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Coaxial cable

A cable and coaxial technology, applied in the field of coaxial cables, can solve problems such as complex production and difficult realization

Inactive Publication Date: 2011-09-21
HUBERSUHNER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Type (1) is very complex to produce and can only be realized with great difficulty especially in the case of small cable sizes

Method used

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example

[0056] A prototype (20) of a coaxial cable according to the invention was produced, which is shown in Figure 3 and has the following data:

[0057] Inner conductor: silver-plated copper conductor (diameter d1=1.7mm)

[0058] Hollow fiber: Quartz glass, 27 x 650 μm; 25 fibers in two layers

[0059] Outer conductor: Winding CuAg strip

[0060] Dielectric constant (εr): 1.22

[0061] Attenuation at 18GHz: 3.1

[0062] Attenuation at 26.5GHz: 4.5

[0063] Phase change: 3600ppm (linear), from -55°C to +125°C temperature range

[0064] However, if the inner conductor 11 consists of silver-plated FeNi36Ag (Invar), the relatively high temperature-dependent phase transition in this prototype case can be drastically reduced (to 90 ppm) and thus have practically negligible thermal expansion.

[0065] Tag list:

[0066] 10, 20 coaxial cable

[0067] 11 inner conductor

[0068] 12 outer conductor

[0069] 13 Dielectric (e.g. hollow SiO 2 fiber)

[0070] 14,15 Hollow fibers (such...

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Abstract

The present invention relates to a coaxial cable (10) comprising a central inner conductor (11) that is concentrically surrounded by an outer conductor (12) at a specified distance, wherein the intermediate space between the inner conductor (11) and outer conductor (12) is filled with a dielectric (13). A coaxial cable having especially good mechanical and electrical properties is achieved by the dielectric (13) comprising a plurality of hollow fibers (14, 15, 19) that extend in the longitudinal direction of the cable and are composed of a glass, and by at least the inner conductor (11) having a thermal expansion coefficient that is matched to the dielectric (13) with regard to a least possible temperature-related phase change in the coaxial cable (10).

Description

technical field [0001] A coaxial cable has a central inner conductor that is concentrically surrounded by an outer conductor at a certain distance. The intermediate space between the central inner conductor and the concentric outer conductor is filled with a dielectric. Low linear attenuation (dB / m) of phase shift over temperature and Linear dependence, and / or near-zero dependence is of particular importance for coaxial cables and applicability for very high frequencies in the GHz range. Background technique [0002] For example, very low attenuation can be achieved by filling the intermediate space between the central inner conductor and the outer conductor as completely as possible with air (relative permittivity εr=1). On the other hand, in many cases the dielectric also takes on the task of stabilizing and fixing the central inner conductor in the center so that the concentric structure of the cable is maintained even when the cable is bent or twisted. [0003] A high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B11/18
CPCH01B11/1817H01B11/1843
Inventor 斯特凡·梅茨斯特凡·舍勒
Owner HUBERSUHNER AG