CN2629355Y - Printed circuit board structure of wireless transmission device - Google Patents

Abstract

The utility model discloses a be applied to wireless transmission device's printed circuit board structure for improve product yield and productivity, it contains a radio frequency module and a second printed circuit board. The radio frequency module comprises a first printed circuit board and a radio frequency element arranged on the first printed circuit board. The area of the second printed circuit board is larger than that of the first printed circuit board, and the first printed circuit board is arranged on the surface of the second printed circuit board.

Description

Printed circuit board structure of wireless transmission device

technical field

The utility model relates to a printed circuit board structure of a wireless transmission device, in particular to a printed circuit board structure of a wireless transmission device comprising several printed circuit boards.

Background technique

With the continuous innovation and development of wireless communication technology, mobile phones have become one of the indispensable communication tools for modern people, and wireless local area networks (wireless LAN, WLAN) are gradually replacing wired local area networks. At present, many companies have used wireless methods to transmit digital data, thus replacing the original office environment where the same functions can only be completed by wiring everywhere. Not only that, many public buildings are also building wireless local area networks one after another. For example, many international airports, hotels, and coffee chain stores provide similar services to consumers in need. Users only need to use a personal computer or PDA with a wireless network card installed to connect to the nearest access point. Whether sending and receiving e-mail, surfing the Internet, or online games, the acquisition and use of network resources can achieve zero time difference and zero distance.

In addition to the access point, the wireless transmission device used in the wireless local area network also includes a gateway, a router, and the like. Most of the printed circuit boards used in the above-mentioned wireless transmission devices use the so-called surface mount technology (Surface Mounting Technology, SMT) to integrate various circuit components, such as base band (base band), media access control (Media Access Control, MAC ) and radio frequency (Radio Frequency, RF) components are fixed on the printed circuit board. Generally speaking, RF components handle high-frequency signal transmission and reception, and their requirements for circuit design and component matching are quite strict. Therefore, how to ensure that the radio frequency components can function stably and without error has become a very important issue in the wireless signal transmission technology.

In order to seek good signal transmission quality and better stability, U-NII (47CFR15.401) of the newly formulated wireless network communication protocol 802.11a proposes a frequency band around 5 GHz for use. In addition, the wireless network communication protocol 802.11b/g ISM (47CFR15.247) stipulates that the 2.400-2.4835GHz frequency band is used for transmission power below 1000mW.

Generally speaking, the frequency bands of different communication protocols must use different radio frequency components, and when different radio frequency components are fixed on the printed circuit board, whether the effect of the radio frequency component and the electronic components such as resistors and capacitors on the printed circuit board can be produced The expected effect is often a major problem in quality control. Once the overall test quality of the radio frequency component and its associated electronic components is poor, the entire printed circuit board must still be replaced if necessary, thereby greatly increasing the overall manufacturing cost. Therefore, how to reduce the manufacturing cost of printed circuit board mismatch caused by the replacement of radio frequency components has become an important issue in the industry today.

Contents of the invention

The main purpose of the utility model is to provide a printed circuit board structure applied to a wireless transmission device, so as to improve the yield rate of the printed circuit board of the wireless transmission device, and further reduce production costs.

The printed circuit board structure used in the wireless transmission device of the utility model includes a radio frequency module and a second printed circuit board. The radio frequency module can provide the function of transmitting and receiving wireless signals, and it includes a first printed circuit board and a radio frequency component installed on the first printed circuit board. The area of the second printed circuit board is not smaller than that of the first printed circuit board, and the first printed circuit board is installed on the surface of the second printed circuit board.

The main technical feature of the utility model is to divide the original printed circuit board including all circuit elements into two printed circuit boards, one large and one small, and first combine the radio frequency components on the smaller printed circuit board, and the smaller printed circuit board Electronic components related to the radio frequency component are arranged on the printed circuit board, thereby forming a radio frequency module. The radio frequency module can be tested before being combined into a larger printed circuit board to ensure that the radio frequency module is a good product. In this way, if the radio frequency module is a defective product, only the smaller printed circuit board needs to be replaced, and the circuit design of the larger printed circuit board does not need to consider the type of radio frequency components.

The technology of the utility model can also use two circuit boards of the same size, as long as the method of forming a radio frequency module is also applied, the same effect can be achieved.

Description of drawings

The utility model will be described according to the accompanying drawings, wherein:

Fig. 1 is an exploded view of the printed circuit board of the wireless transmission device of the present invention;

FIG. 2 is an assembly diagram of the printed circuit board of the wireless transmission device of the present invention.

Explanation of symbols in the figure:

10 RF module

11 RF components

12 The first printed circuit board

13 pins

20 Printed circuit board structure of wireless transmission device

21 Second printed circuit board

22 baseband components

23 MAC components

24 pads

Detailed ways

Radio frequency signal plays a very important part in wireless signal transmission, its quality is related to the effect and quality of wireless signal transmission. The following will take the radio frequency element as an example to illustrate the technical characteristics of the present utility model:

Referring to FIG. 1 , a radio frequency component 11 is mounted on a surface of a first printed circuit board 12 to form a radio frequency module 10 . The surface of the first printed circuit board 12 may include various electronic components such as resistors, capacitors and inductors, which are used to cooperate with the radio frequency component 11 to provide the function of transmitting and receiving radio frequency signals.

Generally speaking, the quality and stability of the radio frequency module 10 are difficult to control, so the radio frequency module 10 can be tested first to confirm that there are no problems with the intensity and field pattern of the radio wave emitted, and then proceed to the next step .

After ensuring that the radio frequency module 10 is a good product, the pins 13 of the first printed circuit board 12 and the pads (pad) 24 on the surface of a second printed circuit board 21 are combined with solder paste to form as shown in Figure 2 A printed circuit board structure 20 of a wireless transmission device comprising two printed circuit boards. In other words, the printed circuit board structure 20 of the wireless transmission device includes the first printed circuit board 12 and the second printed circuit board 21, wherein the first printed circuit board 12 is equipped with the radio frequency element 11, and the second printed circuit board 21 includes a baseband component 22 and a MAC component 23 commonly used in wireless signal transmission, and the area of the second printed circuit board 21 is larger than that of the first printed circuit board 12 .

The printed circuit board structure 20 of the wireless transmission device of the present utility model can not only avoid the loss caused by the scrapping of the whole printed circuit board, but the radio frequency element 11 can be produced according to the different application frequency bands and communication protocols, respectively, according to 802.11a, 802.11a, RF modules of various communication protocols such as 802.11b, 802.11d, 802.11e, 802.11f, 802.11g, 802.11i or Bluetooth. In this way, the second printed circuit board 21 can be standardized, and only need to install different types of radio frequency modules 10 according to different requirements, so it is very suitable for mass production. In addition, because it isolates the radio frequency components 11 that are prone to problems, not only the production yield can be improved, but also the production capacity can be greatly increased.

The radio frequency module 10 and the second printed circuit board 21 can be combined using common connecting fingers, sockets or stamp holes in addition to solder paste, which is more convenient for the radio frequency module. 10 replacements. However, this may increase manufacturing costs, so all relevant factors must be considered together.

The utility model can also manufacture structures comprising more than three printed circuit boards according to different needs, for example, two smaller printed circuit boards are formed into modules with independent functions, and then installed on a larger printed circuit board, or formed A structure consisting of three stacked printed circuit boards. In addition, the first printed circuit board 12 is not limited to use the radio frequency component 11 , and other components with different functions can also be used. As long as the concept of a modular combination is used to improve the yield rate and production capacity of the product, thereby reducing the cost, all should be covered by the present invention.

The printed circuit board structure 20 of the wireless transmission device can not only be applied to wireless signal transmission products such as routers, access devices, gateways or mobile phones, but also information appliances (Information Application, IA) such as wireless refrigerators, ovens or security systems in the future. ) products can also be applied to increase the convenience of life.

The technical content and technical features of the present utility model have been disclosed above, but those who are familiar with the technology may still make various replacements and modifications based on the teaching and disclosure of the present utility model without departing from the spirit of the present utility model. Therefore, the protection scope of the present utility model should not be limited to the content disclosed in the embodiments, but also include various replacements and modifications that do not deviate from the present utility model, and are covered by the protection scope of this patent application.

Claims (9)

1. the printed circuit board arrangement of a radio transmitting device comprises:

One radio-frequency module, it comprises: one first printed circuit board (PCB) is provided with the circuit element relevant with receiving and dispatching radiofrequency signal; And a radio-frequency (RF) component, be installed on described first printed circuit board (PCB);

One second printed circuit board (PCB), its area are not less than described first printed circuit board (PCB), and this first printed circuit board (PCB) is the surface that is installed in described second printed circuit board (PCB);

It is characterized in that the circuit design of described second printed circuit board (PCB) and the model of described radio-frequency (RF) component have nothing to do, described radio-frequency module test in advance just is installed in the surface of this second printed circuit board (PCB) to filter bad radio-frequency (RF) component after to be detected the finishing.

2. the printed circuit board arrangement of radio transmitting device according to claim 1, the circuit element that it is characterized in that described first printed circuit board (PCB) is resistance, electric capacity or inductance.

3. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described second printed circuit board (PCB) comprises a baseband element in addition.

4. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described second printed circuit board (PCB) comprises a media interviews control element in addition.

5. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described first printed circuit board (PCB) and second printed circuit board (PCB) are to carry out combination with tin cream.

6. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described second printed circuit board surface comprises a slot in addition, in order in conjunction with described first printed circuit board (PCB).

7. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described second printed circuit board surface comprises a golden finger in addition, in order in conjunction with this first printed circuit board (PCB).

8. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that it is to be applied in access device, gateway and the router.

9. the printed circuit board arrangement of radio transmitting device according to claim 1 is characterized in that described radio-frequency module is a kind of among employing wireless network communication protocol 802.11a, 802.11b, 802.11d, 802.11e, 802.11f, 802.11g, 802.11i and the Bluetooth.

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