Radio frequency isolation module and communication system

Abstract

The invention provides a radio frequency isolation module and a communication system, which can support output of multi-band signals, have isolation capability, prevent reflected signals from influencing a power amplification circuit or a power amplification module, and have lower insertion loss and reduce intermodulation distortion. The radio frequency isolation module can comprise a shunt circuit, an isolation circuit and a combination circuit. The isolation circuit comprises at least one isolation branch. The shunt circuit comprises an input end and N output ends; the N output ends are in one-to-one correspondence with the N frequency bands, one output end is coupled with one isolation branch, and each output end is used for outputting a signal of the corresponding frequency band to the coupled isolation branch; and each isolation branch is used for transmitting a signal provided by one output end of the coupled shunt circuit to the combining circuit and preventing a signal generated at the combining circuit from being transmitted to the coupled input end of the isolation branch. The combining circuit is used for being coupled with an antenna and combining signals transmitted by all the isolation branches in the isolation circuit.

Description

A radio frequency isolation module and communication system Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a radio frequency isolation module and a communication system. Background Art

[0002] Currently, a remote radio unit (RRU) typically supports RF signals in a single frequency band. It includes a power amplifier module (PAM) and an isolator. The PAM amplifies the RF signal. The isolator typically transmits the amplified signal to the antenna and isolates any reflected signals from the antenna to prevent them from affecting the PAM.

[0003] If the remote radio unit supports RF signals in multiple frequency bands, the power amplifier module in the remote radio unit needs to support more frequency bands and be capable of outputting higher power. At the same time, the isolator in the remote radio unit also needs to be able to operate at higher power and support multiple frequency bands.

[0004] Isolator performance parameters generally include insertion loss and intermodulation distortion (IMD). Insertion loss refers to the signal loss caused by inserting the isolator into a communication system, which can be understood as signal attenuation. When two or more signals of different frequencies act on the same nonlinear circuit, they modulate each other to produce signals with new frequencies. If this new frequency falls within the receiver's operating channel bandwidth, it interferes with the receiver, a phenomenon commonly referred to as intermodulation distortion (IMD).

[0005] However, isolators that can support multiple frequency bands have large insertion loss and large intermodulation distortion, which causes the radio frequency remote units that support multiple frequency bands to have large insertion loss and large intermodulation distortion, affecting the quality of the transmitter transmission signal in the communication system, making it difficult to use in the communication system.

[0006] Summary of the Invention

[0007] An embodiment of the present application provides a radio frequency isolation module and a communication system that can support the output of multi-band signals and has isolation capabilities to prevent reflected signals from affecting the power amplifier circuit or power amplifier module. The radio frequency isolation module also has lower insertion loss and reduces intermodulation distortion.

[0008] In a first aspect, the present application provides a radio frequency isolation module, configured to transmit a target radio frequency signal provided by a power amplifier module to an antenna. The radio frequency isolation module's operating frequency band overlaps the operating frequency band of the power amplifier module, and the operating frequency band of the radio frequency isolation module includes N frequency bands, where N is an integer greater than 1. The radio frequency isolation module may include a shunt circuit, an isolation circuit, and a combiner circuit. The isolation circuit includes at least one isolation branch. The shunt circuit includes an input terminal and N output terminals, wherein the input terminal is configured to couple with the power amplifier module to receive the target radio frequency signal, which includes signals of S frequency bands, where S is an integer less than or equal to N. The N output terminals correspond one-to-one to the N frequency bands, with each output terminal coupled to one isolation branch, and each output terminal is configured to output the signal of the corresponding frequency band to the coupled isolation branch. The shunt circuit is configured to branch the target radio frequency signal into signals of each of the S frequency bands, and output the signals through the output terminals corresponding to each frequency band. Each of the isolation branches is coupled to the combining circuit, configured to transmit a signal provided by an output terminal of the coupled branch circuit to the combining circuit, and to prevent a signal generated at the combining circuit from being transmitted to an input terminal coupled to the isolation branch. The combining circuit is configured to couple to the antenna, combine the signals transmitted by the isolation branches in the isolation circuit, and output the combined signal to the antenna.

[0009] In an embodiment of the present application, the shunt circuit in the RF isolation module can shunt the target RF signal, and can output S-path signals through the S output ends of the shunt circuit. The S-path signals correspond one-to-one to the S frequency bands, and one output end of the shunt circuit outputs a signal containing one frequency band. The S-path signals can be transmitted to the combining circuit through coupled isolation branches respectively. This can reduce the requirements for the operating frequency bands of each isolation branch in the isolation circuit, and adopt an isolator or circulator with lower insertion loss and smaller intermodulation distortion. In addition, each isolation branch also has the function of isolating the signal generated at the combining circuit, thereby protecting the power amplifier module.

[0010] In one possible design, the isolation circuit includes N isolation branches; the N isolation branches correspond one-to-one to the N output terminals. The operating frequency bands of the isolation branches cover the frequency bands corresponding to the output terminals coupled to the isolation branches. In this design, the operating frequency band of each isolation branch includes one frequency band, which reduces the operating frequency band requirements of the isolation branch and enables the use of an isolator or circulator with lower insertion loss and intermodulation distortion.

[0011] In one possible design, the isolation circuit includes M isolation branches, where M is an integer less than N; wherein, among the M isolation branches, one isolation branch is coupled to at least one of the output terminals; and the operating frequency band of the isolation branch covers the frequency band corresponding to the at least one output terminal coupled to the isolation branch. In such a design, the operating frequency band of each isolation branch includes the frequency band corresponding to the output terminal to which it is coupled, and the operating frequency band of each isolation branch does not need to include the N frequency bands, thereby reducing the operating frequency band requirements of each isolation branch and allowing the isolation branch to use an isolator or circulator with lower insertion loss and less intermodulation distortion.

[0012] In any of the above possible designs, the shunt circuit may include at least one shunt. In any of the above possible designs, the isolation branch may include a circulator.

[0013] In any of the aforementioned possible designs, the combining circuit may include a multi-band combiner. Optionally, the combining circuit may further include at least one filter, and the at least one filter may correspond one-to-one with at least one isolation branch. Each isolation branch may be coupled to the multi-band combiner via a corresponding filter. The operating frequency band of each filter overlaps the operating frequency band of the isolation branch to which it is coupled. Each filter may be used to filter the signal provided by the coupled isolation branch, such as filtering out a noise signal.

[0014] Optionally, the operating frequency band of the RF isolation module may cover at least two of the following frequency bands: 758-960 MHz, 1.8 GHz, 2.1 GHz, and 2.6 GHz. This application does not specifically limit the operating frequency band of the RF isolation module, which is only provided for example.

[0015] In a second aspect, an embodiment of the present application provides a communications system, comprising: a transmitter, a power amplification module, and a radio frequency isolation module as provided in the first aspect and any possible design thereof. The transmitter is configured to generate a first radio frequency signal. The power amplification module is coupled to the transmitter and the radio frequency isolation module, respectively, and is configured to amplify the first radio frequency signal to generate a second radio frequency signal, and output the second radio frequency signal to the radio frequency isolation module. The radio frequency isolation module is configured to couple to an antenna and transmit the second radio frequency signal to the antenna.

[0016] In an embodiment of the present application, the RF isolation module in the communication system has lower insertion loss and reduces intermodulation distortion, and the RF isolation module is arranged between the antenna and the power amplifier module to isolate the antenna and the power amplifier module to prevent the signal at the antenna from affecting the power amplifier module.

[0017] In one possible design, the power amplification module includes a power splitter, multiple power amplification circuits, and a first combiner. The power splitter is coupled to each of the power amplification circuits and is used to distribute the power of the first RF signal and output a third RF signal to each of the power amplification circuits, wherein the total power of all third RF signals output by the power splitter is the same as the power of the first RF signal. Each of the power amplification circuits is coupled to the first combiner and is used to power amplify the received third RF signal and output it to the combiner. The combiner is coupled to the RF isolation module and is used to combine the signals output by the multiple power amplification circuits to obtain the second RF signal and output it to the RF isolation module.

[0018] In such a design, a plurality of power amplifier circuits are provided in the power amplifier module, and the signals output by the plurality of power amplifier circuits are combined into one signal through a first combiner and then output, so that the power amplifier module can output a higher-power RF signal, thereby increasing the power of the RF signal transmitted by the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of an application scenario of a remote radio unit;

[0020] FIG2 is a schematic diagram of the structure of a radio remote unit;

[0021] FIG3 is a schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0022] FIG4 is a schematic diagram of a specific structure of a power amplifier module;

[0023] FIG5 is a schematic structural diagram of a radio frequency isolation module provided in an embodiment of the present application;

[0024] FIG6A is a schematic structural diagram of a shunt circuit;

[0025] FIG6B is a schematic diagram of a specific structure of a shunt circuit;

[0026] FIG6C is a schematic diagram showing the specific structure of another shunt circuit;

[0027] FIG6D is a schematic diagram of a specific structure of another shunt circuit;

[0028] FIG7A is a schematic diagram of the specific structure of a radio frequency isolation module provided in an embodiment of the present application;

[0029] FIG7B is a schematic diagram of the specific structure of another radio frequency isolation module provided in an embodiment of the present application;

[0030] FIG8 is a schematic structural diagram of another radio frequency isolation module provided in an embodiment of the present application;

[0031] FIG9 is a schematic structural diagram of another radio frequency isolation module provided in an embodiment of the present application;

[0032] FIG10 is a schematic structural diagram of another radio frequency isolation module provided in an embodiment of the present application;

[0033] FIG11 is a schematic structural diagram of another radio frequency isolation module provided in an embodiment of the present application;

[0034] FIG12 is a schematic diagram of the structure of another radio frequency isolation module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In the embodiments of the present application, "or" describes the association relationship of associated objects, indicating that two relationships may exist. For example, A or B may represent: A exists alone, and B exists alone, where A and B may be singular or plural.

[0036] The term "coupling" involved in this application describes the connection relationship between two objects and can represent two connection relationships. For example, the connection between A and B can represent two situations: A is directly connected to B, and A is connected to B through C.

[0037] In the embodiments of this application, the terms "exemplary," "in some embodiments," and "in another embodiment" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete manner.

[0038] In embodiments of the present application, an "antenna" may include any suitable configuration, structure, and / or arrangement of one or more antenna elements, components, units, assemblies, and / or arrays. In some examples, an antenna may use separate transmit and receive antenna elements to implement transmit and receive functions.

[0039] In the embodiments of the present application, the “power amplifier module” may include any suitable configuration, structure and / or arrangement of one or more power amplifiers, components, units, or assemblies.

[0040] In the embodiments of the present application, the "transmitter" may include a digital signal processing, a digital-to-analog converter, a baseband filter, a radio frequency (RF) modulator, a filter, an RF splitter, a switch, and other suitable configurations to implement the transmission function. In some examples, the "transmitter" may be a transceiver that can separately implement the transmission and reception functions. The transceiver may include a digital signal processing, a digital-to-analog converter, a baseband filter, a radio frequency (RF) modulator, a filter, an RF splitter, a switch, and other suitable configurations to implement the transmission function. The transceiver may also include a combiner, a demodulator, a baseband filter, an analog-to-digital converter, and other suitable configurations to implement the reception function.

[0041] In the embodiments of the present application, "path" may refer to a transmission path, a transmission channel, or a transmission line. One "path" may refer to one transmission path, transmission channel, or transmission line. Multiple "paths" may refer to multiple transmission paths, transmission channels, or transmission lines. One "path" signal may refer to a signal transmitted by one transmission path, transmission channel, or transmission line. In some examples, "D" sending one signal may refer to the signal sent by "D" being transmitted through one transmission path, transmission channel, or transmission line. "D" receiving one signal may refer to "D" being able to receive a signal transmitted by one transmission path, transmission channel, or transmission line. "D" receiving multiple signals may refer to "D" being able to receive signals transmitted by multiple transmission paths, transmission lines, or transmission lines.

[0042] In the embodiments of the present application, E and F have a "one-to-one correspondence", indicating that one E corresponds to one F, and one F corresponds to one E. It should be noted that the terms "first" and "second" in the embodiments of the present application are only used for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0043] The radio frequency isolation module provided in the embodiment of the present application can be applied to a variety of communication systems, such as global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), world-wide interoperability for microwave access (WiMAX) communication system or fifth-generation mobile communication technology (5th-generation, 5G), etc. It should be noted that the embodiment of the present application is not limited to a specific communication system.

[0044] In the embodiments of the present application, the "frequency band" may be an existing frequency band and / or a frequency band to be divided in future versions thereof. For example, the "frequency band" may be a frequency band divided by an existing cellular specification and / or protocol (such as the 3rd Generation Partnership Project (3GPP) protocol, the LTE protocol), a frequency band divided by a future version of a cellular specification and / or protocol, a frequency band divided by the wireless fidelity (WiFi) protocol in a wireless local area network, or a frequency band divided by the Bluetooth protocol.

[0045] Figure 1 is a schematic diagram of a communication system architecture applicable to an embodiment of the present application. As shown in Figure 1, the communication system architecture may include a baseband processing unit and a remote radio unit (RRU). The baseband processing unit may be set in a machine room, and the RRU may be set at a location close to the antenna, for example, it may be set on a communication tower where the antenna is located. The base station processing unit, RRU, and antenna shown in Figure 1 are only used to illustrate the communication system architecture and do not indicate the number of antennas or RRUs in the communication system. Generally, the communication system can be implemented as a base station. The base station may include a base station processing unit, at least one antenna, and at least one RRU, and the baseband processing unit may be connected to at least one RRU.

[0046] Existing RRUs support single-band RF signals. To enable a communication system to support multi-band RF signals, at least two RRUs can be set up in the communication system. However, at least two RRUs will occupy a larger space. Alternatively, at least two power amplifier modules supporting different frequency bands can be set up in a single RRU, increasing the space occupied by a single RRU. Alternatively, a power amplifier module supporting multiple frequency bands and having higher power can be set up in a single RRU. Figure 2 shows a schematic diagram of the structure of an RRU that supports multiple frequency bands. The RRU includes a transmitter (TX), a power amplifier circuit, an RF isolation module, and a filter. The transmitter can have the ability to provide multi-band signals. The signal provided by the transmitter can include multiple frequency bands. For example, the signal provided by the transmitter includes signals in a first frequency band and a second frequency band. The power amplifier circuit in the RRU can support power amplification processing of the multi-band signal and output it to the isolator. The function of the isolator is generally to transmit the power-amplified signal to the filter and to isolate the reflected signal generated at the filter or antenna to prevent the reflected signal from affecting the power amplifier circuit.

[0047] In some scenarios, the first and second frequency bands can be any two of the following: 1.8 GHz, 2.1 GHz, and 2.6 GHz. Accordingly, the isolator in the RRU needs to operate in the 1805-2690 MHz frequency band. Isolators that support multiple frequency bands are called ultra-wideband isolators.

[0048] The performance parameters of isolators in communication systems generally include insertion loss and intermodulation distortion (IMD). Insertion loss refers to the signal loss caused by the isolator's insertion into the communication system, which can be understood as signal attenuation. When two or more signals of different frequencies act on the same nonlinear circuit, they modulate each other to generate a new frequency signal. If this new frequency falls within the receiver's operating channel bandwidth, it interferes with the receiver, a phenomenon commonly known as intermodulation distortion (IMD). IMD in communication systems also affects the quality of transmitter signals. The insertion loss of the aforementioned isolator operating in the 1805-2690 MHz band is generally greater than 0.5 dB. Isolators also have a maximum power parameter, which indicates the maximum power they can transmit. The lower the signal power transmitted by the isolator, the lower its IMD. When transmitting signals at the maximum power parameter, the IMD of an isolator in the 1805-2690 MHz band is generally greater than -60 dBc. Existing communication systems generally require intermodulation distortion to be less than -70dBc. This means that the power of the signal transmitted by the isolator in the 1805-2690MHz frequency band in existing communication systems needs to be less than the isolator's maximum power parameter. In other words, the isolator in the 1805-2690MHz frequency band cannot operate at full power.

[0049] In order to reduce the insertion loss of RRU and improve the intermodulation distortion of RRU, an embodiment of the present application provides a radio frequency isolation module that can support the output of multi-band signals and has isolation capabilities to prevent reflected signals from affecting the power amplifier circuit or power amplifier module. The radio frequency isolation module has lower insertion loss and reduces intermodulation distortion. It should be noted that the embodiment of the present application can be applied to but not limited to RRU, and can also be applied to units of the communication system, such as active antenna units (AAUs). The present application does not impose too many restrictions on the application scenarios of the radio frequency isolation module. The embodiment of the present application also provides a communication system that may include the radio frequency isolation module provided by the present application. A detailed introduction will be given below with reference to the accompanying drawings. It should be noted that the specific frequency bands mentioned in this application are for illustration only and are not intended to be a specific limitation on the frequency bands applicable to the radio frequency isolation module provided by this application.

[0050] Figure 3 shows a schematic diagram of the structure of a communication system provided in an embodiment of the present application. Communication system 10 may include a transmitter 100, a power amplifier module 101, and a radio frequency isolation module 102 provided in an embodiment of the present application. Transmitter 100, power amplifier module 101, and radio frequency isolation module 102 are coupled in sequence. In this embodiment of the present application, the signals processed by each module in communication system 10 are all radio frequency signals, hereinafter referred to as "signals."

[0051] The transmitter 100 is connected to the input side of the power amplifier module 101. The transmitter 100 can output a signal including at least one frequency band signal. The operating frequency band of the transmitter 100 includes at least one frequency band. The transmitter 100 can have the ability to output signals in at least one frequency band. For example, the transmitter can have the ability to output signals in a first frequency band, and the signal output by the transmitter 100 can include signals in the first frequency band. For another example, the transmitter can have the ability to output signals in the first frequency band or the second frequency band, and the signal output by the transmitter 100 can include signals in the first frequency band, or the signal output by the transmitter 100 can include signals in the second frequency band, or the signal output by the transmitter 100 can include signals in the first frequency band and signals in the second frequency band.

[0052] In the communication system 10, the operating frequency band of the power amplifier module 101 may include or cover the operating frequency band of the transmitter 100. The frequency band included in the output signal of the power amplifier module 101 is the same as the frequency band included in the signal received by the power amplifier module 101, that is, the power amplifier module 101 does not change the frequency band of the signal. The power amplifier module 101 can amplify at least one frequency band signal provided by the transmitter 100. For example, if one channel of the signal provided by the transmitter 100 includes a signal of the first frequency band, the power amplifier module 101 can amplify the signal of the first frequency band. For another example, if one channel of the signal provided by the transmitter 100 includes a signal of the first frequency band and a signal of the second frequency band, the power amplifier module 101 can amplify the signal of the first frequency band and amplify the signal of the second frequency band.

[0053] The operating frequency band of the RF isolation module 102 may include or cover the operating frequency band supported by the power amplifier circuit 101. Since the operating frequency band of the power amplifier module 101 includes or covers the operating frequency band of the transmitter 100, it can be seen that the operating frequency band supported by the RF isolation module 102 also includes or covers the operating frequency band of the transmitter 100. The RF isolation module 102 has signal transmission capability and isolation capability. Among them, the RF isolation module 102 provided in the embodiment of the present application can support high-power signal transmission and has low insertion loss and low intermodulation distortion. The RF isolation module 102 can isolate the signal at the antenna 103 from the power amplifier module 101, thereby preventing the signal at the antenna 103 from being transmitted to the power amplifier module 101, thereby protecting the power amplifier module 101.

[0054] Exemplarily, the power amplification module 101 may include a power splitter 101A, multiple power amplification circuits, and a first combiner 101B. Figure 4 shows a schematic diagram of the specific structure of the power amplification module according to an exemplary embodiment. The power amplification module 101 may include a power splitter 101A, d power amplification circuits, and a first combiner 101B, where d is an integer greater than 1.

[0055] The input side of the power divider 101A may include a first input terminal, and the output side of the power divider 101A may include d first output terminals. The d first output terminals of the power divider 101A correspond one-to-one to the d power amplifier circuits. One first output terminal corresponds to one power amplifier circuit, and one power amplifier circuit corresponds to one first output terminal. The power divider 101A can divide a signal received at the first input terminal into d signals, and output them to the power amplifier circuits corresponding to each first output terminal through the d first output terminals. The operating frequency band of the power amplifier module 101 may include one or more frequency bands. The operating frequency band of each power amplifier circuit may be the same as the operating frequency band of the power amplifier module 101. Each of the d power amplifier circuits of the power amplifier module 101 can amplify the received signal.

[0056] The input side of the first combiner 101B may include d second input terminals, and the output side of the first combiner 101B may include a second output terminal. The d second input terminals may correspond one-to-one with the d power amplifier circuits, with each second input terminal corresponding to one power amplifier circuit, and each power amplifier circuit corresponding to one second input terminal. Each power amplifier circuit outputs an amplified signal to its corresponding second input terminal. The first combiner 101B may combine the signals received by each second input terminal and output them through a second output terminal, for example, to the RF isolation module 102. Thus, the power amplifier module 101 in the communication system 10 outputs one signal to the RF isolation module 102.

[0057] The power amplifier module 101 in the communication system 10 provided in the embodiment of the present application can output higher power. The radio frequency isolation module 102 provided in the embodiment of the present application can support the transmission of higher power signals. The radio frequency isolation module 102 provided in the embodiment of the present application is introduced below.

[0058] FIG5 illustrates a radio frequency isolation module provided in an embodiment of the present application. Radio frequency isolation module 102 can be coupled to power amplifier module 101. Optionally, power amplifier module 101 can have the structure shown in FIG4. Power amplifier module 101 can also have other structures, which are not specifically limited in this embodiment of the present application.

[0059] The radio frequency isolation module 102 may include a branch circuit 201, an isolation circuit 202, and a combining circuit 203. The isolation circuit 202 may include at least one isolation branch.

[0060] The shunt circuit 201 may include an input terminal and N output terminals, wherein the input terminal is used to couple with the power amplifier module 101 to receive the target RF signal. The target RF signal may include signals of S frequency bands, where S is an integer less than or equal to N. The N output terminals correspond one-to-one to the N frequency bands, one output terminal is coupled to one isolation branch, and each output terminal is used to output the signal of the corresponding frequency band to the coupled isolation branch. The shunt circuit 201 can be used to perform shunt processing on the target RF signal, dividing it into signals of each frequency band included in the S frequency bands, and outputting them through the output terminal corresponding to each frequency band.

[0061] Each of the isolation branches is coupled to the combining circuit 203, and each of the isolation branches can be used to transmit the signal provided by one of the output ends of the coupled branch circuit to the combining circuit 203, and prevent the signal generated at the combining circuit 203 from being transmitted to the input end coupled to the isolation branch.

[0062] The combining circuit 203 is configured to couple with the antenna 103 , combine the signals transmitted by the isolation branches in the isolation circuit 202 , and output the combined signals to the antenna 103 .

[0063] First, let's introduce branching circuit 201. Branching circuit 201 can have inter-frequency branching capabilities. When a signal received by branching circuit 201 contains signals in multiple frequency bands, branching circuit 102 can separate the signal into multiple signals, each of which contains a signal in a single frequency band. In other words, branching circuit 201 can separate a signal containing multiple frequency bands into multiple signals containing a single frequency band for output.

[0064] In one example, the branch circuit 201 receives a signal including a signal of a first frequency band and a signal of a second frequency band. The branch circuit 201 may separate the received signal into two signals, wherein the two separated signals are respectively recorded as a first signal and a second signal, wherein the first signal includes a signal of a first frequency band, and the second signal includes a signal of a second frequency band. In another example, the branch circuit 201 receives a signal including a signal of a first frequency band, a signal of a second frequency band, and a signal of a third frequency band. The branch circuit 201 may separate the received signal into three signals, wherein, among the three separated signals, the first signal includes a signal of a first frequency band, the second signal includes a signal of a second frequency band, and the third signal includes a signal of a third frequency band. In one possible scenario, when the branch circuit 201 receives a signal including a frequency band signal, the branch circuit 201 may output the received signal.

[0065] The input side of the shunt circuit 201 is coupled to the power amplifier module 101. The input side of the shunt circuit 201 has an input terminal. The input terminal of the shunt circuit 201 can be used to receive a signal provided by the power amplifier module 101. For example, the input terminal of the shunt circuit 201 can receive the signal provided by the power amplifier module 101, wherein the signal provided by the power amplifier module 101 may include a signal of at least one frequency band.

[0066] The output side of the shunt circuit 201 is coupled to the isolation circuit 202. The output side of the shunt circuit 201 includes multiple output terminals. The operating frequency band of the shunt circuit 201 includes N frequency bands, and the output side of the shunt circuit 201 includes N output terminals, where N is an integer greater than 1. The N output terminals correspond one-to-one to the N frequency bands, with one output terminal corresponding to one frequency band, and one frequency band corresponding to one output terminal. Each of the N output terminals is used to output a signal, and the output signal includes a signal of the frequency band corresponding to the output terminal. The multiple output terminals of the shunt circuit 201 are respectively connected to the isolation circuit 202.

[0067] Figure 6A shows a schematic diagram of the structure of a shunt circuit according to an exemplary embodiment. The input side of the shunt circuit 201 may include one input terminal Z1. The output side of the shunt circuit 201 may include N output terminals P, each output terminal outputting one signal, and thus the N output terminals output N signals. N may be an integer greater than or equal to X. For ease of description, the i-th output terminal among the N output terminals is denoted as output terminal Pi, where i can range from 1 to N, and the frequency band corresponding to output terminal Pi is denoted as frequency band mi.

[0068] For example, in a scenario where the branch circuit 201 has three output terminals and has the capability of processing three frequency bands of different frequency bands, that is, when X is 3 and N is 3, the frequency band corresponding to the output terminal P1 is the frequency band m1, the frequency band corresponding to the output terminal P2 is the frequency band m2, and the frequency band corresponding to the output terminal P3 is the frequency band m3.

[0069] The aforementioned functions of the shunt circuit 201 can be implemented by one or more shunts. In one example, the shunt circuit 201 can include one shunt. As shown in FIG6B , the shunt circuit 201 can include shunt 1. The input side of the first shunt has one input terminal, and the output side has N output terminals. The N output terminals of the first shunt can be implemented as the N output terminals of the shunt circuit 201.

[0070] In another example, shunt circuit 201 may include multiple shunts. Each of the multiple shunts may have multiple outputs. As shown in FIG6C , the multiple shunts may include a second shunt and at least one third shunt. The input of the second shunt serves as the input of shunt circuit 201. The second shunt has multiple outputs, some of which may serve as outputs of shunt circuit 201, while others may be coupled to the inputs of at least one third shunt. All outputs of the at least one third shunt also serve as outputs of shunt circuit 201.

[0071] As shown in FIG6D , the plurality of splitters may include a second splitter and a plurality of third splitters. The input end of the second splitter serves as the input end of the splitter circuit 201. The second splitter has a plurality of output ends. The plurality of output ends of the second splitter correspond one-to-one with the plurality of third splitters. One output end of the second splitter is coupled to the input end of the corresponding third splitter. All output ends of the plurality of third splitters serve as the output ends of the splitter circuit 201.

[0072] In the above examples, the specific structure of the shunt circuit 201 shown in FIG. 6B to FIG. 6D is only for illustration, and this application does not impose any further limitations thereon.

[0073] The operating frequency band of the RF isolation module 102 provided in the embodiment of the present application includes N frequency bands, that is, the RF isolation module 102 can support N frequency bands. The operating frequency band of the shunt circuit 201 can cover or include the operating frequency band of the RF isolation module 102 .

[0074] In one possible scenario, the operating frequency band of the RF isolation module 102 is the same as the operating frequency band of the shunt circuit 201. In another possible scenario, the operating frequency band of the shunt circuit 201 covers the operating frequency band of the RF isolation module 102, and the operating frequency band range of the shunt circuit 201 is larger than the operating frequency band range of the RF isolation module 102. For example, the operating frequency band of the RF isolation module 102 includes N frequency bands, and the output side of the shunt circuit 102 includes X output terminals, where the X output terminals may include the aforementioned N output terminals. In this case, X is greater than N. That is, the X frequency bands supported by the shunt circuit 102 include the N frequency bands supported by the RF isolation module 102. In this case, N of the X output terminals of the shunt circuit 201 can correspond one-to-one to the N frequency bands supported by the RF isolation module 102.

[0075] Please continue to refer to Figure 5. The isolation circuit 202 is coupled to the input side of the combining circuit 203. The isolation circuit 202 can have the ability to transmit signals in one direction. The isolation circuit 202 can transmit at least one signal provided by the shunt circuit 201 to the combining circuit 203, and isolate the signal generated at the combining circuit 203 from the shunt circuit 201. Since the signal output by the shunt circuit 201 only contains a signal of a single frequency band, and different output ends output signals of different frequency bands, the isolation circuit 202 transmits at least one signal provided by the shunt circuit 201 to the combining circuit 203, and the isolation circuit 202 also transmits at least one frequency band signal to the combining circuit 203.

[0076] The output side of the combiner circuit 203 is coupled to the antenna 103. The combiner circuit 203 can have filtering and frequency-combining functions. The combiner circuit 201 can combine multiple signals of different frequency bands at the input side of the combiner circuit 201 into one signal and output it to the antenna 103. In other words, the combiner circuit 203 can be used to perform frequency-combination on the multiple signals transmitted by the isolation circuit 202 and output one signal to the antenna 103. The signal output by the combiner circuit 203 to the antenna 103 includes signals of at least two frequency bands.

[0077] Please refer to Figure 6A and assume that, among the N output terminals of the shunt circuit 201, the output terminal P1 corresponds to the first frequency band and the output terminal P2 corresponds to the second frequency band. In one example, the power amplifier module 101 provides the shunt circuit 201 with a signal including a first frequency band signal and a second frequency band signal. The control shunt circuit 201 can perform frequency splitting processing on the received signal, output the signal of the first frequency band through the output terminal P1, and output the signal of the second frequency band through the output terminal P2. The isolation circuit 202 can transmit the signal of the first frequency band provided by the output terminal P1 and the signal of the second frequency band provided by the output terminal P2 to the combining circuit 203. The combining circuit 203 can combine the signal of the first frequency band provided by the output terminal P1 and the signal of the second frequency band provided by the output terminal P2, that is, combine the two signals into one signal, and provide the combined signal to the antenna 103. At this time, the signal output by the combining circuit 203 to the antenna includes the signal of the first frequency band and the signal of the second frequency band.

[0078] The operating frequency band of the isolation circuit 202 can be the same as the operating frequency band of the RF isolation module 102, or the operating frequency band of the isolation circuit 202 can overlap the operating frequency band of the RF isolation module 102. In one possible design, the output side of the shunt circuit 201 has N output terminals, and the isolation circuit 202 includes N isolation branches. That is, the number of isolation branches in the isolation circuit 202 is the same as the number of output terminals of the shunt circuit 201. The number of isolation branches in the isolation circuit 202 is the same as the number of input terminals of the combiner circuit 203. Examples are provided below to illustrate each of these.

[0079] In one possible design, FIG7A exemplarily illustrates a schematic diagram of the specific structure of a radio frequency isolation module. RF isolation module 102 can be coupled to power amplifier module 101. Optionally, power amplifier module 101 can have the structure shown in FIG4 . Power amplifier module 101 can also adopt other structures, which are not specifically limited in this embodiment of the present application.

[0080] In the RF isolation module 102, the shunt circuit 201 has N output terminals, and the isolation circuit 202 may include N isolation branches, where the N isolation branches may correspond one-to-one with the N output terminals P of the shunt circuit 201. One isolation branch corresponds to one output terminal, and one output terminal corresponds to one isolation branch. The isolation branch is coupled to the output terminal P corresponding to the isolation branch. For ease of description, the isolation branch corresponding to the output terminal Pi is denoted as isolation branch Qi, where i ranges from 1 to N. The operating frequency band of isolation branch Qi may include the frequency band corresponding to the output terminal Pi. For example, the frequency band corresponding to the output terminal P1 is frequency band m1, and the operating frequency band of isolation branch Q1 includes or overlaps frequency band m1. In some examples, the operating frequency band of isolation branch Qi is the same as the frequency band corresponding to the output terminal Pi. In other examples, the operating frequency band of isolation branch Qi may include the frequency band corresponding to the output terminal Pi, or in other words, the operating frequency band of isolation branch Qi overlaps the frequency band corresponding to the output terminal Pi.

[0081] The input side of combiner circuit 203 may have N input terminals, each of which corresponds to one of the N isolation branches. Each isolation branch corresponds to one input terminal, and each input terminal corresponds to one isolation branch. The isolation branches are coupled to the corresponding input terminals. For ease of description, the i-th input terminal of combiner circuit 203 is denoted as input terminal Ki.

[0082] The signal output from the output terminal Pi of the shunt circuit 201 can be transmitted to the input terminal Ki of the combiner circuit 203 via the isolation branch Qi. It can be seen that each output terminal of the shunt circuit 201 is transmitted to the combiner circuit 203 via an isolation branch, and any isolation branch Qi can isolate the reflected signal generated at the combiner circuit 203 to prevent the reflected signal from affecting the power amplifier module 101. Any isolation branch Qi can include an isolator or a circulator. Such a design can reduce the requirements for the operating frequency band range of the isolation branch Qi. Using an isolator or circulator with a smaller operating frequency band can reduce the insertion loss and intermodulation distortion range of the RF isolation module 102. The intermodulation distortion generated by the isolator or circulator with a smaller operating frequency band when the transmission signal power is at maximum power can meet the communication system's requirements for intermodulation distortion. The isolator or circulator with a smaller operating frequency band can operate at full power, allowing the RF isolation module 102 to support higher power.

[0083] In some scenarios, the combining circuit 203 may include a multi-band combiner, a first side of the multi-band combiner may be coupled to the input ends of the combining circuit 203 , and a second side of the multi-band combiner may be coupled to the antenna 103 .

[0084] In other scenarios, the combining circuit 203 may include the multi-band combiner and at least one filter. The at least one filter may correspond one-to-one with at least one input terminal of the combining circuit 203. In other words, the at least one filter in the combining circuit 203 may correspond one-to-one with at least one isolation branch in the isolation circuit 202. The input terminal of each filter may be coupled to a corresponding input terminal, or the input terminal of each filter may serve as the input terminal of the combining circuit 203 and be coupled to the corresponding isolation branch. The output terminal of each filter is coupled to the multi-band combiner. Each filter may have a filtering function, such as filtering noise signals. The operating frequency band of each filter may be the same as the operating frequency band of the isolation branch to which it is coupled. Each filter may filter the signal provided by the coupled isolation branch and then output it to the multi-band combiner. In one possible scenario, multiple filters may provide signals to the multi-band combiner. The multi-band combiner may perform inter-frequency combining on the signals provided by the multiple filters and output a single signal, which is then transmitted to the antenna 103 for transmission. In another possible scenario, one filter provides a signal to the multi-band combiner, and the multi-band combiner may also output the signal provided by the one filter to the antenna 103 for transmission.

[0085] In one possible implementation, based on the structure of the RF isolation module 102 shown in FIG7A , as shown in FIG7B , the RF isolation module 102 may further include N functional circuits, with the N isolation branches in the isolation circuit 202 corresponding one-to-one to the N functional circuits. The functional circuit corresponding to the isolation branch Qi can be denoted as functional circuit Wi, where i ranges from 1 to N. The isolation branch Qi is coupled to the input terminal Ki of the combiner circuit 203 via functional circuit Wi. In one example, functional circuit Qi can be used to perform impedance matching on the signal transmitted by the isolation branch Qi.

[0086] In one example, FIG8 shows a schematic diagram of the specific structure of a radio frequency isolation module 102. The radio frequency isolation module 102 can be coupled to the power amplifier module 101. Optionally, the power amplifier module 101 can have the structure shown in FIG4. The power amplifier module 101 can also adopt other structures, which are not specifically limited in the embodiments of the present application.

[0087] The operating frequency band of the RF isolation module 102 may include two frequency bands, respectively designated as a first frequency band and a second frequency band. The shunt circuit 201 may include two output terminals. Output terminal P1 corresponds to the first frequency band, and output terminal P2 corresponds to the second frequency band. The isolation circuit 202 may include two isolation branches, namely, isolation branch Q1 and isolation branch Q2, wherein isolation branch Q1 is coupled to output terminal P1, and isolation branch Q2 is coupled to output terminal P2. The combiner circuit 203 has two input terminals, namely, input terminal K1 and input terminal K2, wherein input terminal K1 is coupled to isolation branch Q1, and input terminal K2 is coupled to isolation branch Q2.

[0088] The branch circuit 201 can perform frequency splitting processing on the received signal. If the signal received by the branch circuit 201 includes a signal of the first frequency band, the branch circuit 201 can output the signal of the first frequency band through the output terminal P1. If the signal received by the branch circuit 201 includes a signal of the second frequency band, the branch circuit 201 can output the signal of the second frequency band through the output terminal P2. If the signal received by the branch circuit 201 includes a signal of the first frequency band and a signal of the second frequency band, the branch circuit 201 performs frequency splitting processing on the received signal, outputs the signal of the first frequency band through the output terminal P1, and outputs the signal of the second frequency band through the output terminal P2.

[0089] The isolation branch Q1 can transmit the signal of the first frequency band provided by the output terminal P1 to the input terminal K1 of the combiner module, and can prevent the reflected signal generated by the combiner circuit 203 from being transmitted to the output terminal P1. The isolation branch Q2 can transmit the signal of the second frequency band provided by the output terminal P2 to the input terminal K2 of the combiner circuit 203, and can prevent the reflected signal generated by the combiner circuit 203 from being transmitted to the output terminal P2. The combiner circuit 203 can perform different-frequency combination of the signals of the first frequency band and the signals of the second frequency band provided by the isolation branches Q1 and Q2, respectively, and after combining them into one signal, output the combined signal to the antenna 103.

[0090] In the above embodiment, the first frequency band may be the 758-960 MHz frequency band, and the second frequency band may be the 1.8 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, and the second frequency band may be the 2.1 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, and the second frequency band may be the 2.6 GHz frequency band. Alternatively, the first frequency band may be the 1.8 GHz frequency band, and the second frequency band may be the 2.1 GHz frequency band. Alternatively, the first frequency band may be the 1.8 GHz frequency band, and the second frequency band may be the 2.6 GHz frequency band. Alternatively, the first frequency band may be the 2.6 GHz frequency band, and the second frequency band may be the 2.1 GHz frequency band.

[0091] In another example, Figure 9 shows a schematic diagram of the specific structure of a radio frequency isolation module. Radio frequency isolation module 102 can be coupled to power amplifier module 101. Optionally, power amplifier module 101 can have the structure shown in Figure 4. Power amplifier module 101 can also adopt other structures, which are not specifically limited in the embodiments of the present application.

[0092] The RF isolation module 102 can support three frequency bands, namely the first frequency band, the second frequency band, and the third frequency band. The shunt circuit 201 can include three output terminals. Output terminal P1 corresponds to the first frequency band, output terminal P2 corresponds to the second frequency band, and output terminal P3 corresponds to the third frequency band.

[0093] Isolation circuit 202 may include three isolation branches: isolation branch Q1 coupled to output terminal P1, isolation branch Q2 coupled to output terminal P2, and isolation branch Q3 coupled to output terminal P3. Combiner circuit 203 has three input terminals: input terminal K1 coupled to isolation branch Q1, input terminal K2 coupled to isolation branch Q2, and output terminal K3 coupled to isolation branch Q3.

[0094] The branch circuit 201 can perform frequency splitting processing on the received signal. If the signal received by the branch circuit 201 includes a signal of the first frequency band, the branch circuit 201 can output the signal of the first frequency band through the output terminal P1. If the signal received by the branch circuit 201 includes a signal of the second frequency band, the branch circuit 201 can output the signal of the second frequency band through the output terminal P2. If the signal received by the branch circuit 201 includes a signal of the third frequency band, the branch circuit 201 can output the signal of the third frequency band through the output terminal P3. If the signal received by the branch circuit 201 includes a signal of the first frequency band and a signal of the second frequency band, the branch circuit 201 performs frequency splitting processing on the received signal, outputs the signal of the first frequency band through the output terminal P1, and outputs the signal of the second frequency band through the output terminal P2. If the signal received by the branch circuit 201 includes a signal of the first frequency band and a signal of the third frequency band, the branch circuit 201 performs frequency splitting processing on the received signal, outputs the signal of the first frequency band through the output terminal P1, and outputs the signal of the third frequency band through the output terminal P3. If the signal received by the branching circuit 201 includes a signal in the second frequency band and a signal in the third frequency band, the branching circuit 201 performs inter-frequency branching processing on the received signal and outputs the signal in the second frequency band through the output terminal P2 and the signal in the third frequency band through the output terminal P3. If the signal received by the branching circuit 201 includes a signal in the first frequency band, a signal in the second frequency band, and a signal in the third frequency band, the branching circuit 201 performs inter-frequency branching processing on the received signal and outputs the signal in the first frequency band through the output terminal P1, the signal in the second frequency band through the output terminal P2, and the signal in the third frequency band through the output terminal P3.

[0095] The isolation branch Q1 can transmit signals of the first frequency band to the input terminal K1 of the combiner circuit 203, and can prevent reflected signals generated at the combiner circuit 203 from being transmitted to the output terminal P1. The isolation branch Q2 can transmit signals of the second frequency band to the input terminal K2 of the combiner circuit 203, and can prevent reflected signals generated at the combiner circuit 203 from being transmitted to the output terminal P2. The isolation branch Q3 can transmit signals of the third frequency band to the input terminal K3 of the combiner circuit 203, and can prevent reflected signals generated at the combiner circuit 203 from being transmitted to the output terminal P3. The combiner circuit 203 can perform different-frequency combination of the signals of the first frequency band, the second frequency band, and the third frequency band provided by the isolation branches Q1, Q2, and Q3, respectively, and after combining the signals into one, output the combined signals to the antenna.

[0096] In the above embodiment, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 1.8 GHz frequency band, and the third frequency band may be the 2.1 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 2.1 GHz frequency band, and the third frequency band may be the 2.6 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 2.6 GHz frequency band, and the third frequency band may be the 1.8 GHz frequency band. Alternatively, the first frequency band may be the 1.8 GHz frequency band, the second frequency band may be the 2.1 GHz frequency band, and the third frequency band may be the 2.6 GHz frequency band.

[0097] In another possible implementation, the number of output terminals of the shunt circuit 201 may be greater than the number of isolation branches in the isolation circuit 202, and the number of isolation branches in the isolation circuit 202 is the same as the number of input terminals of the combiner circuit 203. Examples are provided below to illustrate this. In this implementation, the isolation circuit 202 may include M isolation branches, where M is an integer less than N.

[0098] In one possible design, FIG10 exemplarily illustrates a schematic diagram of the specific structure of a radio frequency isolation module. The radio frequency isolation module 102 can be coupled to the power amplifier module 101. Optionally, the power amplifier module 101 can have the structure shown in FIG4 . The power amplifier module 101 can also adopt other structures, which are not specifically limited in this embodiment of the present application. For details about the shunt circuit 201 in the radio frequency isolation module, refer to the description of the shunt circuit 201 shown in FIG4 , and will not be repeated here.

[0099] In the isolation circuit 202 of the RF isolation module 102, the M isolation branches are M first isolation branches, respectively denoted as first isolation branch Mr-1, first isolation branch Mr-2, ..., first isolation branch Mr-M. For the shunt circuit 201 in the RF isolation module, reference may be made to the relevant description of the shunt circuit 201 shown in FIG. 6A , and will not be repeated here.

[0100] One output terminal of the shunt circuit 201 is coupled to only one of the M first isolation branches. The input side of any one of the M first isolation branches Mr can be coupled to multiple output terminals of the shunt circuit 201. In other words, any one of the first isolation branches Mr can be coupled to at least two output terminals of the shunt circuit 201, and the first isolation branch Mr can receive signals provided by at least two output terminals. The output side of any one of the first isolation branches Mr is coupled to one input terminal of the combiner circuit 203.

[0101] By way of example, the first isolation branch Mr-1 is coupled to the output terminals P1 and P2 of the shunt circuit 201, and to the input terminal K1 of the combiner circuit 203. The operating frequency band of the first isolation branch Mr-1 may include the frequency band corresponding to the output terminal P1 and the frequency band corresponding to the output terminal P2. The first isolation branch Mr-1 can transmit the signals provided by the output terminals P1 and P2 to the input terminal K1 of the combiner circuit 203, and prevent the reflected signals generated at the combiner circuit 203 from being transmitted to the output terminals P1 and P2 of the shunt circuit 201.

[0102] Similarly, the first isolation branch Mr-2 is coupled to the output terminals P3 and P4 of the shunt circuit 201, and to the input terminal K2 of the combiner circuit 203. The operating frequency band of the first isolation branch Mr-2 may include the frequency band corresponding to the output terminal P3 and the frequency band corresponding to the output terminal P4. The first isolation branch Mr-2 may transmit the signals provided by the output terminals P3 and P4 to the input terminal K2 of the combiner circuit 203, and prevent reflected signals generated at the combiner circuit 203 or the antenna 103 from being transmitted to the output terminals P3 and P4 of the shunt circuit 201.

[0103] It should be noted that in some scenarios, the number of output terminals of the shunt circuit 201 coupled to each first isolation branch can be the same. For example, in the above example, the first isolation branch Mr-1 and the first isolation branch Mr-2 are both connected to two input terminals. In other words, the number of frequency bands covered by the working frequency bands of each first isolation branch can be the same. The first isolation branch Mr-1 covers two frequency bands, namely the frequency band corresponding to the output terminal P1 and the frequency band corresponding to the output terminal P2. The first isolation branch Mr-2 covers two frequency bands, namely the frequency band corresponding to the output terminal P3 and the frequency band corresponding to the output terminal P4.

[0104] In other scenarios, the number of output terminals connected to each first isolation branch may be different, or the number of frequency bands covered by the operating frequency band of each first isolation branch may be different. This embodiment of the present application does not impose too many restrictions on this.

[0105] In another possible design, the M isolation branches include at least one first isolation branch Mr and at least one second isolation branch Ms. One output end of the shunt circuit 201 is coupled to only one of the M isolation branches, or in other words, one output end of the shunt circuit 201 is coupled to one first isolation branch or one second isolation branch.

[0106] In this design, the input side of any first isolation branch Mr among the M isolation branches can be coupled to multiple output terminals of the shunt circuit 201. In other words, the first isolation branch Mr can be coupled to at least two output terminals of the shunt circuit 201, and the first isolation branch Mr can receive signals provided by at least two output terminals. The output side of any first isolation branch Mr is coupled to an input terminal of the combiner circuit 203. Optionally, the output terminal of any first isolation branch Mr is coupled to an input terminal of the combiner circuit 203 via a functional circuit, and the functional circuit coupled to the output terminal of the first isolation branch Mr can be used to perform impedance matching on the signal provided by the output terminal of the first isolation branch Mr.

[0107] The input side of any second isolation branch Ms among the M isolation branches can be coupled to an output terminal of the shunt circuit 201, and the second isolation branch Ms can receive a signal provided by an output terminal. The output side of the second isolation branch Ms is coupled to an input terminal of the combiner circuit 203. Optionally, the output terminal of any second isolation branch Ms is coupled to an input terminal of the combiner circuit 203 via a functional circuit. The functional circuit coupled to the output terminal of the second isolation branch Ms can be used to perform impedance matching on the signal provided by the output terminal of the second isolation branch Ms.

[0108] In this design, among the M isolation branches, the first isolation branch may include an isolator or a circulator, and the second isolation branch may include an isolator or a circulator. The number of frequency bands covered by the operating frequency band of the first isolation branch may be greater than or equal to the number of frequency bands covered by the operating frequency band of the second isolation branch.

[0109] Figure 11 illustrates a schematic diagram of the specific structure of a radio frequency isolation module. The radio frequency isolation module 102 can be coupled to the power amplifier module 101. Optionally, the power amplifier module 101 can have the structure shown in Figure 4. The power amplifier module 101 can also adopt other structures, which are not specifically limited in this embodiment of the present application. For details about the shunt circuit 201 in the radio frequency isolation module, refer to the description of the shunt circuit 201 shown in Figure 4 and will not be repeated here.

[0110] The isolation circuit 202 includes M isolation branches. The M isolation branches may include z first isolation branches Mr and x second isolation branches Ms, where z is an integer greater than or equal to 1, x is an integer greater than or equal to 1, and the sum of z and x is M. It should be noted that although the isolation circuit 202 in FIG11 shows a case where z is 2, this does not constitute a specific limitation on the value of z.

[0111] As an example, referring to Figure 11 , the M isolation branches include two first isolation branches and x second isolation branches, where x is M-2. The two first isolation branches are respectively designated as first isolation branch Mr-1 and first isolation branch Mr-2. The x second isolation branches are respectively designated as second isolation branch Ms-1, ..., second isolation branch Ms-x.

[0112] The first isolation branch Mr-1 is coupled to the output terminals P1 and P2 of the shunt circuit 201, and to the input terminal K1 of the combiner circuit 203. The operating frequency band of the first isolation branch Mr-1 may include the frequency band corresponding to the output terminal P1 and the frequency band corresponding to the output terminal P2. The first isolation branch Mr-1 can transmit the signals provided by the output terminals P1 and P2 to the input terminal K1 of the combiner circuit 203, and prevent the reflected signals generated at the combiner circuit 203 from being transmitted to the output terminals P1 and P2 of the shunt circuit 201.

[0113] Similarly, the first isolation branch Mr-2 is coupled to the output terminals P3 and P4 of the shunt circuit 201, and to the input terminal K2 of the combiner circuit 203. The operating frequency band of the first isolation branch Mr-2 may include the frequency band corresponding to the output terminal P3 and the frequency band corresponding to the output terminal P4. The first isolation branch Mr-2 may transmit the signals provided by the output terminals P3 and P4 to the input terminal K2 of the combiner circuit 203, and prevent reflected signals generated at the combiner circuit 203 or the antenna 103 from being transmitted to the output terminals P3 and P4 of the shunt circuit 201.

[0114] The second isolation branch Ms-1 is coupled to the output terminal P5 of the shunt circuit 201 and to the output terminal K3 of the combiner circuit 203. The operating frequency range of the second isolation branch Ms-1 may include the frequency range corresponding to the output terminal P5. The second isolation branch Ms-1 can transmit the signal provided by the output terminal P5 to the input terminal K3 of the combiner circuit 203 and prevent the reflected signal generated by the combiner circuit 203 from being transmitted to the output terminal P5 of the shunt circuit 201.

[0115] Similarly, the second isolation branch Ms-x is coupled to the output terminal PN of the shunt circuit 201 and to the output terminal KM of the combiner circuit 203. The operating frequency range of the second isolation branch Ms-x may include the frequency range corresponding to the output terminal PN. The second isolation branch Ms-x can transmit the signal provided by the output terminal PN to the input terminal KM of the combiner circuit 203 and prevent the reflected signal generated at the combiner circuit 203 from being transmitted to the output terminal PN of the shunt circuit 201.

[0116] As can be seen from the above description, the signal output by the output terminal Pi of the shunt circuit 201 can be transmitted to the combining circuit 203 via the isolation branch coupled to the output terminal Pi. In addition, the isolation branch coupled to the output terminal Pi can isolate the reflected signal generated at the combining circuit 203 to prevent the reflected signal from affecting the power amplifier module. Each isolation branch can include an isolator or a circulator. Such a design can reduce the requirements for the operating frequency band range of each isolation branch. Using an isolator or circulator with a smaller operating frequency band can reduce the insertion loss and intermodulation distortion range of the RF isolation module. In addition, the RF isolation module can support higher power.

[0117] In another example, Figure 12 shows a schematic diagram of the specific structure of a radio frequency isolation module. The radio frequency isolation module 102 can be coupled to the power amplifier module 101. Optionally, the power amplifier module 101 can have the structure shown in Figure 4. The power amplifier module 101 can also adopt other structures, which are not specifically limited in this embodiment of the application. For the shunt circuit 201 in the radio frequency isolation module, refer to the relevant description of the shunt circuit 201 shown in Figure 4 and will not be repeated here.

[0118] The RF isolation module 102 can support three frequency bands, designated as the first frequency band, the second frequency band, and the third frequency band. The shunt circuit 201 can include three output terminals. Output terminal P1 corresponds to the first frequency band, output terminal P2 corresponds to the second frequency band, and output terminal P3 corresponds to the third frequency band. The isolation circuit 202 includes two isolation branches: a first isolation branch Mr-1 and a second isolation branch Ms-1.

[0119] The first isolation branch Mr-1 is coupled to the output terminals P1 and P2, and the second isolation branch Ms-1 is coupled to the output terminal P3. The combiner circuit 203 has two input terminals: input terminal K1 is coupled to the first isolation branch Mr-1, and input terminal K2 is coupled to the second isolation branch Ms-1.

[0120] The branch circuit 201 can perform frequency splitting processing on the received signal. If the signal received by the branch circuit 201 includes a signal of the first frequency band, the branch circuit 201 can output the signal of the first frequency band through the output terminal P1. If the signal received by the branch circuit 201 includes a signal of the second frequency band, the branch circuit 201 can output the signal of the second frequency band through the output terminal P2. If the signal received by the branch circuit 201 includes a signal of the third frequency band, the branch circuit 201 can output the signal of the third frequency band through the output terminal P3. If the signal received by the branch circuit 201 includes a signal of the first frequency band and a signal of the second frequency band, the branch circuit 201 performs frequency splitting processing on the received signal, and outputs the signal of the first frequency band through the output terminal P1, and outputs the signal of the second frequency band through the output terminal P2. If the signal received by the branch circuit 201 includes a signal of the first frequency band and a signal of the third frequency band, the branch circuit 201 performs frequency splitting processing on the received signal, and can output the signal of the first frequency band through the output terminal P1, and output the signal of the third frequency band through the output terminal P3. If the signal received by the branching circuit 201 includes a signal in the second frequency band and a signal in the third frequency band, the branching circuit 201 performs inter-frequency branching processing on the received signal and outputs the signal in the second frequency band through the output terminal P2 and the signal in the third frequency band through the output terminal P3. If the signal received by the branching circuit 201 includes a signal in the first frequency band, a signal in the second frequency band, and a signal in the third frequency band, the branching circuit 201 performs inter-frequency branching processing on the received signal and outputs the signal in the first frequency band through the output terminal P1, the signal in the second frequency band through the output terminal P2, and the signal in the third frequency band through the output terminal P3.

[0121] The first isolation branch Mr-1 can transmit the signal of the first frequency band provided by the output terminal P1 to the input terminal K1 of the combiner circuit 203, and transmit the signal of the second frequency band provided by the output terminal P2 to the input terminal K1 of the combiner circuit 203, and can prevent the reflected signal generated at the combiner circuit 203 from being transmitted to the output terminals P1 and P2. The second isolation branch Ms-1 can transmit the signal of the third frequency band provided by the output terminal P3 to the input terminal K3 of the combiner circuit 203, and can prevent the reflected signal generated at the combiner circuit 203 from being transmitted to the output terminal P3. The combiner circuit 203 can perform different-frequency combination of the signal of the first frequency band and the signal of the second frequency band provided by the first isolation branch Mr-1 and the signal of the third frequency band provided by the second isolation branch Ms-1, and after combining the signals into one, output the combined signal to the antenna 103.

[0122] In the above embodiment, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 1.8 GHz frequency band, and the third frequency band may be the 2.1 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 2.1 GHz frequency band, and the third frequency band may be the 2.6 GHz frequency band. Alternatively, the first frequency band may be the 758-960 MHz frequency band, the second frequency band may be the 2.6 GHz frequency band, and the third frequency band may be the 1.8 GHz frequency band. Alternatively, the first frequency band may be the 1.8 GHz frequency band, the second frequency band may be the 2.1 GHz frequency band, and the third frequency band may be the 2.6 GHz frequency band.

[0123] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of protection of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A radio frequency isolation module, characterized in that: The RF isolation module is used to transmit the target RF signal provided by the power amplifier module to the antenna; wherein the operating frequency band of the RF isolation module covers the operating frequency band of the power amplifier module, and the operating frequency band of the RF isolation module includes N frequency bands, where N is an integer greater than 1; the RF isolation module includes: a shunt circuit, an isolation circuit, and a combining circuit; the isolation circuit includes at least one isolation branch; The shunt circuit includes an input end and N output ends, wherein the input end is used to couple with the power amplification module to receive the target RF signal, and the target RF signal includes signals of S frequency bands, where S is an integer less than or equal to N; the N output ends correspond to the N frequency bands one by one, one output end is coupled to one isolation branch, and each output end is used to output the signal of the corresponding frequency band to the coupled isolation branch; the shunt circuit is used to perform shunt processing on the target RF signal, dividing it into signals of each frequency band included in the S frequency bands, and outputting them through the output end corresponding to each frequency band; Each of the isolation branches is coupled to the combining circuit, and is configured to transmit a signal provided by one of the output terminals of the coupled branch circuit to the combining circuit, and to prevent a signal generated at the combining circuit from being transmitted to an input terminal coupled to the isolation branch; The combining circuit is used to couple with the antenna, combine the signals transmitted by the isolation branches in the isolation circuit, and output the combined signals to the antenna.

2. The module according to claim 1, wherein The isolation circuit includes N isolation branches; the N isolation branches correspond one-to-one to the N output terminals; The operating frequency band of the isolation branch covers the frequency band corresponding to the output end coupled to the isolation branch.

3. The module according to claim 1, wherein The isolation circuit includes M isolation branches, where M is an integer smaller than N; wherein one of the M isolation branches is coupled to at least one of the output terminals; The operating frequency band of the isolation branch covers the frequency band corresponding to at least one of the output ends coupled to the isolation branch.

4. The module according to any one of claims 1 to 3, characterized in that: The shunt circuit includes at least one shunt.

5. The module according to any one of claims 1 to 4, characterized in that: The isolation branch includes an isolator.

6. The module according to any one of claims 1 to 4, characterized in that: The isolation branch includes a circulator.

7. The module according to any one of claims 1 to 6, characterized in that: The combining circuit includes a multi-band combiner.

8. The module according to claim 7, wherein The combining circuit includes at least one filter; the at least one isolation branch corresponds to the at least one filter on a one-to-one basis, wherein each of the isolation branches is coupled to the multi-band combiner through a corresponding filter, and the operating frequency band of each filter is the same as the operating frequency band of the coupled isolation branch.

9. A communication system, characterized in that: include: A transmitter, a power amplifier module, and a radio frequency isolation module as described in any one of claims 1 to 7; The transmitter is configured to generate a first radio frequency signal; The power amplification module is coupled to the transmitter and the radio frequency isolation module respectively, and is used to amplify the first radio frequency signal to obtain a second radio frequency signal, and output the second radio frequency signal to the radio frequency isolation module; The radio frequency isolation module is used to couple with an antenna, and the radio frequency isolation module is used to transmit the second radio frequency signal to the antenna.

10. The system according to claim 9, wherein: The power amplification module includes a power splitter, a plurality of power amplification circuits and a first combiner; The power divider is coupled to each of the power amplifier circuits, and is configured to distribute power of the first radio frequency signal and output a third radio frequency signal to each of the power amplifier circuits, wherein the total power of all the third radio frequency signals output by the power divider is the same as the power of the first radio frequency signal; Each of the power amplifier circuits is coupled to the first combiner, and is configured to amplify the power of the received third radio frequency signal and then output the amplified signal to the combiner; The combiner is coupled to the radio frequency isolation module and is used to combine the signals outputted by the plurality of power amplifier circuits to obtain the second radio frequency signal, and output the signal to the radio frequency isolation module.

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