DE1065499B - Termination for a coaxial line with a solid dielectric between the inner conductor and the outer conductor consisting of a metal braid - Google Patents

Description

PATENT OFFICE

kl. 21c 23/12

INTERNATIONAL KL.

H02g; f

S 58426 VIIId / 21 c

REGISTRATION DATE: MAY 30, 1958

NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: SEPTEMBER 17, 1959

The invention relates to a termination for a coaxial line with solid dielectric between the inner conductor and the outer conductor consisting of at least a single-layer metal mesh the outer conductor braid lying directly on the solid dielectric at the end of the line is enclosed by a metal sleeve and slipped back over this and with the by the eversion formed end face is pressed against a massive external conductor continuation.

In the case of a termination of the aforementioned type, which usually merges into a connector, so far, the so-called formation of the high-frequency cable was made in such a way that over the first and underneath the possibly existing second metallic braid forming the outer conductor a metal sleeve is pushed. The first braided shield resting on the solid dielectric is braided out and pulled back over the edge of the sleeve. In this way it establishes the connection of the outer cable conductor with the outer conductor of the connector. As a result of this braiding and the eversion For reasons of tolerance, there is a gap between the solid dielectric and the braided shield above it unavoidable air gap, which reduces the capacitance per unit length in this cross-sectional plane of the cable significantly reduced. To eliminate this disruption, it is known to longitudinally close the molding sleeve slots, radially resilient and pressed so strongly against the solid dielectric that the Molding sleeve with practically no air gap in the molding area on the solid dielectric, for example Polyethylene. Although this is an electrically usable solution, it leads below Circumstances to the unpleasant result that the everted shielding braid when pressed against the Connector outer conductor is cut off.

The invention is based on the object of providing a way in which it is possible to produce an end closure of the type described in the introduction, among other things, precisely with regard to the difficulties described to improve significantly.

This task is in a termination for a coaxial line with solid dielectric between dom inner conductor and the outer conductor consisting of at least a single-layer metal braid the outer conductor braid lying directly on the solid dielectric at the end of the line is enclosed by a metal sleeve and slipped back over this and with the by the eversion formed end face is pressed against a massive ν outer conductor continuation, according to the jErfindung solved in such a way that between the 'end face of the outer conductor braid and the massive Termination for a coaxial line

with solid dielectric

between the inner conductor

and the one made of a metal mesh

existing outer conductor

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Dipl.-Ing. Alfred Wittmann, Munich,
has been named as the inventor

Outer conductor continuation a metallic perforated disc is embedded, whose strength and hole diameter are chosen such that the inductive interference caused by the formation of the outer conductor braid is balanced.

The invention is explained in more detail using exemplary embodiments.

Fig. 1 shows an end closure for a coaxial \ consisting of an inner conductor 2 and the inner conductor under two enclosure of a solid dielectric 3 comprising metallic shin braids 4 and 4 'as the outer conductor. A metal sleeve 5, which has a radially directed flange 6, on whose side facing the cable, the outer braid 4 'rests and means a washer 7 and a nut 9 screwed into the connector outer conductor 3 is pressed. At the end facing the plug side 14, the metal sleeve 5 is provided with a tubular extension 11, preferably rounded on the front side 10, around which the braided inner metallic braid 4 is wrapped and by means of a metal spring 12, which can also be replaced by a rubber ring ;: can , is set. The front side 10 serves at the same time as a stop against the metal part 13, which is the continuation of the outer conductor, of the encl lock or plug which is otherwise designed in the usual way.

909 628/303

Claims (2)

To compensate for the inductive error in the wave resistance of the coaxial line caused by the formation in the area of the point 10, viewed from the coaxial line 1 to the output of the actual plug connection 14, a metallic perforated disk 15 is provided according to the invention. The thickness and the inner diameter of this perforated disk are selected in such a way that this compensation means results in a continuous wave resistance from the coaxial line 1 to the plug connection 14. In the exemplary embodiment, a disk made of dielectric is used as a centering piece 16 for holding the inner conductor in the transition area from the molding point to the actual plug 14, which disk is embedded in the outer conductor in a manner known per se. Fig. 2 also shows a trained according to the teaching of the invention, at the same time serving as an end closure plug connection in coaxial design, in which this centering piece 16 is replaced by a cylinder made of dielectric material, such as polystyrene, which in a known manner with grooves 17 for Achieving a continuous wave impedance is provided across the connector. In this case too, a perforated disk 15 is provided according to the teaching of the invention. When assembling the termination with the coaxial line 1, i. H. When forming the inner braided shield 4, it is advisable to first slightly remove the solid dielectric 3, which is elastic, for example. B. 0.5 mm to protrude over the front edge 10 of the inner Schirnigetlechts 4 and then to press through the assembly with the perforated disk in the correct position. This ensures that, in the assembled state, the solid dielectric 3 is almost certainly in contact with the perforated disk 15 with practically no air gap. This circumstance is of particular importance because it makes the electrical conditions at this point independent of the internal workings of the dielectric 3. For this reason, too, it is advisable to use pre-aged dielectric in a manner known per se. The shape of the perforated disk can also deviate from the circular shape and, for example, be oval, since it is essentially important to compensate for the inductive interference and to provide a clear stop for the dielectric 3. Patent to η f. UcHE: 15 1. Termination for a coaxial line with a solid dielectric between the inner conductor and the outer conductor consisting of at least a single-layer metal mesh, in which am At the end of the line, at least the outer conductor braid lying directly on the solid dielectric is enclosed by a metal sleeve and slipped back over this and with the through the everted end face is pressed against a massive external conductor continuation, characterized in that between the end face of the outer conductor braid and the massive Outer conductor continuation a metallic perforated disc is embedded, whose strength and hole diameter are chosen so that the reasoned in the formation of the outer conductor braid inductive interference is compensated. 2. End closure according to claim 1, characterized in that the solid dielectric on the metallic perforated disc, preferably with low contact pressure, rests. 1 sheet of drawings ©, 909 628/303 9. 59