Wireless communication terminal, antenna frequency adjustment method, storage medium, and program product

Abstract

The invention relates to the technical field of communication, and provides a wireless communication terminal, an antenna frequency adjustment method, a storage medium and a program product. The main board comprises a proximity sensor, a processing chip and a switch, and further comprises a first inductor and a first capacitor of which one ends are grounded; one end of the proximity sensor is connected with the processing chip, and the other end of the proximity sensor is connected with one end of the antenna; one end of the switch is connected with the processing chip, and the other end of the switch is connected between two ends of the antenna; the proximity sensor is used for detecting capacitance variation between the antenna and the mainboard and transmitting the capacitance variation to the processing chip; and the processing chip is used for matching the switching state based on the capacitance variable quantity, and controlling the switch to be connected with the other grounded end of the first capacitor, connected with the other grounded end of the first inductor or not connected with the first capacitor and the other grounded end of the first inductor according to the switching state. According to the application, the wireless communication terminal can meet the requirements of various application scenes, and the universality of the wireless communication terminal is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a wireless communication terminal, an antenna frequency adjustment method, a storage medium and a program product. Background Art

[0002] In wireless communication equipment, antennas are important signal receiving and transmitting devices. Their main function is to transform guided waves propagating on transmission lines into electromagnetic waves propagating in free space, or vice versa. Antennas are required in any wireless communication equipment and play an important role.

[0003] For example, the wireless communication terminal used for environmental information collection is used in the following scenarios: collecting environmental information data in forests or indoor and outdoor environments, and transmitting it back to the server background through wireless communication. For example, when a forest is on fire, smoke and temperature information is collected and the fire information is promptly transmitted back to the server background for alarm, or smoke and temperature information data is collected indoors and transmitted back. It can also be used as an outdoor sports emergency alarm terminal by people. Since the terminal usage scenarios are relatively complex, the electromagnetic properties of objects around and in contact with the surface of the terminal are different. When the terminal contacts different objects, such as the terminal is hung on a tree, or held in hand, or placed on a table, etc., the surrounding environment is not fixed, and the electromagnetic properties of the objects such as dielectric constant and loss are also different. Based on the basic principle of the antenna, it can be seen that when a medium is added to the space around the antenna, the antenna resonant frequency will be low. If the antenna resonant frequency deviates from the working frequency band, it will seriously affect the antenna performance, and further affect the communication performance of the wireless communication terminal.

[0004] Traditional methods can generally only limit the terminal usage scenarios, that is, no other objects can be close to the antenna, or the antenna bandwidth is made wide enough to ensure that when external objects such as trees or tables are close, the antenna resonant frequency is low but still within the working frequency band to ensure communication performance.

[0005] However, in order to ensure the communication performance of the antenna, the traditional solution limits the terminal application scenarios and requires that there are no other objects near the antenna, which affects the versatility of the terminal and makes it inconvenient to use. The antenna bandwidth is required to be wide enough to ensure that when the antenna frequency is offset, the antenna bandwidth can also be expanded within the working frequency band. Generally, the terminal needs to be larger in size, which affects convenience and is not beautiful. Moreover, it is difficult to expand the antenna bandwidth within a certain range of terminal size to meet the application scenario requirements. As a result, the versatility of wireless communication terminals is insufficient. Summary of the invention

[0006] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a wireless communication terminal, an antenna frequency adjustment method, a storage medium and a program product to improve the versatility of the wireless communication terminal.

[0007] According to the first aspect of the present application, a wireless communication terminal includes an antenna and a mainboard; the mainboard includes a proximity sensor, a processing chip and a switch, and the mainboard also includes a first inductor and a first capacitor with one end grounded; one end of the proximity sensor is connected to the processing chip, and the other end of the proximity sensor is connected to one end of the antenna; one end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna; The proximity sensor is used to detect the capacitance change between the antenna and the mainboard and transmit it to the processing chip; The processing chip is used to match the switch state based on the capacitance change, and control the switch to be connected to the other end of the first capacitor that is grounded, to be connected to the other end of the first inductor that is grounded, or to be disconnected from the other ends of both the first capacitor and the first inductor that are grounded according to the switch state.

[0008] According to one embodiment of the present application, the mainboard also includes a radio frequency circuit and a second inductor; one end of the radio frequency circuit is connected to the processing chip, and the other end is connected to one end of the antenna; one end of the second inductor is connected to the proximity sensor, and the other end of the second inductor is connected to one end of the antenna.

[0009] According to one embodiment of the present application, the mainboard also includes a second capacitor and a third inductor; one end of the second capacitor is connected to the RF circuit, and the other end of the second capacitor is connected to the antenna; one end of the third inductor is connected between the second capacitor and the RF circuit, and the other end of the third inductor is grounded.

[0010] According to one embodiment of the present application, the mainboard also includes a third capacitor and a fourth inductor; one end of the third capacitor is connected to the switch, and the other end of the third capacitor is connected to the antenna; one end of the fourth inductor is connected between the third capacitor and the switch, and the other end of the fourth inductor is grounded.

[0011] According to an embodiment of the present application, the mainboard further includes a mainboard ground; and the proximity sensor is also connected to the mainboard ground.

[0012] According to one embodiment of the present application, the antenna is a helical antenna.

[0013] According to a second aspect of the present application, an antenna frequency adjustment method applied to any of the above-mentioned wireless communication terminals includes: Determine the capacitance change between the antenna and the motherboard; matching a switch state based on the capacitance change; Switch control is performed according to the switch state to adjust the resonant frequency of the antenna.

[0014] According to an embodiment of the present application, matching the switch state based on the capacitance change includes: If the capacitance change is greater than or equal to a preset threshold, the switch state corresponding to the capacitance change is matched based on a preset matching rule; the preset matching rule includes a one-to-one corresponding association relationship between at least one capacitance change and at least one switch state.

[0015] According to the storage medium of the third aspect embodiment of the present application, the storage medium is a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the antenna frequency adjustment method as described in any one of the above is implemented.

[0016] A computer program product according to an embodiment of the fourth aspect of the present application includes a computer program, which, when executed by a processor, implements any of the above-mentioned antenna frequency adjustment methods.

[0017] The above one or more technical solutions in the embodiments of the present application have at least the following technical effects: By adding a proximity sensor and a switch to the mainboard of the wireless communication terminal, and connecting one end of the proximity sensor to a processing chip in the mainboard, and the other end of the proximity sensor to one end of the antenna in the wireless communication terminal, and connecting one end of the switch to the processing chip, and the other end of the switch to between the two ends of the antenna; thus, the capacitance change between the antenna and the mainboard can be detected by the proximity sensor and transmitted to the processing chip, thereby identifying the impact of the wireless communication terminal on the antenna in different scenarios, and then the processing chip can match the switch state based on the capacitance change, and control the switch to connect to the other end of the capacitor with one end grounded, to the other end of the inductor with one end grounded, or not to connect to the other end of the capacitor and the inductor with one end grounded, according to the switch state, so that the resonant frequency of the antenna can be adjusted back to the required frequency by loading the capacitor or inductor connected by the switch, so that the wireless communication terminal can meet the needs of various application scenarios and improve the versatility of the wireless communication terminal.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the internal circuit connection of the wireless communication terminal provided in an embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the internal architecture of the wireless communication terminal provided in an embodiment of the present application.

[0022] Figure 3 It is a flow chart of the antenna frequency adjustment method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0024] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] The present application provides a wireless communication terminal, an antenna frequency adjustment method, a storage medium and a program product.

[0029] The wireless communication device in this application is a device that transmits information based on an antenna. The source and acquisition process of the transmitted information are not specifically limited in this application. The wireless communication terminal in this application can be, for example, an environmental information collection device, a walkie-talkie, etc. The wireless communication device in this application can be a fixed indoor or outdoor device, or a handheld device.

[0030] Figure 1 is a schematic diagram of the internal circuit connection of the wireless communication terminal provided by the embodiment of the present application, such as Figure 1 As shown, the wireless communication device of the present application may include an antenna and a mainboard.

[0031] The antenna in the present application may be a helical antenna. The mainboard may include a proximity sensor (also referred to as a proximity detection sensor), a processing chip and a switch. In addition, the mainboard may include one or more inductors and one or more capacitors. The processing chip of the present application may be integrated with a central processing unit (CPU) and a modem (Modulator-Demodulator, Modem).

[0032] It should be further explained that one end of the proximity sensor is connected to the processing chip, and the other end of the proximity sensor is connected to one end of the antenna.

[0033] One end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna.

[0034] Figure 2 is a schematic diagram of the internal architecture of a wireless communication terminal provided in an embodiment of the present application, such as Figure 2As shown, based on the traditional helical antenna solution, the present application adds a connecting line to the helical antenna as port 2 connected to the mainboard, and the right wire end of the helical antenna is connected to the mainboard as port 1. Port 1 is the antenna feeding point, and port 2 is the antenna loading frequency modulation point, which is located in the middle of the antenna close to the feeding side.

[0035] According to the basic principle of antenna, the helical antenna has the maximum current and minimum voltage at the side close to the feed. When the loading capacitor or inductor device is grounded near the feed, the antenna frequency adjustment is relatively insensitive. The closer to the end of the antenna, the more sensitive the antenna loading frequency tuning is.

[0036] In actual use, the appropriate position is selected according to the antenna operating frequency, tuning range and corresponding applicable device range. For example, when loading near the end of the antenna, a very small variation range of the loading device is required, and the antenna resonant frequency will have a very large adjustment, which is not conducive to refining the antenna frequency tuning.

[0037] After selecting the appropriate loading tuning position, this application adds a switch at port2 to switch to different connection devices, such as Figure 1 As shown, antenna port 2 can be connected to a SPnT (Switch n-way Path) switch, and different capacitors or inductors are connected through the switch to switch the antenna resonant frequency. According to the antenna bandwidth and the required switching refinement, n is selected as a switch. The narrower the antenna bandwidth, the more likely it is that the antenna resonant frequency will deviate from the operating frequency range after being affected by the outside world, so more switching states are required. On the contrary, the wider the antenna bandwidth, even if the antenna resonant frequency is affected by the outside world, it is less likely to deviate from the operating frequency range, so fewer switch switching states are required.

[0038] In the present application, the capacitors that can be connected to the switch may include but are not limited to CS1, CS2, ..., CSm, etc., and the inductors that can be connected to the switch may include but are not limited to LS1, LS2, ..., LSm, etc.

[0039] After the two ends of the proximity sensor are connected to the antenna and the mainboard respectively, the antenna and the mainboard are equivalent to the two poles of the capacitor connected to the proximity detection sensor, so a certain frequency signal can be input into it for charging and discharging. At this time, the proximity sensor can detect the charging and discharging voltage and current waveform, thereby calculating the capacitance. Based on the capacitance at different times, the capacitance change can be determined, and the change in capacitance is the change in the equivalent dielectric constant of the object around the antenna.

[0040] The size of the capacitance is affected by the dielectric constant of the equivalent medium filled between the two poles. The capacitance between the antenna and the motherboard detected by the proximity sensor can be used to determine the equivalent dielectric constant of the objects around the antenna. In different application scenarios of wireless communication terminals, the different equivalent dielectric constants of objects close to the antenna are the main reason for the antenna frequency deviation.

[0041] The change in capacitance between the antenna and the motherboard detected by the proximity sensor can be used to determine whether an object is close to the antenna causing the antenna's resonant frequency to shift, as well as the approximate range of the shift.

[0042] Thus, the capacitance change between the antenna and the mainboard can be detected by the proximity sensor and transmitted to the processing chip as a detection result signal.

[0043] In this application, one end of the proximity sensor is connected to the antenna through L1, and the other end is connected to the mainboard ground (i.e., the mainboard is grounded). A certain frequency signal is input, and the capacitance between the antenna and the mainboard ground can be determined by identifying the charging and discharging voltage and current time curve of the frequency signal. The change in capacitance is the change in the equivalent dielectric constant of the objects around the antenna. When the antenna of the wireless communication terminal is in different application scenarios, the objects are close to different objects, and the surrounding equivalent dielectric constants are different, which in turn affects the size of the antenna resonant frequency offset.

[0044] When the antenna resonant frequency deviates from the operating frequency, the antenna performance is degraded, affecting the wireless communication performance. Therefore, the proximity sensor is used to detect the change in the equivalent dielectric constant around the antenna, and the approximate frequency offset of the antenna can be inferred. In actual operation, according to the possible application scenarios of the wireless communication terminal, its capacitance change and the antenna resonant frequency offset value are detected, and the capacitance change is divided into segments according to the switch switching path connected to port2. For example, the antenna port2 is connected to n path switches, that is, the capacitance change detected by the proximity sensor is divided into multiple ranges such as 0~CK1, CK1~...CK(n-1), and the corresponding test antenna offset resonant frequency values ​​f1...fn are used. The antenna is adjusted back to the target operating frequency through the designed antenna loading capacitance or inductance frequency shift characteristics.

[0045] In addition, the present application can pre-set a redundant space amount a between each threshold as a threshold, that is, when the detected capacitance change increases from less than CKx to CKx+a, it is determined that the switch state needs to be switched. On the contrary, when it decreases from greater than CKx to CKx-a, it is determined that the switch state needs to be switched, or when the capacitance change is greater than CKx+a or CKx-a and maintains for a certain time T0, it is determined that the switch state needs to be switched, so as to prevent frequent switching of the switch.

[0046] Furthermore, after receiving the capacitance change, if the processing chip determines that the capacitance change is greater than or equal to a preset threshold, or the capacitance change is greater than or equal to the preset threshold and maintains a time threshold, it determines that the switch state needs to be switched.

[0047] When it is determined that the switch state needs to be switched, the processing chip can match a switch state from multiple optional switch states according to a preset matching rule.

[0048] The preset matching rule includes a one-to-one correspondence relationship between at least one capacitance change and at least one switch state, as shown in the following Table 1: Table 1

[0049] Furthermore, after determining the switch state, the processing chip can control the switch to switch to the corresponding switch state, which can be specifically controlled to be connected to the other end of the first capacitor grounded, connected to the other end of the first inductor grounded, not connected to the other end of the first capacitor and the first inductor grounded, etc., thereby switching the switch connected to the antenna port2 to connect to different path capacitance or inductance values, and testing and verifying the capacitance change corresponding to the antenna resonant frequency offset value when the object approaches the antenna, and adjusting it back to the target operating frequency to ensure the antenna radiation and reception of electromagnetic waves. Performance, thereby ensuring the communication performance of the wireless communication terminal after the impact of the approaching object on the antenna resonant frequency in different application scenarios.

[0050] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a radio frequency circuit and a second inductor. The radio frequency circuit may include a radio frequency wireless transceiver connected in series with other radio frequency matching circuits.

[0051] Specifically, one end of the RF circuit is connected to the processing chip, and the other end is connected to one end of the antenna; one end of the second inductor (specifically, a large inductor filter L1) is connected to the proximity sensor, and the other end of the second inductor is connected to one end of the antenna port1.

[0052] By adding a large inductor filter L1 between the antenna and the proximity sensor, the influence of the proximity sensor path on the radio frequency circuit path can be eliminated, thereby improving the performance and communication quality of the wireless communication terminal.

[0053] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a second capacitor (specifically, an isolation capacitor C1 ) and a third inductor (specifically, a large inductor filter L2 ).

[0054] One end of the second capacitor is connected to the RF circuit, and the other end of the second capacitor is connected to port 1 of the antenna; one end of the third inductor is connected between the second capacitor and the RF circuit, and the other end of the third inductor is grounded.

[0055] In the present application, an isolation C1 is first connected between the antenna and the RF circuit path, and then a large inductor L2 is connected in parallel to the ground, so as to isolate the influence of the front-end RF circuit path on the proximity sensor. The signal detected by the proximity sensor passes through C1 and then directly passes through L2 to the ground, eliminating the influence of the back-end RF circuit path on the proximity sensor detection signal. At the same time, L2 adopts a large inductor and a high frequency to present an open circuit characteristic, eliminating the influence on the matching of the RF circuit path; C1 and the capacitance between the antenna and the motherboard are in a parallel relationship, and C1 is a fixed value. Therefore, the capacitance change between the antenna and the motherboard is detected by detecting the capacitance change. The antenna and the RF circuit path are connected to the RF matching circuit required by other antennas after passing through C1 and L1, and then connected to the RF wireless transceiver.

[0056] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a third capacitor (specifically, an isolation capacitor C2 ) and a fourth inductor (specifically, a large inductor filter L3 ).

[0057] One end of the third capacitor is connected to the switch, and the other end of the third capacitor is connected to the antenna; one end of the fourth inductor is connected between the third capacitor and the switch, and the other end of the fourth inductor is grounded.

[0058] In the present application, the antenna port2 path passes through an isolation C2 and is then connected in parallel to a large inductor L3 to be grounded, which can isolate the impact of the front-end RF circuit path on the proximity sensor. The proximity sensor detection signal passes through C2 and then directly passes through L3 to the ground, eliminating the impact of the back-end RF path on the proximity sensor detection signal. At the same time, L3 uses a large inductor and high frequency to present an open-circuit characteristic to eliminate the impact on the RF path matching.

[0059] Furthermore, it is connected to the SPnT (switch n-way path) switch input port, and the n output ports of the switch are respectively connected to capacitors or inductors LS1...LSm, CS1...CSm. Based on the original state of the antenna, LS1 is connected as an open circuit. When the switch is switched to connecting the inductor device, that is, the antenna loading device is an inductor, the antenna resonant frequency is biased towards high frequency. The smaller the inductance value, the higher the antenna resonant frequency.

[0060] When the switch is switched to connect the capacitor device, that is, the antenna loading device has a capacitor characteristic, the antenna resonant frequency is low frequency, and the larger the capacitance value, the lower the antenna resonant frequency. This is the basic principle of antenna loading tuning.

[0061] When the resonant frequency of the antenna in its original state is exactly at the operating frequency, any external object approaching will fill the surrounding environment of the antenna from the air into matter, increasing the spatial equivalent dielectric constant and making the antenna resonant frequency lower. At this time, an open circuit connection is required to connect the inductance. Different objects approaching have different inductances, but switches are all connected to inductance. When the resonant frequency of the antenna in its original state is lower or higher than the operating frequency, the switch will switch to different capacitance or inductance states due to the different materials of the objects approaching. Generally, in order to simplify the design, the resonant frequency of the antenna in its original state is selected to be exactly at the target operating frequency.

[0062] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard also includes a mainboard ground, and the proximity sensor is also connected to the mainboard ground.

[0063] Connect the proximity sensor to the motherboard ground. Since the ground can provide a stable reference potential for the sensor, the measurement accuracy of the capacitance change can be improved.

[0064] According to the wireless communication terminal of the embodiment of the present application, a proximity sensor and a switch are added to the mainboard of the wireless communication terminal, and one end of the proximity sensor is connected to the processing chip in the mainboard, the other end of the proximity sensor is connected to one end of the antenna in the wireless communication terminal, and one end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna; thus, the capacitance change between the antenna and the mainboard can be detected by the proximity sensor and transmitted to the processing chip, thereby identifying the impact of the wireless communication terminal on the antenna in different scenarios, and then the processing chip can match the switch state based on the capacitance change, and control the switch to be connected to the other end of the capacitor with one end grounded, to the other end of the inductor with one end grounded, or not connected to the other end of the capacitor and the inductor with one end grounded according to the switch state, so that the resonant frequency of the antenna can be adjusted back to the required frequency by loading the capacitor or inductor connected by the switch, so that the wireless communication terminal can meet the needs of various application scenarios and improve the versatility of the wireless communication terminal.

[0065] The frequency-adjustable antenna of the present application adopts a helical antenna solution. When the operating frequency of the wireless communication terminal is low, the helical antenna requires less space than other antenna solutions with the same performance, ensuring a smaller terminal size.

[0066] Based on the above wireless communication terminal, the present application also provides an antenna frequency adjustment method applied to the above wireless communication terminal.

[0067] Figure 3 is a flow chart of the antenna frequency adjustment method provided in the embodiment of the present application, such as Figure 3 As shown, the method includes: Step 110, determining the capacitance change between the antenna and the mainboard.

[0068] Step 120, matching the switch state based on the capacitance change.

[0069] Step 130: Perform switch control according to the switch state to adjust the resonant frequency of the antenna.

[0070] Further, matching the switch state based on the capacitance change includes: If the capacitance change is greater than or equal to a preset threshold, the switch state corresponding to the capacitance change is matched based on a preset matching rule; the preset matching rule includes a one-to-one corresponding association relationship between at least one capacitance change and at least one switch state.

[0071] Specifically, the wireless communication device in this application is a device that transmits information based on an antenna, and this application does not specifically limit the source and acquisition process of the transmitted information. The wireless communication terminal in this application can be, for example, an environmental information collection device, a walkie-talkie, etc. The wireless communication device in this application can be a fixed indoor or outdoor device, or a handheld device.

[0072] Figure 1 is a schematic diagram of the internal circuit connection of the wireless communication terminal provided by the embodiment of the present application, such as Figure 1 As shown, the wireless communication device of the present application may include an antenna and a mainboard.

[0073] The antenna in the present application may be a helical antenna. The mainboard may include a proximity sensor (also referred to as a proximity detection sensor), a processing chip and a switch. In addition, the mainboard may include one or more inductors and one or more capacitors. The processing chip of the present application may be integrated with a central processing unit (CPU) and a modem (Modulator-Demodulator, Modem).

[0074] It should be further explained that one end of the proximity sensor is connected to the processing chip, and the other end of the proximity sensor is connected to one end of the antenna.

[0075] One end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna.

[0076] Figure 2 is a schematic diagram of the internal architecture of a wireless communication terminal provided in an embodiment of the present application, such as Figure 2 As shown, based on the traditional helical antenna solution, the present application adds a connecting line to the helical antenna as port 2 connected to the mainboard, and the right wire end of the helical antenna is connected to the mainboard as port 1. Port 1 is the antenna feeding point, and port 2 is the antenna loading frequency modulation point, which is located in the middle of the antenna close to the feeding side.

[0077] According to the basic principle of antenna, the helical antenna has the maximum current and minimum voltage at the side close to the feed. When the loading capacitor or inductor device is grounded near the feed, the antenna frequency adjustment is relatively insensitive. The closer to the end of the antenna, the more sensitive the antenna loading frequency tuning is.

[0078] In actual use, the appropriate position is selected according to the antenna operating frequency, tuning range and corresponding applicable device range. For example, when loading near the end of the antenna, a very small variation range of the loading device is required, and the antenna resonant frequency will have a very large adjustment, which is not conducive to refining the antenna frequency tuning.

[0079] After selecting the appropriate loading tuning position, this application adds a switch at port2 to switch between different connection devices, such as Figure 1 As shown, antenna port 2 can be connected to a SPnT (Switch n-way Path) switch, and different capacitors or inductors are connected through the switch to switch the antenna resonant frequency. According to the antenna bandwidth and the required switching refinement, n is selected as a switch. The narrower the antenna bandwidth, the more likely it is that the antenna resonant frequency will deviate from the operating frequency range after being affected by the outside world, so more switching states are required. On the contrary, the wider the antenna bandwidth, even if the antenna resonant frequency is affected by the outside world, it is less likely to deviate from the operating frequency range, so fewer switch switching states are required.

[0080] In the present application, the capacitors that can be connected to the switch may include but are not limited to CS1, CS2, ..., CSm, etc., and the inductors that can be connected to the switch may include but are not limited to LS1, LS2, ..., LSm, etc.

[0081] After the two ends of the proximity sensor are connected to the antenna and the mainboard respectively, the antenna and the mainboard are equivalent to the two poles of the capacitor connected to the proximity detection sensor, so a certain frequency signal can be input into it for charging and discharging. At this time, the proximity sensor can detect the charging and discharging voltage and current waveform, thereby calculating the capacitance. Based on the capacitance at different times, the capacitance change can be determined, and the change in capacitance is the change in the equivalent dielectric constant of the object around the antenna.

[0082] The size of the capacitance is affected by the dielectric constant of the equivalent medium filled between the two poles. The capacitance between the antenna and the motherboard detected by the proximity sensor can be used to determine the equivalent dielectric constant of the objects around the antenna. In different application scenarios of wireless communication terminals, the different equivalent dielectric constants of objects close to the antenna are the main reason for the antenna frequency deviation.

[0083] The change in capacitance between the antenna and the motherboard detected by the proximity sensor can be used to determine whether an object is close to the antenna causing the antenna's resonant frequency to shift, as well as the approximate range of the shift.

[0084] Thus, the capacitance change between the antenna and the mainboard can be detected by the proximity sensor and transmitted to the processing chip as a detection result signal.

[0085] In this application, one end of the proximity sensor is connected to the antenna through L1, and the other end is connected to the mainboard ground (i.e., the mainboard is grounded). A certain frequency signal is input, and the capacitance between the antenna and the mainboard ground can be determined by identifying the charging and discharging voltage and current time curve of the frequency signal. The change in capacitance is the change in the equivalent dielectric constant of the objects around the antenna. When the antenna of the wireless communication terminal is in different application scenarios, the objects are close to different objects, and the surrounding equivalent dielectric constants are different, which in turn affects the size of the antenna resonant frequency offset.

[0086] When the antenna resonant frequency deviates from the operating frequency, the antenna performance is degraded, affecting the wireless communication performance. Therefore, the proximity sensor is used to detect the change in the equivalent dielectric constant around the antenna, and the approximate frequency offset of the antenna can be inferred. In actual operation, according to the possible application scenarios of the wireless communication terminal, its capacitance change and the antenna resonant frequency offset value are detected, and the capacitance change is divided into segments according to the switch switching path connected to port2. For example, the antenna port2 is connected to n path switches, that is, the capacitance change detected by the proximity sensor is divided into multiple ranges such as 0~CK1, CK1~...CK(n-1), and the corresponding test antenna offset resonant frequency values ​​f1...fn are used. The antenna is adjusted back to the target operating frequency through the designed antenna loading capacitance or inductance frequency shift characteristics.

[0087] In addition, the present application can pre-set a redundant space amount a between each threshold as a threshold, that is, when the detected capacitance change increases from less than CKx to CKx+a, it is determined that the switch state needs to be switched. On the contrary, when it decreases from greater than CKx to CKx-a, it is determined that the switch state needs to be switched, or when the capacitance change is greater than CKx+a or CKx-a and maintains for a certain time T0, it is determined that the switch state needs to be switched, so as to prevent frequent switching of the switch.

[0088] Furthermore, after receiving the capacitance change, if the processing chip determines that the capacitance change is greater than or equal to a preset threshold, or the capacitance change is greater than or equal to the preset threshold and maintains a time threshold, it determines that the switch state needs to be switched.

[0089] When it is determined that the switch state needs to be switched, the processing chip can match a switch state from multiple optional switch states according to a preset matching rule.

[0090] The preset matching rule includes a one-to-one correspondence relationship between at least one capacitance change and at least one switch state, as shown in the following Table 1: Table 1

[0091] Furthermore, after determining the switch state, the processing chip can control the switch to switch to the corresponding switch state, which can be specifically controlled to be connected to the other end of the first capacitor grounded, connected to the other end of the first inductor grounded, not connected to the other end of the first capacitor and the first inductor grounded, etc., thereby switching the switch connected to the antenna port2 to connect to different path capacitance or inductance values, and testing and verifying the capacitance change corresponding to the antenna resonant frequency offset value when the object approaches the antenna, and adjusting it back to the target operating frequency to ensure the antenna radiation and reception of electromagnetic waves. Performance, thereby ensuring the communication performance of the wireless communication terminal after the impact of the approaching object on the antenna resonant frequency in different application scenarios.

[0092] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a radio frequency circuit and a second inductor. The radio frequency circuit may include a radio frequency wireless transceiver connected in series with other radio frequency matching circuits.

[0093] Specifically, one end of the RF circuit is connected to the processing chip, and the other end is connected to one end of the antenna; one end of the second inductor (specifically, a large inductor filter L1) is connected to the proximity sensor, and the other end of the second inductor is connected to one end of the antenna port1.

[0094] By adding a large inductor filter L1 between the antenna and the proximity sensor, the influence of the proximity sensor path on the radio frequency circuit path can be eliminated, thereby improving the performance and communication quality of the wireless communication terminal.

[0095] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a second capacitor (specifically, an isolation capacitor C1 ) and a third inductor (specifically, a large inductor filter L2 ).

[0096] One end of the second capacitor is connected to the RF circuit, and the other end of the second capacitor is connected to port 1 of the antenna; one end of the third inductor is connected between the second capacitor and the RF circuit, and the other end of the third inductor is grounded.

[0097] In the present application, an isolation C1 is first connected between the antenna and the RF circuit path, and then a large inductor L2 is connected in parallel to the ground, so as to isolate the influence of the front-end RF circuit path on the proximity sensor. The signal detected by the proximity sensor passes through C1 and then directly passes through L2 to the ground, eliminating the influence of the back-end RF circuit path on the proximity sensor detection signal. At the same time, L2 adopts a large inductor and a high frequency to present an open circuit characteristic, eliminating the influence on the matching of the RF circuit path; C1 and the capacitance between the antenna and the motherboard are in a parallel relationship, and C1 is a fixed value. Therefore, the capacitance change between the antenna and the motherboard is detected by detecting the capacitance change. The antenna and the RF circuit path are connected to the RF matching circuit required by other antennas after passing through C1 and L1, and then connected to the RF wireless transceiver.

[0098] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard may further include a third capacitor (specifically, an isolation capacitor C2 ) and a fourth inductor (specifically, a large inductor filter L3 ).

[0099] One end of the third capacitor is connected to the switch, and the other end of the third capacitor is connected to the antenna; one end of the fourth inductor is connected between the third capacitor and the switch, and the other end of the fourth inductor is grounded.

[0100] In the present application, the antenna port2 path passes through an isolation C2 and is then connected in parallel to a large inductor L3 to be grounded, which can isolate the impact of the front-end RF circuit path on the proximity sensor. The proximity sensor detection signal passes through C2 and then directly passes through L3 to the ground, eliminating the impact of the back-end RF path on the proximity sensor detection signal. At the same time, L3 uses a large inductor and high frequency to present an open-circuit characteristic to eliminate the impact on the RF path matching.

[0101] Furthermore, it is connected to the SPnT (switch n-way path) switch input port, and the n output ports of the switch are respectively connected to capacitors or inductors LS1...LSm, CS1...CSm. Based on the original state of the antenna, LS1 is connected as an open circuit. When the switch is switched to connecting the inductor device, that is, the antenna loading device is an inductor, the antenna resonant frequency is biased towards high frequency. The smaller the inductance value, the higher the antenna resonant frequency.

[0102] When the switch is switched to connect the capacitor device, that is, the antenna loading device has a capacitor characteristic, the antenna resonant frequency is low frequency, and the larger the capacitance value, the lower the antenna resonant frequency. This is the basic principle of antenna loading tuning.

[0103] When the resonant frequency of the antenna in its original state is exactly at the operating frequency, any external object approaching will fill the surrounding environment of the antenna from the air into matter, increasing the spatial equivalent dielectric constant and making the antenna resonant frequency lower. At this time, an open circuit connection is required to connect the inductance. Different objects approaching have different inductances, but switches are all connected to inductance. When the resonant frequency of the antenna in its original state is lower or higher than the operating frequency, the switch will switch to different capacitance or inductance states due to the different materials of the objects approaching. Generally, in order to simplify the design, the resonant frequency of the antenna in its original state is selected to be exactly at the target operating frequency.

[0104] like Figure 1 As shown, in the wireless communication terminal of the present application, the mainboard also includes a mainboard ground, and the proximity sensor is also connected to the mainboard ground.

[0105] Connect the proximity sensor to the motherboard ground. Since the ground can provide a stable reference potential for the sensor, the measurement accuracy of the capacitance change can be improved.

[0106] According to the antenna frequency adjustment method of the embodiment of the present application, a proximity sensor and a switch are added to the mainboard of the wireless communication terminal, and one end of the proximity sensor is connected to the processing chip in the mainboard, the other end of the proximity sensor is connected to one end of the antenna in the wireless communication terminal, and one end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna; thus, the capacitance change between the antenna and the mainboard can be detected by the proximity sensor and transmitted to the processing chip, thereby identifying the impact of the wireless communication terminal on the antenna in different scenarios, and then the processing chip can match the switch state based on the capacitance change, and control the switch to be connected to the other end of the capacitor with one end grounded, to the other end of the inductor with one end grounded, or not connected to the other end of the capacitor and the inductor with one end grounded, according to the switch state, so that the resonant frequency of the antenna can be adjusted back to the desired frequency by loading the capacitor or inductor connected by the switch, so that the wireless communication terminal can meet the needs of various application scenarios and improve the versatility of the wireless communication terminal.

[0107] In a specific embodiment, the antenna scheme also adopts the above-mentioned adjustable frequency helical antenna scheme. The antenna port2 switch is connected to the SP4T (switching 4 paths) switch. The antenna's original state port2 switch is open. The number of spiral antenna coils, length and spiral diameter are adjusted to ensure that the antenna's original resonant frequency is at the target operating frequency. The antenna's original state resonant frequency and radiation efficiency are evaluated through software simulation. The simulation curve confirms that the antenna's original state resonant frequency is 750MHz (megahertz), which is the target operating frequency. The antenna radiation efficiency is -0.7dB (decibel). Through software simulation evaluation, it can be seen that when the terminal is placed on a wooden table, there is a comparison between the antenna's original state resonant frequency and radiation efficiency. When the terminal is placed on a wooden table, the antenna resonant frequency shifts to a low frequency of 55MHz to 695MHz. At the target operating frequency of 750MHz, the antenna radiation efficiency decreases by (-3.4)-(-0.7)=-2.7dB. In actual operation, the antenna offset resonant frequency value when the terminal is placed on a wooden table can be measured by an instrument, and the capacitance change CKx between the proximity sensor detection antenna and the motherboard can be recorded. According to the design, the adjustable frequency antenna load switch connects the capacitance or inductance value characteristics. The terminal processor controls the switch connection device to LSx / CSx according to the above judgment logic to adjust the antenna resonant frequency back to the target operating frequency of 750MH. z, in the example, the effect of loading the device is simulated by software. After the switch connected to the antenna port2 is switched to the connected inductor LSx of 20nH (nanohenry), the antenna resonance frequency and radiation efficiency comparison chart of the terminal placed on the wooden table after adjustment and before adjustment and in the original state is obtained through software simulation. The antenna resonance frequency is adjusted back to the target operating frequency of 750MHz. The adjusted antenna radiation efficiency is improved by (-1.2)-(-3.4)=2.2dB, which is similar to the original antenna radiation efficiency. The antenna performance is significantly improved, ensuring the communication effect of the wireless communication terminal. This example shows that the design of this application is reasonable and effective.

[0108] In another aspect, an embodiment of the present application further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the methods provided in the above embodiments, for example, including: determining the capacitance change between the antenna and the mainboard; matching a switch state based on the capacitance change; Switch control is performed according to the switch state to adjust the resonant frequency of the antenna.

[0109] In another aspect, an embodiment of the present application further provides a computer program product having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the methods provided in the above embodiments, for example, including: determining the capacitance change between the antenna and the mainboard; matching a switch state based on the capacitance change; Switch control is performed according to the switch state to adjust the resonant frequency of the antenna.

[0110] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0111] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0112] Finally, it should be noted that the above implementation modes are only used to illustrate the present application, rather than to limit the present application. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A wireless communication terminal, characterized in that: It includes an antenna and a mainboard; the mainboard includes a proximity sensor, a processing chip and a switch, and the mainboard also includes a first inductor and a first capacitor with one end grounded; one end of the proximity sensor is connected to the processing chip, and the other end of the proximity sensor is connected to one end of the antenna; one end of the switch is connected to the processing chip, and the other end of the switch is connected between the two ends of the antenna; The proximity sensor is used to detect the capacitance change between the antenna and the mainboard and transmit it to the processing chip; The processing chip is used to match the switch state based on the capacitance change, and control the switch to be connected to the other end of the first capacitor that is grounded, to be connected to the other end of the first inductor that is grounded, or to be disconnected from the other ends of both the first capacitor and the first inductor that are grounded according to the switch state; The mainboard also includes a radio frequency circuit and a second inductor; one end of the radio frequency circuit is connected to the processing chip, and the other end is connected to one end of the antenna; one end of the second inductor is connected to the proximity sensor, and the other end of the second inductor is connected to one end of the antenna.

2. The wireless communication terminal according to claim 1, characterized in that: The mainboard also includes a second capacitor and a third inductor; one end of the second capacitor is connected to the RF circuit, and the other end of the second capacitor is connected to the antenna; one end of the third inductor is connected between the second capacitor and the RF circuit, and the other end of the third inductor is grounded.

3. The wireless communication terminal according to claim 1, characterized in that: The mainboard also includes a third capacitor and a fourth inductor; one end of the third capacitor is connected to the switch, and the other end of the third capacitor is connected to the antenna; one end of the fourth inductor is connected between the third capacitor and the switch, and the other end of the fourth inductor is grounded.

4. The wireless communication terminal according to claim 1, characterized in that: The mainboard also includes a mainboard ground; the proximity sensor is also connected to the mainboard ground.

5. The wireless communication terminal according to claim 1, characterized in that: The antenna is a helical antenna.

6. An antenna frequency adjustment method for a wireless communication terminal according to any one of claims 1 to 5, characterized in that: include: Determine the capacitance change between the antenna and the motherboard; matching a switch state based on the capacitance change; Switch control is performed according to the switch state to adjust the resonant frequency of the antenna.

7. The antenna frequency adjustment method according to claim 6, characterized in that: The matching of the switch state based on the capacitance change comprises: If the capacitance change is greater than or equal to a preset threshold, the switch state corresponding to the capacitance change is matched based on a preset matching rule; the preset matching rule includes a one-to-one corresponding association relationship between at least one capacitance change and at least one switch state.

8. A storage medium, the storage medium being a non-transitory computer-readable storage medium, on which a computer program is stored, characterized in that: When the computer program is executed by a processor, the antenna frequency adjustment method as described in any one of claims 6 to 7 is implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the antenna frequency adjustment method as described in any one of claims 6 to 7 is implemented.

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