Radio frequency circuit and communication device

Abstract

The application discloses a radio frequency circuit and a communication device, relates to the field of communication, and is used for reducing the hardware cost of a communication device supporting multiple transmitting channels. The radio frequency circuit comprises a first analog phase-shifting circuit and a second analog phase-shifting circuit. The first analog phase-shifting circuit receives a first radio frequency signal and outputs a third radio frequency signal and a fourth radio frequency signal. The first analog phase-shifting circuit outputs the third radio frequency signal and the fourth radio frequency signal after analog phase-shifting at least one of the third radio frequency signal and the fourth radio frequency signal. The second analog phase-shifting circuit receives a second radio frequency signal and outputs a fifth radio frequency signal and a sixth radio frequency signal. The second analog phase-shifting circuit outputs the fifth radio frequency signal and the sixth radio frequency signal after analog phase-shifting at least one of the fifth radio frequency signal and the sixth radio frequency signal. The first radio frequency signal and the second radio frequency signal are different in phase.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, in particular to a radio frequency circuit and a communication device. BACKGROUND

[0002] Currently, a communication device supporting the fifth generation (5G) communication supports multiple uplink transmission channels to realize beamforming (BF) to compensate for the phase difference of the air interface channel of multiple antennas, thereby obtaining beamforming combining gain, improving the uplink signal receiving strength and signal-to-noise ratio, and further improving the signal quality and transmission rate.

[0003] However, the hardware cost and volume of the current communication device supporting multiple transmission channels are high, for example, four transmission channels are needed to support four radio frequency signals. SUMMARY

[0004] Embodiments of the present application provide a radio frequency circuit and a communication device for reducing the hardware cost of a communication device supporting multiple transmission channels.

[0005] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a radio frequency circuit is provided, comprising: a first analog phase shift circuit and a second analog phase shift circuit; the first analog phase shift circuit receives a first radio frequency signal and outputs a third radio frequency signal and a fourth radio frequency signal, the first analog phase shift circuit outputs the third radio frequency signal and the fourth radio frequency signal after analog phase shifting at least one of the third radio frequency signal and the fourth radio frequency signal; the second analog phase shift circuit receives a second radio frequency signal and outputs a fifth radio frequency signal and a sixth radio frequency signal, the second analog phase shift circuit outputs the fifth radio frequency signal and the sixth radio frequency signal after analog phase shifting at least one of the fifth radio frequency signal and the sixth radio frequency signal; wherein the phases of the first radio frequency signal and the second radio frequency signal are different.

[0007] The radio frequency circuit provided by the embodiments of the present application includes two analog phase shift circuits, each analog phase shift circuit couples two radio frequency signals from the input radio frequency signal, and analog phase shifts at least one of the two radio frequency signals, the two analog phase shift circuits output four radio frequency signals and transmit them through four antennas respectively, the two analog phase shift circuits realize analog beamforming, and the input radio frequency signal of each analog phase shift circuit has been analog phase shifted in advance, the entire radio frequency circuit realizes hybrid beamforming of the two analog phase shift circuits and four antennas. Since only two analog phase shift circuits are needed to realize the transmission of four radio frequency signals, the hardware cost and volume of the communication device are reduced.

[0008] In a possible implementation, the first analog phase shift circuit includes a first quadrature coupler and a first phase shifter, the first input end and the first output end of the first quadrature coupler are in a through path, the first input end and the second output end are in a coupling path, the second input end and the second output end are in a through path, and the second input end and the first output end are in a coupling path; the second output end of the first quadrature coupler is coupled to the input end of the first phase shifter; the first input end or the second input end of the first quadrature coupler inputs the first radio frequency signal, the first output end of the first quadrature coupler outputs the third radio frequency signal, the first output end of the first quadrature coupler outputs the fourth radio frequency signal, or the first output end of the first quadrature coupler outputs the fourth radio frequency signal, and the first output end of the first quadrature coupler outputs the third radio frequency signal. The coupling path of the quadrature coupler produces a 90-degree phase shift relative to the through path, and the phase shifter produces a phase shift of a degrees, so that the first analog phase shift circuit can realize that the radio frequency signals transmitted by the two antennas have a phase difference of a degrees, a+90 degrees, a+180 degrees, or a+270 degrees.

[0009] In a possible implementation, the first analog phase shift circuit further includes a first power amplifier, a first matching circuit, a first switch, and a second switch; the input end of the first power amplifier inputs the first radio frequency signal; the first switch couples the output end of the first power amplifier to the first input end of the first quadrature coupler, and couples the first matching circuit to the second input end of the first quadrature coupler, or the first switch couples the output end of the first power amplifier to the second input end of the first quadrature coupler, and couples the first matching circuit to the first input end of the first quadrature coupler; the second switch couples the first output end of the first quadrature coupler to the first antenna, and couples the output end of the first phase shifter to the second antenna, or the second switch couples the first output end of the first quadrature coupler to the second antenna, and couples the output end of the first phase shifter to the first antenna.

[0010] In a possible implementation, the first analog phase shift circuit further includes a fifth switch, and the fifth switch, the first switch, and the second switch further couple the output end of the first power amplifier to the first antenna or the second antenna. So that the first radio frequency signal is not transmitted through the first antenna or the second antenna after passing through the first quadrature coupler and the first phase shifter, that is, the first radio frequency signal is not subjected to analog phase shift and analog beam forming, so as to be compatible with multiple modes, so that the entire communication device can realize digital phase shift and digital beam forming.

[0011] In a possible implementation, the second analog phase shift circuit includes a second quadrature coupler and a second phase shifter, the first input end and the first output end of the second quadrature coupler are a through path, the first input end and the second output end are a coupled path, the second input end and the second output end are a through path, and the second input end and the first output end are a coupled path; the second output end of the second quadrature coupler is coupled to the input end of the second phase shifter; the first input end or the second input end of the second quadrature coupler inputs the second radio frequency signal, the first output end of the second quadrature coupler outputs the fifth radio frequency signal, the first output end of the second quadrature coupler outputs the sixth radio frequency signal, or the first output end of the second quadrature coupler outputs the sixth radio frequency signal, and the first output end of the second quadrature coupler outputs the fifth radio frequency signal. The coupled path of the quadrature coupler produces a 90-degree phase shift relative to the through path, and the phase shifter produces a degree phase shift, so that the second analog phase shift circuit can realize that the radio frequency signals transmitted by the two antennas have a degree, a+90 degree, a+180 degree, and a+270 degree phase difference.

[0012] In a possible implementation, the second analog phase shift circuit further includes a second power amplifier, a second matching circuit, a third switch, and a fourth switch; the input end of the second power amplifier inputs the second radio frequency signal; the third switch couples the output end of the second power amplifier to the first input end of the second quadrature coupler, and couples the second matching circuit to the second input end of the second quadrature coupler, or the third switch couples the output end of the second power amplifier to the second input end of the second quadrature coupler, and couples the second matching circuit to the first input end of the second quadrature coupler; the fourth switch couples the first output end of the second quadrature coupler to the third antenna, and couples the output end of the second phase shifter to the fourth antenna, or the second switch couples the first output end of the second quadrature coupler to the fourth antenna, and couples the output end of the second phase shifter to the third antenna.

[0013] In a possible implementation, the second analog phase shift circuit further includes a sixth switch, and the sixth switch, the third switch, and the fourth switch further couple the output end of the second power amplifier to the third antenna or the fourth antenna. So that the second radio frequency signal is not transmitted through the third antenna or the fourth antenna after passing through the second quadrature coupler and the second phase shifter, that is, the second radio frequency signal is not subjected to analog phase shift and analog beam forming, so as to be compatible with multiple modes, so that the entire communication device can realize digital phase shift and digital beam forming.

[0014] In a possible implementation, the first analog phase-shifting circuit is a first balanced amplifier circuit, the first balanced amplifier circuit comprising a first coupling device, a first phase shifter, a first power amplifier and a second power amplifier, the first coupling device coupling the first radio frequency signal to obtain a third radio frequency signal and a fourth radio frequency signal, a first input end of the first coupling device inputting the first radio frequency signal, a first output end of the first coupling device being coupled to an input end of the first power amplifier to output the third radio frequency signal, a second output end of the first coupling device being coupled to an input end of the first phase shifter to output the fourth radio frequency signal, and an output end of the first phase shifter being coupled to an input end of the second power amplifier. Compared with the above-mentioned scheme using the coupling device, the insertion loss is smaller, the 0.3 dB can be further optimized, and the product area is smaller, saving the internal space of the communication device.

[0015] In a possible implementation, the first coupling device is a quadrature coupler, a power divider or a transformer. The first coupling device can be a device such as a quadrature coupler, a power divider or a transformer, which can couple one radio frequency signal to obtain two radio frequency signals.

[0016] In a possible implementation, the second analog phase-shifting circuit is a second balanced amplifier circuit, the second balanced amplifier circuit comprising a second coupling device, a second phase shifter, a third power amplifier and a fourth power amplifier, the second coupling device coupling the second radio frequency signal to obtain a fifth radio frequency signal and a sixth radio frequency signal, a first input end of the second coupling device inputting the first radio frequency signal, a first output end of the second coupling device being coupled to an input end of the third power amplifier to output the fifth radio frequency signal, a second output end of the second coupling device being coupled to an input end of the second phase shifter to output the sixth radio frequency signal, and an output end of the second phase shifter being coupled to an input end of the fourth power amplifier. Compared with the above-mentioned scheme using the coupling device, the insertion loss is smaller, the 0.3 dB can be further optimized, and the product area is smaller, saving the internal space of the communication device.

[0017] In a possible implementation, the second coupling device is a quadrature coupler, a power divider or a transformer. The second coupling device can be a device such as a quadrature coupler, a power divider or a transformer, which can couple one radio frequency signal to obtain two radio frequency signals.

[0018] In a second aspect, a communication apparatus is provided, which comprises the radio frequency circuit and the radio frequency signal generation circuit according to the first aspect and any one of the implementations of the first aspect, the radio frequency signal generation circuit outputs a first radio frequency signal and a second radio frequency signal to the radio frequency circuit, the first radio frequency signal and the second radio frequency signal are different in phase; the radio frequency circuit outputs a third radio frequency signal, a fourth radio frequency signal, a fifth radio frequency signal and a sixth radio frequency signal, wherein the third radio frequency signal and the fourth radio frequency signal are derived from the first radio frequency signal, and the third radio frequency signal and the fourth radio frequency signal are different in phase; the fifth radio frequency signal and the sixth radio frequency signal are derived from the second radio frequency signal, and the fifth radio frequency signal and the sixth radio frequency signal are different in phase. The communication apparatus can be a circuit board, an integrated circuit or a package on a circuit board, a terminal device or an electronic device, etc.

[0019] The technical effects of the second aspect are referred to the technical effects of the first aspect and any one of the implementations of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic diagram of beamforming of N antennas is provided for the embodiments of the present application;

[0021] Figure 2 A structural schematic diagram of a communication apparatus is provided for the embodiments of the present application;

[0022] Figure 3 A structural schematic diagram of another communication apparatus is provided for the embodiments of the present application;

[0023] Figure 4 A structural schematic diagram of still another communication apparatus is provided for the embodiments of the present application;

[0024] Figure 5 A schematic diagram of the flow direction of a radio frequency signal is provided for the embodiments of the present application;

[0025] Figure 6 A structural schematic diagram of still another communication apparatus is provided for the embodiments of the present application;

[0026] Figure 7 A structural schematic diagram of a radio frequency circuit is provided for the embodiments of the present application Figure 1 ;

[0027] Figure 8 A schematic diagram of a working state one of a first analog phase-shifting circuit is provided for the embodiments of the present application;

[0028] Figure 9 A schematic diagram of a working state two of a first analog phase-shifting circuit is provided for the embodiments of the present application;

[0029] Figure 10 A schematic diagram of a working state three of a first analog phase-shifting circuit is provided for the embodiments of the present application;

[0030] Figure 11 A schematic diagram of a fourth working state of a first analog phase-shifting circuit provided for an embodiment of the present application;

[0031] Figure 12 A schematic diagram of a first working state of a second analog phase-shifting circuit provided for an embodiment of the present application;

[0032] Figure 13 A schematic diagram of a second working state of a second analog phase-shifting circuit provided for an embodiment of the present application;

[0033] Figure 14 A schematic diagram of a third working state of a second analog phase-shifting circuit provided for an embodiment of the present application;

[0034] Figure 15 A schematic diagram of a fourth working state of a second analog phase-shifting circuit provided for an embodiment of the present application;

[0035] Figure 16 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 2 ;

[0036] Figure 17 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 3 ;

[0037] Figure 18 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 4 ;

[0038] Figure 19 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 5 ;

[0039] Figure 20 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 6 ;

[0040] Figure 21 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 7 ;

[0041] Figure 22 A schematic diagram of a first working state of a first analog phase-shifting circuit provided for an embodiment of the present application;

[0042] Figure 23 A schematic diagram of a second working state of a first analog phase-shifting circuit provided for an embodiment of the present application;

[0043] Figure 24A schematic diagram of a third working state of a first analog phase shift circuit provided for an embodiment of the present application;

[0044] Figure 25 A schematic diagram of a first working state of a second analog phase shift circuit provided for an embodiment of the present application;

[0045] Figure 26 A schematic diagram of a second working state of a second analog phase shift circuit provided for an embodiment of the present application;

[0046] Figure 27 A schematic diagram of a third working state of a second analog phase shift circuit provided for an embodiment of the present application;

[0047] Figure 28 A structure schematic of a radio frequency circuit provided for an embodiment of the present application Figure 8 . DETAILED DESCRIPTION

[0048] As used in this application, the terms "component," "module," "system" and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and / or thread of execution and a component can be localized, partially localized, and / or distributed across two or more computers. Also, these components can execute from various computer readable media having various data structures stored thereon. The components can communicate by way of local and / or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and / or across a network such as the Internet with other systems via the signal).

[0049] The "coupling" or "coupled" between two devices involved in the present application includes direct electrical connection or indirect electrical connection of the two devices.

[0050] Embodiments of the present application rely on the scenario of the fifth generation (5th generation, 5G) network in the wireless communication network, and it should be pointed out that the scheme in the embodiments of the present application can also be applied to other wireless communication networks, and the corresponding name can also be replaced by the name of the corresponding function in other wireless communication networks.

[0051] First, the concepts involved in the present application are described:

[0052] Beamforming is derived from adaptive antenna. When receiving end processes signals, it can form the desired signal by weighting and combining the multiple signals received by multiple antennas, which is reflected in the receiving pattern, i.e. a specific directional beam is formed, for example, the original omnidirectional receiving pattern is converted into a lobed pattern with a zero point and a maximum direction. The same principle also applies to the transmitting end. By adjusting the amplitude and phase of the signal, a specific transmitting pattern can be formed, so that the signals transmitted by multiple antennas can be coherently superimposed when reaching the receiving end, so as to improve the receiving power. The amplitude and phase of the signal adjusted by the transmitting end are called weights, and the application of these amplitudes and phases to multiple antenna transmission is called weighting. Coherent superposition of signals can make the signals transmitted by multiple antennas reach the receiving end in a completely or nearly in-phase state, realizing the effect of superposition of multiple antenna signals. Beamforming technology includes analog beamforming (implemented through radio frequency circuit), digital beamforming (implemented through digital baseband) and hybrid beamforming (implemented through radio frequency circuit for analog beamforming and through digital baseband for digital beamforming).

[0053] The beamforming involved in the present application can be realized by phase shifting, i.e. adjusting the phase of the signal transmitted by multiple antennas without adjusting the amplitude and frequency of the signal, i.e. each antenna transmits with the same amplitude and frequency but different phases.

[0054] Gain principle of beamforming: when the channels of N antennas are completely correlated (i.e. there is only a phase difference caused by the difference in the distance of the wireless signal), compared with transmitting signals through one antenna, transmitting signals through N antennas with appropriate phase shift (hereinafter referred to as phase shift) can make the receiving side obtain a power gain of 10lgN dB. Even if the channels of N antennas have only partial correlation (i.e. there is an amplitude difference in addition to the above-mentioned phase difference), the proportion ρ of the maximum eigenvalue of the air interface channel in the total power of the channel is higher than 1 / N, then the beamforming gain obtained by weighting and transmitting the uplink signal with the maximum eigenvalue of the air interface channel as the weight is 10lgρN dB, and the higher the correlation between the channels of the antennas, the greater the proportion ρ, and the greater the beamforming gain.

[0055] Specifically, as shown in FIG. 1, in a line of sight (LOS) scenario, the uplink channel matrix of a terminal device with N uniform linear array antennas is: Figure 1

[0056]

[0057] wherein H UL represents the uplink channel matrix, h0, h1, h N-1 ​λ represents the weighting coefficient, the number of rows in the uplink channel matrix is ​​the number of base station antennas, the number of columns in the uplink channel matrix is ​​the number of terminal device transmitting antennas N, λ represents the carrier wavelength, and d represents the spacing between adjacent antennas. Indicates the angle of incidence.

[0058] Option 1 (Single Antenna Transmission Scheme): If the terminal device uses only one antenna to transmit the uplink signal, and all the uplink power P is transmitted through this single antenna (e.g., antenna 0), then the base station receives the following signal:

[0059]

[0060] Where y represents the signal received by the base station, and H UL Let h0 represent the uplink channel matrix, P represent the total uplink power, s represent the transmitted data stream, and n represent the base station received noise. If the noise power is N0, then the signal-to-noise ratio obtained by Scheme 1 is:

[0061]

[0062] Option 2 (beamforming scheme): If the total uplink power P is evenly distributed among all antennas, and different phase shifts are applied to different antennas, then the base station received signal will be:

[0063]

[0064] Where y represents the base station received signal, h0 represents the weighting coefficient, P represents the total uplink power, s represents the transmitted data stream, λ represents the carrier wavelength, N represents the number of transmitting antennas of the terminal device, and d represents the spacing between adjacent antennas. θ represents the angle of incidence. n Let n represent the transmit phase of antenna n, where n = 0, 1, ..., N-1. Then the uplink signal-to-noise ratio obtained by beamforming is:

[0065]

[0066] Among them, SNR BF Here, N0 represents the uplink signal-to-noise ratio, h0 represents the weighting coefficient, and d represents the spacing between adjacent antennas. Let θ represent the incident angle, P represent the total uplink power, λ represent the carrier wavelength, N represent the number of transmitting antennas of the terminal device, and θ represent the total uplink power. n This represents the transmission phase of antenna n, where n = 0, 1, ..., N-1.

[0067] When the transmission phase is selected to exactly compensate for the phase difference of each antenna channel, that is... When, Formula 5 can be expressed as That is, the signal-to-noise ratio is improved by N times compared to the single-antenna transmission scheme by beamforming through N antennas, that is, the power gain is 10lgNdB.

[0068] The communication device involved in the embodiments of this application can be a device that includes wireless transceiver functions and can cooperate with network equipment to provide communication services to users. Specifically, the communication device can refer to terminal equipment, user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment. For example, the communication device can be outdoor communication equipment such as customer premises equipment (CPE), bridge, monitor, electronic screen, and color light control; it can be a mobile phone, smart speaker, smartwatch, handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, robot, drone, intelligent driving vehicle, smart home, in-vehicle equipment, medical equipment, smart logistics equipment, wearable device, communication device in 5G network or future network after 5G, etc. The embodiments of this application do not limit this.

[0069] like Figure 2 As shown, taking a mobile phone as an example, the structure of the communication device is described. The communication device 200 can be a mobile phone. The communication device 200 may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (USB) interface 230, a power management module 240, a battery 241, a wireless charging coil 242, antenna 1, antenna 2, a mobile communication module 250, a wireless communication module 260, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, a headphone jack 270D, a sensor module 280, buttons 290, a motor 291, an indicator 292, a camera 293, a display screen 294, and a subscriber identification module (SIM) card interface 295, etc.

[0070] The sensor module 280 may include pressure sensors, gyroscope sensors, barometric pressure sensors, magnetic sensors, accelerometers, distance sensors, proximity sensors, fingerprint sensors, temperature sensors, touch sensors, ambient light sensors, bone conduction sensors, etc.

[0071] It can be understood that the structure illustrated by the embodiment does not constitute a specific limitation on the communication device 200. In other embodiments of the application, the communication device 200 can include more or fewer components than those illustrated, or combine some components, or split some components, or different arrangement of components. The illustrated components can be implemented in hardware, software or a combination of software and hardware.

[0072] The processor 210 can include one or more processing units, for example: the processor 210 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and a neural-network processing unit (NPU), etc. Among them, different processing units can be independent devices, or can be integrated in one or more processors. For example, the processor 210 can be an application processor AP. Or, the above processor 210 can be integrated in a system on Chip (SOC). Or, the above processor 210 can be integrated in an IC chip. The processor 210 can include an analog front end (AFE) and a microcontroller unit (MCU) in an integrated circuit chip.

[0073] Among them, the controller can be the nerve center and command center of the communication device 200. The controller can generate operation control signals according to instruction operation codes and timing signals to complete the control of fetching instructions and executing instructions.

[0074] The memory can also be provided in the processor 210 for storing instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. The memory can save instructions or data that the processor 210 has just used or repeatedly uses. If the processor 210 needs to use the instructions or data again, it can directly call from the memory. Avoiding repeated access, reducing the waiting time of the processor 210, thus improving the efficiency of the system.

[0075] In some embodiments, the processor 210 can include one or more interfaces. The interfaces can include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a USB interface, etc.

[0076] It can be understood that the interface connection relationship between the modules shown in the embodiments is only illustrative and does not constitute a structural limitation of the communication apparatus 200. In other embodiments of the present application, the communication apparatus 200 can also use different interface connection modes or a combination of multiple interface connection modes.

[0077] The power management module 240 is configured to receive charging input from a charger. The charger can be a wireless charger (such as a wireless charging base of the communication apparatus 200 or other device capable of wirelessly charging the communication apparatus 200) or a wired charger. For example, the power management module 240 can receive charging input from a wired charger through the USB interface 230. The power management module 240 can receive wireless charging input through a wireless charging coil 242 of the communication apparatus.

[0078] The power management module 240 can supply power to the communication apparatus while charging the battery 241. The power management module 240 receives input from the battery 241 to supply power to the processor 210, the pressure sensor, the internal memory 221, the external memory interface 220, the display screen 294, the camera 293, and the wireless communication module 260, etc. The power management module 240 can also be configured to monitor parameters such as battery capacity, battery cycle count, battery health status (leakage, impedance), etc. of the battery 241. In other embodiments, the power management module 240 can also be disposed in the processor 210. For example, in the embodiments of the present application, the power management module 240 can provide a constant voltage source (such as a constant voltage of 5 volts (V)) or a constant current source for the pressure sensor.

[0079] The wireless communication function of the communication device 200 can be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem processor, and the baseband processor, etc.

[0080] The antenna 1 and the antenna 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the communication device 200 can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example, the antenna 1 can be multiplexed as a diversity antenna of a wireless local area network. In some other embodiments, the antennas can be used in combination with a tuning switch.

[0081] The mobile communication module 250 can provide a solution for wireless communication including 2G / 3G / 4G / 5G, etc. applied on the communication device 200. The wireless communication module 260 can provide a solution for wireless communication including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) technology, etc. applied on the communication device 200. In some embodiments, the antenna 1 of the communication device 200 is coupled with the mobile communication module 250, and the antenna 2 is coupled with the wireless communication module 260, so that the communication device 200 can communicate with a network and other devices through wireless communication technology.

[0082] The communication device 200 implements the display function through the GPU, the display screen 294, and the application processor, etc. The GPU is a microprocessor for image processing, which is connected with the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 210 can include one or more GPUs, which execute program instructions to generate or change display information.

[0083] The display screen 294 is used to display images, videos, etc. The display screen 294 includes a display panel. In some embodiments, the communication device 200 can include 1 or N display screens 294, N being a positive integer greater than 1.

[0084] The communication apparatus 200 can implement a photographing function through an ISP, a camera 293, a video codec, a GPU, a display screen 294, and an application processor, etc. The ISP is configured to process data fed back by the camera 293. In some embodiments, the ISP can be disposed in the camera 293. The camera 293 is configured to capture a still image or a video. In some embodiments, the communication apparatus 200 can include one or N cameras 293, where N is a positive integer greater than 1.

[0085] The external memory interface 220 can be configured to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the communication apparatus 200. The external memory card is configured to communicate with the processor 210 through the external memory interface 220 to implement a data storage function. For example, files such as music and videos can be saved in the external memory card.

[0086] The internal memory 221 can be configured to store computer-executable program code including instructions. The processor 210 is configured to execute various function applications and data processing of the communication apparatus 200 by running the instructions stored in the internal memory 221. In addition, the internal memory 221 can include a high-speed random access memory, and can also include a non-volatile memory.

[0087] The communication apparatus 200 can implement an audio function through an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, a headset interface 270D, and an application processor, etc. For example, music playing, recording, etc.

[0088] The audio module 270 is configured to convert digital audio information into an analog audio signal output, and is also configured to convert an analog audio input into a digital audio signal. In some embodiments, the audio module 270 can be disposed in the processor 210, or part of the function modules of the audio module 270 can be disposed in the processor 210. The speaker 270A, also known as a “loudspeaker”, is configured to convert an audio electrical signal into a sound signal. The receiver 270B, also known as a “earpiece”, is configured to convert an audio electrical signal into a sound signal. The microphone 270C, also known as a “microphone”, “sound transducer”, is configured to convert a sound signal into an electrical signal. The communication apparatus 200 can be provided with at least one microphone 270C. The headset interface 270D is configured to connect a wired headset. The headset interface 270D can be a USB interface 230, or a 3.5 mm open mobile terminal platform (OMTP) standard interface, a cellular telecommunications industry association of the USA (CTIA) standard interface.

[0089] The keys 290 include a power-on key, a volume key, and the like. The keys 290 can be mechanical keys. They can also be touch keys. The communication device 200 can receive key inputs and generate key signal inputs related to user settings and function control of the communication device 200. The motor 291 can generate a vibration prompt. The motor 291 can be used for incoming call vibration prompts and also for touch vibration feedback. The indicator 292 can be an indicator light that can be used to indicate a charging state, a power change, and also to indicate a message, a missed call, a notification, and the like. The SIM card interface 295 is used to connect a SIM card. The SIM card can be inserted into or removed from the SIM card interface 295 to achieve contact and separation with the communication device 200. The communication device 200 can support one or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 can support a Nano SIM card, a Micro SIM card, a SIM card, and the like. In some embodiments, the communication device 200 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the communication device 200 and cannot be separated from the communication device 200.

[0090] Due to the size and power consumption limitations of the communication device, the mobile communication module 250 of the communication device can include two or four transmission channels, where a transmission channel refers to a path that converts a baseband signal into a radio frequency signal and transmits it from an antenna, and each transmission channel is used to transmit a radio frequency signal. These transmission channels can be used for beamforming of the transmitted signal, and the weight of the phase shift of each transmission channel on the transmitted signal can be quantized by an uplink coherent codebook. The upper limit of the gain that can be achieved by beamforming is described in the foregoing content related to beamforming gain. For two transmission channels, the upper limit of the gain that can be achieved by beamforming is 3dB, and for four transmission channels, the upper limit of the gain that can be achieved by beamforming is 6dB. If both the communication device and the base station of the access network in which the communication device is located support an uplink coherent codebook of two transmission channels, the base station can estimate from the uplink reference signal transmitted by the communication device, select an optimal code word index from the uplink coherent codebook, and send it to the communication device through a downlink control channel. The communication device parses the downlink control channel to obtain the code word index indicated by the base station, and uses the corresponding code word to phase shift the signals of each transmission channel.

[0091] Currently, a communication device supporting 5G communication uses two transmission channels, and the quantization granularity of the uplink coherent codebook of each transmission channel is relatively coarse, only supporting phase shifts of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. If the path difference of each antenna does not belong to these four phases, the theoretical maximum gain upper limit of 3dB cannot be achieved. In addition, using two transmission channels for beamforming can only weight the transmission signals of two antennas, and cannot achieve the maximum gain upper limit of 6dB for four antennas.

[0092] In a possible implementation, the communication device can implement the beamforming in the uplink direction by coupling phase shifters between radio frequency transceivers (or radio frequency integrated circuits, RFICs) and radio frequency front ends of multiple transmit channels. As shown in Figure 3 The communication device includes an application processor (AP) 301, a digital baseband (DBB) processor 302, radio frequency transceivers 303, multiple phase shifters 304, multiple radio frequency front ends 305, and multiple antennas 306.

[0093] The application processor 301 is configured to receive demodulated data from the DBB processor 302 or send data to be modulated to the DBB processor 302. The DBB processor 302 is configured to perform digital domain processing of signals, for example, modulating a transmit signal and demodulating a received signal in the digital domain. The radio frequency transceiver 303 can be a transceiver in a zero intermediate frequency architecture or a superheterodyne architecture, configured to perform digital-to-analog conversion of the transmit signal, upshift the transmit signal from a baseband to an intermediate frequency, upshift the transmit signal from the intermediate frequency to a radio frequency, downshift a received signal from the radio frequency to the intermediate frequency, downshift the received signal from the intermediate frequency to the baseband, and perform analog-to-digital conversion of the received signal. The phase shifter 304 is configured to perform phase shifting of the transmit signal. The radio frequency front end 305 includes a transmit path and a receive path. The transmit path is configured to amplify the transmit signal and transmit the amplified transmit signal through the antenna 306, and includes a power amplifier (PA), a filter, and the like. The receive path is configured to amplify a received signal through the antenna 306, and includes a low noise amplifier (LNA), a filter, and the like.

[0094] The communication device implements the beamforming in the uplink direction by adding a phase shifter 304 between the radio frequency transceiver 303 and each radio frequency front end 305, and adjusting the phase of a radio frequency signal transmitted between the radio frequency transceiver 303 and the radio frequency front end 305 by the phase shifter 304, so as to improve the uplink coverage performance. However, this method uses four radio frequency front ends 305, and the large number of devices leads to high cost and large printed circuit board (PCB) area, which is not conducive to low cost and miniaturization of the product.

[0095] In another possible implementation, the communication device can also couple a Butler matrix phase shift network between the radio frequency front end of a transmit channel and the antenna to implement the beamforming in the uplink direction. As shown in Figure 4As shown, the communication device comprises an application processor 301, a DBB processor 302, a radio frequency transceiver 303, a radio frequency front end 305, a Butler matrix phase shift network 307, and a plurality of antennas 306, the Butler matrix phase shift network 307 comprising a single-pole four-throw switch 401, a first quadrature coupler 402, a second quadrature coupler 403, a third quadrature coupler 404, a fourth quadrature coupler 405, a first phase shifter 406, a second phase shifter 407, a first cross-over bridge 408, and a second cross-over bridge 409.

[0096] An output end of the radio frequency front end 305 is coupled to a fixed end of the single-pole four-throw switch 401. A first output end of the single-pole four-throw switch 401 is coupled to a first input end of the first quadrature coupler 402, a second output end of the single-pole four-throw switch 401 is coupled to a second input end of the first quadrature coupler 402, a third output end of the single-pole four-throw switch 401 is coupled to a first input end of the third quadrature coupler 404, and a fourth output end of the single-pole four-throw switch 401 is coupled to a second input end of the third quadrature coupler 404.

[0097] A first output end of the first quadrature coupler 402 is coupled to a first input end of the second quadrature coupler 403 through the first phase shifter 406, and a second output end of the first quadrature coupler 402 is coupled to a first input end of the fourth quadrature coupler 405 through the first cross-over bridge 408. A first output end of the third quadrature coupler 404 is coupled to a second input end of the second quadrature coupler 403 through the first cross-over bridge 408, and a second output end of the third quadrature coupler 404 is coupled to a second input end of the fourth quadrature coupler 405 through the second phase shifter 407.

[0098] A first output end of the second quadrature coupler 403 is coupled to the first antenna ANT1, a second output end of the second quadrature coupler 403 is coupled to the second antenna ANT2 through the second cross-over bridge 409, a first output end of the fourth quadrature coupler 405 is coupled to the third antenna ANT3 through the second cross-over bridge 409, and a second output end of the fourth quadrature coupler 405 is coupled to the fourth antenna ANT4.

[0099] It should be noted that in the drawings of the present application, the first input end, the second input end, the first output end, and the second output end of the quadrature coupler are sequentially represented by the labels 1-4. For each quadrature coupler, the first input end and the first output end are a straight-through path, the first input end and the second output end are a coupling path, the second input end and the second output end are a straight-through path, and the second input end and the first output end are a coupling path. The phase of the radio frequency signals transmitted between the straight-through path and the coupling path of the same input end is different by 90 degrees. For example, Figure 5As shown, the direction of the radio frequency signal is shown when the single-pole four-throw switch 401 is switched to the first input terminal of the first quadrature coupler 402. This enables one transmission channel to synthesize radio frequency signals of four phases, thereby achieving beamforming.

[0100] However, this scheme only supports beamforming for one transmit channel because it couples to the Butler matrix phase-shifting network after the RF front-end. For two transmit channels, a power amplifier (PA) is required to support higher gain (e.g., PC2 specification). In addition, the two-stage quadrature coupler and phase shifter used in the Butler matrix phase-shifting network have certain losses, resulting in a significant decrease in overall efficiency.

[0101] Therefore, this application provides a communication device including a radio frequency (RF) circuit. This RF circuit includes two analog phase-shifting circuits. Each analog phase-shifting circuit couples two RF signals from the input RF signal and then performs analog phase shifting on at least one of these two RF signals. The two analog phase-shifting circuits output four RF signals, which are transmitted through four antennas respectively. These two analog phase-shifting circuits achieve analog beamforming, while the RF signal input to each analog phase-shifting circuit has already undergone digital phase shifting. The entire RF circuit achieves hybrid beamforming for two transmission channels and four antennas. Since the range of digital phase shifting can be arbitrarily adjusted, it is not limited by the range of analog phase shifting adjustment, allowing the beamforming gain to reach the theoretical limit of 6dB. The implementation of this application can be applied not only to 5G communication systems but also to other communication systems, such as the subsequent evolution of sixth-generation (6G) communication systems.

[0102] like Figure 6 As shown, the communication device includes a radio frequency (RF) circuit 61, an RF signal generation circuit 62, and an antenna 306. The RF circuit 61 includes a first analog phase-shifting circuit 611 and a second analog phase-shifting circuit 612. The RF signal generation circuit 62 can be a chip, or it may include a DBB processor 302 and an RF transceiver 303. The antenna 306 includes a first antenna ANT1, a second antenna ANT2, a third antenna ANT3, and a fourth antenna ANT4.

[0103] The output of DBB processor 302 is coupled to the input of radio frequency transceiver 303. The first output of radio frequency transceiver 303 is coupled to the input of first analog phase shift circuit 611. The two outputs of first analog phase shift circuit 611 are coupled to first antenna ANT1 and second antenna ANT2, respectively. The second output of radio frequency transceiver 303 is coupled to the input of second analog phase shift circuit 612. The two outputs of second analog phase shift circuit 612 are coupled to third antenna ANT3 and fourth antenna ANT4, respectively.

[0104] The radio frequency transceiver (or RFIC) 303 comprises a transmitter and a receiver (not shown in the figure), the transmitter is configured to process the transmit signals from the DBB processor 302 to output a first radio frequency signal to the first analog phase shift circuit 611 and a second radio frequency signal to the second analog phase shift circuit 612. The processing includes digital phase shift, digital to analog conversion, upshifting from baseband to intermediate frequency, and upshifting from intermediate frequency to radio frequency. For the digital phase shift, the DBB processor 302 can output two transmit signals to the transmitter, the transmitter performs digital phase shift on at least one of the two transmit signals to obtain the first radio frequency signal and the second radio frequency signal, so that the first radio frequency signal and the second radio frequency signal have the same frequency and amplitude but different phases, thereby realizing digital beamforming. Alternatively, the DBB processor 302 can output one transmit signal to the transmitter, the transmitter couples the transmit signal to obtain two transmit signals, and performs digital phase shift on at least one of the two transmit signals to obtain the first radio frequency signal and the second radio frequency signal, so that the first radio frequency signal and the second radio frequency signal have the same frequency and amplitude but different phases, thereby realizing digital beamforming. The present application does not limit the phases of the first radio frequency signal and the second radio frequency signal, and the digital phase shift can realize a larger phase adjustment range than the analog phase shift.

[0105] The first analog phase shift circuit 611 couples the first radio frequency signal to obtain a third radio frequency signal and a fourth radio frequency signal, and outputs the third radio frequency signal and the fourth radio frequency signal after performing analog phase shift on at least one of the third radio frequency signal and the fourth radio frequency signal, the third radio frequency signal and the fourth radio frequency signal have the same frequency and amplitude but different phases.

[0106] The second analog phase shift circuit 612 couples the second radio frequency signal to obtain a fifth radio frequency signal and a sixth radio frequency signal, and outputs the fifth radio frequency signal and the sixth radio frequency signal after performing analog phase shift on at least one of the fifth radio frequency signal and the sixth radio frequency signal, the fifth radio frequency signal and the sixth radio frequency signal have the same frequency and amplitude but different phases.

[0107] The following describes several possible structures of the first analog phase shift circuit 611 and the second analog phase shift circuit 612.

[0108] In one possible implementation, as Figure 7As shown, the first analog phase-shifting circuit 611 includes a first PA 711, a first quadrature coupler 712, a first phase shifter 713, a first matching circuit 714, a first switch 715, and a second switch 716, wherein the first output terminal of the radio frequency transceiver 303 is coupled to an input terminal of the first PA 711, a second output terminal of the first quadrature coupler 712 is coupled to an input terminal of the first phase shifter 713, four contacts of the first switch 715 are coupled to an output terminal of the first PA 711, the first matching circuit 714, a first input terminal and a second input terminal of the first quadrature coupler 712 respectively, and four contacts of the second switch 716 are coupled to a first output terminal of the first quadrature coupler 712, an output terminal of the first phase shifter 713, the first antenna ANT1 and the second antenna ANT2 respectively.

[0109] The first PA 711 is configured to perform power amplification on the first radio frequency signal.

[0110] The first quadrature coupler 712 is configured to couple the first radio frequency signal input from one input terminal to obtain two radio frequency signals and output from two output terminals respectively. As described above, the phase of the radio frequency signals transmitted between the through path and the coupling path of the same input terminal of the quadrature coupler is different by 90 degrees, so the phase of the two radio frequency signals output by the first quadrature coupler 712 is different by 90 degrees.

[0111] The first phase shifter 713 is configured to perform analog phase shifting on the input radio frequency signal.

[0112] The first matching circuit 714 is configured to reduce the reflection of the radio frequency signal and improve the transmission efficiency.

[0113] The first switch 715 is configured to couple the output terminal of the first PA 711 to the first input terminal of the first quadrature coupler 712 and couple the first matching circuit 714 to the second input terminal of the first quadrature coupler 712, or to couple the output terminal of the first PA 711 to the second input terminal of the first quadrature coupler 712 and couple the first matching circuit 714 to the first input terminal of the first quadrature coupler 712.

[0114] The second switch 716 is configured to couple the first output terminal of the first quadrature coupler 712 to the first antenna ANT1 and couple the output terminal of the first phase shifter 713 to the second antenna ANT2, or to couple the first output terminal of the first quadrature coupler 712 to the second antenna ANT2 and couple the output terminal of the first phase shifter 713 to the first antenna ANT1.

[0115] The second analog phase-shifting circuit 612 comprises a second PA 721, a second quadrature coupler 722, a second phase shifter 723, a second matching circuit 724, a third switch 725, and a fourth switch 726, wherein a second output end of the radio frequency transceiver 303 is coupled to an input end of the second PA 721, a second output end of the second quadrature coupler 722 is coupled to an input end of the second phase shifter 723, four contacts of the third switch 725 are coupled to an output end of the second PA 721, the second matching circuit 724, a first input end and a second input end of the second quadrature coupler 722 respectively.

[0116] The second PA 721 is configured to perform power amplification on the second radio frequency signal.

[0117] The second quadrature coupler 722 is configured to couple the second radio frequency signal input from one input end to obtain two radio frequency signals and output the two radio frequency signals from two output ends respectively. As described above, the phase of the radio frequency signal transmitted between the through path and the coupling path of the same input end of the quadrature coupler is different by 90 degrees, so the phase of the two radio frequency signals output by the second quadrature coupler 722 is different by 90 degrees.

[0118] The second phase shifter 723 is configured to perform analog phase shifting on the input radio frequency signal.

[0119] The second matching circuit 724 is configured to reduce the reflection of the radio frequency signal and improve the transmission efficiency.

[0120] The third switch 725 is configured to couple the output end of the second PA 721 to the first input end of the second quadrature coupler 722, and couple the second matching circuit 724 to the second input end of the second quadrature coupler 722, or is configured to couple the output end of the second PA 721 to the second input end of the second quadrature coupler 722, and couple the second matching circuit 724 to the first input end of the second quadrature coupler 722.

[0121] The fourth switch 726 is configured to couple the first output end of the second quadrature coupler 722 to the third antenna ANT3, and couple the output end of the second phase shifter 723 to the fourth antenna ANT4, or is configured to couple the second output end of the second quadrature coupler 722 to the fourth antenna ANT4, and couple the output end of the second phase shifter 723 to the third antenna ANT3.

[0122] The application does not limit the phase-shifting angle of the first phase shifter 713 and the second phase shifter 723, which can be 45 degrees exemplarily. The first phase shifter 713 and the second phase shifter 723 can be resonant circuits.

[0123] The following describes the working state of the first analog phase shift circuit 611, taking the radio frequency signal output by the first antenna ANT1 coupled to the first analog phase shift circuit 611 as a third radio frequency signal and the radio frequency signal output by the second antenna ANT2 as a fourth radio frequency signal as an example:

[0124] As shown in FIG. 7, in the first state, the first switch 715 couples the first output end of the radio frequency transceiver 303 to the first input end of the first quadrature coupler 712 through the first PA 711, and couples the first matching circuit 714 to the second input end of the first quadrature coupler 712. The second switch 716 couples the first output end of the first quadrature coupler 712 to the first antenna ANT1, and couples the output end of the first phase shifter 713 to the second antenna ANT2. Figure 8 At this time, the first input end of the first quadrature coupler 712 inputs a first radio frequency signal, which is output from the first output end of the first quadrature coupler 712 through a straight-through path between the first input end and the first output end to obtain a third radio frequency signal, assuming that the phase of the third radio frequency signal is 0 degrees. The first radio frequency signal is output from the second output end of the first quadrature coupler 712 through a coupling path between the first input end and the second output end to obtain a fourth radio frequency signal, and the phase of the fourth radio frequency signal is 90 degrees. After the first phase shifter 713 shifts the phase of the fourth radio frequency signal by 45 degrees, the phase of the fourth radio frequency signal is 135 degrees. Therefore, the phase difference between the final fourth radio frequency signal and the third radio frequency signal is 135-0=135 degrees.

[0125] As shown in FIG. 7, in the second state, the first switch 715 couples the first output end of the radio frequency transceiver 303 to the second input end of the first quadrature coupler 712 through the first PA 711, and couples the first matching circuit 714 to the first input end of the first quadrature coupler 712. The second switch 716 couples the first output end of the first quadrature coupler 712 to the first antenna ANT1, and couples the output end of the first phase shifter 713 to the second antenna ANT2.

[0126] Figure 9

[0127] ​​At this time, the first input end of the first quadrature coupler 712 inputs the first radio frequency signal, the first radio frequency signal is output from the second output end of the first quadrature coupler 712 through the through path between the second input end and the second output end to obtain the fourth radio frequency signal, and it is assumed that the phase of the fourth radio frequency signal is 0 degree. The first radio frequency signal is output from the first output end of the first quadrature coupler 712 through the coupling path between the second input end and the first output end to obtain the third radio frequency signal, and the phase of the third radio frequency signal is 90 degrees. After the fourth radio frequency signal is phase-shifted by 45 degrees by the first phase shifter 713, the phase of the fourth radio frequency signal is 45 degrees. Therefore, the phase difference between the final fourth radio frequency signal and the third radio frequency signal is 45-90=-45 degrees.

[0128] As shown in FIG. 7, in the third state, the first switch 715 couples the first output end of the radio frequency transceiver 303 to the first input end of the first quadrature coupler 712 through the first PA 711, and couples the first matching circuit 714 to the second input end of the first quadrature coupler 712. The second switch 716 couples the first output end of the first quadrature coupler 712 to the second antenna ANT2, and couples the output end of the first phase shifter 713 to the first antenna ANT1. Figure 10 At this time, the first input end of the first quadrature coupler 712 inputs the first radio frequency signal, the first radio frequency signal is output from the first output end of the first quadrature coupler 712 through the through path between the first input end and the first output end to obtain the fourth radio frequency signal, and it is assumed that the phase of the fourth radio frequency signal is 0 degree. The first radio frequency signal is output from the second output end of the first quadrature coupler 712 through the coupling path between the first input end and the second output end to obtain the third radio frequency signal, and the phase of the third radio frequency signal is 90 degrees. After the third radio frequency signal is phase-shifted by 45 degrees by the first phase shifter 713, the phase of the third radio frequency signal is 135 degrees. Therefore, the phase difference between the final fourth radio frequency signal and the third radio frequency signal is 0-135=-135 degrees.

[0129] As shown in FIG. 7, in the third state, the first switch 715 couples the first output end of the radio frequency transceiver 303 to the first input end of the first quadrature coupler 712 through the first PA 711, and couples the first matching circuit 714 to the second input end of the first quadrature coupler 712. The second switch 716 couples the first output end of the first quadrature coupler 712 to the second antenna ANT2, and couples the output end of the first phase shifter 713 to the first antenna ANT1.

[0130] Figure 11 As shown in FIG. 7, in the third state, the first switch 715 couples the first output end of the radio frequency transceiver 303 to the first input end of the first quadrature coupler 712 through the first PA 711, and couples the first matching circuit 714 to the second input end of the first quadrature coupler 712. The second switch 716 couples the first output end of the first quadrature coupler 712 to the second antenna ANT2, and couples the output end of the first phase shifter 713 to the first antenna ANT1.

[0131] ​At this time, a first radio frequency (RF) signal is input to the second input terminal of the first quadrature coupler 712. This first RF signal passes through a direct path between the second input terminal and the second output terminal and is output from the second output terminal of the first quadrature coupler 712 to obtain a third RF signal. Assume the phase of the third RF signal is 0 degrees. This first RF signal passes through a coupling path between the second input terminal and the first output terminal and is output from the first output terminal of the first quadrature coupler 712 to obtain a fourth RF signal. The phase of the fourth RF signal is then 90 degrees. After the third RF signal is further phase-shifted by the first phase shifter 713 by 45 degrees, its phase is 45 degrees. Therefore, the final phase difference between the fourth RF signal and the third RF signal is 90 - 45 = 45 degrees.

[0132] Based on the same principle, the operating state of the first analog phase shifting circuit 611 described above can also be applied to the operating state of the second analog phase shifting circuit 612. The operating state of the second analog phase shifting circuit 612 will be described below using the radio frequency signal output by the third antenna ANT3, coupled to the second analog phase shifting circuit 612, as the fifth radio frequency signal, and the radio frequency signal output by the fourth antenna ANT4, as the sixth radio frequency signal:

[0133] like Figure 12 As shown, in the fifth state, the third switch 725 couples the second output of the RF transceiver 303 to the first input of the second quadrature coupler 722 via the second PA 721, and couples the second matching circuit 724 to the second input of the second quadrature coupler 722. The fourth switch 726 couples the first output of the second quadrature coupler 722 to the third antenna ANT3, and couples the output of the second phase shifter 723 to the fourth antenna ANT4. Figure 8 Similarly, after the second radio frequency signal is input to the first input terminal of the second quadrature coupler 722, the phase difference between the sixth radio frequency signal and the fifth radio frequency signal can be 135 degrees.

[0134] like Figure 13 As shown, in the sixth state, the third switch 725 couples the second output of the RF transceiver 303 to the second input of the second quadrature coupler 722 via the second PA 721, and couples the second matching circuit 724 to the first input of the second quadrature coupler 722. The fourth switch 726 couples the first output of the second quadrature coupler 722 to the third antenna ANT3, and couples the output of the second phase shifter 723 to the fourth antenna ANT4. Figure 9 Similarly, after the second radio frequency signal is input to the second input terminal of the second quadrature coupler 722, the phase difference between the sixth radio frequency signal and the fifth radio frequency signal can be -45 degrees.

[0135] like Figure 14As shown, in the seventh state, the third switch 725 couples the second output of the RF transceiver 303 to the first input of the second quadrature coupler 722 via the second PA 721, and couples the second matching circuit 724 to the second input of the second quadrature coupler 722. The fourth switch 726 couples the first output of the second quadrature coupler 722 to the fourth antenna ANT4, and couples the output of the second phase shifter 723 to the third antenna ANT3. Figure 10 Similarly, after the second radio frequency signal is input to the first input terminal of the second quadrature coupler 722, the phase difference between the sixth radio frequency signal and the fifth radio frequency signal can be -135 degrees.

[0136] like Figure 15 As shown, in the eighth state, the third switch 725 couples the second output of the RF transceiver 303 to the second input of the second quadrature coupler 722 via the second PA 721, and couples the second matching circuit 724 to the first input of the second quadrature coupler 722. The fourth switch 726 couples the first output of the second quadrature coupler 722 to the fourth antenna ANT4, and couples the output of the second phase shifter 723 to the third antenna ANT3. Figure 11 Similarly, after the second radio frequency signal is input to the second input terminal of the second quadrature coupler 722, the phase difference between the sixth radio frequency signal and the fifth radio frequency signal can be 45 degrees.

[0137] It should be noted that the operating states of the first analog phase shifter circuit 611 and the second analog phase shifter circuit 612 are independent of each other. They can each achieve a 90-degree phase difference between four phases, and realize four phase differences between the radio frequency signals output by the two antennas: 45 degrees, 135 degrees (i.e., 45 degrees + 90 degrees), -45 degrees (equivalent to 45 degrees + 270 degrees), and -135 degrees (equivalent to 45 degrees + 180 degrees). When the phase shift angle of the first phase shifter 713 and the second phase shifter 723 is extended to α, the first analog phase shifter circuit 611 and the second analog phase shifter circuit 612 can respectively achieve phase differences of α degrees, α + 90 degrees, α + 180 degrees, and α + 270 degrees between the radio frequency signals transmitted by the two antennas.

[0138] It should also be noted that, for this radio frequency circuit, any state of the first analog phase shift circuit 611 can be combined with any state of the second analog phase shift circuit 612.

[0139] The radio frequency circuit provided in this application embodiment uses only one stage of quadrature coupler and phase shifter, which is relatively... Figure 4 The proposed solution exhibits lower insertion loss.

[0140] Considering that the communication device can also receive radio frequency signals, such as Figure 16As shown, the second switch 716 can also output the radio frequency signal RX1 received by the first antenna ANT1 and the radio frequency signal RX2 received by the second antenna ANT2 by adding more contacts, and the fourth switch 726 can also output the radio frequency signal RX3 received by the third antenna ANT3 and the radio frequency signal RX4 received by the fourth antenna ANT4 by adding more contacts.

[0141] In addition, as shown, the radio frequency circuit provided by the embodiment of the present application can further include a fifth switch 1701 and a sixth switch 1702, and the first switch 715, the second switch 716, the third switch 725 and the fourth switch 726 can add more contacts. Figure 17

[0142] In addition, as shown, the radio frequency circuit provided by the embodiment of the present application can further include a fifth switch 1701 and a sixth switch 1702, and the first switch 715, the second switch 716, the third switch 725 and the fourth switch 726 can add more contacts.

[0143] In addition, as shown, the radio frequency circuit provided by the embodiment of the present application can further include a fifth switch 1701 and a sixth switch 1702, and the first switch 715, the second switch 716, the third switch 725 and the fourth switch 726 can add more contacts.

[0144] In addition, as shown, the radio frequency circuit provided by the embodiment of the present application can further include a fifth switch 1701 and a sixth switch 1702, and the first switch 715, the second switch 716, the third switch 725 and the fourth switch 726 can add more contacts. Figure 18 ​As shown, the radio frequency circuit provided by the embodiment of the present application can further include a seventh switch 1703. In addition to outputting the third radio frequency signal RX3 received by the third antenna ANT3, the seventh switch 1703 and the fourth switch 726 can also couple the output end of the first PA 711 with the third antenna ANT3 and the fourth antenna ANT4 respectively when the first radio frequency signal is a sounding reference signal (SRS), that is, output the SRS through the third antenna ANT3 and the fourth antenna ANT4 respectively. Similarly, the first switch 715, the fifth switch 1701 and the second switch 716 can also couple the output end of the first PA 711 with the first antenna ANT1 and the second antenna ANT2 respectively, that is, output the SRS through the first antenna ANT1 and the second antenna ANT2 respectively. In this way, the four antennas can output the SRS in a polling manner, facilitating the base station to measure the uplink communication quality of the four wires of the communication device.

[0145] The embodiment of the present application also provides another radio frequency circuit, which designs the first analog phase shifter circuit and the second analog phase shifter circuit as a balanced power amplifier circuit. Compared with the scheme of Figures 7-18 , the insertion loss is smaller, which is expected to further optimize 0.3 dB, and the product area is smaller, saving the internal space of the communication device.

[0146] As shown in Figure 19 , the first analog phase shifter circuit 611 includes a first coupling device 1901, a first phase shifter 1902, a first PA 1903, a second PA 1904, a first combiner 1905, a first switch 1906 and a second switch 1907.

[0147] The first coupling device 1901 is used for coupling the first radio frequency signal to obtain the third radio frequency signal and the fourth radio frequency signal. The first coupling device 1901 can be a quadrature coupler, a power divider, a transformer or other devices that can couple one radio frequency signal to obtain two radio frequency signals.

[0148] The first phase shifter 1902 is used for analog phase shifting of the input radio frequency signal.

[0149] The first PA 1903 and the second PA 1904 are used for power amplification of the input radio frequency signal.

[0150] The first combiner 1905 is used for in-phase synthesis or differential synthesis of the two input radio frequency signals to obtain one radio frequency signal.

[0151] The first contact of the first switch 1906 is coupled to the first output terminal of the radio frequency transceiver 303, the second contact of the first switch 1906 is coupled to the first input terminal of the first coupling device 1901, the third contact of the first switch 1906 is coupled to the second output terminal of the radio frequency transceiver 303, the fourth contact of the first switch 1906 is coupled to the input terminal of the first PA 1903, the fifth contact of the first switch 1906 is coupled to the first output terminal of the first coupling device 1901, the sixth contact of the first switch 1906 is coupled to the second output terminal of the first coupling device 1901, and the seventh contact of the first switch 1906 is coupled to the input terminal of the second PA 1904. Specifically, the first contact of the first switch 1906 can be connected to the second or fourth contact, the fourth contact of the first switch 1906 can be connected to the first or fifth contact, the third contact of the first switch 1906 can be connected to the second or seventh contact, and the seventh contact of the first switch 1906 can be connected to the third or sixth contact.

[0152] The first contact of the second switch 1907 is coupled to the first antenna ANT1; the second contact of the second switch 1907 is coupled to the output of the first combiner 1905; the third contact of the second switch 1907 is coupled to the second antenna ANT2; the fourth contact of the second switch 1907 is coupled to the output of the first PA 1903; the fifth contact of the second switch 1907 is coupled to the first input of the first combiner 1905; the sixth contact of the second switch 1907 is coupled to the second input of the first combiner 1905; and the seventh contact of the second switch 1907 is coupled to the output of the second PA 1904. The first contact of the second switch 1907 can be connected to either the second or fourth contact; the fourth contact of the second switch 1907 can be connected to either the first or fifth contact; the third contact of the second switch 1907 can be connected to either the second or seventh contact; and the seventh contact of the second switch 1907 can be connected to either the third or sixth contact.

[0153] Optional, such as Figure 20 As shown, if the first coupling device 1901 is a first quadrature coupler 1901, the first analog phase shifting circuit 611 further includes a first matching circuit 1908, which is coupled to the second input terminal of the first quadrature coupler 1901. Additionally, Figure 21 The circuit structure of the first analog phase shift circuit 611 is shown when the first coupling device 1901 is the first power divider 1901.

[0154] like Figure 19 As shown, the second analog phase-shifting circuit 612 includes a second coupling device 1911, a second phase shifter 1912, a third PA 1913, a fourth PA 1914, a second combiner 1915, a third switch 1916, and a fourth switch 1917.

[0155] The second coupling device 1911 is configured to couple the second radio frequency signal to obtain a fifth radio frequency signal and a sixth radio frequency signal. The second coupling device 1911 can be a quadrature coupler, a power divider, a transformer, or any device capable of coupling one radio frequency signal to obtain two radio frequency signals.

[0156] The second phase shifter 1912 is configured to perform analog phase shift on the input radio frequency signal.

[0157] The third PA 1913 and the fourth PA 1914 are configured to perform power amplification on the input radio frequency signal.

[0158] The second combiner 1915 is configured to perform in-phase combination or differential combination on the two input radio frequency signals to obtain one radio frequency signal.

[0159] The first contact of the third switch 1916 is coupled to the third output terminal of the radio transceiver 303, the second contact of the third switch 1916 is coupled to the first input terminal of the second coupling device 1911, the third contact of the third switch 1916 is coupled to the fourth output terminal of the radio transceiver 303, the fourth contact of the third switch 1916 is coupled to the input terminal of the third PA 1913, the fifth contact of the third switch 1916 is coupled to the first output terminal of the second coupling device 1911, the sixth contact of the third switch 1916 is coupled to the second output terminal of the second coupling device 1911, and the seventh contact of the third switch 1916 is coupled to the input terminal of the fourth PA 1914. The first contact of the third switch 1916 can be conductive with the second contact or the fourth contact, the fourth contact of the third switch 1916 can be conductive with the first contact or the fifth contact, the third contact of the third switch 1916 can be conductive with the second contact or the seventh contact, and the seventh contact of the third switch 1916 can be conductive with the third contact or the sixth contact.

[0160] The first contact of the fourth switch 1917 is coupled to the third antenna ANT3, the second contact of the fourth switch 1917 is coupled to the output terminal of the second combiner 1915, the third contact of the fourth switch 1917 is coupled to the fourth antenna ANT4, the fourth contact of the fourth switch 1917 is coupled to the output terminal of the third PA 1913, the fifth contact of the fourth switch 1917 is coupled to the first input terminal of the second combiner 1915, the sixth contact of the fourth switch 1917 is coupled to the second input terminal of the second combiner 1915, and the seventh contact of the fourth switch 1917 is coupled to the output terminal of the fourth PA 1914. The first contact of the fourth switch 1917 can be conductive with the second contact or the fourth contact, the fourth contact of the fourth switch 1917 can be conductive with the first contact or the fifth contact, the third contact of the fourth switch 1917 can be conductive with the second contact or the seventh contact, and the seventh contact of the fourth switch 1917 can be conductive with the third contact or the sixth contact.

[0161] Optional, such as Figure 20 As shown, if the second coupling device 1911 is a second quadrature coupler 1911, the second analog phase-shifting circuit 612 further includes a second matching circuit 1918, which is coupled to the second input terminal of the second quadrature coupler 1911. Additionally, Figure 21 The circuit structure of the second analog phase shift circuit 612 is shown when the second coupling device 1911 is the second power divider 1911.

[0162] The operating state of the first analog phase-shifting circuit 611 is described below:

[0163] like Figure 22 As shown, in the first state, the first switch 1906 couples the first output terminal of the RF transceiver 303 to the first input terminal of the first coupling device 1901, couples the first output terminal of the first coupling device 1901 to the input terminal of the first PA 1903, and couples the output terminal of the first phase shifter 1902 to the input terminal of the second PA 1904. The second switch 1907 couples the output terminal of the first PA 1903 to the first input terminal of the first combiner 1905, couples the output terminal of the second PA 1904 to the second input terminal of the first combiner 1905, and couples the output terminal of the first combiner 1905 to the first antenna ANT1.

[0164] At this time, the first coupling device 1901 splits the radio frequency signal output from the first output terminal of the radio frequency transceiver 303 into two radio frequency signals. One of them is phase-shifted by the first phase shifter 1902. The two radio frequency signals are then amplified by the PA (Power Amplifier). The first combiner 1905 combines the two radio frequency signals. If the phase shift of the first phase shifter 1902 is zero, the first combiner 1905 combines the two radio frequency signals in phase. If the phase shift of the first phase shifter 1902 is not zero, the first combiner 1905 combines the two radio frequency signals differentially. This enables high-power transmission of a single data stream.

[0165] like Figure 23 As shown, in the second state, the first switch 1906 couples the first output terminal of the RF transceiver 303 to the first input terminal of the first coupling device 1901, couples the first output terminal of the first coupling device 1901 to the input terminal of the first PA 1903, and couples the output terminal of the first phase shifter 1902 to the input terminal of the second PA 1904. The second switch 1907 couples the output terminal of the first PA 1903 to the first antenna ANT1, and couples the output terminal of the second PA 1904 to the second antenna ANT2.

[0166] At this time, the first coupling device 1901 divides the first radio frequency signal output by the first output end of the radio frequency transceiver 303 into a third radio frequency signal and a fourth radio frequency signal, the third radio frequency signal is power amplified by the first PA 1903, and the fourth radio frequency signal is power amplified by the second PA 1904 after being phase-shifted by the first phase shifter 1902. The two radio frequency signals are respectively transmitted by the two antennas, and analog beamforming can be realized.

[0167] As shown in FIG. 6, in the third state, the first switch 1906 couples the first output end of the radio frequency transceiver 303 to the input end of the first PA 1903 and couples the second output end of the radio frequency transceiver 303 to the input end of the second PA 1904. The second switch 1907 couples the output end of the first PA 1903 to the first antenna ANT1 and couples the output end of the second PA 1904 to the second antenna ANT2. Figure 24 At this time, the radio frequency signal output by the first output end of the radio frequency transceiver 303 is transmitted by the first antenna ANT1 after power amplification, and the radio frequency signal output by the second output end of the radio frequency transceiver 303 is transmitted by the second antenna ANT2 after power amplification, and two data streams can be independently transmitted.

[0168] Based on the same principle, the working state of the first analog phase shift circuit 611 described above can also be applied to the working state of the second analog phase shift circuit 612. The working state of the second analog phase shift circuit 612 is described as follows:

[0169] As shown in FIG. 7, in the fourth state, the third switch 1916 couples the third output end of the radio frequency transceiver 303 to the first input end of the second coupling device 1911, couples the first output end of the second coupling device 1911 to the input end of the third PA 1913, and couples the output end of the second phase shifter 1912 to the input end of the fourth PA 1914. The fourth switch 1917 couples the output end of the third PA 1913 to the first input end of the second combiner 1915, couples the output end of the fourth PA 1914 to the second input end of the second combiner 1915, and couples the output end of the second combiner 1915 to the third antenna ANT3.

[0170] Figure 25 At this time, the radio frequency signal output by the third output end of the radio frequency transceiver 303 is transmitted by the third antenna ANT3 after power amplification, and the radio frequency signal output by the fourth output end of the radio frequency transceiver 303 is transmitted by the fourth antenna ANT4 after power amplification, and two data streams can be independently transmitted.

[0171] ​At this point, the second coupling device 1911 splits the RF signal output from the third output terminal of the RF transceiver 303 into two RF signals. One of these signals undergoes phase shifting by the second phase shifter 1912. Both RF signals are then amplified by the power amplifier (PA) and combined by the second combiner 1915. If the phase shift of the second phase shifter 1912 is zero, the second combiner 1915 performs in-phase combining of the two RF signals; if the phase shift of the second phase shifter 1912 is not zero, the second combiner 1915 performs differential combining of the two RF signals. This enables high-power transmission of a single data stream.

[0172] like Figure 26 As shown, in the fifth state, the third switch 1916 couples the third output of the RF transceiver 303 to the first input of the second coupler 1911, couples the first output of the second coupler 1911 to the input of the third PA 1913, and couples the output of the second phase shifter 1912 to the input of the fourth PA 1914. The fourth switch 1917 couples the output of the third PA 1913 to the third antenna ANT3, and couples the output of the fourth PA 1914 to the fourth antenna ANT4.

[0173] At this time, the second coupling device 1911 divides the second radio frequency signal output from the third output terminal of the radio frequency transceiver 303 into a fifth radio frequency signal and a sixth radio frequency signal. The fifth radio frequency signal is amplified by the third PA 1913, and the sixth radio frequency signal is phase-shifted by the second phase shifter 1912 and then amplified by the fourth PA 1914. These two radio frequency signals are transmitted through two antennas respectively, which can realize simulated beamforming.

[0174] like Figure 27 As shown, in the sixth state, the third switch 1916 couples the third output of the RF transceiver 303 to the input of the third PA 1913, and couples the fourth output of the RF transceiver 303 to the input of the fourth PA 1914. The fourth switch 1917 couples the output of the third PA 1913 to the third antenna ANT3, and couples the output of the fourth PA 1914 to the fourth antenna ANT4.

[0175] At this time, the radio frequency signal output from the third output terminal of the radio frequency transceiver 303 is amplified and then transmitted through the third antenna ANT3, and the radio frequency signal output from the fourth output terminal of the radio frequency transceiver 303 is amplified and then transmitted through the fourth antenna ANT4, thus enabling the independent transmission of two data streams.

[0176] Considering that the communication device can also receive radio frequency signals, such as Figure 28As shown, the second switch 1917 can also output the radio frequency signal RX1 received by the first antenna ANT1 and the radio frequency signal RX2 received by the second antenna ANT2 by adding more contacts, and the fourth switch 1915 can also output the radio frequency signal RX3 received by the third antenna ANT3 and the radio frequency signal RX4 received by the fourth antenna ANT4 by adding more contacts.

[0177] It should be noted that for the radio frequency circuit, the first state of the first analog phase shift circuit 611 can be combined with the fourth state of the second analog phase shift circuit 612, the second state of the first analog phase shift circuit 611 can be combined with the fifth state of the second analog phase shift circuit 612, and the third state of the first analog phase shift circuit 611 can be combined with the sixth state of the second analog phase shift circuit 612.

[0178] The working process of the communication device provided by the embodiment of the present application for hybrid beamforming is as follows:

[0179] Before the communication device communicates with the base station, the communication device receives the downlink reference signal through the first antenna to the fourth antenna respectively, and sends the processed signal to the DBB processor after the radio frequency transceiver processing. The DBB processor performs downlink channel estimation according to the demodulated signal, and calculates the preferred phase shifting direction, calculates the preferred phase of the first radio frequency signal and the second radio frequency signal according to the preferred phase shifting direction (at this time, the phase error of the first radio frequency signal and the second radio frequency signal needs to be corrected) and performs digital phase shift. The DBB processor also calculates the preferred phase of the third radio frequency signal, the fourth radio frequency signal, the fifth radio frequency signal and the sixth radio frequency signal according to the preferred phase shifting direction, and sends a control signal to the first analog phase shift circuit and the second analog phase shift circuit. The control signal is used to configure the preferred phase of the third radio frequency signal, the fourth radio frequency signal, the fifth radio frequency signal and the sixth radio frequency signal to realize analog phase shift, the power of the first radio frequency signal is proportionally distributed to the third radio frequency signal and the fourth radio frequency signal, and the power of the second radio frequency signal is proportionally distributed to the fifth radio frequency signal and the sixth radio frequency signal. The control signal is also used to control the switches in the first analog phase shift circuit and the second analog phase shift circuit to select the path (for example, to select the receive signal path or the transmit signal path), so as to distribute the radio frequency signal to each antenna for transmission. The control signal can be a mobile industry processor interface (MIPI) signal, a general-purpose input / output (GPIO) signal, a service provider interface (SPI) signal, etc.

[0180] The above-mentioned radio frequency circuit and communication device provided by the embodiments of the present application, the radio frequency circuit includes two analog phase shift circuits, each analog phase shift circuit couples two radio frequency signals from the input radio frequency signal, and at least one of the two radio frequency signals is analog phase shifted, the two analog phase shift circuits output four radio frequency signals and are transmitted through four antennas respectively, the two analog phase shift circuits realize analog beam forming, and the radio frequency signal input by each analog phase shift circuit has different phases after being analog phase shifted in advance, and the whole radio frequency circuit realizes hybrid beam forming of two transmission channels and four antennas. Compared with the scheme shown in the prior art, only two analog phase shift circuits are needed to realize the transmission of four radio frequency signals, thereby reducing the hardware cost and volume of the communication device. Since the range of digital phase shift can be adjusted arbitrarily, the range of analog phase shift is not limited, so that the beam forming benefit can reach the theoretical limit of 6dB. Figure 3

[0181] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and actual implementation can be in another division manner, for example, a plurality of modules or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed modules can be indirect coupling or communication connection through some interface, device or module, and can be electrical, mechanical or other forms.

[0182] The modules described as separate components can or can not be physically separate, and the components shown as modules can or can not be physical modules, that is, they can be located in one device or distributed in multiple devices. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0183] In addition, the functional modules in each embodiment of the present application can be integrated in one device, or each module can be physically present alone, or two or more modules can be integrated in one device.

[0184] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A radio frequency circuit, characterized in that, include: First analog phase-shifting circuit, second analog phase-shifting circuit; The first analog phase-shifting circuit receives a first radio frequency signal and outputs a third radio frequency signal and a fourth radio frequency signal. After performing analog phase shifting on at least one of the third radio frequency signal and the fourth radio frequency signal, the first analog phase-shifting circuit outputs the third radio frequency signal and the fourth radio frequency signal. The second analog phase-shifting circuit receives the second radio frequency signal and outputs the fifth radio frequency signal and the sixth radio frequency signal. After performing analog phase shifting on at least one of the fifth radio frequency signal and the sixth radio frequency signal, the second analog phase-shifting circuit outputs the fifth radio frequency signal and the sixth radio frequency signal. The first radio frequency signal and the second radio frequency signal have different phases; The first analog phase-shifting circuit includes a first power amplifier, a first switch, a fifth switch, and a second switch; the first radio frequency signal is input to the input terminal of the first power amplifier. When the first radio frequency signal is a detection reference signal, the first switch, the fifth switch, and the second switch couple the output terminal of the first power amplifier to the first antenna and the second antenna, respectively. The second analog phase-shifting circuit includes a seventh switch and a fourth switch; when the first radio frequency signal is a detection reference signal, the first switch, the seventh switch, and the fourth switch couple the output terminal of the first power amplifier to the third antenna and the fourth antenna, respectively.

2. The radio frequency circuit according to claim 1, characterized in that, The first analog phase-shifting circuit includes a first quadrature coupler and a first phase shifter. The first input terminal and the first output terminal of the first quadrature coupler are a direct path, the first input terminal and the second output terminal are a coupling path, the second input terminal and the second output terminal are a direct path, and the second input terminal and the first output terminal are a coupling path. The second output terminal of the first quadrature coupler is coupled to the input terminal of the first phase shifter; The first radio frequency signal is input to the first input terminal or the second input terminal of the first quadrature coupler, the third radio frequency signal is output to the first output terminal of the first quadrature coupler, and the fourth radio frequency signal is output to the second output terminal of the first quadrature coupler; or, the fourth radio frequency signal is output to the first output terminal of the first quadrature coupler, and the third radio frequency signal is output to the second output terminal of the first quadrature coupler.

3. The radio frequency circuit according to claim 2, characterized in that, The first analog phase-shifting circuit includes a first matching circuit. The first switch couples the output of the first power amplifier to the first input of the first quadrature coupler and couples the first matching circuit to the second input of the first quadrature coupler. Alternatively, the first switch couples the output of the first power amplifier to the second input of the first quadrature coupler and couples the first matching circuit to the first input of the first quadrature coupler. The second switch couples the first output terminal of the first quadrature coupler to the first antenna and the output terminal of the first phase shifter to the second antenna; or, the second switch couples the first output terminal of the first quadrature coupler to the second antenna and the output terminal of the first phase shifter to the first antenna.

4. The radio frequency circuit according to claim 3, characterized in that, The second analog phase-shifting circuit includes a second quadrature coupler and a second phase shifter. The first input terminal and the first output terminal of the second quadrature coupler are connected in a direct path, and the first input terminal and the second output terminal are connected in a coupling path. The second input terminal and the second output terminal are connected in a direct path, and the second input terminal and the first output terminal are connected in a coupling path. The second output terminal of the second quadrature coupler is coupled to the input terminal of the second phase shifter. The second radio frequency signal is input to the first or second input terminal of the second quadrature coupler, the fifth radio frequency signal is output to the first output terminal of the second quadrature coupler, and the sixth radio frequency signal is output to the second output terminal of the second quadrature coupler; or, the sixth radio frequency signal is output to the first output terminal of the second quadrature coupler, and the fifth radio frequency signal is output to the second output terminal of the second quadrature coupler.

5. The radio frequency circuit according to claim 4, characterized in that, The second analog phase-shifting circuit further includes a second power amplifier, a second matching circuit, a third switch, and a fourth switch; the second radio frequency signal is input to the input terminal of the second power amplifier; The third switch couples the output of the second power amplifier to the first input of the second quadrature coupler and couples the second matching circuit to the second input of the second quadrature coupler; or, the third switch couples the output of the second power amplifier to the second input of the second quadrature coupler and couples the second matching circuit to the first input of the second quadrature coupler. The fourth switch couples the first output terminal of the second quadrature coupler to the third antenna and the output terminal of the second phase shifter to the fourth antenna; or, the second switch couples the first output terminal of the second quadrature coupler to the fourth antenna and the output terminal of the second phase shifter to the third antenna.

6. The radio frequency circuit according to claim 5, characterized in that, The second analog phase-shifting circuit also includes a sixth switch. The sixth switch, the third switch, and the fourth switch also couple the output of the second power amplifier to the third antenna or the fourth antenna.

7. A communication device, characterized in that, The system includes a radio frequency (RF) circuit and an RF signal generation circuit as described in any one of claims 1-6, wherein the RF signal generation circuit outputs a first RF signal and a second RF signal to the RF circuit, the first RF signal and the second RF signal having different phases; the RF circuit outputs a third RF signal, a fourth RF signal, a fifth RF signal, and a sixth RF signal, wherein the third RF signal and the fourth RF signal are obtained from the first RF signal, and the third RF signal and the fourth RF signal have different phases; the fifth RF signal and the sixth RF signal are obtained from the second RF signal, and the fifth RF signal and the sixth RF signal have different phases.

8. The communication device according to claim 7, characterized in that, The radio frequency signal generation circuit is a chip, or includes a digital baseband processor and a radio frequency transceiver.

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