Patent Application
20220215987
The present invention relates generally to a cable, and more particularly to a low-loss and high-speed signal cable used to transmit high-frequency signals.
With the rapid development of big data and the Internet of Things, the demand for high-speed and high-frequency signal cables has grown rapidly. However, in the process of high-frequency and high-power signal transmission, cables are susceptible to interference from external electromagnetic signals and cannot guarantee stable and effective signal transmission.
Therefore, it is necessary to provide a high-speed signal cable with low loss, high transmission rate, good bending resistance, and simple manufacturing.
A main object of the present invention is to provide a high-speed signal cable with low loss, high transmission rate, and good bending resistance.
To achieve the above-mentioned object, a cable comprises a pair of wires including two inner conductors and a respective insulating layer covering each of the two inner conductors; a first shielding layer covering the pair of core wires; a second shielding layer covering the first shielding layer; and an outer coating layer covering the second shielding layer, wherein the insulation layer is covered with a sheath layer that is simultaneously extruded and formed, and the sheath layer covers the core wires so that the two core wires abut each other in parallel.
Compared to prior art, the present invention has the advantage that the cable conductor spacing is smaller, making the structure more compact. At the same time, the cable has good shielding effect and good bending resistance.
In this embodiment, the core wire 10 includes two wires abutting each other in parallel and extending in the longitudinal direction. The core wire 10 includes two inner conductors 11, and the two inner conductors 11 are separately covered with an insulating layer 12, the insulating layer 12 is covered with a sheath layer 13 which is simultaneously extruded and formed. The sheath layer 13 compactly wraps the core wire 10, so that the two core wires abut in parallel, which can effectively reduce the attenuation in the signal transmission process, and at the same time, further enhance the anti-twisting performance, greatly reducing and dispersing the torsion stress on the core wire, and prolongs the service life of the cable. It should be noted that there are air gaps between the insulating layer 12 and the sheath layer 13, and there are also air gaps between the first shielding layer 15, the ground wire 18 and the second shielding layer 16.
The inner conductor 11 is selected from the group including a pure copper conductor, a silver-plated copper conductor, and a tin-plated copper conductor. The insulating layer 12 is made of any one or a mixture of two of polyethylene, polypropylene, polyperfluoroethylene propylene, foamed polyethylene, Foamed polyperfluoroethylene propylene, and polytetrafluoroethylene. The sheath layer 13 is made of any one or a mixture of two of polyethylene, polypropylene, polyperfluoroethylene propylene, foamed polyethylene, Foamed polyperfluoroethylene propylene, and polytetrafluoroethylene.
The first shielding layer 15 is spirally wound or longitudinally wraps the core wire 10. The coating method of transverse winding will have seams between adjacent windings, so compared to the coating method of transverse winding, the shielding effect of spiral winding or longitudinal coating is better. The first shielding layer 15 is selected from the group including hot-bonded aluminum foil, pure aluminum foil, double-sided aluminum foil, heat-bonded copper foil, pure copper foil, and double-sided copper foil. The second shielding layer 16 is spirally wound or longitudinally wraps the first shielding layer 15. The second shielding layer 16 is selected from the group including hot-bonded aluminum foil, pure aluminum foil, double-sided aluminum foil, heat-bonded copper foil, pure copper foil, and double-sided copper foil. The second shielding layer 16 increases the thickness of the entire shielding layer and increases the shielding effect. At the same time, the two-layer shielding layer also enhances the bending resistance of the cable.
The outer coating layer 17 is made of hot-bonded PET (polyethylene terephthalate), which is spirally wound in different directions to cover the second shielding layer 16 to make the cable structure more stable. The ground wire 18 is arranged at the left and right ends of the outer side of the first shielding layer 15, and is located on the extension line of the center line of the inner conductor 11.
The above describes only some of the embodiments of the present invention, but not all of the embodiments. Any equivalent changes to the technical solutions of the present invention by those skilled in the art by reading the description of the present invention are covered by the claims of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110002751.7 | Jan 2021 | CN | national |
