DE1640698A1 - Coaxial high-frequency cable with spacers consisting of individual web-shaped support elements - Google Patents

Description

1640838

V a Hei- und Met allwerke 1,838

Gutehoffmmgshütte Aktiengesellschaft May 23, 1967

Coaxial high-frequency cable with spacers consisting of individual web-shaped support elements

The invention relates to a coaxial radio frequency cable with a single bar-shaped support element Spacer bracket c

The attenuation of coaxial high-frequency cables is known to occur composed of two components, the resistance ■ attenuation - caused by the high frequency resistance of the conductors - and the discharge attenuation - caused by d.i e dielectric losses of the inner conductor in the outer conductor centering dielectric -, the dissipation loss can have a substantial share in the total dänfpimg. The amount of dissipation loss depends on the type of used i.e. electrical material depending on its geometric dimensions, including the volume fraction of the solid dielectric on the entire cavity insulation.

For oitifi low-loss power transmission on a coaxial high-frequency cable, it is therefore necessary to use a solid g

Dielectric to be used, which is a small dielectric Loss angle and a small relative dielectric constant possesses, and in addition the volume fraction of the solid di to keep elfktriknms on the ■ fiesjont dielectric as small as possible.

The fulfillment of the latter condition has already been proposed been to plug or spray disks on the inner conductor in certain axial distances, which materialann are carried out, partly by making openings b; e-

*
sit, partly because they are only thin. Further

* one

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Spacers attached to the inner conductor at axial intervals have been proposed, the three web-shaped supports offset by 1? O each! ementen exist, which are arranged on a Ri ¹ ^ g resiliently encompassing the inner 3. Furthermore, spacer shafts are known which consist of individual web-shaped support elements arranged at a distance from one another on a shaped strand, the shaped strand being applied helically to the inner conductor. This bar-shaped support! emente have · * «?? * &■" On the side facing the outer conductor, especially when the outer conductor is corrugated, a T-shaped support surface extending in the axial direction, which ensures proper support on the corrugated outer! g ^ during ^ i ^ ton should.

All of these known spacers have the jodoch Disadvantage that the dissipation loss is still relatively high is. It is also part of the known spacers quite cumbersome and expensive to manufacture and ultimately with the presence of a corrugated inner and / or outer conductor Can no longer be used at all or only if the material volume is increased in order to achieve the desired mechanical properties Stability «tir support is achieved.

These disadvantages and difficulties are now being enjoyed by the invention overcome in that each individual support element is arranged free-standing on a foot on the inside 'and at least where the inner conductor is on a small one Angle of circumference I encompassing ^ foot means? To spatial fixing the support elements are provided.

With this structure according to the invention and this arrangement Fro supports, dip most appropriately from a har (-. Elastic Material exist, there is a very small Ableituugsdampfing at. , high mechanical strength of the support elements.

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This is due to the fact that the dissipation loss is greatest at the point of the highest field strength in the dielectric. However, as is well known, the highest field strength occurs in a coaxial cable on the inner conductor, so that when the solid dielectric is reduced in the vicinity of the outer conductor or on the inside.! pus, dip drainage loss can be particularly greatly reduced. By removing the dielectric connecting parts between the individual support elements that are present with the known spacers, a strong reduction in the dissipation attenuation can be achieved without the mechanical load-bearing capacity of the belts being unduly influenced. Ultimately, this low-material design would have the advantage that expensive granular materials can now also be used

Dio web-shaped support! N certain emente arranged AXIP] s intervals from one another lying radial planes, both in se ± ⁴ n, as in anrh bpstiramtfin distances from each other on a helically-för mig to the InHenlei. the running line. The 1 otzt-mentioned embodiment i pt because of the better longitudinal uniformity in electrical and mechanical terms

To the room! In order to fix the support elements, a mandrel is most expediently arranged on the side of the foot resting against the inner conductor, the largest diameter of which is at least equal to or slightly larger than the diameter of a corresponding hole to be provided in the inner conductor. The holes to be provided in the inner conductor are most expediently pressed into the inner conductor, since when the holes are pressed in, the "n"? IlerauszHi away or difficult falling DFTR single S + iJtznlenionte. The latter

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is particularly present when the mandrel pns dem the same material as the support element - η3 so made of plastic - because then the ridge on the inside of the Holes like a barb into the insulating material, If there is a thin new conductor wall, the mandrel or mandrels are made of metal; this h .- «t the advantage that the prop] emente in a simple way, by pressing the metallic mandrel (s) into the Coat can be used up.

For further spatial definition of the individual web-shaped Support element is recommended for. To be available of a corrugated inner conductor, on the one on the inner conductor adjacent side of the foot at least one in the inner duct - xinternal direction running tmd into the recess of the conductor to provide engaging rib. Dadtirch surrenders increased stability in the axial direction, so that the diameter of the mandrel or mandrels, especially in the case of flexible cables, in which the Bi eniny has high axial forces can act on the support element, can be kept small and thus avoid the risk of foreign mode excitation will.

After all, it is the spatial definition of the individual Supports on the inside! ei.ter also possible that on the Inner conductor arranged side of the foot, with an adhesive zti provided so that the supports are glued to the inner ladder.

For further clarification of the invention, reference is made to idpr figures, which show exemplary embodiments of the spacing switches according to the invention in a partially schematic representation. Figures 1 and 2 and 3 and k show each

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a cross section and a longitudinal section through an HRps according to the invention Support element. Pns support element 1 is on the Inneninitnr 2 spatially defined with a 3 mandrel. Of the Mandrel 3 is on the side of the inner conductor 2 facing 4 arranged foot. The nteg-shaped part 5 of the support element it 1 has reinforcing ribs in a known manner. Ani Anßen.Ladder-side end of the web-shaped part 5 branch a T-shaped abutment sf lache 6, the largest dimension of which is ^ extends in the axial direction, arranged for proper support. The outer conductor is that Omitted for the sake of clarity.

FIGS. 3 and 4 show an embodiment of a support element in which there are two ribs 8 engaging in the recess 7 of the inner conductor 2 ^{on the side of the foot 4 serviced by the inner conductor 2 1.}

MO

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Claims (1)

Cable and metal works 1 Gutehoffnungshütte Aktiengesellschaft 23.5 “1967 Patent Claims 1. Coaxial high-frequency cable with a single bar-shaped cable Support elements existing spacer, thereby characterized in that each individual support element one foot is arranged free-standing on the inner conductor and at least on dom the inner conductor on a small one Circumferential angle time-taking foot means to set spatial " of the support element are provided. Coaxial high-frequency cable according to Claim 1, characterized in that that the support elements are arranged in radial planes lying at certain axial distances from one another. 3 · Koaxialos high-frequency cable according to claim I _1, characterized in that the Stut. ¹ * elements are arranged on a helical line leading around the inner conductor at certain distances from one another, _{see fig} ko A coaxial high-frequency cable according to one of Claims t - 3 »characterized in that on the voltage applied to the inner conductor of the Soite Fusso"? Mindfistfins pin mandrel is arranged, the largest diameter of which is equal to or slightly larger than the diameter of a corresponding hole to be provided in the tuning 1 eitor. f) o Coaxial high-frequency cable according to claim 4, characterized in that that the mandrel is made of metal. - 2 SAO OWQiNAL 009835/0585 6e coaxial high-frequency cable according to claim 4 or 5 » by the fact that the holes in the inner section are pressed. 7 · KoaTcialea high-frequency cable according to one of claims 1-6 with a corrugated inner conductor, characterized in that on the side of the foot resting on the inner conductor, at least one opening into the inner conductor starts into the A ^ er + iefunn ;; de "Trnenl pus engaging rib is present. Coaxial audio frequency cable according to one of the claims 1-7 »« iadiirch irekennsrei chnet that / the inside] ow arranged side of the foot with an adhesive vers eh eijA st. • AD ORiGlNAL 009835/0585 Blank page