Phase shift circuit, antenna feeding control method, radio frequency front-end module and electronic device

Abstract

The present application discloses a phase shift circuit, an antenna feed control method, a radio frequency front-end module and an electronic device, which relate to the radio frequency field and are used to reduce the loss of the phase shift circuit. The phase shift circuit includes: a multi-open switch, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor; the multi-open switch includes a first fixed end, a first active end, a second active end, a third active end, a fourth active end and a fifth active end; the first fixed end is connected to at least two active ends of the multiple active ends; the first active end is connected to the first end of the first inductor, the second active end is connected to the first end of the first capacitor, the third active end is connected to the first end of the third capacitor, the fourth active end is connected to the first end of the second capacitor, and the fifth active end is connected to the first end of the second inductor; the second end of the first inductor is connected to the second end of the first capacitor; the second end of the second inductor is connected to the second end of the second capacitor; the second end of the third capacitor is grounded.

Description

Technical Field

[0001] The present application relates to the field of radio frequency, and in particular to a phase shift circuit, an antenna feeding control method, a radio frequency front-end module and an electronic device. Background Art

[0002] Feeding two antennas simultaneously can improve antenna efficiency, but the phase of the signals emitted by the two antennas needs to be adjusted through a phase shift circuit. Antenna efficiency refers to the ratio of the power radiated by the antenna (that is, the power effectively converted into electromagnetic waves) to the power input to the antenna. If the loss caused by the phase shift circuit is too high, the efficiency of the antenna will be reduced. Summary of the invention

[0003] Embodiments of the present application provide a phase shift circuit, an antenna feed control method, a radio frequency front-end module, and an electronic device for reducing the loss of the phase shift circuit.

[0004] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0005] In the first aspect, a phase shift circuit is provided, including: a multi-open switch, a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor; the multi-open switch includes a first fixed end and multiple active ends, and the multiple active ends include a first active end, a second active end, a third active end, a fourth active end, and a fifth active end; the first fixed end can be connected to at least two active ends of the multiple active ends; the first active end is connected to the first end of the first inductor, the second active end is connected to the first end of the first capacitor, the third active end is connected to the first end of the third capacitor, the fourth active end is connected to the first end of the second capacitor, and the fifth active end is connected to the first end of the second inductor; the second end of the first inductor is connected to the second end of the first capacitor at a first connection point, and the first connection point is used to connect to the first antenna; the second end of the second inductor is connected to the second end of the second capacitor at a second connection point, and the second connection point is used to connect to the second antenna; the second end of the third capacitor is grounded.

[0006] In the phase shift circuit provided by the embodiment of the present application, the first fixed end of the multi-open switch can be connected to at least two of the multiple active ends, some of the active ends are connected to the antenna through a capacitor or an inductor, and some of the active ends are grounded through a capacitor. The inductor and the capacitor can realize the phase shift of the radio frequency signal, and the phase shift can be adjustable with the different conduction states of the multi-open switch. In addition, the loss of the switch, capacitor, and inductor itself is very small, and accordingly, the loss of the phase shift circuit formed is also very small, which helps to improve the efficiency of the antenna.

[0007] In a possible implementation, in the first state, the first fixed end is connected to the first movable end and the fourth movable end. The RF signal output by the fourth movable end has a phase difference within a preset angle range (eg, 60 to 120 degrees) relative to the RF signal output by the first movable end.

[0008] In a possible implementation, in the second state, the first fixed end is connected to the second movable end and the fifth movable end. The phase difference of the RF signal output by the fifth movable end relative to the RF signal output by the second movable end is within a preset angle range (eg, -60 degrees to -120 degrees).

[0009] In a possible implementation, in the third state, the first fixed end is connected to the first movable end, the third movable end and the fifth movable end. The radio frequency signal output by the fifth movable end is in phase with the radio frequency signal output by the first movable end.

[0010] In a possible implementation, the multi-open switch further includes a second fixed end, the second fixed end is grounded, and in the fourth state, the second fixed end is connected to the second movable end, and the first fixed end is connected to the first movable end and the third movable end. A single antenna transmits a radio frequency signal, and the phase difference of the radio frequency signal transmitted by the antenna relative to the radio frequency signal input by the first fixed end is within a preset angle range (e.g., -60 degrees to -120 degrees).

[0011] In a possible implementation, the multi-open switch further includes a second fixed end, the second fixed end is grounded, and in the fifth state, the second fixed end is connected to the fourth active end, and the first fixed end is connected to the third active end and the fifth active end. A single antenna transmits a radio frequency signal, and the phase difference of the radio frequency signal transmitted by the antenna relative to the radio frequency signal input by the first fixed end is within a preset angle range (e.g., -60 degrees to -120 degrees).

[0012] In a possible implementation, the multi-open switch further includes a third fixed end and a grounded second fixed end, the circuit further includes a third inductor and a fourth capacitor, and the multiple active ends further include a sixth active end; the sixth active end is connected to the first end of the third inductor, the second end of the third inductor is connected to the third fixed end and the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded. The inductor is connected in series between the first ends of the two capacitors, the second ends of the two capacitors are both grounded, the first end of one capacitor is used as the input end, and the first end of the other capacitor is used as the output end, so that the phase difference of the output end relative to the input end can be within a preset angle range (e.g., -60 degrees to -120 degrees).

[0013] In a possible implementation, in the sixth state, the first fixed end is connected to the sixth movable end and the fourth movable end, the second fixed end is connected to the second movable end, and the third fixed end is connected to the first movable end. The fourth movable end has a phase difference within a preset angle range (e.g., 150 to 210 degrees) relative to the first movable end.

[0014] In a possible implementation, in the seventh state, the first fixed end is connected to the sixth movable end and the second movable end, the second fixed end is connected to the fourth movable end, and the third fixed end is connected to the fifth movable end. The phase difference of the second movable end relative to the fifth movable end is within a preset angle range (e.g., 150 degrees to 210 degrees).

[0015] In a possible implementation, the capacitance value of the capacitor satisfies The inductance value of the inductor satisfies Among them, Z 0 represents characteristic impedance, and ω represents the frequency of the transmitted RF signal. When the above-mentioned capacitor and inductor meet the conditions of this implementation, a phase shift of a multiple of a preset angle range (eg, 60 degrees to 120 degrees) can be achieved.

[0016] In a second aspect, an antenna feed control method is provided, which is applied to the phase shift circuit as described in the first aspect and any embodiment thereof, the method comprising: detecting the distance between a target antenna among multiple antennas and a human body; if the distance between the target antenna and the human body is less than or equal to a threshold, controlling a multi-open switch in the phase shift circuit to disconnect the path of the target antenna; if the distance between the target antenna and the human body is greater than the threshold, controlling the multi-open switch to turn on the path of the target antenna.

[0017] In a possible implementation, a specific absorption rate (SAR) sensor is provided within a preset distance of the target antenna to detect the distance between the target antenna among multiple antennas and the human body, including: detecting the SAR by the SAR sensor to detect the distance between the target antenna and the human body.

[0018] In a possible implementation, the target area of ​​the touch screen is within a preset distance of the target antenna, and the distance between the target antenna among the multiple antennas and the human body is detected, including: detecting whether the human body is in contact with the target area through the touch screen to detect the distance between the target antenna and the human body.

[0019] In a possible implementation, the target is connected to an impedance detection chip to detect the distance between the target antenna among multiple antennas and the human body, including: detecting the impedance of the target antenna by the impedance detection chip to detect the distance between the target antenna and the human body.

[0020] In a third aspect, a radio frequency front-end module is provided, including an amplifier and a phase shift circuit as in the first aspect and any embodiment thereof, wherein the amplifier is connected to the phase shift circuit.

[0021] In a fourth aspect, an electronic device is provided, comprising a processor, multiple antennas, and a phase shifting circuit as described in the first aspect and any embodiment thereof, wherein the phase shifting circuit is connected to the multiple antennas, and the processor is used to control the phase shifting circuit to feed at least one of the multiple antennas.

[0022] In a fifth aspect, a computer-readable storage medium is provided, comprising instructions, which, when executed on an electronic device, causes the electronic device to execute the method as described in the first aspect and any embodiment thereof, or to execute the method as described in the second aspect and any embodiment thereof.

[0023] In a sixth aspect, a computer program product comprising instructions is provided. When the instructions are executed on the above-mentioned electronic device, the electronic device executes the method as described in the first aspect and any embodiment thereof, or executes the method as described in the second aspect and any embodiment thereof.

[0024] The technical effects of the second to sixth aspects refer to the technical effects of the first aspect and any of its embodiments, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a Smith chart provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of a mobile communication module provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of an electronic device provided in an embodiment of the present application in free space, right-hand holding, and left-hand holding scenarios;

[0030] Figure 6 A schematic diagram of simulation of an electronic device in free space, right-hand holding, and left-hand holding scenarios provided by an embodiment of the present application;

[0031] Figure 7 A schematic diagram of a first phase shift circuit provided in an embodiment of the present application;

[0032] Figure 8A schematic diagram of a Smith chart, phase difference, and antenna efficiency of a first phase shift circuit provided in an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of a second phase shift circuit provided in an embodiment of the present application;

[0034] Fig.10 A schematic diagram of a Smith chart, phase difference, and antenna efficiency of a second phase shift circuit provided in an embodiment of the present application;

[0035] Fig.11 A schematic diagram of a third phase shift circuit provided in an embodiment of the present application;

[0036] Fig.12 A schematic diagram of a Smith chart, phase difference, and antenna efficiency of a third phase shift circuit provided in an embodiment of the present application;

[0037] Fig.13 A schematic diagram of the structure of a radio frequency front-end module including a phase shifting circuit provided in an embodiment of the present application;

[0038] Fig.14 A schematic diagram of the conduction state of multiple switches in the first phase shift circuit provided in an embodiment of the present application;

[0039] Fig.15 A schematic diagram of the conduction state of multiple switches in the second phase-shifting circuit provided in an embodiment of the present application;

[0040] Fig.16 A schematic diagram of the conduction state of multiple switches in the third phase shift circuit provided in an embodiment of the present application;

[0041] Fig.17 A schematic diagram of the conduction state of multiple switches in the fourth phase-shifting circuit provided in an embodiment of the present application;

[0042] Fig.18 A schematic diagram of the conduction state of multiple switches in the fifth phase-shifting circuit provided in an embodiment of the present application;

[0043] Fig.19 A schematic structural diagram of another radio frequency front-end module including a phase shifting circuit provided in an embodiment of the present application;

[0044] Fig. 20 A schematic diagram of the conduction state of multiple switches in the sixth phase-shifting circuit provided in an embodiment of the present application;

[0045] Fig.21 A schematic diagram of the conduction state of multiple switches in the seventh phase-shifting circuit provided in an embodiment of the present application;

[0046] Fig. 22A schematic diagram of antenna directional patterns corresponding to different conduction states of a multi-open switch provided in an embodiment of the present application;

[0047] Fig.23 A schematic diagram of an antenna feed control method provided in an embodiment of the present application;

[0048] Fig.24 A schematic diagram of the structure of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] First, some concepts involved in this application are described.

[0050] The terms "first", "second", etc. involved in the embodiments of the present application are only used to distinguish features of the same type and cannot be understood as indicating relative importance, quantity, order, etc.

[0051] The terms "exemplary" or "for example" and the like in the embodiments of the present application are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the related concepts in a specific way.

[0052] The terms "coupling" and "connection" involved in the embodiments of the present application should be understood in a broad sense. For example, they may refer to a direct physical connection, or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0053] Scattering parameter (abbreviated as S parameter): S parameter S(b,a) represents the output signal at the output end b of the transmission line (the complex vector Z b ) and the input signal at the input terminal a (complex vector Z a ) b / Z a , a and b can be the same or different. When a and b are the same, the S parameter S(b,a) represents the reflection coefficient, that is, how much energy is reflected back to the source end. The smaller the value of the reflection coefficient, the better, indicating that less energy is reflected back to the source end. When a and b are different, the S parameter S(b,a) represents the transmission coefficient, that is, how much energy is transmitted to the destination end. The larger the value of the transmission coefficient, the higher the signal transmission efficiency. For example, assuming that port 1 is the input end of the signal and port 2 and port 3 are the output ends of the signal, then S(1,1) (can be abbreviated as S11) represents the reflection coefficient, S(2,1) (can be abbreviated as S21) and S(3,1) (can be abbreviated as S31) represent the transmission coefficient.

[0054] Since the complex vector Z of the signal can be represented by the exponent Ae including the amplitude A and the phase θ iθ So the S parameter can be expressed as The S parameter describes the phase difference (θ) of the signal at the output end b of the transmission line relative to the signal at the input end a. b -θ a ) and efficiency (A b / A a ), efficiency (A b / A a ) is essentially the amplitude change of the signal at the output end b of the transmission line relative to the signal at the input end a. In this application, the phase difference (S(b,a)) is used to represent the phase difference θ b -θ a , efficiency (A) is expressed in dB(S(b,a)) b / A a ) converted to dB domain value 20log(A b / A a ).

[0055] Smith chart: Figure 1 As shown in Figure 1, the Smith chart is a calculation chart with normalized impedance equal value circles marked on the reflection coefficient plane, which is mainly used for impedance matching of transmission lines. The Smith chart includes equal reflection coefficient circles, equal resistance circles, and equal reactance circles. The equal reflection coefficient circles are drawn according to the following formula 1.

[0056]

[0057] Where Γ is the reflection coefficient S11 in the S parameter mentioned above, z = Z L / Z 0 represents the normalized impedance, Z L is the load impedance of the transmission line, Z 0 is the characteristic impedance of the transmission line, usually 50Ω. The reflection coefficient Γ is expressed in the form Γ = Γ u +iΓ v , the horizontal axis Γ u represents the real part, the ordinate Γ v Represents the imaginary part. On the same equal reflection coefficient circle, the modulus |Γ| of the reflection coefficient Γ is equal.

[0058] If the impedance z is also expressed in complex form z = r + jx, where r is the resistance and x is the reactance, combined with formula 1 and Γ = Γ u +iΓ v , we can get Formula 2 and Formula 3.

[0059]

[0060]

[0061] Formula 2 represents the equal resistance circle. The coordinates of the center of the equal resistance circle are (r / (r+1), 0), and the radius is 1 / (r+1). On the same equal resistance circle, the resistance is equal and is r. All equal resistance circles pass through the coordinate point (1, 0). The larger the resistance r, the smaller the radius of the corresponding equal resistance circle. The range of resistance r is 0≤r<∞.

[0062] Formula 3 represents the iso-reactance circle. The coordinates of the center of the iso-reactance circle are (1,1 / x), and the radius is 1 / x. On the same iso-reactance circle, the reactance is equal and is x. Positive x indicates inductance, and negative x indicates capacitance, so there are two sets of iso-reactance circles, and all are through the coordinate point (1,0).

[0063] When merging equal reflection coefficient circles, equal resistance circles and equal reactance circles into the Smith chart, for equal reflection coefficient circles, usually only the equal reflection coefficient circle with the largest |Γ|=1 is retained, and for equal resistance circles and equal reactance circles, only the circles intersecting with the equal reflection coefficient circle with |Γ|=1 are retained.

[0064] The most ideal impedance matching refers to the load impedance Z of the transmission line. L The characteristic impedance Z of the transmission line 0 =Equal, the transmission line will not generate reflection, and all the energy of the signal transmitted by the transmission line is absorbed by the load. According to Formula 1, the most ideal impedance matching corresponds to the (0,0) coordinate point in the Smith chart.

[0065] The embodiment of the present application provides an electronic device, which is an electronic device with a wireless communication function. The electronic device can be mobile or fixed. The electronic device can be deployed on land (for example, indoors or outdoors, handheld or vehicle-mounted, etc.), can be deployed on the water (for example, ships, etc.), and can also be deployed in the air (for example, airplanes, balloons, and satellites, etc.). The electronic device can be called user equipment (UE), access terminal, terminal unit, subscriber unit, terminal station, mobile station (MS), mobile station, terminal agent or terminal device, etc. For example, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a smart bracelet, a smart screen, a smart watch, a virtual reality (VR) device, an augmented reality (AR) device, a terminal in industrial control, a terminal in self-driving, a terminal in remote medical, a terminal in smart grid, a terminal in transportation safety, a terminal in smart city, a terminal in smart home, etc. The embodiments of the present application do not limit the specific type and structure of the electronic device. A possible structure of the electronic device is described below.

[0066] Taking a mobile phone as an example, Figure 2 A possible structure of the electronic device 101 is shown. The electronic device 101 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, an antenna 1, an 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, an earphone interface 270D, a sensor module 280, a button 290, a motor 291, an indicator 292, a camera 293, a display screen 294, and a subscriber identification module (SIM) card interface 295. Optionally, in some embodiments, an audio digital signal processor (ADSP) 243 is also included.

[0067] It is understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 101. In other embodiments of the present application, the electronic device 101 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0068] The processor 210 may include one or more processing units, for example, the processor 210 may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processing unit (CPU), an application processor (AP), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, and a neural-network processing unit (NPU). Among them, different processing units may be independent devices or integrated into one or more processors. For example, the processor 210 may be an application processor AP. Alternatively, the processor 210 may be integrated into a system on chip (SoC). Alternatively, the processor 210 may be integrated into an integrated circuit (IC) chip. The processor 210 may include an analog front end (AFE) and a micro-controller unit (MCU) in an IC chip.

[0069] The processor 210 executes the antenna feeding control method provided in the embodiment of the present application by executing the program and computer instructions stored in the internal memory 221.

[0070] The processor 210 may also be provided with a memory for storing computer instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. The memory may store computer instructions or data that the processor 210 has just used or circulated. If the processor 210 needs to use the computer instructions or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 210, and thus improves the efficiency of the system.

[0071] In some embodiments, the processor 210 may include one or more interfaces. The interface may 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.

[0072] ADSP 243 can be coupled with audio module 270 and sensor module 280, and ADSP 243 can be used to process audio signals and sensor data. When the processor is in a dormant state, ADSP 243 can still keep working, thereby reducing the power consumption of the electronic device.

[0073] It is understandable that the interface connection relationship between the modules illustrated in the embodiment of the present application is only a schematic illustration and does not constitute a structural limitation on the electronic device 101. In other embodiments of the present application, the electronic device 101 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0074] The external memory interface 220 can be used to connect an external memory card, such as a micro SanDisk (Micro SD) card, to expand the storage capacity of the electronic device 101. The external memory card communicates with the processor 210 through the external memory interface 220 to implement a data storage function, such as storing music, video and other files in the external memory card.

[0075] The internal memory 221 may be used to store computer executable program codes, which include computer instructions. The processor 210 executes various functional applications and data processing of the electronic device 101 by running the computer instructions stored in the internal memory 221. In addition, the internal memory 221 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0076] The memory involved in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0077] The electronic device 101 can implement audio functions such as music playing and recording through the audio module 270, the speaker 270A, the receiver 270B, the microphone 270C, the headphone interface 270D and the application processor.

[0078] The audio module 270 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal. In some embodiments, the audio module 270 can be arranged in the processor 210, or some functional modules of the audio module 270 can be arranged in the processor 210. The speaker 270A, also known as the "speaker", is used to convert the audio electrical signal into a sound signal. The receiver 270B, also known as the "earpiece", is used to convert the audio electrical signal into a sound signal. The microphone 270C, also known as the "microphone", is used to convert the sound signal into an electrical signal. The electronic device 101 can be provided with at least one microphone 270C. The headphone interface 270D is used to connect a wired headset. The headphone interface 270D can be a USB interface 230, or it can be a 3.5mm open mobile terminal platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface.

[0079] The button 290 includes a power button, a volume button, etc. The button 290 may be a mechanical button. It may also be a touch button. The electronic device 101 may receive a button input and generate a key signal input related to the user settings and function control of the electronic device 101. The motor 291 may generate a vibration prompt. The motor 291 may be used for an incoming call vibration prompt or for touch vibration feedback. The indicator 292 may be an indicator light, which may be used to indicate the charging status, the change in power, or may be used to indicate messages, missed calls, notifications, etc. The SIM card interface 295 is used to connect a SIM card. The SIM card may be inserted into or removed from the SIM card interface 295 to achieve contact and separation with the electronic device 101. The electronic device 101 may support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 295 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. In some embodiments, the electronic device 101 uses an embedded SIM (eSIM) card. The eSIM card can be embedded in the electronic device 101 and cannot be separated from the electronic device 101.

[0080] The electronic device 101 can realize the shooting function through the ISP, the camera 293, the video codec, the GPU, the display screen 294, and the application processor. The ISP is used to process the data fed back by the camera 293. In some embodiments, the ISP can be set in the camera 293. The camera 293 is used to capture a static image or a video. In some embodiments, the electronic device 101 may include 1 or N cameras 293, where N is a positive integer greater than 1.

[0081] The electronic device 101 can realize the display function through a GPU, a display screen 294, and an application processor. The GPU is a microprocessor for image processing, which connects the display screen 294 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 210 may include one or more GPUs, which execute computer instructions to generate or change display information.

[0082] The sensor module 280 may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, an angle sensor, etc. When the display screen 294 is a folding screen, the angle sensor may detect the folding angle of the display screen 294, and the folding angle ranges from 0 to 180 degrees.

[0083] The battery 241 may include one or more batteries to power the load.

[0084] The power management module 240 is used to receive charging input from a charger. The charger may be a wireless charger, such as a wireless charging base, other electronic devices 101 with reverse wireless charging function, etc. The power management module 240 may receive wireless charging input through a wireless charging coil 242 of the electronic device. The charger may also be a wired charger, for example, the power management module 240 may receive charging input from a wired charger through the USB interface 230. The power management module 240 is also called a charging chip.

[0085] The power management module 240 can charge the battery 241 and also power the electronic device. The power management module 240 receives input from the battery 241 and powers the processor 210, the internal memory 221, the external memory interface 220, the display screen 294, the camera 293, and the wireless communication module 260. The power management module 240 can also be used to monitor the capacity, voltage, battery cycle number, battery health status (leakage, impedance) and other parameters of the battery 241. In some other embodiments, the power management module 240 can also be set in the processor 210.

[0086] The display screen 294 is used to display images, videos, etc. The display screen 294 includes a display panel. In some embodiments, the electronic device 101 may include one or more display screens 294 .

[0087] The wireless communication function of the electronic device 101 can be implemented through the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modem processor, etc.

[0088] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 101 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of antennas. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0089] The mobile communication module 250 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc., applied to the electronic device 101. The wireless communication module 260 can provide solutions for wireless communications including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR), etc., applied to the electronic device 101. In some embodiments, the antenna 1 of the electronic device 101 is coupled to the mobile communication module 250, and the antenna 2 is coupled to the wireless communication module 260, so that the electronic device 101 can communicate with the network and other devices through wireless communication technology.

[0090] like Figure 3 As shown, the mobile communication module 250 may include a baseband chip 31 , a radio frequency integrated circuit (RFIC) 32 and a radio frequency front-end module (FEM) 33 .

[0091] The baseband chip 31 is used to convert the data from the processor 210 into a baseband signal, including modulation and demodulation, digital filtering, equalization processing, etc. of the baseband signal. The RFIC 32 is used to convert the baseband signal from the baseband chip 31 into a radio frequency signal, and transmit it through the radio frequency front-end module 33 and at least one of the multiple antennas 34, or, after receiving the radio frequency signal through at least one antenna and the radio frequency front-end module 33, convert it into a baseband signal and send it to the baseband chip 31, and the baseband chip 31 converts the baseband signal into data and sends it to the processor 210. It should be noted that the baseband chip 31 and the RFIC 32 can also be integrated with the processor 210 in the SoC. In the embodiment of the present application, the process of transmitting the radio frequency signal from the RFIC 32 to at least one of the multiple antennas through the radio frequency front-end module 33 is called feeding.

[0092] like Figure 4 As shown, the RF front end 33 includes a phase shift circuit 330 and an amplifier 331. The phase shift circuit 330 includes a power divider combiner 332 and a phase shifter 333. The amplifier 331 can be a power amplifier (PA) or a linear amplifier (LNA). When the amplifier 331 is a PA, the amplifier 331 amplifies the RF signal from the RFIC and sends it to the power divider combiner 332. The power divider combiner 332 divides the input RF signal into two RF signals with the same phase, one of which is transmitted through the antenna 341, and the other is transmitted through the antenna 342 after phase shifting by the phase shifter 333. When the amplifier 331 is an LNA, the antenna 341 and the antenna 342 receive one RF signal respectively, one RF signal is input into the power divider combiner 332, and the other is input into the power divider combiner 332 after phase shifting by the phase shifter 333. The power divider combiner 332 combines the two RF signals and sends them to the amplifier 331. It should be noted that the embodiment of the present application takes two antennas (antenna 341 and antenna 342) as an example, but is not intended to be limited to this. The RF front-end module 33 can also be connected to more antennas.

[0093] In the present application, the antenna efficiency when the amplifier 331 is a PA refers to the ratio of the power radiated by the antenna (i.e., the power of the electromagnetic wave part that is effectively converted) to the power output by the PA to the antenna. The radio frequency signal emitted by a single antenna may induce an electric field in other parts of the electronic device or the human body and be absorbed, so that the final radiated power is reduced. The phase shift circuit adjusts the phase difference between the radio frequency signals emitted by the two antennas by adjusting the phase shift angle of the phase shifter, so that the induced electric fields of the two radio frequency signals offset each other to reduce the absorbed power, so that the power of the combined radio frequency signal is increased relative to the radio frequency signal emitted by a single antenna, thereby improving the antenna efficiency when the PA output power remains unchanged.

[0094] In the present application, the antenna efficiency when the amplifier 331 is an LNA refers to the ratio of the power input from the antenna to the power received by the antenna. The fading of the RF signal under different wireless transmission paths may be different, and the power of the RF signal received by a single antenna varies greatly. However, when receiving the RF signal through two antennas, the fading difference can be reduced to a certain extent due to the different wireless transmission paths, thereby improving the average received power. And because the two antennas are in different positions, there may be a phase difference in the RF signals received by the two antennas. The phase shifting circuit adjusts the phase difference between the RF signals received by the two antennas by adjusting the phase shifting angle of the phase shifter, so that the phase difference is as small as possible before merging. Finally, the power of the merged RF signal is increased relative to the RF signal received by a single antenna, thereby improving the antenna efficiency. Unless otherwise specified, the present application is described by taking the amplifier 331 as a PA as an example.

[0095] For example, Figure 5 As shown, the electronic device 101 is in free space (not held by hand, Figure 5 Middle A), right hand holding ( Figure 5 Middle B), left hand hold ( Figure 5 C) In several scenarios, the antenna efficiency corresponding to different frequencies is simulated and obtained respectively Figure 6 There are several simulation results shown in A (free space), B (right hand holding), and C (left hand holding). And the antenna efficiency of the following sub-scenarios is simulated specifically: the antenna efficiency of a single antenna 341 without phase shifting; the antenna efficiency of a single antenna 342 without phase shifting; the antenna efficiency of dual antennas with different phase shift angles, for example, the antenna efficiency of dual antennas with a 90-degree phase shift and the antenna efficiency of dual antennas with a 25-degree phase shift. Taking the frequency ω of the RF signal output by the PA to the phase shift circuit as 700MHz-750MHz as an example, the above-mentioned phase shift circuit can improve the antenna efficiency by up to 1.4dB, 1dB, and 1.7dB relative to a single antenna 341 or a single antenna 342 by phase shifting the signal of one antenna. This requires that the loss of the phase shift circuit should not be too high, otherwise it will reduce the efficiency of the dual antenna. Therefore, the structure of the phase shift circuit is required to be as simple as possible to reduce the loss of the phase shift circuit. The following is combined with Figure 7-Figure 12 The structures and effects of several phase-shifting circuits are explained.

[0096] like Figure 7As shown, the embodiment of the present application provides a phase shift circuit 701, including port 1, port 2, port 3, inductor L, and capacitor C. Port 1 is connected to the first end of the inductor L and the first end of the capacitor C, the second end of the inductor L is connected to port 2, and the second end of the capacitor C is connected to port 3. The characteristic impedance at port 1 is R1, the characteristic impedance at port 2 is R2, and the characteristic impedance at port 3 is R3. Port 1 is used to connect the amplifier described above, port 2 is used to connect the antenna 341 described above, and port 3 is used to connect the antenna 342 described above.

[0097] The capacitance value of capacitor C satisfies The inductance value of the inductor L satisfies Among them, Z 0 represents the characteristic impedance, for example, Z 0 The resistance value of is 50Ω. ω represents the frequency of the transmitted radio frequency signal, and ω is 600-900 MHz by way of example.

[0098] When port 1 is an input port and port 2 and port 3 are output ports, such as Figure 8 As shown in A, the reflection coefficient of port 1 is at the (0,0) coordinate point of the Smith chart, which meets the impedance matching requirements. Figure 8 As shown in B, when ω is 750MHz, the phase difference (S(2,1)) of the signal output from port 2 relative to the signal input from port 1 is -45.509 degrees, and the phase difference (S(3,1)) of the signal output from port 3 relative to the signal input from port 1 is 44.624 degrees. It can be seen that the difference between the phase difference (S(3,1)) and the phase difference (S(2,1)) is about 90 degrees, that is, the phase difference between the signal output from port 3 and the signal output from port 2 is about 90 degrees. Figure 8 As shown in C, when ω is 700MHz, the efficiency of the signal output from port 2 relative to the signal input to port 1 is -2.783dB (S(2,1)), and the efficiency of the signal output from port 3 relative to the signal input to port 1 is -3.25dB (S(3,1)). Figure 8 As shown in C, when ω is 740MHz, the efficiency dB(S(2,1)) of the signal output from port 2 relative to the signal input to port 1 is -3.019dB, and the efficiency dB(S(3,1)) of the signal output from port 3 relative to the signal input to port 1 is -3.002dB. It can be seen that the efficiency dB(S(2,1)) and the efficiency dB(S(3,1)) can be basically the same.

[0099] On the contrary, when port 1 is the output port and port 2 and port 3 are the input ports, the signal output from port 1 is equivalent to the signal input from port 3 which is phase shifted by about 90 degrees and then combined with the signal input from port 2.

[0100] like Fig. 9 As shown, the embodiment of the present application provides another phase shift circuit 901, including port 1, port 2, port 3, inductor L1, inductor L2, and capacitor C. Port 1 is connected to the first end of inductor L1, the first end of inductor L2, and the first end of capacitor C, the second end of capacitor C is grounded, the second end of inductor L1 is connected to port 2, and the second end of inductor L2 is connected to port 3. The characteristic impedance at port 1 is R1, the characteristic impedance at port 2 is R2, and the characteristic impedance at port 3 is R3. Port 1 is connected to the amplifier described above, port 2 is used to connect to the antenna 341 described above, and port 3 is used to connect to the antenna 342 described above.

[0101] The capacitance value of capacitor C satisfies The inductance values ​​of inductors L1 and L2 satisfy Among them, Z 0 represents the characteristic impedance, for example, Z 0 The resistance value of is 50Ω. ω represents the frequency of the radio frequency signal input by the first fixed terminal A1, and ω is 600-900 MHz by way of example.

[0102] When port 1 is an input port and port 2 and port 3 are output ports, such as Fig.10 As shown in Figure A, the reflection coefficient of port 1 is near the (0,0) coordinate point of the Smith chart, which basically meets the impedance matching requirements. Fig.10 As shown in B, when ω is 750MHz, the phase difference (S(2,1)) of the signal output from port 2 relative to the signal input from port 1 is -45.893 degrees, and the phase difference (S(3,1)) of the signal output from port 3 relative to the signal input from port 1 is -45.893 degrees. It can be seen that the phase difference (S(3,1)) is the same as the phase difference (S(2,1)), that is, the signal output from port 2 is in phase with the signal output from port 3. Fig.10 As shown in C, when ω is 700MHz, the efficiency of the signal output from port 2 relative to the signal input to port 1 is -3.016dB (S(2,1)), and the efficiency of the signal output from port 3 relative to the signal input to port 1 is -3.016dB (S(3,1)). Fig.10 As shown in C, when ω is 740MHz, the efficiency dB(S(2,1)) of the signal output from port 2 relative to the signal input to port 1 is -3.01dB, and the efficiency dB(S(3,1)) of the signal output from port 3 relative to the signal input to port 1 is -3.01dB. It can be seen that the efficiency dB(S(2,1)) and the efficiency dB(S(3,1)) can be made the same.

[0103] On the contrary, when port 1 is an output port and port 2 and port 3 are input ports, the signal output from port 1 is equivalent to the signal input from port 3 combined with the signal input from port 2.

[0104] It should be noted that when at least one of the frequency of the radio frequency signal, the capacitance of the capacitor, or the inductance of the inductor is changed, the phase shift angle of the phase shift circuit will also change.

[0105] like Fig.11 As shown, an embodiment of the present application provides a phase shift circuit 1101, including port 1, port 2, port 3, inductor L1, inductor L2, capacitor C1, and capacitor C2. Port 1 is connected to the first end of the inductor L1 and the first end of the capacitor C1, port 1 is disconnected from the inductor L2, the second end of the inductor L1 is connected to port 2 and the first end of the capacitor C2, the second end of the capacitor L2 is connected to port 3, and the second end of the capacitor C1 and the second end of the capacitor C2 are both grounded. The characteristic impedance at port 1 is R1, the characteristic impedance at port 2 is R2, and the characteristic impedance at port 3 is R3. Port 1 is connected to the amplifier described above, port 2 is used to connect to the antenna 341 described above, and port 3 is used to connect to the antenna 342 described above.

[0106] The capacitance value of capacitor C satisfies The inductance value of the inductor L satisfies Among them, Z 0 represents the characteristic impedance, for example, Z 0 The resistance value of is 50Ω. ω represents the frequency of the radio frequency signal input by the first fixed terminal A1, and ω is 600-900 MHz by way of example.

[0107] When port 1 is an input port and port 2 is an output port, such as Fig.12 As shown in Figure A, the reflection coefficient of port 1 is near the (0,0) coordinate point of the Smith chart, which basically meets the impedance matching requirements. Fig.12 As shown in B, when ω is 750MHz, the phase difference (S(2,1)) of the signal output from port 2 relative to the signal input to port 1 is -91.792 degrees, that is, the phase difference of the signal output from port 3 relative to the signal input to port 1 is about -90 degrees. Since port 3 is disconnected from port 1, the phase difference (S(3,1)) of the signal output from port 3 relative to the signal input to port 1 does not need to be considered. Fig.12As shown in Figure C, when ω is 700MHz, the efficiency dB(S(2,1)) of the signal output from port 2 relative to the signal input to port 1 is -0.009dB. When ω is 740MHz, the efficiency dB(S(2,1)) of the signal output from port 2 relative to the signal input to port 1 is 0dB. Since port 3 is disconnected from port 1, there is no need to consider the efficiency dB(S(3,1)) of the signal output from port 3 relative to the signal input to port 1. It can be seen that by expanding the phase shift circuit and disconnecting one output terminal, impedance matching of a single transmission line can be achieved, which has good flexibility.

[0108] On the contrary, when port 1 is the output port and port 2 is the input port, the signal output from port 1 is equivalent to a phase shift of about -90 degrees on the signal input to port 2.

[0109] based on Figure 7-Figure 12 Analysis, such as Fig.13 As shown, the embodiment of the present application provides a radio frequency front end 33, including a phase shift circuit 1301 and an amplifier 1302. The phase shift circuit 1301 includes: a multi-open switch K, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C4, a filter F1 and a filter F2. The amplifier 1302 can be a PA or a linear amplifier (linear amplifier, LNA). The present application takes PA as an example, but is not limited to this.

[0110] The multi-open switch K includes multiple fixed ends (represented by A) and multiple active ends (represented by B). The multiple fixed ends include a first fixed end A1 and a second fixed end A2. The multiple active ends include a first active end B1, a second active end B2, a third active end B3, a fourth active end B4 and a fifth active end B5. The first fixed end A1 can be connected to at least two of the multiple active ends, and the first fixed end A1 is connected to the amplifier 1302. When the amplifier 1302 is a PA, the first fixed end A1 is connected to the output end of the amplifier 1302 for receiving the radio frequency signal from the amplifier 1302; when the amplifier 1302 is an LNA, the first fixed end A1 is connected to the input end of the amplifier 1302 for sending the radio frequency signal to the amplifier 1302. The second fixed end A2 is grounded and can be connected to any of the multiple active ends. The conduction of the multi-open switch K can be determined by Figure 3 The processor 210 is controlled in FIG.

[0111] The first active terminal B1 is connected to the first end of the first inductor L1, the second active terminal B2 is connected to the first end of the first capacitor C1, the third active terminal B3 is connected to the first end of the third capacitor C3, the fourth active terminal B4 is connected to the first end of the second capacitor C2, and the fifth active terminal B5 is connected to the first end of the second inductor L2. The second end of the first inductor L1 is connected to the second end of the first capacitor C1 at a first connection point, and the first connection point is connected to the antenna 341 through the filter F1. The second end of the second inductor L2 is connected to the second end of the second capacitor C2 at a second connection point, and the second connection point is connected to the antenna 342 through the filter F2. The second end of the third capacitor C3 is grounded. The filter F1 and the filter F2 are used to filter the radio frequency signal.

[0112] The satisfying of the preset conditions involved in this application means that the capacitance values ​​of the above-mentioned capacitors (capacitor C1, capacitor C2, capacitor C3) satisfy The inductance values ​​of each inductor (inductor L1, inductor L2) satisfy Among them, Z 0 represents the characteristic impedance, and ω represents the frequency of the transmitted RF signal. For example, Z 0 The resistance is 50Ω, ω is 600-900MHz, C=4.3pF, L=10.8nH.

[0113] Combine the following Figure 14-18 Several possible conduction modes of the multi-open switch K are described.

[0114] In a possible implementation, Fig.14 As shown, in the first state, the first fixed terminal A1 is connected to the first active terminal B1 and the fourth active terminal B4. At this time, the phase shift circuit 1301 is equivalent to Figure 7 The phase shift circuit 701 shown in FIG. Fig.14 The inductor L1 in the Figure 7 The inductance L in Fig.14 The capacitor C2 in the Figure 7 The capacitance C in Fig.14 The first fixed end A1 in is equivalent to Figure 7 Port 1 in Fig.14 The antenna 341 in the Figure 7 Port 2 in Fig.14 The antenna 342 in the Figure 7 Port 3 in .

[0115] For example, the amplifier 1302 is used as a PA to transmit a radio frequency signal. Fig.14The phase difference of the RF signal at antenna 342 relative to the RF signal at antenna 341 is within a preset angle range (e.g., 60 to 120 degrees). Exemplarily, when the preset conditions are met, the phase difference is approximately 90 degrees. Fig. 22 In the antenna pattern shown in A, the RF signal emitted by antenna 342 and the RF signal emitted by antenna 341 are combined. The phase difference of the RF signal is within a preset angle range (e.g., 15 to 75 degrees) relative to the RF signal emitted by antenna 341. The power of the combined RF signal in this direction is improved, which not only improves the antenna efficiency, but can also be applied to beamforming. Beamforming in this application refers to adjusting the phases of RF signals emitted by multiple antennas so that these RF signals are combined to produce a directional beam.

[0116] Taking the amplifier 1302 as an LNA to receive a radio frequency signal as an example, the radio frequency signal input by the amplifier 1302 is equivalent to the radio frequency signal received by the antenna 342 being phase shifted within a preset angle range (e.g., 60 degrees to 120 degrees), and then combined with the radio frequency signal received by the antenna 341, so that the power of the received radio frequency signal is improved, thereby improving the antenna efficiency. Exemplarily, when the preset conditions are met, the above phase shift is about 90 degrees.

[0117] In another possible implementation, Fig.15 As shown, in the second state, the first fixed terminal A1 is connected to the second active terminal B2 and the fifth active terminal B5. At this time, the phase shift circuit 1301 is equivalent to Figure 7 The phase shift circuit 701 shown in FIG. Fig.15 The inductor L2 in the Figure 7 The inductance L in Fig.15 The capacitor C1 in the Figure 7 The capacitance C in Fig.15 The first fixed end A1 in is equivalent to Figure 7 Port 1 in Fig.14 The antenna 342 in the Figure 7 Port 2 in Fig.14 The antenna 341 in the Figure 7 Port 3 in .

[0118] For example, the amplifier 1302 is used as a PA to transmit a radio frequency signal. Fig.15 The phase difference of the RF signal at antenna 342 relative to the RF signal at antenna 341 is within a preset angle range (e.g., -60 degrees to -120 degrees). Exemplarily, when the preset conditions are met, the phase difference is approximately -90 degrees. Fig. 22In the antenna radiation pattern shown in B, the RF signal obtained by combining the RF signal transmitted by antenna 342 and the RF signal transmitted by antenna 341 has a phase difference within a preset angle range (for example, -15 degrees to -75 degrees) relative to the RF signal transmitted by antenna 341. The power of the combined RF signal is increased in this direction, which not only improves the antenna efficiency but can also be applied to beamforming.

[0119] Taking the amplifier 1302 as an LNA to receive a radio frequency signal as an example, the radio frequency signal input by the amplifier 1302 is equivalent to the radio frequency signal received by the antenna 342 being phase shifted within a preset angle range (e.g., -60 degrees to -120 degrees), and then combined with the radio frequency signal received by the antenna 341, so that the power of the received radio frequency signal is improved, thereby improving the antenna efficiency. Exemplarily, when the preset conditions are met, the above phase shift is approximately -90 degrees.

[0120] In another possible implementation, Fig.16 As shown, in the third state, the first fixed terminal A1 is connected to the first active terminal B1, the third active terminal B3 and the fifth active terminal B5. At this time, the phase shift circuit 1301 is equivalent to Fig. 9 The phase shift circuit 901 shown in FIG. Fig.16 The inductor L1 in the Fig. 9 The inductor L1 in Fig.16 The inductor L2 in the Fig. 9 The inductor L2 in Fig.16 The capacitor C3 in the Fig. 9 The capacitance C in Fig.16 The first fixed end A1 in is equivalent to Fig. 9 Port 1 in Fig.16 The antenna 341 in the Fig. 9 Port 2 in Fig.16 The antenna 342 in the Fig. 9 Port 3 in .

[0121] For example, the amplifier 1302 is used as a PA to transmit a radio frequency signal. Fig.16 The RF signal at antenna 342 in FIG. 1 is in phase with the RF signal at antenna 341. Fig. 22 In the antenna radiation pattern shown in C, the RF signal obtained by combining the RF signal transmitted by antenna 342 and the RF signal transmitted by antenna 341 is the same in phase with the RF signal transmitted by antenna 341, and the power of the combined RF signal in this direction is further improved, which not only improves the antenna efficiency but can also be applied to beamforming.

[0122] Taking the amplifier 1302 as an LNA to receive a radio frequency signal as an example, the radio frequency signal input by the amplifier 1302 is equivalent to combining the radio frequency signal received by the antenna 342 and the radio frequency signal received by the antenna 341, so that the power of the received radio frequency signal is improved, thereby improving the antenna efficiency.

[0123] In another possible implementation, Fig.17 As shown, in the fourth state, the second fixed terminal A2 is connected to the second active terminal B2, and the first fixed terminal A1 is connected to the first active terminal B1 and the third active terminal B3. At this time, the phase shift circuit 1301 is equivalent to Fig.11 The phase shift circuit 1101 shown in FIG. Fig.17 The inductor L1 in the Fig.11 The inductor L1 in Fig.17 The capacitor C1 in the Fig.11 The capacitor C2 in Fig.17 The capacitor C3 in the Fig.11 The capacitor C1 in Fig.17 The first fixed end A1 in is equivalent to Fig.11 Port 1 in Fig.17 The antenna 341 in the Fig.11 Port 2 in the embodiment of the present invention realizes that a single antenna 341 transmits and receives radio frequency signals. For example, the amplifier 1302 is used as a PA to transmit radio frequency signals. Fig. 22 In the antenna radiation pattern shown in D, antenna 341 is an omnidirectional antenna, which can be used to disconnect antenna 342 when antenna 342 is interfered.

[0124] In another possible implementation, Fig.18 As shown, in the fifth state, the second fixed terminal A2 is connected to the fourth active terminal B4, and the first fixed terminal A1 is connected to the third active terminal B3 and the fifth active terminal B5. At this time, the phase shift circuit 1301 is equivalent to Fig.11 The phase shift circuit 1101 shown in FIG. Fig.18 The inductor L2 in the Fig.11 The inductor L1 in Fig.18 The capacitor C2 in the Fig.11 The capacitor C2 in Fig.18 The capacitor C3 in the Fig.11 The capacitor C1 in Fig.18 The first fixed end A1 in is equivalent to Fig.11 Port 1 in Fig.18 The antenna 342 in the Fig.11 Port 2 in the embodiment of the present invention realizes that a single antenna 342 transmits and receives radio frequency signals. For example, the amplifier 1302 is used as a PA to transmit radio frequency signals. Fig. 22In the antenna radiation pattern shown in E, antenna 342 is an omnidirectional antenna, which can be used to disconnect antenna 341 when antenna 341 is interfered.

[0125] In addition, based on the previous Fig.11 and Fig.12 According to the analysis, an inductor (inductor L1) is connected in series between the first ends of two capacitors (capacitor C1 and capacitor C2), the second ends of the two capacitors are grounded, the first end of one capacitor is used as the input end (port 1), and the first end of the other capacitor is used as the output end (port 2). It can be achieved that the phase difference of the output end relative to the input end is within a preset angle range (for example, -60 degrees to -120 degrees). It is assumed that such a circuit is called a preset angle range phase shift circuit. Such a preset angle range phase shift circuit can be connected in series with an active end of the multi-open switch K, so that the signal output by the active end is further superimposed with a preset angle range (for example, -60 degrees to -120 degrees) phase shift. Exemplarily, when the preset conditions are met, the above phase shift is approximately -90 degrees phase shift.

[0126] Optional, such as Fig.19 As shown, in Fig.13 Based on the phase shift circuit 1301 shown, the phase shift circuit 1301 also includes: an inductor L3 and a capacitor C4. The multiple fixed ends of the multi-open switch K also include a third fixed end A3, and the multiple active ends of the multi-open switch K also include a sixth active end B6. The third fixed end A3 can be connected to any active end of the multiple active ends. The sixth active end B6 is connected to the first end of the third inductor L3, the second end of the third inductor L3 is connected to the third fixed end A3 and the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is grounded.

[0127] The preset conditions also include: the capacitance value of capacitor C4 also satisfies The inductance value of inductor L3 also satisfies Among them, Z 0 represents the characteristic impedance, and ω represents the frequency of the transmitted RF signal. For example, Z 0 is 50Ω, ω is 600-900MHz, C=4.3pF, L=10.8nH.

[0128] In a possible implementation, Fig. 20 As shown, in the sixth state, the first fixed terminal A1 is connected to the sixth movable terminal B6 and the fourth movable terminal B4, the second fixed terminal A2 is connected to the second movable terminal B2, and the third fixed terminal A3 is connected to the first movable terminal B1. Fig.14 The antenna 341 of the circuit shown is further superimposed with a phase shift within a preset angle range (eg, -60 degrees to -120 degrees). Exemplarily, when the preset conditions are met, the above phase shift is approximately -90 degrees.

[0129] Taking the amplifier 1302 as a PA to transmit a radio frequency signal as an example, since Fig.14 The antenna 342 of the circuit shown has a phase difference with respect to the antenna 341 within a preset angle range (e.g., 60 to 120 degrees). For example, when the preset conditions are met, the phase difference is about 90 degrees. So in fact, Fig. 20 The phase difference of the RF signal at antenna 342 relative to the RF signal at antenna 341 is within a preset angle range (e.g., 150 degrees to 210 degrees). Exemplarily, when the preset conditions are met, the phase difference is approximately 180 degrees. Fig. 22 In the antenna radiation pattern shown in F, the RF signal obtained by combining the RF signal transmitted by antenna 342 and the RF signal transmitted by antenna 341 has a phase difference within a preset angle range (for example, 150 degrees to 210 degrees) relative to the RF signal transmitted by antenna 341, which not only improves the antenna efficiency but can also be applied to beamforming.

[0130] Taking amplifier 1302 as an LNA to receive RF signals as an example, the RF signal input by amplifier 1302 is equivalent to phase shifting the RF signal received by antenna 342 within a preset angle range (for example, 150 degrees to 210), and then merging it with the RF signal received by antenna 341. The power of the received RF signal is improved, thereby improving the antenna efficiency.

[0131] In another possible implementation, Fig.21 As shown, in the seventh state, the first fixed terminal A1 is connected to the sixth movable terminal B6 and the second movable terminal B2, the second fixed terminal A2 is connected to the fourth movable terminal B4, and the third fixed terminal A3 is connected to the fifth movable terminal B5. Fig.15 The antenna 342 of the circuit shown is further superimposed with a phase shift within a preset angle range (eg, -60 degrees to -120 degrees). Exemplarily, when the preset conditions are met, the above phase shift is approximately -90 degrees.

[0132] Taking the amplifier 1302 as a PA to transmit a radio frequency signal as an example, since Fig.15 The phase difference between antenna 341 and antenna 342 of the circuit shown is within a preset angle range (e.g., 60 to 120 degrees). For example, when the preset conditions are met, the phase difference is about 90 degrees. So in fact, Fig.21 The phase difference of the RF signal at antenna 341 relative to the RF signal at antenna 342 is within a preset angle range (e.g., 150 degrees to 210 degrees). Exemplarily, when the preset conditions are met, the phase difference is approximately 180 degrees. Fig. 22In the antenna radiation pattern shown in F, the RF signal obtained by combining the RF signal transmitted by antenna 342 and the RF signal transmitted by antenna 341 has a phase difference within a preset angle range (for example, 150 degrees to 210 degrees) relative to the RF signal transmitted by antenna 341, which not only improves the antenna efficiency but can also be applied to beamforming.

[0133] Taking amplifier 1302 as an LNA to receive RF signals as an example, the RF signal input by amplifier 1302 is equivalent to phase shifting the RF signal received by antenna 341 within a preset angle range (150 degrees to 210 degrees), and then merging it with the RF signal received by antenna 342. The power of the received RF signal is improved, thereby improving the antenna efficiency.

[0134] In the phase shift circuit provided by the embodiment of the present application, the first fixed end of the multi-open switch can be connected to at least two of the multiple active ends, some of the active ends are connected to the antenna through capacitors or inductors, and some of the active ends are grounded through capacitors. The inductors and capacitors can realize phase shifting of the RF signal, and with the different conduction states of the multi-open switch, the phase shift can be adjustable and basically meet the impedance matching requirements. In addition, the loss of the switch, capacitor, and inductor itself is very small, and accordingly, the loss of the phase shift circuit formed is also very small, which helps to improve the antenna efficiency.

[0135] The application scenario of the above phase shifting circuit is described below.

[0136] Based on the above phase shift circuit, the embodiment of the present application provides an antenna feeding control method, which can be Figure 3 The processor 210 in is executed. The method is used to control the multi-open switch in the above-mentioned phase-shifting circuit, so that switching between multiple antenna feeding or single antenna feeding can be achieved. When the antenna impedance is within the expected impedance range, the attenuation of the RF signal emitted by the antenna is very small, and the communication quality is good. When multiple antennas are fed, if it is detected that a human body blocks one of the multiple antennas, it will cause the impedance of the antenna to be mismatched (that is, it is not within the expected impedance range), thereby reducing the overall performance of the multiple antennas, and the RF signal is attenuated too much, reducing the communication quality. At this time, it is possible to switch from multiple antenna feeding to single antenna feeding to disconnect the antenna blocked by the human body and improve the antenna performance. Conversely, when a single antenna is fed, if it is detected that the human body does not block multiple antennas, it is possible to switch from single antenna feeding to multiple antenna feeding, thereby improving antenna efficiency. Fig.23 As shown, the method includes:

[0137] S101. An electronic device detects a distance between a target antenna among multiple antennas and a human body.

[0138] The target antenna refers to any antenna among the multiple antennas. The distance between the target antenna and the human body can be used to determine whether the target antenna is blocked by the human body. For example, if the distance between the target antenna and the human body is less than or equal to a threshold, it can be considered that the target antenna is blocked by the human body. Otherwise, if the distance between the target antenna and the human body is greater than a threshold, it can be considered that the target antenna is not blocked by the human body. Specifically, the distance between the target antenna and the human body can be detected in the following ways.

[0139] In a possible implementation, a specific abosorption rate (SAR) sensor is set on the electronic device within a preset distance of the target antenna. The electronic device can detect the distance between the target antenna and the human body by detecting the SAR through the specific abosorption rate (SAR) sensor, and then determine whether the target antenna is blocked by the human body. The smaller the preset distance, the more accurate the detection. A SAR sensor can be set for each antenna, or only for antennas that are easily affected by the human body.

[0140] SAR is used to evaluate the radiation level generated by electronic devices to the human body. The larger the SAR, the more energy of the radio frequency signal is absorbed by the human body, and the closer the distance between the target antenna and the human body. Therefore, when the SAR detected by the SAR sensor is greater than or equal to the SAR threshold, it can be determined that the distance between the target antenna and the human body is less than or equal to the threshold, and then it is determined that the target antenna within the preset distance of the SAR sensor is blocked by the human body. When the SAR detected by the SAR sensor is less than the SAR threshold, it can be determined that the distance between the target antenna and the human body is greater than the threshold, and then it is determined that the target antenna within the preset distance of the SAR sensor is not blocked by the human body. Therefore, when the SAR detected by all SAR sensors is less than the SAR threshold, it can be determined that multiple antennas are not blocked by the human body.

[0141] In another possible implementation, the target area of ​​the touch screen of the electronic device is within the preset distance of the target antenna, and the electronic device can detect whether the human body is in contact with the target area through the touch screen to detect the distance between the target antenna and the human body, and then determine whether the target antenna is blocked by the human body. The smaller the preset distance, the more accurate the detection. A target area can be determined for each antenna, or only the target area can be set for antennas that are easily affected by the human body.

[0142] Specifically, if the electronic device detects that the human body is in contact with the target area through the touch screen, it can be determined that the distance between the target antenna and the human body is less than or equal to the threshold, and then the target antenna within the preset distance of the target area is blocked by the human body. When the electronic device detects that the human body is not in contact with the target area through the touch screen, it can be determined that the distance between the target antenna and the human body is greater than the threshold, and then the target antenna within the preset distance of the target area is not blocked by the human body. Therefore, when the electronic device detects that the human body is not in contact with all target areas through the touch screen, it can be determined that multiple antennas are not blocked by the human body.

[0143] In another possible implementation, an impedance detection chip is provided on the electronic device, and the impedance detection chip is connected to the target antenna. The electronic device can detect the impedance of the target antenna through the impedance detection chip to detect the distance between the target antenna and the human body, and then determine whether the target antenna is blocked by the human body.

[0144] Specifically, if the electronic device detects that the impedance of the target antenna is not within a preset range (e.g., an ideal impedance range) through an impedance detection chip, it can be determined that the distance between the target antenna and the human body is less than or equal to a threshold value, and then the target antenna is blocked by the human body. If the electronic device detects that the impedance of the target antenna is within a preset range through an impedance detection chip, it can be determined that the distance between the target antenna and the human body is greater than a threshold value, and then the target antenna is not blocked by the human body. Therefore, when the electronic device detects that the impedance of multiple antennas is within a preset range through an impedance detection chip, it can be determined that multiple antennas are not blocked by the human body.

[0145] S102: If the distance between the target antenna and the human body is less than or equal to the threshold, the multi-open switch in the phase shift circuit is controlled to disconnect the path of the target antenna.

[0146] Electronic devices can control multiple switches from Figure 14-16 , Figure 20-21 The on-state shown is switched to Figure 17-Figure 18 The conductive state shown is thus disconnected from the path of the antenna blocked by the human body.

[0147] For example, Figure 5 , Fig.14 and Fig.18 As shown, assuming that the multi-open switch K is in the initial state Fig.14 The conduction state, such as Figure 5 As shown in C, the user holds the electronic device 101 so that the human body blocks the antenna 341 (i.e., the target antenna). At this time, the electronic device detects that the antenna 341 is blocked by the human body according to the method of S101, and controls the multi-open switch K to switch to Fig.18 The conductive state shown is to disconnect the antenna 341 blocked by the human body, thereby improving the antenna performance.

[0148] S103: If the distance between the target antenna and the human body is greater than a threshold, control the multi-open switch to turn on the path of the target antenna.

[0149] Electronic devices can control multiple switches from Figure 17-Figure 18 The on-state shown is switched to Figure 14-16 , Figure 20-21 The conductive state shown is restored, thereby restoring the path of the antenna that is not blocked by the human body.

[0150] For example, Figure 5 , Fig.14 and Fig.18 As shown, assuming that the multi-open switch K is in the initial state Fig.18 The conduction state, such as Figure 5 As shown in A, the user does not hold the electronic device 101 so that the human body does not block the antenna 341 (i.e., the target antenna). At this time, the electronic device detects that the antenna 341 is not blocked by the human body according to S101, and controls the multi-open switch K to switch to Fig.14 The conductive state shown is to restore the path of the antenna 341 that is not blocked by the human body, thereby improving the antenna efficiency.

[0151] like Fig.24 As shown, the embodiment of the present application also provides a chip system. The chip system 240 includes at least one processor 2401 and at least one interface circuit 2402. The at least one processor 2401 and the at least one interface circuit 2402 can be interconnected through a line. The processor 2401 is used to support the electronic device to implement each step in the above method embodiment, such as Fig.23 In the method shown, at least one interface circuit 2402 may be used to receive signals from other devices (eg, memory) or to send signals to other devices (eg, communication interface). The chip system may include a chip and may also include other discrete devices.

[0152] The present application also provides a computer-readable storage medium, which includes instructions. When the instructions are executed on the electronic device, the electronic device executes each step in the method embodiment, such as executing Fig.23 The method shown.

[0153] The present application also provides a computer program product including instructions. When the instructions are executed on the electronic device, the electronic device executes each step in the method embodiment, such as executing Fig.23 The method shown.

[0154] Regarding the technical effects of the chip system, computer-readable storage medium, and computer program product, refer to the technical effects of the previous method embodiments.

[0155] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0156] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0157] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0158] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods 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. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0159] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one device or distributed on multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0160] In addition, each functional module in each embodiment of the present application may be integrated into one device, or each module may exist physically separately, or two or more modules may be integrated into one device.

[0161] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may contain one or more servers, data centers and other data storage devices that can be integrated with the medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0162] 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 who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A phase shift circuit, characterized in that: include: A multi-open switch, a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor; the multi-open switch includes a first fixed end and a plurality of movable ends, the plurality of movable ends include a first movable end, a second movable end, a third movable end, a fourth movable end, and a fifth movable end; the first fixed end can be connected to at least two of the plurality of movable ends; The first active end is connected to the first end of the first inductor, the second active end is connected to the first end of the first capacitor, the third active end is connected to the first end of the third capacitor, the fourth active end is connected to the first end of the second capacitor, and the fifth active end is connected to the first end of the second inductor; the second end of the first inductor and the second end of the first capacitor are connected to a first connection point, and the first connection point is used to connect to a first antenna; the second end of the second inductor and the second end of the second capacitor are connected to a second connection point, and the second connection point is used to connect to a second antenna; the second end of the third capacitor is grounded.

2. The circuit according to claim 1, characterized in that In a first state, the first fixed end is electrically connected to the first movable end and the fourth movable end.

3. The circuit according to claim 1 or 2, characterized in that: In the second state, the first fixed end is conductively connected to the second movable end and the fifth movable end.

4. The circuit according to claim 1 or 2, characterized in that: In the third state, the first fixed end is electrically connected to the first movable end, the third movable end, and the fifth movable end.

5. The circuit according to claim 1 or 2, characterized in that: The multi-open switch also includes a second fixed end, which is grounded. In a fourth state, the second fixed end is conductively connected to the second movable end, and the first fixed end is conductively connected to the first movable end and the third movable end.

6. The circuit according to claim 1 or 2, characterized in that: The multi-open switch also includes a second fixed end, which is grounded. In the fifth state, the second fixed end is connected to the fourth active end, and the first fixed end is connected to the third active end and the fifth active end.

7. The circuit according to claim 1 or 2, characterized in that: The multi-open switch also includes a third fixed end and a second fixed end connected to ground, the circuit also includes a third inductor and a fourth capacitor, and the multiple active ends also include a sixth active end; the sixth active end is connected to the first end of the third inductor, the second end of the third inductor is connected to the third fixed end and the first end of the fourth capacitor, and the second end of the fourth capacitor is grounded.

8. The circuit according to claim 7, characterized in that In the sixth state, the first fixed end is conductively connected to the sixth movable end and the fourth movable end, the second fixed end is conductively connected to the second movable end, and the third fixed end is conductively connected to the first movable end.

9. The circuit according to claim 7, characterized in that In the seventh state, the first fixed end is conductively connected to the sixth movable end and the second movable end, the second fixed end is conductively connected to the fourth movable end, and the third fixed end is conductively connected to the fifth movable end.

10. The circuit according to claim 1 or 2, characterized in that: The capacitance value of the capacitor satisfies The inductance value of the inductor satisfies Wherein, Z0 represents characteristic impedance, and ω represents the frequency of the transmitted RF signal.

11. An antenna feeding control method, characterized in that: Applied to the phase shift circuit according to any one of claims 1 to 10, the method comprising: Detecting the distance between a target antenna among multiple antennas and a human body; If the distance between the target antenna and the human body is less than or equal to a threshold, controlling the multi-open switch in the phase shift circuit to disconnect the path of the target antenna; If the distance between the target antenna and the human body is greater than the threshold, the multi-open switch is controlled to turn on the path of the target antenna.

12. The method according to claim 11, characterized in that A specific absorption rate (SAR) sensor is arranged within a preset distance of the target antenna, and the detecting of the distance between the target antenna among the multiple antennas and the human body includes: The SAR sensor detects the SAR to detect the distance between the target antenna and the human body.

13. The method according to claim 11, characterized in that The target area of ​​the touch screen is within a preset distance of the target antenna, and the detecting the distance between the target antenna among the multiple antennas and the human body includes: The touch screen detects whether the human body is in contact with the target area to detect the distance between the target antenna and the human body.

14. The method according to claim 11, characterized in that The target antenna is connected to an impedance detection chip, and the detecting the distance between the target antenna among the multiple antennas and the human body comprises: The impedance of the target antenna is detected by the impedance detection chip to detect the distance between the target antenna and the human body.

15. A radio frequency front-end module, characterized in that: It comprises an amplifier and a phase shift circuit as described in any one of claims 1 to 10, wherein the amplifier is connected to the phase shift circuit.

16. An electronic device, characterized in that: It comprises a processor, multiple antennas and a phase shift circuit as described in any one of claims 1 to 10, wherein the phase shift circuit is connected to the multiple antennas, and the processor is used to control the phase shift circuit to feed at least one of the multiple antennas.

17. A computer-readable storage medium, characterized in that: The method comprises instructions which, when executed on an electronic device, cause the electronic device to execute the method according to any one of claims 11 to 14.

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