Attachment arrangement for an antenna device for a vehicle

Abstract

An antenna device for a vehicle comprises a substrate (1), an expansion element and an actuating element cooperating with the substrate (1) and the expansion element, the expansion element being formed by a first expansion element part (10) and at least one further expansion element part (11) cooperating with the first expansion element part (10), the first expansion element part (10) having at least one flat area (12, 14), and the at least one further expansion element part (11) also having at least one flat area (13, 15), a side arm (16) protruding at an angle from the flat area (14) of the first expansion element part (10), and a side arm (17) protruding from the flat area (15) of the at least one further expansion element part (11), a laterally open notch (19) being provided in each flat area (12, 14; 13, 15) for cooperating the first expansion element part (10) with the at least one further expansion element part (11) and for forming a single passage opening for the actuating element.

Description

Technical Field

[0001] The invention relates to an antenna device for a vehicle, wherein, according to the features of the preamble of claim 1 , the antenna device has a base plate, an expansion element and an actuation element cooperating with the base plate and the expansion element. Background Art

[0002] An antenna device for a vehicle is known from US 2011 / 0267243 A1. The antenna device is placed on the upper side of a vehicle body surface, in particular a vehicle roof, wherein the bottom side of a substrate of the antenna device rests on the upper side of the vehicle body surface. The area of ​​the substrate can be accessed from the bottom side of the vehicle body surface because the vehicle body surface has a corresponding cutout. From the bottom side of the vehicle body surface, an expansion element is operably connected to the substrate, wherein the expansion element is actuated and expanded by an actuating element, as a result of which the antenna device is permanently but releasably arranged and fixed on the upper side of the vehicle body surface by means of the expansion effect. In this prior art, there are two expansion elements cooperating with a sleeve, a clamping element and an actuating element. Both expansion elements are formed as independently acting elements and are arranged in a cross shape, wherein the cross shape is determined by the clamping elements that are also formed in a cross shape. Each individual expansion element is effective individually, which means that in this prior art, even only one individual expansion element is sufficient to permanently arrange and fix the roof antenna. The expansion element is designed flat in its central area and has a completely closed opening through which the actuating element can be guided. Several angled areas protrude from the central flat area of ​​the respective expansion element, which achieve a spring effect and are necessary during the passage of the preassembled roof antenna through the cutout in the vehicle body surface. After the two expansion elements have been arranged in a cross shape on the bottom side with the aid of sleeves and clamping elements, they are first held by the actuating elements (screws). This can be seen in the printed publication of this American publication. Figure 4 In this state, the roof antenna prepared in this way is placed from above onto the upper side of the body surface and the prepared attachment device is passed through the cutout in the body surface so that it is accessible from the bottom side of the body surface. When the attachment device passes through the cutout in the body surface, the protruding side arms of the two expansion elements are angled in their axial extension and are pressed together and moved back to their starting position again when the bottom side of the base plate has come to rest on the upper side of the body surface. In the above-mentioned American printed publication Figure 5-7. After this backward movement, the front end of the angled area of ​​the side arm abuts against the bottom side of the body surface next to the recess (also called cutout), so that a supporting effect is produced if the actuating element is further actuated. By this further actuation, as shown in Figure 8 of the American printed publication, the bottom side of the base plate is further pulled in the direction of the upper side of the body surface and is thus permanently fixed. The two expansion elements manufactured separately from each other have extremely complex geometries in both the longitudinal and transverse directions, mainly due to their multiple angled areas, and are therefore difficult to manufacture. In addition, the entire attachment device includes not only the two expansion elements, but also a sleeve and a clamping element, so that the two expansion elements do not work without a clamping element or a sleeve. Therefore, if the clamping element or the sleeve is forgotten during installation, the two expansion elements will not work. The two known expansion elements fit together in the axial direction of the actuating element to form a cross. In addition, the channel opening for the actuating element is closed in the circumferential direction.

[0003] Similar attachment arrangements for arranging and attaching an antenna device, in particular a roof antenna, on a body surface of a vehicle, in particular a roof, are known from US 2013 / 0082158 A1 and US 2018 / 0026328 A1. Summary of the invention

[0004] The invention is based on the problem of providing an antenna arrangement for a vehicle which is cheaper than the prior art and which provides improved installation.

[0005] This problem is solved by the features of claim 1 .

[0006] According to the invention, it is envisaged that the expansion element is formed by a first expansion element part and at least one further expansion element part cooperating with the first expansion element part, wherein the first expansion element part has at least one flat area and the at least one further expansion element part also has at least one flat area, wherein a side arm protrudes at an angle from the flat area of ​​the first expansion element part and a side arm protrudes from the flat area of ​​the at least one further expansion element part, wherein a laterally open notch is provided in each flat area for the first expansion element part to cooperate with the at least one further expansion element part and form a single passage opening for the actuating element. This configuration firstly has the advantage that only a single expansion element consisting of two separate parts is required in order to arrange and permanently fix the antenna device on the vehicle body surface. For this purpose, two expansion element parts are provided, which do not act in isolation, but achieve the required function when they cooperate. On the one hand, the two cooperating expansion element parts form a circumferentially closed passage opening for the actuating element, wherein they are laterally open in their flat areas in the uncooperated state in order to enable cooperation, which occurs transversely to the axial orientation of the actuating element. Furthermore, the side arms can be constructed significantly simpler, since it is not necessary to use these to achieve a spring effect. Thus, the side arms extend at an angle from the flat area of ​​the corresponding expansion element part in the direction of the base plate of the antenna device, so that the attachment device of the antenna device can be supported on the bottom side of the body surface by the front end of the side wall after being placed on the body surface of the vehicle. Advantageously, exactly two expansion element parts form a single expansion element of the attachment device. It is also conceivable to use more than two expansion element parts, which are then arranged in a triangle, a cross or the like and form a single expansion element of the attachment device.

[0007] The two expansion parts do not necessarily have to be open laterally. Alternatively, they can also have a notch at the front or back, i.e. they can be open. The above-mentioned matching of the individual parts is also not necessary: ​​alternatively, the two parts can be superimposed on each other and fixed only by screws.

[0008] In a further development of the invention, it is provided that the first expansion element part and the at least one further expansion element part are prestressed by means of a spring element at the base plate. By means of this prestressing of the spring element, it is advantageously achieved that after the side arms of the at least two expansion elements have been fixed to the base plate by means of the actuating element (before the antenna device is mounted on the body surface), the side arms of the at least two expansion elements can be passed through the recess in the body surface. This passage takes place either without contacting the side edge of the recess or preferably by contacting the side edge of the recess, as a result of which the side arms of the two expansion element parts are moved to a certain extent in the direction of the center axis of the attachment device. This means that they are pressed together to a certain extent during the passage. This has the advantage that when the bottom side of the base plate is placed on the upper side of the body surface, the two side arms are moved back to their initial position again (due to the prestressing by means of the spring element), so that the ends of the two side arms rest on the bottom side of the body surface. This ensures that the antenna device is arranged in the first position (also called pre-installation position) on the body surface. The arrangement is either already final (in particular by using further elastic means such as seals, etc., since otherwise a sealing effect cannot be achieved if desired), so that further orientation of the placed antenna device can be dispensed with, or the antenna device can still be oriented in its final position after placement. This depends on how the substrate and recess of the antenna device and the attachment device are configured. In this respect, this will be explored in the further description of the drawings. Thus, the pressing apart of the two side arms is advantageously carried out due to the prestressing achieved with the aid of spring elements, but the pressing apart can also be carried out solely by means of an actuating element in addition to the spring elements. Where applicable, it is necessary to add further elements (guides, sliding links or the like).

[0009] In a particularly preferred configuration, the spring element is formed as a helical spring to generate the prestress. This has the advantage that a conventional spring element is used through which the actuating element (eg a screw) can be fed.

[0010] In another improvement of the present invention, it is envisaged that each expansion element part has two flat areas, wherein the two flat areas of each expansion element part are oriented offset from each other on a plane. As a result, the two expansion element parts are matched due to their corresponding lateral open gaps and pivot after matching, so that the flat areas of the corresponding expansion element parts, which are oriented to each other at a specific angle before pivoting, are placed on each other almost parallel to each other. As a result, the two expansion element parts form a double layer around the passage opening for the actuating element, so that the resulting area is strengthened around the entire periphery of the passage opening or at least the individual flat areas of the two expansion element parts can be formed thinner in terms of material. Without matching the two expansion element parts and then pivoting them, there is no functional expansion element that can be used for the attachment device of the antenna device. In addition, since no clear passage opening is formed for the actuating element, installation has not been possible before.

[0011] In a further development of the invention, it is envisaged that the angled edge region is present at least partially around the flat region. As a result, the respective angled flat region of each expansion element part causes the facing respective flat region of the other expansion element part to be guided together in a targeted manner after mating and pivoting, so as to form a double layer around the passage opening for the actuating element. The two expansion element parts are guided together in a targeted manner by the edge region, thereby providing greater stability for the mating expansion elements and simplifying installation.

[0012] In another development of the invention, it is envisaged that the side arm has at least one angled region oriented in the longitudinal direction of the side arm, which ends at a distance from the front end of the side arm and / or has an arc shape at the front end in its axial extension. After the base plate with its attachment device is arranged on the upper side of the body surface, the first variant advantageously allows the end of the angled region to rest on the bottom side of the body surface, while the other, i.e. stepped end region of the side arm reaches into a recess in the body surface, in particular rests on the side edge of the recess. As a result, after the antenna device is arranged and precisely fixed on the body surface, the corresponding side arm is guided in a targeted manner. The second variant advantageously allows the side arms, which are particularly prestressed, to be pressed together more easily when being fed through the recess in the body surface and to be reliably moved back to their starting position again when the base plate of the antenna device has been placed on the upper side of the body surface. As a result, the installation of the antenna device is facilitated.

[0013] In a further development of the invention, the side arms of the respective expansion element part have two parallel angled areas. As a result, after the attachment process, the overall strength of the attachment device, with which the antenna device is arranged and permanently and releasably fixed on the vehicle body surface, is greatly increased due to the uniform distribution of forces.

[0014] In a further development of the invention, it is envisaged that at least two expansion element parts are formed from a plastic material or a metal substance. If plastic is used, the expansion element parts can be manufactured cheaply, accurately and in large quantities by a plastic injection molding method. This is particularly suitable if the expansion element parts do not have to assume any electrical functions. However, if, for example, a ground connection of the antenna device to other electrical units in the vehicle is required, for example via a conductive body surface, the expansion element parts are formed from a metal substance. In this case, for example, production can be carried out using a known stamping and bending method, in which the desired geometry of the corresponding expansion element parts is formed from a flat metal material. In order to form a single expansion element from two (or, if necessary, more than two) expansion element parts, expansion element parts made of the same material are used (i.e., only made of plastic material or only made of metal substance). However, it is also conceivable, for example, to cooperate an expansion element part made of plastic with an expansion element part made of metal substance to form a single expansion element.

[0015] In a further development of the invention, it is envisaged that at least two expansion element parts are constructed as identical parts (made of plastic material or made of a metal substance). This simplifies the manufacture of the expansion element parts, reduces the variety of parts, and increases the ease of installation, since the necessity of mating two different parts is effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Exemplary embodiments of an antenna device according to the invention with an associated attachment device and a suitable attachment method are described below and explained in more detail by means of the drawings.

[0017] Figure 1 A base plate 1 is shown which is provided with projections on its underside.

[0018] Figure 2 The final orientation of the two expansion element parts 10, 11 for forming a single expansion element is shown.

[0019] Figure 3 The pre-installed position of the attachment device of the antenna device is shown.

[0020] Figure 4 The movement of the antenna device during feeding of its attachment means through the recess 23 is shown.

[0021] Figure 5 The final mounting position of the antenna assembly when permanently deployed and secured to the vehicle roof 22 is shown. DETAILED DESCRIPTION

[0022] The basic elements of the antenna device and the attachment device such as Figure 1For the sake of simplicity, elements required for the function of the antenna device, such as an antenna for receiving or transmitting high-frequency signals, a printed circuit board, a foil or the like on which the antenna is arranged, a mechanical construction (such as a radome, a seal, etc.) are not shown, and electrical construction (such as cables, plug connectors, etc.) are not shown but are present.

[0023] Figure 1 The antenna device shown has a base plate 1, which is provided with a projection, in particular a dome 2, on its bottom side. The base plate 1 is made of plastic or metal. The dome 2 protrudes from the bottom side, but can also be oriented only or additionally in the direction of the other side of the base plate 1. It is also conceivable that the dome 2 can be omitted. The dome 2 has a threaded opening 3. The dome 2 is provided with at least one support 4 on its circumference, in this case precisely four supports 4. There are projections 5 on the bottom side of the base plate 1. With the help of these projections 5, the bottom side of the base plate 1 is kept spaced apart from the upper side of the vehicle body surface, which is necessary in particular in the following case: the bottom side of the seal and / or the radome protrudes on the bottom side of the base plate 1 on the circumference of the side edge of the base plate 1, so that the antenna device is supported uniformly on the vehicle body surface. For attaching a radome, which is not shown, the base plate 1 can have a plurality of notches 6 distributed on its circumference, through which, for example, screws are fed, by which the radome and the base plate 1 are connected to each other.

[0024] The front ends of the supports 4 are in particular selected so that they correspond to recesses in the body surface ( Figure 1 The side edge of the antenna assembly (not shown in the figure) is provided in order to guide the antenna assembly in a targeted manner and arrange it in a defined pre-assembly position after placement on the vehicle body surface.

[0025] A further element of the attachment device is an actuating element in the form of a screw 7. The screw 7 has a screw head 8 and a threaded member 9. The threaded member 9 corresponds to the internal thread in the threaded opening 3 in the dome 2. For example, it is also possible to provide only an internal thread on the base plate 1 (omitting the dome 2). Alternatively, the actuating element can also be formed as a locking element or expansion element. However, the advantage of configuring the actuating element as a screw 7 is that a defined force can be applied in order to permanently fix the antenna device to the body surface of the vehicle. This can be done, for example, by tightening the screw 7 with the aid of a torque wrench.

[0026] Furthermore, a first expansion element section 10 and at least one further expansion element section 11 are provided to form a single expansion element of the attachment device. In the following description and in the drawings, it is assumed that there are exactly two expansion element sections 10, 11 to form a single expansion element. However, it is also conceivable to use more than two expansion element sections to form a single expansion element. The two expansion element sections 10, 11 have flat areas 12, 14 and 13, 15, respectively. In an embodiment not shown, the corresponding flat areas 12, 14 and 13, 15, respectively, are located in the same plane. However, in accordance with Figure 1 In the design of the two expansion element parts 10, 11, the corresponding flat areas 12, 13 and 14, 15 are arranged offset to each other. Each expansion element part 10, 11 has a side arm 16 and 17 respectively, starting from the associated flat area 14 and 15. The side arms 16, 17 protrude from the flat area 14, 15 approximately at a right angle. At least one angled area 18 is provided on the outwardly directed upper surface of the side arms 16, 17. In accordance with Figure 1 In the design of , there is an inclined region 18 in each of the lateral elongated end regions of the side arms 16, 17. As can be seen from the figure, these angled regions 18 have been correspondingly bent in the lateral end regions of the side arms 16, 17, for example during the production of the corresponding expansion element parts 10, 11 by a stamping and bending method.

[0027] In the central area of ​​the flat areas 12, 14 and 13, 15 (regardless of whether these are arranged in one plane or offset from one another), there is in each case a recess 19 for an actuating element, in particular a screw 7. However, this recess 19 is not circumferentially closed, but has an opening towards the side and outwards (for example in the form of a slot). This opening enables the two expansion element parts 10, 11 to be matched by a movement transverse to the axial orientation of the actuating element, in particular the screw 7. This process is carried out by the two expansion element parts 10, 11 first being applied to one another at a specific angle and then matched (inserted into one another). Thereafter, the two matched expansion element parts are pivoted so that the flat area 12, 14 of the first expansion element part 10 rests flat on the associated flat area 13, 15 of the other expansion element part 11.

[0028] exist Figure 2 , the completed mating process and the completed pivoting and thus the final orientation of the two expansion element parts 10 , 11 for forming a single expansion element are shown.

[0029] In addition, Figure 1As can be seen in the figure, in this exemplary embodiment, an edge region 20 is present around the flat regions 12-15. This edge region 20 can also only be present in one of the two expansion element parts 10, 11. In the case of the expansion element parts 10, 11, this edge region 20 is also advantageously made from a metal substance by a stamping and bending method. After the fitting, the pivoting process of the two expansion element parts 10, 11 is advantageously supported by the edge region 20 and the two expansion element parts 10, 11 are positioned relative to each other in a defined position after the pivoting, from which they cannot leave without a further counter-pivoting movement.

[0030] In order to prestress the mating and pivoting expansion element parts 10, 11 at the base plate 1, there is a spring element 21. In the exemplary embodiment, this spring element 21 is formed as a helical spring, through which the screw 7 is fed. As a result, the helical spring is arranged in a targeted manner on the attachment device and the base plate 1, and thus the expansion element can be held in a defined state in the pre-installed position.

[0031] In reference Figure 1 and Figure 2 After describing the required elements of the attachment device, reference is made to Figure 3 .exist Figure 3 It can be seen that the bottom side of the substrate 1 is applied to the upper side of the body surface, in particular in the direction of the roof 22. The body surface has a cutout 23, through which the attachment means of the antenna device, which has been prepared on the bottom side of the substrate 1, are fed.

[0032] Therefore Figure 3 FIG. 1 shows the pre-installed position of the attachment device of the antenna device. Figure 2 The two pivoted mating expansion element parts 10, 11 are fixed to the dome 3 and prestressed. This is done in that the threaded piece 9 of the screw 7 has been passed through the now completely closed passage opening, which has been formed by the two expansion element parts 10, 11, and the spring element 21, in particular a helical spring, has likewise been pushed onto the threaded piece 9. Afterwards, the unit has been moved in the direction of the underside of the base plate 1, the end of the threaded piece 9 of the screw 7 having been screwed to a certain extent into the threaded opening 3 of the dome 2. As a result, a Figure 3 In other words, the prepared antenna device is moved by the attachment device at the front in the direction of the upper side of the vehicle body surface, wherein the attachment device is fed through the recess 23 in the vehicle body surface, in particular the roof 22, until the bottom side of the substrate 1 rests on the upper side of the vehicle body surface. This step is as shown in FIG. Figure 4As shown. In this case, it can be seen that when the attachment device is fed through the recess 23, the respective front end of the angled area 18, which preferably extends in an arcuate manner, rests on the circumferential edge of the recess 23. This in turn leads to the two side arms 16, 17 of the respective expansion element part 10, 11 being pressed together in the direction of the central axis of the attachment device extending along the screw 7, which pressing together occurs against the elastic force of the spring element 21. This pressing together is structurally possible because the two expansion element parts 10, 11 can be pivoted to a certain extent relative to each other about an axis transverse to the central axis of the attachment device. As a result, it may also be seen that the advantage is that when the antenna device is moved from its pre-mounted position in the direction of the final position, the expansion element parts 10, 11 themselves, in particular their side arms 16, do not have to provide any spring action or prestress. The spring action or prestress is provided only by the spring element 21, or in an alternative configuration, is not generated at all by omitting the spring element.

[0033] Although in Figure 4 2 shows the movement of the antenna device during the feeding of the attachment device of the antenna device through the recess 23 in the roof 22 and when the screw 7 has not moved out of the position it occupied in the pre-installation position, but in Figure 5 , in which the antenna device is permanently arranged and fixed on the roof 22 (typically the body surface of the vehicle). The final fixing is achieved in that the side arms 16 are moved again to a certain extent into their original position, with the substrate 1 resting on the side of the body surface in a parallel manner (if necessary, spaced apart due to the protrusions 5 and / or the circumferential seal and around the lower edge of the substrate 1 and / or the radome). In the exemplary embodiment, the final position of the side arms is reached by resting the distal ends of the angled areas 18 on the bottom side of the roof 22 and the stepped front sides (ends) of the side arms 16 on the circumferential edges of the recesses 23. This process takes place automatically by appropriately adjusting the corresponding geometries when the substrate 1 rests on the body surface as intended. In other words, the side arms 16 move back to the position they occupied in the pre-installation position and occupy the position due to the prestressing thereof by means of the spring elements 21. Figure 5 The location shown. Figure 5 The position of the side arm 16 occupied in the Figure 3 The original position of the side arm 16 in the pre-installed position shown. This means that Figure 3 In the pre-installed position, the side arm 16 protrudes more than in the final installed position. Figure 5 shown.

[0034] After the side arms 16 have been pressed together due to the feeding of the attachment device of the antenna device through the recess 23 in the body surface, and after the side arms 16 have been pivoted back again when the feeding through has been completed, they lead to a pre-latched position of the antenna device due to their geometry, in particular in combination with the angled area 18, so that the antenna device is first arranged in its final installation position on the body surface, but is not yet permanently and effectively fixed. The fixing is carried out by tightening the screw 7, as a result of which the base plate 1 is only slightly moved (pressed) in the direction of the upper side of the body surface. This tightening of the screw 7 is advantageously carried out with a predetermined torque, so that as soon as the predetermined torque is reached, the antenna device is permanently fixed to the body surface. Instead of fixing by turning the screw 7, it is also conceivable to permanently fix the antenna device to the body surface by means of a latching element, an expansion element, etc., which is used instead of the screw 7.

[0035] exist Figure 3-5 During the movement shown, it can also be seen that the support 4 protruding from the dome 2 provides guidance (due to its front bevel, which can also be configured in an arcuate manner) when the attachment device is inserted into the recess 23. As a result, a targeted feeding of the attachment device of the antenna device through the recess 23 and a pre-definition of the orientation of the antenna device on the body surface, in particular the roof 22, takes place.

[0036] The above-mentioned guide may be present, but does not necessarily have to be present. Also conceivable is, for example, a direction coding pin. A spike (pin) protruding from the base plate in the direction of the vehicle body before or after the locking mechanism is inserted into a hole during installation which determines the orientation of the roof antenna.

[0037] about Figure 3-5 The movement sequence described and depicted therein can obviously also be reversed for removal. For this purpose, the tightened screw 7 must be loosened and the side arms 16 must be pressed together in the direction of the center axis of the screw 7. As a result, the locking of the attachment device in the region of the cutout 23 in the body surface by the side walls 16 and their angled regions 18, which is required for pre-locking during installation, is omitted. If the side arms 16 are pressed together in the direction of the center axis of the screw 7, which can be done, for example, by hand or also with the aid of a tool, the antenna device can be lifted off the body surface and the attachment device can be pulled out of the cutout 23.

[0038] In summary, according to the invention, an improved antenna device, in particular an attachment device for an antenna device which is significantly improved compared to the prior art, can be obtained, which antenna device is very compact, requires fewer components, and is very easy to install. A particular simplification can be seen in that the antenna device can be prepared and used with its attachment device. Only afterwards, the antenna device prepared in this way is used when it is finally installed on the vehicle and can be handled very easily in this respect.

[0039] Reference numerals list

[0040] 1. Substrate

[0041] 2. Dome

[0042] 3. Threaded opening

[0043] 4. Support parts

[0044] 5. Protrusion

[0045] 6. Gap

[0046] 7. Screws

[0047] 8. Screw head

[0048] 9. Threaded parts

[0049] 10. First expansion element part

[0050] 11. Additional expansion element parts

[0051] 12. Flat Area

[0052] 13. Flat Area

[0053] 14. Flat Area

[0054] 15. Flat Area

[0055] 16. Sidewall

[0056] 17. Sidewall

[0057] 18. Angled Areas

[0058] 19. Gap

[0059] 20. Marginal Area

[0060] 21. Spring element

[0061] 22. Roof

[0062] 23. Incision

Claims

1. An antenna device for a vehicle, wherein: The antenna device comprises a substrate (1), an expansion element and an actuating element cooperating with the substrate (1) and the expansion element, characterized in that the expansion element is formed by a first expansion element part (10) and at least one further expansion element part (11) cooperating with the first expansion element part (10), wherein each expansion element part (10, 11) has two flat areas (12, 14; 13, 15), wherein the two flat areas of each expansion element part (10, 11) are oriented offset from each other in a plane, wherein a side arm (16) protrudes from the flat area of ​​the first expansion element part (10) at an angle, and the side arm (16) 17) protrudes from a flat area of ​​at least one further expansion element part (11), wherein when the expansion element is arranged on the base plate (1), the side arms (16, 17) extend in the direction of the base plate (1), wherein a notch (19) is provided in the central area of ​​each flat area (12, 14; 13, 15), the notch having a slot-like opening facing laterally outwards, for enabling the first expansion element part (10) to cooperate with the at least one further expansion element part (11), the cooperation taking place transversely to the axial orientation of the actuating element and for forming a circumferentially closed single channel opening for the actuating element.

2. The antenna device according to claim 1, characterized in that The first expansion element part (10) and the at least one further expansion element part (11) are prestressed by means of spring elements on the base plate (1).

3. The antenna device according to claim 2, characterized in that The spring element (21) is formed as a helical spring.

4. The antenna device according to any one of claims 1 to 3, characterized in that: An angled edge region (20) exists at least partially around the flat region.

5. The antenna device according to any one of claims 1 to 3, characterized in that: The side arm (16, 17) has at least one angled region (18) oriented in the longitudinal direction of the side arm, which ends at a distance from the front end of the side arm and / or has an arc in its axial extension at the front end.

6. The antenna device according to any one of claims 1 to 3, characterized in that: The side arms (16, 17) have two parallel angled regions (18).

7. The antenna device according to any one of claims 1 to 3, characterized in that: At least two expansion element sections are formed from a plastic material.

8. The antenna device according to any one of claims 1 to 3, characterized in that: At least two expansion element parts are formed from a metallic substance.

9. The antenna device according to any one of claims 1 to 3, characterized in that: At least two expansion element parts are designed as identical parts.

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