JPH06203664A - High frequency coaxial cable and its manufacture - Google Patents

Abstract

PURPOSE:To improve the high frequency characteristic of a shielded wire having spiral covering, metal tape winding or braiding and provide a coaxial cable never having a defect that working is difficult as a coaxial cable having a copper pipe as an external conductor, limiting extension in length and reduction in diameter. CONSTITUTION:A tape layer 3 having a metal layer is provided on the outer circumference of an insulating layer 2, and a metal wire is spirally wound or braided 4 on the outside thereof. The resulting wire is dipped in a fused metal tank, and the tape layer having the metal layer and the spirally wound metal wire layer or the braided layer are integrated together by the package coating 5 of the metal to form an external conductor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable for transmitting high frequency signals.

[0002]

2. Description of the Related Art A shielded electric wire or coaxial wire used as an internal wiring of an electronic device is a horizontally wound shielded wire in which a large number of thin conductors are spirally wound around an outer periphery of an insulating layer,
A shielded wire wound with a metal tape and a braided shielded wire in which a conductor is braided are widely used. However, high-frequency signals have come to be used, for example, in the wiring of mobile phones, and the above-mentioned shielded wire is not suitable due to the large amount of attenuation, and the coaxial wire using a copper pipe as the outer conductor. Has come to be used.

[0003]

A coaxial line using a copper pipe as an outer conductor has excellent electrical characteristics such as a small high frequency resistance of the outer conductor and a small amount of attenuation even when transmitting a high frequency signal. . However, since a copper pipe is used as the outer conductor, there is a limit to the length of a series of electric wires, and it is difficult to connect the copper pipe with solder or the like because of the entanglement with the insulator.

[0004]

DISCLOSURE OF THE INVENTION The present invention improves the high-frequency transmission characteristics of a shield wire such as horizontal winding, metal tape winding, and braiding, and is difficult to process like a coaxial wire using a copper pipe as an outer conductor. It is an object of the present invention to obtain a coaxial wire which does not have the drawback that there is a limitation in lengthening and thinning. That is, a tape layer having a metal layer is provided on the outer periphery of the insulating layer, and a metal wire is wound or braided on the outer side of the insulating layer and immersed in a molten metal bath to form a tape layer having the metal layer and a horizontally wound metal wire. It is characterized in that the above-mentioned object is achieved by integrating the above layer or the braided layer.

[0005]

EXAMPLE An example will be described with reference to FIG. Center conductor 1
For this, a silver-plated copper-coated steel wire with an outer diameter of 0.20 mm is used, which is coated with a 0.23 mm-thick tetrafluoroethylene resin as insulation 2, and the periphery thereof is vapor-deposited with a copper thickness of 0.006 mm. An aluminum polyester tape is wrapped vertically with the metal side facing outward to form a tape layer 3 having a metal layer, and a tin-plated annealed copper wire having a wire diameter of 0.046 mm is wound or braided 4 around the tape layer 3. The tape layer having the metal layer and the horizontal winding or the braid were integrated by immersing in a molten tin bath and collectively coating with tin. Further, a protective layer 6 was provided on the outer circumference to complete the coaxial wire.

[0006]

As in the present invention, a copper pipe is not used as an outer conductor, and a tape layer having a metal layer and a horizontal winding or a braid are dipped in a molten metal tank and collectively coated with this metal. If the tape layer having the metal layer and the horizontal winding or the braid are integrally formed as an outer conductor,
The length can be easily increased and the diameter can be reduced. or,
Were as 0.8～3.0GH _Z result of measuring an attenuation amount in the range of Table 1, it was found that unlike laterally wound shield products are superior high frequency transmission characteristics.

[0007]

[Table 1]

[Brief description of drawings]

FIG. 1 shows a coaxial cable of the present invention.

[Explanation of symbols]

 1: Central conductor 2: Insulating layer 3: Tape layer with metal layer 4: Horizontally wound shield or braid 5: Collective coating with metal 6: Protective layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Harada 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industries, Ltd. Kanto Works (72) Inventor Seiji Endo 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industry Co., Ltd. Kanto Works

Claims (2)

[Claims] 1. A tape layer having a metal layer is provided on the outer periphery of an insulating layer, a metal wire is wound or braided on the outer side of the tape layer, and the metal wire is immersed in a molten metal bath to form a tape layer having the metal layer.
A method for manufacturing a coaxial wire, characterized by integrally forming a layer of a horizontally wound metal wire or a braided layer to form an outer conductor. 2. A tape layer having a metal layer, which is provided on the outer periphery of the insulating layer, and a laterally wound layer or a braided layer of metal wires, which is provided on the outer periphery of the tape layer, are integrated by collective coating of metal to form an outer conductor. A coaxial line characterized by being formed.