RF matching network system, modulation method and terminal

Abstract

This application provides an RF matching network system, adjustment method, and terminal. The RF matching network system includes: an adjustable matching network unit, a controller, and a drive execution unit. The adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors. The controller is connected to the adjustable matching network unit and, upon detecting a preset event, determines the first matching parameter information corresponding to the current frequency band of the transmitted and received signals in a mapping table. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. The drive execution unit is connected to both the controller and the adjustable matching network unit. The controller controls the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information. This solution ensures the instantaneous stability and continuous high efficiency of the RF link in multi-band rapid switching and dynamic environments.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a radio frequency matching network system, modulation method and terminal. Background Technology

[0002] In the radio frequency (RF) transmission link of a wireless communication terminal, the antenna is typically connected to the power amplifier via a fixed matching network to ensure efficient RF energy radiation. However, when the terminal is in different operating environments, the antenna's input impedance may change drastically, causing severe power reflection. Unradiated energy bounces back to the power amplifier, reducing transmission efficiency.

[0003] In existing technologies, to mitigate the impact of environmental factors, a compromise is usually made in antenna design to ensure that it has certain performance in both idle and disturbed environments.

[0004] However, this approach often sacrifices ideal transmission efficiency, resulting in a waste of terminal radio frequency resources. Summary of the Invention

[0005] This application provides an RF matching network system, adjustment method, and terminal to achieve flexible adjustment of the RF matching network in order to improve transmission efficiency.

[0006] In a first aspect, embodiments of this application provide a radio frequency matching network system, including: an adjustable matching network unit, a controller, and a drive execution unit, wherein the adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors;

[0007] The controller is connected to the adjustable matching network unit and is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signal in the mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors.

[0008] The drive execution unit is connected to the controller and the adjustable matching network unit respectively. The controller is further configured to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information.

[0009] In one or more embodiments, the adjustable matching network unit includes: a first capacitor module, an inductor module, and a second capacitor module connected to the first capacitor module via the inductor module;

[0010] The first capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units;

[0011] The second capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units;

[0012] The inductor module includes: multiple series inductors arranged in binary and each connected in parallel with a switching unit.

[0013] In one or more embodiments, the number of capacitors in both the first capacitor module and the second capacitor module is 8;

[0014] The inductor module contains eight inductors.

[0015] In one or more embodiments, the controller is configured to generate SPI control commands based on the first matching parameter information and send them to the drive execution unit;

[0016] The drive execution unit converts the SPI control commands into 24-bit GPO 0 / 1 digital signals to control the on / off state of each switch unit in the adjustable matching network unit.

[0017] In one or more embodiments, the system further includes: a dual directional coupler and a signal conversion unit connected to the dual directional coupler;

[0018] The dual directional coupler is connected to the adjustable matching network unit and the antenna respectively, and is used to detect the incident power signal output by the adjustable matching network unit and the reflected power signal fed back by the antenna;

[0019] The signal conversion unit is used to convert the incident power signal and the reflected power signal into first digital signals respectively;

[0020] The controller is connected to the signal conversion unit and is used to update the first matching parameter information according to the first digital signal.

[0021] In one or more embodiments, the signal conversion unit includes: a single-pole double-throw switch, a detector, and an analog-to-digital converter connected in sequence;

[0022] The single-pole double-throw switch is used to select the incident power signal or the reflected power signal for detection.

[0023] The detector is used to convert the incident power signal or the reflected power signal into a first analog signal;

[0024] The analog-to-digital converter is used to convert the first analog signal into the first digital signal.

[0025] Secondly, embodiments of this application provide a method for regulating a radio frequency matching network system, applied to the controller described in any of the above claims, the method comprising:

[0026] After a preset event is detected, the first matching parameter information corresponding to the current frequency band of the transmitted and received signal is determined in the mapping table. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors.

[0027] Based on the first matching parameter information, the control drive execution unit adjusts the adjustable matching network unit.

[0028] In one or more embodiments, the preset event includes at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflection power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

[0029] In one or more embodiments, the method further includes:

[0030] Obtain the reflected power or VSWR of the radio frequency matching network system;

[0031] If the reflected power or the standing wave ratio is greater than a third preset threshold, the first matching parameter information is updated using a preset strategy until the minimum reflection point or the maximum number of iterations is reached. The preset strategy is based on iteratively adjusting the connection state of multiple capacitors and multiple inductors in the adjustable matching network unit.

[0032] Thirdly, embodiments of this application provide an adjustment device for a radio frequency matching network system, applied to the controller described in any of the above claims, the device comprising:

[0033] The detection module is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signal in the mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors.

[0034] The control module is used to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information.

[0035] In one or more embodiments, the preset event includes at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflection power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

[0036] In one or more embodiments, the control module is further configured to:

[0037] Obtain the reflected power or VSWR of the radio frequency matching network system;

[0038] If the reflected power or the standing wave ratio is greater than a third preset threshold, the first matching parameter information is updated using a preset strategy until the minimum reflection point or the maximum number of iterations is reached. The preset strategy is based on iteratively adjusting the connection state of multiple capacitors and multiple inductors in the adjustable matching network unit.

[0039] Fourthly, embodiments of this application provide a controller, including: a memory and a processor;

[0040] The memory stores computer-executed instructions;

[0041] The processor executes computer execution instructions stored in the memory, causing the processor to perform the second aspect and / or various possible implementations of the second aspect as described above.

[0042] Fifthly, embodiments of this application provide a terminal, including: the radio frequency matching network system described in any one of the preceding claims;

[0043] The controller in the radio frequency matching network system is used to perform the second aspect and / or various possible implementations of the second aspect as described above.

[0044] In a sixth aspect, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the second aspect and / or various possible implementations of the second aspect as described above.

[0045] In a seventh aspect, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the second aspect and / or various possible implementations of the second aspect as described above.

[0046] The radio frequency matching network system, adjustment method, and terminal provided in this application embodiment include: an adjustable matching network unit, a controller, and a drive execution unit. The adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors. The controller is connected to the adjustable matching network unit and is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signals in a mapping table after detecting a preset event trigger. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors. The drive execution unit is connected to both the controller and the adjustable matching network unit. The controller is also used to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information. In this scheme, when a preset event is triggered, the controller can immediately retrieve the first matching parameter corresponding to the current frequency band from the mapping table. The drive unit then quickly configures the network to the preset capacitor and inductor connection state, realizing instantaneous matching of antenna impedance. This bypasses the time-consuming initial search and trial-and-error process in the current scheme, reducing the response time of the matching network from milliseconds to microseconds. This significantly reduces the instantaneous impedance mismatch window caused by frequency band switching or sudden environmental changes, effectively avoiding communication interruptions and power reflection peaks caused by matching lag, and ensuring the instantaneous stability and continuous high efficiency of the RF link in multi-band rapid switching and dynamic environments. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0048] Figure 1 A first structural schematic diagram of the radio frequency matching network system provided in this application;

[0049] Figure 2 A schematic diagram of the first structure of the adjustable matching network unit provided in this application;

[0050] Figure 3 A second structural schematic diagram of the adjustable matching network unit provided in this application;

[0051] Figure 4 A schematic diagram illustrating the interaction between the drive execution unit and the adjustable matching network unit provided in this application;

[0052] Figure 5 A second structural schematic diagram of the radio frequency matching network system provided in this application;

[0053] Figure 6 This is a schematic diagram of the structure of the dual directional coupler provided in this application;

[0054] Figure 7 A schematic diagram of the signal conversion unit provided in this application;

[0055] Figure 8 A schematic diagram of the packaging of the radio frequency matching network system provided in this application;

[0056] Figure 9 A first flowchart illustrating the adjustment method of the radio frequency matching network system provided in this application;

[0057] Figure 10 A second flowchart illustrating the adjustment method for the radio frequency matching network system provided in this application;

[0058] Figure 11 A third flowchart illustrating the adjustment method for the radio frequency matching network system provided in this application;

[0059] Figure 12 A schematic diagram of the adjustment device for the radio frequency matching network system provided in this application;

[0060] Figure 13 This is a schematic diagram of the controller provided in this application;

[0061] Figure 14 A schematic diagram of the terminal provided in this application.

[0062] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0063] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0064] Terminology Explanation:

[0065] FPGA: Field Programmable Gate Array, used to implement logic control and tuning algorithm logic;

[0066] ADC: Analog-to-Digital Converter, an electronic device that converts continuously changing analog signals into discrete digital signals;

[0067] VSWR: Voltage Standing Wave Ratio, used to assess the degree of matching;

[0068] SIP: System-in-Package, which integrates multiple devices into a single package module;

[0069] MEMS: Microelectromechanical systems, which can be used for switch control or adjustable capacitor arrays;

[0070] π-type network: a classic impedance matching structure with a symmetrical two parallel and one series structure.

[0071] In the radio frequency transmission link of wireless communication terminals (such as smartphones, walkie-talkies, satellite communication terminals, etc.), the antenna is usually connected to the power amplifier through a fixed matching network to ensure efficient radiation of radio frequency energy.

[0072] However, the input impedance of the antenna can change drastically when the terminal is in different usage environments. For example, holding the terminal, unfolding the terminal, placing it near a person's head, or putting the device in a pocket can all alter the electromagnetic environment around the antenna, causing the antenna impedance to deviate from the design value.

[0073] Studies have shown that when an antenna is held tightly against the hand, its radiation efficiency can plummet from approximately 90% to 20%. In extreme cases where both the hand and head are involved, the total antenna loss can reach as high as 26 dB. This impedance mismatch causes severe power reflection, with unradiated energy bouncing back to the power amplifier. This not only reduces transmission efficiency but may also potentially damage power amplifiers and other devices or trigger power protection mechanisms.

[0074] In existing technologies, the following methods are typically used to mitigate the effects of hand grip and environmental factors:

[0075] Firstly, a compromise can be made in antenna design to ensure performance in both idle and disturbed environments, but this approach often sacrifices efficiency under ideal conditions.

[0076] Secondly, adding multiple antennas or switchable antenna configurations allows switching to a backup antenna when an impedance change is detected. However, with the increase in the number of antennas and the expansion of frequency bands in mobile terminals, solutions such as "dual antenna switching" are difficult to cover all frequency bands and scenarios, and are also complex to implement.

[0077] Thirdly, some high-end equipment has introduced tunable components (such as variable capacitor diodes) for matching network tuning, but there are still problems such as limited tuning range, slow control response speed or introduction of active losses, which cannot fully meet the needs of real-time and rapid changes.

[0078] To address the technical problems existing in current methods, the inventors of this application propose the following: While current adaptive matching networks can respond to environmental changes, their closed-loop process from detection and calculation to adjustment has inherent delays. Impedance mismatch windows form at the moment of frequency band switching, leading to instantaneous power reflection and communication quality fluctuations. If complex real-time calculations can be transformed into efficient table lookup operations, and the empirically optimal matching state for each known frequency band can be pre-fixed into hardware-executable switching instructions, then when a frequency band switching event occurs, there is no need to wait for feedback signals for iterative searching. Instead, the pre-stored impedance connectivity combinations are directly invoked, driving the π-type network to complete coarse matching in one step. This transforms the dynamic problem into a static mapping, thereby eliminating the matching delay problem at its source.

[0079] Based on the above technical concept, the technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0080] Figure 1 The first structural schematic diagram of the radio frequency matching network system provided in this application is as follows: Figure 1 As shown, the radio frequency matching network system includes: an adjustable matching network unit, a controller, and a drive execution unit. The adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors.

[0081] The controller is connected to an adjustable matching network unit and is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signal in the mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors.

[0082] In this implementation, after the controller detects the triggering of a preset event, it immediately starts the tuning process and quickly determines the first matching parameter information corresponding to the current frequency band from its built-in mapping table. The mapping table stores the correspondence between each frequency band and the corresponding matching parameter information in advance. Each record contains multiple combinations of the connection states of multiple adjustable capacitors and multiple adjustable inductors, so as to quickly provide an initial matching scheme after the frequency band is switched.

[0083] Optionally, the preset event includes at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflected power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

[0084] The drive execution unit is connected to the controller and the adjustable matching network unit respectively. The controller is also used to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information.

[0085] In this implementation, the drive execution unit serves as the interface between the controller and the adjustable matching network, connecting to both. The controller generates corresponding control commands based on the first matching parameter information obtained from the mapping table and sends them to the drive execution unit. After receiving the commands, the drive execution unit converts them into specific control levels to adjust the connection state of the switches corresponding to each capacitor and inductor in the adjustable matching network, thereby achieving initial adjustment of the matching network.

[0086] Optionally, the process for mapping the table can be as follows: by combining simulation and actual measurement, impedance data of the antenna in different postures (such as free space, hand grip, close to the human body, etc.) are collected in multiple frequency bands; based on these impedance data, a set of capacitor and inductor connection state combinations that can enable the antenna and the transmitting circuit to achieve good initial matching is calculated for each frequency band, and this is used as the default matching parameter for that frequency band; then, the optimal matching parameter combination of each frequency band and its corresponding combination is pre-stored in the controller's memory in the form of a mapping table.

[0087] For example, the controller may be a controller module FPGA.

[0088] The radio frequency matching network system provided in this application includes: an adjustable matching network unit, a controller, and a drive execution unit. The adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors. The controller is connected to the adjustable matching network unit and is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signals in a mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes the connection state of multiple capacitors and the connection state of multiple inductors. The drive execution unit is connected to both the controller and the adjustable matching network unit. The controller is also used to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information. In this scheme, when a preset event is triggered, the controller can immediately retrieve the first matching parameter corresponding to the current frequency band from the mapping table. The drive unit then quickly configures the network to the preset capacitor and inductor connection state, realizing instantaneous matching of antenna impedance. This bypasses the time-consuming initial search and trial-and-error process in the current scheme, reducing the response time of the matching network from milliseconds to microseconds. This significantly reduces the instantaneous impedance mismatch window caused by frequency band switching or sudden environmental changes, effectively avoiding communication interruptions and power reflection peaks caused by matching lag, and ensuring the instantaneous stability and continuous high efficiency of the RF link in multi-band rapid switching and dynamic environments.

[0089] Based on the above embodiments, Figure 2 The first structural schematic diagram of the adjustable matching network unit provided in this application is as follows: Figure 2 As shown, the adjustable matching network unit includes: a first capacitor module, an inductor module, and a second capacitor module connected to the first capacitor module via the inductor module;

[0090] The first capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units; the second capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units; the inductor module includes: multiple series inductors arranged in binary and connected in parallel with switching units.

[0091] In this implementation, both the first capacitor module and the second capacitor module adopt a parallel structure, consisting of multiple capacitors, and each capacitor is connected in series with an independent switching unit (such as a MEMS switch or a PIN diode switch). By controlling the on / off state of each switch, a variety of capacitance values ​​can be combined to achieve precise and wide-range digital tuning of the parallel capacitors at the antenna port.

[0092] The inductor module is located between the first capacitor module and the second capacitor module. It consists of multiple series inductors, and each inductor has a switch unit connected in parallel across its two ends. When a switch unit is closed, its corresponding inductor is short-circuited and thus removed from the series path. By controlling the state of these parallel switches, the total value of the series inductors can be adjusted in a stepwise manner, working in conjunction with the two capacitor modules to cover the impedance matching requirements of a wide frequency band.

[0093] Furthermore, arranging them in binary means designing the values ​​of multiple components of the same type (capacitors or inductors) into binary multiples.

[0094] Optionally, the number of capacitors in both the first capacitor module and the second capacitor module is 8; the number of inductors in the inductor module is 8.

[0095] For example, Figure 3 A second structural schematic diagram of the adjustable matching network unit provided in this application is shown below. Figure 3 As shown:

[0096] 1) Taking the first capacitor module or the second capacitor module as an example, it includes 8 capacitors: C1, C2, C3, C4, C5, C6, C7 and C8.

[0097] The corresponding capacitance values ​​are: 2*C1=C2; 2*C2=C3, 2*C3=C4, 2*C4=C5, 2*C5=C6, 2*C6=C7, 2*C7=C8.

[0098] 2) Taking the inductor module as an example, it includes 8 inductors: L1, L2, L3, L4, L5, L6, L7, and L8.

[0099] The numerical relationships of their corresponding sensing values ​​are: 2*L1=L2, 2*L2=L3, 2*L3=L4, 2*L4=L5, 2*L5=L6, 2*L6=L7, 2*L7=L8.

[0100] Accordingly, the matching parameter information mentioned above is actually the switching state of the switching units corresponding to the inductors and capacitors in the first capacitor module, the second capacitor module, and the inductor module.

[0101] Optionally, the controller is used to generate SPI control commands based on the first matching parameter information and send them to the drive execution unit;

[0102] The drive execution unit converts SPI control commands into 24-bit GPO 0 / 1 digital signals to control the on / off state of each switch unit in the adjustable matching network unit.

[0103] In this implementation, after the controller completes the event triggering and determines the first matching parameter information from the mapping table, it converts the first matching parameter information into specific executable control instructions. The controller (e.g., FPGA) integrates a communication interface and a logic processing module. Based on the first matching parameter information (i.e., the preset combination of capacitor and inductor switch states), it generates corresponding SPI control instructions. The SPI control instructions are a set of digital signals that follow the SPI communication protocol and contain control data such as the switch unit position and on / off state that need to be set.

[0104] The drive execution unit contains an SPI slave interface, instruction decoding logic, and level drive circuit. After receiving the SPI instruction, it uses the decoding logic to parse it into control bits that correspond one-to-one with each physical switch in the adjustable matching network.

[0105] That is, the drive execution unit converts these control bits into 24-bit GPO (General Purpose Output) 0 / 1 digital signals, with each bit corresponding to the control line of a specific switching unit in the network. By outputting a high or low level, the switching unit (such as a MEMS switch or a PIN diode) is directly driven to turn on or off, thereby precisely setting the state of all switching units in the first capacitor module, inductor module, and second capacitor module, achieving rapid configuration of the matching network impedance.

[0106] For example, its implementation effect is similar. Figure 4 As shown, Figure 4 This is a schematic diagram illustrating the interaction between the drive execution unit and the adjustable matching network unit provided in this application.

[0107] The RF matching network system provided in this application includes an adjustable matching network unit comprising: a first capacitor module, an inductor module, and a second capacitor module connected to the first capacitor module via the inductor module. The first capacitor module comprises multiple parallel capacitors arranged in binary order and connected in series with switching units. The second capacitor module comprises multiple parallel capacitors arranged in binary order and connected in series with switching units. The inductor module comprises multiple series inductors arranged in binary order and connected in parallel with switching units. In this scheme, the binary capacitor arrays of the first and second capacitor modules of the adjustable matching network unit provide an exponential tuning range, achieving both coarse and fine-level coverage of the capacitive component in the load impedance. The introduction of parallel switches in the inductor module allows for selective bypassing of the series inductance value, thereby flexibly adjusting the inductive component of the network. This structure decouples the complex impedance matching problem into digital control of three independent modules, enabling the controller to generate a nearly continuous impedance transformation curve by combining a limited number of switching states, ensuring ultra-wideband coverage while maintaining a fast tuning speed.

[0108] Figure 5 The second structural diagram of the radio frequency matching network system provided in this application is as follows: Figure 5 As shown, the RF matching network system also includes: a dual directional coupler and a signal conversion unit (i.e., a power sampling and ADC module) connected to the dual directional coupler.

[0109] The dual directional couplers are connected to the adjustable matching network unit and the antenna respectively, and are used to detect the incident power signal output by the adjustable matching network unit and the reflected power signal fed back by the antenna.

[0110] For example, in combination Figure 6 The dual directional coupler is described below. Figure 6 This is a schematic diagram of the dual directional coupler provided in this application.

[0111] In this implementation, dual directional couplers are directly connected in series between the output of the adjustable matching network unit and the antenna. Utilizing the principle of directional coupling, non-intrusive sampling of the signal on the transmission line is performed simultaneously: the incident power signal flowing to the antenna is extracted from one coupling port, and the reflected power signal reflected back by the antenna due to impedance mismatch is extracted from the other coupling port.

[0112] The signal conversion unit is used to convert the incident power signal and the reflected power signal into first digital signals, respectively;

[0113] In this implementation, the signal conversion unit is connected to the two output ports of the dual directional coupler and is responsible for converting the coupled incident power signal or reflected power signal into digital information that the controller can process, denoted as the first digital signal.

[0114] The controller is connected to the signal conversion unit and is used to update the first matching parameter information according to the first digital signal.

[0115] In this implementation, the controller is connected to the signal conversion unit through a digital interface (such as SPI) and continuously receives the first digital signal. After completing the fast coarse adjustment based on the mapping table, the controller enters the fine adjustment stage.

[0116] During this stage, the controller determines the incident and reflected power digital values ​​based on the received first digital signal and calculates the current reflection coefficient or standing wave ratio in real time. By comparing this value with a preset threshold, if the threshold is not met, the controller runs a built-in adaptive tuning algorithm to dynamically and iteratively update the first matching parameter information based on feedback information. For detailed implementation details, please refer to [link to relevant documentation]. Figure 10 The illustrated embodiment.

[0117] Optional, Figure 7 A schematic diagram of the signal conversion unit provided in this application is shown below. Figure 7 As shown, the signal conversion unit includes: a single-pole double-throw switch, a detector, and an analog-to-digital converter connected in sequence;

[0118] A single-pole double-throw switch is used to select whether to detect incident power signal or reflected power signal;

[0119] In this implementation, the single-pole double-throw switch is the signal routing selector of the signal conversion unit. Its input ports are connected to the two outputs of the dual directional coupler (one outputs the incident power signal, and the other outputs the reflected power signal).

[0120] Under the timing control of the controller, the single-pole double-throw switch selects, in a time-division manner, to connect the incident power signal or the reflected power signal to the subsequent processing link according to the detection requirements.

[0121] The detector is used to convert the incident power signal or the reflected power signal into a first analog signal;

[0122] In this implementation, the detector is the core component responsible for power-to-voltage conversion. It receives the radio frequency power signal (whether it is the incident power signal or the reflected power signal) selected by the single-pole double-throw switch, and uses its nonlinear characteristics to linearly convert the power information of the radio frequency signal into a proportional DC voltage, i.e., the first analog signal.

[0123] An analog-to-digital converter is used to convert a first analog signal into a first digital signal.

[0124] In this implementation, the analog-to-digital converter receives a first analog signal (DC voltage) from the detector output. Under the control of the sampling clock of the controller, this continuously changing analog voltage is periodically sampled and quantized, converting it into a discrete first digital signal that can be directly read and processed by a digital system (such as an FPGA).

[0125] Optional, Figure 8 A schematic diagram of the packaging of the radio frequency matching network system provided in this application is shown below. Figure 8 As shown, the package integrates the following components: an adjustable matching network unit (switch array, capacitors and inductors can be arranged in a π-type network in an LTCC multilayer dielectric to further reduce size), a drive execution unit, a dual directional coupler chip, and a signal conversion unit.

[0126] The package side features standard pins or pads (interfaces include: RF_IN, RF_OUT, SPI_CLK, SPI_DATA_OUT, SPI_CS, SPI_DATA_IN, power, status signals, etc.). The package material can utilize a low-temperature co-fired ceramic (LTCC) structure, supporting thermal management and EMC shielding design, which is beneficial for improving overall RF performance and mass production.

[0127] It should be understood that the RF matching network system involved in this application is implemented using SIP packaging, which has significant necessity and engineering advantages in communication terminals. SIP packaging helps to integrate capacitors, inductor arrays, directional couplers, ADCs, and control drive circuits into a single RF front-end module with high density, significantly reducing size, improving reliability, and simplifying overall wiring design. SIP also supports standard digital interfaces, facilitating decoupling control from the main control system and enhancing modular deployment capabilities.

[0128] The RF matching network system provided in this application embodiment further includes: a dual directional coupler and a signal conversion unit connected to the dual directional coupler; the dual directional coupler is connected to an adjustable matching network unit and an antenna respectively, and is used to detect the incident power signal output by the adjustable matching network unit and the reflected power signal fed back by the antenna; the signal conversion unit is used to convert the incident power signal and the reflected power signal into a first digital signal respectively; the controller is connected to the signal conversion unit and is used to update the first matching parameter information according to the first digital signal. In this RF matching network system, the dual directional coupler non-invasively separates the incident and reflected power signals, accurately capturing the instantaneous changes in the antenna impedance; the signal conversion unit quantizes the analog power into a digital signal, providing accurate feedback data for the controller, enabling the controller to dynamically fine-tune the matching parameters according to the actual reflected power after fast coarse matching based on frequency band mapping, realizing adaptive adjustment from open-loop preset to closed-loop. This not only ensures that the matching accuracy can reach the theoretical optimal value in complex dynamic environments, but also compensates for errors caused by device tolerances, temperature drift, and environmental disturbances through real-time feedback, solving the fundamental contradiction between insufficient pre-matching accuracy and poor environmental adaptability in current solutions.

[0129] Based on the above system embodiments, the adjustment method of the radio frequency matching network system is described below, taking the controller in the radio frequency matching network system as the execution subject.

[0130] Figure 9 A first flowchart illustrating the modulation method for the radio frequency matching network system provided in this application is shown below. Figure 9 As shown, the method includes:

[0131] Step 91: After detecting the triggering of a preset event, determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signals in the mapping table;

[0132] The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors.

[0133] In this step, after a preset event is detected, the matching parameter information corresponding to the frequency band of the current transmit / receive signal is searched from the preset mapping table and recorded as the first matching parameter information.

[0134] This mapping table is a database established in advance through simulation and actual measurement. It records the specific configuration required for the antenna to achieve the best initial matching under each operating frequency band, namely the matching parameter information. It precisely includes the target connection state (on or off) of each switching unit of the first capacitor module and the second capacitor module in the adjustable matching network, as well as the target connection state (on or off) of each switching unit in the inductor module.

[0135] Optionally, the preset events include at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflected power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

[0136] In this implementation, the radio frequency matching network system corresponds to the terminal switching network frequency band: when the baseband or radio frequency main control chip issues an instruction to switch the communication frequency band (e.g., from LTE Band 1 to Band 3), the instruction is received by the controller as a clear event signal, triggering the matching process to quickly adapt to the impedance characteristics of the new frequency band.

[0137] If the reflected power or VSWR of the RF matching network system exceeds a first preset threshold: The reflected power or calculated VSWR is continuously (or event-wise) monitored via dual directional couplers and a signal conversion unit. When the monitored value exceeds a set threshold (e.g., VSWR > 2.0), it indicates that the current impedance mismatch has severely impacted efficiency, and tuning is immediately triggered to restore performance.

[0138] The terminal's attitude change exceeds a second preset threshold: The terminal's built-in attitude sensors (such as accelerometers and gyroscopes) detect the device's physical state in real time. When a significant change in attitude is detected (e.g., from being placed flat on a table to being held against the ear), and the change exceeds a preset threshold, the sensor notifies the controller as an event, predicting a drastic change in antenna impedance, thereby initiating matching adjustments in advance or immediately.

[0139] That is, the controller can be triggered by preset events, such as attitude sensing, external events, or ADC value reporting via SPI; and it can send adjustment parameters, i.e., the first matching parameter information, based on SPI.

[0140] Step 92: Based on the first matching parameter information, control the drive execution unit to adjust the adjustable matching network unit.

[0141] In this step, a specific control instruction is generated based on the first matching parameter information obtained from the mapping table, and this control instruction is sent to the drive execution unit through the SPI interface.

[0142] Subsequently, after receiving the instruction, the drive execution unit decodes it and converts it into corresponding multi-channel digital control level signals (e.g., 24-bit GPO signals). These level signals directly act on each switching unit in the adjustable matching network unit. By precisely controlling the on / off state of these switches, the component combination state of the first capacitor module, inductor module, and second capacitor module can be quickly set to the configuration specified by the first matching parameter information, thereby completing the network matching in a very short time (e.g., on the order of hundreds of microseconds).

[0143] The adjustment method for the RF matching network system provided in this application, after detecting a preset event, determines the first matching parameter information corresponding to the current frequency band of the transmit and receive signals in a mapping table. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information, and each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors. According to the first matching parameter information, the control drive execution unit adjusts the adjustable matching network unit. In this scheme, when a preset event such as frequency band switching is detected, the controller does not need to start a time-consuming iterative algorithm. It can directly extract the pre-optimized and stored combination of capacitor and inductor connection states from the mapping table and drive the execution unit to instantly complete the network configuration. This eliminates the impedance mismatch window caused by the calculation lag during frequency band switching in current adaptive matching, thereby fundamentally avoiding power reflection spikes and communication interruptions during the switching process. It achieves near-seamless switching of RF link states under multi-frequency band communication, significantly improving the system's real-time performance, stability, and energy efficiency.

[0144] Based on the above method embodiments, Figure 10 The second flowchart illustrating the adjustment method for the radio frequency matching network system provided in this application is shown below. Figure 10 As shown, the method also includes:

[0145] Step 101: Obtain the reflected power or VSWR of the radio frequency matching network system;

[0146] In this step, the controller acquires the key performance indicators of the RF matching network system in real time or on demand through the signal conversion unit, namely the incident power and reflected power of the antenna port continuously sampled by the dual directional coupler.

[0147] The signal conversion unit converts the two analog power signals into digital signals and reports them. The controller directly calculates the current reflected power amplitude based on the acquired incident and reflected power digital values, or further calculates the standing wave ratio, which serves as the core quantitative basis for evaluating the impedance matching degree between the current matching network and the antenna.

[0148] Step 102: If the reflected power or VSWR is greater than the third preset threshold, the first matching parameter information is updated using a preset strategy until the minimum reflection point or the maximum number of iterations is reached.

[0149] The preset strategy is based on iteratively adjusting the connectivity of multiple capacitors and multiple inductors in the adjustable matching network unit.

[0150] In this step, the controller compares the calculated reflected power or VSWR with a third preset threshold.

[0151] Once the reflected power or standing wave ratio is found to be greater than the third preset threshold (e.g., VSWR > 1.5), it indicates that... Figure 9The adjusted matching state of the illustrated embodiment still needs further fine-tuning, and the controller then initiates a closed-loop fine-tuning process based on a preset strategy.

[0152] The controller attempts to change the connection state of a capacitor or an inductor in the adjustable matching network unit in a specific order (e.g., from the most significant bit to the least significant bit) sequentially (i.e., toggling the state of a switching unit), and then resamples the reflection index; by comparing the index before and after the adjustment, it decides whether to retain the change.

[0153] This process is repeated iteratively, updating the first matching parameter information and gradually approaching the minimum reflection point. The loop terminates when the optimal match is found (the reflection index is below the threshold) or when the maximum number of iterations is reached (to prevent the algorithm from looping indefinitely), ultimately locking in the optimal switch combination, which is the updated final first matching parameter information.

[0154] The adjustment method for the RF matching network system provided in this application obtains the reflected power or VSWR of the RF matching network system. If the reflected power or VSWR is greater than a third preset threshold, a preset strategy is used to update the first matching parameter information until the minimum reflection point or the maximum number of iterations is reached. The preset strategy is based on iteratively adjusting the connection state of multiple capacitors and multiple inductors in the adjustable matching network unit. This scheme introduces a closed-loop fine-tuning mechanism based on real-time monitoring of reflected power / VSWR and a preset strategy of iterative adjustment, that is, finely adjusting the switching state of the capacitor and inductor array in a binary search manner, accurately approximating the theoretical minimum reflection point on a complex impedance plane. This not only enables rapid initial matching for frequency band switching, but also dynamically adapts to impedance disturbances caused by subtle environmental changes such as hand grip and temperature, pushing the matching accuracy to the limit. At the same time, the setting of the maximum number of iterations serves as a safety boundary, effectively preventing the algorithm from getting trapped in local optima or infinite loops, ensuring the reliability and real-time performance of the tuning process, and ultimately enabling the system to maintain theoretically optimal radiation efficiency and signal integrity in dynamic environments.

[0155] Based on the above method embodiments, Figure 11 The third flowchart illustrating the adjustment method for the radio frequency matching network system provided in this application is shown below. Figure 11 As shown, the method includes:

[0156] Step 110: Maintain low power / sleep state;

[0157] Step 111: Determine if a preset event has been triggered. If yes, proceed to step 112; otherwise, proceed to step 110.

[0158] Step 112: Drive the execution unit to pre-coarse adjustment state; quickly set the coarse adjustment state according to the parameters matched by the frequency band mapping table;

[0159] Step 113: Quickly convert the issued parameters into parameters that match the network and then issue them;

[0160] Step 114: Feedback the forward and reverse power parameters based on the latest matching status;

[0161] Step 115: The signal conversion unit reports the positive / reverse voltage and performs standing wave calculation;

[0162] Step 116: Determine if the forward / reverse VSWR is lower than the set threshold. If yes, proceed to step 117; otherwise, proceed to step 119.

[0163] Step 117: Tuning complete, lock current state;

[0164] Step 118: End, return to step 110;

[0165] Step 119: Determine if the minimum reflection point / maximum number of iterations has been reached? If yes, proceed to step 117; if no, proceed to step 120.

[0166] Step 120: Continue setting the fine-tuning status; proceed to step 113.

[0167] The adjustment method for the radio frequency matching network system and the system described above provided in this application have the following technical effects:

[0168] Technical Effect 1: A fast coarse-tuning mechanism based on frequency band mapping improves multi-frequency matching response speed and system stability. Because communication terminals operate on multiple frequency bands and switch frequently, traditional multi-branch matching structures require retuning during switching and lack a preset path, leading to matching lag and communication interruptions during switching. This application presets the impedance matching state (capacitor / inductor combination) corresponding to each frequency band in the controller. Once a frequency band switch occurs, the controller can immediately call the corresponding state for coarse-tuning matching, greatly shortening the response time. This strategy directly solves the problem of response lag under multi-frequency bands, enabling the terminal to maintain good transmission efficiency during frequency band switching, improving communication stability and system real-time performance.

[0169] Technical Effect 2: Event-triggered tuning mechanism effectively reduces system power consumption and enhances tuning adaptability. Most advanced closed-loop tuning systems in existing technologies employ continuous operation, without distinguishing between impedance changes or tuning necessity. Long-term sampling and calculation result in excessive energy consumption, making them particularly unsuitable for power-sensitive mobile terminal scenarios. This application innovatively introduces an event-triggered mechanism, where the controller initiates the tuning process only when key events such as frequency band switching commands, reflected power exceeding the threshold, or attitude changes are detected. By "starting on demand" rather than "running continuously" the tuning process, not only is power consumption significantly reduced, but resource utilization efficiency is also improved, making the matching system more intelligent and efficient, fundamentally solving the problem of the incompatibility between low-power operation and dynamic matching.

[0170] Technical Effect 3: Improved matching accuracy and dynamic adaptability through a closed-loop tuning mechanism based on dual directional couplers and feedback control. In traditional adjustable matching networks, switch configuration is usually achieved through table lookup or coarse setting, lacking a real-time feedback control path, resulting in low tuning accuracy and difficulty in adapting to complex load changes. This application introduces bidirectional couplers into the structure in conjunction with ADC sampling to monitor the incident and reflected power on the antenna feed line in real time. After the controller calculates the error between the current matching state and the desired state, it dynamically adjusts the matching network configuration, forming a closed-loop tuning mechanism based on reflection feedback. This design significantly improves matching accuracy and stability in dynamic environments, especially in rapidly changing scenarios such as terminal holding and obstruction, maintaining approximate matching of the transmission link, fundamentally solving the communication degradation problem caused by attitude changes.

[0171] Technical Benefit 3: Modular integrated packaging design improves system integration, portability, and anti-interference capabilities. Currently, most matching solutions adopt a discrete layout, with the matching network, detection circuit, and controller distributed in different areas of the terminal, resulting in complex wiring, increased electromagnetic interference, long design cycles, and difficulty in modular reuse. This application integrates the matching network, dual directional coupler, sampling module, and drive control logic into a single package module, and communicates with the main controller through a standard SPI interface, forming a fully functional and clearly defined RF matching subsystem. This modular design greatly reduces the complexity of terminal design, improves system portability and standardization, and enhances anti-interference capabilities through electromagnetic isolation and short-path wiring within the module, overcoming the engineering implementation bottlenecks of current structures from both packaging process and system architecture perspectives.

[0172] Based on the above method embodiments, Figure 12 A schematic diagram of the adjustment device for the radio frequency matching network system provided in this application is shown below. Figure 12 As shown, the adjustment device for the radio frequency matching network system is applied to the aforementioned controller, and the device includes:

[0173] The detection module 121 is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signal in the mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes the connection state of multiple capacitors and the connection state of multiple inductors.

[0174] The control module 122 is used to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information.

[0175] In one or more embodiments, the preset event includes at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflected power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

[0176] In one or more embodiments, the control module 122 is further configured to:

[0177] Obtain the reflected power or VSWR of the radio frequency matching network system;

[0178] If the reflected power or VSWR is greater than the third preset threshold, the first matching parameter information is updated using a preset strategy until the minimum reflection point or the maximum number of iterations is reached. The preset strategy is based on iteratively adjusting the connection state of multiple capacitors and multiple inductors in the adjustable matching network unit.

[0179] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical element, or they can be physically separated. Furthermore, these modules can be implemented entirely in software through processing element calls, or entirely in hardware. Alternatively, some modules can be implemented through processing element calls in software, while others can be implemented in hardware. Moreover, these modules can be integrated together or implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. During implementation, each step of the above method or each of the above modules can be completed through the integrated logic circuits in the hardware of the processor element or through software instructions.

[0180] As can be seen from the above, the adjustment device of the radio frequency matching network system provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0181] Figure 13 This is a schematic diagram of the controller provided in this application. Figure 13 As shown, the controller provided in this embodiment includes at least one processor 131 and a memory 132.

[0182] Optionally, the controller also includes a communication component 133.

[0183] The processor 131, memory 132 and communication component 133 are connected via bus 134.

[0184] In a specific implementation, at least one processor 131 executes computer execution instructions stored in memory 132, causing at least one processor 131 to perform the above-described method.

[0185] The specific implementation process of processor 131 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0186] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0187] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0188] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0189] Based on the above embodiments, Figure 14 This is a schematic diagram of the structure of the terminal provided in this application, such as... Figure 14 As shown, the terminal includes: a radio frequency matching network system;

[0190] The controller in the radio frequency matching network system is used to execute the adjustment method of the radio frequency matching network system described above.

[0191] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0192] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0193] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0194] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0195] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0196] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0197] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0198] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0199] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0200] Finally, it should be noted that other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and alterations may be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A radio frequency matching network system, characterized in that, include: The adjustable matching network unit, controller, and drive execution unit are included. The adjustable matching network unit is a tuned network with a π-type topology constructed using multiple capacitors and multiple inductors. The controller is connected to the adjustable matching network unit and is used to determine the first matching parameter information corresponding to the current frequency band of the transmitted and received signal in the mapping table after a preset event is detected. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors. The drive execution unit is connected to the controller and the adjustable matching network unit respectively. The controller is further configured to control the drive execution unit to adjust the adjustable matching network unit according to the first matching parameter information.

2. The system according to claim 1, characterized in that, The adjustable matching network unit includes: a first capacitor module, an inductor module, and a second capacitor module connected to the first capacitor module via the inductor module; The first capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units; The second capacitor module includes: multiple parallel capacitors arranged in binary and connected in series with switching units; The inductor module includes: multiple series inductors arranged in binary and each connected in parallel with a switching unit.

3. The system according to claim 2, characterized in that, Both the first capacitor module and the second capacitor module contain 8 capacitors. The inductor module contains eight inductors.

4. The system according to any one of claims 2 or 3, characterized in that, The controller is used to generate SPI control commands based on the first matching parameter information and send them to the drive execution unit; The drive execution unit converts the SPI control commands into 24-bit GPO 0 / 1 digital signals to control the on / off state of each switch unit in the adjustable matching network unit.

5. The system according to any one of claims 1-3, characterized in that, The system further includes: a dual directional coupler and a signal conversion unit connected to the dual directional coupler; The dual directional coupler is connected to the adjustable matching network unit and the antenna respectively, and is used to detect the incident power signal output by the adjustable matching network unit and the reflected power signal fed back by the antenna; The signal conversion unit is used to convert the incident power signal and the reflected power signal into first digital signals respectively; The controller is connected to the signal conversion unit and is used to update the first matching parameter information according to the first digital signal.

6. The system according to claim 5, characterized in that, The signal conversion unit includes: a single-pole double-throw switch, a detector, and an analog-to-digital converter connected in sequence; The single-pole double-throw switch is used to select the incident power signal or the reflected power signal for detection. The detector is used to convert the incident power signal or the reflected power signal into a first analog signal; The analog-to-digital converter is used to convert the first analog signal into the first digital signal.

7. A method for adjusting a radio frequency matching network system, characterized in that, Applied to the controller according to any one of claims 1-6, the method comprises: After a preset event is detected, the first matching parameter information corresponding to the current frequency band of the transmitted and received signal is determined in the mapping table. The mapping table records the correspondence between multiple frequency bands and multiple matching parameter information. Each matching parameter information includes: the connection state of multiple capacitors and the connection state of multiple inductors. Based on the first matching parameter information, the control drive execution unit adjusts the adjustable matching network unit.

8. The method according to claim 7, characterized in that, The preset events include at least one of the following: the terminal corresponding to the radio frequency matching network system switches network frequency bands, the reflection power or standing wave ratio of the radio frequency matching network system is greater than a first preset threshold, and the attitude change of the terminal is greater than a second preset threshold.

9. The method according to claim 7 or 8, characterized in that, The method further includes: Obtain the reflected power or VSWR of the radio frequency matching network system; If the reflected power or the standing wave ratio is greater than a third preset threshold, the first matching parameter information is updated using a preset strategy until the minimum reflection point or the maximum number of iterations is reached. The preset strategy is based on iteratively adjusting the connection state of multiple capacitors and multiple inductors in the adjustable matching network unit.

10. A terminal, characterized in that, include: The radio frequency matching network system according to any one of claims 1-6; The controller in the radio frequency matching network system is used to perform the adjustment method according to any one of claims 7-9.

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