Electric connector

Abstract

An electric connector comprises a plurality of signal terminals which are arranged in multiple rows in the vertical direction, every two adjacent signal terminals in the left-right direction form a differential signal pair, and each signal terminal is provided with a signal fixing part and a signal contact part formed by extending from the signal fixing part; the extension direction of the shielding sheets is approximately parallel to the extension direction of the signal fixing part, an upper shielding sheet and a lower shielding sheet are arranged between two vertically adjacent differential signal pairs, and a plurality of upper reflection arms are bent and extended on one surface, facing the adjacent signal fixing part, of the upper shielding sheet; one surface, facing the adjacent signal fixing part, of the lower shielding sheet is bent and extends to form a plurality of lower reflection arms, the plurality of upper reflection arms and the plurality of lower reflection arms are arranged along the extension direction of the upper shielding sheet and the lower shielding sheet and are not in contact with the differential signal pair, and the electromagnetic wave is reflected for multiple times through the upper reflection arms and the lower reflection arms so as to increase the transmission path length of the electromagnetic wave; attenuation of electromagnetic waves in a transmission process is increased.

Description

[Technical field]

[0001] The invention relates to an electric connector, in particular to an electric connector capable of attenuating electromagnetic wave energy. [Background technology]

[0002] There is a connector, which includes a terminal module, including two signal sheets, two grounding sheets, and at least one metal shielding sheet. The two signal sheets are located between the two grounding sheets, the signal sheet is provided with multiple signal terminals, and the grounding sheet is provided with a grounding terminal; the metal shielding sheet is provided between two adjacent signal terminals of the same signal sheet and is separated from the signal terminals, and the metal shielding sheet is in contact with the grounding terminal.

[0003] However, simply setting a metal shielding plate between two adjacent signal terminals of the same signal plate body only shields the interference between adjacent differential signal pairs. The differential signal pair itself will radiate a large amount of electromagnetic waves in all directions when transmitting signals. Since the metal shielding plate is flat, the electromagnetic waves will be reflected by the metal shielding plate, causing the reflected electromagnetic waves to affect the differential signal pair itself, increase crosstalk, and reduce the transmission quality of the electrical connector.

[0004] Therefore, it is necessary to design a new electrical connector to overcome the above defects. [Summary of the invention]

[0005] The purpose of the invention is to provide an electrical connector that attenuates electromagnetic waves by arranging an upper shielding sheet and a lower shielding sheet between two adjacent differential signal pairs, wherein the extension direction of the shielding sheet is roughly parallel to the extension direction of the signal fixing portion, and the upper shielding sheet and the lower shielding sheet are correspondingly provided with a plurality of upper reflection arms and a plurality of lower reflection arms along the extension direction of the upper shielding sheet and the lower shielding sheet and not in contact with the differential signal pairs.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An electrical connector for docking with a docking element, comprising: a plurality of signal terminals, arranged in multiple rows along the up-down direction, and alternately arranged with a plurality of grounding terminals in the left-right direction, two adjacent signal terminals in the left-right direction forming a differential signal pair, and located between two adjacent grounding terminals, each signal terminal having a signal fixing portion, a signal contact portion extending from the signal fixing portion, and the signal contact portion being electrically connected to the docking element; a plurality of shielding sheets, the extension direction of the shielding sheets being substantially parallel to the extension direction of the signal fixing portion, the plurality of shielding sheets comprising a plurality of upper shielding sheets and a plurality of lower shielding sheets, an upper shielding sheet and a lower shielding sheet being provided between two adjacent differential signal pairs, a plurality of upper reflective arms being bent and extended from a side of the upper shielding sheet facing the adjacent signal fixing portion, a plurality of lower reflective arms being bent and extended from a side of the lower shielding sheet facing the adjacent signal fixing portion, and upper and lower adjacent upper reflective arms and lower reflective arms being staggered with each other along the extension direction of the upper shielding sheet and the lower shielding sheet, wherein the plurality of upper reflective arms and the plurality of lower reflective arms are arranged along the extension direction of the upper shielding sheet and the lower shielding sheet and do not contact the differential signal pairs.

[0008] Furthermore, the surface of each of the multiple upper reflection arms facing the adjacent signal fixing part forms an upper angle with the surface of the upper shielding plate, and the surface of each of the multiple lower reflection arms facing the adjacent signal fixing part forms a lower angle with the surface of the lower shielding plate. The multiple upper angles are arranged along the extension direction of the upper shielding plate, and the multiple lower angles are arranged along the extension direction of the lower shielding plate, and the electromagnetic waves are reflected multiple times within the angles.

[0009] Furthermore, each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end, wherein the lowest point of the upper free end extends upward beyond the surface of the upper shielding plate facing the adjacent signal fixing part, and the highest point of the lower free end extends downward beyond the surface of the lower shielding plate facing the adjacent signal fixing part.

[0010] Furthermore, each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end, and the distance from the highest point of the upper free end to the adjacent signal fixing part is set to be smaller than the distance from the highest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part, and the distance from the lowest point of the lower free end to the adjacent signal fixing part is smaller than the distance from the lowest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

[0011] Furthermore, the distance from the highest point of the upper free end to the adjacent signal fixing part is equal to the distance from the lowest point of the lower free end to the adjacent signal fixing part, and the distance from the highest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part is equal to the distance from the lowest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

[0012] Furthermore, each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end, and the distance from the highest point of the upper free end to the adjacent signal fixing part is set to be greater than the distance from the lowest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part, and the distance from the lowest point of the lower free end to the adjacent signal fixing part is greater than the distance from the highest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

[0013] Furthermore, each signal fixing portion includes a first section, one end of the first section is connected to the signal contact portion, the other end is connected to a bending section, the bending section is connected to a second section, wherein each upper reflection arm and each lower reflection arm are arranged corresponding to the second section.

[0014] Furthermore, the second section is perpendicular to the first section, and in the left-right direction, the second section does not exceed the upper reflective arm and the lower reflective arm.

[0015] Furthermore, each signal fixing portion includes a first section, one end of the first section is connected to the signal contact portion, and the other end is connected to a second section, the second section also includes a first extension section extending in the front-to-back direction, the first extension section is bent downward and extended to form a second extension section, and the second extension section is extended downward to form a third extension section, wherein the connection between the first extension section and the second extension section is a first connection, and the connection between the second extension section and the third extension section is a second connection, at least one upper reflection arm or at least one lower reflection arm is arranged near the first connection, and at least one upper reflection arm or at least one lower reflection arm is arranged near the second connection.

[0016] Furthermore, the upper shielding plate is provided with a plurality of upper openings, and the upper reflection arm is formed by extending from one edge of the upper opening; the lower shielding plate is provided with a plurality of lower openings, and the lower reflection arm is formed by extending from one edge of the lower opening, wherein the upper openings and the lower openings are at least partially staggered along the extension direction of the upper shielding plate and the lower shielding plate.

[0017] Furthermore, the upper shielding sheet and the lower shielding sheet are arranged at intervals, and a conductive plastic is arranged between the upper opening and the lower opening.

[0018] Furthermore, there is an upper gap between the upper reflective arm and the edge of the upper opening, there is a lower gap between the lower reflective arm and the edge of the lower opening, a conductive plastic is provided between the differential signal pair and the ground terminal, the conductive plastic is located between the upper shielding sheet and the lower shielding sheet, wherein the conductive plastic includes a base, a plurality of upper matching blocks and a plurality of lower matching blocks are respectively provided on the left and right sides of the base, the plurality of upper matching blocks and the plurality of lower matching blocks are staggered along the extension direction of the conductive plastic, the upper matching block is located between the signal fixing portion and the lower gap, and the upper gap is located between the signal fixing portion and the lower matching block.

[0019] Furthermore, the upper shielding plate is formed with a plurality of upper mating recesses, the lower shielding plate is formed with a plurality of lower mating recesses, a conductive plastic includes a base, and a plurality of upper mating blocks and a plurality of lower mating blocks are respectively provided on the left and right sides of the base, wherein each upper mating block is mated with each upper mating recess, and each lower mating block is mated with each lower mating recess.

[0020] Furthermore, the upper shielding sheet also includes multiple upper plate portions and multiple upper convex portions, the multiple upper plate portions and the multiple upper convex portions are alternately arranged along the extension direction of the upper shielding sheet, the upper matching recess is arranged on the left and right sides of the upper plate portion, and the upper reflection arm is extended from the surface of the upper convex portion facing the signal fixing portion. The lower shielding sheet also includes multiple lower plate portions and multiple lower convex portions, the multiple lower plate portions and the multiple lower convex portions are alternately arranged along the extension direction of the lower shielding sheet, the lower matching recess is arranged on the left and right sides of the lower plate portion, and the lower reflection arm is extended from the surface of the lower convex portion facing the signal fixing portion, wherein the upper plate portion corresponds to the lower convex portion, and the lower plate portion corresponds to the upper convex portion, and in the left and right directions, the size of the upper reflection arm is larger than the size of the lower plate portion, and the size of the lower reflection arm is larger than the size of the upper plate portion.

[0021] Further, the lower matching block supports the upper protrusion upwards, and the lower protrusion supports the upper matching block upwards.

[0022] Furthermore, the base of the conductive plastic also includes multiple upper receiving parts and multiple lower receiving parts, the upper receiving parts and the upper matching blocks are alternately arranged along the extension direction of the conductive plastic, and the lower receiving parts and the lower matching blocks are alternately arranged along the extension direction of the conductive plastic, wherein the upper receiving parts limit the upper protrusions, and the lower receiving parts limit the lower protrusions.

[0023] Furthermore, a conductive plastic is disposed between the upper shielding sheet and the lower shielding sheet, and the maximum thickness of the conductive plastic does not exceed the surface of the upper shielding sheet facing the adjacent signal fixing portion, nor does it exceed the surface of the lower shielding sheet facing the adjacent signal fixing portion.

[0024] Furthermore, one side of a conductive plastic connects the upper shielding sheet to the lower shielding sheet, and the other side of the conductive plastic is connected to the ground terminal, and the signal fixing portion of at least one differential signal pair is located in a shielding space enclosed by an upper shielding sheet and a lower shielding sheet adjacent to it, and the conductive plastics adjacent to it on the left and right, and the ground terminal.

[0025] Furthermore, each signal fixing portion and each upper shielding plate, each lower shielding plate is fixed to a signal retaining frame, each signal retaining frame is provided with a plurality of upper limit slots and lower limit slots, each upper reflection arm is limited to at least one upper limit slot, and each lower reflection arm is limited to at least one lower limit slot.

[0026] Furthermore, each signal fixing portion is fixed to a signal holding frame, each upper shielding sheet and each lower shielding sheet are fixed to two adjacent signal holding frames, and each signal holding frame is provided with a supporting portion, which is located between the upper shielding sheet and the lower shielding sheet.

[0027] Compared with the prior art, the electrical connector of the present invention has the following beneficial effects: an upper shielding sheet and a lower shielding sheet are arranged between two adjacent differential signal pairs, the extension direction of the shielding sheet is substantially parallel to the extension direction of the signal fixing portion, and the upper shielding sheet and the lower shielding sheet are correspondingly provided with a plurality of upper reflection arms and a plurality of lower reflection arms arranged along the extension direction of the upper shielding sheet and the lower shielding sheet and not in contact with the differential signal pair. In this way, when the electromagnetic field around one of the differential signal pairs diverges to the other differential signal pair in the form of electromagnetic waves, the transmission path length of the electromagnetic wave is increased through multiple reflections of the upper reflection arm and the lower reflection arm, so as to increase the attenuation of the electromagnetic wave during the transmission process. In this way, the influence of the attenuated electromagnetic wave on the other differential signal pair is weakened, thereby optimizing the SI performance of the electrical connector.

Brief Description of the Drawings

[0028] Figure 1 is a front view of the electrical connector of the present invention;

[0029] Figure 2 for Figure 1 3D exploded view of the CEC connector before assembly;

[0030] Figure 3 for Figure 2 An exploded view of the middle signal sheet, the ground sheet, the first shielding plate, and the second shielding plate;

[0031] Figure 4 for Figure 3 A three-dimensional diagram of a terminal module consisting of two grounding sheets, two signal sheets, a conductive plastic disposed on the grounding sheets, and a metal shielding sheet disposed on the signal sheets;

[0032] Figure 5 for Figure 4 3D exploded view of the middle terminal module;

[0033] Figure 6 for Figure 1 A side view of the CEC connector mounted on a circuit board and concealing an insulating housing and a signal holder;

[0034] Figure 7 for Figure 1 Section view along AA direction;

[0035] Figure 8 for Figure 1 Sectional view along direction BB;

[0036] Fig. 9 for Figure 4 In the three-dimensional diagram, only the shielding sheet and the conductive plastic are shown;

[0037] Fig.10 for Fig. 9 A top view of the assembly of the upper shielding sheet, the lower shielding sheet and the conductive plastic part;

[0038] Fig.11 for Figure 4 Front view of the two hidden ground cages.

[0039] Description of the accompanying drawings for the specific implementation:

[0040]

[0041] [Specific implementation method]

[0042] In order to facilitate a better understanding of the purpose, structure, characteristics and effects of the present invention, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods.

[0043] For ease of understanding, the Z-axis extension direction is defined as the up-down direction (where the positive direction of the Z-axis is the upward direction), the Y-axis extension direction is defined as the left-right direction (where the positive direction of the Y-axis is the right direction), and the X-axis extension direction is defined as the front-back direction (where the positive direction of the X-axis is the forward direction).

[0044] like Figure 1 , Figure 2 , Figure 5 As shown, an electrical connector 100 of the present invention is installed on a circuit board 200 for plugging with a docking element (not shown). The electrical connector 100 includes an insulating shell 1 and a plurality of signal terminals 21, a plurality of grounding terminals 31, a plurality of conductive plastics 4, a plurality of shielding sheets 5, a first shielding plate 6 and a second shielding plate 7 arranged in the insulating shell 1. The plurality of signal terminals 21 arranged in multiple rows along the up and down directions are alternately arranged with the plurality of grounding terminals 31 in the left and right directions. The plurality of shielding sheets 5 are arranged between two adjacent signal terminals 21 in the up and down directions. The plurality of conductive plastics 4 are arranged on the plurality of grounding terminals 31. The conductive plastics 4 are connected to the corresponding shielding sheets 5 to form a grounding loop. The first shielding plate 6 and the second shielding plate 7 are arranged on the top surfaces of the grounding terminals 31 and the signal terminals 21 and are in contact with the plurality of grounding terminals 31.

[0045] like Figure 1 and Figure 2As shown, the insulating housing 1 has at least one slot 11. Specifically, the slot 11 is formed by being recessed from the front end surface of the insulating housing 1 to the rear, and two slots 11 are provided. The two slots 11 are arranged side by side and spaced apart in the up-down direction, and the slots 11 are used for inserting the docking element. In other embodiments, according to the type requirements of the electrical connector 100, the slot 11 can be recessed downward from the upper surface of the insulating housing 1, and only one slot 11 can be provided, or other numbers of slots 11 can be provided.

[0046] like Figure 4 and Figure 5 As shown, in this embodiment, two adjacent signal terminals 21 in the left-right direction form a differential signal pair S, and a plurality of differential signal pairs S are arranged in the up-down direction and located between two adjacent ground terminals 31. In other embodiments, only one signal terminal 21 may be provided between two ground terminals 31.

[0047] like Figure 4 , Figure 5 and Figure 6 As shown, a plurality of signal terminals 21 arranged in the vertical direction are fixed to a signal holder 22 to form a signal sheet body 2. The signal holder 22 is made of an insulating material and is molded over the plurality of signal terminals 21. Each signal terminal 21 includes a signal fixing portion 212, a signal contact portion 211 connected to the signal fixing portion 212, and a signal pin 213. The signal fixing portion 212 is fixed in the signal holder 22. The signal contact portion 211 and the signal pin 213 are exposed from the signal holder 22. The signal pin 213 is used for welding with the circuit board 200. Each signal retaining frame 22 is provided with a plurality of upper limit slots 221 and a plurality of lower limit slots 222 and a supporting portion 223 located between the upper limit slots 221 and the lower limit slots 222. The signal fixing portion 212 is located between the upper limit slots 221 and the lower limit slots 222, and the plurality of upper limit slots 221 and the plurality of lower limit slots 222 are alternately arranged up and down along the extension direction of the signal fixing portion 212.

[0048] like Figure 5 , Figure 6 As shown, specifically, the signal fixing portion 212 includes a first section 2121, a bending section 2122, and a second section 2123, wherein one end of the first section 2121 is connected to the signal contact portion 211, and the other end is connected to the bending section 2122, the bending section 2122 is connected to the second section 2123, and the second section 2123 is connected to the signal pin 213. Specifically, the width of the first section 2121 in the left-right direction is greater than the width of the second section 2123 in the left-right direction, and the plate where the second section 2123 is located is perpendicular to the plate where the first section 2121 is located.

[0049] like Figure 5 and 7As shown, further, the second section 2123 can be divided into a first extension section 2123A, a second extension section 2123B and a third extension section 2123C, wherein the first extension section 2123A is bent downward and extended to form the second extension section 2123B, the second extension section 2123B is extended downward to form the third extension section 2123C, the third extension section 2123C is connected to the signal pin 213, the first extension section 2123A is connected to the second extension section 2123B through a bent first connection point P1, and the second extension section 2123B is connected to the third extension section 2123C through a bent second connection point P2.

[0050] like Figure 5 and Figure 8 As shown, each grounding terminal 31 is fixed to a grounding holder 32 to form a grounding sheet 3. The grounding holder 32 is made of an insulating material and is molded around the outside of the plurality of grounding terminals 31. Specifically, in this embodiment, there is one grounding terminal 31 that is alternately arranged with the plurality of signal terminals 21 in the left-right direction, and is in a sheet shape. The grounding terminal 31 includes a plurality of grounding contact portions 311, a grounding fixing portion 312, and a plurality of grounding pins 313. The plurality of grounding contact portions 311 extend toward the slot 11 through the grounding fixing portion 312 to form a contact with the docking element, and the plurality of grounding contact portions 311 are arranged at intervals in the up-down direction. The grounding fixing portion 312 is held in the grounding holder 32. The grounding fixing portion 312 is provided with a plurality of clamping holes 3121. The plurality of clamping holes 3121 are arranged at intervals in the extending direction of the signal fixing portion 212. The plurality of protrusions 3122 are extended from the upper surface of the grounding fixing portion 312 and are arranged in the front-back direction. A plurality of grounding pins 313 are formed extending from the bottom of the grounding fixing portion 312, and the plurality of grounding pins 313 are used for welding with the circuit board 200, and the plurality of grounding pins 313 and the plurality of protruding portions 3122 are exposed from the grounding holding frame 32. Of course, in other embodiments, a plurality of grounding terminals 31 arranged in the vertical direction and a plurality of signal terminals 21 can also be arranged alternately left and right, wherein each grounding terminal 31 includes a grounding contact portion 311, a grounding pin 313, and a grounding fixing portion 312 connecting the grounding contact portion 311 and the grounding pin 313.

[0051] like Figure 3 and Figure 4As shown, in the present embodiment, two adjacent grounding sheets 3 and two signal sheets 2 located between the two adjacent grounding sheets 3 are defined as a terminal module R, wherein in one terminal module R, a plurality of grounding contact portions 311 and a plurality of signal contact portions 211 are arranged in at least two rows along the up and down directions, and each row includes a plurality of grounding contact portions 311 and a plurality of signal contact portions 211, and the grounding contact portions 311 and the signal contact portions 211 both extend into the slot 11 for electrical contact with a docking element (not shown) inserted into the slot 11. Specifically, in the present embodiment, each signal sheet 2 is provided with four signal terminals 21, and the signal contact portions 211 of the four signal terminals 21 are arranged in the up-down direction, and the four signal pins 213 of the four signal terminals 21 are arranged at intervals in the front-to-back direction. Each grounding sheet 3 is provided with four grounding contact portions 311 arranged in the up-down direction and four grounding pins 313 arranged at intervals in the front-to-back direction. The four grounding contact portions 311 and the four signal contact portions 211 are arranged correspondingly in the left-right direction. The multiple signal contact portions 211 and the multiple grounding contact portions 311 of the multiple signal sheets 2 and the multiple grounding sheets 3 are arranged in four rows, so that each row includes multiple grounding contact portions 311 and multiple signal contact portions 211. A socket (not shown) is formed between the two upper rows of signal contact portions 211 and the grounding contact portions 311, and is arranged correspondingly on the upper and lower sides of the upper slot 11. Another socket (not shown) is formed between the two lower rows of signal contact portions 211 and the grounding contact portions 311, and is arranged correspondingly on the upper and lower sides of the lower slot 11. In other embodiments, according to requirements, each signal sheet 2 may be provided with two or other numbers of signal terminals 21, and each grounding sheet 3 may be provided with grounding contact portions 311 corresponding to the number of signal contact portions 211 of the signal terminals 21. In still other embodiments, the grounding sheet 3 may include a plurality of independently provided grounding terminals 31, and the plurality of grounding terminals 31 may be held together by a grounding holder 32.

[0052] like Figure 5 and Fig. 9 As shown, each terminal module R includes multiple conductive plastics 4. Specifically, the multiple conductive plastics 4 are injection molded with the corresponding grounding sheet body 3. The conductive plastic 4 is made of lossy material. The conductive plastic 4 includes a base 41 and multiple upper matching blocks 411A and multiple lower matching blocks 412A located on the left and right sides of the base 41. The multiple upper matching blocks 411A and the multiple lower matching blocks 412A are alternately arranged left and right along the extension direction of the conductive plastic 4. In the left and right direction, an upper receiving portion 411B is provided between every two adjacent upper matching blocks 411A, and a lower receiving portion 412B is provided between every two adjacent lower matching blocks 412A. The upper receiving portion 411B is arranged to correspond to the lower matching block 412A, and the lower receiving portion 412B corresponds to the upper matching block 411A.

[0053] like Figure 5 , Fig. 9 and Fig.10 As shown, the plurality of shielding sheets 5 include a plurality of upper shielding sheets 51 and a plurality of lower shielding sheets 52, and the plurality of upper shielding sheets 51 and the plurality of lower shielding sheets 52 are arranged in each terminal module R, and the plurality of upper shielding sheets 51 and the plurality of lower shielding sheets 52 are installed in two adjacent signal sheet bodies 2 on the left and right. Specifically, each upper shielding sheet 51 and each lower shielding sheet 52 are arranged between two adjacent differential signal pairs S on the upper and lower sides, and the upper shielding sheet 51 and the lower shielding sheet 52 are supported by two adjacent supporting portions 223, and the extension direction of the upper shielding sheet 51 and the lower shielding sheet 52 is parallel to the extension direction of the signal fixing portion 212. The upper shielding sheet 51 includes a plurality of upper plate portions 512 and a plurality of upper protrusions 513, which are alternately arranged along the extension direction of the upper shielding sheet 51, and the upper plate portion 512 is provided with an upper matching recess 511 on both sides of the left and right sides, respectively. The lower shielding sheet 52 includes a plurality of lower plate portions 522 and a plurality of lower protrusions 523, which are alternately arranged along the extension direction of the lower shielding sheet 52, and the lower plate portion 522 is provided with a lower matching recess 521 on both sides of the left and right sides, wherein the upper plate portion 512 corresponds to the lower protrusion 523, and the lower plate portion 522 corresponds to the upper protrusion 513, and in the left and right directions, the size of the upper reflection arm 5141 is larger than the size of the lower plate portion 522, and the size of the lower reflection arm 5241 is larger than the size of the upper plate portion 512.

[0054] like Fig. 9 and Fig.10As shown, a plurality of upper openings 514 penetrate the upper shielding sheet 51, and a plurality of lower openings 524 penetrate the lower shielding sheet 52. Specifically, the upper openings 514 penetrate the upper convex portion 513, and the lower openings 524 penetrate the lower convex portion 523. In the up-down direction, the upper openings 514 and the lower openings 524 are partially staggered along the extending direction of the upper shielding sheet 51 and the lower shielding sheet 52. A plurality of upper reflection arms 5141 are bent and extended from one side of the upper shielding sheet 51 facing the adjacent signal fixing portion 212, and a plurality of lower reflection arms 5241 are bent and extended from one side of the lower shielding sheet 52 facing the adjacent signal fixing portion 212. More specifically, the plurality of upper reflection arms 5141 are formed by each upper shielding sheet 51 bending and extending upward from one edge of the upper opening 514 to the adjacent second section 2123, and the plurality of lower reflection arms 5241 are formed by each lower shielding sheet 52 bending and extending downward from one edge of the lower opening 524 to the adjacent second section 2123. The upper reflective arms 5141 and the lower reflective arms 5241 adjacent to each other are staggered along the extension direction of the upper shielding sheet 51 and the lower shielding sheet 52, and each upper reflective arm 5141 is limited to two adjacent upper limit slots 221, and each lower reflective arm 5241 is limited to two adjacent lower limit slots 222. Each upper reflective arm 5141 includes an upper free end W1, and each lower reflective arm 5241 includes a lower free end W2, wherein the lowest point of the upper free end W1 exceeds the surface of the upper shielding sheet 51 facing the adjacent signal fixing portion 212 upward, and the highest point of the lower free end W2 exceeds the surface of the lower shielding sheet 52 facing the adjacent signal fixing portion 212 downward.

[0055] like Fig. 9 As shown, in this embodiment, there is an upper gap 515 between the upper reflection arm 5141 and the other edges of the upper opening 514, and there is a lower gap 525 between the lower reflection arm 5241 and the other edges of the lower opening 524, wherein the upper matching recess 511 and the upper plate portion 512 of the upper shielding sheet 51 are arranged corresponding to the partial lower gap 525 of the lower shielding sheet 52, and the lower matching recess 521 and the lower plate portion 522 of the lower shielding sheet 52 are arranged to match the partial upper gap 515 of the upper shielding sheet 51.

[0056] like Figure 6 and Figure 7As shown, when the electrical signal is transmitted along the signal transmission path, the electromagnetic field around one of the two differential signal pairs S adjacent to each other will radiate to the other differential signal pair S in the form of electromagnetic waves, causing crosstalk, thereby affecting the SI performance of the electrical connector 100. By providing an upper shielding sheet 51 and a lower shielding sheet 52 between the two adjacent differential signal pairs S, the extension directions of the upper shielding sheet 51 and the lower shielding sheet 52 are parallel to the extension direction of the signal fixing portion 212, and the upper shielding sheet 51 and the lower shielding sheet 52 are provided on the upper shielding sheet 51 and the lower shielding sheet 52. , and multiple upper reflection arms 5141 and multiple lower reflection arms 5241 are provided in the extending direction of the lower shielding sheet 52. Thus, when the electromagnetic field around one of the differential signal pairs S diverges to the other differential signal pair S in the form of electromagnetic waves, the electromagnetic waves are reflected multiple times by the upper reflection arms 5141 and the lower reflection arms 5241 to increase the transmission path length of the electromagnetic waves, so as to increase the attenuation of the electromagnetic waves during the transmission process. In this way, the influence of the attenuated electromagnetic waves on the other differential signal pair S (i.e., crosstalk) is weakened, thereby optimizing the SI performance of the electrical connector 100.

[0057] Furthermore, if Figure 6 and Figure 7As shown, the upper reflection arm 5141 and the lower reflection arm 5241 are not in contact with the differential signal pair S. More specifically, if the upper reflection arm 5141 and the lower reflection arm 5241 are far away from the signal fixing portion 212, the reflection effect of the upper reflection arm 5141 and the lower reflection arm 5241 on electromagnetic waves will be affected, and more electromagnetic waves cannot be effectively attenuated. Therefore, the distance from the highest point of the upper free end W1 to the adjacent signal fixing part 212 is defined as the first distance H1, the distance from the highest point of the upper free end W1 to the surface of the upper shielding plate 51 facing the adjacent signal fixing part 212 is defined as the second distance H2, the distance from the lowest point of the lower free end W2 to the adjacent signal fixing part 212 is defined as the third distance H3, and the distance from the lowest point of the lower free end W2 to the surface of the lower shielding plate 52 facing the adjacent signal fixing part 212 is defined as the fourth distance H4. The first distance H1 is set to be smaller than the second distance H2, and the third distance H3 is set to be smaller than the fourth distance H4, so as to achieve more effective attenuation of more electromagnetic waves and reduce interference. The first distance H1 can be equal to the third distance H3, and the second distance H2 can be equal to the fourth distance H4, which facilitates the assembly of the upper shielding plate 51 and the lower shielding plate 52 and ensures that the electromagnetic waves of the signal fixing part 212 can be reflected. Furthermore, the distance from the lowest point of the upper free end W1 to the surface of the upper shielding plate 51 facing the adjacent signal fixing part 212 is the fifth distance H5, and the distance from the highest point of the lower free end W2 to the surface of the lower shielding plate 52 facing the adjacent signal fixing part 212 is the sixth distance H6, wherein the first distance H1 is greater than the fifth distance H5, and the third distance H3 is greater than the sixth distance H6. Such a setting can prevent the upper reflection arm 5141 and the lower reflection arm 5241 from being too close to the adjacent signal fixing part 212, thereby affecting the impedance matching of the signal fixing part 212, and can also prevent the signal terminal 21 from being short-circuited with the upper shielding plate 51 or the lower shielding plate 52 through the upper reflection arm 5141 or the lower reflection arm 5241.

[0058] like Fig.10As shown, if the second section 2123 exceeds the upper reflection arm 5141 and the lower reflection arm 5241 in the left-right direction, fewer electromagnetic waves are reflected by the upper reflection arm 5141 and the lower reflection arm 5241, so that more electromagnetic waves will pass through the upper gap 515 and the lower gap 525 to affect other differential signal pairs S. In order to prevent the above situation from occurring, the upper reflection arm 5141 and the lower reflection arm 5241 need to be made wider, but this will also weaken the structural strength of the upper shielding plate 51 and the lower shielding plate 52. By making the second section 2123 perpendicular to the first section 2121 and not exceeding the upper reflection arm 5141 and the lower reflection arm 5241 in the left-right direction, a larger shielding area can be provided, ensuring that most of the electromagnetic waves along the signal transmission path can be reflected and will not pass through and affect other signal terminals 21, and ensuring that the size of the upper reflection arm 5141 and the lower reflection arm 5241 will not affect the structural stability of the upper shielding plate 51 and the lower shielding plate 52.

[0059] like Figure 7 As shown, since the electromagnetic waves of noise will be superimposed on the signal transmission path as the signal is transmitted, the crosstalk between the signal terminals 21 is increased, so the surface of each upper reflection arm 5141 of the plurality of upper reflection arms 5141 facing the adjacent signal fixing portion 212 forms an upper angle Q1 with the surface of the upper shielding sheet 51, and the surface of each lower reflection arm 5241 of the plurality of lower reflection arms 5241 facing the adjacent signal fixing portion 212 forms a lower angle Q2 with the surface of the lower shielding sheet 52, and the plurality of upper angles Q1 are arranged along the extension direction of the upper shielding sheet 51, and the plurality of lower angles Q2 are arranged along the extension direction of the lower shielding sheet 52. The electromagnetic waves are arranged such that they are reflected multiple times within the upper angle Q1 and the lower angle Q2, thereby suppressing the noise intensity after the noise electromagnetic waves are superimposed along the signal transmission direction. In other words, before the noise electromagnetic waves are superimposed, at least a portion of each upper angle Q1 and at least a portion of each lower angle Q2 are located between two upper and lower adjacent signal fixing portions 212, and at least a portion of the multiple electromagnetic wave components superimposed together have been attenuated within the upper angle Q1 and the lower angle Q2. Therefore, the intensity of these electromagnetic wave components is also weakened after being superimposed, thereby achieving the effect of optimizing the crosstalk between the signal terminals 21.

[0060] like Figure 6 and Figure 7As shown, since the first connection P1 and the second connection P2 are both bent connections, impedance mismatch problems are likely to occur. The impedance mismatch aggravates the reflection of electromagnetic waves, causing the intensity and density of the electromagnetic waves radiated outward by the signal fixing portion 212 to increase, and the crosstalk to other signal terminals 21 will also be enhanced. By setting at least one upper reflection arm 5141 or at least one lower reflection arm 5241 close to the first connection P1, and at least one upper reflection arm 5141 or at least one lower reflection arm 5241 close to the second connection P2, the electromagnetic waves generated by the first connection P1 and the second connection P2 are reflected and attenuated, thereby reducing the crosstalk to other signal terminals 21.

[0061] like Figure 8 , Figure 6 and Fig.10 As shown, each base 41 of the plurality of conductive plastics 4 is fixed to the corresponding clamping hole 3121 of the ground terminal 31, and is disposed between the upper shielding sheet 51 and the lower shielding sheet 52. The maximum thickness of the conductive plastic 4 is set not to exceed the surface of the upper shielding sheet 51 facing the signal fixing portion 212, nor to exceed the surface of the lower shielding sheet 52 facing the signal fixing portion 212, so as to ensure the precise splicing of the conductive plastic 4 with the lower shielding sheet 52 and the upper shielding sheet 51. Further, each upper matching block 411A is matched with each upper matching recess 511, and each lower matching block 412A is matched with each lower matching recess 521. In a specific embodiment, the gap between the conductive plastic 4 and the upper shielding sheet 51 and the lower shielding sheet 52 is conductive, and there is a gap between the conductive plastic 4 and the upper shielding sheet 51 and the lower shielding sheet 52. It can be imagined that the gap is small enough to generate electrical coupling between the conductive plastic 4 and the upper shielding sheet 51 and the lower shielding sheet 52 without affecting the quality of signal transmission. Here, the meaning of electrical connection or electrical coupling is, for example but not limited to: regardless of whether the two elements are in actual contact with each other, when the two elements are electrically connected, the two elements will produce corresponding electrical or electromagnetic changes or influences.

[0062] like Fig. 9 , Fig.10 and Fig.11As shown, each upper protrusion 513 is correspondingly limited to each upper receiving portion 411B, and each lower protrusion 523 is correspondingly limited to each lower receiving portion 412B. More specifically, at this time, in the up-down direction, the upper matching block 411A is located between the signal fixing portion 212 and the lower gap 525, and the upper gap 515 is located between the signal fixing portion 212 and the lower matching block 412A, so that the electromagnetic waves leaked from the upper gap 515 and the lower gap 525 can be absorbed by the upper matching block 411A and the lower matching block 412A, so that the crosstalk can be effectively absorbed and suppressed to improve the high-frequency signal In addition, the upper shielding sheet 51 and the lower shielding sheet 52 are electrically connected to the ground terminal 31 through the conductive plastic 4, and the series connection between the ground terminals 31 in the same row is realized. At this time, the signal fixing portion 212 of at least one differential signal pair S is located in the shielding space enclosed by an upper shielding sheet 51 and a lower shielding sheet 52 adjacent to it, and the conductive plastic 4 and the ground terminal 31 adjacent to it on the left and right. The signal fixing portion 212 is located in the shielding space to achieve full shielding of the differential signal pair S to avoid interference with other differential signal pairs S.

[0063] like Figure 2 and Figure 3 As shown, the first shielding plate 6 and the second shielding plate 7 are both covered on the outside of the signal sheet body 2 and the grounding sheet body 3 and connected to a plurality of grounding terminals 31. Specifically, the tops of the signal retaining frame 22 and the grounding retaining frame 32 include a first table surface M and a second table surface N. The first table surface M is higher than the second table surface N in the up-down direction. The second table surface N is arranged close to the signal contact portion 211 and the grounding contact portion 311 in the front-to-back direction relative to the first table surface M. The top of the grounding fixing portion 312 close to the grounding contact portion 311 protrudes from the second table surface N. The protruding portion 3122 is protruding from the top of the grounding fixing portion 312 and exposed on the first table surface M. The first shielding plate 6 is covered on the first table surface M and in contact with the protruding portion 3122. The second shielding plate 7 is covered on the second table surface N and in contact with the grounding fixing portion 312. Specifically, the protruding portion 3122 passes upward through the bottom surface of the first shielding plate 6, and a part of the grounding fixing portion 312 passes upward through the bottom surface of the second shielding plate 7.

[0064] In summary, the electrical connector of the present invention has the following beneficial effects:

[0065] (1) Compared with the prior art, the present invention is provided with an upper shielding sheet 51 and a lower shielding sheet 52 between two adjacent differential signal pairs S, the extension direction of the upper shielding sheet 51 and the lower shielding sheet 52 is parallel to the extension direction of the signal fixing portion 212, and the upper shielding sheet 51 and the lower shielding sheet 52 are provided with a plurality of upper reflection arms 5141 and a plurality of lower reflection arms 5241 arranged along the extension direction of the upper shielding sheet 51 and the lower shielding sheet 52 and not in contact with the differential signal pairs S. In this way, when the electromagnetic field around one of the differential signal pairs S diverges toward the other differential signal pair S in the form of electromagnetic waves, the electromagnetic waves are reflected multiple times by the upper reflection arms 5141 and the lower reflection arms 5241 to increase the transmission path length of the electromagnetic waves, so as to increase the attenuation of the electromagnetic waves during the transmission process. In this way, the influence of the attenuated electromagnetic waves on the other differential signal pair S (i.e., crosstalk) is weakened, thereby optimizing the SI performance of the electrical connector 100.

[0066] (2) A surface of each of the plurality of upper reflection arms 5141 facing the adjacent signal fixing portion 212 forms an upper angle Q1 with the surface of the upper shielding plate 51, and a surface of each of the plurality of lower reflection arms 5241 facing the adjacent signal fixing portion 212 forms a lower angle Q2 with the surface of the lower shielding plate 52, and the plurality of upper angles Q1 are arranged along the extension direction of the upper shielding plate 51, and the plurality of lower angles Q2 are arranged along the extension direction of the lower shielding plate 52. Electromagnetic waves are reflected multiple times within the upper angle Q1 and the lower angle Q2, so that the noise intensity after the electromagnetic waves of noise are superimposed along the signal transmission direction is suppressed. In other words, before the electromagnetic waves of noise are superimposed, at least part of the multiple electromagnetic wave components superimposed together have been attenuated within the upper angle Q1 and the lower angle Q2, so the intensity of these electromagnetic wave components is also weakened after being superimposed, thereby achieving the effect of optimizing the crosstalk between the signal terminals 21.

[0067] (3) Since the first connection point P1 and the second connection point P2 are both bent connections, an impedance mismatch problem is easily generated. The impedance mismatch aggravates the reflection of electromagnetic waves, resulting in an increase in the intensity and density of the electromagnetic waves radiated outward by the signal fixing portion 212, and the crosstalk to other signal terminals 21 is also enhanced. By arranging at least one upper reflection arm 5141 or at least one lower reflection arm 5241 close to the first connection point P1, and at least one upper reflection arm 5141 or at least one lower reflection arm 5241 close to the second connection point P2, the electromagnetic waves generated by the first connection point P1 and the second connection point P2 are reflected and attenuated, thereby reducing the crosstalk to other signal terminals 21.

[0068] (4) In the up and down directions, the upper mating block 411A is located between the signal fixing portion 212 and the lower gap 525, and the upper gap 515 is located between the signal fixing portion 212 and the lower mating block 412A, so that the electromagnetic waves leaked from the upper gap 515 and the lower gap 525 can be absorbed by the upper mating block 411A and the lower mating block 412A, so that the crosstalk can be effectively absorbed and suppressed to improve the quality of high-frequency signal transmission.

[0069] (5) A signal fixing portion 212 of at least one differential signal pair S is disposed in a shielding space enclosed by an upper shielding sheet 51 and a lower shielding sheet 52 adjacent thereto, and the conductive plastic 4 and the grounding terminal 31 adjacent thereto on the left and right. The signal fixing portion 212 is located in the shielding space to achieve full shielding of the differential signal pair S and avoid interference with other differential signal pairs S.

[0070] The above detailed description is only an explanation of the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and illustrations of this creation are included in the patent scope of this creation.

Claims

1. An electrical connector for docking with a docking element, characterized in that: include: A plurality of signal terminals are arranged in multiple rows along the vertical direction, and are alternately arranged with a plurality of ground terminals in the horizontal direction. Two adjacent signal terminals in the horizontal direction form a differential signal pair and are located between two adjacent ground terminals. Each signal terminal has a signal fixing portion, and a signal contact portion extending from the signal fixing portion is formed, and the signal contact portion is electrically connected to the docking element. A plurality of shielding sheets, wherein the extending direction of the shielding sheets is roughly parallel to the extending direction of the signal fixing part, the plurality of shielding sheets include a plurality of upper shielding sheets and a plurality of lower shielding sheets, an upper shielding sheet and a lower shielding sheet are provided between two upper and lower adjacent differential signal pairs, a plurality of upper reflection arms are bent and extended on one side of the upper shielding sheet facing the adjacent signal fixing part, a plurality of lower reflection arms are bent and extended on one side of the lower shielding sheet facing the adjacent signal fixing part, and the upper reflection arms and lower reflection arms adjacent to each other are staggered along the extending direction of the upper shielding sheet and the lower shielding sheet, wherein the plurality of upper reflection arms and the plurality of lower reflection arms are arranged along the extending direction of the upper shielding sheet and the lower shielding sheet and do not contact the differential signal pairs.

2. The electrical connector according to claim 1, wherein: The surface of each of the multiple upper reflection arms facing the adjacent signal fixing part forms an upper angle with the surface of the upper shielding plate, and the surface of each of the multiple lower reflection arms facing the adjacent signal fixing part forms a lower angle with the surface of the lower shielding plate. The multiple upper angles are arranged along the extension direction of the upper shielding plate, and the multiple lower angles are arranged along the extension direction of the lower shielding plate, and the electromagnetic waves are reflected multiple times within the angles.

3. The electrical connector according to claim 1, wherein: Each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end, wherein the lowest point of the upper free end extends upward beyond the surface of the upper shielding plate facing the adjacent signal fixing portion, and the highest point of the lower free end extends downward beyond the surface of the lower shielding plate facing the adjacent signal fixing portion.

4. The electrical connector according to claim 1, wherein: Each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end. The distance from the highest point of the upper free end to the adjacent signal fixing part is set to be smaller than the distance from the highest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part, and the distance from the lowest point of the lower free end to the adjacent signal fixing part is set to be smaller than the distance from the lowest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

5. The electrical connector according to claim 4, wherein: The distance from the highest point of the upper free end to the adjacent signal fixing part is equal to the distance from the lowest point of the lower free end to the adjacent signal fixing part, and the distance from the highest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part is equal to the distance from the lowest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

6. The electrical connector according to claim 1, wherein: Each upper reflective arm includes an upper free end, and each lower reflective arm includes a lower free end. The distance from the highest point of the upper free end to the adjacent signal fixing part is set to be greater than the distance from the lowest point of the upper free end to the surface of the upper shielding plate facing the adjacent signal fixing part, and the distance from the lowest point of the lower free end to the adjacent signal fixing part is greater than the distance from the highest point of the lower free end to the surface of the lower shielding plate facing the adjacent signal fixing part.

7. The electrical connector according to claim 1, wherein: Each signal fixing portion includes a first section, one end of the first section is connected to the signal contact portion, the other end is connected to a bending section, the bending section is connected to a second section, wherein each upper reflection arm and each lower reflection arm are arranged corresponding to the second section.

8. The electrical connector according to claim 7, wherein: The second section is perpendicular to the first section, and in the left-right direction, the second section does not exceed the upper reflective arm and the lower reflective arm.

9. The electrical connector according to claim 1, wherein: Each signal fixing portion includes a first section, one end of the first section is connected to the signal contact portion, and the other end is connected to a second section, the second section also includes a first extension section extending in the front-to-back direction, the first extension section continues to bend downward and extend to form a second extension section, the second extension section extends downward to form a third extension section, wherein the connection between the first extension section and the second extension section is the first connection, the connection between the second extension section and the third extension section is the second connection, at least one upper reflection arm or at least one lower reflection arm is arranged near the first connection, and at least one upper reflection arm or at least one lower reflection arm is arranged near the second connection.

10. The electrical connector according to claim 1, wherein: The upper shielding plate is provided with a plurality of upper openings, and the upper reflection arm is formed by extending from one edge of the upper opening; the lower shielding plate is provided with a plurality of lower openings, and the lower reflection arm is formed by extending from one edge of the lower opening, wherein the upper openings and the lower openings are at least partially staggered along the extension direction of the upper shielding plate and the lower shielding plate.

11. The electrical connector according to claim 10, wherein: The upper shielding sheet and the lower shielding sheet are arranged at intervals, and a conductive plastic is arranged between the upper opening and the lower opening.

12. The electrical connector according to claim 10, wherein: An upper gap is provided between the upper reflective arm and the edge of the upper opening, a lower gap is provided between the lower reflective arm and the edge of the lower opening, a conductive plastic is provided between the differential signal pair and the ground terminal, the conductive plastic is located between the upper shielding sheet and the lower shielding sheet, wherein the conductive plastic comprises a base, a plurality of upper matching blocks and a plurality of lower matching blocks are provided on the left and right sides of the base respectively, the plurality of upper matching blocks and the plurality of lower matching blocks are staggered along the extension direction of the conductive plastic, the upper matching block is located between the signal fixing portion and the lower gap, and the upper gap is located between the signal fixing portion and the lower matching block.

13. The electrical connector according to claim 1, wherein: The upper shielding sheet is formed with a plurality of upper mating notches, the lower shielding sheet is formed with a plurality of lower mating notches, a conductive plastic comprises a base, and a plurality of upper mating blocks and a plurality of lower mating blocks are respectively arranged on the left and right sides of the base, wherein each upper mating block is mated with each upper mating notch, and each lower mating block is mated with each lower mating notch.

14. The electrical connector according to claim 13, wherein: The upper shielding sheet also includes multiple upper plate portions and multiple upper convex portions, the multiple upper plate portions and the multiple upper convex portions are alternately arranged along the extension direction of the upper shielding sheet, the upper matching recess is arranged on the left and right sides of the upper plate portion, and the upper reflection arm is extended from the upper convex portion to the surface of the adjacent signal fixing portion. The lower shielding sheet also includes multiple lower plate portions and multiple lower convex portions, the multiple lower plate portions and the multiple lower convex portions are alternately arranged along the extension direction of the lower shielding sheet, the lower matching recess is arranged on the left and right sides of the lower plate portion, and the lower reflection arm is extended from the lower convex portion to the surface of the adjacent signal fixing portion, wherein the upper plate portion corresponds to the lower convex portion, and the lower plate portion corresponds to the upper convex portion, and in the left and right directions, the size of the upper reflection arm is larger than the size of the lower plate portion, and the size of the lower reflection arm is larger than the size of the upper plate portion.

15. The electrical connector according to claim 13, wherein: The lower matching block supports the upper convex portion upward, and the lower convex portion supports the upper matching block upward.

16. The electrical connector according to claim 13, wherein: The base of the conductive plastic also includes multiple upper receiving parts and multiple lower receiving parts, the upper receiving parts and the upper matching blocks are alternately arranged along the extension direction of the conductive plastic, and the lower receiving parts and the lower matching blocks are alternately arranged along the extension direction of the conductive plastic, wherein the upper receiving parts limit the upper protrusions, and the lower receiving parts limit the lower protrusions.

17. The electrical connector according to claim 1, wherein: A conductive plastic is arranged between the upper shielding sheet and the lower shielding sheet, and the maximum thickness of the conductive plastic does not exceed the surface of the upper shielding sheet facing the adjacent signal fixing portion upwards, nor does it exceed the surface of the lower shielding sheet facing the adjacent signal fixing portion downwards.

18. The electrical connector according to claim 1, wherein: One side of a conductive plastic connects the upper shielding sheet to the lower shielding sheet, and the other side of the conductive plastic is connected to the ground terminal. The signal fixing portion of at least one differential signal pair is located in a shielding space enclosed by an upper shielding sheet and a lower shielding sheet adjacent to it, and the conductive plastics adjacent to it on the left and right, and the ground terminal.

19. The electrical connector according to claim 1, wherein: Each signal fixing part and each upper shielding piece and each lower shielding piece are fixed to a signal holder, each signal holder is provided with a plurality of upper limit slots and lower limit slots, each upper reflection arm is limited to at least one upper limit slot, and each lower reflection arm is limited to at least one lower limit slot.

20. The electrical connector according to claim 1, wherein: Each signal fixing part is fixed to a signal holding frame, each upper shielding sheet and each lower shielding sheet are fixed to two adjacent signal holding frames, and each signal holding frame is provided with a supporting part, which is located between the upper shielding sheet and the lower shielding sheet.

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