FR3018003B1 - IMPEDANCE ADAPTATION SYSTEM AND CONTACT SYSTEM WITH SUCH AN IMPEDANCE ADAPTATION SYSTEM - Google Patents

Abstract

The invention relates to an impedance matching system and a contact system with such an adaptation system, said adaptation system comprising at least one shield 15 and at least one transmission line 20, the line 20 comprising a first cable 21 and a second cable 22, the first cable 21 being twisted with the second cable 22 on a first section 45 of the line 20, the shield 15 being at least partially arranged, and the cables 21, 22 being untwisted, on the second section 50 of the line, the shielding 15 having a shielding wall at least partially enclosing the line 20 on its periphery, the shielding 15 having at least one recess in the wall, the recess and the wall being adapted to the to one another such that a transition between the first section 45 and the second section 50 has a predefined impedance curve.

Description

Description

Impedance matching system and contact system with such an impedance matching system. The invention relates to an impedance matching system and a contact system with such an impedance matching system.

JP 2004-71404 A discloses a twisted pair cable contact system. The twisted pair cable has a first section where different cables are twisted spirally around each other, and a second section where the twisted pair cable cables are guided separately from each other. The second section ends in a box. A holding system is further provided in the second section to provide parallel guiding of the cables in the second section between the first section and the contact housing. Twisting the two cables around each other maintains a substantially constant impedance in the twisted section for the twisted pair cable. The aim of the invention is to provide an improved impedance matching system as well as an improved contact system.

This problem is solved by means of an impedance matching system - with at least one shield and at least one transmission line, - the transmission line comprising a first cable and a second cable, the first cable being twisted with the second cable on a first section of the transmission line, - the shield being at least partially disposed, and the cables being untwisted, on the second section of the transmission line, the shield having a shielding wall at least partially enveloping the transmission line on its periphery, characterized in that: - the shield has at least one recess, - the recess being formed in the shielding wall, - the recess and the shielding wall being adapted to each other. other such that a transition between the first section and the second section has a predefined impedance curve. Advantageous embodiments are set forth in dependent claims.

According to the invention, it is recognized that an improved impedance matching system can be obtained in that the impedance matching system comprises at least one shield and at least one transmission line. The transmission line includes a first cable and a second cable. The first cable is twisted with the second cable into a first section of the transmission line. The shield is at least partially disposed in a second section of the transmission line and the cable is arranged untwisted. The shield comprises a shield wall at least partially surrounding the transmission line on its periphery. The shielding further has at least one recess, said recess being formed in the shielding wall. The recess and the shield wall are adapted to each other such that a transition between the first section and the second section has a predefined impedance curve.

This configuration has the advantage that signal transmission by the transmission line is improved, and disturbing influences are avoided especially at a connection of the transmission line, ie the impedance does not occur. not abruptly jump in this zone by degrading the transmission of signals if the cables of the transmission line must in particular be guided without being twisted.

In another embodiment, the shield has a first end face opposite to the first section of the transmission line. and a second end face remote from the first section, the recess having a differentiated width from the first end face to the second end face. An impedance can thus be adapted in a flexible and particularly precise way to guiding the cables of the transmission line.

It is particularly advantageous in this case that the recess becomes thinner from the first end face to the second end face.

In another embodiment, at least three recesses are provided, said recesses being arranged in a regular pattern and / or with a constant spacing therebetween in the shielding wall. This configuration is feasible particularly easily.

In another embodiment, the recess is entirely surrounded by a material of the shielding wall. Particularly economical shielding can thus be achieved, particularly resistant to breakage and therefore technically advantageous for the manufacture of shielding systems.

In another embodiment, the shield wall includes a first wall section and a second wall section. The first wall section is preferably opposed to the first section of the transmission line. A plurality of recesses are provided in the first wall section and in the second wall section. A first density of distribution of the recesses in the first wall section is different from a second density of distribution of the recesses in the second wall section. This configuration therefore also makes it possible to prevent in a simple manner a characteristic impedance jump in the transmission line by means of the shielding system. In a complementary or alternative manner, the number of recesses in the first wall section is greater than the number of recesses in the second wall section.

In another 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 proved particularly simple and economical for the manufacture of punching tools for obtaining the recesses in the shielding wall.

It is furthermore particularly advantageous for the shielding to comprise at least one of the following materials: electrically conductive materials, aluminum, copper, electrically conductive plastics, ferrite, ferrite-laden plastic, sintered ferrite, sheet-like material, metamaterial , liquid / powder coating material, material with a permittivity sr greater than 1, preferably greater than 1.5, in particular greater than 2, advantageously greater than 5, especially greater than 10, and / or less than 1000, material with a permittivity er less than 1, in particular with a negative permittivity sr, and / or with a permittivity er greater than -1000, material with a magnetic permeability μ greater than 1.3, preferably greater than 1.5, in particular greater than 2, advantageously greater than 10, more particularly greater than 100, and / or less than 1000, material with a permeability μΓ less than 1, in particular with a permeability μΓ negative, and / or with a permeability μΓ greater than -1000.

In another embodiment, the shielding is made in sheet form. This configuration has the advantage that the shield can be guided in a particularly simple manner by winding around the second section of the transmission line, and particularly advantageously to allow a precisely defined impedance matching system.

In another embodiment, each cable comprises an electrical conductor, an electrical signal with a wavelength being transmittable by means of the electrical conductor, the recess having a recess contour with a peripheral length, a value of peripheral length of the recess contour being at least less than a fraction of the wavelength, preferably less than one-tenth of a wavelength. It is thus avoided that electromagnetic fields enter or leave through the openings by undermining the effectiveness of the shielding.

It is particularly advantageous that the peripheral length has a value less than 150 mm, preferably less than 30 mm. With these peripheral lengths, it is ensured that the aforementioned effects will not be presented for signals with a frequency of 100 MHz.

In another embodiment, the predefined impedance curve is substantially constant. Alternatively, the predefined impedance curve is ascending from a first impedance to a second impedance where the predefined impedance curve is falling from a first impedance to a second impedance, the upward slope or the downward slope being preferentially linear. or degressive or progressive or regressive.

The problem is however also solved by a contact system with an impedance matching system according to the invention and a contact device, - the contact device being designed to make an electrical contact with another electrical component, the shielding at least partially surrounding the contact device.

Advantageous embodiments are set forth in the dependent claims.

According to the invention, it is recognized that an improved contact system with an impedance matching system can be obtained in that the impedance matching system is realized as mentioned above and in that a contact is expected. The contact device is provided for making electrical contact with another electrical component. The shield then at least partially surrounds the contact device. It is thus ensured that an impedance jump will be prevented in the second section of the transmission line and that an improved signal transmission by the transmission line and the contact system will be obtained.

In another embodiment, the contact device comprises at least two contact elements and a housing, a respective contact element being attached to an end of an electrical conductor of the cable. The contact elements are arranged in the housing. The shield is disposed between the contact element and the housing or at least partially on the periphery of the housing. In this way, it is ensured that the shielding can not be removed accidentally.

The aforementioned properties, features and advantages of this invention as well as the manner of obtaining them will be explained in a more clear and understandable manner in connection with the detailed description, hereinafter of the exemplary embodiments with reference to the drawings. The invention will be described hereinafter with reference to the figures.

These represent:

Fig. 1 a schematic side view of an impedance matching system;

Fig. 2 a sectional view of the impedance matching system of Figure 1, along the sectional plane A-A of Figure 1;

Fig. 3 a sectional view of the impedance matching system of Figure 1, along the sectional plane B-B of Figure 1;

Fig. 4 a diagram of an impedance carried over a length for the impedance matching system of Figure 1;

Fig. 5 a developed projection of a shield of Figures 1 to 3 according to a first embodiment;

Fig. 6 a developed projection of a shield according to a second embodiment;

Fig. 7 a developed projection of a shield according to a third embodiment;

Fig. 8 a developed projection of a shield according to a fourth embodiment,

Fig. 9 a developed projection of a shield according to a fifth embodiment;

Fig. An expanded projection of a shield according to a sixth embodiment;

Fig. there is a developed projection of a shield according to a seventh embodiment;

Fig. 12 a developed projection of a shield according to an eighth embodiment;

Fig. 13 a sectional view of the shield of Figure 12, along the section plane C-C of Figure 12;

Fig. 14 a side view of a contact system with the impedance matching system of Figures 1 to 3;

Fig. A sectional view of the contact system of Fig. 14, along the sectional plane D-D of Fig. 14; and

Fig. 16 a diagram of an impedance Z extended over a length 1 for the contact system of FIG. 14.

FIG. 1 represents a schematic side view of an impedance matching system 10. FIG. 2 represents a sectional view of the impedance matching system 10 of FIG. 1, along the section plane AA of FIG. FIG. 1, and FIG. 3 represents a sectional view of the impedance matching system 10 of FIG. 1, along the sectional plane BB of FIG. 1. FIGS. 1 to 3 are described together below. .

The impedance matching system 10 comprises a shield 15 and a transmission line 20. The transmission 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 disposed at the periphery of the first electrical conductor 25 and electrically isolates the electrical conductor 25 from the environment. The second cable 22 has a second electrical conductor 35, which is electrically isolated on its periphery with respect to an environment, by a second insulator 40 of the second cable 22. The transmission line 20 serves for the transmission of high frequency signals.

The transmission line 20 has a first section 45 and a second section 50. In FIG. 1, by way of example, the first section 45 is disposed to the right of the second section 50. In the first section 45, the transmission line 20 is shown as a twisted-pair cable, so that the first cable 21 is twisted with the second cable 22. In the second portion 50, the first cable 21 is spaced apart by an interval d of the second cable 22 and not twisted with that -this. This guidance may in particular be required if the first cable 21 and the second cable 22 are guided in a contact system 200 to obtain an electrical contact, for example with a conductive plate or other transmission lines.

As shown in FIG. 2, the shielding 15 is completely surrounded on its periphery by the cable 21, 22 in the second section 50. The shielding 15 is furthermore only partially guided around the transmission line 20 in a partial section of FIG. the second section 50, adjacent to the first section 45 and, as shown in Figure 3, one side of the transmission line 20 is thus covered by the shield 15 and the other side is free of shielding 15. It is in the conceivable also to combine this complete peripheral coverage with a partial coverage of the transmission line 20 by the shield 15, as shown in Figures 2 and 3, to obtain a substantially constant impedance curve along the length 1 of the transmission line 20.

It is obviously also conceivable that the shield 15 only partially surrounds the transmission line 20 over the entire second section 50. It is also possible for the shield 15 to surround the entire periphery of the transmission line 20 over the entire second section 50 of the transmission line 20.

FIG. 4 represents a diagram of an impedance Z, carried on a length 1 of the transmission line 20.

The configuration of the shield 15 shown in FIGS. 1 to 3 and present in different embodiments makes it possible to obtain a substantially constant impedance curve Z over the length 1 of the transmission line 20, both in the first twisted section 45 and in section 50 at spacing. The shielding system 10 therefore has no impedance jump at the transition between the first and the second section 45, 50. By constant demand impedance curve is meant an impedance Z which differs by less than 20 %, preferably less than 5% with respect to an average value of impedance Z in the first section 45 over the length 1 of the transmission line 20.

The shielding system 10 shown in FIGS. 1 to 3 certainly has a variation in a transition between the first section 45 and the second section 50, which is provided as a slight depression 89 of the impedance curve, but this depression 89 is smaller. at 20% of the average value of the impedance Z in the first section 45, so that the impedance curve is substantially constant as defined above.

FIG. 5 represents a developed projection of the shield of FIG. 1. The shielding 15 has a shielding wall 55. The shielding wall 55 is for example made in the form of a sheet. Several recesses 60 are provided, made in the form of passage openings. The recesses 60 are arranged in a regular pattern and with a constant spacing therebetween in the shield wall 55. The recesses 60 are entirely surrounded by the material of the shield wall 55.

The shielding wall 55 has in this embodiment at least one of the following materials: electrically conductive materials, aluminum, copper, electrically conductive plastics, ferrite, ferrite-laden plastic, sintered ferrite, metamaterial, liquid coating material powder, material with a permittivity of greater than 1, preferably greater than 1.5, in particular greater than 2, advantageously greater than 5, especially greater than 10, and / or less than 1000, material with a permittivity sr of less than 1 , in particular with a negative permittivity sr, and / or with a permittivity sr greater than -1000, material with a magnetic permeability μ greater than 1.3, preferably greater than 1.5, in particular greater than 2, advantageously greater than 10 , especially greater than 100, and / or less than 1000, material with a perm μ éability less than 1, in particular with a μΓ negative permeability, and / or with a permeability greater than -1000, powder / powder coating material, material made in sheet form.

In this embodiment, the recesses 60 are made with a circular cross section. But it is obviously possible 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 another geometry. Each recess 60 has a recess contour 65. The recess contour 65 has a peripheral length lu.

Electrical signals, in particular data signals, can be transmitted by means of the transmission line 20. The transmitted signals have a wavelength λ corresponding to the transmission frequency. In this embodiment, the transmission line 20 is provided for a transmission frequency of 100 MHz. It goes without saying that signals are also transmissible by the transmission line 20 with another frequency. For a signal frequency of 100 MHz, the wavelength of the signal is about 3 m. To obtain a substantially constant impedance curve on the two sections 45, 50 of the transmission line 20, as shown in FIG. 4, the peripheral length lu of the recess contour 65 is chosen less than half a value of the length. waveform of the electrical signal to be transmitted by the transmission line 20 (lu <λ / 2). Preferably, a value of the peripheral length of the recess contour 65 is less than one-tenth of the wavelength to be transmitted by the transmission line 20 (lu <λ / 10).

For the transmission of an electrical signal with a frequency of 100 MHz, it is thus particularly advantageous that the peripheral length read has a value less than 150 mm, preferably less than 30 mm.

In this embodiment, the recesses 60 are arranged in first rows 70, 75 which extend parallel to each other (marked by boxes formed by dashed lines in FIG. 5). Second rows 80, 85 are further formed by the recesses 60, the second rows 80, 85 (marked by boxes formed by dashed lines in FIG. 5) being perpendicular to the first rows 70, 75. Other patterns of arrangement are obviously conceivable.

The recesses 60 make it possible locally to modify the permittivity er and / or a permeability μΓ, thereby avoiding the impedance jump occurring in the characteristic impedance between the first section 45 and the second section 50 in the state of the art. The avoidance of impedance jumps on the transition from the first section 45 of the transmission line 20 to the second section 50 substantially reduces the signal reflections inside the transmission line 20 and thus ensures reliable transmission of the electrical signals by means of the transmission line 20.

The sheet-like configuration of the shield 15 makes it conceivable to provide the shield 15 with a layer of glue 90 disposed internally (see Fig. 2), thereby reliably securing the shield 15 on the transmission line 20. Self-adhesive shielding may also be provided. It is also conceivable to guide the shield 15 several times, for example as a winding of different layers around the transmission line 20 in the second section 50.

Figure 6 shows a developed projection of the shield 15 according to a second embodiment. The shielding 15 is made substantially identical to the embodiment shown in FIG. 5. Unlike the latter, the shielding 15 has a first wall section 95 and a second wall section 100. wall 95 is disposed on a side remote from the first section 45 of the transmission line 20. The recesses 60 already shown in FIG. 6 are provided in the first wall section 95 and in the second wall section 100. In this figure, a distribution density of the recesses 60 in the first wall section 95 is greater than a distribution density in the second wall section 100.

This configuration has the advantage that the shield 15 can be flexibly adjusted to the gap d between the cables 21, 22 in the second section 50 of the transmission line 20 by means of the distribution density in the wall section. 95, 100 to obtain the predefined impedance curve, in particular a substantially constant curve of the impedance Z over the length 1 of the transmission line 20.

In this embodiment, the first wall section 95 is disposed on one side of the second section 50 of the transmission line 20 remote from the first section 45 and the second wall section 100 on one side of the second section 50 opposite to the first section 45. Due to the lower distribution density in the second wall section 100, the impedance Z is less reduced than the higher distribution density in the first wall section 95. The depression 89 shown in FIG. Figure 4 can thus be avoided.

In the second wall section 100, the recesses 60 are arranged as previously described with reference to FIG. 5. In the second wall section 100, additional rows 105 are provided between the rows 70, 75, 80, 85 previously described, so that the distribution density is greater in the first wall section 95. In this embodiment, the recesses 60 are provided identical to each other. But it is obviously also conceivable to make recesses 60 differently depending on the different wall sections 95, 100.

Figure 7 shows a developed projection of the shield 15 according to a third embodiment. The shield 15 is substantially identical to the configuration shown in FIG. 6. Unlike 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 95. wall section 100. Compared to the configuration shown in FIG. 6, the second wall section 100 is narrower and is directly adjacent to the first wall section 95. In FIG. 8, the third wall section 110 is adjacent to to the second wall section 100. The fourth wall section 115 is provided to the right of the third wall section 110. The second wall section 100 and the third wall 115 have the same recess distribution density 60. The density of the third wall section 110 is greater than that of the second wall section 100 and the fourth wall section 115. The third wall section 110, however, has a distribution density lower than that of the first wall section 95.

The third wall section 110 and the fourth wall section 115 have a configuration substantially identical to that of the second wall section 100 with respect to the row arrangement of the recesses. In these two wall sections 110, 115 also, the recesses are arranged in rows 70, 75 substantially parallel and orthogonal to each other.

This configuration has the advantage that the shield 15 can be flexibly adjusted on a cable guide of the transmission lines 20 in the second section 50 to maintain substantially constant an impedance of the transmission line 20 on the adapter system. impedance 10.

In the embodiment illustrated in FIG. 7 also, the recesses 60 are arranged substantially identically in the wall sections 95, 100, 110, 115. This has the advantage of allowing a particularly economical technical embodiment of the recesses 60 in the shield wall 55.

Figure 8 shows a developed projection of the shield 15 according to a fourth embodiment. The shielding 15 is substantially identical to the configuration shown in FIG. 6. Unlike the latter, the recesses 60 are arranged in rows 70, 75 with substantially diagonal extension (marked by dashed lines in FIG. 8). As in Figure 6, the recesses 60 are formed substantially identically to each other in the shield wall 55. It is obviously also conceivable to arrange differently the recesses 60, for example with irregular spacings between them.

Fig. 9 shows a shield 15 according to a fifth embodiment. The shield 15 has the shield wall 55, as previously described with reference to Figures 5 to 8. Several substantially wedge shaped recesses 120 are provided in the shield wall 55, which are triangular in plan view. The shield 15 has a first end face 125 opposite the first section 45. The first end face 125 is located on the left side of FIG. 10. A second end face 130 opposite the first end face 125 is provided which is arranged on the side of the shield 15 remote from the first section 45. The recess 120 extends from the first end face 125 to the second end face 130. Because of its wedge conformation, the recess 120 tapers from the first end face 125 to the second end face 130. The recess 120 extends over the entire length between the first end face 120 and the second end face 130. It is of course also conceivable that the recess 120 has a smaller extension. such that the recess 120 terminates on the left of the second end face 130 and a recess extension-free section 120 is provided in the shield wall 55.

It is also conceivable that the recess 120 becomes thinner from the second end face 130 towards the first end face 125.

The configuration of FIG. 9 has the advantage that the continuous increase of a cross section of the shielding wall 55 makes it possible to avoid an impedance jump over the length of the impedance matching system 10 and that the The spacing of the two cables 21, 22 can thus be compensated in particular, as shown in FIG.

Figure 10 shows a developed projection of the shield 15 according to a sixth embodiment. The shielding 15 is made similarly to the configuration shown in FIG. 10. Unlike the latter, the shielding 15 has a recess 135 which extends from the first end face 125 to the second end face 130 in the wall The recess 135 has a wavy cross-section which generally tapers at its opposite end to the second end face 130. The cross section varies, and increases and decreases along the length of the first end face 125 to the second end face. 130. The guiding of the cables 21, 22 of the transmission line 20 can thus be flexibly adjusted in the second section 50, to ensure a substantially constant impedance Z over the entire length of the transmission line 20. a longitudinal section of the recess 135 is provided with a wall section 140 in the shield wall 55, where no recesses are formed. It is of course also conceivable to give up the section 140 and to extend the recesses 135 over the entire length of the shield 15, as shown in FIG.

Fig. 11 shows a developed projection of the shield 15 according to a seventh embodiment. The shield 15 is made similar to the shielding configuration 15 shown in FIG. 10. Unlike this, the shield 15 has a first section 145 adjacent to the first end face 125. A second section 150 is furthermore provided. provided on the second end face 130. A central section 155 is disposed between the first section 145 and the second section 150. The recesses 120 previously described with reference to Figure 10 are provided in the first section 145 and the second section 150, said recesses 120 having a shorter length. The recesses 120 extend in this case in the first section 145 of the first end face 125 to the central section 155. The first recesses 120 end in the central section 155. No recess 120 is provided in the central section 155 herself. But the recesses 120 also extend from the second end face 130 to the central section 155.

In this embodiment, the recesses 120 located on the left in the first section 145 are symmetrical with the recesses 120 formed in the second section 150 with respect to a median axis 156 passing through the central section 155. It is obviously also conceivable that a Non-symmetrical arrangement of the recesses 120 is provided between the first section 145 and the second section 150. It is also conceivable that the recesses 120 have lengths different from each other in the first section 145 or different lengths relative to the recesses 120 in the second section. section 150.

FIG. 12 is a top view of the shield 15 according to an eighth embodiment and FIG. 13 is a sectional view along the section plane CC of FIG. 13. The shielding 15 is provided with a support layer 160 presenting for example a material made in sheet form, with a permittivity εΓ greater than 1, preferably greater than 1.5, in particular greater than 2, advantageously greater than 5, especially greater than 10, and / or a material with a permittivity εΓ less than 1, in particular with a negative εΓ permittivity and / or a material with a magnetic permeability μ greater than 1.3, preferably greater than 1.5, in particular greater than 2, advantageously greater than 10, more particularly greater than 100, a material with a permeability pr less than 1, in particular with a μΓ negative permeability. It is particularly conceivable in this case that the support layer 160 is made of an electrically non-conductive plastic material. The shielding wall 55 is formed on the upper face of the support layer 160. The shielding wall 55 is for example deposited in the vapor phase as an additional layer on the support layer 160. It is obviously also conceivable that the shielding wall 55 is printed, laser sintered or otherwise applied to the support layer 160 preferably in the form of a sheet and / or with vapor deposition, in particular if the shield wall 55 is formed so as to provide a metamaterial.

In this case, the shielding wall 55 presents the abovementioned materials. Recesses 165 are provided between the shield walls 55. The recesses 165 have different lengths and are limited by strips of the shield wall 55 arranged in a logarithmic pattern. In this embodiment, the recesses 165 are therefore not made as passage openings, but as zones free of metal, without material of the shielding wall 55.

The shield wall 55 has various partial sections 170 in the form of lines, respectively. The partial sections 170 have the same width over the length of the shield 15. It is obviously also conceivable that the partial sections 170 are of different widths. The recesses 165, however, have different widths along the length of the shield. It is of course also conceivable that the recesses 165 have the same width over the length of the shield.

The shield wall 55 has the same width as the recesses 165 in a direction transverse to the length, so that the recesses 165 extend, so to speak, over the entire width of the support layer 160. It is alternatively conceivable that the different partial sections 170 of the shield wall 55 are connected to each other in the longitudinal direction and that at least a portion of the recesses 165 are thus completely surrounded by the shield wall 55.

It is of course also conceivable to combine the shielding configurations shown in FIGS. 5 to 12 with the shielding structure of FIGS. 12 and 13 with the support layer 160 and the recesses 165.

Fig. 14 shows a schematic side view of a contact system 200. Fig. 15 shows a sectional view of the contact system 200 of Fig. 14, along the section plane D-D of Fig. 15.

The contact system 200 includes a pickup unit 205 provided as the first contact device and a plug unit 210 provided as a second contact device. The socket unit 205 is connected to a first transmission line 215. The plug unit 210 is connected to a second transmission line 220. The transmission lines 215, 220 are correspondingly formed to the transmission line 20. shown in FIG. 1. The gripper unit 205 comprises a plurality of gripping elements 225 formed as a contact element, each gripping element being connected to one end of the cable 21, 22 or of the electrical conductor 25, 35 disposed in the cable 21, 22 of the first transmission line 215. The socket unit 205 further comprises a socket housing 230 where the two socket members 225 are disposed. The plug unit 210 has a plug housing 235 disposed to the left of the housing 230 of Figure 14. Plug elements 240 formed as contact elements are provided in the plug housing 235, which are respectively connected to a longitudinal end of the plug. s cables 21, 22 of the second transmission line 220 or the electrical conductor 25, 35 disposed in the cable 21, 22. In the mounting state, the plug members 240 are introduced into the engaging elements 225 and are housed in the engaging elements 225. An electrical connection is thus obtained between the plug member 240 and the engaging member 225 or between the first transmission line 215 and the second transmission line 220.

The shielding 15 is furthermore designed to avoid an impedance jump in the contact system 200 and to obtain the predefined impedance curve, as previously described with reference to FIGS. 1 to 13. The shielding 15 extends for example between the second section 50 of the first transmission line 215 and the second section 50 of the second transmission line 220. Not only the non-twisted cables 21, 22 are part of the second section 50, but also the gripping elements 225 and the elements of plug 24 respectively connected to the cables 21, 22. The shielding 15 is made by way of example, as described with reference to FIGS. 1 to 13.

The socket housing 230 has as an example a circular cross section. Any other cross-sections are obviously conceivable. The shield 15 is disposed within the socket housing 230 and protects the engaging members 225 or plug members 240 inserted into the engaging members 225 with respect to an environment 245. The shield 15 may be For example, it may be deposited in the vapor phase or printed inside the socket housing 230, or it may be applied in any other way to an electrically non-conductive material of the socket housing 230.

In this embodiment, the socket housing 230 further extends longitudinally over the entire second section 50 of the first transmission line 215. It is of course also conceivable that the shield 15 is made in two parts and arranged for example in the area of the socket housing 230, against the socket housing 230, is made sheet-shaped at the second section 50, and is guided around the second section 50 of the first transmission line 215.

It is of course also conceivable that the shield 15 is disposed on the outer periphery of the socket housing 230.

It is pointed out that what has been described for the plug housing 230 relative to the shielding 15 also applies to the plug housing 235 and to the shield 15 disposed against the plug housing 235. It is also conceivable to apply the shield 15 on the socket unit 205 and the plug unit 210 after connection of the socket unit 205 with the plug unit 210, the second sections 50 of the transmission lines 215, 220 then being simultaneously protected against the environment 245.

FIG. 16 represents a diagram of an impedance Z carried along the length 1 of the contact system 200 of FIGS. 14 and 15. The arrangement of the impedance matching system 10 in the zone of the untwisted cables 21, 22 (second section 50) and the contact system 200 maintains the impedance Z (shown by a solid line in FIG. 16) substantially constant along the length 1 as well as in the zone of the contact system 200.

Better signal transmission can thus be achieved and crosstalk can be minimized between the two transmission lines 215, 220. The improved signal transmission generally lengthens the lengths of the transmission lines 215, 220 and / or increases the number of contact systems 200 for transmitting signals between two points. The data rate can be further increased by the best signal transmission. The impedance of the shield 15 is usually substantially adjusted to the impedance Z of the transmission line 20, 215, 220. It is obviously also conceivable for the transmission line 20, 215, 220 to have a different impedance Z than that of the system. impedance matching 10.

It is thus conceivable that the first transmission line 215 has a first impedance Ζχ in the first section 45. The first impedance Ζχ is constant on the first section 45 of the first transmission line 215. The first impedance Ζχ can thus be equal to 100 Ohm. The first section. 45 of the second transmission line 225 has a second impedance Z2 different from the first impedance. The second impedance Z2 is constant on the first section 45 of the second transmission line 220. The second impedance Z2 may for example be equal to 50 Ohm. Other values are obviously possible for the first and / or the second impedance Ζχ, Z2. The shield 15 of the impedance matching system 10 is made in this case so that the impedance Z has a predefined curve in the second section 50. The predefined impedance curve of the shield 15 is selected in such a way that that the impedance Z (represented by a dashed line in FIG. 16) drops from the first impedance Ζχ to a second impedance Z2 along the length 1 of the transmission lines 215, 220 and the contact system 200. It is alternatively conceivable that the impedance curve Z rises from the first impedance Ζχ to the second impedance Z2. It is particularly advantageous in this case that the rise or fall of the predefined impedance curve is linear or degressive, or progressive or regressive.

This has the particular advantage of making it possible to easily adapt an impedance Z of the transmission line 20, 215, 220 to the impedance matching system 10. It is for example conceivable to continuously adapt a transmission line 50 Ohm (second transmission line 220) to a 100 Ohm transmission line application (first transmission line 215) by means of the shield 15, by a corresponding adaptation of the impedance matching system 10. This presents in particular the advantage of being able to adapt in a simple way the transmission lines to various applications in the case of manufacture of cable bundles, in particular for motor vehicles, and to be able to reduce the number of parts accordingly.

The predefined impedance curve described with reference to the figures can be obtained by adapting to each other the shielding 15 and the transmission line 20, 215, 220 as a function of an impedance to be reached or the curve of predefined impedance of the impedance system. The adaptation can be carried out in particular by varying in a targeted manner the geometrical arrangement and the conformation of the recesses 60, 120, 135, 165 and the corresponding embodiment of the shielding wall 55, described with reference to FIGS. 5 to 13.

It is emphasized that the characteristics described for the embodiments can obviously be combined with one another so as to adapt the shielding system 10 accordingly to the corresponding application.

Although the invention has been illustrated and described in detail with reference to the preferred embodiment example, it is not limited to the disclosed examples, other variations that can be deduced by those skilled in the art without leaving the invention. scope of protection of the invention.

List of reference signs 10 Cable shielding system 15 Shielding 20 Transmission line 21 First cable 22 Second cable 25 First electrical conductor 30 First insulation 35 Second electrical conductor 40 Second insulation 45 First section 50 Second section 55 Shielding wall 60 Recess 65 Hollow Out 70 First Row 75 First Row 80 Second Row 85 Second Row 89 Depression 90 Glue layer 95 First wall section 100 Second wall section 105 Additional row 110 Third wall section 115 Fourth wall section 120 Hole 125 First face front 130 Second end face 135 Hole 140 Wall section 145 First section 150 Second section 155 Center section 156 Center axis 160 Support layer 165 Hole 170 Partial section 200 Contact system 205 Catch unit 210 Plug unit 215 First transmission line 220 Second transmission line 225 Plug element 230 Plug box 235 Plug box 240 Plug elements 245 Environment

Claims (12)

1. Impedance matching system (10) - with at least one shield (15) and at least one transmission line (20), - the transmission line (20) comprising a first cable (21) and a second cable (22), - the first cable (21) being twisted with the second cable (21) on a first section (45) of the transmission line (20), - the shield (15) being at least partially arranged, and the cables (21, 22) being untwisted on the second section (50) of the transmission line; - the shield (15) having a shield wall (55) at least partially enclosing the transmission line (20) on its periphery, - the shield (15) having at least one recess (60, 120, 135, 165), - the recess (60, 120, 135, 165) being formed in the shield wall (55), - recess (60, 120, 135, 165) and the shield wall (55) being adapted to each other such that a transition between the first section (45) and the second sec tion (50) has a predefined impedance curve, the system being characterized in that: - the shield (15) has a first end face (125) opposite to the first section (45) of the transmission line (20) and a second end face (130) remote from the first section (45), the recess (120, 135) having a differentiated width from the first end face (125) to the second end face (130). An impedance matching system (10) according to claim 1, characterized in that the recess (120) tapers from the first end face (125) to the second end face (130). An impedance matching system (10) according to one of claims 1 or 2, characterized in that at least three recesses (60, 120, 135, 165) are provided, the recesses (60, 120, 135, 165) being arranged in a regular pattern and / or with a constant spacing therebetween in the shield wall (55). An impedance matching system (10) according to one of claims 1 to 3, characterized in that the recess (60) is entirely surrounded by a material of the shield wall (55). An impedance matching system (10) according to one of claims 1 to 4, characterized in that: - the shielding wall (55) comprises a first wall section (95) and a second wall section (100, 110, 115), the first wall section (95) being preferentially opposed to the first section (45), a plurality of recesses (60) being provided in the first wall section (95) and in the second wall section (100, 110, 115), - a first distribution density of the recesses (60) in the first wall section (95) being different from a second recess distribution density (60) in the second section wall (100, 110, 115), and / or - the number of recesses in the first wall section (95) being greater than the number of recesses in the second wall section (100, 110, 115). An impedance matching system according to one of claims 1 to 5, 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. Ί. Impedance matching system (10) according to one of claims 1 to 6, characterized in that the shielding (15) comprises at least one of the following materials: - electrically conductive materials, - aluminum, - copper, - materials electrically conductive plastics, - ferrite, - plastics material filled with ferrite, - sintered ferrite, - material in the form of a sheet, - material with a permittivity of greater than 1, preferably greater than 1.5, in particular greater than 2, advantageously greater than 5, especially greater than 10, and / or less than 1000, material with a permittivity less than 1, in particular with a negative permittivity, and / or with a permittivity of greater than -1000, with a magnetic permeability μ greater than 1.3, preferably greater than 1.5, in particular greater than 2, advantageously greater than 10, particularly preferably greater than 100, and / or less than 1000, - material with a permeability of less than 1, in particular with a pr negative permeability, and / or with a permeability greater than -1000, - material, - liquid coating material / powder. 8. Impedance matching system (10) according to one of claims 1 to 7, characterized in that the shield (15) is formed as a sheet. An impedance matching system (10) according to one of claims 1 to 8, characterized in that each cable (21, 22) comprises: - an electrical conductor (25, 35), an electrical signal with a wavelength (λ) being transmissible by means of the electrical conductor (25, 35), - the recess (60) having a recess contour (65) with a peripheral length, - a value of the peripheral length of the contour recess (65) being at least less than the value of a half-wavelength (λ), preferably less than one-tenth of a wavelength (λ). 10. Impedance matching system (10) according to claim 9, characterized in that the peripheral length has a value less than 150 mm, preferably less than 30 mm. 11. Impedance matching system (10) according to one of claims 1 to 10, - the predefined impedance curve being substantially constant, or - the predefined impedance curve being ascending or descending of a first impedance (ZT) at a second impedance (Z2), - the upward slope or the downward slope being preferably linear or degressive or progressive or regressive. 12. Contact system (200) with an impedance matching system (10) according to one of claims 1 to 11 and a contact device (205, 210), - the contact device (205, 210) being provided for making electrical contact with another electrical component, - the shield (15) at least partially surrounding the contact device (205, 210). Contact system (200) according to claim 12, characterized in that: - the contact device (205, 210) comprises at least two contact elements (225, 240) and a housing (230, 235), - a respective contact element (225, 240) being fixed at one end of an electrical conductor (25, 35) of the cable (21, 22), the contact elements (225, 240) being arranged in the housing (230 , 235), the shielding (15) being disposed between the contact element (225, 240) and the housing (230, 235) or at least partially around the periphery of the housing (230, 235).