WO2014183489A1

WO2014183489A1 - Printed circuit board and terminal

Info

Publication number: WO2014183489A1
Application number: PCT/CN2014/071781
Authority: WO
Inventors: 张翠兰
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-05-16
Filing date: 2014-01-29
Publication date: 2014-11-20
Also published as: CN203340416U

Abstract

Provided are a printed circuit board and a terminal. A first bonding pad of a first device and a second bonding pad of a second device are arranged on the printed circuit board, and a radio-frequency coaxial line is also arranged on the printed circuit board. The first end of the radio-frequency coaxial line is electrically connected to the first bonding pad, and the second end of the first bonding pad is electrically connected to the second bonding pad.

Description

Printed circuit board and terminal

The present invention relates to the field of circuit board design, and more particularly to a printed circuit board and a terminal. Background technique

With the rapid development of modern wireless communication technology, smart terminals, especially smart phones, have more and more functions. However, due to the requirements of user experience and modeling, more and higher requirements are placed on the design of circuit boards. It also brings more challenges.

In the current circuit board design, more and more layers are stacked, and the thickness is getting thinner. Together with the continuous increase of the operating frequency and signal transmission rate of the terminal, the existing high-speed printed circuit board manufacturing process is produced. The circuit board has a problem that the impedance control is intensified and the attenuation is large due to the increase in the attenuation per unit length in the high-frequency impedance control. In particular, some common transmission lines for radio frequency signals need to transmit radio frequency signals from several hundred megahertz to several gigahertz. With such a wide frequency range, it is difficult to achieve full-band impedance matching by matching debugging. Some RF signal transmission lines often need to span almost the entire circuit board, and the difficulty of impedance control can be imagined.

At the same time, with the miniaturization and arraying of electronic component packages, the density of circuit boards is constantly increasing. Important traces like RF signal transmission lines, in addition to impedance control requirements, also need to consider electromagnetic compatibility issues. Lines often require complete and uniform ground tracking. Long RF signal transmission lines are difficult to get better protection and do not meet the ideal design requirements.

Taking the 10-layer single board shown in Figure 1 as an example, in the case where the device 1 to the device 2 are 4 距离 away, the general transmission line 8 selects the structure of the inner strip line shown in Fig. 1 to realize the radio frequency signal. Connection. In order to get as close as possible to the impedance control target, in addition to the strip layer where the upper and lower layers require two GND planes (layer 4 and layer 7 are defined as the main board of the board, layer 4 corresponds to GND 01, layer 7 corresponds to GND 02), and often It will hollow out 1~2 layers in its adjacent layer, as shown in Figure 6 A portion of the metal layer corresponding to line 1 has been hollowed out. Summary of the invention

In order to solve the problems in the prior art, embodiments of the present invention provide a printed circuit board and a terminal.

Embodiments of the present invention provide a printed circuit board, wherein the printed circuit board is provided with a first pad of a first device and a second pad of a second device, and the printed circuit is further provided with a radio frequency The first end of the radio frequency coaxial line is electrically connected to the first pad, and the second end of the radio frequency coaxial line is electrically connected to the second pad.

In an embodiment, the printed circuit board is further provided with a first RF coaxial connector, a first microstrip line, a second RF coaxial connector, and a second microstrip line;

The first end of the radio frequency coaxial line is electrically connected to the first pad through a first RF coaxial connector and a first microstrip line connected to the first RF coaxial connector;

A second end of the RF coaxial cable is electrically coupled to the second pad via a second RF coaxial connector and a second microstrip line coupled to the second RF coaxial connector.

In one embodiment, the first end of the radio frequency coaxial cable is electrically connected to the first micro-wire coaxial connector and the first micro-belt line connected to the first radio frequency coaxial connector The connection is specifically as follows:

The first end of the radio frequency coaxial cable is electrically connected to the first end of the first radio frequency coaxial connector; the second end of the first radio frequency coaxial connector and the first micro strip line One end is electrically connected; the second end of the first microstrip line is electrically connected to the first pad;

The second end of the radio frequency coaxial cable is electrically connected to the second pad through a second RF coaxial connector and a second microstrip line connected to the second RF coaxial connector.

The second end of the radio frequency coaxial cable is electrically connected to the first end of the second radio frequency coaxial connector; the second end of the second radio frequency coaxial connector and the second microstrip line One end is electrically connected; the second end of the second microstrip line is electrically connected to the second pad. In an embodiment, the first microstrip line and the second microstrip line are disposed on a surface layer of the printed circuit board.

In an embodiment, at least one fixing device for fixing the radio frequency coaxial axis is fixed on the printed circuit board.

In an embodiment, the fixing device is made of a metal material.

In one embodiment, the printed circuit board has at least one via, and the ground signal line of the printed circuit board is electrically connected to the fixing device through the via.

In an embodiment, the contact area of the radio frequency coaxial line with the fixing device is a region where the outer insulating sheath is peeled off.

In one embodiment, the surface of the contact area of the radio frequency coaxial line with the fixture is provided with a metal sleeve.

The embodiment of the invention further provides a terminal, comprising the above printed circuit board.

The beneficial effects of the above technical solutions of the embodiments of the present invention are as follows:

In the embodiment of the invention, a radio frequency coaxial line is used to replace some RF transmission lines on the printed circuit board that need to control the impedance, which solves the problem that the high-frequency impedance control of the RF signal transmission line of the high-speed printed circuit board is difficult. DRAWINGS

Figure 1 is a schematic diagram of a conventional RF signal connection;

2 is a schematic cross-sectional view showing a printed circuit board according to an embodiment of the present invention;

3 is a schematic diagram 1 of a radio frequency coaxial line used in an embodiment of the present invention;

4 is a second schematic diagram of a radio frequency coaxial line used in an embodiment of the present invention. detailed description

In order to make the technical problems, the technical solutions and the advantages of the present invention more clearly, the following detailed description will be made with reference to the accompanying drawings and specific embodiments. FIG. 1 is a schematic cross-sectional view of a printed circuit board according to an embodiment of the present invention. The printed circuit board is provided with a first pad 11 of the first device 1 and a second pad 21 of the second device 2, and the printed circuit is further provided with a radio frequency coaxial line 001, the radio frequency coaxial The first end of the line 001 is electrically connected to the first pad 11, and the second end of the radio frequency coaxial line 001 is electrically connected to the second pad 21.

The first end of the radio frequency coaxial line 001 is electrically connected to the first pad 11 through a first radio frequency coaxial connector 002 and a first microstrip line 007 connected to the first radio frequency coaxial connector 002. Specifically, the first end of the radio frequency coaxial line 001 is electrically connected to the first end of the first radio frequency coaxial connector 002; the second end of the first radio frequency coaxial connector 002 is The first end of the first microstrip line 007 is electrically connected; the second end of the first microstrip line 007 is electrically connected to the first pad 11;

The second end of the RF coaxial cable 001 is electrically connected to the second pad 21 through a second RF coaxial connector 003 and a second microstrip line 008 connected to the second RF coaxial connector 003. . Specifically, the second end of the radio frequency coaxial cable 001 is electrically connected to the first end of the second radio frequency coaxial connector 003; the second end of the second radio frequency coaxial connector 003 is opposite to the first The first end of the second microstrip line 008 is electrically connected; the second end of the second microstrip line 008 is electrically connected to the second pad 21.

The first microstrip line 007 and the second microstrip line 008 are disposed on a surface layer of the printed circuit board.

Optionally, at least one fixing device 004 for fixing the RF coaxial cable 001 is fixed on the printed circuit board, and the fixing device 004 may be made of a metal material, such as a metal clip.

The printed circuit board has at least one via, and a ground signal line of the printed circuit board is electrically connected to the fixing device 004 through the via.

Taking the fixing device 004 as a metal clip as an example, it can function as a fixing and a grounding. The metal clip is, for example, a metal snap. In order to better fix the RF coaxial cable 001 and increase its anti-jamming capability, the RF coaxial cable 001 is fixed and reliable with several soldering to the single board such as a metal buckle. Ground. The metal buckle can be connected to the main ground of the board through punching to ensure the reliability of the grounding.

As shown in Fig. 3, the contact area 31 of the radio frequency coaxial line with the metal clip is the area where the outer insulating sheath is peeled off. Optionally, as shown in FIG. 4, a surface of the contact area 31 of the radio frequency coaxial line with the metal clip is provided with a metal sleeve 32. In the invention, the part of the connection between the metal buckle and the radio frequency coaxial line, the outermost insulating sheath portion of the radio frequency coaxial line is peeled off or stripped, and a metal sleeve is added to ensure the outer conductor of the metal buckle and the coaxial line. (shield) Reliable connection.

The embodiment of the invention further provides a connection mode of the radio frequency signal, which can be used for connecting the radio frequency signal on the high speed printed circuit board of the intelligent terminal, and replacing the radio frequency coaxial line with some control impedance required on the printed circuit board. The RF transmission line helps solve the problem of high-frequency impedance control of the RF signal transmission line on the high-speed printed circuit board under high-speed communication conditions and the electromagnetic compatibility design is not satisfied. The invention not only effectively solves the problem that the high-frequency impedance control of some high-speed printed circuits is difficult, but also provides a new solution for the problem that the RF impedance line cannot go out and is easily interfered under certain conditions.

According to the present invention, the transmission line 8 of the strip-shaped wiring in Fig. 1 is replaced by the radio frequency coaxial line 001 having the characteristics of high frequency, reduced attenuation, and good shielding performance as shown in Fig. 2. At the same time, two RF coaxial connectors 002, 003 are required to connect to the motherboard. From device 1 to RF coaxial connector 002, and between device 2 and RF coaxial connector 003, use a short surface microstrip line 007, 008 to connect.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

claims

1. A printed circuit board. The printed circuit board is provided with a first pad of a first device and a second pad of a second device. The printed circuit is also provided with a radio frequency coaxial line, so The first end of the radio frequency coaxial line is electrically connected to the first pad, and the second end of the radio frequency coaxial line is electrically connected to the second pad.

2. The printed circuit board according to claim 1, wherein the printed circuit board is further provided with a first radio frequency coaxial connector, a first microstrip line, a second radio frequency coaxial connector and a second microstrip line;

The first end of the radio frequency coaxial line is electrically connected to the first pad through the first radio frequency coaxial connector and the first microstrip line connected to the first radio frequency coaxial connector; The second end of the radio frequency coaxial line is electrically connected to the second pad through the second radio frequency coaxial connector and the second microstrip line connected to the second radio frequency coaxial connector.

3. The printed circuit board according to claim 2, wherein the first end of the radio frequency coaxial line passes through the first radio frequency coaxial connector and all components connected to the first radio frequency coaxial connector. The electrical connection between the first microstrip line and the first pad is specifically:

The first end of the radio frequency coaxial line is electrically connected to the first end of the first radio frequency coaxial connector; the second end of the first radio frequency coaxial connector is electrically connected to the first end of the first microstrip line. One end is electrically connected; the second end of the first microstrip line is electrically connected to the first pad;

The second end of the radio frequency coaxial line is electrically connected to the second pad through the second radio frequency coaxial connector and the second microstrip line connected to the second radio frequency coaxial connector. for:

The second end of the radio frequency coaxial line is electrically connected to the first end of the second radio frequency coaxial connector; the second end of the second radio frequency coaxial connector is electrically connected to the third end of the second microstrip line. One end is electrically connected; the second end of the second microstrip line is electrically connected to the second pad.

4. The printed circuit board according to claim 2, wherein the first microstrip line and the The second microstrip line is provided on the surface layer of the printed circuit board.

5. The printed circuit board according to claim 1, wherein at least one fixing device for fixing the radio frequency coaxial line is fixed on the printed circuit board.

6. The printed circuit board according to claim 5, wherein the fixing device is made of metal material.

7. The printed circuit board according to claim 6, wherein the printed circuit board has at least one via hole, and the ground signal line of the printed circuit board is electrically connected to the fixing device through the via hole. .

8. The printed circuit board according to any one of claims 5 to 7, wherein the contact area of the radio frequency coaxial line and the fixing device is an area where the outer insulating sheath is peeled off.

9. The printed circuit board according to claim 8, wherein a metal sleeve is provided on the surface of the contact area between the radio frequency coaxial line and the fixing device.

10. A terminal, including the printed circuit board according to any one of claims 1-9.