CN101877916A - Multi-mode Mobile Terminal and Its Antenna Matching Implementation Method - Google Patents

Abstract

The invention discloses a multi-mode mobile terminal and a realizing method of antenna matching thereof, wherein the realizing method comprises the steps of: respectively arranging a plurality of groups of antenna matching circuits on the multi-mode mobile terminal according to network forms supported by the multi-mode mobile terminal; and controlling the antenna matching circuit corresponding to the network form of a radio frequency link in the plurality of groups of antenna matching circuits to be in a working state according to the network form of the radio frequency link when the radio frequency link of the multi-mode mobile terminal works. By the invention, the multi-mode mobile terminal can automatically select the required matching circuit, thereby improving the property of the multi-mode mobile terminal.

Description

Multi-mode Mobile Terminal and Its Antenna Matching Implementation Method

technical field

The invention relates to the communication field, in particular to a multi-mode mobile terminal and a method for realizing antenna matching thereof.

Background technique

With the rapid development of wireless communication technology, terminals have more and more functions. With the gradual evolution of 3G and upcoming 4G technologies, the frequency bands that terminal antennas can support are becoming more and more abundant. However, in the current terminal antenna matching system, it is often encountered that the antenna has only one matching network, which brings a lot of trouble to the multi-band antenna debugging to a certain extent. Especially when encountering Electro Magnetic Compatibility (EMC for short) problems, this problem is particularly prominent.

The transmission link of the traditional radio frequency system is shown in Figure 1. It can be clearly seen in the figure that after the signals of different formats are sent from the baseband chip, they are processed by the GSM chip and the TDSCDMA chip for debugging and up-conversion. The respective power amplifiers (Power Amplifier, referred to as PA) amplify the signal, and the amplified signal is switched by the multi-mode switch, and finally passes through the matching circuit and is emitted by the antenna.

The schematic diagram of the terminal transmission system shown in Figure 1 is a dual-mode terminal with single-mode operation, so after the multi-mode switch is switched, only signals of one system can be transmitted each time. Due to the large frequency difference of various standards, for example, the frequency difference between GSM900 (frequency about 900MHz) and 3G TDSCDMA standard (frequency about 2GHz) is more than 1G, and the π-type matching circuit or T-type matching circuit we commonly use in matching circuits It is difficult to match such a wide frequency band, which makes it difficult for the terminal to be fully compatible with TD and GSM when performing EMC tests or OTA (Over The Air, OTA) tests, which means The energy cannot be transmitted in the best state, and part of the energy will be reflected back, which will cause problems such as low efficiency of the antenna during OTA testing. In addition, if we encounter the second or third harmonic when testing EMC, it is also difficult to use matching circuits to suppress harmonic interference. Resulting in excessive EMC.

To sum up, it can be seen that there is a problem in the prior art that the existing single matching circuit cannot meet the requirements of the multi-band matching circuit, resulting in the degradation of terminal performance. Therefore, it is necessary to propose an improved technical means to solve this problem.

Contents of the invention

In view of the problem that the existing single matching circuit in the prior art cannot meet the requirements of the multi-band matching circuit, which leads to the degradation of terminal performance, the present invention is made. Therefore, the main purpose of the present invention is to provide a multi-mode mobile terminal and its antenna Matching implementation methods, where:

The method for realizing antenna matching of a multi-mode mobile terminal according to an embodiment of the present invention includes: respectively setting multiple groups of antenna matching circuits on the multi-mode mobile terminal according to the supported network standards; when the radio frequency link of the multi-mode mobile terminal is working, The network standard of the link controls the corresponding antenna matching circuits among the multiple groups of antenna matching circuits to be in the working state.

Preferably, the multiple groups of antenna matching circuits are connected through diodes.

Preferably, the multi-mode mobile terminal controls the corresponding antenna matching circuits in the multi-group antenna matching circuits to be in the working state, further comprising: the baseband chip of the multi-mode mobile terminal controls the corresponding antenna matching circuits in the multi-group antenna matching circuits to be working status.

Preferably, the multi-mode mobile terminal controls the corresponding antenna matching circuits in the multi-group antenna matching circuits to be in the working state, further comprising: the baseband chip of the multi-mode mobile terminal controls the multi-mode switch of the multi-mode mobile terminal to select the corresponding radio frequency link; The chip controls the corresponding antenna matching circuits in multiple sets of antenna matching circuits to work by controlling the diodes.

The multi-mode mobile terminal according to the embodiment of the present invention includes: multiple groups of antenna matching circuits, wherein each group of antenna matching circuits corresponds to the network standard supported by the multi-mode mobile terminal; According to the network standard of the road, the corresponding antenna matching circuits in the multiple groups of antenna matching circuits are controlled to be in the working state.

Preferably, each group of antenna matching circuits is connected through a diode.

Preferably, the control module controls the corresponding antenna matching circuits in the multiple groups of antenna matching circuits to be in the working state by controlling the diodes.

Preferably, the control module further includes: a first control module, used to control the multi-mode switch of the multi-mode mobile terminal to select a corresponding radio frequency link; The antenna matching circuit is working.

Compared with the prior art, according to the technical solution of the present invention, by setting multiple groups of antenna matching circuits, the antenna matching circuits can automatically select the required matching circuits according to the operating standard of the terminal, thereby improving the performance of the multi-mode mobile terminal.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of antenna matching in the prior art;

Fig. 2 is the flow chart of the implementation method of multi-mode mobile terminal antenna matching according to the present invention;

Fig. 3 is a schematic diagram according to Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram according to Embodiment 2 of the present invention;

FIG. 5 is a flow chart of an optimal processing scheme of a method for implementing multi-mode mobile terminal antenna matching according to the present invention;

Fig. 6 is a structural block diagram of a multi-mode mobile terminal according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

According to an embodiment of the present invention, a method for realizing antenna matching of a multi-mode mobile terminal is provided.

Fig. 2 is the flow chart of the implementation method of multimode mobile terminal antenna matching according to the present invention, as shown in Fig. 2, this flow process comprises (step 202-204):

In step 202, multiple sets of antenna matching circuits are respectively set on the multi-mode mobile terminal according to the supported network standards.

Integrate π-type or T-type matching networks containing multiple sets of matching circuits on the multi-mode mobile terminal. These matching networks correspond to matching of various frequency bands, such as: matching circuits for GSM850/900, GSM1800/1900 and TDSCDMA frequency bands. These different matching circuits are connected through diodes. These diodes are equivalent to the function of microwave switches. When these diodes are set to high voltage through the GPIO pins of the baseband chip, the diodes are turned on. When these diodes are When set to a low voltage, the diode turns off.

Step 204, when the radio frequency link of the multi-mode mobile terminal is working, control the corresponding antenna matching circuits among the multiple sets of antenna matching circuits to be in the working state according to the network standard of the radio frequency link.

Correspond the matching circuit of each frequency band with the logic control of the multi-mode switch. The specific processing method includes, when the logic control of the multimode switch is GSM850/900, just the first diode is in the off state, and the other two diodes are in the on state, so that only the matching network of GSM850/900 works , the rest of the matching networks are in the idle state, and the other two standards are similar to the above-mentioned state for matching control of logic control.

Embodiments of the present invention are described below in conjunction with FIG. 3 and FIG. 4 .

Fig. 3 is a schematic diagram according to Embodiment 1 of the present invention. Referring to Fig. 3, multiple sets of matching circuits are added to the multi-mode mobile terminal. For example, these sets of matching circuits correspond to π-type matching or T-type matching circuits corresponding to GSM850/900, GSM1800/1900 and TDSCDMA. Each group of matching circuits is connected through diodes. These diodes are equivalent to a microwave switch. When the voltage is high, the diodes conduct, and when the voltage is low, the diodes do not conduct. In this way, after matching the conduction logic of the diode and the logic control of the switch, the change of antenna matching can be automatically adjusted through the logic control of the switch, so as to meet the requirement of self-adaptation of the matching circuit.

Table 1

Table 1 is the logic control table of the multi-mode switch transmission path in Figure 3, as shown in Table 1, where H represents high level, and L represents low level. It can be seen from Table 1 that when the radio frequency of the radio frequency link When the working state is GSM850/900, the voltages given by the GPIO1-4 pins on the baseband chip are H, H, L, and L respectively. At this time, the GSM850/900 of the multi-mode switch is turned on, so that the link works at Status of GSM850/900. Connect diodes 1, 2, 3 to GPIO4, 2, 1 respectively. It can be seen that when the radio frequency link works in GSM850/900, the voltages of the three pins of GPIO4, 2, 1 are L, H respectively. , H, that is, the levels of the three diodes are L, H, and H respectively, that is to say, the first diode is not conducting, and the second and third diodes are conducting. At this time, it is equivalent to the matching circuit of GSM850/900 works, while the remaining two matching circuits do not. Similarly, the working modes of the other two frequency bands can also be obtained.

For the receiving channel, the same design is also carried out. It can be seen from Table 1 that according to the above logic control, when the receiving channels work in different formats, the four GPIO pins respectively control the respective receiving channels. Control, and the switching logic of the receiving path and the switching logic of the transmitting path are not the same, that is to say, the receiving and transmitting are independent of each other.

Fig. 4 is a schematic diagram according to Embodiment 2 of the present invention. It should be noted that if the logic control of the multimode switch and the logic control of the matching circuit cannot be matched, there are other connection options. The logic control of the matching circuit can also be performed through other GPIO pins on the baseband chip. Control, as shown in Figure 4, the GPIO1-4 pins on the baseband chip are connected to the multimode switch for controlling the multimode switch; the GPIO5-7 pins on the baseband chip are connected to diodes 1, 2, and 3 respectively, As long as the logic sequence is equivalent to that of the multimode switch, the matching circuit and the switch can be matched one by one through software control, so as to achieve the purpose of self-adaptive matching.

The specific implementation flow chart is shown in Figure 5. Referring to Figure 5, the baseband chip provides the corresponding logic control first, and then controls the multi-mode switch through the GPIO pins of the baseband chip to make it work in the corresponding mode. While controlling the multi-mode switch, another part of the control circuit controls the conduction of the diode, and selects the corresponding matching circuit according to the conduction of the diode. At this time, if the corresponding matching circuit and the multi-mode switch have the same working system If , the signal is output in the best state, thus completing the adaptive work of the matching circuit in this mode.

To sum up, the present invention can enable the matching circuit of the antenna to automatically select the required matching circuit according to the different operating standards of the terminal, so that not only the performance of the terminal can be operated in the best state, but also the maximum efficiency can be achieved. To maximize the performance of the antenna, to a certain extent, reduce the OTA test burden of the antenna, and provide convenience for the EMC test of the whole machine.

Device embodiment

According to an embodiment of the present invention, a multi-mode mobile terminal is also provided.

FIG. 6 is a structural block diagram of a multi-mode mobile terminal according to an embodiment of the present invention. As shown in FIG. 6 , the device includes: multiple sets of antenna matching circuits 10 and a control module 20 .

Multiple groups of antenna matching circuits 10, wherein each group of antenna matching circuits corresponds to the network standards supported by the multi-mode mobile terminal, wherein each group of antenna matching circuits is connected through diodes.

The control module 20 is configured to control the corresponding antenna matching circuits among the multiple sets of antenna matching circuits 10 to be in the working state according to the network standard of the radio frequency link that the multi-mode mobile terminal is currently working on. The control module 20 controls the corresponding antenna matching circuits in the plurality of groups of antenna matching circuits to work by controlling the diodes.

In a specific implementation, the control module may further include: a first control module (not shown in the figure), used to control the multimode switch of the multimode mobile terminal to select a corresponding radio frequency link; a second control module (not shown in the figure) , used to control the corresponding antenna matching circuits in multiple sets of antenna matching circuits to work by controlling the diodes. The first control module and the second control module can be arranged separately or integrated, which is not limited here.

In summary, according to the above technical solution of the present invention, by setting multiple sets of antenna matching circuits, the antenna matching circuits can automatically select the required matching circuits according to the operating standard of the terminal, thereby improving the performance of the multi-mode mobile terminal; and can Maximizing the performance of the antenna reduces the OTA test burden of the antenna to a certain extent, and facilitates the EMC test of the whole machine.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (8)

1. the implementation method of a multi-module mobile terminal antenna match is characterized in that, comprising:

Network formats according to its support on multi-module mobile terminal is provided with many group antenna-matching circuits respectively;

When the radio frequency link of described multi-module mobile terminal was worked, according to the network formats of described radio frequency link, the antenna-matching circuit of controlling correspondence in described many group antenna-matching circuits was an operating state.

2. method according to claim 1 is characterized in that, connects by diode between described many group antenna-matching circuits.

3. method according to claim 2 is characterized in that, corresponding antenna-matching circuit is an operating state in the described many group antenna-matching circuits of described multi-module mobile terminal control, further comprises:

The baseband chip of described multi-module mobile terminal is by the described diode of control, and the antenna-matching circuit of controlling correspondence in described many group antenna-matching circuits is an operating state.

4. method according to claim 2 is characterized in that, corresponding antenna-matching circuit is an operating state in the described many group antenna-matching circuits of described multi-module mobile terminal control, further comprises:

The baseband chip of described multi-module mobile terminal is controlled the multimode switch of described multi-module mobile terminal and is selected corresponding radio frequency link;

Described baseband chip is by the described diode of control, and the antenna-matching circuit of controlling correspondence in described many group antenna-matching circuits is an operating state.

5. a multi-module mobile terminal is characterized in that, comprising:

Many group antenna-matching circuits, wherein every group of network formats that the corresponding respectively described multi-module mobile terminal of antenna-matching circuit is supported;

Control module is used for the network formats according to the radio frequency link of described multi-module mobile terminal work at present, and the antenna-matching circuit of controlling correspondence in described many group antenna-matching circuits is an operating state.

6. multi-module mobile terminal according to claim 5 is characterized in that, connects by diode between described every group of antenna-matching circuit.

7. multi-module mobile terminal according to claim 6 is characterized in that, described control module is by the described diode of control, and the antenna-matching circuit of controlling correspondence in described many group antenna-matching circuits is an operating state.

8. multi-module mobile terminal according to claim 6 is characterized in that, described control module further comprises:

First control module, the multimode switch that is used to control described multi-module mobile terminal is selected corresponding radio frequency link;

Second control module, being used for by controlling the corresponding antenna-matching circuit of the described many group antenna-matching circuits of described diode control is operating state.

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