CN216311370U

CN216311370U - Mixed-medium double-coaxial differential transmission signal line

Info

Publication number: CN216311370U
Application number: CN202123095371.7U
Authority: CN
Inventors: 许利强; 张军萍; 叶沪伟; 黄远志
Original assignee: Jiangsu Anlan Wanjin Electronic Co ltd
Current assignee: Jiangsu Anlan Wanjin Electronic Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-04-15
Anticipated expiration: 2031-12-10

Abstract

The utility model discloses a mixed medium dual-coaxial differential transmission signal wire which is a dual-coaxial cable, namely the signal wire comprises two core wires arranged in parallel, the middle part of each core wire is a conductor, a first insulating layer adopting a first insulating medium and a second insulating layer adopting a second insulating medium are sequentially wrapped outside the conductor, a third insulating layer adopting a third insulating medium is commonly wrapped outside the two core wires, the first insulating medium, the second insulating medium and the third insulating medium are different from each other, and a shielding layer and a polyester film layer are further sequentially wrapped outside the third insulating layer. According to the utility model, through the mixed structure design of different insulating layers outside the conductor, the overall dielectric constant is between the maximum dielectric constant and the minimum dielectric constant, and the overall dielectric constant is flexibly adjustable between the maximum dielectric constant and the minimum dielectric constant, so that the transmission performance of the cable is better, and the insertion loss is lower.

Description

Mixed-medium double-coaxial differential transmission signal line

Technical Field

The utility model belongs to the technical field of high-speed signal transmission cables, particularly relates to a double-coaxial cable, and particularly relates to a double-coaxial differential transmission signal line.

Background

The high-speed signal transmission cable is a connection line for transmitting high-frequency signals. The high frequency lines are all shielded lines, and the transmission path has signal energy attenuation due to the existence of impedance, so that the high frequency lines are widely used and are generally used for data transmission.

Conventional high-speed signal transmission cables use silver-plated copper conductors, which are covered with an insulating material and then shielded. The insulation material is generally PP, PE, FEP, and the dielectric coefficient of the material determines the transmission loss of the high-speed transmission cable. A typical high speed cable is exemplified by 30AWG 1.0m, and has an attenuation loss of 6.0dB at a frequency point of 16 Ghz. How to further reduce the attenuation of the cable is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a mixed medium bi-coaxial differential transmission signal line which is better in transmission performance and lower in insertion loss.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a two coaxial differential transmission signal lines of mixed medium, the signal line is two coaxial cable, promptly the signal line includes two parallel arrangement's heart yearns, the middle part of heart yearn is a conductor, the conductor wraps up the first insulating layer that has adopted first insulating medium and the second insulating layer that adopts second insulating medium outward in proper order, two the common parcel has the third insulating layer that adopts third insulating medium outside the heart yearn, first insulating medium, second insulating medium, third insulating medium are different each other, the third insulating layer still wraps up shielding layer and polyester film layer outward in proper order.

Furthermore, the second insulating layer and the third insulating layer are tightly connected, no gap is formed at the joint of the second insulating layer and the third insulating layer, and the third insulating layer and the shielding layer are tightly connected and have no gap therebetween.

Further, the mylar layer is partially wrapped outside the shielding layer at intervals, that is, a gap is formed between the shielding layer and the mylar.

Further, a ground wire is arranged in the gap.

Furthermore, the cross section of the signal wire is oblate, and the ground wires are respectively arranged at two ends of the gap along the length direction of the oblate.

Further, the ground wire is of a twisted structure of a single conductor or a multi-strand conductor.

The number of the transmission signal wires is more than or equal to two, the transmission signal wires are coated in the coating layer together, and the transmission signal wires are arranged in the coating layer in parallel.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, through the mixed structure design of different insulating layers outside the conductor, the overall dielectric constant of the cable can be adjusted among the dielectric constants of the conductor, the conductor and the cable, so that the transmission performance is better, and the insertion loss is lower.

2. The wire rod can be selected to have a larger specification after the given center distance of the product, the wire rod can be transmitted for a longer distance, the transmission bandwidth is increased, and meanwhile, the physical size of the wire rod can be smaller, and the occupied space is reduced.

3. The shielding area can be larger, the coupling between the signal line conductors can be increased, and the coupling between the conductors and the shielding can be reduced.

4. The differential and common-mode impedances can be better harmonized.

Drawings

FIG. 1 is a cross-sectional view of a hybrid dielectric bi-coaxial differential transmission signal line;

fig. 2 is a perspective view of a layer structure of a mixed-medium dual-coaxial differential transmission signal line;

FIG. 3 is a schematic view of the layer structure from the left or right side of FIG. 1;

FIG. 4 is a schematic view of the deck structure from the top or bottom view of FIG. 1;

FIG. 5 is a schematic structural view of two transmission signal lines coated as a whole;

FIG. 6 is a schematic structural view of eight transmission signal lines coated as a whole;

fig. 7 is a schematic structural view of sixteen transmission signal lines wrapped together.

The labels in the figure are: 1-a conductor; 2-a first insulating layer; 3-a second insulating layer; 4-a third insulating layer; 5-a shielding layer; 6-ground wire; 7-a polyester film layer; 8-transmission signal line; 9-coating layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment provides a mixed-medium dual-coaxial differential transmission signal line mainly used for transmission of high-frequency signals. The signal line is a dual coaxial cable, that is, as shown in fig. 1, the signal line includes two core wires arranged in parallel.

The specific structure of the mixed-medium dual-coaxial differential transmission signal line of the embodiment is shown in fig. 1 to 4, and the overall section of the transmission signal line is oblate. The two core wires in the signal wire have the same structure and respectively comprise a conductor 1 in the middle, and a first insulating layer 2 and a second insulating layer 3 which are sequentially wrapped outside the conductor 1 from inside to outside, wherein the first insulating layer 2 adopts a first insulating medium, and the second insulating layer 3 adopts a second insulating medium. The material of the conductor 1 includes, but is not limited to, silver-plated copper, tin-plated copper, bare copper, and the like. And a third insulating layer 4 is wrapped outside the two core wires, and a third insulating medium is adopted by the third insulating layer 4. In this embodiment, the first insulating medium includes, but is not limited to, solid PP/PE/FEP, foamed PP/PE/FEP, and the like; the second insulating medium includes, but is not limited to, polytetrafluoroethylene microporous membrane tape (EPTFE) and the like, and the structure thereof includes, but is not limited to, one layer or a plurality of layers; the third insulating medium includes, but is not limited to, the use of PP/PE/FEP, etc. The third insulating layer 4 is sequentially wrapped with a shielding layer 5 and a polyester film layer 7(PET) from inside to outside. In this embodiment, the shielding layer 5 includes, but is not limited to, aluminum foil mylar/copper foil mylar/tin foil mylar, and the like, and the structure thereof includes, but is not limited to, an inward side or an outward side.

In this embodiment, the first insulating layer 2, the second insulating layer 3, and the third insulating layer 4 are made of different insulating materials, that is, the first insulating medium, the second insulating medium, and the third insulating medium are different from each other. The mixed-medium dual-coaxial differential transmission signal line of the present embodiment is further provided with a ground wire 6, specifically, as shown in fig. 1, the mylar layer 7 is partially wrapped outside the shielding layer 5 at intervals, that is, a gap is provided between the shielding layer 5 and the mylar layer 7. The ground wire 6 is disposed in the gap. As shown in fig. 1, in the present embodiment, the ground wires 6 are arranged at both ends in the length direction of the oblate cross section of the signal wire, respectively. In this embodiment, the ground wire includes, but is not limited to, silver-plated copper/tin-plated copper, etc., and the structure thereof includes, but is not limited to, single or multiple strands.

In this embodiment, the other layer structures are all tightly connected except for the gap between the shielding layer 5 and the mylar 7. Namely, the second insulating layer 3 and the third insulating layer 4 are tightly connected except for the joint of the two core wires which is inevitably not tightly connected due to structural reasons; the third dielectric layer 4 and the shielding layer 5 are tightly connected without a gap therebetween.

As shown in fig. 5 to 7, in this embodiment, a coating layer 9 may be further provided for coating the transmission signal lines 8 (only two transmission signal lines in fig. 5, 8 transmission signal lines in fig. 6, and 16 transmission signal lines 8 in fig. 7 are exemplified) with a number greater than or equal to two into one cable. Specifically, the plurality of transmission signal lines 8 are collectively coated in the coating layer 9, and the plurality of transmission signal lines 8 are arranged in parallel in the coating layer.

As shown in fig. 5, when the number of the transmission signal lines 8 is 2, two transmission signal lines 8 are arranged in the cladding 9 with the long sides thereof butted against each other. As shown in fig. 6, when the number of the transmission signal lines 8 is 8, the coating layer 9 includes a central layer and an outer layer, the central layer is formed by arranging two transmission signal lines 8 in a manner that long sides thereof are in butt joint with each other, and the outer layer is formed by arranging six transmission signal lines 8 on the periphery of the central layer along the circumferential direction. As shown in fig. 7, when the number of the transmission signal lines 8 is 16, the coating layer 9 includes a central layer, an intermediate layer and an outer layer, wherein the central layer is a filler wire core, the intermediate layer includes six transmission signal lines 8, the six transmission signal lines 8 are arranged on the periphery of the central layer along the circumferential direction, the outer layer includes ten transmission signal lines 8, and the ten transmission signal lines 8 are arranged on the periphery of the intermediate layer along the circumferential direction. The above are only three preferable configurations of the cable including the plurality of transmission signal lines 8, and those skilled in the art will understand that the plurality of transmission signal lines 8 may be arranged in other ways to achieve the object of the present invention.

The mixed-medium dual-coaxial differential transmission signal line of the embodiment enables the overall dielectric constant to be between the maximum dielectric constant and the minimum dielectric constant through mixing of different insulating media outside the conductors, and the overall dielectric constant is flexibly adjustable between the maximum dielectric constant and the minimum dielectric constant, so that the transmission performance of the cable is better, and the insertion loss is lower. For example, when the dielectric constant of the first insulating medium is 2.1, the dielectric constant of the second insulating medium is 1.3, and the dielectric constant of the third insulating medium is 1.65, the dielectric constant of the entire cable may be limited to about 1.5. Therefore, through the design of a mixed structure of different insulating layers outside the conductor, the dielectric constant of the insulating material wrapped outside the conductor is reduced, and therefore attenuation is improved. The optimal design of structure is passed through to this embodiment for can select bigger wire rod specification after the centre-to-centre spacing of given product, can transmit longer distance, increase transmission bandwidth, wire rod physical dimension can be littleer simultaneously, reduces the occupation space. The mixed medium double-coaxial differential transmission signal line of the embodiment can have larger shielding area, can increase the coupling between the signal line conductors, reduce the coupling between the conductors and the shielding, and can better harmonize the differential and common-mode impedance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a two coaxial differential transmission signal lines of mixed medium, the signal line is two coaxial cable, promptly the signal line includes two parallel arrangement's heart yearns, its characterized in that, the middle part of heart yearn is a conductor, the conductor wraps up the first insulating layer that has adopted first insulating medium and the second insulating layer that adopts second insulating medium outward in proper order, two the outer common parcel of heart yearn has the third insulating layer that adopts third insulating medium, first insulating medium, second insulating medium, third insulating medium are different each other, the third insulating layer still wraps up shielding layer and polyester film layer outward in proper order.

2. The mixed dielectric bi-coaxial differential transmission signal line of claim 1, wherein the second insulating layer and the third insulating layer are tightly connected without a gap at the junction therebetween, and the third insulating layer and the shielding layer are tightly connected without a gap therebetween.

3. The hybrid dielectric bi-coaxial differential transmission signal line according to claim 1 or 2, wherein the mylar layer is partially wrapped outside the shielding layer at an interval, i.e. there is a gap between the shielding layer and the mylar.

4. The mixed-media dual-coaxial differential transmission signal line according to claim 3, wherein a ground line is disposed in the gap.

5. The mixed-medium dual-coaxial differential transmission signal line according to claim 4, wherein the cross section of the signal line is oblate, and the ground lines are respectively disposed at two ends of the gap along the length direction of the oblate.

6. The mixed-medium dual-coaxial differential transmission signal line as claimed in claim 4 or 5, wherein the ground wire is a twisted structure of a single conductor or a stranded conductor.

7. The hybrid dielectric bi-coaxial differential transmission signal line of claim 1, further comprising a cladding layer, wherein the number of the transmission signal lines is greater than or equal to two, a plurality of the transmission signal lines are collectively clad in the cladding layer, and the plurality of the transmission signal lines are arranged in parallel in the cladding layer.