Electrical connection assembly

Abstract

This invention discloses an electrical connection assembly, comprising: a first connector; a second connector; and two pairs of wire cores connected between the first connector and the second connector and arranged adjacent to each other. In one pair of wire cores, the polarity arrangement of the first and second wire cores at a first end is opposite to that at a second end, while in the other pair of wire cores, the polarity arrangement of the first and second wire cores at the first end is the same as that at the second end. This application can reduce the far-end crosstalk of the electrical connection assembly, especially exhibiting excellent far-end crosstalk characteristics at high frequencies. Simultaneously, the flexibility of the first and second wire cores allows for easy polarity interchange, greatly simplifying the manufacturing process without affecting the design and molding difficulty of the first and second connectors.

Description

Technical Field

[0001] This invention relates to an electrical connection component, and more particularly to an electrical connection component that improves far-end crosstalk. Background Technology

[0002] Conventional electrical connection systems consist of two connectors that transmit signals to each other. As a signal travels from one connector to the other, the transmission path is subject to far-end crosstalk (FEXT) from surrounding interference sources, and this FEXT gradually accumulates and increases with signal transmission. To reduce far-end interference on connectors, the industry typically focuses on the connector's terminal structure, for example:

[0003] For two pairs of adjacent differential terminals in a connector, the positive and negative signal terminals in one pair are interleaved, and their relative positions are swapped to reverse polarity. The other pair of differential terminals is not interleaved. This polarity reversal cancels out the preceding far-end crosstalk with the subsequent far-end crosstalk of opposite phase, thus reducing the overall far-end crosstalk. However, to avoid contact, in addition to the original width spacing, the positive and negative signal terminals need additional height spacing to cross over each other. This requires a large space, affecting the internal space layout of the connector and increasing the molding difficulty of the positive and negative signal terminals. At the same time, the transmission path of the interleaved pair of differential terminals is longer than that of the uninterleaved pair. To reduce the transmission time difference between the two pairs of differential terminals, the uninterleaved pair needs to have a bend added to extend the transmission path and compensate for the transmission time lag, which also increases the molding difficulty of the other pair of differential terminals.

[0004] Alternatively, the coupling effect between a pair of differential terminals can be increased through the structure of the differential terminals. Adjusting the ratio of self-inductance to mutual inductance, and the ratio of self-capacitance to mutual capacitance, can improve far-end crosstalk. These structural designs significantly affect the impedance of the differential terminals and increase the design and molding complexity of the connector.

[0005] Therefore, it is necessary to design a new electrical connection component to overcome the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an electrical connection component that, through the opposite polarity arrangement of a pair of first and second cores at the first end and the second end, and the same polarity arrangement at the first and second ends of another pair of first and second cores, cancels out the far-end crosstalk at the first and second ends, thereby reducing the far-end crosstalk of the electrical connection component, especially exhibiting excellent far-end crosstalk characteristics at high frequencies. Simultaneously, the flexibility of the first and second cores allows for easy polarity interchange, greatly simplifying the manufacturing process without affecting the design and molding difficulty of the first and second connectors.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an electrical connection assembly, comprising: a first connector; a second connector; two adjacent cable groups, including a first cable group and a second cable group, connected between the first connector and the second connector, each cable group comprising a pair of first and second cores for transmitting differential signals, and a shielding layer surrounding the first and second cores, wherein the first core, the second core, and the shielding layer are electrically isolated, the first core is used to transmit a signal of a first polarity, and the second core is used to transmit a signal of a second polarity, the first polarity and the second polarity being opposite; for each cable group, the first end of the first core and the first end of the second core are adjacent and both connected to the first connector, and the second end of the first core and the second core are adjacent and both connected to the second connector; the first cable... The relative physical positions of the first and second cores in the first cable group are interchanged along the transmission path, and the polarity arrangement of the first and second cores at the first end is opposite to that at the second end; while the polarity arrangement of the first and second cores in the second cable group is the same as that at the second end; the polarity arrangement of the first and second cores in the first end of the two cable groups is, in sequence: first polarity, second polarity, first polarity, and second polarity, and the polarity arrangement at the second end is, in sequence: second polarity, first polarity, first polarity, and second polarity; the first cable group has at least one holding section and at least one twisting section, in which the relative physical positions of the first and second cores in the first cable group remain unchanged, and in which the relative physical positions of the first and second cores in the first cable group are interchanged.

[0008] Furthermore, the first cable assembly includes at least one insulating material covering the outside of the first core and the outside of the second core, the first core and the second core being spaced apart by the insulating material and maintaining a constant spacing distance, and the shielding layer being located outside the insulating material; the relative physical positions between the first core and the second core of the second cable assembly remain unchanged along the transmission path.

[0009] Furthermore, the first cable group is provided with a positioning part, which is located near the first end of the first cable group, so that when an operating body is relatively fixed at the second end, it can drive the positioning part to twist the first cable group.

[0010] Furthermore, the first cable assembly includes a first insulating material covering the outside of the first conductor and a second insulating material covering the outside of the second conductor. The first conductor and the first insulating material constitute a first conductor, and the second conductor and the second insulating material constitute a second conductor. The shielding layer covers the outside of the first conductor and the second conductor. The first conductor and the second conductor have an exposed portion near the first end or the second end. The exposed portion is located outside the shielding layer. The exposed portion of the first conductor and the exposed portion of the second conductor intersect each other, so that the relative physical positions of the first conductor and the second conductor are interchanged.

[0011] Furthermore, the first connector is a circuit board having two pairs of differential signal channels for connecting to the two cable groups respectively, each pair of differential signal channels including a first channel and a second channel; wherein the relative physical positions of the first channel and the second channel of one pair of differential signal channels are interchanged on the transmission path to switch the polarity arrangement of the first channel and the second channel; the relative physical positions of the first channel and the second channel of the other pair of differential signal channels remain unchanged on the transmission path.

[0012] To achieve the above objectives, the present invention also adopts the following technical solution: an electrical connection assembly, comprising: a first connector; a second connector; two pairs of differential conductors arranged adjacently, including a first pair of differential conductors and a second pair of differential conductors, connected between the first connector and the second connector, each pair of differential conductors including a first core and a second core arranged adjacently, the first core being used to transmit a signal of a first polarity, and the second core being used to transmit a signal of a second polarity, the first polarity and the second polarity being opposite; the polarity arrangement of the first core and the second core of the first pair of differential conductors at the first end is opposite to the polarity arrangement at the second end; while the polarity arrangement of the first core and the second core of the second pair of differential conductors at the first end is the same as the polarity arrangement at the second end; the first pair of differential conductors is provided with at least one holding section and at least one twisting section, the relative physical position between the first core and the second core of the first pair of differential conductors remains unchanged in the holding section, and the relative physical position between the first core and the second core of the first pair of differential conductors is interchanged in the twisting section.

[0013] Furthermore, the relative physical positions between the first and second cores of the second pair of differential conductors remain unchanged along the transmission path.

[0014] Furthermore, the first connector is a circuit board, which has two pairs of differential signal channels for connecting to the two pairs of differential wires respectively. Each pair of differential signal channels includes a first channel and a second channel connected to the first wire core and the second wire core of the corresponding pair of differential wires respectively. The relative physical positions of the first channel and the second channel of one pair of differential signal channels are interchanged on the transmission path to switch the polarity arrangement of the first channel and the second channel. The relative physical positions of the first channel and the second channel of the other pair of differential signal channels remain unchanged on the transmission path.

[0015] Furthermore, the first pair of differential conductors is provided with a positioning part, which is located near the first end of the first pair of differential conductors, so that when an operating body is relatively fixed at the second end, the positioning part can be driven to rotate the first pair of differential conductors only once, so that the polarity arrangement of the first core and the second core of the first pair of differential conductors at the first end is opposite to that at the second end, and the first core and the second core of the first pair of differential conductors extend in a straight line as a whole.

[0016] Compared with the prior art, the electrical connection component provided by the present invention has the following advantages:

[0017] By swapping the polarity of the two ends of one pair of first and second wire cores while keeping the polarity of the two ends of the other pair of first and second wire cores unchanged, the far-end crosstalk emitted from the first end of one cable group to the second end of another cable group and the far-end crosstalk emitted from the second end of one cable group to the first end of another cable group can cancel each other out. As a result, the far-end crosstalk experienced by the whole along the entire path formed by the first connector, the cable group and the second connector is reduced, and the mutual crosstalk between the first connector and the second connector is reduced. In particular, the far-end crosstalk characteristics at high frequencies are still excellent. This application utilizes the flexibility of cable assemblies or conductors to easily achieve polarity interchange, greatly simplifying the manufacturing process. Furthermore, it can be implemented even when the lengths of the first and second cores in different pairs are the same, avoiding the problem of large transmission time differences for different pairs of differential signals. Simultaneously, the insulating material between the first and second cores allows for spacing between them, eliminating the need for additional width or height space to achieve relative physical position interchangeability without affecting the design and molding difficulty of the first and second connectors. Moreover, since the cable assembly of the electrical connection component includes a shielding layer, this layer can shield the cable assembly from external interference, preventing the accumulation and increase of far-end crosstalk within the shielded area of ​​the cable assembly, further reducing the overall far-end crosstalk experienced by the electrical connection component.

[0018] Furthermore, the above-mentioned technical solutions and effects of this application are unexpected by those skilled in the art, for the following reasons:

[0019] First, for manufacturers designing and producing electrical connection components, the cable assemblies or conductors for these components are typically purchased directly from other manufacturers specializing in the design and production of such assemblies or conductors. This allows for the interconnection of the first and second connectors in the downstream stages of the electrical connection component manufacturing process. Therefore, when manufacturers designing and producing these electrical connection components need to optimize their far-end crosstalk characteristics, they often focus solely on improving the first or second connector, which they themselves design and manufacture, neglecting to consider improvements made to the cable assemblies or conductors already designed and manufactured by other manufacturers.

[0020] Secondly, in the design and manufacturing process of electrical connection components, connecting the first and second connectors via cable assemblies or wires is a downstream stage in both the overall product design and manufacturing process. Specifically, during the design process, industry technicians typically first design the relevant structures of the first and second connectors. When conducting simulation tests, considering the signal loss on the cable assemblies or wires, technicians will add the signal loss amount of the cable assemblies or wires to the models of the first and second connectors to build an overall simulation model for performance simulation testing. However, since the length and product characteristics of the cable assemblies or wires are already determined, and the product characteristics have been tested and evaluated by other manufacturers, technicians will continue to improve the first and second connectors if the performance of the electrical connection components does not meet the requirements. In the manufacturing process, the connection step is generally at the final stage of the electrical connection component's production process, serving as the final connection. Since the performance of the electrical connection component needs to be determined before production, industry technicians will not address far-end crosstalk only at the final stage of the manufacturing process. Therefore, for cable assemblies and conductors, industry professionals typically focus on the connection devices during design and use. When the far-end crosstalk characteristics of electrical connection components need improvement, they usually concentrate on the structural design of the first and second connectors, neglecting to improve the cable assemblies or conductors originally used for connection. This is why the industry often improves far-end crosstalk by addressing the terminal structure and shielding structure of the first or second connector.

[0021] Third, when using polarity reversal to improve far-end crosstalk, it is necessary to interchange the positions of the two intersecting transmission paths while maintaining their intersecting state. Therefore, industry professionals typically focus on setting the two intersecting transmission paths on rigid or fixed-position components, such as terminals or intermediate circuit boards connecting the first and second connectors. This leverages the rigidity of the terminal material or the fixed position of the signal channels on the intermediate circuit board to create two transmission paths that maintain their intersecting state. Industry professionals find it difficult to conceive of implementing polarity reversal on flexible, versatile cable assemblies or conductors.

[0022] In summary, the inventors of this application have broken through the conventional design thinking of industry technicians and innovatively optimized the cable group or conductor to improve the far-end crosstalk between the first connector and the second connector. Furthermore, the simulation results of the technical solution of this application show that the technical solution of this application has a significant improvement on the far-end crosstalk of the electrical connection component. Attached Figure Description

[0023] Figure 1 This is a perspective view of the electrical connection assembly provided in the first embodiment of the present invention;

[0024] Figure 2 A plan view of the electrical connection assembly provided in the first embodiment of the present invention;

[0025] Figure 3 for Figure 3 Enlarged view of section A;

[0026] Figure 4 This is a partial three-dimensional schematic diagram of one of the first cable groups provided in the first embodiment of the present invention;

[0027] Figure 5 A perspective view of a first cable group and a second cable group arranged adjacent to each other according to a first embodiment of the present invention;

[0028] Figure 6 This is a simplified schematic diagram of the electrical connection assembly provided in the first embodiment of the present invention;

[0029] Figure 7 This is a partial plan view of the electrical connection assembly provided in the second embodiment of the present invention;

[0030] Figure 8 A perspective view of a first cable group and a second cable group arranged adjacent to each other provided in the third embodiment of the present invention;

[0031] Figure 9 A partial perspective view of the first cable group and the second cable group arranged adjacent to each other provided in the fourth embodiment of the present invention;

[0032] Figure 10 This is a three-dimensional schematic diagram of two pairs of differential wires arranged adjacent to each other in the electrical connection assembly provided in the fifth embodiment of the present invention;

[0033] Figure 11 This is a perspective view of the electrical connection assembly provided in the sixth embodiment of the present invention;

[0034] Figure 12 Simulation test diagram of the far-end crosstalk characteristics of the electrical connection assembly provided by the present invention before the relative physical positions of the first and second wires are interchanged.

[0035] Figure 13 Simulation test diagram of the far-end crosstalk characteristics of the electrical connection component provided by the present invention after the relative physical positions of the first and second wires are interchanged.

[0036] Explanation of reference numerals in the accompanying drawings for the specific implementation methods:

[0037] Detailed Implementation

[0038] To facilitate a better understanding of the purpose, structure, features, and effects of this invention, the invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0039] Please see Figures 1 to 6 The first embodiment of the present invention provides an electrical connection assembly 100, which includes a first connector 1, a second connector 2, and a plurality of cable groups 3 connecting the first connector 1 and the second connector 2. In this embodiment, the first connector 1 and the second connector 2 are both circuit boards. In other embodiments, the first connector 1 may also be a connector or a terminal or terminal module 16 directly riveted to the cable group 3, etc. Similarly, the second connector 2 may also be a connector or a terminal or terminal assembly directly riveted to the cable group 3, etc., and the first connector 1 and the second connector 2 may be different, which is not limited here.

[0040] Please see Figure 1 , Figure 4 and Figure 5 In this embodiment, each cable group 3 includes a first conductor 31 and a second conductor 32 arranged in pairs. The first conductor 31 includes a first insulating material 311 and a first wire core 312, and the second conductor 32 includes a second insulating material 321 and a second wire core 322. Each cable group 3 also includes a third insulating material 33 covering the outside of the first conductor 31 and the second conductor 32, a shielding layer 34 covering the outside of the third insulating material 33, two grounding wires 35 located on both sides of the outside of the shielding layer 34, and a protective sleeve 36 covering the outside of the shielding layer 34 and the two grounding wires 35. Of course, in other embodiments, the multiple cable groups 3 can be different. The cable group 3 may not have the grounding wire 35, or it may not have the grounding wire 35, or it may not have three layers of insulation material but only one layer of insulation material to cover and isolate the first wire core 312 and the second wire core 322 from each other, or it may not have the third insulation material 33, or it may have more layers of insulation material. There is no limitation here, as long as the first wire core 312, the second wire core 322 and the shielding layer 34 can be electrically isolated from each other. In this embodiment, the multiple cable groups 3 are arranged independently and scattered. In other embodiments, in order to better store and organize the electrical connection assembly 100, the middle parts of the multiple cable groups 3 can be fixed in one fixed body at the same time, thereby reducing the mutual entanglement between the multiple cable groups 3.

[0041] Please see Figures 4 to 6The plurality of cable groups 3 include at least two adjacently arranged first cable group 3a and a second cable group 3b. For each of the first cable group 3a and the second cable group 3b, the first wire core 312 and the second wire core 322 are used to transmit differential signals. The first wire core 312 is used to transmit a signal of a first polarity, and the second wire core 322 is used to transmit a signal of a second polarity, wherein the first polarity and the second polarity are opposite. The first end 312a of the first wire core 312 and the first end 322a of the second wire core 322 are adjacently arranged and both connected to the first connector 1. The second end 312b of the first wire core 312 and the second end 322b of the second wire core 322 are adjacently arranged and both connected to the second connector 2. The first conductor 31 and the second conductor 32 of the first cable group 3a are a first pair of differential conductors, and the first conductor 31 and the second conductor 32 of the second cable group 3b are a second pair of differential conductors. In the first cable group 3a, the relative physical positions of the first core 312 and the second core 322 are interchanged on the transmission path. The polarity arrangement of the first core 312 and the second core 322 at the first ends 312a and 322a is opposite to that at the second ends 312b and 322b. In the second cable group 3b, the polarity arrangement of the first core 312 and the second core 322 at the first ends 312a and 322a is the same as that at the second ends 312b and 322b. Thus, the polarity arrangement of the first core 312 and the second core 322 at the first ends 312a and 322a of the two cable groups 3 is, in sequence: first polarity, second polarity, first polarity and second polarity, and the polarity arrangement at the second ends 312b and 322b is, in sequence: second polarity, first polarity, first polarity and second polarity. In this embodiment, the plurality of cable groups 3 include two rows, each row including a plurality of first cable groups 3a and a plurality of second cable groups 3b arranged alternately.

[0042] To better understand, let's consider the positive (+) electrode as the first polarity and the negative (-) electrode as the second polarity. Figure 6The following simplified illustration illustrates that in the first cable group 3a, the polarity arrangement of the first wire core 312 and the second wire core 322 at the first ends 312a and 322a is first polarity (+) and second polarity (-), respectively. The polarity arrangement of the first wire core 312 and the second wire core 322 at the second ends 312b and 322b is second polarity (-) and second polarity (+). Therefore, the polarity arrangement of the first wire core 312 and the second wire core 322 in the first cable group 3a and the first wire core 312 and the second wire core 322 in the second cable group 3b at the first ends 312a and 322a is: first polarity (+), second polarity (-), first polarity (+), second polarity (-), respectively. The polarity arrangement at the second ends 312b and 322b is: second polarity (-), first polarity (+), first polarity (+), second polarity (-), respectively. It should be noted that the positive and negative signals in a pair of differential signals are processed and analyzed as a whole by the subsequent processor, and are not analyzed and processed in isolation. Therefore, even if the positions of the positive and negative signals transmitted by the first cable group 3a in this application are interchanged, it will not affect the subsequent processor's overall processing and analysis of the pair of differential signals, as long as the processor can receive the pair of differential signals at the corresponding two ports.

[0043] The technical solution of this application arranges the polarities of the two ends of one pair of first wire cores 312 and second wire cores 322 in opposite directions, while keeping the polarity arrangement of the two ends of the other pair of first wire cores 312 and second wire cores 322 unchanged. This allows the far-end crosstalk emitted from the first ends 312a and 322a of one cable group 3 to the second ends 312b and 322b of the other cable group 3 and the far-end crosstalk emitted from the second ends 312b and 322b of one cable group 3 to the first ends 312a and 322a of the other cable group 3 to cancel each other out. As a result, the far-end crosstalk experienced by the whole along the overall path formed by the first connector 1, the cable group 3 and the second connector 2 is reduced, the mutual crosstalk between the first connector 1 and the second connector 2 is reduced, and the far-end crosstalk of the electrical connection assembly 100 is improved. In this embodiment, the cable group 3 includes the shielding layer 34. The shielding layer 34 can shield the cable group 3 from external interference, so that the far-end crosstalk in the area covered by the shielding layer 34 in the cable group 3 will not accumulate and increase, and can further reduce the far-end crosstalk received by the electrical connection component 100 as a whole.

[0044] Please see Figure 4 and Figure 5In the first cable group 3a, the first core 312 and the second core 322 are spaced apart by the first insulating material 311 and the second insulating material 321, and the first insulating material 311 and the second insulating material 321 are in close contact to maintain a constant spacing. Therefore, even if the relative physical positions of the first core 312 and the second core 322 in the first cable group 3a are interchanged, the distance between the first core 312 and the second core 322 remains unchanged, resulting in a relatively uniform coupling effect between the first core 312 and the second core 322 at different locations, which is beneficial for differential signal transmission. Furthermore, in this embodiment, the relative physical positions of the first core 312 and the second core 322 in the second cable group 3b remain unchanged along the transmission path; that is, the relative physical positions of the first core 312 and the second core 322 in the second cable group 3b will not be interchanged throughout the entire transmission path. Of course, in other embodiments, the relative physical positions of the first core 312 and the second core 322 of the second cable group 3b can be exchanged multiple times, while maintaining the same polarity arrangement at the first end 312a, 322a and the second end 312b, 322b. For example, the relative physical positions of the first core 312 and the second core 322 of the second cable group 3b can be exchanged an even number of times. This application does not limit the first core 312 and the second core 322 of the second cable group 3b to not exchanging their relative physical positions at all. It should be noted that, compared to the second cable group 3b where the relative physical positions of the first core 312 and the second core 322 are also interchanged, this embodiment ensures that more far-end crosstalk is phase-opposite and of the same magnitude by keeping the polarity arrangement of the first core 312 and the second core 322 of the second cable group 3b unchanged throughout the transmission path. This can cancel out more far-end crosstalk, resulting in less far-end crosstalk ultimately experienced by the electrical connection component 100. In this embodiment, when the first cable group 3a is not twisted, its first core 312 and second core 322 can be parallel twin wires of the first cable group 3a, that is, the first core 312 and the second core 322 are arranged in parallel; of course, when the first cable group 3a is not twisted, its first core 312 and second core 322 can also be twisted twin wires of the first cable group 3a.

[0045] Please see Figure 1 and Figure 5The first cable assembly 3a is twisted along its extended length in a twist section Q2, thereby exchanging the relative physical positions of the first core 312 and the second core 322. The holding sections Q1 located on either side of the twisted section do not twist. Thus, within the holding section Q1, the relative physical positions of the first core 312 and the second core 322 of the first cable assembly 3a remain unchanged, while within the twisted section Q2, the relative physical positions of the first core 312 and the second core 322 of the first cable assembly 3a are exchanged. For ease of observation and understanding... Figure 5 The diagram illustrates the reference line L1 of the first cable group 3a and the reference line L2 of the second cable group 3b. The relative position of reference line L1 in the first cable group 3a is the same as the relative position of reference line L2 in the second cable group 3b. It can be seen that reference line L1 maintains a straight extension in the holding section Q1 on one side of the first cable group 3a. Reference line L1 gradually rotates and shifts in the twisting section Q2 until it is obscured. In contrast, the reference line L2 of the second cable group 3b, without twisting, maintains a straight extension along its entire length and is not obscured. It should be noted that in this embodiment, the twisting section Q2 is located in the middle of the first cable group 3a, while the two holding sections Q1 are located on either side of the twisting section Q2. In other embodiments, the position and number of the holding sections Q1 and the twisting sections Q2 can be set according to actual needs and are not limited here.

[0046] Of course, in other embodiments, the first cable group 3a can suddenly undergo an acute twist at a certain position, or it can gradually twist along the entire length of the first cable group 3a; this is not limited here. To achieve an acute twist at a certain position of the first cable group 3a, the stress of the material properties of the first cable group 3a can be used to maintain this twisted state; alternatively, the twisted state can be maintained by adding a fixing element, such as using tape as a fixing element and wrapping tape around the twisted position, or using an injection molded part as a fixing element and covering and fixing an injection molded part at the twisted position; this is not limited here. Similarly, the twisted state of the twisted section Q2 of the first cable group 3a in the first embodiment can be maintained by using fixing elements such as tape or injection molded parts.

[0047] Please see Figure 2 and Figure 3The first connector 1 is a circuit board, which includes multiple pairs of differential signal channels. Each pair of differential signal channels has two adjacent pairs for connection to the first cable group 3a and the second cable group 3b, respectively. Each pair of differential signal channels includes a first channel 13 and a second channel 14 connected to the corresponding first wire core 312 and second wire core 322, respectively. The first connector 1 also has multiple grounding channels for connection to the grounding wire 35 of the corresponding cable group 3. In this embodiment, the relative physical positions of the first channel 13 and the second channel 14 in each pair of differential signal channels of the first connector 1 remain unchanged. In this embodiment, the second connector 2 is also a circuit board, and its channel design can be found in [reference needed]. Figure 3 The channel design of the first connector 1 shown may be designed into other structures according to actual needs.

[0048] It should be noted that if a 180-degree twist is considered one twist, in order to achieve the opposite polarity arrangement of the first wire core 312 and the second wire core 322 at the first end 312a, 322a and the second end 312b, 322b of the first cable group 3a and the second cable group 3b, the number of twists of the first cable group 3a is odd. However, to minimize the shape change of the first cable group 3a, the number of twists can be reduced.

[0049] Please see Figure 7This is the second embodiment provided in this application. The difference between this embodiment and the first embodiment lies in the channel design of the first connector 1. Specifically, in the second embodiment, the first connector 1 is a circuit board, and the first connector 1 has two pairs of differential signal channels arranged adjacently and used to connect to the first cable group 3a and the second cable group 3b respectively, namely, a first pair of differential signal channels 11 and a second pair of differential signal channels 12. Each pair of differential signal channels includes a first channel 13 and a second channel 14 respectively connected to a corresponding pair of first wire cores 312 and second wire cores 322. The relative physical positions of the first channel 13 and the second channel 14 of the first pair of differential signal channels 11 are interchanged on the transmission path to switch the polarity arrangement of the first channel 13 and the second channel 14; the relative physical positions of the first channel 13 and the second channel 14 of the second pair of differential signal channels 12 remain unchanged on the transmission path. Therefore, in the second embodiment, in addition to swapping the polarity of the first core 312 and the second core 322 of the first cable group 3a, the polarity of the first channel 13 and the second channel 14 in the first pair of differential signal channels 11 of the first connector 1 is further swapped. This reduces far-end crosstalk between two adjacent pairs of differential signal channels inside the first connector 1, thus reducing far-end crosstalk in the electrical connection assembly 100 over a longer signal transmission path. Furthermore, in the second embodiment, the second connector 2 is a circuit board, and its channel design can refer to... Figure 7 By configuring the channel design of the first connector 1, far-end crosstalk between two adjacent pairs of differential signal channels within the first connector 1 can be reduced, far-end crosstalk between adjacent first cable group 3a and second cable group 3b can be reduced, and far-end crosstalk between two adjacent pairs of differential signal channels within the second connector 2 can be reduced, thus reducing far-end crosstalk in different sections of the transmission path of the electrical connection assembly 100. To allow the relative physical positions of the first channel 13 and the second channel 14 of one pair of differential signal channels to be interchanged on the transmission path, the first channel 13 and the second channel 14 need to be arranged within two plating layers through through-holes 15 to avoid contact between the first channel 13 and the second channel 14.

[0050] It should be noted that in other embodiments, when both the first connector 1 and the second connector 2 are circuit boards, only one of the first connector 1 and the second connector 2 may be provided with the first channel 13 and the second channel 14 with reversed polarity, and the first connector 1 and the second connector 2 are not limited to having the same configuration. It should also be noted that the electrical connection component 100 may be a pair of differential signal channels with reversed polarity connected to the first cable group 3a with reversed polarity, and another pair of differential signal channels without reversed polarity connected to the second cable group 3b; alternatively, it may be a pair of differential signal channels with reversed polarity connected to the second cable group 3b, and another pair of differential signal channels without reversed polarity connected to the first cable group 3a with reversed polarity. Those skilled in the art can freely combine and match according to actual needs, and no limitation is made here.

[0051] Please see Figure 8 This is the third embodiment provided in this application. The difference between the third embodiment and the first embodiment is that the first cable group 3a is provided with a positioning part 37. The positioning part 37 is located near the first ends 312a and 322a of the first cable group 3a, so that an operating body can drive the positioning part 37 to twist the first cable group 3a when the second ends 312b and 322b are relatively fixed. It should be noted that since the first cable group 3a is twisted when the second ends 312b and 322b are relatively fixed and the first ends 312a and 322a are driven by the operating body, the first cable group 3a can be twisted as a whole. The twisting angle of the first cable group 3a can be gradually changed along the length of the first cable group 3a, so that the polarity arrangement of the first core 312 and the second core 322 of the first cable group 3a at the first ends 312a and 322a and the second ends 312b and 322b is opposite, rather than being completed by acute twisting at a specific position. The operating body can be the hand of an operator or a mechanical tool, etc. To facilitate observation and understanding, Figure 8 The diagram illustrates the reference line L3 of the first cable group 3a and the reference line L4 of the second cable group 3b. The relative position of reference line L3 in the first cable group 3a is the same as the relative position of reference line L4 in the second cable group 3b. It can be seen that the first cable group 3a gradually twists along its entire length, and its reference line L3 gradually rotates and shifts along its entire length until it is obscured. In contrast, the second cable group 3b does not twist, and its reference line L4 remains straight and unobstructed along its entire length.

[0052] If the first cable group 3a is abruptly twisted at a certain position to reverse the polarity arrangement of the first ends 312a, 322a and the second ends 312b, 322b, the first core 312 and the second core 322 will experience a significant abrupt change in shape. This will cause substantial signal reflection at the shape change point, resulting in significant signal loss. Furthermore, the abrupt twist will exert strong pressure on the insulation material between the first core 312 and the second core 322, causing deformation and making it difficult to maintain the spacing between them along the transmission path, which is detrimental to differential signal transmission. However, regardless of whether it's the abrupt twist implementation or the implementation where only a portion is selected as the twist section Q2 as in the first embodiment, the first cable group 3a in this embodiment can rotate gradually along its entire length, with a smaller twist angle per unit length. This allows the shapes of the first core 312 and the second core 322 to change slowly, reducing signal reflection caused by abrupt shape changes, thereby reducing signal loss and facilitating differential signal transmission. Furthermore, the first cable group 3a extends substantially in a straight line along its overall length, avoiding excessive compensation of its original length in the extension direction to the width direction for rapid twisting. This prevents the distance from the first end 312a, 322a to the second end 312b, 322b from the twisted cable group 3a from being too short, which could make it difficult to connect the first cable group 3a to the first connector 1 or the second connector 2. In this embodiment, the first cable group 3a twists only once. Figure 8 As can be seen, the first cable group 3a extends in a generally straight line, and the length of the first cable group 3a changes very little compared with the untwisted state. At the same time, there are no positions where the first wire core 312 and the second wire core 322 are significantly twisted or deformed.

[0053] Please see Figure 9This is the fourth embodiment provided in this application. The difference between the fourth embodiment and the first embodiment is that the first conductor 31 and the second conductor 32 have an exposed portion 38 near the first end 312a, 322a or the second end 312b, 322b. The exposed portion 38 is located outside the shielding layer 34. The exposed portion 38 of the first conductor 31 and the exposed portion 38 of the second conductor 32 intersect each other, so that the relative physical positions between the first conductor 312 and the second conductor 322 are interchanged. Compared to the first and third embodiments, where the polarity is reversed over a longer area, making it difficult to observe the number of reversals, this embodiment places the polarity reversal at the exposed portion 38, close to the first ends 312a, 322a or the second ends 312b, 322b. This facilitates the observation and inspection of the number of times the relative physical positions of the first conductor 312 and the second conductor 322 are reversed, avoiding the possibility that an even number of reversals would prevent the polarity arrangement of the first cable group 3a and the second cable group 3b at the first ends 312a, 322a and the second ends 312b, 322b from being reversed. Furthermore, to maintain the relative physical position reversal of the first conductor 31 and the second conductor 32, this embodiment also includes a fixing sleeve 39 fitted onto the outside of the exposed portion 38. Of course, in other embodiments, the fixing sleeve 39 may not be provided. Technicians can simultaneously interchange the positions of the first wire core 312 and the second wire core 322 while connecting the first end 312a, 322a or the second end 312b, 322b to the first connector 1 or the second connector 2. In the fourth embodiment, the first conductor 31 has multiple coaxial cores to collectively form the first wire core 312, and the second conductor 32 has multiple coaxial cores to collectively form the second wire core 322.

[0054] Please see Figure 10This is the fifth embodiment provided in this application, which differs from the first embodiment in that the outer side of the first conductor 31 and the outer side of the second conductor 32 are no longer provided with a third insulating material 33, a shielding layer 34, a protective sleeve 36, etc. That is, the electrical connection assembly 100 in the fifth embodiment includes a first connector 1, a second connector 2, and a plurality of conductors connected between the first connector 1 and the second connector 2. Among the plurality of conductors, there are two pairs of differential conductors arranged adjacent to each other. Each pair of differential conductors includes a first conductor 31 and a second conductor 32 arranged adjacent to each other for transmitting differential signals. The first conductor 31 includes a first core 312 for transmitting a first polarity signal and a first insulating material 311 covering the outside of the first core 312. The second conductor 32 includes a second core 322 for transmitting a second polarity signal and a second insulating material 321 covering the outside of the second core 322.

[0055] In the fifth embodiment, for two adjacent pairs of differential conductors (i.e., the first pair of differential conductors and the second pair of differential conductors), the polarity arrangement of the first core 312 and the second core 322 of the first pair of differential conductors at the first ends 312a and 322a is opposite to that at the second ends 312b and 322b; while the polarity arrangement of the first core 312 and the second core 322 of the second pair of differential conductors at the first ends 312a and 322a is the same as that at the second ends 312b and 322b. Even if the two pairs of differential conductors do not have a shielding layer 34, the first core 312 and the second core 322 will be subject to far-end crosstalk from the first connector 1 or the second connector 2 on the transmission path. However, since the polarity of the first core 312 and the second core 322 of the first pair of differential conductors is interchanged, the far-end crosstalk will also have a superposition and mutual cancellation part, which can also reduce the overall far-end crosstalk received by the electrical connection assembly 100.

[0056] Furthermore, a positioning part 37 is provided on the first pair of differential conductors. The positioning part 37 is located near the first ends 312a and 322a of the first pair of differential conductors. This allows an operating body to rotate the positioning part 37 when the second ends 312b and 322b are relatively fixed, so that the polarity arrangement of the first core 312 and the second core 322 of the first pair of differential conductors at the first ends 312a and 322a is opposite to the polarity arrangement at the second ends 312b and 322b. The positioning part 37 of the first pair of differential conductors can be provided on both the first conductor 31 and the second conductor 32, or it can be provided on only one of the first conductor 31 and the second conductor 32. This also avoids acute twisting of the first pair of differential conductors and reduces signal reflection caused by abrupt changes in the shape of the first pair of differential conductors. Furthermore, the first pair of differential conductors twists only once under the action of the operating body, and the first conductor 312 and the second conductor 322 extend in a straight line as a whole, which can further reduce the twist angle of the first pair of differential conductors per unit length and reduce the shape change of the first pair of differential conductors.

[0057] Please see Figure 11 This is the sixth embodiment provided in this application. The difference between the sixth embodiment and the first embodiment is that the first connector 1 and the second connector 2 are not circuit boards, but rather electrical modules including multiple terminal modules 16. When multiple electrical modules are arranged in a single arrangement, they can form a backplane connector. Both the first connector 1 and the second connector 2 are provided with multiple terminal modules 16. Each terminal module 16 includes a pair of differential terminals, and each pair of differential terminals is connected to the first wire core 312 and the second wire core 322 corresponding to a cable group 3. Of course, in other embodiments, the first connector 1 and the second connector 2 can be other forms of backplane connectors or other types of connectors, which are not limited here.

[0058] To better understand the technical effects achieved by the technical solution of this application, please refer to... Figure 12 and Figure 13 These are simulation test diagrams showing the relative physical positions between the first wire core 312 and the second wire core 322 in the first cable group 3a of the electrical connection assembly 100 before and after the interchange. Figure 12 and Figure 13 The horizontal axis represents frequency, and the vertical axis represents the magnitude of far-end crosstalk. From Figure 12It can be seen that before the interchange, although the far-end crosstalk characteristics of the electrical connection component 100 met the PCIe 5.0 specification, the test lines were very close to the PCIe 5.0 specification lines. If the actual operating environment of the electrical connection component 100 was poor, it might not meet the PCIe 5.0 specification. Furthermore, at frequencies above 3GHz, the far-end crosstalk characteristics of the electrical connection component 100 did not meet the PCIe 6.0 specification, making it difficult to use in high-frequency transmission scenarios. Figure 13 It can be seen that, by applying the technical solution of this application, the far-end crosstalk performance of the electrical connection component 100 simultaneously meets and far exceeds the PCIe 5.0 and PCIe 6.0 specifications. Even in harsh environments where the electrical connection component 100 is actually used, its far-end crosstalk characteristics still meet the PCIe 5.0 and PCIe 6.0 specifications. Especially at high frequencies, the far-end crosstalk characteristics of the electrical connection component 100 also exhibit excellent performance. Furthermore, compared to… Figure 12 and Figure 13 At a frequency of 10 GHz, applying the technical solution of this application can reduce far-end crosstalk from approximately -46 dB to approximately -65 dB; at a frequency of 20 GHz, applying the technical solution of this application can reduce far-end crosstalk from approximately -43 dB to approximately -68 dB; and at a frequency of 30 GHz, applying the technical solution of this application can reduce far-end crosstalk from approximately -38 dB to approximately -59 dB. It is evident that the technical solution of this application can significantly reduce the far-end crosstalk experienced by the electrical connection component 100.

[0059] It should be noted that if the polarity of the differential terminals of the connector is interchanged by crossing them, the pair of intersecting differential terminals in this technical solution needs to occupy a large space in both height and width to prevent the two terminals of the pair from contacting each other. Especially since the connector itself is a relatively small component, this space occupation has a significant impact on the spatial arrangement of the connector. In addition, since the terminals are rigid, in order to make two of the terminals intersecte, a part of one terminal needs to be bent and extended at an angle towards the other terminal, which increases the difficulty of terminal forming. At the same time, the angled extension increases the transmission path of the terminals, making the pair of intersecting differential terminals more difficult to connect than the other pair of non-intersecting differential terminals. The long transmission path of the differential terminals leads to a significant time difference between different pairs of differential terminals, affecting the signal transmission of the connector. This is especially true for signals requiring high-speed transmission, where the requirements for the time difference between different pairs of differential terminals are even more stringent. Even a slight increase in time difference can prevent the processor from processing the signal correctly. Furthermore, to reduce the time difference between different pairs of differential terminals, the length of the other pair of differential terminals that are not cross-connected needs to be extended accordingly, for example, by adding a bend. This increases the difficulty of terminal forming. At the same time, the increased impedance at the bends of both pairs of differential terminals further challenges the impedance consistency of all differential terminals within the connector. Therefore, this technical solution improves the far-end crosstalk between two pairs of differential terminals within the connector, and it has a significant impact on the terminal forming difficulty, internal space arrangement, terminal impedance, and transmission time difference between different differential pairs, greatly increasing the design complexity of the connector. However, the technical solution of this application can interchange the phase physical positions of the first core 312 and the second core 322 of one pair of adjacent differential signal wires or two pairs of cable groups 3, and connect them to the first connector 1 and the second connector 2. This can improve the far-end crosstalk between the first connector 1 and the second connector 2, and can achieve the effect of improving far-end crosstalk without affecting the internal spatial arrangement of the first connector 1 and the second connector 2. By utilizing the flexibility of the cable group 3 or the wire, polarity interchange can be easily achieved, greatly simplifying the production process. Moreover, the technical solution of this application can be implemented when the lengths of different pairs of first cores 312 and second cores 322 are the same, avoiding the problem of large transmission time differences between different pairs of differential signals. At the same time, since the first core 312 and the second core 322 are isolated by insulating material, the interchange of the relative physical positions between the first core 312 and the second core 322 can be achieved without adding extra space.

[0060] Furthermore, if the first connector 1 and the second connector 2 are interconnected via an intermediate circuit board, and a similar feature is provided on the intermediate circuit board... Figure 7 The channel design shown is used to improve far-end crosstalk between the first connector 1 and the second connector 2. However, this technical solution also suffers from the disadvantages of the aforementioned technical solution that improves far-end crosstalk by having two terminals cross each other. In addition, this technical solution requires special channel design for the intermediate circuit boards of different sizes. Moreover, since the polarity reversal of the differential signal channel in the intermediate circuit board requires at least two plating layers and through-holes for layer penetration design, these will occupy the internal space of the intermediate circuit board, increase the design difficulty of the intermediate circuit board, and increase the manufacturing process and production cost of the intermediate circuit board. This is especially true for the design and production of intermediate circuit boards for multilayer boards, where the design difficulty, production difficulty, and production cost are all very high. Compared to the previous technical solution, this application utilizes the cable group 3 or conductor that originally served as a connector to improve far-end crosstalk. The cable group 3 or conductor located between the first connector 1 and the second connector 2 can be flexibly placed in space and can be directly used for electrical connection components 100 of different lengths. It has little impact on the spatial layout and arrangement of the conductor or cable group 3 itself. Moreover, the original flexibility of the cable group 3 or conductor allows for the interchange of the relative physical positions of the corresponding pair of first cores 312 and second cores 322. The technical solution of this application is easy to implement and has minimal impact on the design difficulty and production cost of the electrical connection component 100.

[0061] Furthermore, in the intermediate circuit board, considering the spacing between the two signal channels in a pair of differential signal channels and the process precision, the distance between the two signal channels is at least 0.4mm. In contrast, there is insulating material between the first wire core 312 and the second wire core 322 in a pair of differential conductors, and the spacing can be as low as 0.25mm. Therefore, compared with improving the far-end crosstalk between the first connector 1 and the second connector 2 through the intermediate circuit board, the technical solution of this application can relatively reduce the distance between differential signals, which is beneficial to the mutual coupling and transmission of differential signals.

[0062] In summary, the electrical connection assembly 100 of the present invention has the following beneficial effects:

[0063] 1. The far-end crosstalk of the electrical connection component 100 is improved, especially the far-end crosstalk characteristics at high frequencies are still excellent; at the same time, the polarity can be easily interchanged by utilizing the flexibility of the first wire core 312 and the second wire core 322, which greatly simplifies the production process and does not affect the design and molding difficulty of the first connector 1 and the second connector 2.

[0064] 2. The first connector 1 is a circuit board, wherein the relative physical positions of the first channel 13 and the second channel 14 of the pair of differential signal channels are interchanged on the transmission path to switch the polarity arrangement of the first channel 13 and the second channel 14, which can reduce the far-end crosstalk between the two pairs of adjacent differential signal channels inside the first connector 1, so that the electrical connection component 100 reduces far-end crosstalk on a longer signal transmission path.

[0065] 3. The first cable group 3a is twisted by the operation body driven by the second ends 312b and 322b being relatively fixed. This allows the first cable group 3a to twist as a whole, and the twist angle of the first cable group 3a can be gradually changed along the length of the first cable group 3a. This causes the shapes of the first wire core 312 and the second wire core 322 to change slowly, reducing signal reflection caused by abrupt shape changes, thereby reducing signal loss and facilitating the transmission of differential signals.

[0066] The above detailed description is only an illustration of a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Therefore, all equivalent technical changes made using the content of this invention's specification and illustrations are included within the patent scope of this invention.

Claims

1. An electrical connection assembly, characterized by The application relates to a cable assembly, comprising: a first connector; a second connector; two cable groups, including a first cable group and a second cable group, connected between the first connector and the second connector, each cable group comprising a first wire core and a second wire core arranged in pairs and used for transmitting differential signals, and a shielding layer surrounding the first wire core and the second wire core, the first wire core, the second wire core and the shielding layer being electrically isolated, the first wire core being used for transmitting signals of a first polarity, and the second wire core being used for transmitting signals of a second polarity, the first polarity and the second polarity being opposite; for each cable group, a first end of the first wire core and a first end of the second wire core are arranged adjacently and connected to the first connector, and a second end of the first wire core and a second end of the second wire core are arranged adjacently and connected to the second connector; the relative physical positions between the first wire core and the second wire core of the first cable group are exchanged in a transmission path, and the polarity arrangement of the first wire core and the second wire core at the first end is opposite to that at the second end; and the polarity arrangement of the first wire core and the second wire core at the first end of the second cable group is the same as that at the second end; the polarity arrangement of the first wire core and the second wire core of the two cable groups at the first end is in turn: the first polarity, the second polarity, the first polarity and the second polarity, and the polarity arrangement at the second end is in turn: the second polarity, the first polarity, the first polarity and the second polarity; the first cable group is provided with at least one maintaining section and at least one twisting section, the relative physical positions between the first wire core and the second wire core of the first cable group remain unchanged in the maintaining section, and the relative physical positions between the first wire core and the second wire core of the first cable group are exchanged in the twisting section.

2. An electrical connection assembly as claimed in claim 1, wherein, the first cable group comprises at least one insulating material covering the outer sides of the first wire core and the second wire core, the first wire core and the second wire core are spaced from each other by the insulating material and maintain a constant spacing distance, and the shielding layer is located outside the insulating material; the relative physical positions between the first wire core and the second wire core of the second cable group remain unchanged in a transmission path.

3. The electrical connection assembly of claim 1, wherein, the first cable group is provided with a positioning part, the positioning part is located at a position adjacent to the first end of the first cable group, and an operating body drives the positioning part to twist the first cable group when the second end is relatively fixed.

4. The electrical connection assembly of claim 1, wherein, The first cable group includes a first insulating material covering the outside of the first core and a second insulating material covering the outside of the second core, the first core and the first insulating material forming a first conductor, the second core and the second insulating material forming a second conductor, the shielding layer covering the outside of the first conductor and the second conductor, the first conductor and the second conductor being provided with a bare part adjacent to the first end or the second end, the bare part being located outside the shielding layer, the bare part of the first conductor and the bare part of the second conductor being crossed with each other, so that the relative physical positions between the first core and the second core are exchanged.

5. The electrical connection assembly of claim 1, wherein, The first connecting member is a circuit board, and the circuit board has two pairs of differential signal channels for connecting with the two cable groups respectively, each pair of differential signal channels including a first channel and a second channel; The relative physical positions between the first channel and the second channel of one pair of differential signal channels are exchanged in the transmission path to switch the polar arrangement of the first channel and the second channel; the relative physical positions between the first channel and the second channel of another pair of differential signal channels remain unchanged in the transmission path.

6. An electrical connection assembly characterized by It includes: a first connecting member; a second connecting member; two pairs of adjacent differential conductors, including a first pair of differential conductors and a second pair of differential conductors, connected between the first connecting member and the second connecting member, each pair of differential conductors including adjacent first and second cores, the first core being used for transmitting signals of a first polarity, and the second core being used for transmitting signals of a second polarity, the first polarity and the second polarity being opposite; The polar arrangement of the first core and the second core of the first pair of differential conductors at the first end is opposite to that at the second end; and the polar arrangement of the first core and the second core of the second pair of differential conductors at the first end is the same as that at the second end; The first pair of differential conductors is provided with at least one holding section and at least one twisting section, the relative physical positions between the first core and the second core of the first pair of differential conductors remain unchanged in the holding section, and the relative physical positions between the first core and the second core of the first pair of differential conductors are exchanged in the twisting section.

7. An electrical connection assembly as claimed in claim 6, wherein The relative physical positions between the first core and the second core of the second pair of differential conductors remain unchanged in the transmission path.

8. An electrical connection assembly as claimed in claim 6, wherein, The first connecting member is a circuit board, and the circuit board has two pairs of differential signal channels for connecting with the two pairs of differential conductors respectively, each pair of differential signal channels including a first channel and a second channel connected with the first core and the second core of a corresponding pair of differential conductors respectively; The first connecting member is a circuit board, and the circuit board has two pairs of differential signal channels for connecting with the two cable groups respectively, each pair of differential signal channels including a first channel and a second channel; The relative physical positions between the first channel and the second channel of one pair of differential signal channels are exchanged in the transmission path to switch the polar arrangement of the first channel and the second channel; the relative physical positions between the first channel and the second channel of another pair of differential signal channels remain unchanged in the transmission path. It includes: a first connecting member; a second connecting member; two pairs of adjacent differential conductors, including a first pair of differential conductors and a second pair of differential conductors, connected between the first connecting member and the second connecting member, each pair of differential conductors including adjacent first and second cores, the first core being used for transmitting signals of a first polarity, and the second core being used for transmitting signals of a second polarity, the first polarity and the second polarity being opposite; The polar arrangement of the first core and the second core of the first pair of differential conductors at the first end is opposite to that at the second end; and the polar arrangement of the first core and the second core of the second pair of differential conductors at the first end is the same as that at the second end; The first pair of differential conductors is provided with at least one holding section and at least one twisting section, the relative physical positions between the first core and the second core of the first pair of differential conductors remain unchanged in the holding section, and the relative physical positions between the first core and the second core of the first pair of differential conductors are exchanged in the twisting section. The relative physical positions between the first core and the second core of the second pair of differential conductors remain unchanged in the transmission path. The first connecting member is a circuit board, and the circuit board has two pairs of differential signal channels for connecting with the two pairs of differential conductors respectively, each pair of differential signal channels including a first channel and a second channel connected with the first core and the second core of a corresponding pair of differential conductors respectively; The relative physical positions between the first channel and the second channel of one pair of the differential signal channels are exchanged in the transmission path to switch the polar arrangement of the first channel and the second channel; the relative physical positions between the first channel and the second channel of another pair of the differential signal channels remain unchanged in the transmission path.

9. An electrical connection assembly as claimed in claim 6, wherein, The first pair of differential conductors is provided with a positioning portion located at a position adjacent to the first end of the first pair of differential conductors, so that when an operating body relatively fixes the second end, the positioning portion only twists the first pair of differential conductors once, so that the polar arrangement of the first core and the second core of the first pair of differential conductors at the first end is opposite to the polar arrangement at the second end, and the first core and the second core of the first pair of differential conductors as a whole extend in a straight line.

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