DE19719410A1 - High frequency data transfer cable of improved efficiency - Google Patents

Abstract

An HF data transfer cable comprises two groups (1, 2) of four insulated conductors each eg. (3, 4, 5) which are warped together with a relatively long pitch, held in position by a dielectric cord (6) or (7) wound with the same lay but smaller pitch. The cords (6, 7) space the two groups (1, 2) which lie parallel to each other and are surrounded by an insulating tape (8) spirally wound against the lay of the groups (1, 2) with edges overlapping. A compound tape comprising an aluminium outer end polyester inner layer is wrapped around the complete assembly stabilised by a metal wire (10) and the whole is covered by a final protective sheath during an extrusion process.

Description

The present invention relates to an electrical High frequency transformer cable that is a transmission of Allows data signals with a frequency of up to 300 MHz.

Such a cable comprises at least one arrangement of electrical conductors, the individually insulated conductors stranded are to have any arrangement along its entire length to form uniform geometric properties. To high Transferring data rates are facilities for holding the Heads of each formed arrangement are provided to prevent deformations to avoid this arrangement and so its geometry throughout the operations of manufacturing and attaching the cable preserve.  

Document EP-A-0 568 048 teaches such a cable with one Double star quad, its individually insulated conductors into one such an arrangement are twisted and so by an inner tubular shell and possibly a previous one, the foursome surrounding strapping can be kept. This cable includes also a shield surrounding the foursome and an outer one Cover to protect the cable. This will change the geometry of the Foursome preserved and even made more uniform than the one that is obtained on a four stranding machine, what improves the crosstalk behavior in the foursome and Allows high frequency transmissions. The inner one Envelope spaced the shield from the foursome, causing the Attenuation along the cable can be reduced. The However, the presence of this inner shell makes it Operations of connecting the cable, especially to one Terminal connector, difficult and relatively lengthy.

Document EP-A-0 643 399 teaches High-frequency transformer cable with arrangements of conductors, especially two foursome that are grooved in the grooves of one dielectric strand is provided, which is provided to preserve the geometry of each of the arrays and the Separate arrangements from each other and keep them stranded. The Grooves of this strand are longitudinal openings with a narrow longitudinal slot. This dielectric strand enables relatively easy access to the ladders after opening the outer protective cover of the cable and must for  Connection operations of the cable along the end pieces of the Head of each arrangement can be removed.

The present invention has the task of such a cable those of the aforementioned known solutions by the aforementioned inner shell and / or strapping around each formed arrangement or by which the various Arrangements receiving grooved dielectric strand preserve the benefits achieved, but the disadvantages of these known solutions to avoid the follow-up operations simplify the cable.

The invention relates to an electrical High frequency transformer cables with arrangements consisting of individually isolated and stranded to form any arrangement electrical conductors are formed, devices for holding the head of each order formed to preserve the Geometry of this arrangement and an outer protective cover, the arrangements of conductors in parallel and essentially are arranged side by side, characterized in that the holding devices by a dielectric strand are formed, the helical around each formed Arrangement with the same stroke as that of the stranding of the Head of this arrangement, but with a smaller pitch than that wound the stranding of the conductors of this arrangement is.  

Advantageously

• - The cable comprises two or four arrangements that consist of Conductors are formed with their dielectric strand for Keep the ladder of each of them provided and stuff are arranged in parallel next to each other, possibly a insulating tape surrounding the assemblies and one Shielding and a wire for the continuity of the Shield arranged around the assemblies and are covered with the outer shell,
• - The dielectric strand has a thickness around each arrangement of between 0.3 and 1 mm and serves as a spacer between the arrangements and between each arrangement and the shield,
• - The conductor arrangements are four.

The features and advantages of the present invention result derive from the following description of a preferred Embodiment shown in the accompanying drawings is illustrated. Show it:

Fig. 1 shows a section through an inventive Übertragerkabel with two quads,

Fig. 2 is a side view of one of these four in a changed scale.

Referring to FIG. 1, one can see a high-frequency transmitter cable with two fours 1 and 2 , whose respective conductors 3 are identical and comprise a central wire such as 4, covered with insulation such as 5.

With reference also to FIG. 2, the conductors of each arrangement for forming this arrangement are stranded with a relatively large pitch, varying from four to four, in the order of 30 to 50 mm. They are held together by a dielectric strand 6 around the quad 1 and in the same way by a dielectric strand 7 around the quad 2 . This strand is wound around the conductors of the corresponding arrangement formed with the same lay as that of the stranding of the conductors of this arrangement, but with a significantly smaller pitch than that of the stranding of these conductors. The pitch of the strand is of the order of 10 mm. This strand preferably has a circular cross section, but can also have a square or rectangular cross section without forming a band, and has a thickness of 0.3 to 1 mm.

These two fours 1 and 2 with their dielectric strand 6 or 7 for holding the conductors of each of them are arranged in parallel next to one another and thereby separated by the dielectric strands and thus spaced from one another by the thickness of one or the other of the strands.

An insulating tape 8 is placed around the two fours to hold them side by side.

This band is helical in one stroke opposite that of the strand coiled, the edges of this band overlap.

A shield 9 is attached around the insulating tape and surrounds the two fours below. This shield is preferably an aluminum-polyester composite strip, in which the aluminum is on the outside. A metal wire 10 for the continuity of the shield is mounted on the shield. The shield is attached by overlapping its edges from one of the fours to another on only one side of these two fours. The wire 10 for the continuity of the shield is in turn arranged between the two fours on the other side of them.

In one variant, the shielding is directly around the two fours arranged in parallel next to each other without these two Four attached insulating tape attached.

An outer protective sheath 11 surrounds the shield 9 and the wire 10 for the continuity of the shield and ensures the protection of the cable. This sleeve 11 is extruded.

The helical wound on each foursome dielectric strand spaced the shield from it Foursome, thereby reducing the impedance of the cable at a given Dimension of the fours enlarged and thus the linear damping of the Cable can be reduced.

The crosstalk behavior between the fours is determined by the not negligible distance between the two fours improved that from the dielectric strand on each of results in them and reduces the coupling between them.

The crosstalk behavior in each of the fours will also be improved in that the preservation of its geometry by the dielectric strand is secured to the conductor "holds" by putting them back in their place and the Geometry obtained at the exit of the stranding machine improved.

This cable with improved performance data has a Crosstalk between foursome and in every foursome in the The order of magnitude of -60 dB at 20 MHz and of -50 dB at 100 MHz as well as an impedance uniformity of ± 5% to 8% of 1 to 300 MHz.

Furthermore, the dielectric strand 6 or 7 on each quad makes connecting the cable very convenient and simple. The sheath and any insulating tape around each of the fours are conveniently removed to a desired length by using the space between the fours to cut through this sheath and any tape at this point. The strand in turn then dissolves without any problems and is cut off in order to gain access to the individual conductors of each foursome.

Of course, the cable can only be a single foursome included, its conductor through the dielectric strand are held and then by the shield and then by the outer protective cover are surrounded. As a modification, it can Cables also include two formed arrangements that are different than are built up in the form of fours, especially two pairs instead of the aforementioned two fours, or there can be four Arrangements, in particular include four fours.

Claims (6)

1. High frequency transmitter cables with assemblies formed from individually insulated electrical conductors stranded to form each assembly, means for holding the conductors of each assembly formed to maintain the geometry of that assembly, and an outer protective sheath, the assemblies of conductors being parallel and substantially parallel are arranged side by side, characterized in that the holding devices ( 6 , 7 ) are formed by a dielectric strand which is helical around each arrangement ( 1 , 2 ) formed with the same stroke as that of the stranding of the conductors of this arrangement, but with a smaller pitch than that of the stranding of the conductors of this arrangement is wound up. 2. Cable according to claim 1, characterized in that it comprises a shield ( 9 ) for which the strand around each arrangement has the function of a spacer between this arrangement and the shield. 3. Cable according to claim 1, characterized in that there are two or four arrangements formed from conductors ( 1 , 2 ), which are provided with their dielectric strand for holding the conductors ( 3 ) of each of them and are arranged in parallel next to each other, spaced from each other by the strand around each of them, and includes a shield ( 9 ) surrounding the assemblies ( 1 , 2 ) and associated with a wire ( 10 ) for the continuity of the shield under the outer sheath ( 11 ) . 4. Cable according to claim 3, characterized in that it comprises an insulating tape ( 8 ) which is applied around the assemblies ( 1 , 2 ) to hold them side by side, and which is surrounded by the shield ( 9 ). 5. Cable according to one of claims 3 and 4, characterized in that the arrangements formed from conductors ( 1 , 2 ) are foursome. 6. Cable according to one of claims 2 to 5, characterized in that the dielectric strand ( 6 , 7 ) has a thickness of between 0.3 and 1 mm around each arrangement.