Multi-layer flat ribbon cable, connection method and connection for transmitting electrical signals

Abstract

The present invention relates to a multilayer flat ribbon cable (1) for transmitting electrical signals comprising: an insulation (2), a plurality of conductors (4) arranged in the insulation (2) in a matrix form and extending along a first direction (X) in the insulation (2), wherein conductors (4) spaced apart along a second direction (Y) form a layer (L) with an adjacent insulation layer (3) of a predetermined first height (H1) along a third direction (Z), and at least one end section (11) for contacting a complementary counterpart (101), wherein the at least one end section (11) has a step shape, and each step (S) comprises the respective insulation layer (3), at least one exposed conductor section (5) and at least one terrace section (6) which does not have a conductor section (5), of a layer (L).The present invention further relates to a connection method and a connection (100) for transmitting electrical signals.

Description

Technical field

[0001] The invention relates to a multilayer flat ribbon cable, a connection method and a connection for the transmission of electrical signals, in particular high-frequency signals. State of the art

[0002] Multilayer flat ribbon cables (also called flexible flat ribbon cables) can be used for the transmission of electrical signals, especially high-frequency signals. Multilayer flat ribbon cables are characterized by the fact that several conductors, separated by insulation, are arranged side by side (in a first direction) in one layer, and several layers, comprising conductors and insulation, are arranged one above the other (in a second direction).

[0003] For connecting a single-layer ribbon cable to a counterpart, such as another ribbon cable, a connector or a PCB (printed circuit board), it is known from the prior art to completely expose the conductors for soldering in a contact section and then solder them, for example by hand, with solder wire and a soldering iron.

[0004] With multilayer ribbon cables, the problem arises that the conductors are no longer completely exposed, but rather that at least one additional layer of conductors and insulation lies over the conductors of a layer. One possible approach for multilayer ribbon cables could be a so-called underside solder termination. Two methods for producing underside solder terminations are known in the prior art, for example, in the production of microchips: BGA (ball grid array) soldering and underside soldering with solder paste. However, these methods have disadvantages. In BGA soldering, BGA balls are positioned on the conductor contacts. Positioning the BGA balls is very complex and requires trained personnel and appropriate equipment. The reliability of the (BGA) solder joint can be compromised, and repair costs can be high.When soldering components from the underside using solder paste and without standoffs, short circuits can easily occur (due to the uncontrolled spread of solder paste when pressing the components to be soldered). To avoid short circuits, the components to be soldered must be held at a precisely defined distance. Description of the invention

[0005] It is therefore an object of the present invention to provide devices and methods with which process stability can be achieved without damaging the layers of the multilayer flat ribbon cable, whereby the handling of the devices and methods should be implemented using simple means.

[0006] The aforementioned problem is solved by a multilayer flat ribbon cable according to claim 1, a joining method according to claim 8, and a connection according to claim 11. Further advantageous embodiments of the invention can be found in the dependent claims, the description, and the drawings.

[0007] In particular, the above-mentioned problem is solved by a multilayer flat ribbon cable for transmitting electrical signals, comprising insulation extending flat along a first direction, a plurality of conductors arranged in the insulation in a matrix form and extending along the first direction in the insulation, wherein conductors spaced apart along a second direction, transverse to the first direction, form a layer with an adjacent insulation layer of a predetermined first height, along a third direction, transverse to the first and second directions, and at least one end section for contacting a complementary counterpart, wherein the at least one end section has a step form, and each step comprises the respective insulation layer, at least one exposed conductor section, and at least one terrace section that does not have a conductor section, of a layer.

[0008] The present multilayer flat ribbon cable has the advantage of being very easy to produce, preferably by removing insulation (layers) from the end section. The different heights of the conductors and insulation layer, which can also be created on a complementary counterpart, result in an asymmetrical stepped structure. In particular, one end section of the complementary counterpart has a complementary (asymmetrical) stepped shape. This asymmetry means that when a multilayer flat ribbon cable and a complementary counterpart are joined together, the stepped sections act as stoppers and prevent further joining. Consequently, gaps or cavities form between opposing exposed conductor sections of the multilayer flat ribbon cable and the joined counterpart.Due to the height differences between the first and second levels, cavities have a predetermined distance or volume. By maintaining this predetermined distance or volume, a precisely measured amount of bonding paste can be applied, ensuring a reliable connection and preventing unwanted short circuits.

[0009] Preferably, in each stage, at least one exposed conductor section rests on the insulation layer of the layer. If an exposed conductor section were completely free of insulation, it could or would be subject to forces, such as gravity, and unintentionally deformed. Because the exposed conductor section rests on the insulation layer, it is firmly connected to the structure of the multilayer flat ribbon cable, particularly the insulation, and securely fixed. This secure fixation facilitates the application of bonding paste and / or the alignment of a complementary counterpart on the exposed conductor section.

[0010] Preferably, the conductors of each layer have a second height, and in each layer, the first height of the insulation layer is greater than the second height of the conductors. Preferably, the first height is at least twice the second height. These height differences allow for an asymmetrical stepped structure, thereby creating predetermined cavities between opposing exposed conductor sections of the multilayer flat ribbon cable and a complementary counterpart. The greater the height difference between the first and second heights, the larger the predetermined volume between the opposing exposed conductor sections in a layer.

[0011] Preferably, the conductors of a layer are connected to each other, preferably continuously, within individual layers. If the conductors of a layer are connected to each other at least at certain points, preferably continuously, within their layer, they form a planar electrical conductor. Such a planar electrical conductor, if it encloses at least one (inner) conductor (at least partially, preferably completely), can serve as an outer conductor for the (inner) conductor and shield it. The shielded conductor would then be suitable for (high-frequency) data signal transmission.

[0012] Preferably, the multilayer flat cable has at least a first, second, and third layer. With at least three layers, and preferably at least three conductors in the second or middle layer, a shielded signal line can be created within the multilayer flat cable. A shielded signal line enables, for example, interference-free transmission of high-frequency signals.

[0013] Preferably, the multilayer flat cable further comprises a termination step that has no exposed conductor section. The termination step forms a stop along the first direction for a complementary counterpart on the multilayer flat cable and facilitates alignment and connection. The termination step can be easily formed by machining in an outer insulating layer. The outer step can also result in a flat outer surface at the connection between the multilayer flat cable and its complementary counterpart.

[0014] Preferably, the multilayer flat cable further comprises at least two boundaries formed at at least one end section, where the end section has no stepped shape. These boundaries serve as stops along the second direction for a complementary counterpart on the multilayer flat cable and facilitate alignment and connection. The boundaries can be generated very simply by not forming any stepped shape in the multilayer flat cable at their locations.

[0015] The aforementioned problem is further solved, in particular, by a joining method for connecting a multilayer flat ribbon cable to a complementary counterpart, wherein the multilayer flat ribbon cable comprises at least: insulation, a plurality of conductors arranged in the insulation in a matrix form, wherein conductors spaced apart along a direction form a layer with an adjacent insulation layer of a predetermined first height, and at least one end section for contacting the complementary counterpart, wherein the at least one end section has a step form and each step comprises the respective insulation layer, at least one exposed conductor section, and a terrace section that does not have a conductor section, wherein the method comprises the following steps: providing the multilayer flat ribbon cable and aligning it along a first direction,Applying a bonding paste to the at least one exposed conductor section, aligning and arranging the complementary counterpart on the end section so that at least one terrace section of the multilayer ribbon cable and the complementary counterpart are in contact and the bonding paste forms an adhesive bond between the at least one exposed conductor section of the multilayer ribbon cable and an opposing exposed conductor section of the complementary counterpart, and connecting the multilayer ribbon cable to the complementary counterpart so that a permanent mechanical and electrical connection is created via the bonding paste.

[0016] The present method is easy to implement and does not place excessive demands on process precision; rather, the precision results from the structure of the multilayer flat cable and its complementary counterpart. The (asymmetrical) stepped shape creates cavities of a predetermined volume between the exposed conductor sections of the multilayer flat cable and its counterpart. By positioning the opposing terrace sections of the multilayer flat cable and its counterpart, a predetermined distance or volume is always maintained. Due to this predetermined distance, the opposing exposed conductor sections of the multilayer flat cable and its counterpart do not directly touch.By preventing the volume from falling below the predetermined level, the bonding paste is not squeezed beyond the exposed conductor sections, which could otherwise lead to a short circuit between individual exposed conductor sections within a layer. The amount of bonding paste applied is precisely matched to the predetermined volume and is just sufficient to create a reliable mechanical and electrical connection. The process can be automated.

[0017] Preferably, the bonding paste comprises a solder paste that is applied in the form of a hemisphere with a predetermined radius. The hemisphere shape can form with any bonding paste. This hemispherical shape is created by the surface tension of the solder or bonding paste. The amount of bonding paste determines the radius. When applied to a horizontal surface, i.e., the at least one exposed conductor section, the hemisphere of the bonding paste remains stationary (i.e., it does not spread) and can thus be easily processed further.

[0018] Preferably, the step of joining the multilayer ribbon cable to its complementary counterpart comprises heating and / or curing the bonding paste. Heating and curing particularly includes a soldering process. Soldering processes are easy to implement and create a reliable, permanent connection. Curing can also be achieved by alternative methods, such as heat, drying, or chemical processes.

[0019] The aforementioned problem is further solved, in particular, by a connection for transmitting electrical signals, whereby the connection comprises at least: a multilayer ribbon cable and a complementary counterpart, the complementary counterpart being a corresponding ribbon cable, a connector, or a printed circuit board connection. The various connection options allow for highly flexible signal transmission.

[0020] The following description of embodiments is given with reference to the accompanying figures. These show: Fig. 1 a perspective view of a first embodiment of a multilayer flat ribbon cable; Fig. 2 a side view of the first embodiment Fig. 1; Fig. 3a, b the first embodiment with applied bonding paste in a side view (3a) and a perspective view (3b); Fig. 4a, b the first embodiment from Fig. 3a, b with an embodiment of a provided complementary counterpart in a side view (4a) and a perspective view (4b); Fig. 5a, b the first embodiment from Fig. 4a, b with aligned and arranged counterpart on the multilayer flat ribbon cable in a side view (5a) and a perspective view (5b); Fig. 6a, b the first embodiment from Fig. 5a, b with connected counterpart in a side view (6a) and a perspective view (6b); Fig. 7a, b an embodiment of an applied bonding paste on an exposed conductor section in a top view (7a) and a side view (7b); Fig. 7c, d an embodiment of the applied bonding paste on the exposed conductor section made of Fig. 7a, b after arranging the counterpart on the multilayer flat ribbon cable in a top view (7c) and in a side view (7d); and Fig. 8 a perspective view of a second embodiment of the multilayer flat ribbon cable.

[0021] Preferred embodiments are described in detail below with reference to the accompanying figures.

[0022] Fig. 1 and Fig. Figure 2 shows an embodiment of a multilayer flat ribbon cable 1 for transmitting electrical signals. The multilayer flat ribbon cable 1 comprises, as its base body, an insulation 2 that extends flat along a first direction X. The insulation 2 is preferably made of a plastic. In particular, the insulation 2 is flexible and can be easily deformed elastically, for example, bent. Due to the flexibility of the insulation 2, the multilayer flat ribbon cable 1 can be easily and simply routed, for example, along a vehicle body in the automotive sector.

[0023] The multilayer flat ribbon cable 1 further comprises a plurality of conductors 4 for transmitting electrical signals. The conductors 4 are arranged in a matrix configuration within the insulation 2 and extend along the first direction X within the insulation 2. The matrix configuration is important so that the multilayer flat ribbon cable 1 can be divided into individual layers L. The conductors 4, which are spaced apart along a second direction Y, transverse to the first direction X, together with an adjacent insulation layer 3 of a predetermined first height H1, along a third direction Z, transverse to the first and second directions X, Y, form a layer L. The matrix configuration also includes embodiments in which, for individual layers L, the conductors 4 of a layer L are connected to each other, preferably continuously, and form a planar conductor 4 (see Figure 1). Fig. 1 and Fig. 3a, first and third layer L1, L3).

[0024] The multilayer flat ribbon cable 1 further comprises at least one end section 11 for contacting a complementary counterpart 101. The at least one end section 11 has a stepped shape. Each step S comprises the respective insulation layer 3, at least one exposed conductor section 5, and at least one terrace section 6, which does not have a conductor section 5, of a layer L. An exposed conductor section 5 is preferably formed by a conductor 4 being freed from the insulation 2 on at least one side, which does not comprise the end face of the multilayer flat ribbon cable 1, and being open to the outside. Preferably, and as in Fig. As can be seen in Figure 2, in each stage S, at least one exposed conductor section 5 rests on the insulating layer 3 of layer L. In particular, the exposed conductor section 5 is connected to its insulating layer 3, which lies below it in the third direction Z. Through this connection to the insulating layer 3, the exposed conductor sections 5 are firmly fixed to the insulation 2. The conductors 4 and exposed conductor sections 5 are so thin that they do not, or at least not significantly, impair the flexibility of the multilayer flat ribbon cable 1. The conductors 4 of each layer L have a second height H2, and in each layer L, the first height H1 of the insulating layer 3 is preferably greater than the second height H2 of the conductors 4. In a preferred embodiment, the first height H1 is at least twice the second height H2 (see Figure 2). Fig. 2).

[0025] In the Fig. In the embodiment shown in Figure 2, the exposed conductor sections 5 and the terrace sections 6 of a layer L extend into a first and a second section A1, A2. The illustrated first and second sections A1, A2 are of equal length along the first direction X. In alternative embodiments, the first and second sections A1, A2 may have different lengths. It is important that in at least one layer L, preferably in every layer L, there is a terrace section 6 between an exposed conductor section 5 and an edge K, leading to the next stage S. The edge K is defined as the edge that is arranged along the first direction X on the side facing away from the respective conductor 4 or exposed conductor section 5 of a layer (see Figure 2). Fig. 2) The exposed conductor sections 5 serve as an (electrical) contact area to the complementary counterpart 101 or its exposed conductor sections 5 (see Fig. 4a).

[0026] In one embodiment, the multilayer flat ribbon cable 1 has at least two layers L1, L2. These two layers L1, L2 allow for the implementation of two unshielded (signal line) layers for data transmission. In the case of a shielded flat ribbon cable 1, at least three layers L1, L2, L3 are required. In a preferred embodiment, the multilayer flat ribbon cable 1 has at least three layers L1, L2, L3 (see figure). Fig. 3a). The third layer L3 shown is again covered by an insulating layer 3 with a first thickness D1 to protect the conductor 4 of the third layer L3 from the outside (above in Fig. 3a) to insulate. The first thickness D1 can differ from the first height H1. The first, second, and third layers L1, L2, L3 do not necessarily have to be identical in structure. In particular, the first, second, and third layers L1, L2, L3 do not necessarily have to have the same first and second heights H1, H2. With different conductor thicknesses / cross-sections in individual layers L1, L2, L3, different heights H1, H2 may be present or appropriate. It is important that the heights H1, H2 in the individual layers L1, L2, L3 correspond to the heights H1, H2 of the layers L1, L2, L3 of the complementary counterpart 101. The first, second, and third layers L1, L2, L3 accordingly form the first, second, and third stages S1, S2, S3. In the illustrated embodiment, the conductors 4 of the first and third layers L1, L3 are continuously connected to each other. The ladders 4 of the first and third layers L1, L3 can serve as outer ladders in relation to ladders 4 of the second layer L2.In particular, the conductors 4 of the first and third layers L1 and L3, together with the outer conductors 4 of the second layer L2, can shield the inner conductors 4 of the second layer L2. Such a shielded multilayer flat ribbon cable 1 would be suitable for transmitting high-frequency electrical signals. The transmission of electrical (high-frequency) signals can take place via all inner conductors 4 of the second layer L2, or only via individual inner conductors 4, with the other inner conductors 4 of the second layer L2 then serving as further shielding between the conductors 4 for signal transmission.

[0027] In a second embodiment, which is described in Fig. As shown in Figure 8, the multilayer flat ribbon cable 102 further comprises a terminating step 12 that does not include an exposed conductor section 5. The terminating step 12 is preferably incorporated into the insulating layer 3 with the first thickness D1. Furthermore, the second embodiment of the multilayer flat ribbon cable 102 has at least two limits 14 formed on the at least one end section 11. The limits 14 are formed as projections, such that the end section 11 does not have a stepped shape in the areas of the limits 14. The terminating step 12 and / or the at least two limits 14 serve as a stop for the complementary counterpart 101 during connection. In an alternative embodiment, the multilayer flat ribbon cable 102 can have a V-shape instead of the at least two limits 14.

[0028] The following refers to the Fig. Figures 1 to 7d describe a preferred embodiment of a connection method for connecting a multilayer flat ribbon cable 1 to a complementary counterpart 101. The multilayer flat ribbon cable 1 has at least one insulation layer 2 and a plurality of conductors 4 arranged in the insulation layer 2 in a matrix configuration. The conductors 4, spaced apart along one direction, together with an adjacent insulation layer 3 of a predetermined first height H1, form a layer L. The multilayer flat ribbon cable 1 further has at least one end section 11 for contacting the complementary counterpart 101. The at least one end section 11 has a stepped configuration, and each step S comprises the respective insulation layer 3, at least one exposed conductor section 5, and a terraced section 6, which does not have a conductor section 5, of a layer L.The connection procedure includes at least the following steps: providing the multilayer flat ribbon cable 1 and aligning it along a first direction X (see . . Fig. 1 and Fig. 2) Then a bonding paste 7 is applied to at least one exposed conductor section 5 (see below). Fig. 3a and Fig. 3b). In a preferred embodiment, the joining paste 7 comprises a solder paste that is applied in the form of a hemisphere with a predetermined radius R. The radius R preferably corresponds to half the length of the first section A1 of an exposed conductor section (see Figure 3b). Fig. 7a). Due to surface tension, the soldering / joining paste 7 forms in the shape of a hemisphere with radius R (see. Fig. 7b).

[0029] The complementary counterpart 101 is then aligned and positioned on the end section 11 so that at least one terrace section 6 of the multilayer flat ribbon cable 1 and the complementary counterpart 101 are in contact. The bonding paste 7 forms an adhesive bond 7a between the at least one exposed conductor section 5 of the multilayer flat ribbon cable 1 and an opposing exposed conductor section 5 of the complementary counterpart 101 (see figure). Fig. 4a to 5b). In particular, the counter-pressure of the complementary counterpart 101, when placed on the multilayer flat ribbon cable 1, compresses the bonding paste 7 until the bonding paste 7 essentially forms a rectangular column, so as not to be forced over the exposed conductor section 5 (i.e., contact). In a preferred embodiment, the stepped shape creates a second thickness D between the exposed conductor sections 5 of the multilayer flat ribbon cable 1 and the complementary counterpart 101, which is in the range of approximately 60–90% of the radius R. The alignment can be automated, for example, by means of grippers that grasp the multilayer flat ribbon cable 1 and / or the complementary counterpart 101 and move them towards each other ( Fig. 4a and Fig. 4b). Alignment can be supported by the final stage 12 and / or the at least two limits 14, which serve as stops. Reliable alignment can be automated using haptic and / or optical sensors. The subsequent arrangement or joining can be carried out, for example, using flat joining dies. The joining dies preferably press against each other perpendicularly, thereby pressing the multilayer flat ribbon cable 1 and the complementary counterpart 101 together in the end section 11. The adhesive connection 7a formed by the joining establishes an electrical connection between the exposed conductor sections 5 of the multilayer flat ribbon cable 1 and the complementary counterpart 101. However, the adhesive connection 7a is still detachable and does not ensure a sufficient mechanical connection.

[0030] In a final step, the multilayer flat ribbon cable 1 is joined to its complementary counterpart 101, creating a permanent mechanical and electrical connection 7b via the bonding paste 7. In a preferred embodiment, the joining is achieved by heating and / or curing the bonding paste 7. In the case of solder paste, the joining is achieved by soldering. When applying heat or during soldering, it is ensured that the processing temperature of the solder paste is below the temperature range in which the insulation (i.e., the insulating plastic) loses its properties, such as glass transition temperature, melting temperature, thermal decomposition, stresses due to differential thermal expansion, etc. In alternative embodiments, other joining methods can be used, for example, heat to cure the bonding paste 7.The amount of bonding paste 7 is adapted to the distance between the exposed conductor sections 5 of the multilayer flat ribbon cable 1 and the complementary counterpart 101. In particular, the radius R of the hemisphere of the bonding paste 7 is initially larger than the second thickness D2 between the exposed conductor sections of the multilayer flat ribbon cable 1 and the complementary counterpart 101, so that a reliable adhesive bond 7a is formed (see . . Fig. 5a and Fig. 5b). However, the amount of joining paste 7 is not squeezed beyond the exposed conductor section 5 during joining, but is essentially distributed over an area (square or elongated) of the exposed conductor section 5 and spreads there over a thickness D to form the permanent connection 7b (see. Fig. 7c and Fig.7d). The amount of solder paste 7 is insufficient for a given step shape to prevent accidental squeezing up to an adjacent exposed conductor section 5 of the same layer L. Depending on the choice of solder / connecting paste, insulation, connection method, and contact area size (on the exposed conductor sections 5), different layer thickness ratios between the first and second levels H1, H2 can occur. By maintaining the distances or thickness D between the exposed conductor sections 5 and a specific amount of solder paste 7, unwanted short circuits are avoided using simple means and a simple connection method.

[0031] The result is a connection 100 for transmitting electrical signals, wherein the connection 100 comprises at least a multilayer flat ribbon cable 1 and a complementary counterpart 101. The complementary counterpart 101 can comprise a corresponding flat ribbon cable, a connector, or a printed circuit board connection. REFERENCE MARK LIST 1 multi-layer flat ribbon cable 2 Insulation 3 Insulation layer 4 conductors 5 exposed ladder section 6 Terrace section 7. Bonding paste 7a Bonding paste as an adhesive bond 7b Compound paste as a connection 11 Final Section 12 final stage 14 limitations 100 connections 101 complementary counterpart 102 second embodiment A1 first section A2 second section Thickness D1 first thickness D2 second thickness H1 first height H2 second height K edge L location L1 first layer L2 second layer L3 third layer R radius S level S1 first stage S2 second stage S3 third stage X first direction Y second direction Z third direction

Claims

[1] Multilayer flat ribbon cable (1) comprising: a. an insulation (2) which extends flat along a first direction (X); b. a plurality of conductors (4) arranged in a matrix form in the insulation (2) and extending along the first direction (X) in the insulation (2), wherein conductors (4) spaced apart along a second direction (Y), transverse to the first direction (X), form a layer (L) with an adjacent insulation layer (3) of a predetermined first height (H1), along a third direction (Z), transverse to the first and second directions (X, Y); and c. at least one end section (11) for contacting a complementary counterpart (101), wherein the at least one end section (11) has a step shape and each step (S) comprises the respective insulation layer (3), at least one exposed conductor section (5) and at least one terrace section (6) which does not have a conductor section (5), of a layer (L). [2] Multilayer flat ribbon cable according to claim 1, wherein in each stage (S) the at least one exposed conductor section (5) rests on the insulation layer (3) of the layer (L). [3] Multilayer flat ribbon cable according to claim 1 or 2, wherein the conductors (4) of each layer (L) have a second height (H2) and in each layer (L) the first height (H1) of the insulation layer (3) is greater than the second height (H2) of the conductors (4). [4] Multilayer flat ribbon cable according to one of claims 1-3, wherein in individual layers (L) the conductors (4) of a layer (L) are connected to each other, preferably continuously. [5] Multilayer flat ribbon cable according to one of claims 1-4, wherein the multilayer flat ribbon cable (1) has at least a first, second and third layer (L1, L2, L3). [6] Multilayer flat ribbon cable according to one of claims 1-5, further comprising a termination stage (12) which does not have an exposed conductor section (5). [7] Multilayer flat ribbon cable according to one of claims 1-6, further comprising at least two boundaries (14) formed on the at least one end section (11) in which the end section (11) does not have a step shape. [8] Interconnection method for connecting a multilayer flat ribbon cable (1) to a complementary counterpart (101), wherein the multilayer flat ribbon cable (1) comprises at least: an insulation (2), a plurality of conductors (4) arranged in the insulation (2) in a matrix form, wherein conductors (4) spaced apart along a direction form a layer (L) with an adjacent insulation layer (3) of a predetermined first height (H1), and at least one end section (11) for contacting the complementary counterpart (101), wherein the at least one end section (11) has a step form, and each step (S) comprises the respective insulation layer (3), at least one exposed conductor section (5), and a terrace section (6) not comprising a conductor section (5), of a layer (L), wherein the method comprises the following steps: a. Providing the multilayer flat ribbon cable (1) and aligning it along a first direction (X); b. Applying a bonding paste (7) to the at least one exposed conductor section (5); c. Aligning and arranging the complementary counterpart (101) on the end section (11) such that at least one terrace section (6) of the multilayer flat ribbon cable (1) and the complementary counterpart (101) are adjacent and the bonding paste (7) forms an adhesive bond (7a) between the at least one exposed conductor section (5) of the multilayer flat ribbon cable (1) and an opposing exposed conductor section (5) of the complementary counterpart (101); and d. Connecting the multilayer flat ribbon cable (1) to the complementary counterpart (101) so that a permanent mechanical and electrical connection (7b) is created via the connecting paste (7). [9] Method according to claim 8, wherein the bonding paste (7) comprises a solder paste which is applied in the form of a hemisphere with a predetermined radius (R). [10] Method according to claim 8 or 9, wherein step d. comprises: Heating and / or curing the bonding paste (7). [11] Connection (100) for transmitting electrical signals, wherein the connection (100) has at least: a. a multilayer flat ribbon cable (1) according to any one of claims 1-7; and b. a complementary counterpart (101), wherein the complementary counterpart (101) comprises a corresponding ribbon cable, connector or printed circuit board connector.

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