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High-precision foamed coaxial cable

A coaxial cable, high-precision technology, applied in the direction of coaxial cable/analog cable, cable insulation structure, etc., can solve the problem that it is difficult to realize coaxial cable, etc., and achieve the effect of reducing the change of characteristic impedance value

Inactive Publication Date: 2007-05-02
HIRAKAWA HEWTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] That is, the conditions for the coaxial cable to be flexible and withstand mechanical stresses such as bending, twisting, and sliding are completely opposite to the conditions for improving the accuracy of the characteristic impedance value, so it is difficult to achieve A coaxial cable that is flexible, resistant to mechanical stress, and has excellent characteristic impedance value accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] By the method described in the embodiment of the present invention, the reduction ratio (compression ratio) of the outer diameter of the insulator 2 was changed, the insulated core 5 was molded, and the variation in the outer diameter of each insulated core 5 was studied. The inner conductor 1 is a conductor obtained by twisting seven annealed copper wires plated with silver plating with a thickness of 1 μm and an outer diameter of 0.16 mm. The outer diameter accuracy of the silver-plated annealed copper wires is 2 / 1000 mm or less. The porous strip-shaped body 21 uses a material with a porosity of 80%, so that the winding angle of the strip-shaped body is 80 degrees, and the winding tension is 0.70kg / mm 2 . The results are shown in Table 1.

[0076] Insulator outer diameter compressibility (%)

[0077] When the compressibility (10%) of the outer diameter of the insulator 2 is increased, the tensile force when passing through the forming drawing die when the s...

Embodiment 2

[0079] Using the method described in the embodiment of the present invention, the coaxial cable 10 was formed by changing the penetration rate of the braid into the insulator 2 (insulated core 5), and the braid outer diameter and characteristic impedance value of each coaxial cable 10 were studied. deviation. The results are shown in Table 2. The braided wire used for the braid is a silver-plated annealed copper wire with a thickness of 1 μm and a tin alloy (0.75% copper) plating with a thickness of 0.5 μm. The variation in the characteristic impedance value was measured using the TDR measurement method, and the standard deviation was obtained.

[0080] Biting rate of braid (%)

[0081] By increasing the biting rate of the braid, the insulator and the braid can be integrated, the circularity of the braid can be improved, and the deviation of the characteristic impedance value can be reduced. However, if the bite rate is set to 35% or more, the frictional resistance...

Embodiment 3

[0083] Using the method described in the embodiment of the present invention, the coaxial cable 10 is shaped by changing the biting rate of the braid into the insulator 2 (insulated core 5) and the type of plating of the braided wire, and each coaxial cable 10 is examined. The changes in the characteristic impedance value (bend test) and the flexibility of the coaxial cable 10 (flexibility test) when a core rod with a diameter of Φ5 is wound five turns. The results are shown in Table 3. The braided wire used for the braid is a silver-plated annealed copper wire plated with a silver film with a thickness of 1 μm, and a silver-plated annealed copper wire with a thickness of 1 μm is plated with a tin alloy (0.75% copper) plating with a thickness of 0.5 μm. Annealed copper wire with double plating.

[0084] The bending test measures the characteristic impedance value (A) of a cable cut to 500mm. The central part of the cable is about 200mm wrapped around a core rod with an outer ...

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Abstract

A high-precision foamed coaxial cable in which, even if a mechanical stress such as bend, torsion, or slide is applied to a cable, variation in shape of an insulator and an outer conductor is less and as a result, the external shape and the outside diameter of the cable can be maintained and variation in characteristic impedance can be reduced. In a high-precision foamed coaxial cable (10) comprising an inner conductor (1) constructed by stranding conductors, an insulator (2) constructed by winding a porous tape (21) around the outer circumference of the inner conductor (1), and an external conductor (3) constructed by braiding thin conductor wires around the outer circumference of the insulator (2), the insulator (2) is formed to have right circle external shape, the outside diameter of the insulator (2) is formed smaller at a reduction rate of 3-5% than the outside diameter, immediately after the winding, of the insulator (2), the external conductor (3) is formed to have right circle external shape, the outside diameter of the external conductor (3) is formed smaller at a reduction rate of 2-4% than the outside diameter, immediately after the braiding, of the external conductor (3) and the precision of its characteristic impedance is set at +-1 Omega.

Description

technical field [0001] The present invention relates to a high-precision foamed coaxial cable in which the insulator on the outer periphery of the inner conductor is formed by a porous strip body and the outer conductor is formed by a braided shielding body, especially relates to the determination of its characteristic impedance value even if mechanical stress such as bending and torsion is added. High-precision foam coaxial cable with little change. Background technique [0002] Advances in a highly information-based society in recent years have required higher transmission speeds and higher transmission accuracy for information communication equipment and test and inspection devices for semiconductor elements used in the information communication equipment. Therefore, also for coaxial cables and coaxial cords used in these devices and apparatuses, higher transmission speeds and higher transmission accuracy are required. [0003] The transmission characteristics of the coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B11/18
CPCH01B11/1847H01B11/1839
Inventor 岩崎光男田中胜男
Owner HIRAKAWA HEWTECH
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