Coaxial contact system and method for electrically connecting two outer conductors

Abstract

To provide a coaxial contact system and a method for electrically connecting a first outer conductor of a first coaxial conductor to a second outer conductor of a second coaxial conductor.SOLUTION: A coaxial contact system for electrically connecting a first outer conductor 110 of a first coaxial conductor to a second outer conductor 104 of a second coaxial conductor includes: an inner contact sleeve 116 which forms a support sleeve; and an outer contact sleeve 118 which at least partially surrounds the inner contact sleeve and forms a crimp sleeve, the crimp sleeve being crimped around the first outer conductor 110 and the second outer conductor 104 in a final assembled state. The inner contact sleeve 116 and the outer contact sleeve 118 are designed such that the first outer conductor 110 is arranged in an axial direction or a radial direction next to the second outer conductor 104 on the inner contact sleeve 116.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a coaxial contact system and method for electrically connecting a first outer conductor of a first coaxial conductor to a second outer conductor of a second coaxial conductor.

[0002] The principles available are particularly suited to the electrical contacting of shields, but can also be used generally for the electrical connection of the outer conductor of any type of coaxial conductor. [Background technology]

[0003] Electrical cables carrying high voltages on their inner conductors require electrical shielding to prevent interference with nearby electrical or electronic components. Shielding can also be provided to protect the inner conductor from external electrical and / or magnetic interference. For example, a shielding braid, consisting of multiple strands of conductive material, is provided to encase the electrical inner conductor. In this case, the shielding braid is typically located inside the cable sheath, between the primary insulation (also known as the inner sheath) and the shielding braid, and the secondary insulation (also known as the outer sheath or cable sheath) that surrounds the shielding braid on the outside. To enhance the shielding effect of the shielding braid, a shielding film can be provided either between the primary insulation and the shielding braid or between the shielding braid and the secondary insulation. This is usually a copper-clad aluminum film. This shielding film does not conduct any significant current and will cut when in contact with the shield braid, leaving the shield braid exposed.

[0004] To ensure an equipotential bond between the shield of the inner conductor and the shield braid, it is necessary to connect the shield braid to ground in the end region of an electric cable. For this purpose, at least one contact element that is conductively connected to the shield braid and can be connected to ground is usually provided at each end of the cable. Furthermore, when connecting two shielded cables, it is necessary to ensure that the shields are connected to each other. This also needs to be ensured when connecting the shielded cables to the contact element, for example, by connecting the shield plate of the connector to the cable shield.

[0005] For example, a known method for connecting a copper shielding braid to a contact element involves sliding a support sleeve onto the secondary insulation of the cable and folding the exposed shielding braid back onto the support sleeve. The contact element is then guided over the support sleeve and the shielding braid placed thereon and then radially compressed (pressurized, pressure grouted, pressure grouted) using a suitable tool for contacting, e.g., crimping. The crimping process clamps the shielding braid between the support sleeve and the contact element. This method can only be used with materials that have good lateral conductivity, since the shielding braid is only crimped at certain points.

[0006] Aluminum and aluminum alloys are also suitable as conductive materials for shielding braids and, due to their low mass, are used in many applications, for example in the automotive sector, especially in electric vehicles. High-voltage cables with aluminum braids are cheaper and lighter than cables with (usually tinned) copper braids. However, such aluminum braided cables have, to date, had significant drawbacks.

[0007] Aluminum generally has a lower electrical conductivity than tinned copper.

[0008] When aluminum or aluminum alloy wires are crimped together, they already have an oxide layer on their surface that is very difficult to penetrate. The contact process typically used in copper shielding technology for shielding braids by radial crimping cannot establish contact between all aluminum wires in the aluminum shielding braid and the contact elements because the oxide layer that forms on the aluminum wires inhibits lateral conductivity in the crimped area. Therefore, known methods cannot destroy the oxide layer on all wires in the shielding braid. Furthermore, even if the oxide layer is destroyed during crimping, new oxide immediately forms at and around the contact points. It has also been shown that known contact methods for aluminum shielding braids cannot achieve a stable connection under temperature-varying stresses.

[0009] To ensure uniform shielding contact with these materials, known methods for connecting aluminum shielding braids use additional measures to ensure contact between all aluminum wires and, if necessary, to break down the oxide layer. All of these known solutions still have drawbacks and often produce unsatisfactory results, particularly with regard to electromagnetic compatibility (EMC), compared to conventional crimped copper braids. In particular, there is a risk that EMC may deteriorate over time to the point where it no longer meets acceptable limits.

[0010] Furthermore, many of the known solutions require a relatively large amount of space in the radial direction, which is particularly disadvantageous for applications in the automotive sector. Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, there is a need for a coaxial contact system that overcomes the shortcomings of known arrangements and provides electrical contact between two coaxial outer conductors in a cost-effective, space-saving manner with optimal electromagnetic compatibility. [Means for solving the problem]

[0012] This problem is solved by the subject matter of the independent claims. Preferred further developments of the invention are the subject matter of the dependent claims.

[0013] The present invention is therefore based on the idea that the first and second outer conductors are arranged adjacent to each other in the axial or radial direction between two contact sleeves, rather than overlapping each other in the radial direction, and then compressed (pressurized, pressure grouted) by a crimping process. In this way, on the one hand, less radial material needs to be pressed between the contact sleeves to bring them into contact, and therefore an increased contact pressure can be generated around the radial circumference. On the other hand, the required radial space is reduced, which allows for a reduction in the size of the connectors, especially when they are brought into contact with each other. It should also be noted that the absence of contact between the two outer conductors makes it possible to provide space.

[0014] Specifically, the present invention provides a coaxial contact system for electrically connecting a first outer conductor of a first coaxial conductor to a second outer conductor of a second coaxial conductor, the coaxial contact system comprising: an inner contact sleeve forming a support sleeve; and an outer contact sleeve at least partially surrounding the inner contact sleeve and forming a crimp sleeve, the crimp sleeve being crimped around the first outer conductor and the second outer conductor in a final assembled state. The inner and outer contact sleeves are configured such that the first outer conductor is positioned axially or radially adjacent the second outer conductor on the inner contact sleeve.

[0015] By separating the contact areas with the respective outer conductors axially or radially, these contact areas can be specifically adapted to the properties of the outer conductors they contact. Thus, the inner and / or outer contact sleeves need not have constant properties along their axial extension or over their entire circumference. In particular, materials and / or structures that vary axially or radially may be provided.

[0016] The solution according to the invention can also be used with any cable diameter in various coaxial applications. No adjustments need to be made to the contacting outer conductor (e.g., shield braid, solid tube, or connector shield). The inner and / or outer sleeves can be appropriately coated but otherwise made of inexpensive materials.

[0017] Alternatively, either the inner or outer contact sleeve, or both, can be formed by the peripheral region of the first outer conductor and / or the second outer conductor. This means that the inner and / or outer contact sleeve do not need to be separate parts if one or both of the outer conductors assumes, in addition to the electrical task, the mechanical task of the inner support sleeve and / or the deformed outer sleeve. If separate contact sleeves are not provided, the inner outer conductor forms the inner contact sleeve, which provides mechanical support, and the outer conductor forms the crimped (deformed) outer contact sleeve.

[0018] In other words, by configuring the inner contact sleeve and / or the outer contact sleeve to be integral with the first outer conductor or the second outer conductor, a significant reduction in the radial space required can also be achieved.

[0019] According to a preferred development of the coaxial contact system, the inner and / or outer contact sleeve has a microstructured contact area that, in the final assembled state, electrically contacts the first and / or second outer conductor. If present, such microstructures form protrusions that can penetrate the electrically insulating surface layer of the contacted outer conductor. This significantly reduces the electrical contact resistance at the interface with the outer conductor.

[0020] In this case, the microstructured contact area may be at least partially integrally formed with the inner and / or outer contact sleeve. Producing the microstructured contact area integrally, i.e., in one piece, with the respective sleeves has the advantage of simplified manufacturing and assembly and improved electrical conductivity. The microstructured contact area may also be configured as a separate element, such as a screen plate. This has the advantage that a different material can be selected for the microstructured contact area than for the respective sleeves. Two outer conductors can be contacted by different microstructured contact areas in the axial direction.

[0021] According to a preferred development, the microstructured contact area is at least partially formed as an additional coating on the inner and / or outer contact sleeve, which is applied together with the respective contact sleeve in one processing step and can still be made of a different material than the contact sleeve.

[0022] For example, the microstructured contact area may be at least partially formed by embossing, punching, and / or screen plate. The selection of the most suitable embodiment depends on the type of outer conductor to be contacted and the subsequent application environment.

[0023] According to a preferred embodiment of the present invention, the microstructured contact area is at least partially formed by surface structuring by cold spraying. Cold spraying is a coating method in the field of thermal spraying. Compared to conventional methods, cold spraying offers particular advantages because the sprayed material does not melt or fuse during the process. This allows for a wider and more flexible range of applications than other thermal processes.

[0024] The high kinetic energy of the particles upon impact with the part and the resulting large deformation generally allow the formation of homogeneous, very dense layers with layer thicknesses varying from several hundred millimeters to several centimeters.

[0025] For example, a metallic coating is formed whose physical and chemical properties are similar to those of the respective sleeve substrate. A process gas, preferably nitrogen or helium, is supplied to the spray gun at a pressure of up to 50 bar and heated to a maximum temperature of up to 1100°C within the gun housing.

[0026] The heated, highly pressurized gas is then expanded to ambient pressure in a convergent-divergent nozzle, whereby the process gas is accelerated to supersonic velocities while simultaneously being cooled to temperatures below 100°C.

[0027] The spray powder is injected by a powder feeder and a similar carrier gas in the converging region of the nozzle and accelerated in the main gas stream to particle velocities of up to 1200 m / s. The particles impact the (often untreated) part surface in a highly focused spray jet, simultaneously deforming the substrate and themselves, forming a tightly adherent, dense, low-oxide layer with the desired surface roughness.

[0028] To facilitate the application of the cold spray surface structuring, the inner and / or outer contact sleeve can also consist of several parts, for example two half-shells, although to a certain extent it is also possible to perform the cold spray surface structuring on the inner surface of a closed tubular contact sleeve by directing the particle jet at a shallow angle towards the inner surface.

[0029] When the inner contact sleeve and / or the outer contact sleeve are configured to be integral with the first outer conductor or the second outer conductor, it is possible to provide a microstructured surface on the separate contact sleeve or on the first outer conductor and / or the second outer conductor as well.

[0030] The present invention provides a method for electrically connecting a first outer conductor of a first coaxial conductor to a second outer conductor of a second coaxial conductor, the method comprising: attaching the inner contact sleeve so that the inner contact sleeve is disposed radially inside (inside, below) the first outer conductor and the second outer conductor; attaching an outer contact sleeve such that the outer contact sleeve at least partially surrounds the inner contact sleeve to form a crimp sleeve; crimping the crimp sleeve such that the crimp sleeve is crimped to the first outer conductor and the second outer conductor; Including, The first outer conductor is disposed axially or radially adjacent to the second outer conductor in the inner contact sleeve.

[0031] Alternatively, the inner contact sleeve and / or the outer contact sleeve may be configured to be integral with the first outer conductor or the second outer conductor, thereby achieving a significant reduction in the radial space required.

[0032] For example, in the method, the inner contact sleeve and / or the outer contact sleeve may have microstructured contact regions that electrically contact the first outer conductor and / or the second outer conductor in the final assembled state.

[0033] According to a preferred embodiment, the microstructured contact area is at least partially integral with the inner and / or outer contact sleeve. Alternatively, a separate part can be provided which is connected to one of the contact sleeves before assembly or only by the crimping process.

[0034] Furthermore, the microstructured contact area may be at least partially formed as an additional coating on the inner contact sleeve and / or the outer contact sleeve.

[0035] For example, the microstructured contact area can be formed at least in part by embossing, punching, electroplating, and / or a separate screen plate.

[0036] According to a preferred embodiment, the microstructured contact area is at least partly formed by surface structuring by cold spraying.

[0037] The method according to the above aspect can be used particularly advantageously when the first outer conductor is formed by the shield of a connector and / or the second outer conductor is formed by the shield of a cable, in particular when the cable shield comprises an aluminum wire braid.

[0038] For a better understanding of the present invention, a more detailed description will be given using the embodiments shown in the following figures. The same parts are provided with the same reference numerals and part names. Furthermore, some features or combinations of features from the various embodiments shown and described may also represent independent inventive solutions or solutions according to the present invention. [Brief explanation of the drawings]

[0039] [Figure 1] 1 is a perspective view of a connector arrangement for a preferred application of the coaxial contact system; FIG. [Figure 2] 2 is a cross-sectional view of a detail of the connector arrangement shown in FIG. 1. [Figure 3] FIG. 3 is an enlarged detail view of FIG. 2. [Figure 4] 1 is a schematic cross-sectional view of a coaxial contact system according to a first example; [Figure 5] 5 is a schematic cross-sectional view of the current flow through the coaxial contact system according to FIG. 4. [Figure 6] FIG. 10 is a schematic cross-sectional view of a coaxial contact system according to a second example. [Figure 7] FIG. 10 is a schematic cross-sectional view of a coaxial contact system according to a third example. [Figure 8] 10 is a schematic perspective view of a coaxial contact system according to a further example; [Figure 9] FIG. 9 is a schematic cross-sectional view of the arrangement shown in FIG. 8. [Figure 10] 10 is a schematic cross-sectional view of a coaxial contact system according to a further example. DETAILED DESCRIPTION OF THE INVENTION

[0040] 1 shows a perspective view of an application of the coaxial contact system according to the invention for connecting a cable shield to the shield of a connector, although it is emphasized that the principles outlined below can also be used in any other application for conductively connecting the outer conductors of two coaxial conductors.

[0041] 1 shows a partially exploded perspective view of a high performance connector 100 used, for example, to connect a mating plug of a battery connection (not shown) to a cable 102 in an automobile. The cable 102 has a shield 104, which may be formed, for example, from a solid aluminum tube.

[0042] A cable shield 104 concentrically surrounds an inner conductor 106. The cable shield 104 is separated from the inner conductor 106 by a first insulating layer 108. To connect the inner conductor 106 to a battery (not shown), a connector is provided having a contact element 114 surrounded by a connector shield 110.

[0043] 1, the connector shield 110 is formed by two half-shells 110A and 110B. Two insulators 112A, 112B provide electrical insulation from the contact elements 114. These two insulators 112A, 112B are also formed as half-shells and form the insulator 112 that surrounds the contact elements 114.

[0044] The shield 104 must be securely electrically connected to both half-shells 110A, 110B of the connector shield 110. For this purpose, an inner contact sleeve 116 and an outer contact sleeve 118 are provided, as more clearly shown in Figure 2. The outer contact sleeve 118 forms a crimp sleeve and is crimped onto the two shields 104, 110 for final assembly and contact.

[0045] The connector shield 110 can be made of, for example, a copper-nickel-silicon alloy. Copper alloys containing nickel and silicon are characterized by corrosion resistance and excellent mechanical and electrical properties. The inner conductor 106 of the cable 102 can be, for example, a solid aluminum conductor.

[0046] FIG. 2 shows in exploded view form the high performance connector 100 in detail the contacting of the two shields 104, 110 according to the present invention.

[0047] In accordance with the present invention, the connector shield 110 and the cable shield 104 are positioned adjacent to each other along the longitudinal axis 122 in the inner contact sleeve 116. Unlike known arrangements, the connector shield 110 and the cable shield 104 do not overlap and therefore do not form a laminated structure. The inner contact sleeve 116 forms a support sleeve that withstands the mechanical pressure of the crimping process.

[0048] Additionally, in the exemplary embodiment shown in FIG. 2, the contact areas of the inner contact sleeve 116 that contact the connector shield 110 and the cable shield 104 are provided with microstructured contact areas 120 .

[0049] The microstructured contact area 120 can be generated in various ways, in the general case as a kind of roughness.

[0050] For example, the shields 104, 110 may be provided with an embossed, engraved, notched, knurled, punched, or similarly textured surface to reduce electrical resistance to the contacting shields 104, 110. This allows the microstructured contact region 120 to be integrally formed with the material of the sleeve (also called a ferrule).

[0051] Alternatively or additionally, additional material added to the ferrule can form the microstructured contact region 120 .

[0052] In addition to protrusions, a screen plate with small holes having punched edges or depressions can also be used to create the required roughness.

[0053] In a particularly preferred embodiment, the microstructured contact area 120 is at least partially formed by surface structuring by cold spray. As already mentioned, the so-called cold spray method is a thermal spraying process in which, for example, a metal layer is applied to a substrate by molten, highly accelerated particles. The impinging particles form a tightly adherent, dense, low-oxide layer with a predetermined surface roughness without significantly heating the sleeve.

[0054] This coating on the inner contact sleeve 116 allows for efficient 360° contact between the connector shield 110 and the cable shield 104. Because the connector shield 110 and the cable shield 104 are positioned adjacent to each other on the surface of the inner contact sleeve 116, significantly less space is required transverse to the longitudinal axis 122 than in a conventional sandwich arrangement.

[0055] FIG. 3 shows a further enlargement of the arrangement of FIG.

[0056] The actual crimp area is again shown in more detail in Figure 4. According to the embodiment shown in Figure 4, the outer side of the inner sleeve 116 is provided with a microstructured contact area 120. The microstructured contact area forms an interface with both the connector shield 110 and the cable shield 104.

[0057] This results in a current flow as shown in Figure 5. The microstructured contact area 120 allows the inner contact sleeve 116 to function particularly efficiently as a connecting element between the connector shield 110 and the cable shield 104.

[0058] In this case, both the connector shield 110 and the cable shield 104 are connected to the inner contact sleeve 116, in particular to its microstructured contact area 120. The necessary current flow therefore does not occur directly between the connector shield 110 and the cable shield 104, but rather via the inner contact sleeve 116. This ensures that, in the case of a wire braid, each individual wire is in electrical contact and that this contact is maintained over a sufficient length. Furthermore, the length of the contact area can be optimized relative to the length of the outer contact sleeve 118. In particular, with the provision of the microstructured contact area 120, it is possible to achieve penetration of the oxide layer of each wire even in an aluminum braid.

[0059] Alternatively, the microstructured contact area 120 may be provided on the inside of the outer contact sleeve 118. This embodiment is shown in highly schematic form in FIG.

[0060] Finally, there is the option of providing a first microstructured contact area 120A on the outside of the inner contact sleeve 116 and a second microstructured contact area 120B on the inside of the outer contact sleeve 118. This embodiment may have the disadvantage of being more costly to manufacture the inner and outer contact sleeves 116, 118, but on the other hand has the advantage of a particularly high electrical contact and stability against vibrations and thermal stresses.

[0061] 8 and 9, a further embodiment of the present invention will be described in which the first outer conductor 210 and the second outer conductor 204 do not cover the entire 360° circumference, but rather only cover a smaller circumferential range, preferably less than 180°. This means that the first outer conductor 210 and the second outer conductor 204 are arranged adjacent to each other in the circumferential direction. The first outer conductor 210 and the second outer conductor 204 may be in contact, but this is not required. The radially adjacent arrangement shown in FIGS. 8 and 9 can allow for a significantly shorter axial construction in preferred embodiments.

[0062] In this case, the surface treatment of the inner contact sleeve 216 and the outer contact sleeve 218 can be carried out in the same manner as in the embodiment shown in FIGS.

[0063] For example, even if the first outer conductor 210 covers less than 360° of the circumference, if the axial displacement is as shown in FIG. 10, the configuration is compatible with the second outer conductor 204 covering more than 180°, e.g., 360°, of the circumference in the case of a shield braid.

[0064] Alternatively, a significant reduction in the radial space required can be achieved by configuring the inner and / or outer contact sleeve to be integral with the first or second outer conductor. In other words, either the first or second contact sleeve, or both, are not provided as separate components but are an integral part of the first or second outer conductor. In that case, the inner or outer surfaces of the connecting regions of the first and / or second outer conductor can be provided with a microstructured surface in accordance with the principles described above.

[0065] In summary, the present invention has the advantage that the overall construction size of the coaxial contact system can be reduced, and in particular the outer diameter of the crimp sleeve can be reduced, since no laminate structure is required for the two outer conductors to be connected (e.g., connector shield and cable shield).

[0066] By separating the two outer conductors to be connected either axially or radially, each of the two contact zones can be optimized with respect to individual requirements.

[0067] The solution according to the invention also makes it possible to move the actual electrical contact area to the inner ferrule, which is much stronger, rather than to the surface of the connector shield, which is often weaker.

[0068] The number of process steps is significantly reduced and the type of outer conductor to be connected can be adapted as needed.

[0069] It has been shown that aluminum braid can achieve sufficient electromagnetic compatibility due to the improved electrical contact with the aluminum wire, which improves current flow and reduces impedance. [Explanation of symbols]

[0070] 100 High Performance Connectors 102 Cable 104, 204 Cable shield, second outer conductor 106 Inner conductor 108 First insulating layer 110, 210 Connector shield, first outer conductor 110A First Half Shell 110B Second half shell 112A First Insulator 112B Second insulator 114 Contact Elements 116, 216 Internal contact sleeve 118, 218 Outer contact sleeve, crimp sleeve 120 Microstructured contact area 120A first microstructured contact area 120B Second microstructured contact region 122 Longitudinal axis

Claims

1. 1. A coaxial contact system for electrically connecting a first outer conductor (110) of a first coaxial conductor to a second outer conductor (104) of a second coaxial conductor, said coaxial contact system comprising: an inner contact sleeve (116) forming a support sleeve; an outer contact sleeve (118) at least partially surrounding the inner contact sleeve to form a crimp sleeve, the crimp sleeve being crimped around the first outer conductor (110) and the second outer conductor (104) in a final assembled state; Equipped with The inner contact sleeve (116) and the outer contact sleeve (118) are designed so that the first outer conductor (110) is positioned axially or radially adjacent to the second outer conductor (104) in the inner contact sleeve (116).

2. 1. A coaxial contact system for electrically connecting a first outer conductor (110) of a first coaxial conductor to a second outer conductor (104) of a second coaxial conductor, said coaxial contact system comprising: an inner contact sleeve (116) forming a support sleeve; an outer contact sleeve (118) at least partially surrounding the inner contact sleeve to form a crimp sleeve, the crimp sleeve being crimped around the first outer conductor (110) and the second outer conductor (104) in a final assembled state; Equipped with A coaxial contact system, wherein the inner contact sleeve (116) and / or the outer contact sleeve (118) are configured to be integral with the first outer conductor (110) or the second outer conductor (104).

3. 3. The coaxial contact system according to claim 1, wherein the inner contact sleeve (116) and / or the outer contact sleeve (118) have a microstructured contact area (120) that electrically contacts the first outer conductor (110) and / or the second outer conductor (104) in the final assembled state.

4. The coaxial contact system of claim 3 , wherein the microstructured contact area (120) is at least partially integrally formed with the inner contact sleeve (116) and / or the outer contact sleeve (118).

5. 5. The coaxial contact system according to claim 3, wherein the microstructured contact area (120) is at least partially configured as an additional coating on the inner contact sleeve (116) and / or the outer contact sleeve (118).

6. 6. A coaxial contact system according to any one of claims 3 to 5, wherein the microstructured contact area (120) is at least partially formed by embossing, punching and / or screen plate.

7. 7. The coaxial contact system of claim 3, wherein the microstructured contact area (120) is at least partially formed by cold spray surface structuring.

8. 1. A method for electrically connecting a first outer conductor (110) of a first coaxial conductor to a second outer conductor (104) of a second coaxial conductor, the method comprising: Mounting the inner contact sleeve (116) so that the inner contact sleeve (116) is disposed radially inside the first outer conductor (110) and the second outer conductor (104); attaching an outer contact sleeve (118) such that the outer contact sleeve at least partially surrounds the inner contact sleeve to form a crimp sleeve; crimping the outer contact sleeve (118) so that the outer contact sleeve (118) is crimped to the first outer conductor (110) and the second outer conductor (104); Including, the first outer conductor (110) is disposed axially or radially adjacent to the second outer conductor (104) in the inner contact sleeve (116); and / or The method, wherein the inner contact sleeve (116) and / or the outer contact sleeve (118) are configured to be integral with the first outer conductor (110) or the second outer conductor (104).

9. 9. The method of claim 8, wherein the inner contact sleeve (116) and / or the outer contact sleeve (118) have microstructured contact areas (120) that electrically contact the first outer conductor (110) and / or the second outer conductor (104) in a final assembled state.

10. The method of claim 9, wherein the microstructured contact area (120) is at least partially integrally formed with the inner contact sleeve (116) and / or the outer contact sleeve (118).

11. 11. The method of claim 9 or 10, wherein the microstructured contact area (120) is at least partially configured as an additional coating on the inner contact sleeve (116) and / or the outer contact sleeve (118).

12. 12. The method of any one of claims 9 to 11, wherein the microstructured contact area (120) is at least partially formed by embossing, punching, electroplating, and / or a separate screen plate.

13. 13. The method of any one of claims 9 to 12, wherein the microstructured contact area (120) is at least partially formed by surface structuring by cold spraying.

14. 14. The method according to any one of claims 9 to 13, wherein the first outer conductor (110) is formed by a shield of a connector.

15. 15. The method according to any one of claims 9 to 14, wherein the second outer conductor (104) is formed by a shield of a cable.

16. The method of claim 15, wherein the shield (104) of the cable comprises an aluminum wire braid.

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