DE102014102532B4 - Impedance matching system and contacting system with such an impedance matching system - Google Patents

Abstract

Impedance matching system (10) - with at least one shield (15) and at least one signal line (20), - the signal line (20) having a first cable (21) and a second cable (22), - the first cable (21) is twisted with the second cable (21) in a first section (45) of the signal line (20),- the shielding (15) being at least partially arranged in a second section (50) of the signal line (20) and the cables (21 , 22) are arranged untwisted,- the shielding (15) having a shielding wall (55) at least partially surrounding the signal line (20) on the peripheral side,- the shielding (15) having at least one recess (60, 120, 135, 165), - wherein the recess (60, 120, 135, 165) is arranged in the shielding wall (55), - characterized in that- the recess (60, 120, 135, 165) and the shielding wall (55) are matched to one another in such a way, that a transition between the first section (45) and the second n section (50) has a predefined impedance profile, - wherein the shield (15) has metamaterial.

Description

The invention relates to an impedance matching system according to patent claim 1 and a contacting system with such an impedance matching system according to patent claim 12.

From the generic JP 2004 - 71 404 A a contacting system for twisted pair cables is known. The twisted pair cable has a first section in which individual cables are spirally wound around one another, and a second section in which the cables of the twisted pair cable are routed separately from one another. The second section ends in a housing. Furthermore, a holding system is provided in the second section in order to provide parallel routing of the cables in the second section between the first section and the contact housing. By twisting the two cables around one another, an impedance in the twisted pair cable is kept essentially constant via the twisted section. the end US 2008/0 029 299 A1 , DE 24 18 780 A and U.S. 5,414,211 A cables are known.

It is the object of the invention to provide an improved impedance matching system and an improved contacting system.

This object is achieved by means of a shielding system according to patent claim 1. Advantageous embodiments are specified in the dependent claims.

According to the invention, it was recognized that an improved impedance matching system can be provided in that the impedance matching system has at least one shield and at least one signal line. The signal line includes a first cable and a second cable. The first cable is twisted with the second cable in a first section of the signal line. The shielding is at least partially arranged in a second section of the signal line and the cables are arranged without twisting. The shielding comprises a shielding wall that encloses the signal line at least partially on the circumference. Furthermore, the shielding has at least one recess, the recess being arranged in the shielding wall. The recess and the shielding wall are matched to one another in such a way that a transition between the first section and the second section has a predefined impedance curve and the shielding has metamaterial.

This configuration has the advantage that signal transmission via the signal line is improved and disruptive influences, especially in the area of a connection of the signal line, i.e. when the cable of the signal line in particular has to be routed untwisted, the impedance in this area does not suddenly increase and lead to a deterioration in signal transmission.

In a further embodiment, the shielding has a first end face facing the first section of the signal line and a second end face remote from the first section, the recess having a different width from the first end face in the direction of the second end face. As a result, an impedance can be flexibly adapted particularly precisely to a routing of the cable of the signal line.

It is particularly advantageous here if the recess tapers from the first end face in the direction of the second end face.

In a further embodiment, there are at least three recesses, the recesses being arranged in the shielding wall in a regular pattern and/or at a constant distance from one another. This configuration is particularly easy to produce.

In a further embodiment, the recess is completely surrounded by a material of the shielding wall. In this way, a particularly cost-effective shielding can be provided that is particularly tear-resistant and therefore favorable in terms of manufacturing technology for the production of shielding systems.

In a further embodiment, the shielding wall has a first wall section and a second wall section. The first wall section preferably faces the first section of the signal line. In the first wall section, there are a plurality of recesses in the first wall section and the second wall section. A first distribution density of the recess in the first wall section is different from a second distribution density of the recess in the second wall section. This configuration can also be used to avoid an impedance jump in the characteristic impedance in the signal line in a simple manner due to the shielding system. Additionally or alternatively, a number of recesses in the first wall section is larger than a number of recesses in the second wall section.

In a further embodiment, the recess has a circular cross section or an elliptical cross section or a rectangular cross section or a triangular cross section. These configurations have turned out to be particularly simple and inexpensive for the production of stamping tools for producing the recesses in the shielding wall.

It is also particularly advantageous if the shielding has at least one of the following materials: electrically conductive materials, aluminum, copper, electrically conductive plastic, ferrite, ferrite-filled plastic, sintered ferrite, film-like material, metamaterial, liquid/powder coating material, material with a Permittivity ε _r greater than 1, preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 5, in particular greater than 10, material with a permittivity ε _r less than 1, in particular with a negative permittivity ε _r , material with a magnetic permeability μ greater than 1.3, preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 10, in particular greater than 100, material with a permeability μ _r less than 1, in particular with a negative permeability μ _r , permittivity.

In a further embodiment, the shielding is foil-like. This refinement has the advantage that the shielding can be routed around the second section of the signal line in a particularly simple manner by means of a winding process, and a precisely defined impedance matching system can thus be provided in a particularly cost-effective manner.

In a further embodiment, each cable has an electrical conductor, with an electrical signal having a wavelength being able to be transmitted by means of the electrical conductor, with the recess having a recess contour with a circumferential length, with a value of the circumferential length of the recess contour being at least less than a fraction of the Wavelength, preferably a value less than one tenth of the wavelength. This prevents electromagnetic fields from being radiated in or out through the openings, which would impair the effectiveness of the shielding.

It is particularly advantageous if the circumferential length is less than 150 mm, preferably less than 30 mm. These circumferential lengths ensure that the effects described above do not occur with signals having a frequency of 100 MHz.

However, the task is also solved by a contacting system according to patent claim 12 . Advantageous embodiments are specified in the dependent claims.

According to the invention, it was recognized that an improved contacting system with an impedance matching system can be provided in that the impedance matching system is designed as described above and a contacting device is provided. The contacting device is designed to provide an electrical contact to a further electrical component. The shield at least partially surrounds the contacting device. This ensures that an impedance jump in the second section of the signal line can be avoided and that improved signal transmission can be provided by the signal line and the contacting system.

In a further embodiment, the contacting device comprises at least two contact elements and a housing, with one contact element being fastened to one end of an electrical conductor of the cable. The contact elements are arranged in the housing. The shielding is arranged between the contact elements and the housing or at least partially on the circumference of the housing. This ensures that the shield cannot be accidentally removed.

The properties, features and advantages of this invention described above, and the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the exemplary embodiments, which are explained in more detail in connection with the drawings.

The invention is explained in more detail below with reference to figures.

• 1 eine schematische Seitenansicht eines Impedanzanpassungssystems;
• 2 eine Schnittansicht durch das in 1 gezeigte Impedanzanpassungssystem entlang einer in 1 gezeigten Schnittebene A-A;
• 3 eine Schnittansicht durch das in 1 gezeigte Impedanzanpassungssystem entlang einer in 1 gezeigten Schnittebene B-B;
• 4 ein Diagramm einer Impedanz, aufgetragen auf einer Länge zu dem in 1 gezeigten Impedanzanpassungssystem;
• 5 eine Abwicklung einer in 1 bis 3 gezeigten Abschirmung gemäß einer ersten Ausführungsform;
• 6 eine Abwicklung einer Abschirmung gemäß einer zweiten Ausführungsform;
• 7 eine Abwicklung einer Abschirmung gemäß einer dritten Ausführungsform;
• 8 eine Abwicklung einer Abschirmung gemäß einer vierten Ausführungsform,
• 9 eine Abwicklung einer Abschirmung gemäß einer fünften Ausführungsform;
• 10 eine Abwicklung einer Abschirmung gemäß einer sechsten Ausführungsform;
• 11 eine Abwicklung einer Abschirmung gemäß einer siebten Ausführungsform;
• 12 eine Abwicklung einer Abschirmung gemäß einer achten Ausführungsform;
• 13 eine Schnittansicht entlang einer in 12 gezeigten Schnittebene C-C durch die in 12 gezeigte Abschirmung;
• 14 eine Seitenansicht auf ein Kontaktierungssystem mit dem in 1 bis 3 gezeigten Impedanzanpassungssystem;
• 15 eine Schnittansicht durch das in 14 gezeigte Kontaktierungssystem entlang einer in 14 gezeigten Schnittebene D-D; und
• 16 ein Diagramm einer Impedanz Z, aufgetragen über einer Längserstreckung 1 des in 14 gezeigten Kontaktierungssystems.

show:

• 1 a schematic side view of an impedance matching system;
• 2 a sectional view through the in 1 Impedance matching system shown along an in 1 shown cutting plane AA;
• 3 a sectional view through the in 1 Impedance matching system shown along an in 1 shown cutting plane BB;
• 4 a diagram of an impedance plotted on a length to the in 1 shown impedance matching system;
• 5 a settlement of an in 1 until 3 shown shield according to a first embodiment;
• 6 a development of a shield according to a second embodiment;
• 7 a development of a shield according to a third embodiment;
• 8th a development of a shield according to a fourth embodiment,
• 9 a development of a shield according to a fifth embodiment;
• 10 a development of a shield according to a sixth embodiment;
• 11 a development of a shield according to a seventh embodiment;
• 12 a development of a shield according to an eighth embodiment;
• 13 a sectional view along an in 12 shown section plane CC through the in 12 shield shown;
• 14 a side view of a contacting system with the in 1 until 3 shown impedance matching system;
• 15 a sectional view through the in 14 shown contacting system along an in 14 shown cutting plane DD; and
• 16 a diagram of an impedance Z plotted against a longitudinal extension 1 of the in 14 shown contacting system.

1 shows a schematic side view of an impedance matching system 10. 2 shows a sectional view through the in 1 Impedance matching system 10 shown along an in 1 shown cutting plane AA and 3 shows a sectional view through the in 1 Impedance matching system 10 shown along an in 1 shown cutting plane BB. The following should 1 until 3 be explained together.

The impedance matching system 10 has a shield 15 and a signal line 20 . The signal line 20 has a first cable 21 and a second cable 22 . The first cable 21 has a first electrical conductor 25 and a first insulator 30 . The first insulator 30 is arranged on the circumference of the first electrical conductor 25 and electrically insulates the electrical conductor 25 from the environment. The second cable 22 has a second electrical conductor 35 which is electrically insulated from the environment on the peripheral side by a second insulator 40 of the second cable 22 . The signal line 20 is used for high-frequency transmission of signals.

The signal line 20 has a first section 45 and a second section 50 . The first section 45 is in this case, for example 1 arranged on the right side of the second section 50 . In the first section 45 the signal line 20 is in the form of a twisted pair cable, so that the first cable 21 is twisted with the second cable 22 . In the second section 50, the first cable 21 is routed to the second cable 22 at a distance d and untwisted. This routing can be necessary, for example, when the first cable 21 and the second cable 22 are routed into a contacting system 200 in order to obtain electrical contact, for example with a printed circuit board or other signal lines.

The shield 15 is in the second section 50, as in 2 shown, guided completely around the cables 21, 22 circumferentially. Furthermore, the shielding 15 is only partially routed around the signal line 20 in a partial section of the second section 50 adjacent to the first section 45 and thus, as in FIG 3 As shown, one side of the signal line 20 is covered by the shield 15 and the other side is uncovered by the shield 15. It is also conceivable, as in the 2 and 3 shown that this complete peripheral coverage can be combined with a partial coverage of the signal line 20 by the shield 15 in order to achieve a substantially constant impedance curve over the length 1 of the signal line 20.

Of course, it is also conceivable for the shielding 15 to only partially encompass the signal line 20 over the entire second section 50 . It is also conceivable that the shielding 15 completely surrounds the signal line 20 on the peripheral side over the entire second section 50 of the signal line 20 .

4 shows a diagram of an impedance Z plotted against a length 1 of the signal line 20.

By designing in the 1 until 3 In the shield 15 shown and shown in the various embodiments, a substantially constant impedance profile of the impedance Z over the length 1 of the signal line 20 can be provided both in the twisted first section 45 and in the spaced-apart section 50 . The shielding system 10 thus has no impedance jump at the transition between the first and the second section 45, 50. A constant impedance profile within the meaning of the application is understood to mean an impedance Z that deviates over the length 1 of the signal line 20 from a mean value of the impedance Z in the first section 45 by less than 20%, preferably less than 5%.

That in the 1 until 3 Although the shielding system 10 shown has a change at a transition between the first section 45 and the second section 50, which is in the form of a small dip 89 in the impedance profile, the dip 89 is less than 20% in relation to the mean value of the impedance Z in the first section 45, so that the impedance profile is essentially constant according to the above definition.

5 shows a development of the in 1 Shield 15 shown. Shield 15 has a shield wall 55 . The shielding wall 55 is formed like a film, for example. In this case, numerous recesses 60 are provided, which are designed as through-openings. The recesses 60 are arranged in a regular pattern and at a constant distance from one another in the shielding wall 55 . The recesses 60 are completely surrounded by a material of the shielding wall 55.

In the embodiment, the shielding wall 55 has at least one of the following materials: electrically conductive materials, aluminum, copper, electrically conductive plastic, ferrite, ferrite-filled plastic, sintered ferrite, metamaterial, liquid/powder-form coating material, material with a permittivity ε _r greater than 1 , preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 5, in particular greater than 10, material with a permittivity ε _r less than 1, in particular with a negative permittivity ε _r , material with a magnetic permeability μ of greater than 1.3, preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 10, in particular greater than 100, material with a permeability μ _r less than 1, in particular with a negative permeability μ _r , powder/powder-form coating material , film-like material.

In the embodiment, the recesses 60 are formed with a circular cross section. Of course, it is also conceivable that the recesses have an elliptical cross section, a rectangular cross section or a triangular cross section. It is also conceivable that the recesses 60 have a different geometry. Each recess 60 has a recess contour 65 . The recess contour 65 has a circumferential length l _u .

Electrical signals, in particular data signals, can be transmitted by means of the signal line 20 . The transmitted signals have a wavelength λ corresponding to the transmission frequency. In the embodiment, the signal line 20 is designed for a transmission frequency of 100 MHz. Of course, other signals that have a different signal frequency can also be transmitted with the signal line 20 . If the signal frequency is 100MHz, the wavelength of the signal is about 3m 5 To achieve the essentially constant impedance profile shown over the two sections 45, 50 of the signal line 20, the circumferential length l _u of the recess contour 65 is selected to be smaller than a value of half the wavelength of the electrical signal to be transmitted by means of the signal line 20 (l _U , < λ/2) . A value of the peripheral length of the recess contour 65 is preferably smaller than one tenth of the wavelength (l _u <λ/10) to be transmitted with the signal line 20 .

As a result, when transmitting an electrical signal with a signal frequency of 100 MHz, it is particularly advantageous if the circumferential length l _u has a value that is less than 150 mm, preferably less than 30 mm.

In the embodiment, the recesses 60 are arranged in mutually parallel first rows 70, 75 (in 5 marked by dashed boxes) Further, second rows 80, 85 are formed through the recesses 60, the second rows 80, 85 (in 5 marked by dashed boxes) are arranged perpendicular to the first rows 70,75. Of course, other arrangement patterns are also conceivable.

The permittivity ε _r and/or a permability μ _r can be changed locally through the recesses 60 in order to avoid the impedance jump in the characteristic impedance between the first section 45 and the second section 50 that occurs in the prior art.

By avoiding impedance jumps at the transition from the first section 45 of the signal line 20 to the second section 50, signal reflections within the signal line can be significantly reduced 20 and thus reliable signal transmission of the electrical signals by means of the signal line 20 can be ensured.

Due to the film-like design of the shielding 15, it is conceivable that the shielding 15 can be provided with an adhesive layer 90 (cf. 2 ) so as to reliably fix the shield 15 to the signal line 20. This also allows a self-adhesive shield 15 to be provided. It is also conceivable for the shielding 15 to be routed multiple times in different layers around the signal line 20 in the second section 50, for example as a coil.

6 shows a development of the shield 15 according to a second embodiment. The shield 15 is essentially identical to that in FIG 5 embodiment shown formed. Deviating from this, the shielding 15 has a first wall section 95 and a second wall section 100 . The first wall section 95 is on a first section 45 arranged on the side facing away from the signal line 20 . In the first wall section 95 and in the second wall section 100 are already in the 6 Recesses 60 shown are provided. Deviating from this, in the first wall section 95 a distribution density of the recesses 60 is increased compared to a distribution density in the second wall section 100 .

This configuration has the advantage that the shielding 15 can be flexibly adapted to the distance d between the cables 21, 22 in the second section 50 of the signal line 20 by means of the distribution density in the respective wall section 95, 100, in order to ensure that the impedance Z to achieve over the length 1 of the signal line 20.

In the embodiment, the first wall section 95 is arranged on a side of the second section 50 of the signal line 20 facing away from the first section 45 and the second wall section 100 is arranged on a side of the second section 50 facing the first section 45 . Due to the lower distribution density in the second wall section 100, the impedance Z is reduced less than due to the increased distribution density in the first wall section 95. As a result, the in 4 shown slump 89 avoided.

In the second wall section 100, the recesses 60 are as already shown in 5 explained arranged. Additional rows 105 are provided in the second wall section 100 between the rows 70, 75, 80, 85 already explained, so that the distribution density in the first wall section 95 is increased as a result. In the embodiment, the recesses 60 are formed identical to each other. Of course, it is also conceivable that the recesses 60 are formed differently depending on the different wall sections 95, 100.

7 shows a development of the shield 15 according to a third embodiment. The shield 15 is essentially similar to that in FIG 6 configuration shown formed. Deviating from this, a third wall section 110 and a fourth wall section 115 are provided in addition to the first wall section 95 and the second wall section 100 . It is opposite the in 6 The configuration shown, the second wall section 100 is narrower and is directly adjacent to the first wall section 95 . Right side borders in 8th the third wall section 110 adjoins the second wall section 100 . The fourth wall section 115 is provided on the right side of the third wall section 110 . The second wall section 100 and the third wall section 115 have the same distribution density of recesses 60 . The distribution density of the third wall section 110 is increased compared to the second wall section 100 or the fourth wall section 115. However, the third wall section 110 also has a lower distribution density than the first wall section 95.

The third wall section 110 and the fourth wall section 115 have a design that is essentially identical to the second wall section 100 with regard to the arrangement of the recess in a row. In these two wall sections 110, 115, too, the recesses are arranged essentially parallel and orthogonally to one another in rows 70, 75.

This configuration has the advantage that the shielding 15 can be flexibly adapted to a cable routing of the signal lines 20 in the second section 50 in order to keep an impedance of the signal line 20 essentially constant across the impedance matching system 10 .

Also in the 7 In the embodiment shown, the recesses 60 are essentially arranged identically to one another in the wall sections 95, 100, 110, 115. This has the advantage that the recesses 60 can be introduced into the shielding wall 55 in a particularly cost-effective manner in terms of production technology.

8th 12 shows a development of the shield 15 according to a fourth embodiment. The shield 15 is essentially identical to that in FIG 6 configuration shown formed. Deviating from this, the recesses 60 are essentially arranged in diagonal rows 70, 75 (in 8th marked with dashed lines). as well as in 6 the recesses 60 are arranged identically to one another in the shielding wall 55 . Of course, it is also conceivable that the recesses 60 are arranged differently and, for example, at irregular distances from one another.

9 12 shows a shield 15 according to a fifth embodiment. The shield 15 already has, as in the 5 until 8th explained, the shielding wall 55 on. A plurality of recesses 120 are provided in the shielding wall 55, which are essentially wedge-shaped and triangular in plan view. The shielding 15 has a first end face 125 facing the first section 45 . The first face 125 is in 10 arranged on the left. A second end face 130 is provided opposite the first end face 125 and is on a side facing away from the first section 45 of the shield 15 is arranged. The recess 120 extends from the first end face 125 in the direction of the second end face 130. Due to its wedge-shaped configuration, the recess 120 tapers from the first end face 125 towards the second end face 130. The recess 120 extends over the entire longitudinal extension between the first end face 120 to the second end face 130. Of course, it is also conceivable for the recess 120 to have a shorter extent, so that the recess 120 ends on the left side of the second end face 130 and a section is provided in the shielding wall 55 in which no recess 120 runs.

Of course, it is also conceivable for the recess 120 to taper starting from the second end face 130 in the direction of the first end face 125 .

In the 9 The configuration shown has the advantage that the constant increase in a cross section of the shielding wall 55 avoids an impedance jump over the length of the impedance matching system 10 and thus in particular the spacing of the two cables 21, 22, as in 1 shown can be compensated.

10 shows a development of the shield 15 according to a sixth embodiment. The shield 15 is similar to that in 10 shown training designed. Deviating from this, the shielding 15 has a recess 135 which extends from the first end face 125 in the direction of the second end face 130 in the shielding wall 55 . The recess 135 has a wavy cross section which tapers at its end facing the second end face 130 . The cross-section changes or increases and decreases over the longitudinal extent from the first end face 125 to the second end face 130. This allows the routing of the cables 21, 22 of the signal line 20 in the second section 50 to be dealt with flexibly, by an essentially constant To ensure impedance Z over the entire length of the signal line 20.

On the right side of a longitudinal end of the recess 135, a wall section 140 is provided in the shielding wall 55, in which no recesses are provided. Of course, it is also conceivable that the section 140 is omitted and the recesses 135, as in 10 shown, extend over the entire longitudinal extent of the shield 15.

11 shows a development of the shield 15 according to a seventh embodiment. The shield 15 is similar to that in 10 shown embodiment of the shield 15 is formed. Deviating from this, the shielding 15 has a first section 145 which is arranged adjacent to the first end face 125 . Furthermore, a second section 150 is provided on the second end face 130 . A middle section 155 is arranged between the first section 145 and the second section 150 . In the first section 145 and in the second section 150, the already in 10 explained recesses 120 are provided, wherein the recesses 120 have a shorter longitudinal extent. The recesses 120 extend in the first section 145 from the first end face 125 in the direction of the central section 155. The first recesses 120 end at the central section 155. No recesses 120 are provided in the central section 155 itself. However, the recesses 120 also extend from the second end face 130 towards the middle section 155.

In the embodiment, the recesses 120 arranged on the left in the first section 145 are symmetrical to the recesses 120 arranged in the second section 150 in relation to a central axis 156 arranged in the middle section 155. Of course, it is also conceivable that an asymmetrical arrangement of the recesses 120 between the first section 145 and the second portion 150 is provided. It is also conceivable for the recesses 120 in the first section 145 to have a different longitudinal extension relative to one another or in relation to the recesses 120 in the second section 150 to have a different longitudinal extension.

12 14 shows a plan view of the shield 15 according to an eighth embodiment and 13 shows a sectional view of an in 13 shown section plane CC. The shielding 15 has a carrier layer 160, which has a film-like material, for example, which has a permittivity ε _r greater than 1, preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 5, in particular greater than 10, and /or material with a permittivity ε _r less than 1, in particular with a negative permittivity ε _r and/or material with a magnetic permeability μ of greater than 1.3, preferably greater than 1.5, in particular greater than 2, particularly advantageously greater than 10, in particular greater than 100, material with a permeability μ _r less than 1, in particular with a negative permeability μ _r . In particular, it is conceivable that the carrier layer 160 is formed from an electrically non-conductive plastic. The shielding wall 55 is formed on the upper side of the carrier layer 160 . The shielding wall 55 is, for example, vapor-deposited on the carrier layer 160 as a further layer. Of course it is too It is conceivable that the shielding wall 55, particularly if the shielding wall 55 is formed in such a way that it forms a metamaterial and/or, in addition to vapor deposition, is also printed, laser-sintered or applied in some other way to the carrier layer 160, which is preferably formed like a film.

The shielding wall 55 has the materials mentioned above. Recesses 165 are formed between the shielding walls 55 . The recesses 165 have a different length and are delimited by strips of the shielding wall 55 arranged in a logarithmic pattern.

The shielding wall 55 has different partial sections 170 which are each linear. The partial sections 170 have the same width in the longitudinal extension of the shield 15 . Of course, it is also conceivable that the partial sections 170 have a different width. However, the recesses 165 have different widths in the longitudinal direction. Of course, it is also conceivable that the recesses 165 have the same width in the longitudinal direction.

The shielding wall 55 has the same width as the recesses 165 in a direction transverse to the longitudinal extension, so that the recesses 165 extend over the full width of the carrier layer 160, so to speak. Alternatively, it is of course also conceivable that the different sections 170 of the shielding wall 55 are connected to one another in the direction of longitudinal extent and the recesses 165 are thus at least partially completely enclosed by the shielding wall 55 .

Of course, it is also conceivable that in the 5 until 12 shown configurations of the shield 15 with the in the 12 and 13 Structure of the shield with respect to the carrier layer 160 and the recesses 165 are combined.

14 shows a schematic side view of a contacting system 200. 15 shows a sectional view through the in 14 Contacting system 200 shown along an in 15 shown cutting plane DD.

The contacting system 200 has a socket unit 205 designed as a first contacting device and a plug unit 210 designed as a second contacting device. The socket unit 205 is connected to a first signal line 215 . The connector unit 210 is connected to a second signal line 220 . The signal lines 215, 220 are corresponding to the in 1 signal line 20 shown is formed.

The socket unit 205 comprises a plurality of socket elements 225 designed as a contact element, each socket element being connected to one end of the cable 21, 22 or of the electrical conductor 25, 35 of the first signal line 215 arranged in the cable 21, 22. Furthermore, the socket unit 205 includes a socket housing 230 in which the two socket elements 225 are arranged.

The connector unit 210 has a connector housing 235, which in 14 is arranged on the left side of the socket housing 230 . Plug-in elements 240 designed as contact elements are provided in the plug housing 235 and are connected to one longitudinal end of the cable 21 , 22 of the second signal line 220 or of the electrical conductor 25 , 35 arranged in the cable 21 , 22 . In the assembled state, the plug elements 240 engage in the socket elements 225 and are received by the socket elements 225 . This provides an electrical connection between the plug-in element 240 and the socket element 225 or between the first signal line 215 and the second signal line 220 .

To, as noted in the 1 until 13 explained, to avoid an impedance jump in the contacting system 200, the shielding 15 is also provided. The shield 15 extends, for example, between the second section 50 of the first signal line 215 and the second section 50 of the second signal line 220. The shield 15 is, as in FIGS 1 until 13 explained, designed as an example.

The socket housing 230 has a circular cross section, for example. Of course, any other desired cross sections are also conceivable. The shielding 15 is arranged on the inside of the socket housing 230 and shields the socket elements 225 or the plug-in elements 240 engaging in the socket elements 225 from an environment 245 . The shielding 15 can, for example, be vapour-deposited within the socket housing 230 , printed on or applied in some other way to an electrically non-conductive material of the socket housing 230 .

In the embodiment, the female housing 230 further extends in the longitudinal direction the entire second section 50 of the first signal line 215. Of course, it is also conceivable that the shielding 15 is designed in two parts and is arranged, for example, in the area of the socket housing 230 on the socket housing 230 and is formed like a film in the area of the second section 50 and around the second section 50 of the first signal line 215 is routed.

Of course, it is also conceivable for the shielding 15 to be arranged on the outside of the socket housing 230 on the peripheral side.

It is pointed out that what has been described for the socket housing 230 in connection with the shield 15 also applies to the plug housing 235 and the shield 15 arranged on the plug housing 235 . It is also conceivable that after connecting the socket unit 205 to the plug unit 210, the shielding 15 is brought over the socket unit 205 and the plug unit 210 and at the same time the second sections 50 of the signal lines 215, 220 are also shielded from the environment 245.

16 shows a diagram of an impedance Z plotted against the length 1 of the in 14 and 15 shown contacting system 200. The arrangement of the impedance matching system 10 both in the area of the non-coiled cables 21, 22 and the contacting system 200, the impedance Z over the length 1 is also kept essentially constant in the area of the contacting system 200.

As a result, improved signal transmission between the two signal lines 215, 220 can be provided and crosstalk can be minimized. Due to the improved signal transmission, the line lengths of the signal lines 215, 220 can be lengthened overall and/or the number of contacting systems 200 for transmitting signals between two points can be increased. Furthermore, the data rate can also be increased due to the improved signal transmission.

The shielding 15 is usually matched in terms of its impedance essentially to the impedance of the signal line 20 , 215 , 220 . Of course, it is also conceivable that the signal line 20, 215, 220 has a different impedance than the impedance matching system 10. In particular, this has the advantage that an impedance Z of the signal line 20 can be adjusted in a simple manner via the impedance adjustment system 10 . For example, it is conceivable to continuously adapt a 50 ohm signal line to a 100 ohm signal line application by means of the shielding 15 by appropriately adapting the impedance matching system 10 . This has the advantage, in particular, that in the production of cable harnesses, in particular for motor vehicles, the signal lines can be easily adapted for different applications and the number of parts can thus be reduced.

Reference List

10

cable shielding system

15

shielding

20

signal line

21

first cable

22

second cable

25

first electrical conductor

30

first insulator

35

second electrical conductor

40

second insulator

45

first section

50

second part

55

shielding wall

60

recess

65

recess contour

70

first row

75

first row

80

second row

85

second row

89

Burglary

90

adhesive layer

95

first wall section

100

second wall section

105

extra row

110

third wall section

115

fourth wall section

120

recess

125

first face

130

second face

135

recess

140

wall section

145

first section

150

second part

155

middle section

156

central axis

160

backing layer

165

recess

170

section

200

contacting system

205

jack unit

210

connector unit

215

first signal line

220

second signal line

225

socket element

230

socket housing

235

connector housing

240

plug-in elements

245

Surroundings

Claims (13)

Impedance matching system (10) - with at least one shield (15) and at least one signal line (20), - the signal line (20) having a first cable (21) and a second cable (22), - the first cable (21) is twisted with the second cable (21) in a first section (45) of the signal line (20), - the shielding (15) being at least partially arranged in a second section (50) of the signal line (20) and the cables (21 , 22) are arranged without twisting, - the shielding (15) having a shielding wall (55) at least partially surrounding the signal line (20) on the circumference, - the shielding (15) having at least one recess (60, 120, 135, 165), - wherein the recess (60, 120, 135, 165) is arranged in the shielding wall (55), - characterized in that - the recess (60, 120, 135, 165) and the shielding wall (55) are matched to one another in such a way, that a transition between the first section (45) and the second section (50) has a predefined impedance profile, - wherein the shielding (15) has metamaterial. Impedance matching system (10) according to claim 1 , characterized in that - the shielding (15) has a first end face (125) facing the first section (45) of the signal line (20) and a second end face (130) facing away from the first section (45), - the recess ( 120, 135) has a different width from the first end face (125) in the direction of the second end face (130). Impedance matching system (10) according to claim 2 , characterized in that the recess (120) tapers from the first end face (125) in the direction of the second end face (130). Impedance matching system (10) according to one of Claims 1 until 3 , characterized by at least three recesses (60, 120, 135, 165), the recesses (60, 120, 135, 165) being arranged in a regular pattern and/or at a constant distance from one another in the shielding wall (55). Impedance matching system (10) according to one of Claims 1 until 4 , characterized in that the recess (60) is completely surrounded by a material of the shielding wall (55). Impedance matching system (10) according to one of Claims 1 until 5 , characterized in that - the shielding wall (55) has a first wall section (95) and a second wall section (100, 110, 115), - wherein in the first wall section (95) and in the second wall section (100, 110, 115 ) a plurality of recesses (60) is arranged, - wherein in the first wall section (95) a first distribution density of the recesses (60) is different from a second distribution density of the recesses (60) in the second wall section (100, 110, 115), - And/or a number of recesses in the first wall section (95) is greater than a number of recesses in the second wall section (100, 110, 115). Impedance matching system (10) according to one of Claims 1 until 6 , characterized in that the recess (60) has a circular cross section or an elliptical cross section or a rectangular cross section or a triangular cross section. Impedance matching system (10) according to one of Claims 1 until 7 , characterized in that the shielding (15) has at least one of the following materials: - electrically conductive materials, - aluminum, - copper, - electrically conductive plastic, - ferrite, - ferrite-filled plastic, - sintered ferrite, - foil-like material, - liquid/powder coating material. Impedance matching system (10) according to one of Claims 1 until 8th , characterized in that the shielding (15) is formed like a film. Impedance matching system (10) according to one of Claims 1 until 9 , characterized in that each cable (21, 22) has an - electrical conductor (25, 35), by means of the electrical conductor (25, 35) an electrical signal with a wavelength (2) can be transmitted, - wherein the recess ( 60) has a recess contour (65) with a circumferential length, - a value of the circumferential length of the recess contour (65) being at least smaller than a value of half the wavelength (λ). Impedance matching system (10) according to claim 10 , characterized in that the circumferential length has a value which is less than 150 mm. Contacting system (200) with an impedance matching system (10) according to one of Claims 1 until 11 and a contacting device (205, 210), - the contacting device (205, 210) being designed to provide an electrical contact to a further electrical component, - the shielding (15) at least partially enclosing the contacting device (205, 210). Contacting system (200) after claim 12 , characterized in that the contacting device (205, 210) has at least two contact elements (225, 240) and a housing (230, 235), - one contact element (225, 240) each being at one end of an electrical conductor (25, 35 ) of the cable (21, 22) is fixed, - the contact elements (225, 240) being arranged in the housing (230, 235), - the shielding (15) between the contact element (225, 240) and the housing ( 230, 235) or at least partially on the circumference of the housing (230, 235).

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