Data cable and motor vehicle with the data cable

#The invention relates to a data cable for transmitting data signals in the high frequency range, for example in the megahertz or gigahertz range, and to a motor vehicle having such a data cable.

#Ethernet technology is known for the transmission of data and is also in particular increasingly used in motor vehicles. Automobile Ethernet lines are usually composed in this context of merely one conductor pair, whereas in customary domestic installation lines, for example, of the category CAT 5, CAT 6, typically four pairs are combined in one data cable. In the field of automobiles, the data lines are frequently embodied without a pair screen, that is to say a respective conductor pair is not provided with screening. A respective conductor pair is typically stranded together. Furthermore, so-called quad strandings, in particular star quads, in which four conductors are stranded to one another, are known.

#In such non-screened lines, the high-frequency fields also propagate in the outer region, that is to say, in particular, in the sheath surrounding the respective conductor pairs or the quad stranding. The sheath therefore influences the transmission quality and the transmission loss of a high-frequency data cable.

#FIG. 1 is a cross-section taken through a data cable according to a first basic variant with a foamed outer sheath;

#FIG. 2 shows a side view of the data cable illustrated in FIG. 1 with fitted-on plug indicated;

#FIG. 3A shows a cross-sectional illustration of a data cable according to a second basic variant, in which a spunbonded fabric, as a jacket with a high proportion of air, directly surrounds a transmission core and at the same time defines the outer sheath;

#Referring now to the figures of the drawing in detail, all the data cables 2 which are described below are cables preferably for symmetrical signal transmission in which the signal is transmitted over one line of a line pair, and an inverted signal is transmitted over the other line of a line pair. The data cable 2 is preferably a non-screened data cable 2, that is to say, it does not have any screening. It has a comparatively simple structure. The data cable 2 in the exemplary embodiments has only a single conductor pair as a transmission core 4. The conductor pair is composed here of two conductors 6 which are each formed by a line 8 and a conductor insulation 10 which surrounds it concentrically. The two conductors 6 are stranded to one another, that is to say twisted together, with a lay length.

#The conductor insulation 10 is preferably composed of polypropylene, and the line 8 is, in particular, a stranded conductor. The individual wires of the stranded conductor are embodied, in particular, as copper wires and are preferably tin-plated.

#As an alternative, the transmission core 4 can be formed by a quad stranded assembly, in particular a so-called star quad, in which two conductors 6 which are located diagonally opposite one another define the conductor pair for the symmetrical data transmission. The four conductors 6 are stranded to one another. The conductors 6 bear with their conductor insulations 10 directly against one another. A filler strand can be arranged in the center in order to ensure the high level of symmetry which is desired for an interference-free signal transmission.