TWI852066B - Power transmission line - Google Patents

Abstract

The present invention relates to an electric transmission line, which has a conductive line layer and a pad layer, and mainly includes: at least a first differential pad, a second differential pad, a first differential line, a second differential line, a first extension line, a second extension line, a first reference line, and a second reference line, and the width of the first and second differential pads is the differential pad width, and the width of the first and second differential lines is the differential line width. The differential pad width of the first differential pad is smaller than the differential line width of the first differential line, and the differential pad width of the second differential pad is smaller than the differential line width of the second differential line, thereby increasing the magnetic flux of the electric transmission line, reducing insertion loss, reducing reflection loss, optimizing thermal conduction, and optimizing impedance matching.

Description

Electric transmission lines

The present invention provides a power transmission line that optimizes the transmission quality by redesigning the width and gap relationship between the transmission line layer and the pad layer of the high-frequency terminal to reduce insertion loss and reflection loss.

According to the standard, an electrical connector is a conductive device that connects electrical circuits. It can be used as an endpoint for connecting different components in the same circuit system, or as a contact point for providing power and signals between different circuit systems and devices. When power or signals pass through the contact point, they will inevitably enter the electrical transmission line in the circuit system or device. The electrical transmission line is generally a part of the circuit substrate, usually in the form of copper foil in a printed circuit board (PCB) or in the form of copper wire in a flexible printed circuit board (FPC). The copper foil or copper wire has a solder pad, or pad, that contacts the electrical connector.

Although common electrical connectors can use terminal arrangement, iron shell shielding, terminal thickness and other methods to shield noise and reduce interference, thereby optimizing the transmission of high-frequency signals, when the signal is transmitted from the electrical connector as a contact to the power transmission line, not only does it lose the optimized design of the electrical connector instantly, but also the improper connection between the terminal and the pad generates a capacitance effect, causing signal attenuation and reflection loss. Even when the signal is transmitted from the pad of the power transmission line to the copper foil or copper wire, the signal is further weakened or distorted due to factors such as poor impedance matching, excessive voltage drop, and excessive temperature rise.

As the transmission speed increases, the impact of this problem becomes more and more obvious. Therefore, how to solve the above-mentioned problems and deficiencies is the direction that the inventor of this invention and related manufacturers in this industry are eager to study and improve.

Therefore, in view of the above-mentioned deficiencies, the inventor of the present invention has collected relevant data, evaluated and considered various aspects, and used the years of experience accumulated in this industry, through continuous trials and modifications, to design this kind of invention patent for the electric transmission line that reduces insertion loss and reflection loss by redesigning the width and gap relationship of the transmission line layer and the pad layer of the high-frequency terminal to achieve the purpose of optimizing the transmission quality.

The main purpose of the present invention is to utilize the width and gap relationship between the first and second differential lines and the first and second differential pads to reduce insertion loss and reflection loss, thereby achieving the purpose of optimizing transmission quality.

To achieve the above-mentioned purpose, the electric transmission line of the present invention has a conductive line layer and a pad layer disposed on the conductive line layer, which mainly includes: at least one first differential pad formed in the pad layer, a second differential pad formed at a distance from one side of the first differential pad and formed in the pad layer, a first differential line formed in the conductive line layer and corresponding to the first differential pad, a second differential line formed in the conductive line layer and corresponding to the second differential pad, and a first differential line extending from the first differential line. A first extension line at one end of the circuit, a second extension line extending at one end of the second differential line, a first reference line formed at a spacing on the first differential line away from the second differential line, and a second reference line formed at a spacing on the second differential line away from the first differential line, and the width of the first differential pad and the second differential pad is the differential pad width, the width of the first differential line and the second differential line is the differential line width, wherein the differential pad width is smaller than the differential line width. This increases the magnetic flux of the electric transmission line, reduces insertion loss, reduces reflection loss, optimizes thermal conduction, and optimizes impedance matching.

The above technology can overcome the problems of signal attenuation, reflection loss, poor impedance matching, and excessive voltage drop at the joints of terminals, solder pads, copper foil, etc. when the signal is transmitted from the electrical connector to the electrical transmission line, thereby achieving the practical progress of the above advantages.

1: Conductive circuit layer

11: First differential line

111: First extension line

12: Second differential line

121: Second extension line

13: First reference circuit

131: Ground reference terminal

14: Second reference circuit

2: Solder pad layer

21: First differential pad

22: Second differential pad

23: First reference pad

24: Second reference pad

3: Paint layer

4: Lower paint layer

5:Electrical connector

6: Differential terminal

61: Bend connection part

62: Plane welding section

A: Differential pad width

B: Differential line width

C: Extended line width

D: Differential gap width

E: Differential reference gap

F: Extended reference gap

GL: Length of welding section

GW: Welding width

H: Terminal grounding distance

I: Line grounding distance

J: Differential pad length

K: Differential convex width

L: Differential convex width

M: Reference pad width

N: Reference line width

N1: Reference inner convex width

N2: Reference convex width

The first figure is a three-dimensional perspective view of a preferred embodiment of the present invention.

The second figure is a disassembled diagram of a preferred embodiment of the present invention.

The third figure is a plan view of a preferred embodiment of the present invention.

The fourth figure is a three-dimensional perspective view of another preferred embodiment of the present invention.

The fifth figure is a cross-sectional view taken along the A-A line of the fourth figure of another preferred embodiment of the present invention.

Figure 6 is a plan view of another preferred embodiment of the present invention.

Figure 7 is a schematic diagram showing the dimensions of another preferred embodiment of the present invention (I).

Figure 8 is a schematic diagram showing the dimensions of another preferred embodiment of the present invention (II).

In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the present invention are described in detail in the following figure for the preferred embodiment of the present invention, and its features and functions are explained for complete understanding.

Please refer to the first to third figures, which are three-dimensional perspective views and plan views of the preferred embodiments of the present invention, wherein the third figure is a plan view with the paint layer 3 hidden. It can be clearly seen from the figure that the electric transmission line of the present invention has a conductive line layer 1 and a solder pad layer 2 disposed on the conductive line layer 1, wherein the conductive line layer 1 is a copper foil, and the solder pad layer 2 is a solder pad, and the electric transmission line mainly includes:

At least one first differential pad 21 is formed in the pad layer 2;

A second differential pad 22 is formed in the pad layer 2 and is spaced apart from one side of the first differential pad 21, and the width of the first differential pad 21 and the second differential pad 22 is the differential pad width A;

A first differential circuit 11 is formed in the conductive circuit layer 1 and its position corresponds to the first differential pad 21;

A second differential line 12 is formed in the conductive line layer 1 and is located corresponding to the second differential pad 22, and the width of the first differential line 11 and the second differential line 12 is the differential line width B, the gap between the first differential line 11 and the second differential line 12 is the differential gap width D, and the differential pad width A is smaller than the differential line width B;

A first extension line 111 is formed extending from one end of the first differential line 11;

A second extension line 121 is extended and formed at one end of the second differential line 12, and the width of the first extension line 111 and the second extension line 121 is the extension line width C, and the differential pad width A is smaller than the extension line width C, and the differential line width B is smaller than the extension line width C;

A first reference circuit 13 is formed at intervals on the side of the first differential circuit 11 away from the second differential circuit 12; and

A second reference line 14 is formed at intervals on the side of the second differential line 12 away from the first differential line 11. The gap between the first differential line 11 and the first reference line 13, and the gap between the second differential line 12 and the second reference line 14 are differential reference gaps E. The gap between the first extension line 111 and the first reference line 13, and the gap between the second extension line 121 and the second reference line 14 are extended reference gaps F. The differential gap width D is smaller than the differential reference gap E, the differential gap width D is smaller than the extended reference gap F, and the differential reference gap E is larger than the extended reference gap F.

Through the above-mentioned component assembly, it can be clearly seen from the figure that the electric transmission line of this embodiment is in the form of a printed circuit board, so the electric transmission line also has an upper paint layer 3 located on the upper surface and a lower paint layer 4 located on the lower surface. The word "differential" in the first differential pad 21, the second differential pad 22, the first differential line 11, and the second differential line 12 corresponds to the differential of the high-frequency differential signal terminal in the USB Type C connector. Therefore, any electrical connection line corresponding to the connector with a high-frequency differential signal terminal should belong to the scope of the present invention. For example, when the number of the first differential pad 21 is one, it is a USB Type A connector, and when the number of the first differential pad 21 is plural, it is a USB Type C connector.

The present invention is to design the differential pad width A in the electric transmission line to be smaller than the differential line width B, and to design the differential pad width A in the electric transmission line to be smaller than the extended line width C, and even to design the differential line width B in the electric transmission line to be smaller than the extended line width C at the same time, so that when the high-frequency signal is transmitted from the high-frequency terminal to the electric transmission line, the first differential pad 21 and the second differential pad 22 are connected to the electric transmission line. The width from the pad 22 to the first differential line 11, the second differential line 12, and even to the first extension line 111 and the second extension line 121 is getting wider and wider. Compared with the conventional practice of making the width of the electrical transmission line the same from beginning to end, the present invention can reduce signal attenuation, reduce voltage drop, and optimize thermal conduction during the high-frequency signal transmission process.

In addition, the present invention designs the differential gap width D in the electric transmission line to be smaller than the differential reference gap E, designs the differential gap width D in the electric transmission line to be smaller than the extended reference gap F, and even makes the differential reference gap E in the electric transmission line larger than the extended reference gap F, so that the high-frequency signal can be well coupled due to the minimization of the differential gap width D. Furthermore, since the first differential line 11 and the second differential line 12 have the first differential pad 21 and the second differential pad 22 respectively, the thickness of the first differential line 11 and the second differential line 12 is thicker, resulting in a lower impedance of this part. Therefore, in addition to optimizing the coupling of the high-frequency signal, the first differential line 11 and the second differential line 12 are also widened. The gap widths on both sides of the first differential line 12 are adjusted to make the differential gap width D smaller than the differential reference gap E, and to make the differential reference gap E larger than the extended reference gap F, thereby balancing the impedance. Therefore, when the high-frequency signal is transmitted from the first differential line 11 and the second differential line 12 and transmitted to the first extended pad far away from the first differential pad 21 and the second differential pad 22, The process of extending the line 111 and the second extension line 121 is a state where the width becomes wider and wider, that is, the differential gap width D is smaller than the extension reference gap F. Compared with the conventional practice of making the width of the electrical transmission line the same from beginning to end, the present invention can further enhance the characteristics of reducing signal attenuation, reducing voltage drop, and optimizing thermal conduction in the process of high-frequency signal transmission.

Please refer to Figures 4 to 6 at the same time, which are three-dimensional perspective views and plan views of another preferred embodiment of the present invention, wherein Figure 6 is a plan view with the paint layer hidden, and the field of view is locked near the first reference pad 23, the first differential pad 21, the second differential pad 22, and the second reference pad 24. It can be clearly seen from the figure that the electric transmission line of the present invention has a conductive line layer 1 and a pad layer 2 disposed on the conductive line layer 1, wherein the conductive line layer 1 is a copper foil, and the pad layer 2 is a pad. The difference between this embodiment and the above embodiment is that the electric transmission line also includes:

The length of the first differential pad 21 and the length of the second differential pad 22 are defined as the differential pad length J;

The portion of the first differential circuit 11 that protrudes from the first differential pad 21 and is adjacent to one side of the second differential circuit 12 in the width direction is defined as the differential inner convex width K;

The portion of the first differential line 11 protruding from the first differential pad 21 and adjacent to one side of the first reference line 13 in the width direction is defined as the differential outer convex width L, and the differential inner convex width K is greater than the differential outer convex width L;

Define the width of the first reference line 13 and the second reference line 14 as the reference line width N;

An electrical connector 5 is provided on the electrical transmission line;

A ground reference terminal 131 is formed extending on one side of the first reference line 13 and located on one side of the electrical connector 5. The shortest distance between the first differential line 11 and the ground reference terminal 131, and the shortest distance between the second differential line 12 and the ground reference terminal 131 are the line grounding distance I;

A plurality of differential terminals 6, each of which is disposed on the electrical connector 5 and includes a bent connection portion 61 extending from the electrical connector 5, and a planar welding portion 62 extending from one end of the bent connection portion 61, and the shortest distance between the planar welding portion 62 and the ground reference terminal 131 is the terminal grounding distance H, the length of the planar welding portion 62 is the welding portion length GL, the width of the planar welding portion 62 is the welding portion width GW, and the terminal grounding distance H is less than or equal to the line grounding distance I, twice the welding portion length GL is less than or equal to the differential pad length J, and the welding portion width GW is equal to the differential pad width A; and

A first reference pad 23 is formed in the pad layer 2 and is located corresponding to the first reference circuit 13;

A second reference pad 24 is formed in the pad layer 2 and is located corresponding to the second reference circuit 14. The widths of the first reference pad 23 and the second reference pad 24 are the reference pad width M. The reference circuit width N is greater than the reference pad width M. In addition, the portion of the first reference circuit 13 protruding from the first reference pad 23 and adjacent to the first differential circuit 11 in the width direction is the reference inner convex width N1. The portion of the first reference circuit 13 protruding from the first reference pad 23 and away from the first differential circuit 11 in the width direction is the reference inner convex width N2. The reference outer convex width N2 is similarly the portion of the second reference circuit 14 protruding from the second reference pad 24 and adjacent to the second differential circuit 12 in the width direction as the reference inner convex width N1, and the portion of the second reference circuit 14 protruding from the second reference pad 24 and away from the second differential circuit 12 in the width direction as the reference outer convex width N2, so that the reference inner convex width N1 at the first reference circuit 13 is less than or equal to the reference outer convex width N2, and the reference inner convex width N1 at the second reference circuit 14 is less than or equal to the reference outer convex width N2.

First, since the welding portion width GW is equal to the differential pad width A, and the terminal grounding distance H is designed to be less than or equal to the line grounding distance I, when the high-frequency signal is transmitted from the planar welding portion 62 to the first differential line 11 and the second differential line 12, the signal can be prevented from moving in the opposite direction of the ground reference terminal 131, thereby avoiding reflection loss and the occurrence of capacitance effect, thereby reducing signal attenuation and low impedance problems. In this embodiment, the terminal grounding distance H is smaller than the line grounding distance I as an example.

The twice of the welding portion length GL is less than or equal to the differential pad length J, that is, 2GL≦J, and J-GL≧GL. In other words, the length of the first differential pad 21 and the second differential pad 22 exposed outside the planar welding portion 62 is greater than or equal to the welding portion length GL, thereby reducing signal attenuation, reducing voltage drop, and increasing the heat conduction area. This embodiment takes the case where twice of the welding portion length GL is equal to the differential pad length J as an example.

Furthermore, in addition to designing the differential pad width A to be smaller than the differential line width B, the present embodiment further designs the differential inner convex width K to be larger than the differential outer convex width L. The principle is equivalent to making the differential gap width D smaller than the differential reference gap E. Since the first differential line 11 and the second differential line 1 2 have the first differential pad 21 and the second differential pad 22, respectively, the first differential line 11 and the second differential line 1 2 have the first differential pad 21 and the second differential pad 22, respectively. The thickness of the second differential line 12 is thicker, resulting in a lower impedance in this part. Therefore, the impedance between the first differential pad 21 and the second differential pad 22, and the impedance between the first differential line 11 and the first reference line 13, and the impedance between the second differential line 12 and the second reference line 14 are balanced by adjusting the differential inner convex width K, the differential outer convex width L, the differential gap width D, and the differential reference gap E. In particular, for the latter, the reference line width N can be designed to be greater than the reference pad width M. This design can be used to cope with large current design without increasing the first reference pad 23 or the second reference pad 24. The reference inner convex width N1 can even be further designed to be less than or equal to the reference outer convex width N2, thereby ensuring that the width of the differential reference gap E is large enough, and further improving the optimization of impedance adjustment. In this embodiment, the differential outer convex width L is greater than 0 and the reference inner convex width N1 is equal to the reference outer convex width N2 as an example.

Please refer to FIG. 7 and FIG. 8 at the same time, which are the dimension marking diagram (I) and the dimension marking diagram (II) of another preferred embodiment of the present invention. It can be clearly seen from the figures that the present embodiment is similar to the above-mentioned embodiment, except that the terminal grounding distance H is designed to be equal to the line grounding distance I as an example, so that the plane welding portion 62 can be completely welded to the first differential welding pad 21. In the case of the first differential pad 21 and the second differential pad 22, the differential signal is prevented from moving in the opposite direction, and the twice of the length of the welding portion GL is less than the differential pad length J as an example, thereby increasing the area of the first differential pad 21 and the second differential pad 22 again, and taking the reference inner convex width N1 as an example to be designed to be less than the reference outer convex width N2, thereby increasing the differential reference gap E again to balance the impedance.

However, the above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all simple modifications and equivalent structural changes made by using the contents of the present invention's specification and drawings should be included in the patent scope of the present invention and should be stated.

In summary, the electric transmission line of this invention can achieve its effect and purpose when used. Therefore, this invention is truly an invention with excellent practicality. In order to meet the application requirements of invention patents, an application is filed in accordance with the law. I hope that the review committee will approve this invention as soon as possible to protect the inventor's hard work. If the review committee of the Jun Bureau has any doubts, please feel free to write to give instructions. The inventor will do his best to cooperate and will be grateful for the convenience.

1: Conductive circuit layer

11: First differential line

111: First extension line

12: Second differential line

121: Second extension line

13: First reference circuit

14: Second reference circuit

2: Solder pad layer

21: First differential pad

22: Second differential pad

A: Differential pad width

B: Differential line width

C: Extended line width

D: Differential gap width

E: Differential reference gap

F: Extended reference gap

Claims (12)

An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit; and A second reference line is formed at intervals on a side of the second differential line away from the first differential line. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed by extending from one end of the second differential line, and the width of the first extension line and the second extension line is the extension line width, and the differential pad width is smaller than the extension line width; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit ; and A second reference line is formed at intervals on a side of the second differential line away from the first differential line. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed by extending at one end of the second differential line, and the width of the first extension line and the second extension line is the extension line width, and the differential line width is smaller than the extension line width; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit; and A second reference line is formed at intervals on a side of the second differential line away from the first differential line. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, the gap between the first differential line and the second differential line is the differential gap width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit; and A second reference line is formed at a distance from the second differential line on a side away from the first differential line. The gap between the first differential line and the first reference line, and the gap between the second differential line and the second reference line are differential reference gaps, and the width of the differential gap is smaller than the differential reference gap. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, the gap between the first differential line and the second differential line is the differential gap width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit; and A second reference line is formed at a distance from the second differential line on a side away from the first differential line. The gap between the first extension line and the first reference line and the gap between the second extension line and the second reference line are extended reference gaps. The differential gap width is smaller than the extended reference gap. An electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad , and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on the side of the first differential circuit away from the second differential circuit; and A second reference circuit is formed at a distance from the second differential circuit on a side away from the first differential circuit. The gap between the first differential circuit and the first reference circuit, and the gap between the second differential circuit and the second reference circuit are differential reference gaps. The gap between the first extension circuit and the first reference circuit, and the gap between the second extension circuit and the second reference circuit are extended reference gaps. The differential reference gap is larger than the extended reference gap. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on a side of the first differential circuit away from the second differential circuit; A second reference circuit is formed at intervals on a side of the second differential circuit away from the first differential circuit; An electrical connector is provided on the electrical transmission line; A ground reference terminal is formed extending from one side of the first reference line and located on one side of the electrical connector, the shortest distance between the first differential line and the ground reference terminal, and the shortest distance between the second differential line and the ground reference terminal is the line ground distance; and A plurality of differential terminals, each of which is disposed on the electrical connector and includes a bent connection portion extending from the electrical connector, and a planar welding portion extending from one end of the bent connection portion, and the shortest distance between the planar welding portion and the ground reference end is the terminal grounding distance, and the terminal grounding distance is less than or equal to the line grounding distance. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad is formed in the pad layer; A second differential pad is formed in the pad layer and is spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width, and the length of the first differential pad and the length of the second differential pad is the differential pad length; A first differential circuit is formed in the conductive circuit layer and is located corresponding to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on a side of the first differential circuit away from the second differential circuit; A second reference circuit is formed at intervals on the side of the second differential circuit away from the first differential circuit; An electrical connector provided on the electrical transmission line; and A plurality of differential terminals, each of which is disposed on the electrical connector and includes a bent connection portion extending from the electrical connector, and a planar welding portion extending from one end of the bent connection portion, the length of the planar welding portion is the welding portion length, and twice the welding portion length is less than or equal to the differential pad length. An electric transmission line, the electric transmission line having a conductive line layer and a pad layer disposed on the conductive line layer, mainly comprising: At least one first differential pad formed in the pad layer; a second differential pad formed in the pad layer and spaced apart on one side of the first differential pad, and the widths of the first differential pad and the second differential pad is the differential pad width; a first differential line is formed in the conductive line layer and corresponds to the first differential pad; a second differential line is formed in the conductive line layer and corresponds to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width. width; a first extension line extending from one end of the first differential line; a second extension line extending from one end of the second differential line; a first reference line spaced from one side of the first differential line away from the second differential line; a second reference line spaced from one side of the second differential line away from the first differential line; an electrical connector disposed on the electrical transmission line; and a plurality of differential terminals, each of which is disposed on the electrical connector and includes a bent connection portion extending from the electrical connector, and a planar welding portion extending from one end of the bent connection portion, the width of the planar welding portion being the welding portion width, and the welding portion width being equal to the differential pad width. An electric transmission line has a conductive line layer and a pad layer disposed on the conductive line layer, and mainly includes: at least one first differential pad formed in the pad layer; a second differential pad formed in the pad layer and spaced apart from one side of the first differential pad; and the widths of the first differential pad and the second differential pad are is the differential pad width; a first differential line is formed in the conductive line layer and corresponds to the first differential pad; a second differential line is formed in the conductive line layer and corresponds to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width The first differential line protrudes from the first differential pad and is adjacent to one side of the second differential line in the width direction as the differential inner convex width; a first extension line is formed by extension at one end of the first differential line; a second extension line is formed by extension at one end of the second differential line; a first reference line is formed at intervals on the side of the first differential line away from the second differential line, the first differential line protrudes from the first differential pad and is adjacent to one side of the first reference line in the width direction as the differential outer convex width, and the differential inner convex width is greater than the differential outer convex width; and a second reference line is formed at intervals on the side of the second differential line away from the first differential line. An electric transmission line has a conductive line layer and a pad layer disposed on the conductive line layer, and mainly includes: at least one first differential pad formed in the pad layer; a second differential pad formed in the pad layer and spaced apart from one side of the first differential pad, and the width of the first differential pad and the second differential pad is equal to the width of the differential pad. pad width; a first differential line is formed in the conductive line layer and corresponds to the first differential pad; a second differential line is formed in the conductive line layer and corresponds to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the width of the differential pad is smaller than the differential line width; a first extension line is extended and formed at one end of the first differential line; a second extension line is extended and formed at one end of the second differential line; a first reference line is spaced and formed on a side of the first differential line away from the second differential line; a second reference line is spaced and formed on a side of the second differential line away from the first differential line, and the first reference line and the second reference line are spaced and formed on a side of the second differential line away from the first differential line. The width of the circuit is the reference circuit width; a first reference pad is formed in the pad layer and corresponds to the first reference circuit; and a second reference pad is formed in the pad layer and corresponds to the second reference circuit. The width of the first reference pad and the second reference pad is the reference pad width, and the reference circuit width is greater than the reference pad width. An electric transmission line, the electric transmission line has a conductive line layer and a pad layer disposed on the conductive line layer, which mainly includes: at least one first differential pad formed in the pad layer; a second differential pad formed in the pad layer and spaced apart on one side of the first differential pad, and the width of the first differential pad and the second differential pad is the differential pad width; a first differential line formed in the conductive line layer and corresponding in position to the first differential pad; A second differential line is formed in the conductive line layer and is located corresponding to the second differential pad, and the width of the first differential line and the second differential line is the differential line width, and the differential pad width is smaller than the differential line width; A first extension line is formed extending from one end of the first differential line; A second extension line is formed extending from one end of the second differential line; A first reference circuit is formed at intervals on a side of the first differential circuit away from the second differential circuit; A second reference line is formed at intervals on the side of the second differential line away from the first differential line, and the width of the first reference line and the second reference line is the reference line width; A first reference pad is formed in the pad layer and is located corresponding to the first reference circuit; and A second reference pad is formed in the pad layer and corresponds to the second reference circuit. The width of the first reference pad and the second reference pad is the reference pad width, and the reference circuit width is greater than the reference pad width. In addition, the portion of the first reference circuit protruding from the first reference pad and adjacent to one side of the first differential circuit in the width direction is the reference inner convex width, and the portion of the first reference circuit protruding from the first reference pad and away from one side of the first differential circuit in the width direction is the reference outer convex width, and the reference inner convex width is less than or equal to the reference outer convex width.

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