Flexible flat cable with multi-channel crosstalk suppression capability and manufacturing method thereof

Abstract

The invention relates to the technical field of cables, in particular to a flexible flat cable with multichannel crosstalk suppression capability and a manufacturing method thereof. The flexible flat cable with the multi-channel crosstalk suppression capability comprises an insulator and more than two paths of signal transmission conductors located in the insulator, shielding layers are arranged on at least two sides of the cable in the thickness direction, and the paths of signal transmission conductors are arranged side by side in the width direction of the cable. At least one row of shielding conductors are arranged between two adjacent signal transmission conductors in the cable, the shielding conductors in the same row are arranged at intervals along the length direction of the cable, and the shielding conductors extend along the thickness direction of the cable and are in conductive connection with the shielding layers on the two sides of the thickness direction of the cable respectively. A row of shielding conductors which are arranged at intervals along the length direction of the cable form a shielding grating, so that the shielding conductors play a shielding role between two adjacent signal transmission conductors, interference between different paths of signals is reduced, and the signal transmission rate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a flexible flat cable with multi-channel crosstalk suppression capability and a manufacturing method thereof. Background Art

[0002] Currently, high-speed differential signal transmission uses flexible flat cables. This flexible flat cable with multi-channel crosstalk suppression capability is a ribbon structure. Differential pair conductors are arranged side by side inside the cable to achieve high-speed signal transmission. The basic structure of the flat cable can be seen Figure 1 The figure shows a cross-section of the cable, which primarily consists of a signal transmission conductor 1, an insulator 2, and a shielding layer 3. The signal transmission conductor is fixed within the insulator, and the shielding layer is wrapped around the insulator to achieve electromagnetic compatibility with the outside world. However, this flat cable structure results in significant interference between the signal transmission conductors, hindering the achievement of higher-speed transmission. Summary of the Invention

[0003] An object of the present invention is to provide a flexible flat cable with multi-channel crosstalk suppression capability to solve the problem that current flat cables are affected by large interference between signal transmission conductors, which is not conducive to improving signal transmission rate; an object of the present invention is also to provide a method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capability to solve the above-mentioned problem.

[0004] The technical solution of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention is: A flexible flat cable with multi-channel crosstalk suppression capability includes an insulator and two or more signal transmission conductors located in the insulator. Shielding layers are provided on at least two sides in the cable thickness direction. The signal transmission conductors are arranged side by side along the cable width direction. At least one row of shielded conductors is provided between two adjacent signal transmission conductors in the cable. The shielded conductors in the same row are arranged at intervals along the length direction of the cable. The shielded conductors extend along the cable thickness direction and are conductively connected to the shielding layers on both sides in the cable thickness direction.

[0005] Beneficial effects: The present invention is improved on the basis of the flat cable in the prior art. A shielding conductor is arranged at a position between two adjacent signal transmission conductors in the cable. The shielding conductor extends along the thickness direction of the cable. There is a part on the insulator for installing or forming the shielding conductor, so that the two ends of the shielding conductor can be conductively connected to the shielding layers on both sides in the thickness direction of the cable respectively. A row of shielding conductors arranged at intervals along the length direction of the cable form a shielding grid, so that the shielding conductor plays a shielding role between the two adjacent signal transmission conductors, reduces interference between different signals, and is conducive to improving the signal transmission rate.

[0006] Furthermore, a through hole is provided between two adjacent signal transmission conductors on the cable, which passes through the cable in its thickness direction. The through hole is formed by drilling holes in the shielding layer and the insulator. The shielding conductor is a conductor layer attached to the hole wall of the through hole.

[0007] Furthermore, the through hole is filled with a filling medium for reinforcing the conductor layer, and the filling medium is an insulating medium or a conductive medium.

[0008] Furthermore, a through hole is provided on the cable between two adjacent signal transmission conductors, which passes through the cable in the thickness direction. The through holes are arranged in a row along the length direction of the cable. The cable is provided with a conductor wire that passes around a corresponding row of through holes. The conductor wire has parts that are close to the shielding layers on both sides of the cable in the thickness direction. The shielding conductor is the part of the conductor wire that is installed in the through hole.

[0009] Furthermore, a through hole is provided on the cable between two adjacent signal transmission conductors, which passes through the cable in the thickness direction. The through holes are arranged in a row along the length direction of the cable. Two conductor wires are installed in the same row of through holes. The two conductor wires are respectively tightly attached to the shielding layers on both sides of the cable in the thickness direction. The shielding conductor is the part of the conductor wire that extends into the through hole. The parts of the two conductor wires in the same through hole are bent and hooked with each other.

[0010] Furthermore, a through hole is provided on the cable between two adjacent signal transmission conductors along the thickness direction thereof. The shielding conductor is a riveted conductor installed in the through hole. The riveted conductor is a cylinder or a round tube, and both ends of the riveted conductor are riveted onto the shielding layer.

[0011] Furthermore, a row of shielding conductors is provided on both sides of each signal transmission conductor, and multiple shielding conductors are provided in the same row along the length direction of the cable. No shielding layer is provided on both sides of the cable in the width direction.

[0012] Furthermore, the shielding conductors between two adjacent signal transmission conductors are provided in two or more rows along the width direction of the cable, and the shielding conductors of two adjacent rows are staggered.

[0013] Furthermore, the insulator is provided with air holes spaced apart along the length direction of the cable, and the air holes extend along the thickness direction of the cable.

[0014] The technical solution of the method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capability of the present invention is: A method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capability includes: after each signal transmission conductor, insulator and shielding layer are fixed, processing a through hole at a position between two adjacent signal transmission conductors of the cable, arranging a shielding conductor in the through hole and conductively connecting the shielding conductor to the shielding layers on both sides in the thickness direction of the cable, thereby manufacturing a flexible flat cable with multi-channel crosstalk suppression capability. The structure of the flexible flat cable with multi-channel crosstalk suppression capability can refer to the technical solution of the flexible flat cable with multi-channel crosstalk suppression capability mentioned above.

[0015] Beneficial effects: The present invention is an improvement on the flat cable in the prior art, and can directly produce a higher performance cable based on the existing cable. A through hole is processed on the cable, and a shielding conductor is formed in the through hole. The shielding conductor is located between two adjacent signal transmission conductors, and the shielding conductor extends along the thickness direction of the cable. There is a portion on the insulator for installing or forming the shielding conductor, so that the two ends of the shielding conductor can be conductively connected to the shielding layers on both sides in the thickness direction of the cable respectively. A row of shielding conductors spaced apart along the length direction of the cable form a shielding grid, so that the shielding conductor plays a shielding role between the two adjacent signal transmission conductors, reduces interference between different signals, and is conducive to improving the signal transmission rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a cross-sectional structure of a flat cable in the background art; Figure 2 Schematic diagram of the cross-sectional structure of embodiment 1 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention; Figure 3 for Figure 2 Schematic diagram of the distribution relationship between the signal transmission conductors and the shielding conductors of the cable; Figure 4 Schematic diagram of the distribution relationship between the signal transmission conductors and the shielding conductors of Example 2 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention; Figure 5 This is a schematic diagram of the distribution relationship between the signal transmission conductors and the shielding conductors of Example 3 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention; Figure 6 Schematic diagram of a partial structure of a flexible flat cable with multi-channel crosstalk suppression capability according to embodiment 4 of the present invention; Figure 7 for Figure 6 Cross-sectional view of the local structure in; Figure 8 1 is a perspective diagram of a partial structure of a flexible flat cable with multi-channel crosstalk suppression capability according to a fifth embodiment of the present invention; Figure 9 for Figure 8 Cross-sectional view of the local structure in; Figure 10 FIG4 is a perspective diagram of a partial structure of a flexible flat cable with multi-channel crosstalk suppression capability according to a sixth embodiment of the present invention; Figure 11 for Figure 10 Cross-sectional view of the local structure in; Figure 12 4 is a schematic cross-sectional view of a partial structure of a flexible flat cable with multi-channel crosstalk suppression capability according to a seventh embodiment of the present invention; Figure 13 for Figure 12 Schematic diagram of the riveted conductor in; Figure 14 It is a partial structural diagram of Example 8 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention.

[0017] In the figure: 1. Signal transmission conductor; 2. Insulator; 3. Shielding layer; 31. Upper shielding layer; 32. Lower shielding layer; 4. Shielding conductor; 40. Grounding hole; 41. First air hole; 42. Second air hole; 5. Filling medium; 6. Conductor wire. DETAILED DESCRIPTION

[0018] The basic concept of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention is to set a shielding conductor between two adjacent signal transmission conductors of the cable. The two ends of the shielding conductor are conductively connected to the shielding layers on both sides of the cable to play a shielding role, reduce interference between different signals, and help improve the signal transmission rate.

[0019] The present invention is described in detail below with reference to specific embodiments.

[0020] Embodiment 1 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: like Figure 2 、 Figure 3 As shown, a flexible flat cable with multi-channel crosstalk suppression capability includes a signal transmission conductor 1, an insulator 2, an upper shielding layer 31, and a lower shielding layer 32. The signal transmission conductor 1 is fixed in the insulator 2, and the shielding layer covers the outside of the insulator 2. The insulator 2 includes two layers of adhesive insulating films. The signal transmission conductor 1 is located between the two layers of adhesive insulating films and is pressed and fixed. The shielding layer is a thin sheet of metal, which is bonded and pressed and fixed on the insulator 2.

[0021] In this embodiment, the cable is a high-speed differential cable. The cable has multiple signal transmission conductors 1. One signal transmission conductor 1 is a differential pair, that is, it constitutes a signal transmission channel. The two signal transmission conductors 1 of the differential pair are arranged side by side along the width of the cable. Each signal transmission conductor 1 is arranged side by side along the width of the cable. The cable has a length direction and a thickness direction. The length direction, thickness direction, and width direction of the cable are consistent with the corresponding directions of the insulator 2. The upper shielding layer 31 and the lower shielding layer 32 constitute the two side shielding layers in the thickness direction of the cable. The spacing between two adjacent signal transmission conductors 1 is much larger than the spacing between two signal transmission conductors 1 of the same differential pair. In this embodiment, there are three signal transmission conductors 1. In other embodiments, different numbers can also be set as needed.

[0022] In this embodiment, to reduce interference between signal transmission channels, a shielding conductor 4 is provided between two adjacent signal transmission conductors 1 of the cable. The shielding conductor 4 extends along the thickness of the cable and is electrically connected to the shielding layers on both sides of the cable. The insulator 2 includes a portion for mounting or forming the shielding conductor 4, so that both ends of the shielding conductor 4 are electrically connected to the upper shielding layer 31 and the lower shielding layer 32, respectively, along the thickness of the cable. A row of shielding conductors spaced apart along the length of the cable forms a shielding grid. This allows the shielding conductor 4 to act as a shield between the two adjacent signal transmission conductors 1, reducing interference between different signals and facilitating improved signal transmission rates.

[0023] The shielded conductors 4 are arranged in rows along the length of the cable, and the shielded conductors 4 in the same row are arranged at intervals. The spacing between the shielded conductors 4 can be uniform or uneven. The size, number, position and spacing of the shielded conductors 4 are set as needed to ensure improved crosstalk performance.

[0024] A through hole is provided on the cable between two adjacent signal transmission conductors 1, which passes through the cable in the thickness direction. The shielding conductor 4 is a conductor layer attached to the hole wall of the through hole. The through hole is filled with a filling medium for reinforcing the conductor layer. The filling medium can be an insulating medium or a conductive medium.

[0025] When forming the shielding conductor 4, first use laser drilling, physical drilling or punching to obtain a bottom hole on the cable. The bottom hole is a through hole, which is generally a round hole, but other shapes can also be used. The upper shielding layer 31, the insulator 2 and the lower shielding layer 32 are punched through, and then the bottom hole is metallized, such as forming a metallized hole by copper plating, that is, forming a grounding hole. The purpose of metallization is to form an attached conductor layer. The conductor layer on the inner wall of the grounding hole forms a shielding conductor 4, so that the shielding conductor 4 is in good contact with the upper shielding layer 31 and the lower shielding layer 32. In order not to affect the grounding contact effect, the conductor layer should be ensured to be above 1μm. The metallized hole can then be filled with polymer glue or resin for reinforcement. In order to improve the crosstalk index, the grounding reliability can also be increased by plugging copper paste or silver paste, or conductive rubber, or conductive particles and other conductive media.

[0026] The shielded conductor 4 passes through the flat cable from the upper shielding layer 31 to the lower shielding layer 32, and is in good contact with the upper shielding layer 31 and the lower shielding layer 32. Punching is performed after the shielding layer is pressed together, which is more conducive to process implementation. The diameter of the grounding hole can be between 0.1mm and 1mm, and the size is related to the maximum transmission rate. When the transmission rate is below 10Gbps, the grounding hole can be set to a diameter between 0.5 and 1mm; when it is below 25Gbps, the grounding hole diameter can be designed to be between 0.5 and 0.7mm; when it is below 56Gbps, the grounding hole diameter can be designed to be between 0.25 and 0.4mm; when it is below 112Gbps, the grounding hole diameter can be designed to be between 0.2 and 0.3mm; when it is below 224Gbps, the grounding hole diameter can be designed to be between 0.1 and 0.25mm.

[0027] To achieve optimal shielding and isolation, the distance between grounding holes should be ≤λg / 20, where λg is the waveguide wavelength in the dielectric. To achieve varying crosstalk performance, the grounding holes between two signal channels can be designed as a single row, two rows, or multiple rows. The crosstalk performance of a single row of grounding holes can reach ≤-60dB, while a double row can achieve ≤-90dB.

[0028] In this embodiment, a row of shielded conductors 4 is provided on opposite sides of each signal transmission conductor 1, so that each signal transmission conductor 1 has a row of shielded conductors 4 on both sides. The two rows on opposite sides of each signal transmission conductor 1 are the two rows farthest apart. All signal transmission conductors 1 are located between the two rows of shielded conductors 4 farthest apart in the width direction of the cable. Multiple shielded conductors 4 are provided in the same row along the length of the cable. The two outermost rows of shielded conductors 4 are used to shield the signal channel on both sides of the cable width. This eliminates the need for shielding layers on both sides of the cable width. The cable width side surfaces are not covered with shielding layers, saving costs. Of course, in other embodiments, shielding layers can also be provided on both sides of the cable width.

[0029] In this embodiment, the signal transmission conductor 1 is a rectangular wire. One signal transmission conductor 1 includes two paired rectangular wires. The cross-section of the rectangular wire is rectangular. The length direction of the rectangular wire is the extension direction of the cable. The width and thickness directions of the rectangular wire are consistent with the width and thickness directions of the cable. The use of square wire is conducive to improving the stability of the flat cable structure and improving the bonding strength between the shielding layer, the insulator 2 and the conductor. It can be formed by cold pressing and low pressure. The head and tail ends of the cable can be better connected to the corresponding connector, and have better impedance matching than round wire. Of course, in other embodiments, round wire can also be used as the signal transmission conductor as needed.

[0030] Rectangular conductors are precision-drawn, with length and width tolerances of no more than ±0.005mm. This ensures differential impedance tolerances meet typical values such as 100±2Ω, 90±2Ω, 85±2Ω, or other requirements. This minimizes impedance impact and improves transmission rates. To achieve lower losses while meeting the operating frequency, wider and thicker conductors and thicker insulators are used.

[0031] Ground vias with specific diameters and spacing between differential pairs isolate the signal paths, improving crosstalk performance. These cables are used in servers to improve transmission rates and crosstalk performance. They offer low loss, excellent stability, high yield rates, and low cost, enabling automated production, making them economical and feasible.

[0032] Embodiment 2 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above embodiment 1 lies in the number of rows of shielded conductors. In the above embodiment 1, there is a row of shielded conductors between two adjacent signal transmission conductors, while in this embodiment, Figure 4 There are two rows of shielded conductors 4 between two adjacent signal transmission conductors 1, and the two rows of shielded conductors 4 are opposite to each other in the width direction of the cable.

[0033] Embodiment 3 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above embodiment 2 lies in the position relationship of the different rows of shielding conductors. Figure 5 In this embodiment, the two rows of shielding conductors 4 between two adjacent signal transmission conductors 1 are staggered. The staggered arrangement has a better shielding and isolation effect, can obtain better crosstalk indicators, and can save plane space.

[0034] Embodiment 4 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above embodiment 1 lies in the arrangement of the air holes. Figure 6 、 Figure 7 The insulator is provided with air holes extending along the thickness direction of the cable. The equivalent dielectric constant of the air holes and the insulator is smaller than the dielectric constant of the insulator itself. Many small air holes can be arranged relatively densely by utilizing the space in the length and width directions of the cable, so that the dielectric constant of the insulating medium of the cable can reach a specific appropriate value by controlling the size, number and position of the air holes. The insulating medium of the cable includes the air medium in the air holes and the solid medium of the insulator. The dielectric constant of the insulating medium is the equivalent dielectric constant of the air holes and the insulator. Since the dielectric constant of air is very low, the equivalent dielectric constant can be lowered by utilizing the air holes on the cable, thereby reducing the insertion loss of the cable and facilitating higher-speed signal transmission.

[0035] Air holes are arranged in multiple rows along the width of the cable, with multiple air holes in the same row extending along the length of the cable. Each signal transmission conductor has multiple rows of air holes on both sides of the cable width. The spacing between adjacent rows of air holes and the spacing between air holes in the same row can be adjusted as needed. The air holes can be evenly or unevenly distributed. The air holes are circular, with their centerlines perpendicular to the two sides of the insulation along the thickness direction, facilitating machining.

[0036] After the signal transmission conductors, insulators, and shielding layers of the cable are fixed together, holes are punched. Through-holes can be obtained by laser drilling, physical drilling, or punching. The shielding layer can be punched through together, and the air holes and the through-holes used to form the shielded conductors can be processed together. By removing material by punching according to a certain volume ratio, a model with a specific dielectric constant can be obtained. The air holes are evenly distributed throughout the flat cable. The diameter and number of air holes are adjusted according to the relative dielectric constant. The arrangement can be single-row, double-row, or multi-row, which is beneficial for controlling impedance fluctuations. The introduction of air holes reduces the equivalent dielectric constant of the overall insulation medium of the cable, thereby reducing the cable insertion loss. After the conductor is crimped with the film and shielding layer, holes are punched to form air columns, which is economical and feasible.

[0037] The air holes on the insulator include a first air hole 41 provided on one side of the signal transmission conductor along the width direction of the cable and a second air hole 42 provided on one side of the signal transmission conductor along the thickness direction of the cable. Any first air hole 41 is located on one side of the width direction of a signal transmission conductor, while the second air hole 42 is located on one side of the thickness direction of the signal transmission conductor. The second air hole 42 is processed using the portion of the insulator that is directly opposite the signal transmission conductor in the thickness direction of the cable. In this way, the second air holes 42 can be arranged in various areas of the insulator to further reduce losses. The air holes on one side of the signal transmission conductor along the thickness direction of the cable are directly connected to the corresponding signal transmission conductor, and the signal transmission conductor can be exposed in the air holes. Air holes on both sides of the conductor thickness direction and perpendicular to the extension direction of the conductor can be obtained by laser or mechanical drilling. In other embodiments, only the first air hole or only the second air hole can be provided.

[0038] When processing holes, the through holes used to form air holes and the through holes used to form grounding holes 40 can be processed uniformly. After the through holes are processed, one or more rows of through holes located between the two signal transmission channels are selected to form grounding holes 40 and filled with a reinforcing medium, that is, the grounding holes 40 are filled with a filling medium 5. In this embodiment, there are three rows of holes on both sides of the signal transmission channel, and the middle row of holes among the three rows of holes is selected to make the grounding holes.

[0039] Embodiment 5 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above-mentioned embodiment 1 lies in the implementation of the shielding conductor. In this embodiment, Figure 8 、 Figure 9 After through holes are processed on the cable, conductor wires 6 are wound around a row of through holes, and one end of the conductor wire 6 passes through each through hole in the same row from beginning to end, so that the conductor wire 6 is wound around the corresponding row of through holes. A row of through holes can correspond to one conductor wire, and the wire diameter of the conductor wire is adapted to the aperture of the through hole. The conductor wire has parts that are close to the shielding layers on both sides in the thickness direction of the cable and parts that are installed in the through hole. The parts installed in the through hole constitute the shielding conductor.

[0040] The conductor wire can be made of thinner metal wire or conductive fiber, which is woven through the upper and lower shielding layers in a similar sewing manner. The metal wire or conductive fiber is in reliable contact with the upper and lower shielding layers, and the connection can be further reinforced.

[0041] Embodiment 6 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above embodiment 5 lies in the implementation of the shielding conductor. In the above embodiment 5, a row of through holes is provided with a conductor wire. In this embodiment, Figure 10 、 Figure 11 Two conductor wires 6 are installed in the same row of through holes. The two conductor wires 6 are fixedly connected to the shielding layer, and the two conductor wires are respectively tightly attached to the shielding layers on both sides of the cable thickness direction. The conductor wire has a folded portion extending into the through hole. The folded portion is bent in the through hole and does not completely pass through the through hole. When it extends to the halfway position, the folded portions of the two conductor wires in the same through hole are hooked with each other, that is, the portions of the two conductor wires in the same through hole are cross-connected with each other and woven in a similar way to sewing. The portions of the two conductor wires in the same through hole are used to form a shielding conductor, which is a relatively economical way to form a shielding conductor with conductor wires. Compared with the single winding method, this method of tightly sewing and weaving two conductor wires on both sides can achieve a crosstalk index that is 5-10dB higher.

[0042] Embodiment 7 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above-mentioned embodiment 1 lies in the implementation of the shielding conductor. In this embodiment, Figure 12 、 Figure 13 After processing the through hole on the cable, a riveted conductor is installed in the through hole. The shielding conductor 4 is a riveted conductor installed in the through hole. The riveted conductor is a cylinder or a round tube. The two ends of the riveted conductor are riveted on the upper and lower shielding layers respectively.

[0043] In this embodiment, a round tube is used. A bottom hole is obtained by laser drilling, physical drilling, or punching. After a conductive round tube is inserted into the hole, both ends of the round tube are riveted to ensure reliable contact between the two ends of the round tube and the upper and lower shielding layers.

[0044] Embodiment 8 of the flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The difference between this embodiment and the above-mentioned embodiment 4 is that the signal transmission conductor is combined with Figure 14 The cable in this embodiment is used to transmit single-ended signals. One signal transmission conductor 1 is just one wire. The row of grounding holes 40 between two adjacent wires acts as a shield, which can reduce the interference between two adjacent single-ended signal transmission channels, solve the isolation problem between multiple channels of multi-channel single-ended signal RF transmission, and improve high-frequency transmission capabilities.

[0045] Embodiments of the method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capability of the present invention: The structure of a flexible flat cable with multi-channel crosstalk suppression capabilities can be seen in the above-mentioned embodiments. A method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capabilities includes: after securing each signal transmission conductor, insulator, and shielding layer, forming a through-hole between two adjacent signal transmission conductors in the cable. A shielding conductor is disposed within the through-hole and electrically connected to the shielding layers on both sides of the cable thickness direction, thereby reducing interference between different signal paths. The implementation and functional principles of the shielding conductor are described in the above-mentioned embodiments of the flexible flat cable with multi-channel crosstalk suppression capabilities and will not be further described here.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A flexible flat cable with multi-channel crosstalk suppression capability, comprising an insulator (2) and two or more signal transmission conductors (1) located in the insulator (2), wherein a shielding layer is provided on at least two sides in the thickness direction of the cable, and the signal transmission conductors (1) are arranged side by side in the width direction of the cable, wherein: At least one row of shielding conductors (4) is provided between two adjacent signal transmission conductors (1) in the cable. The shielding conductors (4) in the same row are arranged at intervals along the length direction of the cable. The shielding conductors (4) extend along the thickness direction of the cable and are conductively connected to the shielding layers on both sides in the thickness direction of the cable.

2. The flexible flat cable with multi-channel crosstalk suppression capability according to claim 1, wherein: A through hole is provided between two adjacent signal transmission conductors (1) on the cable, which passes through the cable in the thickness direction. The through hole is formed by punching holes in the shielding layer and the insulator. The shielding conductor (4) is a conductor layer attached to the hole wall of the through hole.

3. The flexible flat cable with multi-channel crosstalk suppression capability according to claim 2, wherein: The through hole is filled with a filling medium (5) for reinforcing the conductor layer, and the filling medium is an insulating medium or a conductive medium.

4. The flexible flat cable with multi-channel crosstalk suppression capability according to claim 1, wherein: A through hole is provided between two adjacent signal transmission conductors (1) on the cable, which passes through the cable in the thickness direction. The through holes are arranged in a row along the length direction of the cable. The cable is provided with a conductor wire (6) passing through a corresponding row of through holes. The conductor wire has a portion closely attached to the shielding layer on both sides in the thickness direction of the cable. The shielding conductor (4) is the portion of the conductor wire that is installed in the through hole.

5. The flexible flat cable with multi-channel crosstalk suppression capability according to claim 1, wherein: A through hole is provided between two adjacent signal transmission conductors (1) on the cable, which passes through the cable in the thickness direction. The through holes are arranged in a row along the length direction of the cable. Two conductor threads (6) are installed in the same row of through holes. The two conductor threads are respectively tightly attached to the shielding layers on both sides of the cable in the thickness direction. The shielding conductor (4) is the portion of the conductor thread extending into the through hole. The portions of the two conductor threads in the same through hole are bent and hooked with each other.

6. The flexible flat cable with multi-channel crosstalk suppression capability according to claim 1, wherein: A through hole is provided between two adjacent signal transmission conductors (1) on the cable, which passes through the cable in the thickness direction. The shielding conductor (4) is a riveted conductor installed in the through hole. The riveted conductor is a cylinder or a round tube, and both ends of the riveted conductor are riveted onto the shielding layer.

7. The flexible flat cable with multi-channel crosstalk suppression capability according to any one of claims 1 to 6, characterized in that: A row of shielded conductors (4) is provided on both sides of each signal transmission conductor (1), and a plurality of shielded conductors (4) are provided in the same row along the length direction of the cable. No shielding layer is provided on both sides of the cable in the width direction.

8. The flexible flat cable with multi-channel crosstalk suppression capability according to any one of claims 1 to 6, wherein: The shielding conductors (4) between two adjacent signal transmission conductors (1) are provided in two or more rows along the width direction of the cable, and the shielding conductors (4) of two adjacent rows are staggered.

9. The flexible flat cable with multi-channel crosstalk suppression capability according to any one of claims 1 to 6, wherein: The insulator (2) is provided with air holes distributed at intervals along the length direction of the cable, and the air holes extend along the thickness direction of the cable.

10. A method for manufacturing a flexible flat cable with multi-channel crosstalk suppression capability, characterized in that: After each signal transmission conductor (1), insulator (2) and shielding layer are fixed, a through hole is processed between two adjacent signal transmission conductors (1) of the cable, a shielding conductor (4) is arranged in the through hole, and the shielding conductor (4) is conductively connected to the shielding layers on both sides in the thickness direction of the cable, thereby producing a flexible flat cable with multi-channel crosstalk suppression capability as described in any one of claims 1 to 9 above.

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