CN115832789A

CN115832789A - Signal transmission device

Info

Publication number: CN115832789A
Application number: CN202111094227.3A
Authority: CN
Inventors: 叶时堃
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-03-21

Abstract

The signal transmission device at least comprises a flat cable, at least one conducting piece and a connecting device, wherein the flat cable is sequentially laminated with a conductor layer, a metal layer and an insulating layer, the conductor layer comprises a plurality of signal wires, each signal wire has a preset width, and a preset distance is formed between each signal wire; if the number of the conduction pieces is multiple, the conduction pieces are spaced at a specific interval and respectively comprise a first contact end and a second contact end, and the first contact end is electrically contacted with the metal layer; the connecting device is electrically connected to the flat cable and comprises a plurality of signal conducting wires and a plurality of grounding wires, the number of the signal conducting wires corresponds to the number of the signal wires and the signal conducting wires are electrically contacted with each other, the number of the grounding wires corresponds to the number of the conducting pieces, and the second contact end is electrically contacted with each grounding wire.

Description

Signal transmission device

Technical Field

The present invention relates to signal transmission technology, and more particularly to a signal transmission device capable of effectively improving signal transmission efficiency by improving the grounding structure design.

Background

The general signal transmission device includes a flat cable (e.g. signal transmission lines such as PCIE specification bus and SATA specification bus for computer) and connectors respectively disposed at two ends of the flat cable, the connectors are electrically connected to the flat cable and connected to corresponding connectors of external devices (e.g. male and female corresponding connectors), and signals are transmitted between the external devices through the signal lines in the flat cable and through the connectors.

Referring to fig. 1 and 2, fig. 1 isbase:Sub>A plan view ofbase:Sub>A conventional flat cable, and fig. 2 isbase:Sub>A cross-sectional view taken alongbase:Sub>A cross-section of fig. 1A-base:Sub>A. As shown in fig. 1 and 2, the conventional flat cable 9 is laminated with a conductive layer 91, a foam layer 92, a metal layer 93, an insulating layer 94, and the like, and the conductive layer 91 is provided with a plurality of signal lines 911 and a plurality of ground lines 912. Conventionally, two signal lines 911 are matched with a ground line 912, so as to be repeatedly arranged into a flat cable 9 with a standard width, for example, a flat cable 9 with a standard width of forty-eight lines or seventy-two lines.

As described above, since the conductive layer 91 of the conventional flat cable 9 has the grounding line 912, the width of the signal line 911 is limited under the condition that the flat cable 9 has a standard width, thereby reducing the transmission rate. Therefore, the structure of the flat cable 9 must be designed properly, and the so-called skin effect and characteristic impedance must be considered in design.

The skin effect is also called as skin effect, and it is a phenomenon that when there is an alternating current or an alternating electromagnetic field in a conductor (such as the signal line 911), the current distribution inside the conductor is not uniform, and the current density inside the conductor exponentially decays with the distance from the surface of the conductor, that is, the current inside the conductor is concentrated on the surface of the conductor, when viewed from a cross section perpendicular to the current direction, almost no current flows through the center portion of the conductor, and only the current flows at the edge portion of the conductor, in short, the current is concentrated on the skin portion of the conductor. Since the skin effect causes the alternating current to pass only through the surface of the conductor, the current generates a thermal effect only on the surface of the conductor, and thus, for example, in the steel industry, the skin effect can be utilized to perform surface quenching on steel, so that the hardness of the steel surface is increased. The skin effect can be mitigated, for example, by using so-called litz wires, i.e., by winding a plurality of metal wires around each other so that the electromagnetic field is distributed relatively uniformly; or the solid conductor can be replaced by a hollow conductor tube, and the middle of the hollow conductor tube is supplemented with an insulating material.

In addition, the characteristic impedance refers to the resistance encountered when a high-frequency signal or an electromagnetic wave propagates through a conductor, and is expressed in ohm. The fluctuation of the impedance values in the conductors must be controlled so that signals can be transmitted at a correct speed, and there are different impedance calculation formulas for transmission lines formed by different types of conductors (such as coaxial transmission lines, line-type transmission lines, microstrip transmission lines, coplanar transmission lines, etc.). The impedance control can be achieved by changing different design conditions, such as changing the material, thickness and dielectric constant of the foam layer in the transmission line.

In summary, under the above principle, the widening of the width of the signal line 91 can be made to be a factor of increasing the transmission distance and the transmission rate of the signal line 911 by setting different design conditions. In other words, the improvement of transmission efficiency is very important in the current technological development, so it is an urgent need to solve the problem of how to increase the transmission efficiency by widening the width of the conventional signal line 911 under the condition of the specification width of the flat cable 9 and still maintain the grounding effect of the flat cable 9.

Disclosure of Invention

In order to solve the problem of the conventional signal transmission device that the transmission efficiency is reduced due to the limitation of the specification width of the flat cable, the signal transmission device provided by the invention widens the width of the signal line of the flat cable for transmitting signals by using an improved grounding structure design, thereby effectively achieving the purpose of improving the signal transmission efficiency.

The signal transmission device provided by the invention at least comprises a flat cable, at least one conducting piece and a connecting device. The flat cable is sequentially laminated with a conductor layer, a metal layer and an insulating layer, wherein the conductor layer comprises a plurality of signal lines, each signal line of the plurality of signal lines is respectively provided with a preset width, and each signal line of the plurality of signal lines is mutually separated by a preset interval; the conducting piece comprises a first contact end and a second contact end, and the first contact end of the conducting piece is electrically contacted with the metal layer; the connecting device is electrically connected to the flat cable and comprises a plurality of signal conducting wires and a plurality of grounding wires, the number of the signal conducting wires corresponds to the number of the signal wires and the signal conducting wires are electrically contacted with each other, the number of the grounding wires corresponds to the number of the grounding wires, the grounding wires are electrically contacted with the conducting pieces, and the second contact ends of the conducting pieces are electrically contacted with each grounding wire.

As mentioned above, the signal transmission device provided by the present invention has a structure design in which a plurality of conductive elements are directly and electrically contacted with the metal layer of the flat cable, thereby serving as a grounding structure design. In other words, the conductive layer of the flat cable may only have the signal line without the ground line, so that even under the condition of the specification width of the flat cable, the width of the signal line may be widened, thereby effectively achieving the purpose of improving the signal transmission efficiency.

Optionally, in one non-limiting exemplary embodiment, the predetermined width is between 0.4 mm and 1.0 mm; the predetermined distance is between 0.4 mm and 1.2 mm.

Alternatively, in a non-limiting exemplary embodiment, the conductive element is a sheet-shaped conductive adhesive, and the first contact end and the second contact end are opposite sides of the sheet-shaped conductive adhesive.

Optionally, in a non-limiting exemplary embodiment, the flat cable further includes a low dielectric constant layer, and the low dielectric constant layer is stacked between the conductive layer and the metal layer; the material of the low dielectric constant layer is one of polypropylene (PP), polyethylene (PE), non-woven fabric and Teflon.

Optionally, in a non-limiting exemplary embodiment, each of the plurality of signal conducting wires and each of the plurality of signal wires are electrically contacted with each other through a conductive adhesive.

Optionally, in a non-limiting exemplary embodiment, each of the plurality of signal transmission lines has a length greater than that of each of the plurality of ground lines.

Optionally, in a non-limiting exemplary embodiment, each of the plurality of signal conducting wires includes an elongated body and a rectangular head connected to each other, and the rectangular head is outwardly expanded relative to the elongated body.

Optionally, in one non-limiting exemplary embodiment, the flex Cable is a Flexible Flat Cable (FFC).

The invention also provides a signal transmission device, which at least comprises a flat cable, a connector, a plurality of conductive members and a connecting device. The flat cable is sequentially laminated with a conductor layer, a metal layer and an insulating layer, wherein the conductor layer comprises a plurality of signal lines, each signal line of the plurality of signal lines is respectively provided with a preset width, and each signal line of the plurality of signal lines is mutually separated by a preset interval; the connector includes an upper member and a lower member joined to each other; the plurality of conducting pieces are arranged between the upper part and the lower part at intervals of a specific distance, each of the plurality of conducting pieces comprises a first contact end and a second contact end, and the first contact end of each of the plurality of conducting pieces is electrically contacted with the metal layer; the connecting device is electrically connected to the flat cable and comprises a plurality of signal conducting wires and a plurality of grounding wires, the number of the signal conducting wires corresponds to the number of the signal wires and the signal conducting wires are electrically contacted with each other, the number of the grounding wires corresponds to the number of the conducting pieces, and the second contact end of each conducting piece is electrically contacted with each grounding wire.

As mentioned above, optionally, in one non-limiting exemplary embodiment, the predetermined width is between 0.4 mm and 1.0 mm; the preset distance is between 0.4 mm and 1.2 mm; the specific spacing is between 0.2 mm and 2.7 mm.

Optionally, in a non-limiting exemplary embodiment, at least one of the upper component and the lower component includes a plurality of grooves spaced apart from each other, the number of the plurality of grooves corresponds to the number of the plurality of conductive elements, and each of the plurality of conductive elements is a rod-shaped conductive strip and is disposed in each of the plurality of grooves.

Optionally, in a non-limiting exemplary embodiment, the upper member and the lower member are respectively rectangular, and one of the upper member and the lower member includes a buckle at two ends respectively, and the other of the upper member and the lower member includes a slot at two ends respectively, and the buckle and the slot are correspondingly engaged with each other.

Optionally, in one non-limiting exemplary embodiment, the first contact end of each of the plurality of conductive elements is in the shape of a ridge; the second contact end of each of the plurality of conductive elements is in an arc shape.

As described above, optionally, in a non-limiting embodiment, the flat cable further includes a low dielectric constant layer, and the low dielectric constant layer is stacked between the conductive layer and the metal layer; the material of the low dielectric constant layer is one of polypropylene (PP), polyethylene (PE), non-woven fabric and Teflon.

As mentioned above, optionally, in a non-limiting embodiment, each of the plurality of signal conducting wires and each of the plurality of signal wires are electrically contacted with each other through a conductive adhesive.

As mentioned above, optionally, in a non-limiting embodiment, the length of each of the plurality of signal conducting wires is greater than the length of each of the plurality of grounding wires.

As mentioned above, optionally, in a non-limiting embodiment, each of the plurality of signal transmission lines includes an elongated body and a rectangular head connected to each other, and the rectangular head is flared with respect to the elongated body.

As mentioned above, optionally, in one non-limiting embodiment, the ribbon is a flexible flat ribbon.

As mentioned above, optionally, the plurality of conductive elements are made of an integrally formed conductive body, and the first contact end and the second contact end are formed by stamping.

Drawings

Fig. 1 is a plan view of a conventional flat cable.

FIG. 2 isbase:Sub>A cross-sectional view taken at section A-A of FIG. 1.

Fig. 3 is an exploded view of the first preferred embodiment of the present invention.

FIG. 4 is a cross-sectional view of the first preferred embodiment of the present invention.

Fig. 5 is a perspective view of a second preferred embodiment of the present invention.

FIG. 6 is a perspective view of another angle according to the second preferred embodiment of the present invention.

Fig. 7A is an exploded view of a second preferred embodiment of the present invention.

Fig. 7B is an exploded view of another embodiment of the present invention.

Fig. 8 is a cross-sectional view of a second preferred embodiment of the present invention.

FIG. 9 is a cross-sectional view of a third preferred embodiment of the present invention

Description of the figure numbers:

1: signal transmission device

2: flat cable

21: conductive layer

211: signal line

22: metal layer

23: insulating layer

24: low dielectric constant layer

3: connector with a locking member

31: upper part

310: groove

311: fastener

32: lower part

321: clamping groove

4: conducting piece

41: first contact terminal

42: second contact terminal

5: connecting device

51: signal conducting wire

511: elongated body

512: rectangular head

52: grounding wire

521: grounding terminal

522: ground plane

61: connecting piece

9: flat cable

91: conductive layer

911: signal line

912: grounding wire

92: foam layer

93: metal layer

94: insulating layer

P: preset interval

W: preset width

d: a specific pitch.

Detailed Description

Referring to fig. 3 and fig. 4, fig. 3 is an exploded view of the first preferred embodiment of the present invention, and fig. 4 is a sectional view of the first preferred embodiment of the present invention. In fig. 3 and 4, a signal transmission device 1 is shown, and the signal transmission device 1 includes a flat cable 2 and at least one conducting member 4.

As shown in fig. 3 and 4, the flat cable 2 is sequentially stacked with a conductive layer 21, a metal layer 22 and an insulating layer 23 in the vertical direction, wherein the conductive layer 21 includes a plurality of signal lines 211, each of the plurality of signal lines 211 has a predetermined width W, and each of the plurality of signal lines 211 is spaced from each other by a predetermined pitch P; the conductive element 4 includes a first contact end 41 and a second contact end 42, wherein the first contact end 41 of the conductive element 4 is electrically contacted with the metal layer 22 of the flat cable 2.

The following formula (I) is a transmission characteristic impedance formula of the flat cable:

wherein Z ₀ Is characteristic impedance (characteristic impedance), epsilon _r Is the dielectric constant, W is the line width, H is the height of the insulating layer, and T is the thickness of the conductive layer. In the flat cable 2, if the flat cable 2 has the same thickness and the same dielectric constant, the wider the line width W of the signal line, the better the transmission efficiency. In other words, the flat cable 2 of the present invention does not haveThe grounding structure can widen the line width W of the signal line, so as to make the transmission length of the flat cable 2 longer, and improve the transmission efficiency.

Referring to the difference between the embodiment and the comparative example, according to table 1, the first comparative example is a conventional flat cable having a ground line and a signal line therein, and the width of the signal line is 0.3 millimeter (mm); in an embodiment of the present invention, the flat cable 2 is a flat cable without a ground line, and the predetermined width W of each of the plurality of signal lines 211 may be between 0.4 millimeters (mm) and 1.0 mm (mm) according to the requirement of the actual structure design, and the predetermined interval P between each of the plurality of signal lines 211 may be between 0.4 millimeters (mm) and 1.2 millimeters (mm). Therefore, in the first to fourth embodiments of the present invention, on the premise of the same thickness and the same dielectric constant, when the line width W of the signal line is widened, the transmission length can be longer, and the transmission efficiency is further improved:

bus cable signal line	Line width W (mm)	Transmission Rate (G/s)	Longest transmissible length (M)
				Example one	0.4	6	1.0
Example two	0.5	6	2.0
				EXAMPLE III	0.6	6	2.5
Example four	0.7	6	3.0
				Comparative example 1	0.3	6	0.5

TABLE 1

As shown in fig. 3 and fig. 4, the signal transmission device 1 further includes a connection device 5 in the embodiment, in the embodiment of the present invention, the connection device 5 is a circuit board, and the connection device 5 is electrically connected to the flat cable 2. In addition, the connecting device 5 includes a plurality of signal conducting wires 51 and a plurality of ground wires 52, wherein the number of the plurality of signal conducting wires 51 corresponds to the number of the plurality of signal wires 211 of the conductor layer 21 of the flat cable 2 and are electrically contacted with each other, i.e. one signal conducting wire 51 is electrically contacted with one signal wire 211, for example, electrically contacted with each other through a connecting element 61; in a preferred embodiment of the present invention, the connecting member 61 is preferably solder, and the connecting member 61 is used to connect the signal conducting line 51 and the signal line 211; in addition, the number of the plurality of grounding wires 52 corresponds to the number of the conductive element 4, and the second contact end 42 of the conductive element 4 is electrically contacted with each of the plurality of grounding wires 52. Wherein the connecting device 5 can be any one of a circuit board, a connector, etc.

In the present embodiment, the length of each of the plurality of signal conducting wires 51 of the connecting device 5 is greater than the length of each of the plurality of grounding wires 52, so that the effect of easy identification can be achieved by the difference in length. In addition, in the present embodiment, each of the plurality of signal conducting wires 51 of the connecting device 5 includes an elongated body 511 and a rectangular head 512 connected to each other, and the rectangular head 512 is outwardly extended relative to the elongated body 511, so that the larger area of the rectangular head 512 of the signal conducting wire 51 can be easily electrically contacted with the connecting member 61 and thus the signal wire 211. In another embodiment of the present invention, each of the plurality of ground wires 52 of the connecting device 5 includes a ground terminal 521 connected to each other, and each of the ground terminals is connected to a ground plane 522, the ground plane 522 is electrically contacted with the second contact end 42 of the conductive element 4, and is electrically contacted with the metal layer 22 of the flat cable 2 through the first contact end 41 of the conductive element 4, so as to achieve the ground conduction state.

As shown in fig. 3 and 4, the conductive element 4 is a sheet-shaped conductive adhesive (shown as a rectangular sheet shape) in this embodiment, and the first contact end 41 and the second contact end 42 are opposite sides of the sheet-shaped conductive adhesive. The conductive element 4 is in the form of a sheet-shaped conductive adhesive in the embodiment, but other methods, such as metal spring or solder welding (solder forming the conductive element), may also be used.

As can be seen from the above, the grounding structure of the flat cable 2 is designed by directly using the metal layer 22, that is, the conductive element 4 is electrically contacted with the metal layer 22 of the flat cable 2 and the grounding wire 52 of the connecting device 5 to form the grounding structure, so that the conductive layer 21 of the flat cable 2 can only have the signal line 211 without disposing the grounding wire as in the conventional art, and relatively, under the condition of not affecting the specification width of the flat cable 2, the signal line 211 can have more space to widen the width of the signal line 211, and thus the purpose of improving the signal transmission efficiency can be effectively achieved.

In the present embodiment, the flat cable 2 is a Flexible Flat Cable (FFC), but the flat cable 2 may be a Flexible Printed Circuit (FPC), for example. In addition, the flat cable 2 may further include a low dielectric constant layer 24, the low dielectric constant layer 24 is stacked between the conductive layer 21 and the metal layer 22, and the material of the low dielectric constant layer 24 may be one of polypropylene (PP), polyethylene (PE), non-woven fabric, or teflon. In the manufacture of the flat cable 2, the flat cable 2 may further include a (film) adhesive layer, a (e.g. PET) film layer, etc.

Referring to fig. 5 to 9, fig. 5 is a perspective view of a second preferred embodiment of the present invention, fig. 6 is a perspective view of another perspective view of the second preferred embodiment of the present invention, fig. 7A is an exploded view of the second preferred embodiment of the present invention, fig. 7B is an exploded view of another conductive member structure of the present invention, fig. 8 is a sectional view of the second preferred embodiment of the present invention, and fig. 9 is a sectional view of a third preferred embodiment of the present invention.

In the present embodiment, the main structure is the same as the above first preferred embodiment, except that the signal transmission device 1 further includes a connector 3, the connector 3 includes an upper member 31 and a lower member 32 joined to each other, and each of the plurality of conductive elements 4 is a rod-shaped conductive strip and is disposed between the upper member 31 and the lower member 32.

Similarly, the connecting device 5 is electrically connected to the flat cable 2, and the connecting device 5 includes a plurality of signal conducting wires 51 and a plurality of grounding wires 52, wherein the number of the plurality of signal conducting wires 51 corresponds to the number of the plurality of signal wires 211 and is electrically contacted with each other, the number of the plurality of grounding wires 52 corresponds to the number of the plurality of conductive elements 4, and the second contact end 42 of each of the plurality of conductive elements 4 is electrically contacted with each of the plurality of grounding wires 52.

Like the first preferred embodiment, the present embodiment utilizes the conductive element 4 in the form of rod-shaped conductive strip to electrically contact the metal layer 22 of the flat cable 2 and the ground line 52 of the connecting device 5, respectively, so as to achieve the grounding effect, and similarly, the flat cable 2 does not need to have a ground line, so that the width of the signal line 211 of the flat cable 2 can be widened, thereby achieving the purpose of effectively improving the transmission efficiency.

In the present embodiment, the upper member 31 includes a plurality of grooves 310 spaced apart from each other (of course, the plurality of grooves 310 may also be spaced apart from each other and disposed on the lower member 32, or disposed on both the upper member 31 and the lower member 32), the number of the plurality of grooves 310 corresponds to the number of the plurality of conductive elements 4, and each of the plurality of conductive elements 4 is disposed in each of the plurality of grooves 310, i.e. one conductive element 4 is disposed in one groove 310, for example, the conductive element 4 can be inserted into the grooves 310 in a tight fit manner, and thereby can be prevented from falling.

In the present embodiment, the upper component 31 and the lower component 32 are respectively rectangular, the upper component 31 (the lower component 32) includes a buckle 311 at two ends, the lower component 32 (the upper component 31) includes a slot 321 at two ends, and the buckle 311 and the slot 321 are correspondingly engaged with each other. Of course, the connection manner of the upper part 31 and the lower part 32 is not limited to this, and may be, for example, screw, bolt, or adhesive.

In order to make the plurality of conductive elements 4 electrically contact the metal layer 22 of the flat cable 2 and the ground wire 52 of the connecting device 5 more conveniently, in the embodiment, the first contact end 41 of each of the plurality of conductive elements 4 is in a ridge shape, and the second contact end 42 of each of the plurality of conductive elements 4 is in an arc shape. In other words, the ridge-shaped and arc-shaped structure design can make the first contact end 41 and the second contact end 42 form a protruding point to make electrical contact with the metal layer 22 of the flat cable 2 and the ground line 52 of the connecting device 5 more conveniently. Of course, the shapes of the first contact end 41 and the second contact end 42 of the plurality of conductive elements 4 are not limited to the above, and other shapes, such as a pointed shape, a polygonal shape, etc., are also possible. As shown in fig. 7B, in another embodiment of the present invention, the plurality of conductive elements 4 are made of an integrally formed conductive body (not shown), and the first contact end 41 and the second contact end 42 are formed by stamping; accordingly, the punched conductive body can be directly formed on the upper member 31 or the lower member 32 of the connector 3.

Referring to fig. 9, in another embodiment of the present invention, the signal transmission device is composed of two flat cables 2, a connection device 5 and a connector 3, the connection device 5 is a double-sided connection device, and two surfaces of the double-sided connection device are electrically connected to a flat cable 2 structure respectively, wherein the flat cable 2 is stacked with a conductor layer 21, a metal layer 22 and an insulating layer 23 in sequence in an up-down direction, the conductor layer 21 includes a plurality of signal lines 211, each of the plurality of signal lines 211 has a predetermined width W, and each of the plurality of signal lines 211 is spaced apart from each other by a predetermined pitch P.

Claims

1. A signal transmission device, comprising:

a flat cable (2) sequentially stacked with a conductive layer (21), a metal layer (22) and an insulating layer (23), wherein the conductive layer (21) comprises a plurality of signal lines (211), each of the plurality of signal lines (211) has a preset width (W), and each of the plurality of signal lines (211) is spaced from each other by a preset distance (P);

at least one conducting element (4), wherein the conducting element (4) comprises a first contact end (41) and a second contact end (42), and the first contact ends (41) of the conducting element (4) are respectively electrically contacted with the metal layer (22); and

a connecting device (5) electrically connected to the flat cable (2), wherein the connecting device (5) comprises a plurality of signal conducting wires (51) and a plurality of grounding wires (52), the number of the plurality of signal conducting wires (51) corresponds to the number of the plurality of signal wires (211) and is electrically contacted with each other, the plurality of grounding wires (52) corresponds to and is electrically contacted with the conducting piece (4), and the second contact end (42) of the conducting piece (4) is electrically contacted with each of the plurality of grounding wires (52) respectively.

2. The signal transmission device according to claim 1, wherein the predetermined width (W) is between 0.4 mm and 1.0 mm.

3. The signal transmission device according to claim 1, wherein the predetermined pitch (P) is between 0.4 mm and 1.2 mm.

4. The signal transmission device according to claim 1, wherein the conductive element (4) is a sheet-shaped conductive adhesive, and the first contact end (41) and the second contact end (42) are opposite sides of the sheet-shaped conductive adhesive.

5. The signal transmission device according to claim 1, wherein the flat cable (2) further comprises a low-k layer (24), and the low-k layer (24) is stacked between the conductive layer (21) and the metal layer (22).

6. The signal transmission device according to claim 5, wherein the low dielectric constant layer (24) is made of one of polypropylene, polyethylene or Teflon.

7. The signal transmission device as claimed in claim 1, wherein each of the plurality of signal transmission lines (51) and each of the plurality of signal lines (211) are electrically connected to each other via a connecting element (61).

8. The signal transmission device as claimed in claim 1, wherein each of the plurality of signal transmission lines (51) has a length greater than that of each of the plurality of ground lines (52).

9. The signal transmission device as claimed in claim 1, wherein each of the plurality of signal transmission lines (51) comprises an elongated body (511) and a rectangular head (512) connected to each other, and the rectangular head (512) is flared with respect to the elongated body (511).

10. The signal transmission device according to claim 1, wherein the flat cable (2) is a flexible flat cable.

11. A signal transmission device, comprising:

a connector (3) comprising an upper member (31) and a lower member (32) joined to each other;

a plurality of conductive members (4) spaced apart from each other by a specific distance (d) and disposed between the upper member (31) and the lower member (32), each of the plurality of conductive members (4) including a first contact end (41) and a second contact end (42), the first contact end (41) of each of the plurality of conductive members (4) being electrically contacted to the metal layer (22); and

a connecting device (5) electrically connected to the flat cable (2), wherein the connecting device (5) comprises a plurality of signal conducting wires (51) and a plurality of grounding wires (52), the number of the plurality of signal conducting wires (51) corresponds to the number of the plurality of signal wires (211) and is electrically contacted with each other, the number of the plurality of grounding wires (52) corresponds to the number of the plurality of conducting pieces (4), and the second contact end (42) of each of the plurality of conducting pieces (4) is electrically contacted with each of the plurality of grounding wires (52).

12. The signal transmission device according to claim 11, wherein the predetermined width (W) is between 0.4 mm and 1.0 mm.

13. The signal transmission device according to claim 11, wherein the predetermined pitch (P) is between 0.4 mm and 1.2 mm.

14. The signal transmission device according to claim 11, wherein the specific distance (d) is between 0.2 mm and 2.7 mm.

15. The signal transmission device according to claim 11, wherein at least one of the upper member (31) and the lower member (32) comprises a plurality of grooves (310) spaced apart from each other, the number of the plurality of grooves (310) corresponds to the number of the plurality of conductive elements (4), and each of the plurality of conductive elements (4) is a rod-shaped conductive strip and is disposed in each of the plurality of grooves (310).

16. The signal transmission device according to claim 11, wherein the upper member (31) and the lower member (32) are respectively rectangular, and one of the upper member (31) and the lower member (32) includes a latch (311) at two ends thereof, and the other of the upper member (31) and the lower member (32) includes a slot (321) at two ends thereof, the latch (311) and the slot (321) being engaged with each other correspondingly.

17. The signal transmission device according to claim 11, wherein the first contact end (41) of each of the plurality of conductive elements (4) is in the shape of a ridge.

18. The signal transmission device according to claim 11, wherein the second contact end (42) of each of the plurality of conductive elements (4) is curved.

19. The signal transmission device according to claim 11, wherein the flat cable (2) further includes a low-k layer (24), and the low-k layer (24) is stacked between the conductive layer (21) and the metal layer (22).

20. The signal transmission device according to claim 19, wherein the low dielectric constant layer (24) is made of one of polypropylene, polyethylene or teflon.

21. The signal transmission device as claimed in claim 11, wherein each of the plurality of signal transmission lines (51) and each of the plurality of signal lines (211) are electrically connected to each other via a connection member (61).

22. The signal transmission device as claimed in claim 11, wherein each of the plurality of signal transmission lines (51) has a length greater than that of each of the plurality of ground lines (52).

23. The signal transmission device as claimed in claim 11, wherein each of the plurality of signal transmission lines (51) comprises an elongated body (511) and a rectangular head (512) connected to each other, and the rectangular head (512) is flared with respect to the elongated body (511).

24. The signal transmission device according to claim 11, wherein the flat cable (2) is a flexible flat cable.

25. The signal transmission device according to claim 11, wherein the plurality of conductive elements (4) are formed by integrally forming a conductive body and stamping the first contact end (41) and the second contact end (42).