

[0008] One objective of one embodiment of this disclosure is to provide an apparatus for improving radar wave transmission behavior, by which the aforementioned defects can be eliminated or at least reduced, and the performance of radar sensors can be improved.

[0009] According to embodiments of this disclosure, an apparatus for improving radar wave transmission behavior includes:

[0010] - A wall section having a first surface and a second surface, wherein

[0011] In the first position, the first surface and the second surface are positioned relative to each other by a first wall thickness distance, and

[0012] In the second position, the first surface and the second surface are positioned relative to each other by a distance equal to the second wall thickness.

[0013] The first wall thickness distance and the second wall thickness distance differ from each other by a first difference value, and

[0014] - A balancing body, mounted on a first surface of a wall segment, the balancing body having a first body surface and a second body surface, and mounted on the first surface of the wall segment via the second body surface.

[0015] - Radar waves emitted by the radar sensor when it is fastened to the mounting section strike the surface of the first body.

[0016] Entering the equilibrium body and subsequently entering the wall section, and

[0017] Leaving the wall section via the second surface,

[0018] - In the first position, the first body surface and the second surface are positioned relative to each other by a first travel distance.

[0019] - In the second position, the first body surface and the second surface are positioned relative to each other by a second travel distance.

[0020] - The first travel distance and the second travel distance differ from each other by a second difference value.

[0021] - The equalizer is designed and installed into the wall section such that the second difference is smaller than the first difference.

[0022] Typically, the wall thickness distance between the first and second positions will not exceed the first wall thickness distance or be less than the second wall thickness distance.

[0023] Radar waves emitted by a radar sensor strike the surface of a first body, penetrate the equalizer and wall sections, and enter the surrounding environment, such as that of a vehicle, via a second surface. Through the equalizer, a second difference decreases compared to a first difference. Therefore, the travel distance of the radar waves through the equalizer and wall sections is optimized, and thus the attenuation of the radar waves within the cone is optimized, resulting in improved radar sensor performance.

[0024] Another embodiment may feature that the second difference is zero. In this case, the travel distance of the radar wave through the equalizer and wall segments is extensively optimized, resulting in high performance of the radar sensor.

[0025] In an alternative embodiment, the first body surface is planar in at least some sections. As previously mentioned, the cladding components of a vehicle are typically significantly curved, which can also lead to variations in radar wave attenuation. It has been found that radar wave transmission and reflection behavior is improved when the first body surface is planar.

[0026] According to another embodiment, the balancing body is secured to the wall segment by gluing, welding, or molding. These methods of securing the balancing body to the wall segment can be performed quickly and can be automated.

[0027] According to another embodiment, the wall section is made of a first plastic, and the equalizer is made of a second plastic, wherein the first and second plastics are the same plastic or different from each other. There are no notable limitations in selecting the plastic for the equalizer. The first plastic can be selected considering its attenuation effect on radar waves. However, from a manufacturing perspective, it can be advantageous for the first and second plastics to be the same, which facilitates a fastening process via welding.

[0028] According to another embodiment, the first and second travel distances are selected such that the attenuation of the radar wave reaches or approaches a minimum. It is worth noting that the attenuation of the radar wave through a given body does not increase linearly with the travel distance. The attenuation generally follows a sinusoidal curve beyond the travel distance. Therefore, the shape of the equalizing body can be chosen such that increasing the travel distance reduces the attenuation. Thus, the performance of the radar sensor can be improved.

[0029] In another embodiment, the device includes a mounting section for mounting a radar sensor, the mounting section being secured to an equalizer or wall section. The mounting section is required for mounting the radar sensor. In this embodiment, the device manufacturer may also provide it along with the mounting section, and the radar sensor may be secured to the mounting section shortly after the device is completed and before it is secured to the vehicle. The manufacturing process remains simple.

[0030] Another embodiment may feature that the mounting section and the balancing body are integrally formed, or the mounting section and the wall section are integrally formed. The device according to this embodiment can be injection molded, allowing for the rapid and cost-effective manufacture of a large number of devices. There is no need to connect the mounting section and the balancing body, or the mounting section and the wall section, to each other, which saves manufacturing steps and ensures precise positioning of the mounting section and the balancing body.

[0031] According to another embodiment, the mounting section may include an absorbing layer or an absorbing material, wherein the absorbing layer or material absorbs radar waves when they strike the mounting section. Depending on the opening angle and the location of the mounting section, it may be impossible to avoid some radar waves striking the mounting section. The surface of the mounting section may reflect radar waves that can reach the radar detector without being reflected by objects in the vehicle's surrounding environment. Furthermore, some radar waves may be reflected on a first surface. Combined with radar waves striking the mounting section, multiple reflections can occur, causing interference signals that can lead to misunderstandings. In this embodiment, radar waves striking the mounting section are absorbed, thereby avoiding interference signals. This improves the detection quality of objects in the vehicle's surrounding environment.

[0032] Another embodiment of this disclosure relates to an external covering component for a vehicle, including

[0033] -Matrix, and

[0034] - In the apparatus of one of the foregoing embodiments, the wall section forms part of the substrate.

[0035] The technical effects and advantages discussed regarding this device also apply to the external enclosure component. In short, within the conical region, the transmission behavior of radar waves striking the substrate and penetrating the external enclosure component is improved, thereby resulting in better performance of the radar sensor mounted in the mounting section.

[0036] The device can be fastened to the substrate of the covered component, for example, by welding or gluing. However, the device can also be integrated into the covered component, thus eliminating the need for fastening.

[0037] Another embodiment may feature that the wall segments and the substrate are formed of the same first plastic. Although the substrate and wall segments can be made of different plastics, it can be advantageous to use the same first plastic for both. They can then be manufactured as a single piece. Furthermore, if they are made as separate parts, they can be fastened together by welding.

[0038] As previously mentioned, the device can be manufactured by injection molding. The same applies to the substrate covering the components. However, the substrate does not necessarily have to be made of the same plastic as the mounting section and wall section. The substrate may need to meet different requirements than those required by the mounting section and wall section. The first and second plastics can be selected to satisfy each requirement.

[0039] In another embodiment, the second surface may be part of the outer surface of the covering component. In this embodiment, the device may be implemented as a baffle, bumper support, grille, etc., making the second surface of the device visible from the outside. In particular, when the covering component is implemented as a bumper, the latter typically includes multiple baffles or grilles. In this embodiment, the device also performs the function of baffles, grilles, etc., thereby keeping the number of components low.

[0040] According to another embodiment, the radar sensor can be securely mounted to the mounting section. In this embodiment, objects in the environment surrounding the vehicle can be detected and corresponding signals generated. These signals can be used to assist the driver and / or for autonomous driving.

[0041] Another embodiment relates to a vehicle that includes an external covering component or device according to one of the prior embodiments. The technical effects and advantages discussed with respect to the external covering component of the present invention also apply to vehicles. In short, the transmission behavior of radar waves incident on the substrate and penetrating the external covering component is optimized within the conical region, thereby resulting in better performance of the radar sensor mounted to the mounting section. Attached Figure Description

[0042] This disclosure is described in detail with reference to the accompanying drawings, in which

[0043] Figure 1This is a schematic cross-sectional view of the wall section of the external covering component of a vehicle, based on existing technology.

[0044] Figure 2 This is a schematic cross-sectional view of a wall section of a first embodiment of the external covering component of a vehicle including a balance body.

[0045] Figure 3 Showing Figure 2 The first embodiment of the external covering component shown includes a radar sensor that emits radar waves that penetrate the equalizer and the wall section.

[0046] Figure 4 A second embodiment of the external covering component is shown, wherein the mounting section is connected to the equalizer.

[0047] Figure 5 A third embodiment of the external covering component is shown, wherein, as in the second embodiment, the mounting section is connected to the equalizer.

[0048] Figure 6 It shows that at least one of them is based on Figures 2 to 5 The external covering component of the device in one of the illustrated embodiments, and

[0049] Figure 7 A schematic top view of a vehicle including multiple external covering components of this disclosure is shown. Detailed Implementation

[0050] exist Figure 1 The diagram illustrates, by way of a schematic sketch, the wall section 10, and in particular the external covering component 12 of the vehicle 14 according to the prior art. The wall section 10 may be part of the base 16 of the external covering component 12 (see schematic sketch). Figure 6 The wall section 10 includes a first surface 18 and a second surface 20. The first surface 18 faces the interior of the vehicle 14, while the second surface 20 faces the surrounding environment of the vehicle 14.

[0051] At the first position 22, the first surface 18 and the second surface 20 are positioned relative to each other by a first wall thickness distance dw1. At the second position 24, the first surface 18 and the second surface 20 are positioned relative to each other by a second wall thickness distance dw2. In other words, the wall segment 10 has a first wall thickness at the first position 22 and a second wall thickness at the second position 24. The first wall thickness distance dw1 and the second wall thickness distance dw2 differ from each other by a first difference value Δ1, which means that the first wall thickness and the second wall thickness are not equal. Figure 1 It can be seen that the first wall thickness distance dw1 is greater than the second wall thickness distance dw2. From Figure 1From left to right, the wall thickness of wall segment 10 continuously decreases. Between the first position 22 and the second position 24, the wall thickness distance will not exceed the first wall thickness distance dw1 or be lower than the second wall thickness distance dw2.

[0052] The first difference Δ1 can also be expressed by the following equation:

[0053] Δ1=|dw1-dw2|

[0054] Radar sensor 26 generates radar wave λ, which is emitted within a cone-shaped region 30 with a given opening angle θ. The radar wave λ emitted by radar sensor 26 first strikes the first surface 18, penetrates the wall section 10, and then enters the surrounding environment via the second surface 20. Radar sensor 26 is mounted on... Figure 1 Installation section 28 not shown in the image (see...) Figure 4 Installation section 28 can be formed by the chassis (not shown) of vehicle 14.

[0055] When radar wave λ penetrates the wall section 10, the radar wave is attenuated by the material of the wall section 10. Furthermore, the external cladding component 12 of the vehicle 14 is typically curved, which is also... Figure 1 The situation is illustrated in wall segment 10, although the corresponding curvature is not particularly pronounced. Due to the curvature, each radar wave λ strikes the first surface 18 at a different angle of incidence. Varying wall thickness and curvature negatively impact the transmission behavior of radar waves λ through the outer covering component 12, resulting in poorer performance of the radar sensor 26.

[0056] Figure 2 This illustration shows a first embodiment of the device 321 of the present invention for improving the transmission behavior of radar wave λ emitted by radar sensor 26. The wall section 10 of the device 321 and... Figure 1 The illustrated device is equivalent. The equalizer 34 is fastened to the wall section 10. The equalizer 34 includes a first body surface 36 and a second body surface 38. The first body surface 36 faces the radar sensor 26, while the second body surface 38 contacts the first surface 18 of the wall section 10. The equalizer 34 can be fastened to the wall section 10, for example, by gluing, welding, or molding. However, other fastening methods are conceivable.

[0057] At the first position 22, the first body surface 36 and the second surface 20 are positioned relative to each other by a first travel distance de1. At the second position 24, the first body surface 36 and the second surface 20 are positioned relative to each other by a second travel distance de2. The first travel distance de1 and the second travel distance de2 can also be considered as the sum of the corresponding wall thicknesses of the wall segment 10 and the equalizer 34. The first travel distance de1 and the second travel distance de2 differ from each other by a second difference value Δ2.

[0058] The second difference Δ2 can also be expressed by the following equation:

[0059] Δ2=|de1-de2|

[0060] The equalizer 34 is designed such that the second difference Δ2 is less than the first difference Δ1. The radar wave λ emitted by the radar sensor 26 first strikes the first body surface 36, penetrates the equalizer 34, and then penetrates the wall section 10. The radar wave then enters the surrounding environment, particularly the vehicle 14, via the second surface 20. Because the second difference Δ2 is less than the first difference Δ1, the distance the radar wave λ travels through the equalizer 34 and the wall section 10 is different from the distance the radar wave travels only through the wall section 10 (e.g., ...). Figure 1 (As shown) the difference is significantly smaller. Through the equalizer 34, the transmission behavior of the radar wave λ, and therefore the performance of the radar sensor 26, is improved.

[0061] As previously mentioned, the attenuation of radar wave λ roughly follows a sine curve as a function of travel distance (in this case, specifically the first travel distance de1 and the second travel distance de2). The equalizer 34 can be designed to not only minimize the second difference Δ2, but also increase the first travel distance de1 and the second travel distance de2, such that the attenuation of radar wave λ is equal to or close to the minimum of the sine curve. Since the slope of the sine curve is small in the minimum (or maximum) region, the difference in travel distance has a relatively small impact on the attenuation of radar wave λ. In this case, variations in the first wall thickness dw1 and the second wall thickness dw2, which may be caused by manufacturing errors, as well as variations in the dimensions of the equalizer 34, are acceptable.

[0062] exist Figure 3 The device 321 shown has a first radar sensor 261 and a second radar sensor 262 respectively mounted on a first mounting section 281 and a second mounting section 282. The first radar sensor 261, the first mounting section 281, and the second radar sensor 262 are shown in a very simplified manner. The first radar sensor 261 and the first mounting section 281 are indicated by solid lines, while the second radar sensor 262 and the second mounting section 282 are indicated by dashed lines. Which radar sensor 26 is used can depend on the configuration of the vehicle 14. The first radar sensor 261 can be used in a low-cost configuration of the vehicle 14, while the second radar sensor 262 can be used in a configuration suitable for autonomous driving.

[0063] The first radar sensor 261 and the second radar sensor 262 differ in size. The first mounting section 281 and the second mounting section 282 differ not only in size but also in their position relative to the device 321. Therefore, the locations of the regions through which the radar waves λ emitted by the first radar sensor 261 and the second radar sensor 262 pass are different relative to the device 321. Regardless of these differences, as long as the radar waves λ emitted by the first radar sensor 261 and the second radar sensor 262 strike the equalizer 34, the device 321 produces improved transmission behavior. Therefore, the device 321 is quite insensitive to these differences and is thus generally applicable.

[0064] This insensitivity is beneficial not only in the case of two radar sensors 261, 262, but also in the case of only one radar sensor 26. There is no need to fasten the radar sensor 26 to the mounting section 28 with high precision, which facilitates and accelerates fastening. Furthermore, the position of the radar sensor 26 relative to the device 321 can be changed during vehicle operation. Changes in position have no significant impact on transmission behavior and therefore on the performance of the radar sensor 26.

[0065] Figure 4 A second embodiment of the device 322 of the present invention is shown. The mounting section 28 for mounting the radar sensor 26 is fastened to the equalizer 34. The wall section 10 and the equalizer 34 can be constructed in the same manner as in the first embodiment of the device 321. The wall section 10 is made of a first plastic 40, and the equalizer 34 is made of a second plastic 42. The first plastic 40 may be different from the second plastic 42. However, it may be advantageous for the first plastic 40 and the second plastic 42 to be the same, particularly since the equalizer 34 is fastened to the wall section 10 by welding.

[0066] Mounting section 28 can be made of the same first plastic 40 as the equalizer 34, which also facilitates fastening mounting section 28 to the equalizer 34 as described above. However, mounting section 28 can also be fastened to wall section 10. In this case, it can be advantageous to manufacture mounting section 28 using the same second plastic 42 as the wall section 10. However, it is also possible to use three different plastics for mounting section 28, equalizer 34, and wall section 10.

[0067] Figure 5 A third embodiment of the device 323 of the present invention is shown. In this case, the mounting section 28 and the equalizer 34 are made as a single piece. Furthermore, the first surface 18 is planar, and the second difference Δ2 is zero.

[0068] from Figure 5 It can be seen that at least a portion of the radar wave λ incident on the surface 36 of the first body is reflected. The reflected radar wave λ is represented by λ. x Represents the reflected radar wave λ.x The reflected radar wave λ hits the mounting section 28, returns from the mounting section 28 to the first body surface 36, and then from the first surface 18 to the radar sensor 26. x This can cause interference signals in radar sensor 26. To avoid such interference signals, mounting section 28 includes radar wave λ. x Absorption layer 44 (see) Figure 5 (The left side of the installation section 28). Radar wave λ incident on the absorbing layer 44. x Absorbed. The radar wave λ is shown by the dashed line. x It is canceled out, so no interference signal can be generated.

[0069] It is worth mentioning that, Figure 5 In the diagram, the radar wave λ is shown. x This is only for explaining the generation of interference signals. During the operation of device 323, multiple reflected radar waves λ are expected. x .

[0070] Instead of absorbent layer 44, absorbent material 46 can also be used added to the plastic forming the mounting section 28 (see...). Figure 5 (Right side of installation section 28). Radar wave λ incident on installation section 28 containing absorbing material 46. x To avoid interference signals (not shown), the signal is not reflected. The result is the same as when using absorption layer 44.

[0071] Figure 6 The exterior cladding 12 of vehicle 14 is shown, in this case, the front bumper 48. The front bumper 48 includes two baffles 50, indicated by shaded areas. Each baffle 50 may be constructed according to either the first or second embodiment (…). Figure 6 Devices 321 and 322 (not shown) are formed. In this case, the second surface 20 of devices 321 and 322 forms part of the outer surface 52 of the covering member 12.

[0072] A brand logo 54 of a given vehicle manufacturer is located at the upper center of the front bumper 48. The brand logo 54 may be formed by devices 321-323 according to one of the embodiments described above. This is also applicable to the grille 56 integrated into the front bumper 48.

[0073] For example, according to the third embodiment, multiple devices 323 can be fastened to the front bumper 48 at any desired location.

[0074] It should be noted that the front bumper 48 does not necessarily include the baffle 50. Devices 321 to 323 may also be mounted on coated bumper skin.

[0075] Figure 7A top view of vehicle 14 is shown, which is equipped with a plurality of external covering components 12, to which one or more devices 32 according to one of the above embodiments can be fastened. Figure 6 As shown, the first external covering component 121 is implemented as the front bumper 48. Furthermore, two second external covering components 122 are implemented as coverings for the B-pillars 58. The third external covering component 123 is implemented as the rear bumper 60. If an object is located within the cone-shaped area 30, the radar sensor 26 of the device 32 can observe the object 62 in the surrounding environment of the vehicle 14.

[0076] List of reference numerals

[0077] 10 Wall Section

[0078] 12 Covering components

[0079] 121-123 Covered components

[0080] 14 vehicles

[0081] 16 Matrix

[0082] 18 First Surface

[0083] 20 Second Surface

[0084] 22 First position

[0085] 24 Second position

[0086] 26 Radar Sensors

[0087] Radar sensors 261 and 262

[0088] 28 Installation Sections

[0089] Installation sections 281 and 282

[0090] 30 cone-shaped regions

[0091] 32 devices

[0092] Devices 321-323

[0093] 34 Equilibrium

[0094] 36 First body surface

[0095] 38 Second Body Surface

[0096] 40 First Plastic

[0097] 42 Second Plastic

[0098] 44 Absorption Layer

[0099] 46 Absorbent Materials

[0100] 48 Front bumper

[0101] 50 baffles

[0102] 52 Outer surface

[0103] 54 Brand Logos

[0104] 56 grilles

[0105] 58 B-pillar

[0106] 60 rear bumper

[0107] 62 objects

[0108] dw1 First wall thickness distance

[0109] dw2 Second wall thickness distance

[0110] de1 First travel distance

[0111] de2 Second travel distance

[0112] Δ1 First difference

[0113] Δ2 Second difference

[0114] λ radar wave

[0115] λ x Reflected radar waves

[0116] θ Opening angle

Claims

1. A device (32) disposed on a wall section (10) of an external covering component (12) of a vehicle (14), wherein, The device is suitable for improving the transmission behavior of radar waves (λ), and the device includes: An equalizer (34) is mounted on a wall section (10), the equalizer having a first body surface (36) and a second body surface (38) and mounted on the wall section (10) via the second body surface (38), wherein the wall section (10) has a first surface (18) and a second surface (20), at a first position (22), the first surface (18) and the second surface (20) are positioned relative to each other by a first wall thickness distance (dw1), and at a second position (24), the first surface (18) and the second surface (20) are positioned relative to each other by a second wall thickness distance (dw2), the first wall thickness distance (dw1) and the second wall thickness distance (dw2) differing from each other by a first difference (Δ1), wherein the wall section (10) is formed by injection molding, and the wall thickness of the wall section (10) decreases with increasing distance from the injection point and decreases continuously on the wall section (10), and A radar sensor (26), which is fastened to the mounting section (28), emits a radar wave (λ), which strikes the first body surface (36), enters the equalizer (34) and then enters the wall section (10), and exits the wall section (10) via the second surface (20). In the first position (22), the first body surface (36) and the second surface (20) are positioned relative to each other by a first travel distance (de1). In the second position (24), the first body surface (36) and the second surface (20) are positioned relative to each other by a second travel distance (de2). The first travel distance (de1) and the second travel distance (de2) differ from each other by a second difference value (Δ2). The equalizer (34) is mounted on the first surface (18) of the wall section (10) and is adapted to make the second difference (Δ2) smaller than the first difference (Δ1).

2. The device (32) according to claim 1, characterized in that, The second difference (Δ2) is zero.

3. The apparatus (32) according to claim 1 or 2, characterized in that, The first body surface (36) is planar in at least some sections.

4. The apparatus (32) according to claim 1 or 2, characterized in that, The equalizer (34) is fastened to the wall section (10) by gluing, welding or molding.

5. The apparatus (32) according to claim 1 or 2, characterized in that, The wall section (10) is made of a first plastic (40), and the balance body (34) is made of a second plastic (42). The first plastic (40) and the second plastic (42) are the same plastic or different from each other.

6. The apparatus (32) according to claim 1 or 2, characterized in that, The first travel distance (de1) and the second travel distance (de2) are selected to minimize or near the attenuation of the radar wave (λ).

7. The apparatus (32) according to claim 1 or 2, characterized in that, The device (32) includes the mounting section (28) for mounting the radar sensor (26), the mounting section (28) being fastened to the equalizer (34) or the wall section (10).

8. The apparatus (32) according to claim 7, characterized in that, - The installation section (28) and the equalizer (34) are made into a single piece, or - The installation section (28) and the wall section (10) are made into a single piece.

9. The apparatus (32) according to claim 1 or 2, characterized in that, The installation section (28) includes an absorbing layer (44) or an absorbing material (46) that absorbs radar waves (λ) when they strike the installation section (28).

10. An external covering component (12) for a vehicle (14), comprising: -Matrix (16), and - In the device (32) according to any one of claims 1 to 9, the wall section (10) forms part of the substrate (16).

11. The external covering component (12) according to claim 10, characterized in that, The wall section (10) and the substrate (16) are formed of the same first plastic (40).

12. The external covering component (12) according to claim 10 or 11, characterized in that, The second surface (20) is part of the outer surface (52) of the outer covering component (12).

13. A vehicle (14) comprising an external covering (12) according to any one of claims 10 to 12 or a device (32) according to any one of claims 1 to 9.

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