Multi-frequency switching circuit for RF signal transceiver and its control method

Abstract

The present application discloses a multi-frequency switching circuit for radio frequency signal transceiver, which includes: a first single-pole multi-throw radio frequency switch, a second single-pole multi-throw radio frequency switch, and at least one power amplifier and at least two band-pass filters connected in parallel between the two. The power amplifier is used to amplify the transmission signals on the corresponding transmission frequency bands respectively, and the band-pass filters are used to allow the received signals on the corresponding reception frequency bands to pass through respectively. The present application also discloses a method for controlling a radio frequency antenna signal transceiver circuit. In the above multi-frequency switching circuit, the power amplifier for transmitting signals and the multiple band-pass filters for receiving signals are directly connected in parallel between the same pair of switches, which significantly simplifies the structure and facilitates design and implementation.

Description

Technical Field

[0001] The present invention relates to radio frequency antenna technology, and more particularly, to a multi-frequency switching circuit for radio frequency signal transceiver applicable to drones and their remote control devices and a control method thereof. Background Art

[0002] The wireless communication link is an important part of the drone system. Its main task is to establish a two-way air-ground data transmission channel for completing long-distance remote control, telemetry, and mission information transmission of the drone by the ground control station. The mission information transmission conveys information such as videos and images obtained by the on-board mission sensors to the measurement and control station through the downlink wireless channel, which is the key for the drone to complete the mission, and the quality directly affects the ability to detect and identify targets.

[0003] The drone communication link needs to use radio resources. Currently, the spectrum used by drones in the world is mainly concentrated in the UHF, L, and C bands, and there are also scattered distributions in other frequency bands. The Radio Management Bureau of the Ministry of Industry and Information Technology of China has initially formulated "Matters Concerning the Frequency Use of Drone Systems", planning the frequency bands of 840.5 - 845 MHz, 1430 - 1444 MHz, and 2408 - 2440 MHz for unmanned aircraft systems. However, it should be understood that the frequency bands allowed for drones in different countries are likely to be different. Summary of the Invention

[0004] The object of the present invention is to provide a multi-frequency switching circuit for radio frequency signal transceiver applicable to drones and their remote control devices and a control method thereof, which can at least partially solve the problems in the prior art.

[0005] According to one aspect of the present invention, there is provided a multi-frequency switching circuit for radio frequency signal transceiver, which includes:

[0006] A first single-pole multi-throw radio frequency switch, including a fixed terminal and S moving terminals, the fixed terminal being used to connect to the baseband circuit;

[0007] A second single-pole multi-throw radio frequency switch, including a fixed terminal and S moving terminals, the fixed terminal being used to connect to the radio frequency antenna;

[0008] M power amplifiers and N band-pass filters connected in parallel between the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch, the M power amplifiers being used to amplify the transmission signals on one corresponding frequency band in M transmission frequency bands respectively, and the N band-pass filters being used to allow the received signals on one corresponding frequency band in N reception frequency bands to pass through respectively, where S is greater than or equal to the sum of M and N, M is greater than or equal to 1, and N is greater than or equal to 2.

[0009] In some embodiments, M is 1, and N is less than or equal to 11.

[0010] In some other embodiments, M is greater than or equal to 2, and the input ends of the M power amplifiers are respectively connected to the M moving terminals of the first single-pole multi-throw RF switch, and the output ends of the M power amplifiers are respectively connected to the M moving terminals of the second single-pole multi-throw RF switch; the input ends of the N band-pass filters are respectively connected to the other N moving terminals of the second single-pole multi-throw RF switch, and the output ends of the N band-pass filters are respectively connected to the other N moving terminals of the first single-pole multi-throw RF switch.

[0011] Advantageously, N is greater than M, and at least one of the M transmitting frequency bands covers more than two of the N receiving frequency bands.

[0012] Advantageously, M is 3 and N is 9.

[0013] Advantageously, the N band-pass filters are surface acoustic wave filters or cavity filters.

[0014] Advantageously, the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch are single-pole twelve-throw RF switches.

[0015] Advantageously, the multi-frequency switching circuit further includes a control circuit, and the control circuit controls the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the corresponding N band-pass filters when receiving a signal.

[0016] Advantageously, the multi-frequency switching circuit further includes a control circuit, and the control circuit controls the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the M power amplifiers when transmitting a signal and to turn on one of the N band-pass filters when receiving a signal.

[0017] Advantageously, the signals input to the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch are logic control signals.

[0018] According to another aspect of the present invention, there is provided a method for controlling a radio frequency antenna signal transceiver circuit, including:

[0019] When transmitting a signal, controlling the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the M power amplifiers connected in parallel between the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch, and

[0020] When receiving a signal, controlling the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the N band-pass filters connected in parallel between the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch, where

[0021] The fixed terminal of the first single-pole multi-throw RF switch is connected to the baseband circuit, the fixed terminal of the second single-pole multi-throw RF switch is connected to the RF antenna, the input ends of the M power amplifiers are respectively connected to the M moving terminals of the first single-pole multi-throw RF switch, and the output ends of the M power amplifiers are respectively connected to the M moving terminals of the second single-pole multi-throw RF switch; the input ends of the N band-pass filters are respectively connected to the other N moving terminals of the second single-pole multi-throw RF switch, and the output ends of the N band-pass filters are respectively connected to the other N moving terminals of the first single-pole multi-throw RF switch.

[0022] Advantageously, controlling the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch includes respectively inputting logic control signals into the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch.

[0023] In the multi-frequency switching circuit according to an embodiment of the present invention, the power amplifier for transmitting signals and the multiple band-pass filters for receiving signals are directly connected in parallel between the same pair of switches. In this way, the structure is significantly simplified by omitting the switches and corresponding control circuits for switching between the transmitting circuit and the receiving circuit, etc., which is convenient for design and implementation. The method for controlling the RF antenna signal transceiver circuit according to an embodiment of the present invention is implemented based on such a multi-frequency switching circuit, and its control is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 Schematically shows a drone and its antenna signal transceiver system;

[0026] Figure 2 Is a schematic diagram of a multi-frequency switching circuit for RF signal transceiver according to Embodiment 1 of the present invention;

[0027] Figure 3 Is a schematic diagram of a multi-frequency switching circuit for RF signal transceiver according to Embodiment 2 of the present invention;

[0028] Figure 4 Is a schematic diagram of a multi-frequency switching circuit for RF signal transceiver according to Embodiment 3 of the present invention;

[0029] Figure 5 Is a flowchart of a method for controlling an RF antenna signal transceiver circuit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the related invention and not for limiting the invention. Additionally, it should be noted that for ease of description, only the parts related to the invention are shown in the drawings.

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

[0032] For illustrative purposes only, Figure 1 a drone and its antenna signal transceiver system are schematically shown. As Figure 1 shown, an antenna A for data transmission, for example, is installed on the drone 1, and a corresponding baseband circuit B is equipped. The multi-frequency switching circuit C according to the embodiment of the present invention can be used to connect between the antenna A and the baseband circuit B to help better complete the transceiver of multi-frequency signals. It should be understood that the multi-frequency switching circuit C according to the embodiment of the present invention can also be applied to, for example, the ground station of the drone and other wireless communication fields.

[0033] The following will refer to Figure 2 、 Figure 3 and Figure 4 to introduce the multi-frequency switching circuits according to different embodiments of the present invention respectively.

[0034] Figure 2 Shown is an example of a multi-frequency switching circuit C10 for RF signal transceiver according to Embodiment 1 of the present invention. The multi-frequency switching circuit C10 includes a first single-pole multi-throw RF switch 11a, a second single-pole multi-throw RF switch 11b, and N band-pass filters 12 connected in parallel between the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b. The first single-pole multi-throw RF switch 11a includes a fixed terminal and S moving terminals, where the fixed terminal is used to connect to the baseband circuit B. The second single-pole multi-throw RF switch 11b includes a fixed terminal and S moving terminals, where the fixed terminal is used to connect to the RF antenna A. The N band-pass filters 12 are used to respectively pass the received signals on one corresponding frequency band in multiple received frequency bands.

[0035] As Figure 2 shown, the input ends of the N band-pass filters 12 are respectively connected to the corresponding number (i.e., N) of moving terminals of the second single-pole multi-throw RF switch 11b, and the output ends of the band-pass filters 12 are respectively connected to the corresponding number (i.e., N) of moving terminals of the first single-pole multi-throw RF switch 11a.

[0036] In Figure 2 the shown example, both the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b are single-pole twelve-throw RF switches. Preferably, asFigure 2 As shown, the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b adopt SP12T chips with a stationary terminal arrangement having a symmetric structure (or, an SP12T switch whose trace topology can be made symmetric through state switching), so as to significantly simplify the wiring formed between the two switches.

[0037] The number N of the band-pass filters 12 can be less than or equal to the number S of the moving terminals of the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b. In Figure 2 In the example shown, the number N of the band-pass filters 12 is 12, including band-pass filters 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 12l.

[0038] In some implementation manners, the N band-pass filters 12 can respectively have different center frequencies. For the purpose of example only, the following are given: 433M, 600M, 643M, 700M, 816M, 915M, 1090M, 1440M, 1515M, 1700M, 2200M, 2400M. This can help to expand the applicable range of, for example, an unmanned aerial vehicle equipped with such a multi-frequency switching circuit as much as possible, thereby providing more flexibility and convenience in use. For example, when multiple aircraft are flying at the same site, the above design can enable the frequency bands of each unmanned aerial vehicle to be staggered and not interfere with each other.

[0039] In some other implementation manners, at least two of the N band-pass filters 12 can have the same center frequency, and even the same band-pass filter can be adopted to provide a safety redundancy design. In a situation where the working environment of, for example, an unmanned aerial vehicle is very harsh and the circuit is thus prone to being damaged, this is beneficial to ensuring the normal operation of the RF signal transceiver circuit.

[0040] The band-pass filter 12 is preferably a surface acoustic wave filter or a cavity filter.

[0041] According to this embodiment, the multi-frequency switching circuit C10 can further include a low-noise amplifier (not shown) connected between the moving terminals of the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b.

[0042] As an alternative or supplement, according to this embodiment, the multi-frequency switching circuit C10 can further include a low-noise amplifier 14 connected to the stationary terminal of the first single-pole multi-throw RF switch 11a and / or the second single-pole multi-throw RF switch 11b. Preferably, as Figure 2As shown, the low-noise amplifier 13 can be connected between the fixed terminal of the first single-pole multi-throw RF switch 11a and the baseband circuit B. A low-noise amplifier usually has a very wide operating frequency band. For example, it often reaches 0 - 6 GHz, and 0 - 3 GHz is very common for a low-noise amplifier. In view of this situation, according to this embodiment, setting the low-noise amplifier on the fixed-terminal side of the single-pole multi-throw switch instead of in the multiple filtering branches connected to the moving terminal can greatly simplify the circuit, facilitate the wiring design, and help reduce costs.

[0043] According to this embodiment, the multi-frequency switching circuit C10 may further include a power amplifier 14 for power-amplifying the transmission signal from the baseband circuit B and providing it to the antenna A. As Figure 2 shown, according to this embodiment, the power amplifier 14 is connected in parallel to the fixed terminals of the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b through switches 15a and 15b, for example. The switches 15a and 15b can adopt high-power switches such as PIN Diode (PIN diode) or GaN switch (gallium nitride switch), etc., so as to achieve the effect of high-power transceiver switching.

[0044] According to this embodiment, as Figure 2 shown, the multi-frequency switching circuit C10 may not include a low-noise amplifier for amplifying the signal received by the antenna A in each filtering branch. Preferably, the multi-frequency switching circuit C10 may further include a filter 16 connected in series with the power amplifier 14. The filter 16 can adopt a dielectric filter, for example, and is preferably set to filter the transmission signal amplified by the power amplifier 14 to filter out out-of-band noise.

[0045] In addition, as Figure 2 shown, the multi-frequency switching circuit C10 may further include a control circuit 17, which provides a logic control signal s / s' to control the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b to turn on one of the corresponding N band-pass filters 12 when receiving a signal. The logic control signal provided by the control circuit 17 can be directly provided to the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b, or can be provided to the corresponding first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b after inversion. In Figure 2In the illustrated example, the logic control signal provided by the control circuit 17 is directly provided to one of the first single-pole multi-throw RF switches 11a and the second single-pole multi-throw RF switch 11b, and is provided to the other of the first single-pole multi-throw RF switches 11a and the second single-pole multi-throw RF switch 11b after being inverted. The control circuit 17 can, for example, use an IO expansion chip to reduce the number of IO occupied by the baseband control part, or directly connect when the number of IOs in the baseband control part is sufficient.

[0046] Figure 3 The following shows an example of a multi-frequency switching circuit C20 for RF signal transceiver according to Embodiment 2 of the present invention. As Figure 3 shown, the multi-frequency switching circuit C20 includes a first single-pole multi-throw RF switch 21a, a second single-pole multi-throw RF switch 21b, N band-pass filters 22 connected in parallel between the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b, and a power amplifier 24. The first single-pole multi-throw RF switch 21a includes a fixed terminal and S moving terminals, where the fixed terminal is used to connect to the baseband circuit B. The second single-pole multi-throw RF switch 21b includes a fixed terminal and S moving terminals, where the fixed terminal is used to connect to the RF antenna A. The power amplifier 24 is used to amplify the transmission signal on one frequency band in the transmission band, and the N band-pass filters 22 are used to respectively pass the received signals on the corresponding one frequency band in the multiple received bands.

[0047] As Figure 3 shown, the input ends of the N band-pass filters 22 are respectively connected to the corresponding number (i.e., N) of moving terminals of the second single-pole multi-throw RF switch 21b, and the output ends of the N band-pass filters 22 are respectively connected to the corresponding number (i.e., N) of moving terminals of the first single-pole multi-throw RF switch 21a.

[0048] According to this embodiment, the power amplifier 24 for the transmission signal and the N band-pass filters 22 for the reception signal are directly connected in parallel between the same pair of switches 21a and 21b. Compared with, for example, in the multi-frequency switching circuit C10 according to Embodiment 1, where the power amplifier 14 is connected in parallel outside (the fixed terminal side) of the switches 11a and 11b through additional switches 15a and 15b, the multi-frequency switching circuit C20 significantly simplifies the structure by omitting the switches 15a and 15b and the corresponding control circuits, etc., which is convenient for design and implementation.

[0049] The first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b can have the same or similar structure as the first single-pole multi-throw RF switch 11a and the second single-pole multi-throw RF switch 11b, and will not be elaborated here.

[0050] In Figure 3In the illustrated example, the number N of the band-pass filters 22 is 11, including band-pass filters 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h, 22i, 22j, and 22k. It should be understood that it is feasible that the sum of the number N of the band-pass filters 22 and the number M of the power amplifiers 24 is less than or equal to the number S of the movable terminals of the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b (i.e., S is greater than or equal to the sum of M and N). Preferably, the number N of the band-pass filters 22 is greater than or equal to 2 and less than or equal to 11.

[0051] Similar to that discussed in the first combined embodiment above, the N band-pass filters 22 can be respectively used for different receiving frequency bands, or can be used for the same receiving frequency band, and even the same band-pass filter can be adopted to achieve the same or similar technical effects. Details are not described herein again.

[0052] The band-pass filter 22 is preferably a surface acoustic wave filter or a cavity filter.

[0053] Although Figure 3 not shown in the figure, in an advantageous implementation, the multi-frequency switching circuit C20 may further include low-noise amplifiers respectively connected in series with the respective band-pass filters 22 between the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b. Preferably, in each filtering branch, a single band-pass filter 22 is provided, and the low-noise amplifier is connected between the band-pass filter 22 and the first single-pole multi-throw RF switch 21a. This avoids the use of a filter at the input end of the low-noise amplifier, which can simplify the structure; moreover, compared with the structure in which the low-noise amplifier is arranged at the front end of the filter, although the sensitivity is reduced when the low-noise amplifier is located at the rear end of the filter in this structure, since the amplification is performed after the filter filters out the out-of-band noise, the actual signal-to-noise ratio improvement effect is good, which is particularly suitable for multi-frequency switching application scenarios.

[0054] Although Figure 3 not shown in the figure, in an advantageous implementation, the multi-frequency switching circuit C20 may further include a filter connected in series with the power amplifier 24 between the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b. This filter may be the same as or similar to the filter 16 introduced with reference to Figure 2 Details are not described herein again.

[0055] In addition, as Figure 3As shown, the multi-frequency switching circuit C20 may further include a control circuit 27, which provides a logic control signal s / s' to control the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b to turn on one of the corresponding N (N is 11) band-pass filters 22 when receiving a signal, and turn on the power amplifier 24 when transmitting a signal. From the above description, the signals input to the first single-pole multi-throw RF switch 21a and the second single-pole multi-throw RF switch 21b are the logic control signal s / s'. The control circuit 27 itself and the logic control signal it provides may be the same as or similar to the control circuit 17 and its logic control signal introduced with reference to Figure 2 and will not be elaborated here.

[0056] Next, refer to Figure 4 to introduce an example of the multi-frequency switching circuit C30 for RF signal transceiver according to Embodiment 3 of the present invention. The multi-frequency switching circuit C30 according to Embodiment 3 has basically the same structure as the multi-frequency switching circuit C20 according to Embodiment 2, except that: in the multi-frequency switching circuit C30, the number M of power amplifiers 34 connected in parallel between the first single-pole multi-throw RF switch 31a and the second single-pole multi-throw RF switch 31b is 2 or more, and these power amplifiers 34 are used to amplify the power of the transmission signals of different frequency bands. In Figure 4 the shown example, the multi-frequency switching circuit C30 includes 3 power amplifiers 34a, 34b, 34c and 9 band-pass filters 32a, 32b, 32c, 32d, 32e, 32f, 32g, 32h, 32i; only as an example, the power amplifiers 34a, 34b, 34c may be used for, for example, 433 - 915 MHz, 1090 - 1700 MHz, 2200 - 2400 MHz respectively.

[0057] Advantageously, at least one of the M transmission frequency bands of the power amplifier 34 covers two or more of the multiple different reception frequency bands of the band-pass filter 32. In Figure 4 the shown example, the multi-frequency switching circuit C30 includes 9 band-pass filters 32 and 3 power amplifiers. Preferably, the transmission frequency bands of the 3 power amplifiers 34a, 34b, 34c cover the reception frequency bands of the 9 band-pass filters 32.

[0058] The multi-frequency switching circuit C30 according to Embodiment 3 has the advantages of the multi-frequency switching circuit C20 according to Embodiment 2, that is, the structure is significantly simplified by omitting the switches (such as Figure 2 the shown switches 15a, 15b) for switching between the transmission circuit and the reception circuit and the corresponding control circuits, etc., which is convenient for design and implementation. Moreover, according to Embodiment 3, by providing two or more power amplifiers for different transmission frequency bands (such as Figure 4The power amplifiers 34a, 34b, and 34c) shown can solve the problem of limited transmission bandwidth. In particular, when the reception bandwidth is greatly broadened by multiple band-pass filtering branches in the multi-frequency switching circuit, the transmission bandwidth supported by a traditional single power amplifier pales in comparison and can no longer meet the requirements. At this time, adding a power amplifier for transmitting signals in the multi-frequency switching circuit C30 including multiple band-pass filtering branches can well solve the above problem of insufficient transmission bandwidth, which is beneficial to increasing the power of the transmitted signal and improving communication efficiency and quality.

[0059] As Figure 4 shown, the number M of power amplifiers 34 is greater than or equal to 2. The input ends of M ( Figure 4 shown as 3) power amplifiers 34 are respectively connected to the corresponding number (M) of moving terminals of the first single-pole multi-throw RF switch 31a, and the output ends of M power amplifiers 34 are respectively connected to the corresponding number (M) of moving terminals of the second single-pole multi-throw RF switch 31b; the input ends of N band-pass filters 32 are respectively connected to the corresponding number (another N) of moving terminals of the second single-pole multi-throw RF switch 31b, and the output ends of N band-pass filters 32 are respectively connected to the corresponding number (another N) of moving terminals of the first single-pole multi-throw RF switch 31a.

[0060] As Figure 4 shown, the control circuit 37 in the multi-frequency switching circuit C30 provides a logic control signal s / s' to control the first single-pole multi-throw RF switch 31a and the second single-pole multi-throw RF switch 31b, so that one of the corresponding N band-pass filters 32 is turned on when receiving signals, and one of the M power amplifiers 34 is turned on when transmitting signals. Similarly, the signals input to the first single-pole multi-throw RF switch 31a and the second single-pole multi-throw RF switch 31b are the logic control signal s / s'. The control circuit 37 itself and the logic control signal it provides can be the same as or similar to the control circuit 17 and its logic control signal introduced with reference to Figure 2 and will not be elaborated here.

[0061] Other structures of the multi-frequency switching circuit C30 according to Embodiment 3 except for the above specifically introduced structure can be the same as or similar to those of the multi-frequency switching circuit C20 according to Embodiment 2. For the sake of clarity and conciseness, they will not be elaborated here.

[0062] As can be seen from the above, in the multi-frequency switching circuits of Embodiment 2 and Embodiment 3 of the present invention, S is greater than or equal to the sum of M and N, M is greater than or equal to 1, and N is greater than or equal to 2.

[0063] Next, with reference to Figure 5Disclosed is a method 100 for controlling a radio frequency antenna signal transceiver circuit. The method 100 can be implemented based on a radio frequency signal transceiver circuit including a multi-frequency switching circuit such as those according to Embodiment II and Embodiment III of the present invention. Mainly, such a radio frequency signal transceiver circuit includes M power amplifiers and N band-pass filters connected in parallel between a first single-pole multi-throw radio frequency switch and a second single-pole multi-throw radio frequency switch. The stationary terminal of the first single-pole multi-throw radio frequency switch is connected to the baseband circuit, and the stationary terminal of the second single-pole multi-throw radio frequency switch is connected to the radio frequency antenna. The input terminals of the M power amplifiers are respectively connected to the M moving terminals of the first single-pole multi-throw radio frequency switch, and the M output terminals of the power amplifiers are respectively connected to the M moving terminals of the second single-pole multi-throw radio frequency switch. The input terminals of the N band-pass filters are respectively connected to the other N moving terminals of the second single-pole multi-throw radio frequency switch, and the output terminals of the N band-pass filters are respectively connected to the other N moving terminals of the first single-pole multi-throw radio frequency switch. Preferably, M is greater than or equal to 1, and N is greater than or equal to 2.

[0064] Figure 5 FIG. is a flowchart of the method 100 for controlling a radio frequency antenna signal transceiver circuit. As Figure 5 shown, the method 100 includes:

[0065] S110: When transmitting a signal, control the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch to turn on one of the M power amplifiers connected in parallel between the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch, and

[0066] S120: When receiving a signal, control the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch to turn on one of the N band-pass filters connected in parallel between the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch.

[0067] In an advantageous implementation, controlling the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch includes respectively inputting logic control signals to the first single-pole multi-throw radio frequency switch and the second single-pole multi-throw radio frequency switch.

[0068] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. A multi-frequency switching circuit for radio frequency signal transceiver, characterized in that, Comprising: A first single-pole multi-throw RF switch, including a stationary terminal and S moving terminals, wherein the stationary terminal is used to connect to a baseband circuit; A second single-pole multi-throw RF switch, including a stationary terminal and S moving terminals, wherein the stationary terminal is used to connect to a RF antenna; M power amplifiers and N band-pass filters connected in parallel between the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch, wherein the M power amplifiers are used to amplify the transmission signals on one corresponding frequency band in M transmission frequency bands respectively, and the N band-pass filters are used to pass the received signals on one corresponding frequency band in N reception frequency bands respectively; Wherein, S is greater than or equal to the sum of M and N, M is greater than or equal to 1, N is greater than or equal to 2, and the input terminals of the M power amplifiers are respectively connected to the M moving terminals of the first single-pole multi-throw RF switch, and the output terminals of the M power amplifiers are respectively connected to the M moving terminals of the second single-pole multi-throw RF switch; the input terminals of the N band-pass filters are respectively connected to the other N moving terminals of the second single-pole multi-throw RF switch, and the output terminals of the N band-pass filters are respectively connected to the other N moving terminals of the first single-pole multi-throw RF switch.

2. The multi-frequency switching circuit according to claim 1, characterized in that M is 1, and N is less than or equal to 11.

3. The multi-frequency switching circuit according to claim 1, wherein M is greater than or equal to 2.

4. The multi-frequency switching circuit according to claim 3, characterized in that, N is greater than M, and at least one of the M transmission frequency bands covers more than two of the N reception frequency bands.

5. The multi-frequency switching circuit according to claim 4, characterized in that, M is 3 and N is 9.

6. The multi-frequency switching circuit according to any one of claims 1-5, characterized in that, The N band-pass filters are surface acoustic wave filters or cavity filters.

7. The multi-frequency switching circuit according to any one of claims 1-5, characterized in that, The first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch are single-pole twelve-throw RF switches.

8. The multi-frequency switching circuit according to claim 1, wherein It further includes a control circuit, which controls the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the corresponding N band-pass filters when receiving signals.

9. The multi-frequency switching circuit according to claim 1, wherein, It further includes a control circuit, which controls the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the M power amplifiers when transmitting signals and turn on one of the N band-pass filters when receiving signals.

10. The multi-frequency switching circuit according to claim 8 or 9, characterized in that, The signals input to the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch are logic control signals.

11. A method for controlling a radio frequency antenna signal transceiver circuit, characterized in that, Comprising: When transmitting signals, control the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the M power amplifiers connected in parallel between the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch, and When receiving signals, control the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch to turn on one of the N band-pass filters connected in parallel between the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch, wherein The stationary terminal of the first single-pole multi-throw RF switch is connected to the baseband circuit, the stationary terminal of the second single-pole multi-throw RF switch is connected to the RF antenna, the input ends of the M power amplifiers are respectively connected to the M moving terminals of the first single-pole multi-throw RF switch, and the output ends of the M power amplifiers are respectively connected to the M moving terminals of the second single-pole multi-throw RF switch; the input ends of the N band-pass filters are respectively connected to the other N moving terminals of the second single-pole multi-throw RF switch, and the output ends of the N band-pass filters are respectively connected to the other N moving terminals of the first single-pole multi-throw RF switch.

12. The method according to claim 11, wherein Controlling the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch includes respectively inputting logic control signals into the first single-pole multi-throw RF switch and the second single-pole multi-throw RF switch.

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