Radio frequency system, impedance tuning method and related products

Abstract

The application provides a radio frequency system, an impedance tuning method and related products. The radio frequency system comprises a first radio frequency path, a second radio frequency path, a first power detector and a processor. The first radio frequency path comprises a first coupler and a first antenna radiator. The second radio frequency path comprises a second antenna radiator. The first power detector is electrically connected to the first coupler. The first power detector is used to obtain, through the first coupler, first coupling power received by the first antenna radiator from the second antenna radiator when the second antenna radiator transmits antenna signals. The processor is used to obtain a first voltage standing wave ratio according to the first coupling power. When the first voltage standing wave ratio is outside a preset standing wave ratio range, a first impedance control instruction is generated. The first impedance control instruction is used to make the first voltage standing wave ratio be within the preset standing wave ratio range, so as to realize antenna impedance matching tuning.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to a radio frequency system, an impedance tuning method, and related products. Background Technology

[0002] With the widespread use of electronic devices, their operating environments are becoming increasingly complex. For example, the antenna of an electronic device may be held in a hand, placed in a pocket, worn on the body, or affected by other metallic conductors. Furthermore, as the number of components within electronic devices increases, the antenna's operating environment becomes more complex, leading to antenna impedance mismatch. For instance, the signal source impedance may be 50Ω, but the antenna impedance can vary depending on the frequency band and operating conditions. When impedance mismatch exists, the RF power transmitted between the RF front-end and the antenna is reduced. For example, when a mobile phone transmits a signal, not all available power from the signal source can be transmitted to the load (antenna), which can result in significant signal loss. Large mismatches can severely affect the antenna's radiated power and overall isotropic sensitivity, thus impacting communication. Summary of the Invention

[0003] This application provides a radio frequency system, impedance tuning method, and related products that facilitate antenna impedance tuning.

[0004] In a first aspect, an embodiment of this application provides a radio frequency system, comprising:

[0005] A first radio frequency path, the first radio frequency path including a first coupler and a first antenna radiator;

[0006] The second radio frequency path includes a second antenna radiator. When the second antenna radiator transmits an antenna signal, the first antenna radiator is able to receive a coupling signal from the second antenna radiator.

[0007] A first power detector is electrically connected to the first coupler. The first power detector is used to obtain the first coupling power received by the first antenna radiator from the second antenna radiator when the second antenna radiator transmits the antenna signal via the first coupler.

[0008] The processor is configured to obtain a first voltage standing wave ratio (VSWR) based on the first coupling power; and to generate a first impedance adjustment command when the first VSWR is outside a preset VSWR range, the first impedance adjustment command being configured to bring the first VSWR within the preset VSWR range.

[0009] This application provides a radio frequency (RF) system, comprising a first RF path, a second RF path, a first power detector, and a processor. The first RF path includes a first coupler and a first antenna radiator; the second RF path includes a second antenna radiator. When the second antenna radiator transmits an antenna signal, the first antenna radiator can receive a coupled signal from the second antenna radiator. The first power detector is electrically connected to the first coupler and is used to acquire, via the first coupler, a first coupled power received by the first antenna radiator from the second antenna radiator when the second antenna radiator transmits an antenna signal. The processor is used to acquire a first voltage standing wave ratio (VSWR) based on the first coupled power; and to generate a first impedance adjustment command when the first VSWR is outside a preset VSWR range. The first impedance adjustment command is used to bring the first VSWR within the preset VSWR range, thereby achieving antenna impedance matching and tuning, and avoiding impedance misalignment.

[0010] Secondly, an electronic device provided in this application includes the radio frequency system as described in the first aspect.

[0011] Thirdly, this application provides an impedance tuning method applied to a radio frequency (RF) system. The RF system includes a first RF path, a second RF path, a first power detector, and a processor. The first RF path includes a first coupler and a first antenna radiator. The second RF path includes a second antenna radiator. When the second antenna radiator transmits an antenna signal, the first antenna radiator can receive a coupled signal from the second antenna radiator. The first power detector is electrically connected to the first coupler. The method further includes:

[0012] When the first power detector acquires the transmitted antenna signal of the second antenna radiator via the first coupler, the first coupling power received by the first antenna radiator from the second antenna radiator;

[0013] The processor obtains the first voltage standing wave ratio based on the first coupling power;

[0014] When the first voltage standing wave ratio (VSWR) is outside the preset VSWR range, the processor generates a first impedance adjustment command, which is used to bring the first voltage standing wave ratio (VSWR) within the preset VSWR range.

[0015] Fourthly, an embodiment of this application provides a communication device including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the impedance tuning method as described in the third aspect.

[0016] Fifthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the impedance tuning method as described in the third aspect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0018] Figure 1 This is a circuit diagram of an electronic device provided in an embodiment of this application;

[0019] Figure 2 This is an exploded circuit diagram of an electronic device provided in an embodiment of this application;

[0020] Figure 3 This application provides a partial circuit framework for a radio frequency system. Figure 1 ;

[0021] Figure 4 This application provides a partial circuit framework for a radio frequency system. Figure 2 ;

[0022] Figure 5 This application provides a partial circuit framework for a radio frequency system. Figure 3 ;

[0023] Figure 6 This application provides a partial circuit framework for a radio frequency system. Figure 4 ;

[0024] Figure 7 This application provides a partial circuit framework for a radio frequency system. Figure 5 ;

[0025] Figure 8 This application provides a partial circuit framework for a radio frequency system. Figure 6 ;

[0026] Figure 9 This application provides a partial circuit framework for a radio frequency system. Figure 7 ;

[0027] Figure 10 This is a circuit framework diagram of a first radio frequency path provided in an embodiment of this application;

[0028] Figure 11 This is a circuit diagram of an electronic device provided in an embodiment of this application;

[0029] Figure 12This application provides a circuit framework for a radio frequency system. Figure 8 ;

[0030] Figure 13 This application provides a circuit framework for a radio frequency system. Figure 9 ;

[0031] Figure 14 This application provides a circuit framework for a radio frequency system. Figure 10 ;

[0032] Figure 15 This application provides a circuit framework for a radio frequency system. Figure 10 one;

[0033] Figure 16 This application provides a circuit framework for a radio frequency system. Figure 10 two;

[0034] Figure 17 This application provides a circuit framework for a radio frequency system. Figure 10 three;

[0035] Figure 18 This application provides a circuit framework for a radio frequency system. Figure 10 Four;

[0036] Figure 19 This application provides a circuit framework for a radio frequency system. Figure 10 five;

[0037] Figure 20 This is a schematic diagram of the signal flow for detecting impedance matching state in the first radio frequency path provided in an embodiment of this application;

[0038] Figure 21 This is a schematic diagram of the signal flow of the first radio frequency path as a receiving antenna provided in the embodiments of this application;

[0039] Figure 22 This is a flowchart of an impedance tuning method provided in an embodiment of this application. Figure 1 ;

[0040] Figure 23 This is a flowchart of an impedance tuning method provided in an embodiment of this application. Figure 2 ;

[0041] Figure 24 This is a flowchart of step S200 in the impedance tuning method provided in the embodiments of this application;

[0042] Figure 25 This is a flowchart of step S100 in the impedance tuning method provided in the embodiments of this application;

[0043] Figure 26 This is a circuit diagram of a communication device provided in an embodiment of this application.

[0044] Explanation of icon numbers:

[0045] Electronic device 1000; Radio frequency system 100; Display screen 200; Mid-frame 300; Back cover 400; Mid-plate 310; Bezel 320; First radio frequency path 11; Second radio frequency path 12; First power detector 13; Processor 14; First coupler 111; First antenna radiator 112; Second antenna radiator 122; Second coupler 121; Second power detector 16; First switching unit 17; First impedance tuning circuit 113; First tuning switch 114; Multiple first tuning branches 115; Second impedance tuning circuit 123; Second tuning switch 124; Multiple second tuning branches 125; RF transceiver module 15; First front-end circuit 18; Second front-end circuit 19; First sub-switch 20; Third front-end circuit 21; Third RF path 22; Third antenna radiator 23; Fourth front-end circuit 24; Fourth RF path 25; Fourth antenna radiator 26; Second switching unit 27; First low-loss amplifier 181; First filter 182; Power amplifier 191; Duplexer 192; Second filter 193; Fourth filter 194; Second low-loss amplifier 195; Third filter 196; Switching module 197; Impedance matching branch 28; Third switching unit 29. Detailed Implementation

[0046] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0048] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0049] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, drones, robots, and digital cameras. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment.

[0050] Please see Figure 2 , Figure 2 This is a partially exploded view of the electronic device 1000 provided in this application embodiment. Taking a mobile phone as an example, the working environment of the radio frequency system 100 is illustrated. The electronic device 1000 includes a display screen 200, a mid-frame 300, and a back cover 400 arranged sequentially along its thickness direction. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. The frame 320 is a conductive frame, such as a metal frame. Receiving spaces are formed between the display screen 200 and the mid-plate 310, and between the mid-plate 310 and the back cover 400, to accommodate circuit boards 600, camera modules, receiver modules, batteries 700, sub-boards 800, and various sensors, etc. One side of the frame 320 along the thickness direction surrounds the edge of the display screen 200, and the other side of the frame 320 along the thickness direction surrounds the edge of the back cover 400, forming the complete external structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, while the frame 320 and the back cover 400 are separate structures. The above describes the working environment of the radio frequency system 100 using a mobile phone as an example, but the radio frequency system 100 of this application is not limited to the above working environment.

[0051] The circuit architecture of the radio frequency system 100 will be described in detail below.

[0052] Please see Figure 3 , Figure 3 This is a circuit architecture diagram of a radio frequency system 100 provided in an embodiment of this application.

[0053] Please see Figure 3The radio frequency system 100 includes a first radio frequency path 11, a second radio frequency path 12, a first power detector 13, and a processor 14.

[0054] The radio frequency system 100 may exist in forms including, but not limited to, circuits, devices, independently packaged chips, or chips integrated and packaged together with other circuits on a circuit board 600.

[0055] The first radio frequency path 11, the second radio frequency path 12, the first power detector 13, and the processor 14 are all present in forms including but not limited to circuits, devices, independently packaged chips, or chips integrated and packaged together with other circuits on the circuit board 600.

[0056] Please see Figure 3 The first radio frequency path 11 includes a first coupler 111 and a first antenna radiator 112.

[0057] One end of the first coupler 111 is electrically connected to the first antenna radiator 112, and the other end of the first coupler 111 is used to electrically connect to the radio frequency transceiver module. The first antenna radiator 112 is a port for transmitting and receiving antenna signals on an electronic device.

[0058] In this application, "electrical connection" includes, but is not limited to, direct electrical connection or indirect electrical connection.

[0059] The first coupler 111 is used for signal distribution, power distribution, signal monitoring, and phase adjustment. The first coupler 111 can proportionally split a single RF power source into several paths for signal detection or monitoring, such as power measurement and wave detection. The first coupler 111 is typically used to couple signals from one transmission line to another, achieving signal distribution and synthesis. The first coupler 111 can also be used to monitor the amplitude, phase, and other characteristics of signals to meet different communication requirements. For example, a directional coupler can separate forward and backward waves in a transmission line, determine the reflection coefficient at the measured location by measuring the reflected power at the signal input end, and thus control and measure the output power level of the RF transceiver module.

[0060] This application does not specifically limit the material of the first antenna radiator 112. Optionally, the first antenna radiator 112 may be made of a conductive material, including but not limited to conductive materials such as metals and alloys. This application does not specifically limit the shape of the first antenna radiator 112. For example, the shape of the first antenna radiator 112 may include, but is not limited to, strip-shaped, sheet-shaped, rod-shaped, coated, or thin-film-shaped. Figure 3The first antenna radiator 112 shown is merely an example and does not limit the shape of the first antenna radiator 112 provided in this application. In this embodiment, the first antenna radiator 112 is strip-shaped. This application does not limit the extension trajectory of the first antenna radiator 112. Optionally, the first antenna radiator 112 can extend along a straight line, a curve, or a bend. The first antenna radiator 112 described above can be a line of uniform width on its extension trajectory, or it can be a strip of varying width, such as one with a gradually changing width or a widened region.

[0061] This application does not specifically limit the form of the first antenna radiator 112. Optionally, the form of the first antenna radiator 112 includes, but is not limited to, a metal frame 320, a metal frame embedded in a plastic frame 320, a metal radiator located within or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser-directly formed antenna (LDS), a printed-directly formed antenna (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc. In this embodiment, the first antenna radiator 112 is taken as part of the metal frame 320 of the electronic device 1000.

[0062] Please see Figure 3 The second radio frequency path 12 includes a second radio frequency radiator 122.

[0063] Please see Figure 4 The second antenna radiator 122 is used for electrical connection to the radio frequency transceiver module 15. The second antenna radiator 122 and the first antenna radiator 112 can be electrically connected to the same radio frequency transceiver module 15 or different radio frequency transceiver modules 15.

[0064] This embodiment uses the example of the second antenna radiator 122 and the first antenna radiator 112 being connected to the same radio frequency transceiver module 15 for illustration.

[0065] The material and form of the second antenna radiator 122 can be referenced from the material and form of the first antenna radiator 112.

[0066] When the second antenna radiator 122 transmits an antenna signal, the first antenna radiator 112 is able to receive a coupling signal from the second antenna radiator 122. In other words, the first antenna radiator 112 is coupled to the second antenna radiator 122.

[0067] Optionally, the length of the first antenna radiator 112 is the same as or similar to the length of the second antenna radiator 122. In this way, the operating frequency band of the first antenna radiator 112 is the same as or similar to the operating frequency band of the second antenna radiator 122. This is beneficial because when the second antenna radiator 122 transmits antenna signals, a coupling field is formed between the second antenna radiator 122 and the first antenna radiator 112, and the first antenna radiator 112 can receive antenna signals of a certain strength.

[0068] Optionally, the operating frequency band of the first antenna radiator 112 is similar to or the same as the operating frequency band of the second antenna radiator 122. This application does not specifically limit the operating frequency band of the first antenna radiator 112. The operating frequency band of the first antenna radiator 112 includes, but is not limited to, the LB band, MB band, HB band, and UHB band for cellular mobile signals. The operating frequency band of the first antenna radiator 112 includes, but is not limited to, the GPS band and the Wi-Fi band.

[0069] The operating mode of the radio frequency transceiver module 15 includes, but is not limited to, time division duplex (TDD) or frequency division duplex (FDD).

[0070] Alternatively, the coupling between the first antenna radiator 112 and the second antenna radiator 122 can be achieved through spatial coupling or other methods.

[0071] In this embodiment, the coupling strength between the first antenna radiator 112 and the second antenna radiator 122 is greater than or equal to the first coupling strength, so that when the second antenna radiator 122 transmits an antenna signal, the first antenna radiator 112 can receive the antenna signal, thus creating conditions for detecting impedance mismatch in the first radio frequency path 11.

[0072] In other words, the isolation between the first antenna radiator 112 and the second antenna radiator 122 is less than or equal to the first isolation.

[0073] Optionally, the distance between the first antenna radiator 112 and the second antenna radiator 122 is less than or equal to a first preset distance. If the distance between the first antenna radiator 112 and the second antenna radiator 122 is too large, the first antenna radiator 112 may not be able to couple with the second antenna radiator 122, resulting in the first antenna radiator 112 being unable to receive the antenna signal when the second antenna radiator 122 transmits the antenna signal, thus failing to create conditions for detecting the impedance mismatch of the first radio frequency path 11.

[0074] In this embodiment, the coupling strength between the first antenna radiator 112 and the second antenna radiator 122 is less than or equal to the second coupling strength. If the coupling strength between the first antenna radiator 112 and the second antenna radiator 122 is too large, it may lead to excessive mutual interference. The transmitted signal of the second antenna radiator 122 may affect the received signal of the first antenna radiator 112, resulting in inaccurate signal strength reception of the first antenna radiator 112.

[0075] In other words, the isolation between the first antenna radiator 112 and the second antenna radiator 122 is greater than or equal to the second isolation.

[0076] Optionally, the distance between the first antenna radiator 112 and the second antenna radiator 122 is greater than or equal to a second preset distance. If the distance between the first antenna radiator 112 and the second antenna radiator 122 is too small, it may result in insufficient isolation between them, leading to inaccurate signal strength received by the first antenna radiator 112 when the second antenna radiator 122 transmits antenna signals.

[0077] In this embodiment, by designing the coupling strength between the first antenna radiator 112 and the second antenna radiator 122 to be greater than or equal to the first coupling strength and less than or equal to the second coupling strength, it is possible to ensure that when the second antenna radiator 122 transmits an antenna signal, the first antenna radiator 112 can receive the antenna signal, thus creating conditions for detecting impedance mismatch in the first radio frequency path 11. Furthermore, it is possible to minimize or eliminate the impact of the transmitted signal of the second antenna radiator 122 on the received signal of the first antenna radiator 112, thereby improving the working efficiency of both the first antenna radiator 112 and the second antenna radiator 122.

[0078] Optional, refer to the reference Figure 2 The first antenna radiator 112 and the second antenna radiator 122 can be disposed on the frame 320. The first antenna radiator 112 and the second antenna radiator 122 can be disposed on the same side or different sides of the frame 320.

[0079] Optionally, the first antenna radiator 112 and the second antenna radiator 122 are located on different sides to receive or transmit antenna signals from the direction.

[0080] In this embodiment, please refer to Figure 4The first power detector 13 is electrically connected to the first coupler 111. The first power detector 13 can monitor the output power of the RF transceiver module 15, ensuring it remains within a specified range. It can also adjust the transmit power by feeding the power detection results back to the processor 14, thereby optimizing signal quality and system performance. In the RF system 100, the power detector monitors signal strength, evaluates link quality, and performs necessary power control to ensure the stability and reliability of communication.

[0081] In this embodiment, please refer to Figure 4 The first power detector 13 is used to acquire the first coupling power of the antenna signal received by the first antenna radiator 112 from the second antenna radiator 122 when the second antenna radiator 122 transmits the antenna signal via the first coupler 111.

[0082] The first coupling power includes the coupling power detected by the first power detector 13 from the first antenna radiator 112 to the first coupler 111 in the direction of the first antenna radiator 112, and also includes the coupling power detected by the first power detector 13 from the first coupler 111 to the first antenna radiator 112 after reflection on the first radio frequency path 11.

[0083] Optional, please refer to Figure 4 The first power detector 13 can be a module that is independent of the radio frequency transceiver module 15.

[0084] Optional, please refer to Figure 5 The first power detector 13 can also be integrated into the radio frequency transceiver module 15.

[0085] Optionally, the first coupler 111 may include, but is not limited to, a bidirectional coupler.

[0086] Since the first antenna radiator 112 and the second antenna radiator 122 satisfy the coupling condition, when the second antenna radiator 122 acts as the transmitting antenna for the first frequency band and the first antenna radiator 112 acts as the receiving antenna, the first antenna radiator 112 can receive the signal of the first frequency band through spatial coupling. The first coupler 111 transmits the signal of the first frequency band towards the direction of the RF transceiver module 15. The first power detector 13 can monitor the power of the first frequency band transmitted by the first coupler 111, and thus obtain the first coupling power.

[0087] In this embodiment, the processor 14 is electrically connected to the first power detector 13. The processor 14 is used to receive a first coupling power from the first power detector 13, obtain a first voltage standing wave ratio (VSWR) on the first radio frequency path 11 based on the first coupling power, and generate a first impedance adjustment command when the first VSWR is outside a preset VSWR range.

[0088] The first voltage standing wave ratio (VSWR) refers to the ratio of the voltage amplitude at the antinode to the voltage amplitude at the trough of a standing wave in the transmission line (in this embodiment, the first radio frequency path 11). It is also called the standing wave coefficient or standing wave ratio. When the standing wave ratio is equal to 1, it means that the impedance of the feed line and the antenna are perfectly matched, and all high-frequency energy is radiated by the antenna without any energy reflection loss; while when the standing wave ratio is infinite, it means total reflection, and no energy is radiated at all.

[0089] This embodiment does not specifically limit the preset VSWR range. Optionally, a suitable preset VSWR range can be determined based on the efficiency of the operating frequency band. For example, a VSWR threshold X can be determined based on the efficiency of the operating frequency band, where the efficiency is -7dB (this is an example value, and this application is not limited to this efficiency value). The preset VSWR range can be 1 to X.

[0090] The processor 14 can obtain the first voltage standing wave ratio (VSWR) on the first radio frequency path 11 based on the first coupling power, and compare whether the first VSWR is within a preset VSWR range.

[0091] Optionally, the processor 14 may be a module independent of the RF transceiver module 15, including but not limited to a microcontroller unit (MCU). The processor 14 may also be integrated into the RF transceiver module 15.

[0092] When the first voltage standing wave ratio is outside the preset standing wave ratio range, it indicates that there may be an impedance mismatch. The processor 14 generates a first impedance adjustment command, which can control the impedance tuning circuit on the first radio frequency path 11 to tune the impedance on the first radio frequency path 11 until the first voltage standing wave ratio is within the preset standing wave ratio range, so that the first radio frequency path 11 has better working efficiency.

[0093] In other words, the first impedance adjustment command is used to make the first voltage standing wave ratio (VSWR) within the preset VSWR range.

[0094] The above describes how the first voltage standing wave ratio (VSWR) of the first radio frequency (RF) path 11 is determined by detecting the coupling signal received on the first RF path 11 from the second antenna radiator 122, and whether the impedance of the first RF path 11 needs tuning. Alternatively, in other embodiments, the second VSWR of the second RF path 12 can be determined by detecting the coupling signal received on the second RF path 12 from the first antenna radiator 112, and whether the impedance of the second RF path 12 needs tuning.

[0095] The two radio frequency paths (first radio frequency path 11 and second radio frequency path 12) mentioned above are merely examples. In other embodiments, the inventive concept of this application can also be applied to three radio frequency paths, four radio frequency paths, etc.

[0096] This application provides a radio frequency (RF) system 100, which includes a first RF path 11, a second RF path 12, a first power detector 13, and a processor 14. The first RF path 11 includes a first coupler 111 and a first antenna radiator 112. The second RF path 12 includes a second antenna radiator 122. When the second antenna radiator 122 transmits an antenna signal, the first antenna radiator 112 can receive a coupled signal from the second antenna radiator 122. The first power detector 13 is electrically connected to the first coupler 111 and is used to acquire, via the first coupler 111, a first coupled power received by the first antenna radiator 122 from the second antenna radiator 122 when the second antenna radiator 122 transmits an antenna signal. The processor 14 is used to acquire a first voltage standing wave ratio (VSWR) based on the first coupled power and generate a first impedance adjustment command when the first VSWR is outside a preset VSWR range. The first impedance adjustment command is used to bring the first VSWR within the preset VSWR range, thereby achieving antenna impedance matching and avoiding impedance misalignment.

[0097] Optional, please refer to Figure 6 The second radio frequency path 12 also includes a second coupler 121. The radio frequency system 100 also includes a second power detector 16.

[0098] The second coupler 121 and the second power detector 16 can be, but are not limited to, circuits, devices, independently packaged chips, or chips integrated and packaged together with other circuits on the circuit board 600.

[0099] Please see Figure 6 The second coupler 121 is electrically connected to the second antenna radiator 122. The first end of the second coupler 121 is electrically connected to the radio frequency transceiver module 15, and the second end of the second coupler 121 is electrically connected to the second antenna radiator 122. The circuit structure of the second coupler 121 can be referenced from the circuit structure of the first coupler 111.

[0100] Please see Figure 6 The second power detector 16 is electrically connected to the second coupler 121. The second power detector 16 is also electrically connected to the third terminal of the second coupler 121.

[0101] The second power detector 16 and the first power detector 13 can be the same power detector or two power detectors. When the second power detector 16 and the first power detector 13 are two power detectors, the second power detector 16 can refer to the first power detector 13.

[0102] The second power detector 16 is used to acquire, via the second coupler 121, the second coupling power of the antenna signal received by the second antenna radiator 122 from the first antenna radiator 112 when the first antenna radiator 112 transmits the antenna signal.

[0103] Of course, the second power detector 16 can detect whether the impedance of the second RF path 12 is mismatched, so as to facilitate subsequent adjustment of the impedance of the second RF path 12. Furthermore, the second power detector 16 can detect the magnitude of the transmit and receive power on the second RF path 12, thus giving the second power detector 16 multiple uses.

[0104] The second coupling power includes the coupling power detected by the second power detector 16 from the second antenna radiator 122 to the second coupler 121, and also includes the coupling power detected by the second power detector 16 from the second coupler 121 to the second antenna radiator 122 after reflection on the second radio frequency path 12.

[0105] Specifically, since the first antenna radiator 112 and the second antenna radiator 122 satisfy the coupling condition, when the first antenna radiator 112 acts as the transmitting antenna for the first frequency band and the second antenna radiator 122 acts as the receiving antenna, the second antenna radiator 122 can receive the signal of the first frequency band through spatial coupling. The second coupler 121 transmits the signal of the first frequency band towards the direction of the RF transceiver module 15. The second power detector 16 can monitor the power of the first frequency band transmitted by the second coupler 121, and thus obtain the second coupling power of the antenna signal of the first frequency band.

[0106] In this embodiment, please refer to Figure 6 The processor 14 is electrically connected to the second power detector 16. The processor 14 is used to receive a second coupling power from the second power detector 16, obtain a second voltage standing wave ratio (VSWR) on the second radio frequency path 12 according to the second coupling power, and generate a second impedance adjustment command when the second VSWR is outside a preset VSWR range.

[0107] The processor 14 can obtain the second voltage standing wave ratio on the second radio frequency path 12 based on the second coupling power, and compare whether the second voltage standing wave ratio is within the preset standing wave ratio range.

[0108] When the second voltage standing wave ratio is outside the preset standing wave ratio range, it indicates that there may be an impedance mismatch. The processor 14 generates a second impedance adjustment command, which can control the impedance tuning circuit on the second radio frequency path 12 to tune the impedance on the second radio frequency path 12 until the second voltage standing wave ratio is within the preset standing wave ratio range, so that the second radio frequency path 12 has better working efficiency.

[0109] In other words, the second impedance adjustment command is used to make the second voltage standing wave ratio (VSWR) within the preset VSWR range.

[0110] In this embodiment, the first radio frequency path 11 can receive antenna signals from the second antenna radiator 122 via spatial coupling to detect impedance mismatch on the first radio frequency path 11. Furthermore, the second radio frequency path 12 can also receive antenna signals from the first antenna radiator 112 via spatial coupling to detect impedance mismatch on the second radio frequency path 12, thereby facilitating impedance matching monitoring on the first radio frequency path 11 and the second radio frequency path 12 and improving the efficiency of the operating frequency band.

[0111] Optional, please refer to Figure 7 The radio frequency system 100 also includes a first switching unit 17.

[0112] The first side of the first switching unit 17 is electrically connected to the first power detector 13 and the second power detector 16, respectively. The other side of the first switching unit 17 is electrically connected to the first coupler 111 and the second coupler 121, respectively.

[0113] Optionally, the first switching unit 17 includes a first terminal, a second terminal, a third terminal, and a fourth terminal, wherein the first terminal and the second terminal can be signal input terminals, and the third terminal and the fourth terminal can be signal output terminals.

[0114] Specifically, the first terminal of the first switching unit 17 is electrically connected to the first coupler 111, and the second terminal of the first switching unit 17 is electrically connected to the second coupler 121. The third terminal of the first switching unit 17 is electrically connected to the first power detector 13, and the fourth terminal of the first switching unit 17 is electrically connected to the second power detector 16.

[0115] When the first radio frequency path 11 performs impedance mismatch detection, the first terminal of the first switching unit 17 is connected to the third terminal, the first coupler 111 is connected to the first power detector 13, and the first power detector 13 detects the first coupling power of the antenna signal emitted by the second antenna radiator 122 received on the first radio frequency path 11 through the first coupler 111.

[0116] Alternatively, the second terminal of the first switching unit 17 is connected to the fourth terminal, and the second coupler 121 is connected to the second power detector 16. At this time, the second power detector 16 can monitor the transmit power on the second radio frequency path 12, etc.

[0117] Alternatively, the second terminal of the first switching unit 17 is connected to the fourth terminal, and the second coupler 121 is connected to the second power detector 16. At this time, the second power detector 16 can monitor whether the impedance on the second radio frequency path 12 is mismatched, etc.

[0118] In one alternative implementation, please refer to Figure 8 The first power detector 13 and the second power detector 16 are the same power detector, referred to as the first power detector 13.

[0119] That is, the third and fourth terminals of the aforementioned first switch unit 17 are the same terminal, referred to as the third terminal.

[0120] When the first radio frequency path 11 performs impedance mismatch detection, the first terminal of the first switching unit 17 is connected to the third terminal, the first coupler 111 is connected to the first power detector 13, and the first power detector 13 detects the first coupling power of the antenna signal emitted by the second antenna radiator 122 received on the first radio frequency path 11 through the first coupler 111.

[0121] When the second RF path 12 performs impedance mismatch detection, the second and third terminals of the first switching unit 17 are connected, the second coupler 121 is connected to the first power detector 13, and the first power detector 13 detects the second coupling power of the antenna signal emitted by the first antenna radiator 112 received on the second RF path 12 via the second coupler 121.

[0122] In this embodiment, by setting a power detector and a first switching unit 17, the power detector can monitor whether the impedance on the first RF path 11 is mismatched or whether the impedance on the second RF path 12 is mismatched through the first switching unit 17 in a time-division manner, thereby reducing the number of devices, realizing whether the impedance on the first RF path 11 and the second RF path 12 is mismatched, reducing cost and area occupied.

[0123] Optional, please refer to Figure 9 The first radio frequency path 11 also includes a first impedance tuning circuit 113.

[0124] Please see Figure 9 The first impedance tuning circuit 113 is electrically connected between the first antenna radiator 112 and the first coupler 111. Optionally, the first impedance tuning circuit 113 may be connected in series or in parallel between the first antenna radiator 112 and the first coupler 111.

[0125] The first impedance tuning circuit 113 is used to receive the first impedance adjustment command. Optionally, the processor 14 is electrically connected to the first impedance tuning circuit 113, and the first impedance tuning circuit 113 is used to receive the first impedance adjustment command from the processor 14.

[0126] The first impedance adjustment command is used to tune the impedance of the first impedance tuning circuit 113 so that the first voltage standing wave ratio is within the preset standing wave ratio range, thereby matching the impedance of the first radio frequency path 11 with the impedance of the first antenna radiator 112, thereby improving the efficiency of the operating frequency band of the first radio frequency path 11.

[0127] Optional, please refer to Figure 10 The first impedance tuning circuit 113 includes a first tuning switch 114 and a plurality of first tuning branches 115.

[0128] Optionally, one end of the first tuning switch 114 is electrically connected to the first antenna radiator 112. Further, one end of the first tuning switch 114 is electrically connected between the first antenna radiator 112 and the first coupler 111. Of course, in other embodiments, one end of the first tuning switch 114 may also be electrically connected to a radiating branch of the first antenna radiator 112.

[0129] Multiple first tuning branches 115 are electrically connected to multiple selection terminals of the first tuning switch 114. Each first tuning branch 115 has one end electrically connected to one selection terminal of the first tuning switch 114, and the other end of the first tuning branch 115 can be grounded or electrically connected between the first antenna radiator 112 and the first coupler 111.

[0130] The first tuning branch 115 includes, but is not limited to, inductors and capacitors. The number of inductors and capacitors on each first tuning branch 115 is not limited.

[0131] In other embodiments, there can be multiple first tuning switches 114. Multiple first tuning switches 114, multiple inductors, and multiple capacitors can form different first impedance tuning circuits 113 to perform different impedance tuning on the first radio frequency path 11 under different impedance mismatch conditions.

[0132] Please see Figure 9 The second radio frequency path 12 also includes a second impedance tuning circuit 123.

[0133] The second impedance tuning circuit 123 is electrically connected between the second antenna radiator 122 and the second coupler 121. Optionally, the second impedance tuning circuit 123 may be connected in series or in parallel between the second antenna radiator 122 and the second coupler 121.

[0134] The second impedance tuning circuit 123 is used to receive the second impedance adjustment command. Optionally, the processor 14 is electrically connected to the second impedance tuning circuit 123, and the second impedance tuning circuit 123 is used to receive the second impedance adjustment command from the processor 14.

[0135] The second impedance adjustment command is used to tune the impedance of the second impedance tuning circuit 123 so that the second voltage standing wave ratio is within the preset standing wave ratio range, thereby matching the impedance of the second radio frequency path 12 with the impedance of the second antenna radiator 122, thereby improving the efficiency of the operating frequency band of the second radio frequency path 12.

[0136] Optional, please refer to Figure 11 The second impedance tuning circuit 123 includes a second tuning switch 124 and a plurality of second tuning branches 125.

[0137] Optionally, one end of the second tuning switch 124 is electrically connected to the second antenna radiator 122. Further, one end of the second tuning switch 124 is electrically connected between the second antenna radiator 122 and the second coupler 121. Of course, in other embodiments, one end of the second tuning switch 124 may also be electrically connected to a radiating branch of the second antenna radiator 122.

[0138] Multiple second tuning branches 125 are electrically connected to multiple selection terminals of the second tuning switch 124. Each second tuning branch 125 has one end electrically connected to one selection terminal of the second tuning switch 124, and the other end of the second tuning branch 125 can be grounded or electrically connected between the second antenna radiator 122 and the second coupler 121.

[0139] The second tuning branch 125 includes, but is not limited to, inductors and capacitors. The number of inductors and capacitors on each second tuning branch 125 is not limited.

[0140] In other embodiments, there can be multiple second tuning switches 124. Multiple second tuning switches 124, multiple inductors, and multiple capacitors can form different second impedance tuning circuits 123 to perform different impedance tuning on the second radio frequency path 12 under different impedance mismatch conditions.

[0141] Please see Figure 12The radio frequency system 100 also includes a radio frequency transceiver module 15, a first front-end circuit 18, and a second front-end circuit 19.

[0142] The radio frequency transceiver module 15 is used to transmit and receive antenna signals.

[0143] One end of the first front-end circuit 18 is electrically connected to the radio frequency transceiver module 15, and the other end of the first front-end circuit 18 is electrically connected to the first coupler 111.

[0144] One end of the second front-end circuit 19 is electrically connected to the radio frequency transceiver module 15, and the other end of the second front-end circuit 19 is electrically connected to the second coupler 121.

[0145] Optionally, the first front-end circuit 18 and the second front-end circuit 19 are electrically connected to different ports of the RF transceiver module 15.

[0146] In this embodiment, the second front-end circuit 19 includes a transmitting path and a receiving path, and the first front-end circuit 18 includes a receiving path.

[0147] In other embodiments, the second front-end circuit 19 includes a receiving path, and the first front-end circuit 18 includes a transmitting path and a receiving path. In other embodiments, the first front-end circuit 18 includes a transmitting path and a receiving path, and the second front-end circuit 19 includes a transmitting path and a receiving path.

[0148] For details, please refer to Figure 13 The radio frequency transceiver module 15 includes a first port, a second port, and a third port. The radio frequency system 100 also includes a first sub-switch 20.

[0149] The transmitting path of the second front-end circuit 19 is electrically connected to the first port, and the other end of the transmitting path of the second front-end circuit 19 is electrically connected to the first terminal of the first sub-switch 20. The receiving path of the second front-end circuit 19 is electrically connected to the second port, and the receiving path of the second front-end circuit 19 is electrically connected to the second terminal of the first sub-switch 20. The third terminal of the first sub-switch 20 is electrically connected to the second coupler 121.

[0150] The first terminal of the first sub-switch 20 is switched to be connected to the third terminal of the first sub-switch 20, and the transmitting path of the second front-end circuit 19 is turned on; the second terminal of the first sub-switch 20 is switched to be connected to the third terminal of the first sub-switch 20, and the receiving path of the second front-end circuit 19 is turned on.

[0151] In this embodiment, the first front-end circuit 18 and the second front-end circuit 19 include one transmit path and two receive paths, which can form a 2*2 MIMO antenna group, thereby increasing throughput, increasing download speed, etc.

[0152] For other implementations, please refer to Figure 14 The radio frequency system 100 also includes a third front-end circuit 21, a third radio frequency path 22, and a third antenna radiator 23. The third front-end circuit 21 includes a receiving channel. The radio frequency transceiver module 15, the third front-end circuit 21, the third radio frequency path 22, and the third antenna radiator 23 are connected in sequence to form one transmitting path and three receiving paths.

[0153] For other implementations, please refer to Figure 14 The radio frequency system 100 also includes a fourth front-end circuit 24, a fourth radio frequency path 25, and a fourth antenna radiator 26. The fourth front-end circuit 24 includes a receiving channel. The radio frequency transceiver module 15, the fourth front-end circuit 24, the fourth radio frequency path 25, and the fourth antenna radiator 26 are connected in sequence to form one transmitting path and four receiving paths, which can form a 4*4 MIMO antenna group, thereby increasing throughput and download speed.

[0154] Optional, please refer to Figure 15 The radio frequency system 100 also includes a second switching unit 27.

[0155] The first side of the second switching unit 27 can be optionally connected to the first front-end circuit 18 and the second front-end circuit 19. The second side of the second switching unit 27 can be optionally connected to the first radio frequency path 11 and the second radio frequency path 12.

[0156] Optionally, the second switching unit 27 may include, but is not limited to, a two-input, two-output switch. The second switching unit 27 may be switched to enable the first front-end circuit 18 and the first radio frequency path 11; or, the second switching unit 27 may be switched to enable the second front-end circuit 19 and the second radio frequency path 12; or, the second switching unit 27 may be switched to enable the second front-end circuit 19 and the first radio frequency path 11.

[0157] Optionally, the second switching unit 27 can be switched so that the first front-end circuit 18 is connected to the first radio frequency path 11 and the second front-end circuit 19 is connected to the second radio frequency path 12; or, the second switching unit 27 can be switched so that the first front-end circuit 18 is connected to the second radio frequency path 12 and the second front-end circuit 19 is connected to the first radio frequency path 11.

[0158] Thus, the first antenna radiator 112 can function as either a transceiver antenna or a receiving antenna. The second antenna radiator 122 can also function as either a transceiver antenna or a receiving antenna. Since the first antenna radiator 112 and the second antenna radiator 122 are located in different positions within the electronic device, the second switching unit 27 can switch between transmitting signals to different antenna radiators or receiving signals to different antenna radiators to ensure signal strength and communication quality.

[0159] When the second switching unit 27 switches to the first front-end circuit 18 and the first radio frequency path 11 to be connected, and the second switching unit 27 switches to the second front-end circuit 19 and the second radio frequency path 12 to be connected, the second antenna radiator 122 can transmit antenna signals. The impedance mismatch monitoring on the first radio frequency path 11 can obtain the coupling signal received on the first radio frequency path 11 from the second antenna radiator 122 through the first coupler 111.

[0160] When the second switching unit 27 switches to the first front-end circuit 18 and the second radio frequency path 12 to be connected, and the second switching unit 27 switches to the second front-end circuit 19 and the first radio frequency path 11 to be connected, the first antenna radiator 112 can transmit antenna signals. The impedance mismatch monitoring on the second radio frequency path 12 can obtain the coupling signal received from the first antenna radiator 112 on the second radio frequency path 12 through the second coupler 121.

[0161] Please see Figure 16 The RF system 100 also includes embodiments such as a third front-end circuit 21, a third RF path 22 and a third antenna radiator 23, a fourth front-end circuit 24, a fourth RF path 25 and a fourth antenna radiator 26. The second switching unit 27 includes, but is not limited to, a four-input four-output switch. The second switching unit 27 can be switched to enable any one of the first front-end circuit 18 and the first RF path 11 to the fourth RF path 25. The second switching unit 27 can be switched to enable any one of the second front-end circuit 19 and the first RF path 11 to the fourth RF path 25. The second switching unit 27 can be switched to enable any one of the third front-end circuit 21 and the first RF path 11 to the fourth RF path 25. The second switching unit 27 can be switched to enable any one of the fourth front-end circuit 24 and the first RF path 11 to the fourth RF path 25.

[0162] Thus, the first antenna radiator 112 can function as either a transceiver antenna or a receiving antenna. The second antenna radiator 122 can function as either a transceiver antenna or a receiving antenna. The third antenna radiator 23 can function as either a transceiver antenna or a receiving antenna. The fourth antenna radiator 26 can function as either a transceiver antenna or a receiving antenna.

[0163] Since the first antenna radiator 112, the second antenna radiator 122, the third antenna radiator 23, and the fourth antenna radiator 26 are located in different positions of the electronic device, the second switching unit 27 can switch to transmit signals to the antenna radiators in different positions (e.g., different sides) or receive signals to the antenna radiators in different positions (e.g., different sides) to ensure signal strength and communication quality.

[0164] Optional, please refer to Figure 17 The receiving channel of the first front-end circuit 18 includes a first low-loss amplifier 181 and a first filter 182. Optionally, there may be multiple first filters 182. Further, the first front-end circuit 18 also includes a first frequency selection switch, which is electrically connected to multiple first filters 182 to select the frequency band of the received signal.

[0165] One end of the first low-loss amplifier 181 is electrically connected to the radio frequency transceiver module 15. The other end of the first low-loss amplifier 181 is electrically connected to one end of the first filter 182. The other end of the first filter 182 is electrically connected to the second switching unit 27.

[0166] When the second switching unit 27 turns on the first filter 182, the receiving channel of the first front-end circuit 18 receives the antenna signal.

[0167] Optional, please refer to Figure 17 The radio frequency system 100 transmits signals in frequency division duplex mode. The transmission channel of the second front-end circuit 19 includes a power amplifier 191, a duplexer 192, and a second filter 193.

[0168] One end of the power amplifier 191 is electrically connected to the RF transceiver module 15, and the other end of the power amplifier 191 is electrically connected to the first end of the duplexer 192. One end of the second filter 193 is electrically connected to the RF transceiver module 15. The other end of the second filter 193 is electrically connected to the second end of the duplexer 192. The third end of the duplexer 192 is electrically connected to the second switching unit 27.

[0169] When the second switching unit 27 turns on the third terminal of the duplexer 192, the transmitting channel of the second front-end circuit 19 transmits the antenna signal.

[0170] The number of second filters 193 can be multiple, and multiple second filters 193 and second frequency selection switches are used to determine the frequency band to be transmitted in multiple frequency bands.

[0171] Alternatively, please refer to Figure 18The radio frequency system 100 transmits signals in time-division duplex mode. The second front-end circuit 19 includes a power amplifier 191, a fourth filter 194, a second low-loss amplifier 195, a third filter 196, and a switching module 197. One end of the power amplifier 191 is electrically connected to the radio frequency transceiver module 15. The other end of the power amplifier 191 is electrically connected to the first end of the fourth filter 194. The second end of the fourth filter 194 is electrically connected to the first end of the switching module 197. The second end of the switching module 197 is electrically connected to the second switching unit 27. One end of the second low-loss amplifier 195 is electrically connected to the radio frequency transceiver module 15, the other end of the second low-loss amplifier 195 is electrically connected to the first end of the third filter 196, and the second end of the third filter 196 is electrically connected to the third end of the switching module 197.

[0172] When the second terminal of the switch module 197 is connected to the first terminal of the switch module 197, the transmitting channel of the second front-end circuit 19 is connected. When the third terminal of the switch module 197 is connected to the second terminal of the switch module 197, the receiving channel of the second front-end circuit 19 is connected.

[0173] Optionally, there may be multiple third filters 196. Furthermore, the second front-end circuit 19 also includes a second frequency selection switch electrically connected to multiple third filters 196 to select the frequency band of the received signal.

[0174] When the second switching unit 27 turns on the third filter 196, the receiving channel of the second front-end circuit 19 receives the antenna signal.

[0175] The number of fourth filters 194 can be multiple, and multiple fourth filters 194 and third frequency selection switches can determine the frequency band to be transmitted in multiple frequency bands.

[0176] Optional, please refer to Figure 19 The radio frequency system 100 also includes an impedance matching branch 28 and a third switching unit 29.

[0177] One end of the third switching unit 29 is electrically connected to the second switching unit 27. The first selection terminal of the third switching unit 29 is electrically connected to one end of the impedance matching branch 28, and the other end of the impedance matching branch 28 is grounded. The second selection terminal of the third switching unit 29 is electrically connected to the first front-end circuit 18. Specifically, when the first power detector 13 detects the first coupled power, it connects the first radio frequency path 11 to the impedance matching branch 28.

[0178] Impedance matching branch 28 is for an impedance-matched transmission line structure. For example, impedance matching branch 28 is a 50-ohm resistor. Impedance matching branch 28 can also be a circuit with a transmission impedance close to 50 ohms and low power reflection for the frequency band of the received antenna signal.

[0179] The third switching unit 29 is used to operate the radio frequency system 100 in frequency division duplex communication mode. Since the transmit and receive frequency bands in frequency division duplex communication mode are different bands, for example, the transmit frequency band of band B3 is 1710MHz to 1785MHz, and the receive frequency band of band B3 is 1805MHz to 1880MHz. The third filter 196 in the second front-end circuit 19 is a filter that allows the transmit frequency band of band B3 to pass through. The first filter 182 in the first front-end circuit 18 is a filter that allows the receive frequency band of band B3 (1805MHz to 1880MHz) to pass through.

[0180] Because the first RF path 11 receives the transmitted signal from the second front-end circuit 19 when detecting impedance mismatch, the signal frequency band received by the first front-end circuit 18 is the transmission frequency band of the B3 band. The first filter 182 has a certain impedance (e.g., open circuit) corresponding to the transmission frequency band of the B3 band (1710MHz~1785MHz), which may cause total reflection of the signal of the transmission frequency band of the B3 band, thus causing the first coupled power detected by the first power detector 13 to be inaccurate. In this embodiment, by designing that the third switching unit 29 conducts the impedance matching branch 28 to ground when detecting impedance mismatch of the first RF path 11, the impedance matching branch 28 has basically no reflection of the transmission frequency band of the B3 band (1710MHz~1785MHz), thereby improving the accuracy of the first coupled power detected by the first power detector 13.

[0181] Please see Figure 20 The third switching unit 29 is used to connect the second switching unit 27 and the impedance matching branch 28 when the radio frequency system 100 is operating in frequency division duplex communication mode and the first power detector 13 detects the first coupling power; thereby connecting the first radio frequency path 11 and the impedance matching branch 28 to improve the accuracy of the voltage standing wave ratio of the first radio frequency path 11.

[0182] Please see Figure 21 The third switching unit 29 is also used to connect the second switching unit 27 and the first front-end circuit 18, so that the first front-end circuit 18 receives the antenna signal, and thus the receiving channel of the first front-end circuit 18 works.

[0183] In other embodiments, the radio frequency system 100 provided in this application may not have a third switching unit 29, so that the transmitting path and the receiving path can be decoupled from each other.

[0184] Optionally, the first power detector 13 is part of the radio frequency transceiver module 15; or, the first power detector 13 and the radio frequency transceiver module 15 are two independent modules.

[0185] Further optionally, the processor 14 is part of the radio frequency transceiver module 15; or, the processor 14 and the radio frequency transceiver module 15 are two independent modules. For example, please refer to... Figure 19 Processor 14 is a subprocessor (AP) of electronic device 1000.

[0186] Alternatively, the processor 14 and the first power detector 13 may be independent modules, or integrated into a single module or chip.

[0187] During the process of processor 14 determining the first voltage standing wave ratio (VSWR), the first power detector 13 detects the first coupling power, which is the power at the location of the first power detector 13. Since there is a certain loss on the path between the first coupler 111 and the first power detector 13, and the power coupled from the first radio frequency path 11 to the first radio frequency path 11 via the first coupler 111 also has a certain loss, the target coupling power on the first radio frequency path 11 can be determined by the first coupling power, the coupling coefficient of the first coupler 111, and the circuit insertion loss between the first power detector 13 and the first coupler 111.

[0188] When the first coupling power includes the forward coupling power detected by the first power detector 13 from the first antenna radiator 112 to the first coupler 111 in the direction of the first antenna radiator 112, and also includes the backward coupling power detected by the first power detector 13 after reflection on the first radio frequency path 11 from the first coupler 111 to the first antenna radiator 112, the target coupling power includes the forward target coupling power received by the first coupler 111 from the first antenna radiator 112, and also includes the reverse target coupling power received by the first coupler 111 from the radio frequency transceiver module.

[0189] Specifically, the processor 14 is used to determine the target coupling power based on the first coupling power, the coupling coefficient of the first coupler 111, and the circuit insertion loss between the first power detector 13 and the first coupler 111, and to obtain the first voltage standing wave ratio based on the target coupling power.

[0190] The target coupling power is the power on the first RF path 11, which can more accurately reflect the impedance matching state on the first RF path 11.

[0191] Specifically, when the second antenna radiator 122 transmits the antenna signal of the first frequency band, the first antenna radiator 112 receives the antenna signal of the first frequency band through spatial coupling and transmits the antenna signal of the first frequency band to the first radio frequency path 11 (this is the forward signal). The signal reflected on the first radio frequency path 11 forms the reverse signal. The first coupler 111 can separate the forward power P10 and the reverse power P20 of the first frequency band. The forward power is the power of the antenna signal of the first frequency band from the first antenna radiator 112 to the radio frequency transceiver module 15. The reverse power is the power of the antenna signal of the first frequency band reflected on the first radio frequency path 11, and the signal direction is from the radio frequency transceiver module 15 to the first antenna radiator 112. The first power detector 13 detects the first coupling power P11 of the forward signal. The processor 14 determines the first power loss P12 on this path based on the coupling coefficient of the first coupler 111 and the circuit insertion loss between the first power detector 13 and the first coupler 111. The processor 14 obtains the forward power P10 (i.e. the forward target coupling power) on the first radio frequency path 11 based on the first coupling power P11 and the first power loss P12.

[0192] The processor 14 determines the second power loss P22 on the first RF path 11 based on the coupling coefficient of the first coupler 111 and the circuit insertion loss between the first power detector 13 and the first coupler 111. The processor 14 then obtains the forward power P20 (i.e., the reverse target coupling power) on the first RF path 11 based on the second coupling power P21 and the second power loss P22.

[0193] Processor 14 is based on the power reflection coefficient formula:

[0194] |γ|=P10 / P20 (1)

[0195] Where |γ| is the magnitude of the power reflection coefficient, P10 is the forward power, and P20 is the reverse power.

[0196] Processor 14, according to the voltage standing wave ratio formula:

[0197] Voltage standing wave ratio = (1 + |γ|) / (1 + |γ|)(2)

[0198] Wherein, the voltage standing wave ratio is the voltage standing wave ratio, and |γ| is the magnitude of the power reflection coefficient.

[0199] The processor 14 obtains the first voltage standing wave ratio on the first radio frequency path 11 according to formula (2).

[0200] Furthermore, the processor 14 compares whether the first voltage standing wave ratio (VSWR) is within a preset VSWR range. If the first VSWR is outside the preset VSWR range, it indicates that there may be an impedance mismatch. The processor 14 generates a first impedance adjustment command, which controls the impedance tuning circuit on the first RF path 11 to tune the impedance on the first RF path 11 until the first VSWR is within the preset VSWR range, so that the first RF path 11 has better operating efficiency.

[0201] This embodiment does not specifically limit the preset VSWR range. Optionally, a suitable preset VSWR range can be determined based on the efficiency of the operating frequency band. For example, a VSWR threshold X can be determined based on the efficiency of the operating frequency band, where the efficiency is -7dB (this is an example value, and this application is not limited to this efficiency value). The preset VSWR range can be 1 to X.

[0202] Similarly, the impedance matching status on the second RF path 12 is monitored in the same manner as described above.

[0203] This application does not specify the time and frequency at which the first power detector 13 detects the first coupled power.

[0204] Optionally, the first power detector 13 is used to acquire the first coupling power via the first coupler 111 within a first sub-time slot of the transmission time slot. The transmission time slot is the time period during which the second radio frequency path 12 transmits the antenna signal.

[0205] Specifically, the first power detector 13 performs detection during the time period (i.e., the transmission time slot) when the second radio frequency path 12 transmits the antenna signal. This is because when the second radio frequency path 12 transmits the antenna signal through the second antenna radiator 122, the first radio frequency path 11 can receive the antenna signal transmitted by the second antenna radiator 122 through the first antenna radiator 112. At this time, the first power detector 13 can detect the first coupling power.

[0206] Further, please refer to Figure 19 The first power detector 13 is used to acquire the first coupled power via the first coupler 111 during a first time period. At this time, the third switching unit 29 conducts the impedance matching branch 28 and the first radio frequency path 11.

[0207] The first power detector 13 is also used to receive the antenna signal via the first coupler 111 during a second time period when the receiving channel of the first front-end circuit 18 is turned on. At this time, the third switching unit 29 turns on the receiving channel of the first front-end circuit 18 and the first radio frequency path 11.

[0208] The first time period and the second time period are different time periods. The order of the first time period and the second time period is not important.

[0209] In this embodiment, during the first time period, the third switching unit 29 switches to conduct the first RF path 11 and the impedance matching branch 28 (50-ohm resistor) to facilitate impedance matching status detection of the first RF path 11. During the second time period, the third switching unit 29 switches to conduct the first RF path 11 and the receiving channel of the first front-end circuit 18 to facilitate signal reception of the first front-end circuit 18 via the first RF path 11, forming a receiving antenna. In other words, although the two operating modes of the second RF path 12 always use the first RF path 11 and the first power detector 13, they are independent of each other in time and will not affect each other.

[0210] In the implementation where the first power detector 13 acquires the first coupled power via the first coupler 111 within the first sub-time slot T11 of the transmission time slot T1, the first sub-time slot T11 is a first time period. The first sub-time slot T11 is also the time period during which the first radio frequency path 11 is not used as a receiving antenna.

[0211] For example, the first front-end circuit 18, the first radio frequency path 11, and the first antenna radiator 112 form a receiving antenna; the second front-end circuit 19, the second radio frequency path 12, and the second antenna radiator 122 form a transceiver antenna. The transmitting antenna transmits signals in the B3 frequency band (1710MHz~1785MHz), and the transmission time slot T1 includes a first sub-time slot T11 and a second sub-time slot T12. The order of the first sub-time slot T11 and the second sub-time slot T12 is not restricted.

[0212] In the first sub-time slot T11, the third switching unit 29 turns on the first radio frequency path 11 and the impedance matching branch 28. The first radio frequency path 11 receives the transmission radio frequency band (1710MHz~1785MHz) of the B3 frequency band through the first antenna radiator 112. The first power detector 13 performs impedance matching monitoring of the first radio frequency path 11 and feeds back the impedance matching monitoring result to the processor 14 for impedance tuning of the first radio frequency path 11.

[0213] In the second sub-time slot T12, the third switching unit 29 connects the first radio frequency path 11 and the first front-end circuit 18. The first radio frequency path 11 receives the receiving frequency band (1805MHz~1880MHz) of the B3 band through the first antenna radiator 112.

[0214] If the RF path is a transmitting antenna, the impedance matching state of the RF path can be monitored and fed back by sampling the transmitting antenna signal. For example, during the transmission time slot T1 when the mobile phone transmits power to the outside, the first power detection can sample the amplitude and phase information of the forward and reverse RF signal power in the second RF path 12 through the second coupler 121. Then, it is fed back to the RF transceiver module 15 for signal amplification, down-conversion, and analog-to-digital converter (A / D converter, or ADC) calculation and processing, so as to obtain the power reflection coefficient S11 at the position of the second coupler 121, that is, indirectly obtain the impedance information at this position. Then, the modem or the RF transceiver module 15 sends a command to control the second impedance tuning circuit 123 to change the internal matching network to optimize the front-end matching, and finally obtain a better impedance matching state at the position of the second coupler 121.

[0215] However, when the RF path is a receiving antenna, the first RF path 11 is connected to the first front-end circuit 18. Since the first front-end circuit 18 has no transmitting channel, there is no transmitting signal in the first RF path 11. This does not meet the condition of obtaining the impedance information at this position by sampling the amplitude and phase information of the forward and reverse RF signals of the transmitted signal. Therefore, it is impossible to complete the detection of power-related information, and thus impossible to calculate the impedance mismatch at the antenna end, thereby failing to achieve impedance tuning.

[0216] For example, in actual operation, mobile terminals support switching transmit antenna paths, which can result in either the second antenna radiator 122 or the first antenna radiator 112. When the transmit signal is transmitted through the second antenna radiator 122, the first antenna radiator 112 acts as the receiving antenna. Since there is no transmitted signal in the first antenna radiator 112, the conditions for obtaining impedance information at that location by sampling the amplitude and phase information of the forward and reverse RF power of the transmitted signal are not met. Consequently, power-related information cannot be detected, and the impedance mismatch at the antenna end cannot be calculated, thus hindering impedance tuning. Receiving antenna mismatch leads to imbalance between receiving antennas. In medium-to-strong field communication, this results in a reduced signal-to-noise ratio and degraded channel quality. Taking a mobile phone as an example, when the phone antenna is held by a hand or affected by the surrounding environment, mismatch occurs. Significant mismatch severely impacts the antenna's total radiated power and overall isotropic sensitivity, thereby affecting mobile phone communication.

[0217] This embodiment provides a radio frequency (RF) system 100 that can effectively detect and adjust the impedance matching of a receiving antenna. The RF transceiver module 15 is electrically connected to one side of a second switching unit 27 via a second front-end circuit 19 and a first front-end circuit 18. The second front-end circuit 19 includes a receiving channel, a transmitting channel, and an antenna switch. The other side of the second switching unit 27 is electrically connected to a first RF path 11 and a second RF path 12. The first RF path 11 includes a first coupler 111, a first impedance tuning circuit 113, and a first antenna radiator 112. The second RF path 12 includes a second coupler 121, a second impedance tuning circuit 123, and a second antenna radiator 122.

[0218] One end of the first power detector 13 is electrically connected to the first coupler 111 via the first switching unit 17, and the other end of the first power detector 13 is electrically connected to the second coupler 121 via the first switching unit 17. The first power detector 13 is also electrically connected to the processor 14. Both the first coupler 111 and the second coupler 121 are bidirectional couplers.

[0219] Furthermore, a third switching unit 29 is provided between the second switching unit 27 and the first front-end circuit 18. The selection terminal of the third switching unit 29 can be switched to ground between the first front-end circuit 18 and the impedance matching branch 28. The impedance matching branch 28 is a 50-ohm grounding circuit.

[0220] When the transmitter operates on one of the antennas, the receiving antenna uses spatial power coupling to measure and tune the voltage standing wave ratio mismatch.

[0221] If the transmitter operates on the second antenna radiator 122, for example, if the transmit power at the antenna port is P0 and the isolation between the first antenna radiator 112 and the second antenna radiator 112 is ISO, then the transmit signal power received by the receiving antenna, the first antenna radiator 112, is P0 - ISO. This means that when the second antenna radiator 122 transmits a signal, the first antenna radiator 112 can receive the signal transmitted by the second antenna radiator 122.

[0222] The forward and reverse power in the first RF path 11 are detected by the first coupler 111 and the first power detection circuit. The forward power P10 and reverse power P20 at the location of the first coupler 111 are calculated by back-calculating the first coupling power measured by the first power detection circuit, the known coupling coefficient of the first coupler 111, and the insertion loss of the first power detection circuit. Then, the power reflection coefficient magnitude |γ| at the location of the first coupler 111 is calculated as |γ| = P10 / P20. Thus, the first voltage standing wave ratio in the first RF path 11 can be calculated as (1+|γ|) / (1+|γ|). Then, the first voltage standing wave ratio is found to be outside the preset standing wave ratio range.

[0223] The impedance of the first impedance tuning circuit 113 is adjusted by issuing commands through the modem or RF transceiver module 15, so that the first voltage standing wave ratio (VSWR) returns to the preset VSWR range, thus completing the impedance tuning of the receiving path. It should be noted that when performing power measurements, the third switching unit 29 needs to be switched to the impedance matching branch 28 (50-ohm matching state) for measurement; otherwise, there will be significant reflection of FDD (Frequency Division Duplex) band signals, affecting the accuracy of signal measurement.

[0224] In addition, the first power detector 13 is used not only to detect the impedance matching status of the first radio frequency path 11, but also to monitor the transmission power when the second radio frequency path 12 transmits antenna signals. Therefore, in order to avoid detection conflicts of the first power detector 13, the time period during which the first power detector 13 detects the impedance matching status of the first radio frequency path 11 can avoid the time period during which the first power detector 13 monitors the transmission power when the second radio frequency path 12 transmits antenna signals.

[0225] The RF system 100 provided in this application, in addition to supporting impedance tuning of the transmit path, can also achieve impedance tuning for antenna paths used only for receiving when not in transmit mode. This will greatly improve OTA performance after mismatch caused by factors such as the receiving antenna being held by hand, and improve the user's communication experience. The RF system 100 provided in this application uses signal coupling to decouple the problem of impedance tuning needing to be bound to the transmit path, realizing impedance tuning of the receive antenna path and solving the problem of antenna performance degradation caused by impedance mismatch due to factors such as the receiving antenna being held by hand.

[0226] The first power detector 13 and the processor 14 can be independent modules from the RF transceiver module 15. In this way, the processor 14 can generate impedance tuning commands and send them to the first impedance tuning circuit 113 without relying on the RF transceiver module 15 or making structural changes to the RF transceiver module 15. It can be directly laid out on the periphery of the RF transceiver module 15, decoupling the RF transceiver module 15 and other RF control platforms.

[0227] Please see Figure 22 Embodiment 2 of this application also provides an impedance tuning method. The method is applied to the radio frequency system 100 described in any of the preceding claims.

[0228] See also Figures 3-6The radio frequency system 100 includes a first radio frequency path 11, a second radio frequency path 12, a first power detector 13, and a processor 14. The first radio frequency path 11 provided in this second embodiment can refer to the relevant content of the first radio frequency path 11 in the aforementioned first embodiment. The second radio frequency path 12 provided in this second embodiment can refer to the relevant content of the second radio frequency path 12 in the aforementioned first embodiment. The first power detector 13 provided in this second embodiment can refer to the relevant content of the first power detector 13 in the aforementioned first embodiment. The processor 14 provided in this second embodiment can refer to the relevant content of the processor 14 in the aforementioned first embodiment.

[0229] The first radio frequency path 11 includes a first coupler 111 and a first antenna radiator 112. The first coupler 111 provided in this second embodiment can be referenced from the first coupler 111 described in the first embodiment above. The first antenna radiator 112 provided in this second embodiment can be referenced from the first antenna radiator 112 described in the first embodiment above.

[0230] The second radio frequency path 12 includes a second antenna radiator 122. The second antenna radiator 122 provided in this embodiment can refer to the relevant content of the second antenna radiator 122 in the aforementioned embodiment 1.

[0231] When the second antenna radiator 122 transmits an antenna signal, the first antenna radiator 112 is able to receive a coupled signal from the second antenna radiator 122. The first power detector 13 is electrically connected to the first coupler 111. In other words,

[0232] Please see Figure 22 The method also includes, but is not limited to, the following steps.

[0233] S100: When the first power detector 13 acquires the transmitting antenna signal of the second antenna radiator 122 via the first coupler 111, the first antenna radiator 112 receives the first coupling power from the second antenna radiator 122.

[0234] Optionally, the first power detector 13 can be a module independent of the RF transceiver module 15. Alternatively, the first power detector 13 can be integrated into the RF transceiver module 15.

[0235] Optionally, the first coupler 111 may include, but is not limited to, a bidirectional coupler.

[0236] Since the first antenna radiator 112 and the second antenna radiator 122 satisfy the coupling condition, when the second antenna radiator 122 acts as the transmitting antenna for the first frequency band and the first antenna radiator 112 acts as the receiving antenna, the first antenna radiator 112 can receive the signal of the first frequency band through spatial coupling. The first coupler 111 transmits the signal of the first frequency band towards the direction of the RF transceiver module 15. The first power detector 13 can monitor the power of the first frequency band transmitted by the first coupler 111, and thus obtain the first coupling power.

[0237] S200: The processor 14 obtains the first voltage standing wave ratio based on the first coupling power.

[0238] The voltage standing wave ratio (VSWR) refers to the ratio of the voltage amplitude at the antinode to the voltage amplitude at the trough of a standing wave in a transmission line (in this embodiment, the first radio frequency path 11). It is also known as the standing wave coefficient or VSWR. When the VSWR is equal to 1, it indicates that the impedance of the feed line and the antenna are perfectly matched, and all high-frequency energy is radiated by the antenna without any energy reflection loss. When the VSWR is infinite, it indicates total reflection, and no energy is radiated at all.

[0239] The processor 14 can obtain the first voltage standing wave ratio based on the forward power and reverse power on the first radio frequency path 11 detected by the first power detector 13.

[0240] S300: The processor 14 generates a first impedance adjustment command when the first voltage standing wave ratio (VSWR) is outside a preset VSWR range. The first impedance adjustment command is used to bring the first VSWR within the preset VSWR range.

[0241] Optionally, the processor 14 may be a module independent of the RF transceiver module 15, including but not limited to a microcontroller unit (MCU). The processor 14 may also be integrated into the RF transceiver module 15.

[0242] When the first voltage standing wave ratio is outside the preset standing wave ratio range, it indicates that there may be an impedance mismatch. The processor 14 generates a first impedance adjustment command, which can control the impedance tuning circuit on the first radio frequency path 11 to tune the impedance on the first radio frequency path 11 until the first voltage standing wave ratio is within the preset standing wave ratio range, so that the first radio frequency path 11 has better working efficiency.

[0243] This application provides an impedance tuning method, the method comprising: a first power detector 13 for acquiring a first coupling power received by the first antenna radiator 122 from the second antenna radiator 122 when the first coupler 111 acquires the transmitting antenna signal of the second antenna radiator 122; a processor 14 for acquiring a first voltage standing wave ratio (VSWR) based on the first coupling power; and generating a first impedance adjustment command when the first VSWR is outside a preset VSWR range, the first impedance adjustment command being used to bring the first VSWR within the preset VSWR range, thereby achieving antenna impedance matching tuning and avoiding impedance misalignment.

[0244] Optional, please refer to them together. Figure 9 The first radio frequency path 11 further includes a first impedance tuning circuit 113. The first impedance tuning circuit 113 is electrically connected between the first antenna radiator 112 and the first coupler 111.

[0245] Please see Figure 23 Step S300: After the processor 14 generates a first impedance adjustment command when the first voltage standing wave ratio is outside a preset standing wave ratio range, the method further includes:

[0246] Step S400: The first impedance tuning circuit 113 receives the first impedance adjustment command. The first impedance adjustment command is used to tune the impedance of the first impedance tuning circuit 113 so that the first voltage standing wave ratio is within the preset standing wave ratio range.

[0247] Specifically, the first impedance tuning circuit 113 can be connected in series or in parallel between the first antenna radiator 112 and the first coupler 111. The processor 14 is electrically connected to the first impedance tuning circuit 113, which is used to receive a first impedance adjustment command from the processor 14.

[0248] The first impedance adjustment command is used to tune the impedance of the first impedance tuning circuit 113 so that the first voltage standing wave ratio is within the preset standing wave ratio range, thereby matching the impedance of the first radio frequency path 11 with the impedance of the first antenna radiator 112, thereby improving the efficiency of the operating frequency band of the first radio frequency path 11.

[0249] Optional, please refer to them together. Figure 10 The first impedance tuning circuit 113 includes a first tuning switch 114 and a plurality of first tuning branches 115.

[0250] Optionally, one end of the first tuning switch 114 is electrically connected to the first antenna radiator 112. Further, one end of the first tuning switch 114 is electrically connected between the first antenna radiator 112 and the first coupler 111. Of course, in other embodiments, one end of the first tuning switch 114 may also be electrically connected to a radiating branch of the first antenna radiator 112.

[0251] Multiple first tuning branches 115 are electrically connected to multiple selection terminals of the first tuning switch 114. Each first tuning branch 115 has one end electrically connected to one selection terminal of the first tuning switch 114, and the other end of the first tuning branch 115 can be grounded or electrically connected between the first antenna radiator 112 and the first coupler 111.

[0252] The first tuning branch 115 includes, but is not limited to, inductors and capacitors. The number of inductors and capacitors in each tuning branch is not limited.

[0253] Optionally, the processor 14 is electrically connected to the first tuning switch 114. The processor 14 sends a first impedance adjustment command to the first tuning switch 114, and the first tuning switch 114 switches the first tuning branch 115 that is connected to the first antenna radiator 112 to tune the impedance of the first impedance tuning circuit 113 so that the impedance on the first radio frequency path 11 is matched.

[0254] In other embodiments, there can be multiple first tuning switches 114. Multiple first tuning switches 114, multiple inductors, and multiple capacitors can form different first impedance tuning circuits 113 to perform different impedance tuning on the first radio frequency path 11 under different impedance mismatch conditions.

[0255] Please see Figure 24 Step S200: The processor 14 obtains the first voltage standing wave ratio based on the first coupling power, including but not limited to the following steps:

[0256] Step S210: The processor 14 determines the target coupling power based on the first coupling power, the coupling coefficient of the first coupler 111, and the circuit insertion loss between the first power detector 13 and the first coupler 111.

[0257] The first coupling power includes the coupling power of the forward wave and the coupling power of the reverse wave.

[0258] The target coupling power includes the target coupling power of the forward wave and the target coupling power of the reverse wave.

[0259] During the process of processor 14 determining the first voltage standing wave ratio (VSWR), the first power detector 13 detects the first coupling power, which is the power at the location of the first power detector 13. Since there is a certain loss on the path between the first coupler 111 and the first power detector 13, and the power coupled from the first radio frequency path 11 to the first radio frequency path 11 via the first coupler 111 also has a certain loss, the target coupling power on the first radio frequency path 11 can be determined by the first coupling power, the coupling coefficient of the first coupler 111, and the circuit insertion loss between the first power detector 13 and the first coupler 111.

[0260] The target coupling power is the power on the first RF path 11, which can more accurately reflect the impedance matching state on the first RF path 11.

[0261] Specifically, when the second antenna radiator 122 transmits the antenna signal of the first frequency band, the first antenna radiator 112 receives the antenna signal of the first frequency band through spatial coupling and transmits the antenna signal of the first frequency band to the first radio frequency path 11. The first coupler 111 can separate the forward power P10 and the reverse power P20 of the first frequency band. The forward power is the power of the antenna signal of the first frequency band from the first antenna radiator 112 to the radio frequency transceiver module 15. The reverse power is the power of the antenna signal of the first frequency band reflected on the first radio frequency path 11, and the signal direction is from the radio frequency transceiver module 15 to the first antenna radiator 112. The first power detector 13 detects the first coupling power P11 of the forward signal. The processor 14 determines the first power loss P12 on this path based on the coupling coefficient of the first coupler 111 and the circuit insertion loss between the first power detector 13 and the first coupler 111. The processor 14 obtains the forward power P10 (i.e. the target coupling power of the forward wave) on the first radio frequency path 11 based on the first coupling power P11 and the first power loss P12.

[0262] The first power detector 13 detects the first coupling power P21 of the reverse signal. The processor 14 determines the second power loss P22 on this path based on the coupling coefficient of the first coupler 111 and the circuit insertion loss between the first power detector 13 and the first coupler 111. The processor 14 obtains the forward power P20 (i.e. the target coupling power of the reverse wave) on the first radio frequency path 11 based on the first coupling power P21 and the second power loss P22.

[0263] Step S220: The processor 14 obtains the first voltage standing wave ratio based on the target coupling power.

[0264] Processor 14 is based on the power reflection coefficient formula:

[0265] |γ|=P10 / P20 (1)

[0266] Where |γ| is the magnitude of the power reflection coefficient, P10 is the forward power, and P20 is the reverse power.

[0267] Processor 14, according to the voltage standing wave ratio formula:

[0268] Voltage standing wave ratio = (1 + |γ|) / (1 + |γ|)(2)

[0269] Wherein, the voltage standing wave ratio is the voltage standing wave ratio, and |γ| is the magnitude of the power reflection coefficient.

[0270] The processor 14 obtains the first voltage standing wave ratio on the first radio frequency path 11 according to formula (2).

[0271] Furthermore, the processor 14 compares whether the first voltage standing wave ratio (VSWR) is within a preset VSWR range. If the first VSWR is outside the preset VSWR range, it indicates that there may be an impedance mismatch. The processor 14 generates a first impedance adjustment command, which controls the impedance tuning circuit on the first RF path 11 to tune the impedance on the first RF path 11 until the first VSWR is within the preset VSWR range, so that the first RF path 11 has better operating efficiency.

[0272] This embodiment does not specifically limit the preset VSWR range. Optionally, a suitable preset VSWR range can be determined based on the efficiency of the operating frequency band. For example, a VSWR threshold X can be determined based on the efficiency of the operating frequency band, where the efficiency is -7dB (this is an example value, and this application is not limited to this efficiency value). The preset VSWR range can be 1 to X.

[0273] The above describes the impedance matching monitoring and control tuning method for the first RF path 11. The impedance matching monitoring and control tuning method for the second RF path 12 can be found in the relevant content of the first RF path 11.

[0274] Optional, please refer to Figure 25 Step S100: When the first power detector 13 acquires the transmitted antenna signal of the second antenna radiator 122 via the first coupler 111, the first coupling power received by the first antenna radiator 112 from the second antenna radiator 122 includes, but is not limited to, the following steps.

[0275] Step S110: The first power detector 13 acquires the first coupled power via the first coupler 111 in the first sub-time slot T11 of the transmission time slot T1.

[0276] The transmission time slot T1 is the time period during which the second radio frequency path 12 transmits the antenna signal.

[0277] Specifically, the first power detector 13 performs detection during the time period (i.e., transmission time slot T1) when the second radio frequency path 12 transmits the antenna signal. This is because when the second radio frequency path 12 transmits the antenna signal through the second antenna radiator 122, the first radio frequency path 11 can receive the antenna signal transmitted by the second antenna radiator 122 through the first antenna radiator 112. At this time, the first power detector 13 can detect the first coupling power.

[0278] Step S120: The first power detector 13 acquires the first coupling power through the first coupler 111 during the first time period.

[0279] Please refer to the following: Figure 19 At this time, the third switching unit 29 conducts the impedance matching branch 28 and the first radio frequency path 11.

[0280] Step S130: The first power detector 13 receives the antenna signal via the first coupler 111 during the second time period. The first time period and the second time period are different time periods.

[0281] At this time, the third switching unit 29 connects the receiving channel of the first front-end circuit 18 to the first radio frequency path 11.

[0282] In this embodiment, during the first time period, the third switching unit 29 switches to conduct the first RF path 11 and the impedance matching branch 28 (50-ohm resistor) to facilitate impedance matching status detection of the first RF path 11. During the second time period, the third switching unit 29 switches to conduct the first RF path 11 and the receiving channel of the first front-end circuit 18 to facilitate signal reception of the first front-end circuit 18 via the first RF path 11, forming a receiving antenna. In other words, although the two operating modes of the second RF path 12 always use the first RF path 11 and the first power detector 13, they are independent of each other in time and will not affect each other.

[0283] In the implementation where the first power detector 13 acquires the first coupled power via the first coupler 111 within the first sub-time slot T11 of the transmission time slot T1, the first sub-time slot T11 is a first time period. The first sub-time slot T11 is also the time period during which the first radio frequency path 11 is not used as a receiving antenna.

[0284] For example, the first front-end circuit 18, the first radio frequency path 11, and the first antenna radiator 112 form a receiving antenna; the second front-end circuit 19, the second radio frequency path 12, and the second antenna radiator 122 form a transceiver antenna. The transceiver antenna transmits signals in the B3 frequency band (1710MHz~1785MHz), and the transmission time slot T1 includes the first sub-time slot T11 and the second sub-time slot T12.

[0285] In the first sub-time slot T11, the third switching unit 29 turns on the first radio frequency path 11 and the impedance matching branch 28. The first radio frequency path 11 receives the transmission radio frequency band (1710MHz~1785MHz) of the B3 frequency band through the first antenna radiator 112. The first power detector 13 performs impedance matching monitoring of the first radio frequency path 11 and feeds back the impedance matching monitoring result to the processor 14 for impedance tuning of the first radio frequency path 11.

[0286] In the second sub-time slot T12, the third switching unit 29 connects the first radio frequency path 11 and the first front-end circuit 18. The first radio frequency path 11 receives the receiving frequency band (1805MHz~1880MHz) of the B3 band through the first antenna radiator 112.

[0287] Please see Figure 26 This application also provides a communication device 2000 in embodiment three, which includes a processor 14 and a memory 30. The communication device 2000 may be the electronic device 1000 of the aforementioned embodiment one. The processor 14 and the memory 30 are coupled. The memory 30 is used to store a computer program. When the computer program is executed by the processor 14, the communication device 2000 performs the impedance tuning method described in any of the aforementioned embodiments. The processor 14 may be an application processor (AP) or a baseband processor (BP).

[0288] The following description uses a communication device 2000 as an example to illustrate the embodiments. It should be understood that... Figure 26 The communication device 2000 shown is merely an example, and the communication device 2000 can have more than Figure 26 The more or fewer components shown can be combined into two or more components, or they can have different component configurations. Figure 26 The various components shown can be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application-specific integrated circuits.

[0289] The communication device 2000 may include, but is not limited to, the following steps: a processor 14, an external memory interface, an internal memory 30, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, an antenna, a mobile communication module, a wireless communication module, an audio module, a speaker, a receiver, a microphone, a headphone jack, a sensor module, buttons, a motor, an indicator, a camera, a display screen, and a subscriber identification module (SIM) card interface, etc. The sensor module includes, but is not limited to, at least one of the following: a pressure sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer, a distance sensor, a proximity sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, and a bone conduction sensor.

[0290] Embodiment 4 of this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by the processor 14, the processor 14 performs the method described in any of the embodiments.

[0291] It is understood that the aforementioned communication device 2000, etc., includes hardware structures and / or software modules corresponding to the execution of each function in order to achieve the above-mentioned functions. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this invention.

[0292] This application embodiment can divide the above-mentioned communication device 2000 and the like into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The following description uses the division of each function into separate functional modules as an example:

[0293] The methods provided in this application can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented in software, they can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a communication device 2000, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., SSDs), etc.

[0294] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0295] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. A radio frequency system, characterized in that, include: A first radio frequency path, the first radio frequency path including a first coupler and a first antenna radiator; The second radio frequency path includes a second antenna radiator. When the second antenna radiator transmits an antenna signal, the first antenna radiator is able to receive a coupling signal from the second antenna radiator. A first power detector is electrically connected to the first coupler. The first power detector is used to obtain the first coupling power received by the first antenna radiator from the second antenna radiator when the second antenna radiator transmits the antenna signal via the first coupler. A processor electrically connected to the first power detector, the processor being configured to obtain a first voltage standing wave ratio based on the first coupling power; When the first voltage standing wave ratio is outside the preset standing wave ratio range, a first impedance adjustment command is generated, the first impedance adjustment command being used to bring the first voltage standing wave ratio within the preset standing wave ratio range.

2. The radio frequency system as described in claim 1, characterized in that, The second radio frequency path further includes a second coupler, and the radio frequency system further includes a second power detector. The second coupler is electrically connected to the second antenna radiator, and the second power detector is electrically connected to the second coupler. The second power detector is used to obtain, via the second coupler, a second coupling power received by the second antenna radiator from the first antenna radiator when the first antenna radiator transmits an antenna signal. The processor is used to obtain a second voltage standing wave ratio based on the second coupling power; When the second voltage standing wave ratio is outside the preset standing wave ratio range, a second impedance adjustment command is generated, which is used to bring the second voltage standing wave ratio within the preset standing wave ratio range.

3. The radio frequency system as described in claim 2, characterized in that, The radio frequency system further includes a first switching unit, a first side of which is electrically connected to the first power detector and the second power detector, and the other side of which is electrically connected to the first coupler and the second coupler.

4. The radio frequency system as described in claim 3, characterized in that, The first power detector and the second power detector are the same power detector.

5. The radio frequency system as described in claim 2, characterized in that, The first radio frequency path further includes a first impedance tuning circuit, which is electrically connected between the first antenna radiator and the first coupler. The first impedance tuning circuit is used to receive the first impedance adjustment command, which is used to tune the impedance of the first impedance tuning circuit so that the first voltage standing wave ratio is within the preset standing wave ratio range.

6. The radio frequency system as described in claim 5, characterized in that, The first impedance tuning circuit includes a first tuning switch and a plurality of first tuning branches. One end of the first tuning switch is electrically connected to the first antenna radiator, and the plurality of first tuning branches are respectively electrically connected to a plurality of selection terminals of the first tuning switch.

7. The radio frequency system as described in claim 2, characterized in that, The second radio frequency path further includes a second impedance tuning circuit, which is electrically connected between the second antenna radiator and the second coupler. The second impedance tuning circuit is used to receive the second impedance adjustment command, which is used to tune the impedance of the second impedance tuning circuit so that the second voltage standing wave ratio is within the preset standing wave ratio range.

8. The radio frequency system according to any one of claims 2 to 7, characterized in that, The radio frequency system also includes: A radio frequency transceiver module, wherein the radio frequency transceiver module is used to transmit and receive antenna signals; A first front-end circuit, one end of which is electrically connected to the radio frequency transceiver module, and the other end of which is electrically connected to the first coupler. The second front-end circuit has one end electrically connected to the radio frequency transceiver module and the other end electrically connected to the second coupler.

9. The radio frequency system as described in claim 8, characterized in that, The radio frequency system further includes a second switching unit. The first side of the second switching unit can be selectively grounded to the first front-end circuit and the second front-end circuit, and the second side of the second switching unit can be selectively grounded to the first radio frequency path and the second radio frequency path.

10. The radio frequency system as described in claim 9, characterized in that, The receiving channel of the first front-end circuit includes a first low-loss amplifier and a first filter. One end of the first low-loss amplifier is electrically connected to the radio frequency transceiver module, and the other end of the first low-loss amplifier is electrically connected to one end of the first filter. The other end of the first filter is electrically connected to the second switching unit. The transmitting channel of the second front-end circuit includes a power amplifier, a duplexer, and a second filter. One end of the power amplifier is electrically connected to the radio frequency transceiver module, and the other end of the power amplifier is electrically connected to the first end of the duplexer. One end of the second filter is electrically connected to the radio frequency transceiver module, and the other end of the second filter is electrically connected to the second end of the duplexer. The third end of the duplexer is electrically connected to the second switching unit. or, The second front-end circuit includes a power amplifier, a fourth filter, a second low-loss amplifier, a third filter, and a switching module. One end of the power amplifier is electrically connected to the radio frequency transceiver module, and the other end of the power amplifier is electrically connected to the first end of the fourth filter. The second end of the fourth filter is electrically connected to the first end of the switching module, and the second end of the switching module is electrically connected to the second switching unit. One end of the second low-loss amplifier is electrically connected to the RF transceiver module, the other end of the second low-loss amplifier is electrically connected to the first end of the third filter, the second end of the third filter is electrically connected to the third end of the switching module, and the third end of the switching module is electrically connected to the second switching unit.

11. The radio frequency system as described in claim 9, characterized in that, The radio frequency system further includes an impedance matching branch and a third switching unit. One end of the third switching unit is electrically connected to the second switching unit, the first selection terminal of the third switching unit is electrically connected to one end of the impedance matching branch, the other end of the impedance matching branch is grounded, and the second selection terminal of the third switching unit is electrically connected to the first front-end circuit. The third switching unit is used to turn on the second switching unit and the impedance matching branch when the radio frequency system is operating in frequency division duplex communication mode and the first power detector detects the first coupled power. The third switching unit is also used to connect the second switching unit to the first front-end circuit, so that the first front-end circuit receives the antenna signal.

12. The radio frequency system as described in claim 8, characterized in that, The first power detector is part of the radio frequency transceiver module; or, the first power detector and the radio frequency transceiver module are two independent modules.

13. The radio frequency system according to any one of claims 1 to 7, 9 to 11, characterized in that, The processor is used to determine the target coupling power based on the first coupling power, the coupling coefficient of the first coupler, and the circuit insertion loss between the first power detector and the first coupler. The first voltage standing wave ratio is obtained based on the target coupling power.

14. The radio frequency system according to any one of claims 1 to 7, 9 to 11, characterized in that, The first power detector is used to acquire the first coupling power via the first coupler in the first sub-time slot of the transmission time slot; The first power detector is also used to acquire the power of the first radio frequency path via the first coupler in the second sub-time slot of the transmission time slot, wherein the transmission time slot is the time period during which the second radio frequency path transmits antenna signals.

15. The radio frequency system as described in claim 8, characterized in that, The first power detector is used to acquire the first coupling power through the first coupler in a first time period; the first power detector is also used to receive the antenna signal through the first coupler in a second time period when the receiving channel of the first front-end circuit is turned on, wherein the first time period and the second time period are different time periods.

16. An electronic device, characterized in that, Includes the radio frequency system as described in any one of claims 1 to 15.

17. An impedance tuning method, characterized in that, The method is applied to a radio frequency system, which includes a first radio frequency path, a second radio frequency path, a first power detector, and a processor. The first radio frequency path includes a first coupler and a first antenna radiator. The second radio frequency path includes a second antenna radiator. When the second antenna radiator transmits an antenna signal, the first antenna radiator can receive a coupled signal from the second antenna radiator. The first power detector is electrically connected to the first coupler. The method further includes: When the first power detector acquires the transmitted antenna signal of the second antenna radiator via the first coupler, the first coupling power received by the first antenna radiator from the second antenna radiator; The processor obtains the first voltage standing wave ratio based on the first coupling power; When the first voltage standing wave ratio (VSWR) is outside the preset VSWR range, the processor generates a first impedance adjustment command, which is used to bring the first voltage standing wave ratio (VSWR) within the preset VSWR range.

18. The method as described in claim 17, characterized in that, The first radio frequency path further includes a first impedance tuning circuit, which is electrically connected between the first antenna radiator and the first coupler. After the processor generates the first impedance adjustment command when the first voltage standing wave ratio is outside the preset standing wave ratio range, it further includes: The first impedance tuning circuit receives the first impedance adjustment command, which is used to tune the impedance of the first impedance tuning circuit so that the first voltage standing wave ratio is within the preset standing wave ratio range.

19. The method as described in claim 17, characterized in that, The processor obtains the first voltage standing wave ratio (VSWR) based on the first coupling power, including: The processor determines the target coupling power based on the first coupling power, the coupling coefficient of the first coupler, and the circuit insertion loss between the first power detector and the first coupler. The processor obtains a first voltage standing wave ratio based on the target coupling power.

20. The method as described in claim 17, characterized in that, When the first power detector acquires the transmitting antenna signal of the second antenna radiator via the first coupler, the first coupling power received by the first antenna radiator from the second antenna radiator includes: The first power detector acquires the first coupled power via the first coupler in the first sub-time slot of the transmission time slot; The first power detector acquires the power of the first radio frequency path via the first coupler in the second sub-time slot of the transmission time slot, where the transmission time slot is the time period during which the second radio frequency path transmits antenna signals.

21. The method as described in claim 17, characterized in that, The method further includes: The first power detector acquires the first coupling power via the first coupler during a first time period; The first power detector receives the antenna signal via the first coupler during a second time period, and the first time period and the second time period are different time periods.

22. A communication device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the impedance tuning method as described in any one of claims 17 to 21.

23. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the impedance tuning method as described in any one of claims 17 to 21.

Images