WO2021119934A1

WO2021119934A1 - Transmission line and terminal device

Info

Publication number: WO2021119934A1
Application number: PCT/CN2019/125693
Authority: WO
Inventors: 詹大伟; 陈勇利; 王建安
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2021-06-24

Abstract

The present invention provides a transmission line and an electronic device. The transmission line comprises a first grounding conductor and a signal layer. The first grounding conductor is provided with at least two connecting regions and at least one grid region sandwiched between the connecting regions. A signal transmission line is provided inside the signal layer, and comprises at least two transmission units and at least one impedance adjustment unit sandwiched between the transmission units. An orthographic projection of the impedance adjustment unit is located in the grid region. The impedance adjustment unit is used for adjusting the impedance of the transmission line. The impedance of the transmission line is adjusted by adjusting the line width of the impedance adjustment unit, which effectively ensures the transmission performance of the transmission line. At the same time, the flexibility of the transmission line in the grid region of the transmission line is stronger, and the risk that the transmission line is bent and broken is reduced.

Description

Transmission line and terminal equipment

Technical field

The invention relates to the field of signal transmission control, in particular to a transmission line and terminal equipment.

Background technique

With the development of 5G (5th generation mobile networks) and consumer electronics technology, the research on multi-antenna technology has a long history. The space available for the layout of traditional radio frequency coaxial transmission lines is getting smaller and smaller, so a new type of transmission structure has emerged; for the design of multi-antenna radio frequency transmission lines, PCB planar circuits or flexible circuits are mainly used for design. Commonly used structures mainly include micro Strip line, coplanar waveguide line, strip line and dielectric integrated waveguide, etc.; integrated terminal equipment space structure, general transmission line modules need to be bent one or more times, and there is a risk of fracture in the narrow bending area, so local or The grid copper design is carried out in a large area; the grid copper structure will destroy the reference ground structure of the transmission line, resulting in impedance mismatch, resulting in performance degradation.

technical problem

The purpose of the present invention is to provide a transmission line that does not affect the transmission performance under bending conditions.

Technical solutions

The technical solution of the present invention is as follows: a transmission line comprising a first grounding conductor and a signal layer; the first grounding conductor is provided with at least two connection areas and at least one connection area sandwiched between the connection areas Grid area; the signal layer is provided with a signal transmission line, the signal transmission line includes at least two transmission parts and at least one impedance adjustment part sandwiched between the transmission parts; the orthographic projection of the impedance adjustment part is located The grid area; the impedance adjusting part is used to adjust the impedance of the transmission line.

Further, the line width of the impedance adjusting part perpendicular to the signal transmission direction is greater than the line width of the transmission part.

Further, the transmission line further includes a second ground conductor, and the second ground conductor is arranged on a side of the signal layer away from the first ground conductor.

Further, the transmission line includes two first ground conductors, the two first ground conductors are arranged opposite to each other, and the signal layer is arranged between the two first ground conductors.

Further, the mesh regions of the two first ground conductors are arranged opposite to each other, and the impedance adjusting portion of the signal line is sandwiched between the two mesh regions.

Further, the grid area includes a plurality of wires, and the plurality of wires are intersected to form a grid structure.

Further, the plurality of wires includes a plurality of first wires and a plurality of second wires, the plurality of first wires and a plurality of second wires are arranged crosswise, the first wires are arranged in parallel along the first straight line, and the second wires It is arranged parallel to the second straight line.

Further, the first straight line is perpendicular to the second straight line.

The present invention also provides a terminal device, which includes the transmission line described in any one of the foregoing.

Beneficial effect

The beneficial effect of the present invention is that by adjusting the line width of the impedance adjusting part, the impedance of the transmission line is adjusted, and the transmission performance of the transmission line is effectively guaranteed. At the same time, the grid area of the transmission line makes the transmission line more flexible, reducing the risk of bending and breaking the transmission line.

Description of the drawings

Figure 1 is a perspective exploded view of a transmission line according to a first embodiment of the present invention;

Figure 2 is a perspective exploded view of a transmission line according to a second embodiment of the present invention;

Figure 3 is a three-dimensional assembly view of the transmission line of the first embodiment of the present invention;

Fig. 4 is an enlarged schematic diagram of the range A in Fig. 3;

Fig. 5 is a graph of the reflection coefficient of an embodiment of the present invention:

Fig. 6 is a graph of transmission coefficients according to an embodiment of the present invention;

Fig. 7 is a graph of impedance of an embodiment of the present invention.

Embodiments of the present invention

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, a person of ordinary skill in the art can understand that, in each embodiment of the present invention, many technical details are proposed for the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by the present invention can be realized.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

It should be noted that the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. . Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the protection scope of the present invention.

The embodiment of the present invention provides a transmission line and terminal equipment. When an antenna is arranged in the terminal equipment, the antenna and the signal processing unit of the terminal equipment need to be electrically connected through the transmission line. In this regard, through this transmission line, an effective transmission layout can be carried out in the limited space of the terminal equipment. Terminal devices include but are not limited to smart phones, tablet computers, and portable wearable devices. To

Please refer to FIG. 1, which is a perspective exploded view of a transmission line according to a first embodiment of the present invention. The transmission line includes a first ground conductor 12 and a signal layer; the first ground conductor 12 is provided with at least two connection areas 10 and At least one grid area 11 sandwiched between the connecting areas 10. A signal transmission line 20 is provided in the signal layer. The signal transmission line 20 includes at least two transmission portions 22 and at least one impedance adjustment portion 21 sandwiched between the transmission portions 22; The projection is located in the grid area 11; the impedance adjusting part 21 is used to adjust the impedance of the transmission line.

Specifically, the signal layer is composed of a signal transmission line 20 and a substrate 23. The signal transmission line 20 is buried in the substrate 23, and the impedance of the transmission line is adjusted by adjusting the width of the impedance adjusting portion 21 in the L direction to optimize performance. The first ground conductor 12 is attached to one side of the substrate 23. In this embodiment, the width of the impedance adjusting portion 21 perpendicular to the signal transmission direction is greater than the width of the transmission portion, so as to reduce the influence of the grid area 11 on the impedance of the transmission line.

Preferably, the transmission line further includes a second ground conductor 13. The second ground conductor 13 is arranged on a side of the signal layer away from the first ground conductor 12.

Specifically, the second ground conductor 13 is a reference ground composed of a single continuous area 10. The first ground conductor 12 and the second ground conductor 13 are arranged opposite to each other, the signal layer is sandwiched between the first ground conductor 12 and the second ground conductor 13, and the second ground conductor 13 opposite to the impedance matching part 21 serves as the part of the transmission line The reference ground constitutes a single-sided reference ground structure.

Referring to FIG. 2, the present invention discloses a transmission line of a second embodiment. The difference from the transmission line of the first embodiment is that the transmission line includes two first ground conductors 12, and the two first ground conductors 12 Relatively arranged, the signal line 2 is arranged between the two first ground conductors 12. The grid regions 11 of the two first ground conductors 12 are aligned and arranged oppositely, and the impedance adjusting portion 21 is sandwiched between the two grid regions 11. Specifically, in this embodiment, the transmission line has a double-sided reference ground structure, and the line width is adjusted by the impedance adjustment section 21 to adjust the impedance of the transmission line, and also provides one more transmission line type for the terminal device.

Preferably, the grid area 11 includes a plurality of wires, and the plurality of wires are intersected to form a grid structure.

Specifically, please refer to Figures 3 to 4. The grid area 11 is the bending area of the transmission line in the terminal equipment. To reduce the break of the transmission line caused by bending, the grid area 11 is arranged by a number of wires crossing to form multiple grids. The structure reduces the pulling force on the grid area 11 when the transmission line is bent, and reduces the risk of fracture. The grid of the grid area 11 may be a prismatic, rectangular, triangular, or hexagonal mesh with elasticity, which is not limited by the present invention.

Preferably, the plurality of wires includes a plurality of first wires 1211 and a plurality of second wires 1212, and the plurality of first wires 1211 and a plurality of second wires 1212 are arranged crosswise to form a mesh structure. The straight line L1 is arranged in parallel, and the second wire 1212 is arranged in parallel along the second straight line L2.

In this embodiment, a plurality of first wires 1211 extending along a first straight line L1 and a plurality of second wires 1212 extending along a second straight line L2 are intersected, and the angle between the first straight line L1 and the second straight line L2 is 90. degree. The bending area 12 of the transmission line is arranged at the bending part of the internal space of the terminal device. Through the flexibility of the mesh, the risk of fracture in the bending area 12 is reduced, and the performance of the transmission line is intact. The first straight line L1 is perpendicular to the second straight line L2, which is more convenient for production in the process of mass industrial production.

As shown in Fig. 5, comparing the curve S1 of the reflection coefficient of the terminal equipment before using the transmission line of the present invention and the curve S2 of the reflection coefficient of the terminal equipment after using the transmission line of the present invention, it can be seen that the use of the transmission line of the present invention can effectively reduce the transmission process. Return loss to improve the radio frequency performance of terminal equipment.

As shown in FIG. 6, comparing the S3 of the transmission coefficient curve before using the transmission line of the present invention and the curve S4 of the transmission coefficient after using the transmission line of the present invention for the terminal equipment, it can be seen that the insertion loss performance after using the transmission line of the present invention is better. .

As shown in Figure 7, comparing the impedance curve S5 before the reference ground structure 3 and the impedance curve S6 after adding the reference ground structure 3 to the grid area 11 used by the terminal equipment, it can be seen that the grid area 11 after the reference ground structure 3 is added is used. The impedance is significantly improved.

In the above embodiment, the transmission line impedance is adjusted by adjusting the line width of the impedance adjusting part, which effectively guarantees the transmission performance of the transmission line. At the same time, the grid area of the transmission line makes the transmission line more flexible, reducing the risk of bending and breaking the transmission line.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A transmission line, characterized in that the transmission line includes a first ground conductor and a signal layer; the first ground conductor is provided with at least two connection areas and at least one grid area sandwiched between the connection areas The signal layer is provided with a signal transmission line, the signal transmission line includes at least two transmission parts and at least one impedance adjustment part sandwiched between the transmission parts; the orthographic projection of the impedance adjustment part is located in the net The grid area; the impedance adjusting part is used to adjust the impedance of the transmission line.
The transmission line according to claim 1, wherein the line width of the impedance adjusting part perpendicular to the signal transmission direction is larger than the line width of the transmission part.
The transmission line according to claim 1 or 2, wherein the transmission line further comprises a second ground conductor, and the second ground conductor is arranged on a side of the signal layer away from the first ground conductor.
The transmission line according to claim 1 or 2, wherein the transmission line comprises two first ground conductors, the two first ground conductors are arranged opposite to each other, and the signal layer is arranged on the two first ground conductors. Between conductors.
The transmission line according to claim 4, wherein the grid areas of the two first ground conductors are arranged opposite to each other, and the impedance adjusting portion of the signal line is sandwiched between the two grid areas between.
The transmission line according to claim 2, wherein the grid area includes a plurality of wires, and the plurality of wires are arranged in a cross to form a grid structure.
The transmission line according to claim 6, wherein the plurality of wires comprises a plurality of first wires and a plurality of second wires, and the plurality of first wires and a plurality of second wires are arranged crosswise, and the first wires are arranged along the first wires. The straight lines are arranged in parallel, and the second wire is arranged in parallel along the second straight line.
The transmission line according to claim 7, wherein the first straight line is perpendicular to the second straight line.
A terminal device, characterized in that the terminal device comprises the transmission line according to any one of claims 1-8.