Mobile terminal and antenna switching method thereof

Abstract

The present application discloses a mobile terminal and an antenna switching method thereof, and relates to the field of communication technology. The mobile terminal includes an external antenna interface for connecting to an external antenna, and the accuracy of the external antenna is higher than that of a built-in antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, the switch circuit can be controlled to connect the external antenna interface with the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is high, the accuracy of positioning of the mobile terminal based on the signal of the external antenna is high.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a mobile terminal and an antenna switching method thereof. Background Art

[0002] Currently, a planar inverted-F antenna is provided in a mobile terminal, and the mobile terminal can determine the current position based on the satellite signal received by the planar inverted-F antenna to meet the user's usual positioning needs.

[0003] However, due to the low accuracy of the planar inverted-F antenna, the positioning accuracy of the mobile terminal is low. Summary of the invention

[0004] The present application provides a mobile terminal and an antenna switching method thereof, which can solve the problem of low positioning accuracy of mobile terminals in related technologies. The technical solution is as follows:

[0005] In one aspect, a mobile terminal is provided, the mobile terminal comprising: a processor, a switch circuit, a positioning circuit, a built-in antenna, and an external antenna interface, the external antenna interface being used to connect an external antenna, the accuracy of the external antenna being higher than the accuracy of the built-in antenna;

[0006] The processor is connected to the switch circuit and the external antenna interface respectively, and the processor is used to send a first switching control signal to the switch circuit if it is detected that the external antenna interface is connected to the external antenna;

[0007] The switch circuit is also connected to the built-in antenna, the external antenna interface and the positioning circuit respectively, and the switch circuit is used to disconnect the built-in antenna from the positioning circuit and connect the external antenna interface to the positioning circuit in response to a first switching control signal sent by the processor;

[0008] The positioning circuit is used to determine the position of the mobile terminal based on the antenna signal received by the built-in antenna or the antenna signal received by the external antenna interface.

[0009] Optionally, the mobile terminal further includes: a first filter and a first amplifier;

[0010] The first filter and the first amplifier are connected in series between the switch circuit and the positioning circuit.

[0011] Optionally, the mobile terminal further includes: a second filter, a second amplifier, a third filter and a third amplifier;

[0012] The second filter and the second amplifier are connected in series between the built-in antenna and the switch circuit, and the third filter and the third amplifier are connected in series between the external antenna interface and the switch circuit.

[0013] Optionally, the mobile terminal further includes: a first capacitor and a first inductor;

[0014] One end of the first capacitor is connected to the switch circuit, and the other end of the first capacitor is connected to the external antenna interface;

[0015] One end of the first inductor is connected to the external antenna interface, and the other end of the first inductor is connected to the processor.

[0016] Optionally, the processor is further configured to send a second switching control signal to the switch circuit if it is determined that the signal strength of the external antenna is lower than a strength threshold;

[0017] The switch circuit is also used to disconnect the external antenna from the positioning circuit and connect the internal antenna to the positioning circuit in response to a second switching control signal sent by the processor.

[0018] On the other hand, a mobile terminal is provided, the mobile terminal comprising: a processor, a switch circuit, a positioning circuit, a built-in antenna, an external antenna interface and an external antenna;

[0019] The external antenna is pluggably connected to the external antenna interface, and the accuracy of the external antenna is higher than that of the internal antenna;

[0020] The processor is connected to the switch circuit and the external antenna interface respectively, and the processor is used to: if it is detected that the external antenna interface is connected to the external antenna, send a first switching control signal to the switch circuit, and if it is determined that the signal strength of the external antenna is lower than a strength threshold, send a second switching control signal to the switch circuit;

[0021] The switch circuit is also connected to the built-in antenna, the external antenna interface and the positioning circuit respectively, and the switch circuit is used to: disconnect the built-in antenna from the positioning circuit and connect the external antenna interface with the positioning circuit in response to the first switching control signal, and disconnect the external antenna from the positioning circuit and connect the built-in antenna with the positioning circuit in response to the second switching control signal sent by the processor;

[0022] The positioning circuit is used to determine the position of the mobile terminal based on the antenna signal received by the built-in antenna or the antenna signal received by the external antenna interface.

[0023] Optionally, the external antenna includes: an antenna body, a second capacitor and a second inductor;

[0024] One end of the second capacitor is connected to the switch circuit, and the other end of the second capacitor is connected to the antenna body;

[0025] One end of the second inductor is connected to the switch circuit, and the other end of the second inductor is grounded.

[0026] In yet another aspect, a method for switching antennas of a mobile terminal is provided, which is applied to a processor in the mobile terminal described in the above aspect; the method comprises:

[0027] If it is determined that the external antenna interface is connected to the external antenna, disconnect the internal antenna from the positioning circuit;

[0028] The external antenna interface is connected to the positioning circuit.

[0029] Optionally, after connecting the external antenna interface to the positioning circuit, the method further includes:

[0030] Obtaining the signal strength of the external antenna;

[0031] If it is determined that the signal strength is lower than the strength threshold, disconnecting the external antenna interface from the positioning circuit;

[0032] The built-in antenna is connected to the positioning circuit.

[0033] Optionally, after connecting the built-in antenna to the positioning circuit, the method further includes:

[0034] After a target time period has passed since the built-in antenna and the positioning circuit were connected, disconnecting the built-in antenna from the positioning circuit and connecting the external antenna interface to the positioning circuit;

[0035] The operation of obtaining the signal strength of the external antenna is performed again.

[0036] On the other hand, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium. When the instructions are executed on a computer, the computer executes the antenna switching method for a mobile terminal as described in the above aspects.

[0037] On the other hand, a computer program product comprising instructions is provided. When the computer program product is executed on the computer, the computer is enabled to execute the antenna switching method for the mobile terminal described in the above aspects.

[0038] The beneficial effects of the technical solution provided by this application include at least:

[0039] The present application provides a mobile terminal and an antenna switching method thereof, wherein the mobile terminal includes an external antenna interface for connecting to an external antenna, and the external antenna has a higher precision than a built-in antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, the processor controls the switch circuit to connect the external antenna interface to the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the precision of the external antenna is high, the positioning precision of the mobile terminal based on the signal of the external antenna is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a schematic diagram of a mobile terminal provided in an embodiment of the present application;

[0042] Figure 2 is a structural schematic diagram of a mobile terminal provided in an embodiment of the present application;

[0043] Figure 3 is a structural schematic diagram of an external antenna provided in an embodiment of the present application;

[0044] Figure 4 is a structural schematic diagram of another mobile terminal provided in an embodiment of the present application;

[0045] Figure 5 is a structural diagram of another mobile terminal provided in an embodiment of the present application;

[0046] Figure 6 is a schematic diagram of another mobile terminal provided in an embodiment of the present application;

[0047] Figure 7 is a structural diagram of another mobile terminal provided in an embodiment of the present application;

[0048] Figure 8 is a structural diagram of another mobile terminal provided in an embodiment of the present application;

[0049] Fig. 9 is a structural diagram of another mobile terminal provided in an embodiment of the present application;

[0050] Fig.10 is a flow chart of an antenna switching method for a mobile terminal provided in an embodiment of the present application;

[0051] Fig.11 It is a flowchart of another antenna switching method of a mobile terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] The present application embodiment provides a mobile terminal, which may be a smart phone, a tablet computer, a laptop computer, a desktop computer, a router, a customer premise equipment (CPE), etc. For example, see Figure 1 , the mobile terminal may be a tablet computer.

[0054] Combination Figure 1 and Figure 2 It can be seen that the mobile terminal may include: a processor 01, a switch circuit 02, a positioning circuit 03, a built-in antenna 04 and an external antenna interface 05. The built-in antenna 04 may be located at the top of the mobile terminal, and the external antenna interface 05 may be located at the side of the mobile terminal, for example, Figure 1 The external antenna interface 05 may be located on the upper side of the mobile terminal, that is, the side close to the camera of the mobile terminal.

[0055] The external antenna interface 05 can be used to connect an external antenna, and the accuracy of the external antenna is higher than that of the internal antenna. The positioning circuit 03 can be used to determine the location of the mobile terminal based on the antenna signal received by the internal antenna 04 or the antenna signal received by the external antenna interface 05. If the external antenna interface 05 is not connected to the external antenna, the positioning circuit 03 can be connected to the internal antenna 04 and determine the location of the mobile terminal based on the signal received by the internal antenna 04.

[0056] In the embodiment of the present application, the processor 01 may be connected to the switch circuit 02 and the external antenna interface 05 respectively. The processor 01 may be configured to send a first switching control signal to the switch circuit 02 if it is detected that the external antenna interface 05 is connected to the external antenna. Figure 1 The switch circuit 02 can also be connected to the internal antenna 04, the external antenna interface 05 and the positioning circuit 03 respectively. The switch circuit 02 can be used to disconnect the internal antenna 04 from the positioning circuit 03 and connect the external antenna interface 05 to the positioning circuit 03 in response to the first switching control signal sent by the processor 01.

[0057] That is, the switch circuit 02 can connect the external antenna to the positioning circuit 03 when the external antenna is connected to the external antenna interface 05, so that the positioning circuit 03 can determine the current position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is higher than that of the internal antenna 04, the position determined by the mobile terminal based on the signal received by the external antenna is more accurate.

[0058] In summary, an embodiment of the present application provides a mobile terminal, which includes an external antenna interface for connecting to an external antenna, and the accuracy of the external antenna is higher than that of the internal antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, it can control the switch circuit to connect the external antenna interface with the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is high, the accuracy of positioning of the mobile terminal based on the signal of the external antenna is high.

[0059] In an embodiment of the present application, a pin of the processor 01 can be connected to the external antenna interface 05. When the external antenna is connected to the external antenna interface 05, the voltage on the pin changes. For example, when the external antenna is not connected to the external antenna interface 05, the connection line between the external antenna and the pin is disconnected, the connection line is in a high impedance state, and the pin level is high. When the external antenna is connected to the external antenna interface 05, the connection line between the external antenna and the pin is turned on, the connection line is in a low impedance state, and the pin level is low.

[0060] Therefore, the processor 01 can monitor the level change of the pin in real time. If it is determined that the level of the pin becomes low, the processor 01 can determine that the external antenna interface 05 is connected to the external antenna, generate a first switching control signal, and send the first switching control signal to the switch circuit 02.

[0061] Optionally, the switch circuit 02 may be an electronic switch, such as a single-pole double-throw electronic switch. The positioning circuit 03 may be a global navigation satellite system integrated circuit (GNSS IC). The built-in antenna 04 may be a planar inverted F antenna (PIFA), and the built-in antenna 04 may be disposed inside the housing of the mobile terminal. The external antenna may be a patch antenna, such as Figure 3 The ceramic patch antenna 06 is shown. Figure 3As can be seen in the figure, the antenna 06 may include an antenna module 061 and an antenna connector 062 connected to the antenna module 061. The external antenna interface 05 of the mobile terminal may be used to connect (e.g., threaded or plugged) to the antenna connector 062 of the external antenna 06. The external antenna interface 05 may be located on the upper side of the mobile terminal, and the iron sheet antenna may be encapsulated in a housing, which may be made of plastic.

[0062] Among them, when the radiating surface of the ceramic patch antenna faces upward (that is, the radiating surface is away from the ground) and is located in an open and unobstructed environment, the radiation performance is high and the received signal is strong, so the positioning accuracy based on the signal received by the antenna is high. However, when the radiating surface of the ceramic patch antenna faces downward or is in an obstructed environment (such as under an overpass, indoors or in a parking lot), the radiation performance is poor, the received signal is weak, and it cannot be used normally.

[0063] PIFA is simple in design, low in cost, small in size, and can radiate omnidirectionally, that is, it can receive signals from all directions, so PIFA is suitable for various scenarios (i.e. open environments and shielded environments). However, the radiation performance of PIFA in a single direction is relatively low, and the received signal is weaker than that of a ceramic patch antenna, so the accuracy of the position determined based on PIFA is low.

[0064] Table 1 shows the signal strength C / N0 (i.e., carrier-to-noise power spectral density ratio) of the signals received by the ceramic patch antenna and PIFA in different application environments. The unit of the signal strength is decibel Hertz (dBHz). It can be seen from Table 1 that in an open environment, the signal strength of the ceramic patch antenna is 42dBHz, while the signal strength of the PIFA is 39dBHz. The signal strength of the PIFA is lower than that of the ceramic patch antenna. In an indoor environment, the signal strength of the ceramic patch antenna is 25dBHz, while the signal strength of the IPFA antenna is 32dBHz. The signal strength of the PIFA is higher than that of the ceramic patch antenna.

[0065] Table 1

[0066]

[0067] In an embodiment of the present application, an external antenna (such as a ceramic patch antenna) is used in combination with a built-in antenna (PIFA) so that the external antenna and the built-in antenna can complement each other in function, thereby meeting the user's usage requirements in different usage scenarios. For example, when the mobile terminal needs to perform high-precision positioning, the ceramic patch antenna can be connected. Accordingly, when the mobile terminal detects that the external antenna is connected to the external antenna interface 05, the switch circuit 02 can be controlled to connect the external antenna interface 05 with the positioning circuit 03, so that the positioning circuit 03 can determine the position of the mobile terminal based on the signal received by the external antenna for high-precision positioning.

[0068] Figure 4 is a schematic diagram of the structure of another mobile terminal provided in an embodiment of the present application. Figure 4 The mobile terminal may further include: a first filter 071 and a first amplifier 081. The first filter 071 and the first amplifier 081 may be connected in series between the switch circuit 02 and the positioning circuit 03.

[0069] That is, the switch circuit 02, the first filter 071, the first amplifier 081 and the positioning circuit 03 included in the mobile terminal are connected in sequence. Correspondingly, the built-in antenna 04 and the external antenna interface 05 can be connected to the first filter 071 through the switch circuit 02. Among them, the switch circuit 02, the first filter 071, the first amplifier 081 and the positioning circuit 03 can be called the RF receiving circuit of the antenna. The first filter 071 can filter the signal entering the first filter 071 to reduce the signal noise. The first amplifier 081 can amplify the signal entering the first amplifier 081 to increase the signal amplitude or power.

[0070] In this case, if the switching circuit 02 receives a first switching control signal sent by the processor 01, the switching circuit 02 can respond to the first switching control signal, disconnect the connection between the built-in antenna 04 and the first filter 071, and connect the external antenna interface 05 and the first filter 071, thereby disconnecting the connection between the built-in antenna 04 and the positioning circuit 03, and connecting the external antenna interface 05 and the positioning circuit 03.

[0071] Figure 5 is a schematic diagram of the structure of another mobile terminal provided in an embodiment of the present application. Figure 5 It can be seen that the mobile terminal may include: a second filter 072, a second amplifier 082, a third filter 053 and a third amplifier 083.

[0072] The second filter 072 and the second amplifier 082 may be connected in series between the internal antenna 04 and the switch circuit 02 , and the third filter 073 and the third amplifier 083 may be connected in series between the external antenna interface 05 and the switch circuit 02 .

[0073] That is, the built-in antenna 04, the second filter 072, the second amplifier 082 and the switch circuit 02 can be connected in sequence. The external antenna interface 05, the third filter 073, the third amplifier 083 and the switch circuit 02 can be connected in sequence. Among them, the second filter 072 and the third filter 073 can filter the signal entering themselves to reduce signal noise. The second amplifier 082 and the third amplifier 083 can amplify the signal entering themselves to increase the signal amplitude or power.

[0074] In this case, if the switch circuit 02 receives the first switching control signal sent by the processor 01, the switch circuit 02 can respond to the first switching control signal, disconnect the second amplifier 082 from the switch circuit 02, and connect the third amplifier 083 to the switch circuit 02, thereby disconnecting the built-in antenna 04 from the positioning circuit 03, and connecting the external antenna interface 05 to the positioning circuit 03.

[0075] Since the signal will attenuate after passing through the switch circuit 02, and the embodiment of the present application sets the second filter 072, the third filter 073, the second amplifier 082 and the third amplifier 083, so that the switch circuit 02 can be set after the second amplifier 082 and the third amplifier 083, so the signal received by the antenna can be amplified first and then pass through the switch circuit 02, thereby effectively reducing the noise coefficient of the RF receiving circuit of the mobile terminal, that is, reducing the insertion loss of the mobile terminal, for example, the insertion loss can be reduced to about 1 decibel (dB). Among them, the insertion loss is positively correlated with the noise coefficient.

[0076] from Figure 5 It can be seen that the processor 01 can also be connected to the second amplifier 082 and the third amplifier 083, and can be used to control the working state of the second amplifier 082 and the third amplifier 083. For example, one pin of the processor 01 can be connected to the second amplifier 082, and another pin can be connected to the third amplifier. When the external antenna interface 05 is not connected to the external antenna, that is, when the switch circuit 02 connects the built-in antenna 04 and the positioning circuit 03, the processor 01 can provide a high-level signal to the second amplifier 082 and a low-level signal to the third amplifier 083, so that the second amplifier 082 can be in a working state and the third amplifier 083 can be in a non-working state, so that the positioning circuit 03 can determine the position of the mobile terminal based on the signal received by the built-in antenna 04.

[0077] When the external antenna interface 05 is connected to the external antenna, that is, the switch circuit 02 connects the external antenna interface 05 and the positioning circuit in response to the first switching control signal sent by the processor 01, the processor 01 can provide a high-level signal to the third amplifier 083 and a low-level signal to the second amplifier 082, so that the third amplifier 083 can be in a working state and the second amplifier 082 can be in a non-working state, thereby enabling the positioning circuit 03 to determine the position of the mobile terminal based on the signal received by the external antenna.

[0078] Optionally, each of the first filter 071, the second filter 072 and the third filter 073 may be a surface acoustic wave (SAW) filter. Each of the first amplifier 081, the second amplifier 082 and the third amplifier 083 may be an external low noise amplifier (ELNA).

[0079] In the examples of this application, see Figure 4 and Figure 5 The mobile terminal may further include: a first capacitor 09 and a first inductor 10. One end of the first capacitor 09 may be connected to the switch circuit 02, and the other end of the first capacitor 09 may be connected to the external antenna interface 05. One end of the first inductor 10 may be connected to the external antenna interface 05, and the other end of the first inductor 10 may be connected to the processor 01.

[0080] The first capacitor 09 allows AC signals to pass through and blocks DC signals, and the first inductor 10 allows DC signals to pass through and blocks AC signals. Thus, when the external antenna interface 05 is connected to the external antenna, the DC signal is prevented from entering the RF receiving circuit of the antenna to damage the RF receiving circuit, and the AC RF signal received by the external antenna is prevented from entering the processor 01 to damage the processor 01.

[0081] Optionally, the capacity of the first capacitor may be greater than or equal to 27 picofarads (pF) and less than or equal to 100 pF, for example, the capacity of the first capacitor may be 33 pF. The inductance of the first inductor may be greater than or equal to 47 nanohenries (nH) and less than or equal to 200 nH, for example, the inductance of the first inductor may be 68 nH or 82 nH.

[0082] See also Figure 4 and Figure 5 One end of the first inductor 10 can be connected between the external antenna interface 05 and the first capacitor 09. Figure 5It can also be seen that if the built-in antenna 01 is connected to the switch circuit 02 through the second filter 072 and the second amplifier 082, and the external antenna interface 05 is connected to the switch circuit 02 through the third filter 073 and the third amplifier 083, then one end of the first capacitor 09 can be connected to the second filter 072.

[0083] from Figure 4 and Figure 5 It can also be seen that the processor 01 can also be connected to the positioning circuit 03. After connecting the external antenna 06 and the positioning circuit 03, the processor 01 can receive the signal strength of the external antenna sent by the positioning circuit 03. Afterwards, the processor 01 can compare the signal strength with the pre-stored strength threshold. If it is determined that the signal strength is lower than the strength threshold, it can be determined that the signal currently received by the external antenna 06 is weak, and a second switching control signal can be sent to the switch circuit 02. After receiving the second switching control signal, the switch circuit 02 can disconnect the external antenna 06 from the positioning circuit 03 in response to the second switching control signal, and connect the internal antenna 04 and the positioning circuit 03, so that the positioning circuit 03 can perform positioning based on the signal received by the internal antenna 04.

[0084] The signal strength may be the average of the signal strengths of a specified number (e.g., 4) of the stronger signals among the signals transmitted by multiple satellites (e.g., 12 satellites) received by the external antenna 06. For example, after receiving 12 signals, the positioning circuit 03 may first sort the signal strengths of the 12 signals in descending order of signal strength, and then determine the average of the first 4 signal strengths as the signal strength of the external antenna.

[0085] In an embodiment of the present application, the mobile terminal may further include: a printed circuit board (PCB), and the above-mentioned processor 01, switching circuit 02, positioning circuit 03, external antenna interface 05, filter, amplifier, first capacitor 09 and first inductor 10 may all be arranged on the PCB.

[0086] In summary, an embodiment of the present application provides a mobile terminal, which includes an external antenna interface for connecting to an external antenna, and the accuracy of the external antenna is higher than that of the internal antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, it can control the switch circuit to connect the external antenna interface with the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is high, the accuracy of positioning of the mobile terminal based on the signal of the external antenna is high.

[0087] The present application embodiment provides a mobile terminal, which may be a smart phone, a tablet computer, a laptop computer, a desktop computer, a router, a customer premise equipment (CPE), etc. For example, see Figure 6 , the mobile terminal may be a tablet computer.

[0088] Combination Figure 6 and Figure 7 It can be seen that the mobile terminal may include: a processor 01, a switch circuit 02, a positioning circuit 03, a built-in antenna 04, an external antenna interface 05, and an external antenna 06. The built-in antenna 04 may be located at the top of the mobile terminal, and the external antenna interface 05 may be located at the side of the mobile terminal, for example, Figure 1 The external antenna interface 05 may be located at the upper side of the mobile terminal, and correspondingly, the external antenna 06 may be located at the upper end of the mobile terminal.

[0089] The external antenna 06 can be pluggably connected to the external antenna interface 05, and the accuracy of the external antenna 06 is higher than that of the internal antenna 04. The positioning circuit 03 can be used to determine the position of the mobile terminal based on the antenna signal received by the internal antenna 04 or the antenna signal received by the external antenna 06 interface.

[0090] The processor 01 may be connected to the switch circuit 02 and the external antenna interface 05 respectively, and may be used to send a first switching control signal to the switch circuit 02 if it is detected that the external antenna interface 05 is connected to the external antenna 06 .

[0091] The switch circuit 02 can also be respectively connected to the internal antenna 04, the external antenna interface 05 and the positioning circuit 03. The switch circuit 02 can be used to disconnect the internal antenna 04 from the positioning circuit 03 and connect the external antenna interface 05 to the positioning circuit 03 in response to a first switching control signal sent by the processor 01.

[0092] That is, when the external antenna 06 is connected to the external antenna interface 05, the switch circuit 02 can connect the external antenna 06 with the positioning circuit 03, so that the positioning circuit 03 can determine the current position of the mobile terminal based on the signal received by the external antenna 06. Since the accuracy of the external antenna 06 is higher than that of the internal antenna 04, the position determined by the mobile terminal based on the signal received by the external antenna 06 is more accurate.

[0093] Furthermore, the processor 01 may also obtain the signal strength of the external antenna 06 when the external antenna interface 05 is connected to the external antenna 06. Afterwards, the processor 01 may compare the signal strength with a pre-stored strength threshold. If it is determined that the signal strength is lower than the strength threshold, it may be determined that the signal currently received by the external antenna 06 is weak, and a second switching control signal may be sent to the switch circuit 02. After receiving the second switching control signal, the switch circuit 02 may also disconnect the external antenna 06 from the positioning circuit 03 in response to the second switching control signal, and connect the internal antenna 04 to the positioning circuit 03, so that the positioning circuit 03 may perform positioning based on the signal received by the internal antenna 04.

[0094] In summary, an embodiment of the present application provides a mobile terminal, which includes an external antenna interface for connecting to an external antenna, and the accuracy of the external antenna is higher than that of the internal antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, it can control the switch circuit to connect the external antenna interface with the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is high, the accuracy of positioning of the mobile terminal based on the signal of the external antenna is high.

[0095] See also Figure 6 The mobile terminal may further include a housing 11 for encapsulating the external antenna 06. Optionally, the housing 11 may be made of plastic.

[0096] In an alternative implementation, see Figure 8 , the mobile terminal may further include: a first filter 081 and a first amplifier 091. The first filter 081 and the first amplifier 091 may be connected in series between the switch circuit 02 and the positioning circuit 03. The functions of the first filter 081 and the first amplifier 091 may refer to the above embodiment, and the embodiments of the present application will not be repeated here.

[0097] In another alternative implementation, see Fig. 9 The mobile terminal may further include: a second filter 072, a second amplifier 082, a third filter 073 and a third amplifier 083. The second filter 072 and the second amplifier 082 may be connected in series between the built-in antenna 04 and the switch circuit 02, and the third filter 073 and the third amplifier 083 may be connected in series between the external antenna interface 05 and the switch circuit 02. The role of the second filter 082, the role of the third filter 083, the role of the second amplifier 092 and the role of the third amplifier 093 may refer to the above embodiment, and the embodiment of the present application will not be repeated here.

[0098] In the examples of this application, see Figure 8 and Fig. 9 The mobile terminal further includes: a first capacitor 09 and a first inductor 10. One end of the first capacitor 09 can be connected to the switch circuit 02, and the other end of the first capacitor 09 can be connected to the external antenna interface 05. One end of the first inductor 09 can be connected to the external antenna interface 05, and the other end of the first inductor 10 can be connected to the processor 01.

[0099] like Figure 8 and Fig. 9 As shown, the external antenna 06 may include an antenna module 061 and an antenna connector ( Figure 8 and Fig. 9 (not shown), the antenna connector can be pluggably connected to the external antenna interface 05. Figure 8 and Fig. 9 As can be seen in the figure, the antenna module 061 of the external antenna 06 may include: an antenna body 0611, a second capacitor 0612, and a second inductor 0613. One end of the second capacitor 0612 may be connected to the switch circuit 02, and the other end of the second capacitor 0612 may be connected to the antenna body 0611. One end of the second inductor 0613 may be connected to the switch circuit 02, and the other end of the second inductor 0613 may be grounded.

[0100] Optionally, the capacity of the second capacitor may be greater than or equal to 27pF and less than or equal to 100pF, for example, the capacity of the second capacitor may be 33pF. The inductance of the second inductor may be greater than or equal to 47nH and less than or equal to 200nH, for example, the inductance of the second inductor may be 68nH or 82nH.

[0101] In the embodiment of the present application, since the first capacitor 09, the second capacitor 0612, the first inductor 10 and the second inductor 0613 are provided, and the first capacitor 09 and the second capacitor 0612 can allow AC signals to pass through and block DC signals, and the first inductor 10 and the second inductor 0613 can allow DC signals to pass through and block AC signals. Therefore, when the external antenna 06 is connected to the external antenna interface 05, the AC RF signal on the antenna body 0611 of the external antenna 06 can flow to the third filter 073 through the second capacitor 0612 and the first capacitor 09 in sequence, and then flow to the positioning circuit 03 through the third amplifier 083 and the switch circuit 02. In this process, the second inductor 0613 can block the AC RF signal from entering the ground, thereby avoiding the loss of the AC RF signal, and the first inductor 10 can block the AC RF signal from entering the processor 01, thereby avoiding damage to the processor 01, thereby extending the service life of the mobile terminal.

[0102] Furthermore, when the DC signal on the processor 01 passes through the first inductor 10 and the second inductor 0613 in sequence and then flows into the ground, the first capacitor 09 can block the DC signal from flowing into the RF receiving circuit of the antenna, thereby avoiding damage to the RF receiving circuit. The second capacitor 0612 can block the DC signal from flowing into the antenna body 0611 of the external antenna 06, thereby avoiding damage to the antenna body 0611, thereby extending the service life of the mobile terminal.

[0103] The mobile terminal provided in the embodiment of the present application may include a built-in antenna and an external antenna, and the two antennas can be switched for use. For example, if the mobile terminal needs to perform high-precision positioning, the external antenna interface 05 and the external antenna 06 can be connected, that is, the external antenna 06 can be switched. Moreover, after the external antenna interface 05 and the external antenna 06 are connected, if the signal received by the external antenna 06 is weak, the processor 01 of the mobile terminal can connect the built-in antenna 04 and the positioning circuit, that is, switch to the built-in antenna 04, so that the positioning circuit 03 can continue to perform positioning based on the signal received by the built-in antenna 04, and switch to the external antenna 06 when the signal received by the external antenna 06 is strong. Compared with the mobile terminal in the related art that can only perform positioning based on one built-in antenna, the mobile terminal provided in the embodiment of the present application has higher flexibility in use and higher accuracy in determining the position.

[0104] In summary, an embodiment of the present application provides a mobile terminal, which includes an external antenna interface for connecting to an external antenna, and the accuracy of the external antenna is higher than that of the internal antenna. When the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, it can control the switch circuit to connect the external antenna interface with the positioning circuit, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is high, the accuracy of positioning of the mobile terminal based on the signal of the external antenna is high.

[0105] The embodiment of the present application provides an antenna switching method for a mobile terminal. The method can be applied to a processor of the mobile terminal. The mobile terminal can be the mobile terminal provided in the above embodiment, for example Figure 1 , Figure 2 ,or Figures 4 to 9 Any of the mobile terminals shown. Fig.10 , the method may include:

[0106] Step 201: If it is determined that the external antenna interface is connected to the external antenna, the connection between the internal antenna and the positioning circuit is disconnected.

[0107] In an embodiment of the present application, if the processor determines that the external antenna is connected to the external antenna interface, a first switching control signal may be sent to the switch circuit. After receiving the first switching control signal, the switch circuit may disconnect the internal antenna from the positioning circuit in response to the first switching control signal.

[0108] Step 202: connect the external antenna interface to the positioning circuit.

[0109] The switch circuit can also connect the external antenna interface with the positioning circuit in response to the first switching control signal, so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna. Since the accuracy of the external antenna is higher than the accuracy of the internal antenna, the mobile terminal has a higher accuracy in positioning based on the signal received by the external antenna.

[0110] In summary, the embodiment of the present application provides an antenna switching method for a mobile terminal, and the processor of the mobile terminal can disconnect the connection between the internal antenna and the positioning circuit and connect the external antenna interface to the positioning circuit when detecting that the external antenna is connected to the external antenna interface. As a result, the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna, and because the accuracy of the external antenna is higher than that of the internal antenna, the mobile terminal has a higher accuracy in positioning based on the signal received by the external antenna.

[0111] Fig.11 Another antenna switching method for a mobile terminal provided in an embodiment of the present application can be applied to a processor of a mobile terminal. The mobile terminal can be the mobile terminal provided in the above embodiment, for example Figure 1 , Figure 2 or Figures 4 to 9 Any of the mobile terminals shown. Fig.11 , the method may include:

[0112] Step 301: If it is detected that the external antenna interface is connected to the external antenna, the connection between the internal antenna and the positioning circuit is disconnected.

[0113] In the embodiment of the present application, after the mobile terminal is started, if the processor of the mobile terminal detects that the external antenna interface is connected to the external antenna, the processor determines that a first switching control signal can be sent to the switch circuit. After receiving the first switching control signal, the switch circuit can disconnect the internal antenna from the positioning circuit in response to the first switching control signal.

[0114] Step 302: connect the external antenna interface to the positioning circuit.

[0115] In response to the first switching control signal, the switch circuit can also connect the external antenna with the positioning circuit, so that the positioning circuit can determine the location of the mobile terminal based on the signal received by the external antenna.

[0116] Step 303: Obtain the signal strength of the external antenna.

[0117] After the processor controls the switch circuit to connect the external antenna interface with the positioning circuit, the positioning circuit of the mobile terminal can obtain the signal received by the external antenna, determine the signal strength of the external antenna based on the signal, and send the signal strength to the processor. Accordingly, the processor can obtain the signal strength of the external antenna.

[0118] Step 304: Determine whether the signal strength of the external antenna is lower than a strength threshold.

[0119] In the embodiment of the present application, after obtaining the signal strength of the external antenna, the processor may determine whether the signal strength is lower than the strength threshold. If the processor determines that the signal strength of the external antenna is lower than the strength threshold, step 305 may be executed. If the processor determines that the signal strength of the external antenna is higher than the strength threshold, step 304 is continued. The strength threshold may be pre-stored in the mobile terminal, for example, the strength threshold is 30 dBHz.

[0120] After obtaining the signal strength of the external antenna, the processor may compare the signal strength with the strength threshold. If the processor determines that the signal strength is greater than the strength threshold, it may be determined that the signal currently received by the external antenna is relatively strong, and step 303 may be continued. If the processor determines that the signal strength is less than or equal to the strength threshold, it may be determined that the signal currently received by the external antenna is relatively weak, and step 305 may be performed.

[0121] For example, assuming that the strength threshold is 30 dBHz, the signal strength of the external antenna determined by the processor is 40 dBHz. Since 40 is greater than 30, the processor may determine that the signal strength of the external antenna is higher than the strength threshold, and then may continue to execute step 303.

[0122] Assume that the signal strength of the external antenna determined by the processor is 25 dBHz. Since 25 is less than 30, the processor may determine that the signal strength of the external antenna is lower than the strength threshold, and then may execute step 305.

[0123] Step 305: disconnect the external antenna interface from the positioning circuit, and connect the internal antenna to the positioning circuit.

[0124] If the processor determines that the signal strength of the external antenna is less than or equal to the strength threshold, it can disconnect the external antenna interface from the positioning circuit and connect the internal antenna to the positioning circuit so that the positioning circuit can determine the position of the mobile terminal based on the signal received by the internal antenna.

[0125] Step 306: Determine whether the signal strength of the external antenna is lower than the signal strength of the internal antenna.

[0126] After the processor connects the built-in antenna to the positioning circuit, it can determine the signal strength of the built-in antenna. After that, the processor can determine whether the signal strength of the external antenna recently acquired is lower than the signal strength of the built-in antenna. If it is determined that the signal strength of the external antenna is higher than or equal to the signal strength of the built-in antenna, step 302 can be executed to ensure the positioning accuracy of the mobile terminal. If the processor determines that the signal strength of the external antenna is lower than the signal strength of the built-in antenna, step 307 can be executed to monitor the signal strength of the external antenna, and determine the position of the mobile terminal based on the signal received by the external antenna in time when the signal strength of the external antenna is strong.

[0127] It should be noted that if the processor determines that the signal strength of the external antenna most recently obtained is higher than or equal to the signal strength of the internal antenna, after executing steps 302 to 304, if it is determined that the signal strength of the external antenna is still lower than the strength threshold, the processor may execute step 305 after the target time after the external antenna interface is connected to the positioning circuit. Optionally, the target time may be pre-stored in the mobile terminal, for example, the target time may be 30 seconds (s).

[0128] Step 307: After the target time period after the built-in antenna and the positioning circuit are connected, the connection between the built-in antenna and the positioning circuit is disconnected, and the external antenna interface and the positioning circuit are connected.

[0129] After the built-in antenna is connected to the positioning circuit, when the processor determines that the signal strength of the external antenna is lower than the signal strength of the built-in antenna, the built-in antenna and the positioning circuit may be disconnected after the target time after the built-in antenna and the positioning circuit are connected, and the external antenna interface and the positioning circuit are connected. Afterwards, the processor may execute step 303 again to monitor the signal strength of the external antenna, and determine the location of the mobile terminal based on the signal received by the external antenna in a timely manner when the signal strength of the external antenna is strong.

[0130] It should be noted that the order of the steps of the antenna switching method for a mobile terminal provided in the embodiment of the present application can be appropriately adjusted, and the steps can also be increased or decreased accordingly according to the situation. For example, step 303 and step 307 can be deleted according to the situation, that is, when the processor detects that the external antenna is connected to the external antenna interface, it can switch to the external antenna, and subsequently determine the position of the mobile terminal only based on the signal received by the external antenna. Any technician familiar with the technical field can easily think of a change method within the technical scope disclosed in this application, which should be covered within the scope of protection of this application, so it will not be repeated.

[0131] In summary, the embodiment of the present application provides an antenna switching method for a mobile terminal, and the processor of the mobile terminal can disconnect the connection between the internal antenna and the positioning circuit and connect the external antenna interface to the positioning circuit when detecting that the external antenna is connected to the external antenna interface. As a result, the positioning circuit can determine the position of the mobile terminal based on the signal received by the external antenna, and because the accuracy of the external antenna is higher than that of the internal antenna, the mobile terminal has a higher accuracy in positioning based on the signal received by the external antenna.

[0132] The embodiment of the present application provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a computer, the computer executes the antenna switching method of the mobile terminal provided in the above embodiment, for example Fig.10 or Fig.11 The method shown.

[0133] The present application also provides a computer program product including instructions. When the computer program product is run on a computer, the computer executes the antenna switching method of the mobile terminal provided in the above method embodiment. For example, Fig.10 or Fig.11 The method shown.

[0134] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0135] The above are merely exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A mobile terminal, characterized in that: The mobile terminal includes: a processor, a switch circuit, a positioning circuit, a built-in antenna, an external antenna interface, a housing, a first filter, a first amplifier, a first capacitor and a first inductor, the external antenna interface is used to connect an external antenna, the accuracy of the external antenna is higher than that of the built-in antenna, and the external antenna includes: an antenna body, a second capacitor and a second inductor; The external antenna is a ceramic patch antenna, and the external antenna includes an antenna module and an antenna connector, the antenna connector is connected to the antenna module, the antenna connector is threadedly connected or plugged with the external antenna interface, the external antenna interface is located on the upper side of the mobile terminal, and the external antenna is placed in the shell of the mobile terminal, and the shell is made of plastic; The processor is connected to the switch circuit and the external antenna interface respectively, and the processor is used to send a first switching control signal to the switch circuit if it is detected that the external antenna interface is connected to the external antenna; The switch circuit is also connected to the built-in antenna, the external antenna interface and the positioning circuit respectively, and the switch circuit is used to disconnect the built-in antenna from the positioning circuit and connect the external antenna interface with the positioning circuit in response to a first switching control signal sent by the processor, wherein the built-in antenna is a planar inverted F antenna and is arranged on the inner side of the housing of the mobile terminal; The positioning circuit is used to determine the position of the mobile terminal based on the antenna signal received by the built-in antenna or the antenna signal received by the external antenna interface; The first filter and the first amplifier are connected in series between the switch circuit and the positioning circuit; one end of the first capacitor is connected to the switch circuit, and the other end of the first capacitor is connected to the external antenna interface; one end of the first inductor is connected to the external antenna interface, and the other end of the first inductor is connected to the processor; one end of the second capacitor is connected to the switch circuit, and the other end of the second capacitor is connected to the antenna body; one end of the second inductor is connected to the second capacitor, and the other end of the second inductor is grounded; The processor is also used to, if the external antenna interface is connected to the positioning circuit, obtain signals respectively transmitted by M satellites to obtain M signals, sort the M signals in order of signal strength from high to low to obtain a signal sorting result, and determine the average value of the first N signals in the signal sorting result as the signal strength of the external antenna; if the signal strength of the external antenna is lower than the strength threshold, send a second switching control signal to the switching circuit; the switching circuit is also used to disconnect the external antenna interface from the positioning circuit in response to the second switching control signal sent by the processor, and connect the built-in antenna with the positioning circuit, M and N are both positive integers, and N is less than M.

2. The mobile terminal according to claim 1, characterized in that: The mobile terminal further includes: a second filter, a second amplifier, a third filter and a third amplifier; The second filter and the second amplifier are connected in series between the built-in antenna and the switch circuit, and the third filter and the third amplifier are connected in series between the external antenna interface and the switch circuit.

3. A method for switching antennas of a mobile terminal, characterized in that: A processor applied to the mobile terminal, the mobile terminal also includes: a switching circuit, a positioning circuit, a built-in antenna, an external antenna interface, a shell, a first filter, a first amplifier, a first capacitor and a first inductor, the external antenna interface is used to connect an external antenna, the accuracy of the external antenna is higher than that of the built-in antenna, the external antenna includes: an antenna body, a second capacitor and a second inductor; the external antenna is a ceramic patch antenna, the external antenna includes an antenna module and an antenna connector, the antenna connector is connected to the antenna module, the antenna connector is threaded or plugged with the external antenna interface, the external antenna interface is located on the upper side of the mobile terminal, the external antenna is placed in the shell of the mobile terminal, and the shell is plastic; the processor is respectively connected to the switching circuit and the external antenna interface, the switching circuit is also respectively connected to the built-in antenna, the external antenna interface and the positioning circuit, the switching circuit is used to disconnect the built-in antenna from the positioning circuit in response to a first switching control signal sent by the processor , and connect the external antenna interface with the positioning circuit, the built-in antenna is a planar inverted F antenna and is arranged on the inner side of the shell of the mobile terminal; the positioning circuit is used to determine the position of the mobile terminal based on the antenna signal received by the built-in antenna or the antenna signal received by the external antenna interface, and the switch circuit is also used to disconnect the connection between the external antenna interface and the positioning circuit in response to the second switching control signal sent by the processor, and connect the built-in antenna with the positioning circuit; the first filter and the first amplifier are connected in series between the switch circuit and the positioning circuit; one end of the first capacitor is connected to the switch circuit, and the other end of the first capacitor is connected to the external antenna interface; one end of the first inductor is connected to the external antenna interface, and the other end of the first inductor is connected to the processor; one end of the second capacitor is connected to the switch circuit, and the other end of the second capacitor is connected to the antenna body; one end of the second inductor is connected to the second capacitor, and the other end of the second inductor is grounded; The method comprises: If it is determined that the external antenna interface is connected to the external antenna, a first switching control signal is sent to the switch circuit to disconnect the internal antenna from the positioning circuit and connect the external antenna interface to the positioning circuit; After connecting the external antenna interface with the positioning circuit, obtain the signals respectively transmitted by M satellites to obtain M signals, sort the M signals in order of signal strength from high to low to obtain a signal sorting result, and determine the average value of the first N signals in the signal sorting result as the signal strength of the external antenna; if the signal strength of the external antenna is lower than the strength threshold, send the second switching control signal to the switching circuit to disconnect the external antenna interface from the positioning circuit, and connect the built-in antenna with the positioning circuit, M and N are both positive integers, and N is less than M.

4. The method according to claim 3, characterized in that After the built-in antenna is connected to the positioning circuit, the method further includes: After a target time period has passed since the built-in antenna and the positioning circuit were connected, disconnecting the built-in antenna from the positioning circuit and connecting the external antenna interface to the positioning circuit; The operation of obtaining the signal strength of the external antenna is performed again.

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