CN113539562A

CN113539562A - Composite layer of wrapping structure for transmission cable

Info

Publication number: CN113539562A
Application number: CN202110086836.8A
Authority: CN
Inventors: 李政
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-20
Filing date: 2021-01-22
Publication date: 2021-10-22
Anticipated expiration: 2041-01-22
Also published as: CN113539562B; TW202141541A; TWI753756B

Abstract

The invention provides a composite layer for a transmission cable, which coats a conductor of the transmission cable and comprises an inner wrapping layer and a wrapping layer. The wrapping layer is attached to the inner wrapping layer through a gluing material. This interior is used for reducing the dielectric constant around the covering, should be used for increasing this transmission cable's bending strength around the covering.

Description

Composite layer of wrapping structure for transmission cable

Technical Field

The invention relates to a cable structure, in particular to a cable wrapping structure for high-speed/high-frequency transmission.

Background

In the present cable manufacturing process, an insulating layer is directly pressed on the conductor to achieve the protection and insulation effects, as shown in fig. 1, the conductor 10 in the transmission cable 1 is covered with an insulating layer 11. However, the dielectric constant of the insulating layer has a great influence on the performance of high frequency/high speed transmission, so that the dielectric constant is usually reduced by using a foaming material, but the foaming material cannot easily reach the distribution and yield standards in the manufacturing process, and the outer diameter of the insulating layer manufactured by using the foaming material is relatively large, which limits the size selection in the mechanism.

Therefore, the wrapping process is used to improve the above problems, the transmission loss of the cable manufactured by the wrapping process under high frequency/high speed is lower than that of the cable manufactured by the foaming process, but the mechanical properties of the wrapped cable, such as bending resistance, tensile strength and elongation, are insufficient, and the cable is easy to be bent in the wire arranging and manufacturing processes to cause the core to break, so that the yield is reduced.

Therefore, it is desirable to provide a cable structure that improves bending resistance, tensile strength, and elongation.

Disclosure of Invention

To solve the above problems, according to an embodiment of the present invention, a composite layer for a transmission cable is provided, which covers a conductor of the transmission cable and includes an inner wrapping layer and a wrapping layer. The wrapping layer is attached to the inner wrapping layer through a gluing material. This interior is used for reducing the dielectric constant around the covering, should be used for increasing this transmission cable's bending strength around the covering.

In this embodiment, the conductor may be stranded.

In this embodiment, the conductor may be composed of a metal or an alloy.

In this embodiment, the inner wrapping layer may be formed of a foam material.

In this embodiment, the wrapping layer may be made of an insulating material.

In this embodiment, the inner wrapping layer may wrap the conductor for cladding.

In this embodiment, the wrapping layer may be wrapped around the inner wrapping layer by rolling.

According to another embodiment of the present invention, a transmission cable is provided, which includes a conductor and a composite layer. The composite layer covers the conductor and comprises an inner wrapping layer and a wrapping layer. The wrapping layer is attached to the inner wrapping layer through a gluing material. This interior is used for reducing the dielectric constant around the covering, should be used for increasing this transmission cable's bending strength around the covering.

The transmission cable provided by the invention reduces the dielectric constant by wrapping the inner wrapping layer on the conductor before wrapping, and in addition, the inner wrapping layer can enable the wrapping to be more compact so as to improve the insulation and anti-interference effects, so that the electrical instability under the wrapping condition in the prior art can be improved, and the mechanical strength can be improved.

Those skilled in the art will appreciate that the effects that can be achieved through the present disclosure are not limited to what has been particularly described hereinabove, and that the advantages of the present invention will be more clearly understood from the foregoing detailed description taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is an example of a transmission cable made using existing lapping technology.

Fig. 2 is an example of a transmission cable according to an embodiment of the present invention.

Fig. 3A is an example of a transmission cable according to another embodiment of the present invention.

Fig. 3B is a partial structure example in the transmission cable of fig. 3A.

Fig. 4 is an example of a transmission cable based on the embodiment of fig. 3A.

FIG. 5 is a time domain reflectometry graph according to an embodiment of the present invention.

Fig. 6 is a graph of a feed loss measurement according to an embodiment of the present invention.

Description of the reference numerals

1.2, 2' transmission cable

10: conductor

11 insulating layer

12. 121-123 taped covering

13, inner wrapping layer

14 composite layer

15, a bonding material

Detailed Description

Referring to fig. 2, fig. 3A and 3B, fig. 2 is an example of a transmission cable according to an embodiment of the invention. The transmission cable 2 comprises, in order from inside to outside: conductor 10, inner wrapping 13, and wrapping 12. Fig. 3A is an example of a transmission cable 2' according to another embodiment of the present invention, and fig. 3B is a partial structure example in the transmission cable of fig. 3A. As shown in fig. 3B, the present embodiment is different from the embodiment shown in fig. 2 in that the wrapping layer 12 is attached to the inner wrapping layer 13 by a bonding material 15 to form a composite layer 14, so that the wrapping layer 12 and the inner wrapping layer 13 can be wrapped around the conductor 10 only by one-time wrapping procedure of the composite layer 14, thereby achieving a double-layer protection effect. It should be noted that in this embodiment, the wrapping layer 12 and the inner wrapping layer 13 are each composed of at least two layers of polymer through the adhesive material 15.

Referring to fig. 4, fig. 4 is an example of a transmission cable based on the embodiment of fig. 3A. As shown in fig. 4, two cables of the structure of fig. 3A are wrapped with a conductor 10 using

wrapping layers

121, 122 and 123 to form a transmission cable. The wrapping layer 121 is mainly composed of the above-mentioned material of the wrapping layer 12 and is covered on the composite layer 14 by the adhesive material 15. Similarly, the wrapping layer 122 is composed of the above material of the wrapping layer 12 and covered on the wrapping layer 121 by the adhesive material 15, and the wrapping layer 123 is composed of the above material of the wrapping layer 12 and covered on the wrapping layer 122 by the adhesive material 15. It should be noted that the wrapping layer 121, such as the wrapping layer 12 and the inner wrapping layer 13, is preferably composed of at least two layers of high molecular polymer through the adhesive material 15. In addition, in the preferred embodiment of the present invention, the inner wrapping layer 13 included in the composite layer 14 has a thickness of 0.012 to 0.024mm, and is made of the above-mentioned polyetherimide (PI or Kapton) material, the composite layer 14 also includes the adhesive material 15 having a thickness of 0.01 to 0.02mm, the wrapping layer 12 has a thickness of 0.15mm and is made of teflon with a foaming degree of 65% to 77% (dielectric constant is 2.1 before foaming and 1.25 to 1.39 after foaming), and the composite layer 14 is manufactured by using a drawing rate of 0.1 to 0.5m/min and an overlapping rate of 32% to 37% during the wrapping process. The above mentioned materials, thickness, drawing rate and tape overlapping rate are only preferred examples and are not intended to limit the present invention.

Thus, the composite layer of the present invention, such as the composite layer of PTFE, can achieve higher roundness, higher impedance and lower feeding loss compared to the prior art using dual PTFE layers. The prior art compared here is to use a double PTFE layer, made of 65% expanded PTFE, but made with a 0.3m/min draw rate and 50% tape overlap during the lapping process. Preferably, the present invention can achieve a roundness of more than 93%, while the prior art can achieve a roundness of only 80-85%, and at the same time, achieve a differential mode impedance of 105 ohms, which is higher than 99 ohms and has a lower input loss (I/L) than the prior art, and preferably, the present invention can achieve a value of-2.97 dB for a value of-3.4 dB for a value of the input loss.

Referring to fig. 5, fig. 5 is a graph illustrating time domain reflectometry according to an embodiment of the invention. As shown in fig. 5, the Time Domain Reflectometry (TDR) curve obtained by using the transmission cable manufactured by the above preferred values, which includes m1(0.8045,104.7784) and m2(1.5914,105.9300), can fall within the differential impedance range of 100-110 ohm, which is the case in the prior art, but can only be below 100 ohm.

Referring to fig. 6, fig. 6 is a graph illustrating a measurement curve of the loss in feeding (IL) according to an embodiment of the present invention. As shown in fig. 6, by using the transmission cable manufactured by the above preferred values, which is a dashed curve, compared to a solid feed loss threshold curve, the values of some curves of the embodiment of the present invention can reach below the threshold value, whereas the values of the curves of the prior art exceed the threshold value.

According to the transmission cable provided by the invention, the inner wrapping layer is coated on the conductor before wrapping to increase the bending strength, and in addition, the wrapping is tighter, the torsion and stretching resistant degree is improved, and the insulation and anti-interference effects are improved by the staggered winding mode of the inner wrapping layer, so that the electrical instability under the wrapping condition in the prior art can be improved, and meanwhile, the mechanical strength, the roundness, the impedance and the feed loss are improved and reduced.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. The description is thus not to be construed in a limiting sense in all respects, but rather as illustrative.

The scope of the invention should be determined by reasonable interpretation of the appended claims and all changes which come within the range of equivalents of the invention are intended to be embraced therein.

Claims

1. A composite layer for a transmission cable, which covers a conductor of the transmission cable and comprises:

an inner wrapping layer; and

the lapping layer is attached to the inner lapping layer through a gluing material;

wherein, should be used for reducing the dielectric constant around the covering in, should be used for increasing this transmission cable's bending strength around the covering.

2. A composite layer according to claim 1, wherein the conductor is stranded.

3. A composite layer according to claim 1, wherein the conductor is comprised of a metal or alloy.

4. A composite ply as claimed in claim 1, wherein the inner cladding ply is formed from a foamed material.

5. A composite laminate as claimed in claim 1, wherein the wrapping is comprised of an insulating material.

6. A composite sheet according to claim 1, wherein the inner cladding wraps the conductor for cladding.

7. A composite laminate according to claim 1, wherein the surround is wrapped around the inner surround by a coil.

8. The utility model provides a transmission cable's around package structure which characterized in that, it includes:

a conductor; and

a composite layer covering the conductor, and comprising:

an inner wrapping layer; and

9. The wrapping structure defined in claim 8 wherein the conductor is formed by twisting a plurality of strands.

10. The wrapping structure defined in claim 8 wherein the conductor is comprised of a metal or an alloy.

11. The wrapping structure defined in claim 8 wherein the inner wrapping layer is formed of a foamed material.

12. The wrapping structure defined in claim 8 wherein the wrapping layer is comprised of an insulating material.

13. The wrapping structure defined in claim 8 wherein the inner wrapping layer wraps the conductor for covering.

14. The wrapping structure defined in claim 8 wherein the wrapping layer is wrapped around the inner wrapping layer.