CN119363148A - Wireless communication terminal, antenna frequency adjustment method, storage medium and program product - Google Patents
Wireless communication terminal, antenna frequency adjustment method, storage medium and program product Download PDFInfo
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- CN119363148A CN119363148A CN202411899874.5A CN202411899874A CN119363148A CN 119363148 A CN119363148 A CN 119363148A CN 202411899874 A CN202411899874 A CN 202411899874A CN 119363148 A CN119363148 A CN 119363148A
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- 239000003990 capacitor Substances 0.000 claims abstract description 74
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- 238000004590 computer program Methods 0.000 claims description 12
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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Abstract
The application relates to the technical field of communication, and provides a wireless communication terminal, an antenna frequency adjusting method, a storage medium and a program product, wherein the terminal comprises an antenna and a main board; the mainboard comprises a proximity sensor, a processing chip, a switch, a first inductor and a first capacitor, wherein one end of the first inductor is grounded, one end of the proximity sensor is connected with the processing chip, the other end of the proximity sensor is connected with one end of an antenna, one end of the switch is connected with the processing chip, 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 controlling the switch to be connected with the grounded other end of the first capacitor, the grounded other end of the first inductor or not connected with the grounded other ends of the first capacitor and the first inductor according to the state of the switch based on the capacitance variation. The application ensures that the wireless communication terminal can meet the requirements of various application scenes and improves the universality of the wireless communication terminal.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a wireless communication terminal, an antenna frequency adjustment method, a storage medium, and a program product.
Background
In a wireless communication device, an antenna is an important transceiver, and its main function is to convert a guided wave propagating on a transmission line into an electromagnetic wave propagating in free space, or vice versa, and any wireless communication device needs an antenna composition, which plays an important role.
For example, the application scenario of the wireless communication terminal for environmental information collection is that environmental information data is collected in a forest or an indoor and outdoor environment, the environmental information data is returned to a server background through a wireless communication mode, when the forest fires, smoke and temperature information are collected, the information of the fire is timely returned to the server background to give an alarm, or smoke and temperature information data are collected indoors and returned, people can hold the wireless communication terminal for use as an outdoor sports emergency alarm terminal, and the like.
The traditional mode can only limit the use scene of the terminal, namely other objects can not be close around the antenna, or the bandwidth of the antenna is made wide enough as much as possible, so that when external objects such as trees or tables are close, the resonant frequency of the antenna is low, and the communication performance is ensured.
However, in order to ensure the communication performance of the antenna, the traditional scheme limits the application scene of the terminal, requires that no other objects around the antenna are close to each other, influences the universality of the terminal, and is inconvenient to use. The bandwidth requirement of the antenna is wide enough, so that when the frequency offset of the antenna is ensured, the bandwidth of the antenna can be expanded within the working frequency band, the terminal is generally required to be increased by a larger size, the convenience is influenced, the appearance is also not attractive, and the bandwidth of the antenna is difficult to be expanded within a certain range by increasing the size of the terminal to be enough to meet the requirement of application scenes. This results in insufficient versatility of the wireless communication terminal.
Disclosure of Invention
The present application is directed to solving at least one of the technical problems existing in the related art. Therefore, the application provides a wireless communication terminal, an antenna frequency adjusting method, a storage medium and a program product, which are used for improving the universality of the wireless communication terminal.
The wireless communication terminal comprises an antenna and a main board, wherein the main board comprises a proximity sensor, a processing chip and a switch, and the main board further comprises a first inductor and a first capacitor, one end of which is 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;
the proximity sensor is used for detecting the capacitance variation between the antenna and the main board and transmitting the capacitance variation to the processing chip;
The processing chip is used for matching a switch state based on the capacitance variation, and controlling the switch to be connected with the other end of the first capacitor grounded, the other end of the first inductor grounded or not connected with the first capacitor and the other end of the first inductor grounded according to the switch state.
According to one embodiment of the application, the main board further comprises a radio frequency circuit and a second inductor, one end of the radio frequency circuit is connected with the processing chip, the other end of the radio frequency circuit is connected with one end of the antenna, one end of the second inductor is connected with the proximity sensor, and the other end of the second inductor is connected with one end of the antenna.
According to one embodiment of the application, the main board further comprises a second capacitor and a third inductor, one end of the second capacitor is connected with the radio frequency circuit, the other end of the second capacitor is connected with the antenna, one end of the third inductor is connected between the second capacitor and the radio frequency circuit, and the other end of the third inductor is grounded.
According to one embodiment of the application, the main board further comprises a third capacitor and a fourth inductor, one end of the third capacitor is connected with the switch, the other end of the third capacitor is connected with 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.
According to one embodiment of the application, the main board further comprises a main board ground, and the proximity sensor is further connected with the main board ground.
According to one embodiment of the application, the antenna is a helical antenna.
According to a second aspect of the present application, an antenna frequency adjustment method applied to any one of the above wireless communication terminals includes:
Determining the capacitance variation between the antenna and the main board;
Matching a switch state based on the capacitance variation;
and performing switch control according to the switch state to adjust the resonant frequency of the antenna.
According to one embodiment of the present application, the matching the switch state based on the capacitance variation includes:
And if the capacitance variation is larger than or equal to a preset threshold value, matching the switch states corresponding to the capacitance variation based on a preset matching rule, wherein the preset matching rule comprises a one-to-one corresponding association relation between at least one capacitance variation and at least one switch state.
According to an embodiment of the third aspect of the present application, the storage medium is a non-transitory computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the antenna frequency adjustment method as described in any of the above.
A computer program product according to an embodiment of the fourth aspect of the application comprises a computer program which, when executed by a processor, implements a method of antenna frequency adjustment as described in any of the above.
The above technical solutions in the embodiments of the present application at least have the following technical effects:
The method comprises the steps that a proximity sensor and a switch are added in a main board of a wireless communication terminal, one end of the proximity sensor is connected with a processing chip in the main board, the other end of the proximity sensor is connected with one end of an antenna in the wireless communication terminal, 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; therefore, the influence of the wireless communication terminal on the antenna in different scenes can be identified by detecting the capacitance variation between the antenna and the main board through the proximity sensor and transmitting the capacitance variation to the processing chip, the processing chip can be matched with the switch state based on the capacitance variation, and the switch is controlled to be connected with the other end of the capacitor with one end grounded, the other end of the inductor with one end grounded or not connected with 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 through loading the capacitor or the inductor connected with the switch, the wireless communication terminal can meet the requirements of various application scenes, and the universality of the wireless communication terminal is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of internal circuit connection of a wireless communication terminal according to an embodiment of the present application.
Fig. 2is a schematic diagram of an internal architecture of a wireless communication terminal according to an embodiment of the present application.
Fig. 3 is a flowchart of an antenna frequency adjustment method according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the application but are not intended to limit the scope of the application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intermediate medium. The specific meaning of the above terms in embodiments of the present application will be understood in detail by those of ordinary skill in the art.
In embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The application provides a wireless communication terminal, an antenna frequency adjustment method, a storage medium and a program product.
The wireless communication device in the present application is a device for transmitting information based on an antenna, and the present application is not particularly limited to the source and the acquisition process of the transmitted information. The wireless communication terminal in the application can be, for example, environment information acquisition equipment, interphone and the like. The wireless communication device can be fixed on indoor or outdoor equipment or can be handheld equipment.
Fig. 1 is a schematic diagram of internal circuit connection of a wireless communication terminal according to an embodiment of the present application, where as shown in fig. 1, the wireless communication device of the present application may include an antenna and a motherboard.
The antenna in the application can be a spiral antenna. The motherboard may include a proximity sensor (also referred to as a proximity detection sensor), a processing chip, and a switch, and may include one or more inductors, and may include one or more capacitors. The processing chip of the present application may be integrated with a central processing unit (Central Processing Unit, CPU) and a Modem (Modem-Demodulator).
It should be noted 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.
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.
Fig. 2 is a schematic diagram of an internal architecture of a wireless communication terminal according to an embodiment of the present application, as shown in fig. 2, according to the present application, based on a conventional spiral antenna scheme, a connection line is added to a spiral antenna as port2 and connected to a motherboard, a right-hand end position connection line of the spiral antenna is as port1 and connected to the motherboard, port1 is an antenna feeding point, port2 is an antenna loading frequency modulation point, and the position is located in the middle of the antenna and is close to the feeding side.
According to the basic principle of the antenna, the current maximum point and the voltage minimum point of the spiral antenna are arranged on one side close to the feed, when a loading capacitor or an inductance device is additionally arranged near the feed and grounded, the antenna frequency adjustment is relatively insensitive, and the antenna loading frequency tuning is more sensitive when the antenna is closer to the tail end of the antenna.
In practical use, a proper position is selected according to the working frequency of the antenna, the tuning range and the corresponding applicable device range, for example, when the antenna is loaded near the tail end of the antenna, a small variation range of the loading device is needed, and the resonant frequency of the antenna can be greatly adjusted, so that the tuning of the antenna frequency is not beneficial to being thinned.
After selecting a proper loading tuning position, a switch is added at a port2 point to switch and select different connection devices, as shown in fig. 1, an SPnT (switching n paths) switch can be connected to the antenna port2, and different capacitors or inductors are connected through the switch to switch the resonant frequency of the antenna. According to the bandwidth of the antenna and the degree of switching refinement required, n is selected to be a plurality of switches, the narrower the bandwidth of the antenna, the more easily the operating frequency range is deviated after the antenna resonant frequency is deviated due to external influence, so that more switching states are required, otherwise, the wider the bandwidth of the antenna, the more easily the operating frequency range is deviated even after the antenna resonant frequency is deviated due to external influence, so that the less switching state requirements are required.
The capacitors to which the switch may be connected in the present application may include, but are not limited to, CS1, CS2, CSm, etc., and the inductors to which the switch may be connected may include, but are not limited to, LS1, LS2, LSm, etc.
According to the application, after the two ends of the proximity sensor are respectively connected to the antenna and the main board, the antenna and the main board are equivalent to the two pole pieces of the capacitor connected with the proximity detection sensor, so that a certain frequency signal can be input into the antenna and the main board to charge and discharge, and the proximity sensor can detect the charge and discharge voltage and current waveforms at the moment, so that the capacitance can be calculated. The capacitance change can be determined based on the capacitance in different time, and the capacitance change is the change of the equivalent dielectric constant of the object around the antenna.
The capacitance is influenced by the dielectric constant of the equivalent medium of the object filled between the two pole pieces. The equivalent dielectric constants of the objects around the antenna can be determined through the capacitance between the antenna and the main board detected by the proximity sensor, and the difference of the equivalent dielectric constants of the objects around the antenna is a main cause of the frequency offset of the antenna in different application scenes of the wireless communication terminal.
The capacitance change between the antenna and the main board detected by the proximity sensor can be used for judging whether an object approaches the antenna to cause the antenna resonant frequency to deviate and the approximate range of the deviation.
Thus, the capacitance change between the antenna and the motherboard can be detected by the proximity sensor and transmitted to the processing chip as a detection result signal.
According to the application, one end of the proximity sensor is connected to the antenna through L1, the other end of the proximity sensor is connected to the main board ground (namely the main board ground), a certain frequency signal is input, the capacitance between the antenna and the main board ground can be judged by identifying the charge-discharge voltage and current time curve of the frequency signal, the capacitance change is the change of the equivalent dielectric constant of objects around the antenna, the antenna approaches to the object when the wireless communication terminal is in different application scenes, the surrounding equivalent dielectric constants are different, and the magnitude of the resonant frequency offset of the antenna is affected.
When the antenna resonance frequency deviates from the working frequency, the antenna performance is reduced, and the wireless communication performance is affected, so that the change of the equivalent dielectric constant around the antenna is detected through the proximity sensor, the approximate frequency offset of the antenna can be deduced, the capacitance change and the antenna resonance frequency offset value are detected according to the possible application scene of the wireless communication terminal in actual operation, the capacitance change is divided into segments according to port2 connection switch switching paths, for example, the antenna port2 is connected with n path switches, namely, the detection capacitance change of the proximity sensor is divided into a plurality of interval ranges such as 0-CK1, CK1-DEG CK (n-1), and the like, the antenna is adjusted to the target working frequency through the designed antenna loading capacitance or inductance frequency shift characteristic.
In addition, the application can set a redundant space amount a between the thresholds in advance as a threshold, namely, when the detected capacitance change amount is increased from less than CKx to CKx+a, the need of switching state is judged. On the contrary, when CKx is larger than CKx and is reduced to CKx-a, the switching state is judged to be needed, or when the capacitance change amount is larger than CKx+a or CKx-a and is maintained for a certain time T0, the switching state is judged to be needed, so that the frequent switching of the switch is prevented.
Further, after the processing chip receives the capacitance variation, if it is determined that the capacitance variation is greater than or equal to a preset threshold, or the capacitance variation is greater than or equal to the preset threshold and is maintained for a time threshold, it is determined that the switching state needs to be switched.
When it is determined that switching of the switch states is required, the processing chip may match one switch state from a plurality of selectable switch states according to a preset matching rule.
The preset matching rule comprises an association relation between at least one capacitance variation and at least one switch state in a one-to-one correspondence mode. Specifically, the following table 1 shows:
TABLE 1
Further, after determining the switch state, the processing chip can control the switch to the corresponding switch state, specifically can control the connection with the other end grounded to the first capacitor, the connection with the other end grounded to the first inductor, the connection with the other ends grounded to the first capacitor and the first inductor, and the like, so that the switch connected with the switch antenna port2 is connected to different path capacitors or inductance values, the antenna resonant frequency offset value when the tested and verified capacitance variation corresponds to the object approaching the antenna is adjusted back to the target working frequency, the antenna radiation and electromagnetic wave receiving performance are ensured, and further the communication performance of the wireless communication terminal after the object approaching the antenna resonant frequency in different application scenes is ensured.
As shown in fig. 1, in the wireless communication terminal of the present application, the motherboard may further include a radio frequency circuit and a second inductor. The radio frequency circuit may include a radio frequency wireless transceiver in series with other radio frequency matching circuits.
Specifically, one end of the radio frequency circuit is connected with the processing chip, the other end of the radio frequency circuit is connected with one end of the antenna, one end of the second inductor (specifically, the large-inductance filter L1) is connected with the proximity sensor, and the other end of the second inductor is connected with one port1 of the antenna.
By adding a large inductance filter L1 between the antenna and the proximity sensor, the influence of the proximity sensor on the radio frequency circuit path can be eliminated, and the performance and communication quality of the wireless communication terminal are improved.
As shown in fig. 1, in the wireless communication terminal of the present application, the main board may further include a second capacitor (specifically, an isolation capacitor C1) and a third inductor (specifically, a large-inductance filter L2).
One end of the second capacitor is connected with the radio frequency circuit, the other end of the second capacitor is connected with port1 of the antenna, one end of the third inductor is connected between the second capacitor and the radio frequency circuit, and the other end of the third inductor is grounded.
According to the application, an isolation C1 is firstly connected between an antenna and a radio frequency circuit path, and then a large inductance L2 is connected in parallel, so that the influence of the front-end radio frequency circuit path on an approaching sensor can be isolated, a signal detected by the approaching sensor passes through the C1 and then directly passes through the L2 to the ground, the influence of the rear-end radio frequency circuit path on the detection signal of the approaching sensor is eliminated, meanwhile, the L2 adopts a large inductance high frequency to present an open circuit characteristic, the matching influence on the radio frequency circuit path is eliminated, the C1 and the antenna are in parallel connection, the C1 is a fixed value, and therefore, the capacitance variation is the capacitance variation between the antenna and the main board through detection, and the antenna and the radio frequency circuit path are connected to a radio frequency wireless transceiver after passing through the C1 and the L1 and then being connected with radio frequency matching circuits required by other antennas.
As shown in fig. 1, in the wireless communication terminal of the present application, the main board may further include a third capacitor (specifically, an isolation capacitor C2) and a fourth inductor (specifically, a large-inductance filter L3).
One end of the third capacitor is connected with the switch, the other end of the third capacitor is connected with 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.
According to the application, the antenna port2 passage is grounded through the isolation C2 and then connected with the large inductor L3 in parallel, so that the influence of the front-end radio frequency circuit passage on the proximity sensor can be isolated, the detection signal of the proximity sensor passes through the C2 and then directly passes through the L3 to the ground, the influence of the rear-end radio frequency passage on the detection signal of the proximity sensor is eliminated, and meanwhile, the L3 adopts the large inductor high-frequency to present an open circuit characteristic to eliminate the influence on the radio frequency passage matching.
Further, the switch is connected to an input port of an SPnT (switching n paths), n output ports of the switch are respectively connected to a capacitor or an inductor ls1..lsm, cs1..csm, and when the switch is switched to be connected with an inductor device according to an open circuit of the connection LS1 in an antenna original state, that is, the antenna loading device is of an inductance characteristic, the antenna resonant frequency is higher, and the antenna resonant frequency is higher when the inductance value is smaller.
When the switch is switched to be connected with the capacitor device, namely the antenna loading device has the capacitance characteristic, the antenna resonant frequency is lower, and the larger the capacitance value is, the lower the antenna resonant frequency is, which is the basic principle of antenna loading tuning.
When the resonance frequency of the antenna in the original state is exactly at the working frequency, the surrounding environment of the antenna is filled with substances from air by the approach of any external object, the space equivalent dielectric constant is increased, the resonance frequency of the antenna is low, the inductive character needs to be connected in an open circuit, the inductive characters are different by the approach of different objects, but the switch is the connecting inductance, when the resonance frequency of the antenna in the original state is low or higher than the working frequency, the material is different by the approach of the object, the switch switches different capacitance or inductance states, and the resonance frequency is just at the target working frequency in order to simplify the design of the antenna in the original state.
As shown in fig. 1, in the wireless communication terminal of the present application, the motherboard further includes a motherboard ground, and the proximity sensor is further connected to the motherboard ground.
The proximity sensor is grounded to the main board, and the grounding can provide a stable reference potential for the sensor, so that the accuracy of measuring the capacitance variation can be improved.
According to the wireless communication terminal provided by the embodiment of the application, the proximity sensor and the switch are added in the main board of the wireless communication terminal, one end of the proximity sensor is connected with the processing chip in the main board, the other end of the proximity sensor is connected with one end of the antenna in the wireless communication terminal, 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, so that the capacitance variation between the antenna and the main board can be detected through the proximity sensor and transmitted to the processing chip, the influence of the wireless communication terminal on the antenna in different scenes can be identified, the processing chip can be further matched with the switch state based on the capacitance variation, and the switch is controlled according to the switch state, and is connected with the other end of the capacitor with one end grounded or is not connected with the other end of the capacitor with one end grounded or the other end of the inductor grounded, so that the resonance frequency of the antenna can be adjusted back to the required frequency through loading the capacitor or the inductor connected with the switch, and the wireless communication terminal can meet the requirements of various application scenes, and the universality of the wireless communication terminal is improved.
The frequency-adjustable antenna adopts the spiral antenna scheme, so that the space occupied by the spiral antenna is smaller than that required by other antenna schemes under the condition of the same performance as the spiral antenna when the working frequency of the wireless communication terminal is lower, and the terminal size is ensured to be smaller and more exquisite.
Based on the wireless communication terminal, the application also provides an antenna frequency adjusting method applied to the wireless communication terminal.
Fig. 3 is a flow chart of an antenna frequency adjustment method according to an embodiment of the present application, where, as shown in fig. 3, the method includes:
Step 110, determining the capacitance variation between the antenna and the motherboard.
Step 120 matches the switch state based on the capacitance change amount.
Step 130, performing switch control according to the switch state to adjust the resonant frequency of the antenna.
Further, matching the switch state based on the capacitance variation amount includes:
And if the capacitance variation is greater than or equal to a preset threshold value, matching the switch states corresponding to the capacitance variation based on a preset matching rule, wherein the preset matching rule comprises a one-to-one association relationship between at least one capacitance variation and at least one switch state.
Specifically, the wireless communication device in the present application is a device for transmitting information based on an antenna, and the present application is not limited in particular to the source and the acquisition process of the transmitted information. The wireless communication terminal in the application can be, for example, environment information acquisition equipment, interphone and the like. The wireless communication device can be fixed on indoor or outdoor equipment or can be handheld equipment.
Fig. 1 is a schematic diagram of internal circuit connection of a wireless communication terminal according to an embodiment of the present application, where as shown in fig. 1, the wireless communication device of the present application may include an antenna and a motherboard.
The antenna in the application can be a spiral antenna. The motherboard may include a proximity sensor (also referred to as a proximity detection sensor), a processing chip, and a switch, and may include one or more inductors, and may include one or more capacitors. The processing chip of the present application may be integrated with a central processing unit (Central Processing Unit, CPU) and a Modem (Modem-Demodulator).
It should be noted 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.
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.
Fig. 2 is a schematic diagram of an internal architecture of a wireless communication terminal according to an embodiment of the present application, as shown in fig. 2, according to the present application, based on a conventional spiral antenna scheme, a connection line is added to a spiral antenna as port2 and connected to a motherboard, a right-hand end position connection line of the spiral antenna is as port1 and connected to the motherboard, port1 is an antenna feeding point, port2 is an antenna loading frequency modulation point, and the position is located in the middle of the antenna and is close to the feeding side.
According to the basic principle of the antenna, the current maximum point and the voltage minimum point of the spiral antenna are arranged on one side close to the feed, when a loading capacitor or an inductance device is additionally arranged near the feed and grounded, the antenna frequency adjustment is relatively insensitive, and the antenna loading frequency tuning is more sensitive when the antenna is closer to the tail end of the antenna.
In practical use, a proper position is selected according to the working frequency of the antenna, the tuning range and the corresponding applicable device range, for example, when the antenna is loaded near the tail end of the antenna, a small variation range of the loading device is needed, and the resonant frequency of the antenna can be greatly adjusted, so that the tuning of the antenna frequency is not beneficial to being thinned.
After selecting a proper loading tuning position, a switch is added at a port2 point to switch and select different connection devices, as shown in fig. 1, an SPnT (switching n paths) switch can be connected to the antenna port2, and different capacitors or inductors are connected through the switch to switch the resonant frequency of the antenna. According to the bandwidth of the antenna and the degree of switching refinement required, n is selected to be a plurality of switches, the narrower the bandwidth of the antenna, the more easily the operating frequency range is deviated after the antenna resonant frequency is deviated due to external influence, so that more switching states are required, otherwise, the wider the bandwidth of the antenna, the more easily the operating frequency range is deviated even after the antenna resonant frequency is deviated due to external influence, so that the less switching state requirements are required.
The capacitors to which the switch may be connected in the present application may include, but are not limited to, CS1, CS2, CSm, etc., and the inductors to which the switch may be connected may include, but are not limited to, LS1, LS2, LSm, etc.
According to the application, after the two ends of the proximity sensor are respectively connected to the antenna and the main board, the antenna and the main board are equivalent to the two pole pieces of the capacitor connected with the proximity detection sensor, so that a certain frequency signal can be input into the antenna and the main board to charge and discharge, and the proximity sensor can detect the charge and discharge voltage and current waveforms at the moment, so that the capacitance can be calculated. The capacitance change can be determined based on the capacitance in different time, and the capacitance change is the change of the equivalent dielectric constant of the object around the antenna.
The capacitance is influenced by the dielectric constant of the equivalent medium of the object filled between the two pole pieces. The equivalent dielectric constants of the objects around the antenna can be determined through the capacitance between the antenna and the main board detected by the proximity sensor, and the difference of the equivalent dielectric constants of the objects around the antenna is a main cause of the frequency offset of the antenna in different application scenes of the wireless communication terminal.
The capacitance change between the antenna and the main board detected by the proximity sensor can be used for judging whether an object approaches the antenna to cause the antenna resonant frequency to deviate and the approximate range of the deviation.
Thus, the capacitance change between the antenna and the motherboard can be detected by the proximity sensor and transmitted to the processing chip as a detection result signal.
According to the application, one end of the proximity sensor is connected to the antenna through L1, the other end of the proximity sensor is connected to the main board ground (namely the main board ground), a certain frequency signal is input, the capacitance between the antenna and the main board ground can be judged by identifying the charge-discharge voltage and current time curve of the frequency signal, the capacitance change is the change of the equivalent dielectric constant of objects around the antenna, the antenna approaches to the object when the wireless communication terminal is in different application scenes, the surrounding equivalent dielectric constants are different, and the magnitude of the resonant frequency offset of the antenna is affected.
When the antenna resonance frequency deviates from the working frequency, the antenna performance is reduced, and the wireless communication performance is affected, so that the change of the equivalent dielectric constant around the antenna is detected through the proximity sensor, the approximate frequency offset of the antenna can be deduced, the capacitance change and the antenna resonance frequency offset value are detected according to the possible application scene of the wireless communication terminal in actual operation, the capacitance change is divided into segments according to port2 connection switch switching paths, for example, the antenna port2 is connected with n path switches, namely, the detection capacitance change of the proximity sensor is divided into a plurality of interval ranges such as 0-CK1, CK1-DEG CK (n-1), and the like, the antenna is adjusted to the target working frequency through the designed antenna loading capacitance or inductance frequency shift characteristic.
In addition, the application can set a redundant space amount a between the thresholds in advance as a threshold, namely, when the detected capacitance change amount is increased from less than CKx to CKx+a, the need of switching state is judged. On the contrary, when CKx is larger than CKx and is reduced to CKx-a, the switching state is judged to be needed, or when the capacitance change amount is larger than CKx+a or CKx-a and is maintained for a certain time T0, the switching state is judged to be needed, so that the frequent switching of the switch is prevented.
Further, after the processing chip receives the capacitance variation, if it is determined that the capacitance variation is greater than or equal to a preset threshold, or the capacitance variation is greater than or equal to the preset threshold and is maintained for a time threshold, it is determined that the switching state needs to be switched.
When it is determined that switching of the switch states is required, the processing chip may match one switch state from a plurality of selectable switch states according to a preset matching rule.
The preset matching rule comprises an association relation between at least one capacitance variation and at least one switch state in a one-to-one correspondence mode. Specifically, the following table 1 shows:
TABLE 1
Further, after determining the switch state, the processing chip can control the switch to the corresponding switch state, specifically can control the connection with the other end grounded to the first capacitor, the connection with the other end grounded to the first inductor, the connection with the other ends grounded to the first capacitor and the first inductor, and the like, so that the switch connected with the switch antenna port2 is connected to different path capacitors or inductance values, the antenna resonant frequency offset value when the tested and verified capacitance variation corresponds to the object approaching the antenna is adjusted back to the target working frequency, the antenna radiation and electromagnetic wave receiving performance are ensured, and further the communication performance of the wireless communication terminal after the object approaching the antenna resonant frequency in different application scenes is ensured.
As shown in fig. 1, in the wireless communication terminal of the present application, the motherboard may further include a radio frequency circuit and a second inductor. The radio frequency circuit may include a radio frequency wireless transceiver in series with other radio frequency matching circuits.
Specifically, one end of the radio frequency circuit is connected with the processing chip, the other end of the radio frequency circuit is connected with one end of the antenna, one end of the second inductor (specifically, the large-inductance filter L1) is connected with the proximity sensor, and the other end of the second inductor is connected with one port1 of the antenna.
By adding a large inductance filter L1 between the antenna and the proximity sensor, the influence of the proximity sensor on the radio frequency circuit path can be eliminated, and the performance and communication quality of the wireless communication terminal are improved.
As shown in fig. 1, in the wireless communication terminal of the present application, the main board may further include a second capacitor (specifically, an isolation capacitor C1) and a third inductor (specifically, a large-inductance filter L2).
One end of the second capacitor is connected with the radio frequency circuit, the other end of the second capacitor is connected with port1 of the antenna, one end of the third inductor is connected between the second capacitor and the radio frequency circuit, and the other end of the third inductor is grounded.
According to the application, an isolation C1 is firstly connected between an antenna and a radio frequency circuit path, and then a large inductance L2 is connected in parallel, so that the influence of the front-end radio frequency circuit path on an approaching sensor can be isolated, a signal detected by the approaching sensor passes through the C1 and then directly passes through the L2 to the ground, the influence of the rear-end radio frequency circuit path on the detection signal of the approaching sensor is eliminated, meanwhile, the L2 adopts a large inductance high frequency to present an open circuit characteristic, the matching influence on the radio frequency circuit path is eliminated, the C1 and the antenna are in parallel connection, the C1 is a fixed value, and therefore, the capacitance variation is the capacitance variation between the antenna and the main board through detection, and the antenna and the radio frequency circuit path are connected to a radio frequency wireless transceiver after passing through the C1 and the L1 and then being connected with radio frequency matching circuits required by other antennas.
As shown in fig. 1, in the wireless communication terminal of the present application, the main board may further include a third capacitor (specifically, an isolation capacitor C2) and a fourth inductor (specifically, a large-inductance filter L3).
One end of the third capacitor is connected with the switch, the other end of the third capacitor is connected with 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.
According to the application, the antenna port2 passage is grounded through the isolation C2 and then connected with the large inductor L3 in parallel, so that the influence of the front-end radio frequency circuit passage on the proximity sensor can be isolated, the detection signal of the proximity sensor passes through the C2 and then directly passes through the L3 to the ground, the influence of the rear-end radio frequency passage on the detection signal of the proximity sensor is eliminated, and meanwhile, the L3 adopts the large inductor high-frequency to present an open circuit characteristic to eliminate the influence on the radio frequency passage matching.
Further, the switch is connected to an input port of an SPnT (switching n paths), n output ports of the switch are respectively connected to a capacitor or an inductor ls1..lsm, cs1..csm, and when the switch is switched to be connected with an inductor device according to an open circuit of the connection LS1 in an antenna original state, that is, the antenna loading device is of an inductance characteristic, the antenna resonant frequency is higher, and the antenna resonant frequency is higher when the inductance value is smaller.
When the switch is switched to be connected with the capacitor device, namely the antenna loading device has the capacitance characteristic, the antenna resonant frequency is lower, and the larger the capacitance value is, the lower the antenna resonant frequency is, which is the basic principle of antenna loading tuning.
When the resonance frequency of the antenna in the original state is exactly at the working frequency, the surrounding environment of the antenna is filled with substances from air by the approach of any external object, the space equivalent dielectric constant is increased, the resonance frequency of the antenna is low, the inductive character needs to be connected in an open circuit, the inductive characters are different by the approach of different objects, but the switch is the connecting inductance, when the resonance frequency of the antenna in the original state is low or higher than the working frequency, the material is different by the approach of the object, the switch switches different capacitance or inductance states, and the resonance frequency is just at the target working frequency in order to simplify the design of the antenna in the original state.
As shown in fig. 1, in the wireless communication terminal of the present application, the motherboard further includes a motherboard ground, and the proximity sensor is further connected to the motherboard ground.
The proximity sensor is grounded to the main board, and the grounding can provide a stable reference potential for the sensor, so that the accuracy of measuring the capacitance variation can be improved.
According to the antenna frequency adjustment method, the proximity sensor and the switch are added in the main board of the wireless communication terminal, one end of the proximity sensor is connected with the processing chip in the main board, the other end of the proximity sensor is connected with one end of the antenna in the wireless communication terminal, 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, so that the capacitance variation between the antenna and the main board can be detected through the proximity sensor and transmitted to the processing chip, the influence of the wireless communication terminal on the antenna in different scenes can be identified, the processing chip can be matched with the switch state based on the capacitance variation, and the switch is controlled to be connected with the other end of the capacitor with one end grounded or not connected with the other end of the capacitor or the other end of the inductor with one end grounded, so that the resonance frequency of the antenna can be adjusted back to the required frequency through loading the capacitor or the inductor connected with the switch, the wireless communication terminal can meet the requirements of various application scenes, and the universality of the wireless communication terminal is improved.
In a specific embodiment, the antenna scheme is also the tunable spiral antenna scheme, the antenna port2 switch is connected with the SP4T (4 paths are switched) switch, the antenna port2 switch is connected with the open circuit, the antenna original state resonance frequency is ensured to be on the target working frequency by adjusting the coil number, the length, the spiral diameter and the like of the spiral antenna, the antenna original state resonance frequency and the radiation efficiency are evaluated through software simulation, the antenna original state resonance frequency is confirmed to be 750MHz (megahertz) through a simulation curve, namely the target working frequency, the antenna radiation efficiency is-0.7 dB (decibel), and the software simulation evaluation shows that when the terminal is placed on a wood table, a comparison result exists between the antenna original state resonance frequency and the radiation efficiency. When the terminal is placed on a wood table, the resonant frequency of the antenna shifts from 55MHz to 695MHz to low frequency, at the target working frequency of 750MHz, the radiation efficiency of the antenna is reduced (-3.4) - (-0.7) = -2.7dB, the value of the resonant frequency of the antenna shifts when the terminal is placed on the wood table in actual operation can be measured through an instrument, the capacitance change CKx between the antenna and a main board is detected by a near sensor, the characteristic of the connection capacitance or inductance value of a switch is loaded according to the design tunable antenna, a terminal processor controls the connection device of the switch to LSx/CSx according to the judgment logic, the resonant frequency of the antenna is adjusted to the target working frequency of 750MHz, the effect of the loading device is simulated through software in an example, after the switch connected with the antenna port2 is switched to the connection inductance device LSx of 20nH (nanohenry), the resonant frequency and the radiation efficiency contrast diagram of the antenna in the original state before the terminal is adjusted through software simulation, the resonant frequency of the antenna is adjusted to the target working frequency of 750MHz, the radiation efficiency of the antenna after the adjustment is improved (-1.2) - (-3.4) = 2 dB), the radiation efficiency of the antenna after the adjustment is ensured to be close to the communication efficiency of the antenna in the original state, the antenna radiation efficiency is improved, and the communication efficiency of the antenna is obviously improved.
In yet another aspect, embodiments of the present application further provide a non-transitory computer readable storage medium having stored thereon a computer program that when executed by a processor is implemented to perform the method provided by the above embodiments, for example, comprising determining an amount of capacitance change between an antenna and a motherboard;
Matching a switch state based on the capacitance variation;
and performing switch control according to the switch state to adjust the resonant frequency of the antenna.
In yet another aspect, embodiments of the present application further provide a computer program product having a computer program stored thereon, which when executed by a processor is implemented to perform the method provided by the above embodiments, for example, comprising determining an amount of capacitance change between an antenna and a motherboard;
Matching a switch state based on the capacitance variation;
and performing switch control according to the switch state to adjust the resonant frequency of the antenna.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the related art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that the above-mentioned embodiments are merely illustrative of the application, and not limiting. Although the application has been described in detail with reference to the embodiments, those skilled in the art will understand that various combinations, modifications, or equivalent substitutions can be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (9)
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| US20130217342A1 (en) * | 2012-02-22 | 2013-08-22 | Motorola Mobility, Inc. | Antenna element as capacitive proximity/touch sensor for adaptive antenna performance improvement |
| CN107925160A (en) * | 2015-09-22 | 2018-04-17 | 华为技术有限公司 | The system and method for adaptive aperture adjustable antenna |
| CN115706573A (en) * | 2021-08-09 | 2023-02-17 | 中兴通讯股份有限公司 | Antenna control circuit, antenna control method, terminal device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130217342A1 (en) * | 2012-02-22 | 2013-08-22 | Motorola Mobility, Inc. | Antenna element as capacitive proximity/touch sensor for adaptive antenna performance improvement |
| CN104137331A (en) * | 2012-02-22 | 2014-11-05 | 摩托罗拉移动有限责任公司 | Antenna element as capacitive proximity/touch sensor for adaptive antenna performance improvement |
| CN107925160A (en) * | 2015-09-22 | 2018-04-17 | 华为技术有限公司 | The system and method for adaptive aperture adjustable antenna |
| CN115706573A (en) * | 2021-08-09 | 2023-02-17 | 中兴通讯股份有限公司 | Antenna control circuit, antenna control method, terminal device, and storage medium |
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