JP3013637B2 - High frequency coaxial cable and method of manufacturing the same - Google Patents

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 a high-frequency signal.

[0002]

2. Description of the Related Art As a shielded electric wire and a coaxial line used as internal wiring of electronic equipment, a horizontally wound shielded wire in which a number of thin conductors are spirally wound around an outer periphery of an insulating layer,
Widely used are shielded wires formed by metal tape winding, braided shielded wires formed by braiding conductors, and the like. However, high-frequency signals have come to be used in, for example, the wiring of mobile phones, and the above-mentioned shielded wires have large attenuation and are unsuitable. Has come to be used.

[0003]

A coaxial cable 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 attenuation in transmission of a high-frequency signal. . However, since a copper pipe is used for the outer conductor, there is a limit to the length of a series of electric wires, and there is a problem that it is difficult to connect the copper pipe by soldering or the like because of the connection with the insulator.

[0004]

SUMMARY OF THE INVENTION The present invention improves the high-frequency transmission characteristics of shielded wires 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 line which has no disadvantage that there is a limit 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 horizontally wound or braided on the outside thereof, and this is immersed in a molten metal bath, and a tape layer having a metal layer and a horizontally wound metal wire are provided. The above object is achieved by integrating the above layer or the braided layer.

[0005]

An embodiment will be described with reference to FIG. Center conductor 1
Used a silver-plated copper-coated steel wire with an outer diameter of 0.20 mm, coated it with a 0.23 mm-thick ethylene tetrafluoride resin as an insulation 2, and deposited a copper vapor-deposited 0.006 mm-thickness around the circumference. The aluminum polyester tape is wrapped vertically with the metal surface facing out, a tape layer 3 having a metal layer is provided, and a tin-plated soft copper wire having an element wire diameter of 0.046 mm is horizontally wound or braided 4 around the tape layer 3. The tape layer having a metal layer was immersed in a molten tin bath and coated collectively with tin to integrate the horizontal winding or braid. Further, a protective layer 6 was provided on the outer periphery to complete a coaxial line.

[0006]

According to the present invention, a tape layer having a metal layer and a horizontal winding or braid are immersed in a molten metal bath without using a copper pipe as an external conductor, and the metal is coated by a batch coating method. If it is a method of integrally forming a tape layer having a metal layer and a horizontal winding or braid as an external conductor,
Elongation is easy 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 the 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 shielded or braided 5: Batch coating with metal 6: Protective layer

Continued on the front page (72) Inventor Tetsuo Harada 3-3 Satsuki-cho, Kanuma-shi, Tochigi Sumitomo Electric Industries, Ltd. Kanto Works (72) Inventor Seiji Endo 3-3, Satsuki-cho, Kanuma-shi, Tochigi Sumitomo Electric (56) References JP 3-11046 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 13/00 H01B 11/00-11/22

Claims (2)

(57) [Claims] 1. A tape layer having a metal layer is provided on an outer periphery of an insulating layer, and a metal wire is horizontally wound or braided on the outer side thereof, immersed in a molten metal bath, and a tape layer having a metal layer;
A method for manufacturing a coaxial wire, comprising forming an external conductor by integrating a layer of a horizontally wound metal wire or a braided layer. 2. A tape layer having a metal layer provided on an outer periphery of an insulating layer and a horizontal winding layer or a braided layer of a metal wire provided on the outer periphery of the tape layer are integrated by collective coating of metal to form an external conductor. A coaxial line characterized by being formed.