CN114866096B

CN114866096B - Antenna impedance tuning method and device, terminal equipment and storage medium

Info

Publication number: CN114866096B
Application number: CN202210402721.XA
Authority: CN
Inventors: 刘刚
Original assignee: Guangzhou Haige Communication Group Inc Co
Current assignee: Guangzhou Haige Communication Group Inc Co
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2023-09-01
Anticipated expiration: 2042-04-15
Also published as: CN114866096A

Abstract

The embodiment of the invention discloses an antenna impedance tuning method, an antenna impedance tuning device, terminal equipment and a storage medium, which are applied to the technical field of antenna impedance tuning and can solve the problem that how to realize automatic, rapid and accurate tuning of antenna impedance is needed to be solved at present. The method comprises the following steps: acquiring a signal to be transmitted and a target transmitting frequency of an antenna; determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value; tuning the impedance of the antenna according to the target tuning parameter; and transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance.

Description

Antenna impedance tuning method and device, terminal equipment and storage medium

Technical Field

The embodiment of the invention relates to the technical field of antenna impedance tuning, in particular to an antenna impedance tuning method, an antenna impedance tuning device, terminal equipment and a storage medium.

Background

Currently, with the development of communication technology, long-distance short-wave communication is increasingly applied. The long-distance short-wave radio station needs extremely high transmitting power, and as the input impedance of the antenna changes obviously along with the change of the surrounding environment, the impedance between the transmitter and the antenna becomes mismatched when the antenna impedance changes. The impedance mismatch between the antenna and the feeder line can lead part of the final output power of the transmitter sent by the feeder line to be reflected by the antenna, thus influencing the normal working state of the final power amplifier, possibly causing the final power amplifier to generate heat and even burn out, reducing the transmission efficiency of the system and having potential safety hazard. At present, the medium-long wave tuning technology is mostly analog motor tuning, but the medium-long wave communication performance is more limited due to large volume, complex tuning algorithm, slow tuning time, more non-tunable points and the like. Therefore, how to automatically, quickly and accurately tune the antenna impedance is a problem that needs to be solved.

Disclosure of Invention

The embodiment of the invention provides an antenna impedance tuning method, an antenna impedance tuning device, terminal equipment and a storage medium, which are used for solving the problem that how to realize automatic, rapid and accurate tuning of antenna impedance in the prior art is needed to be solved.

In a first aspect, there is provided an antenna impedance tuning method, an antenna being provided on an antenna impedance tuning apparatus, the method comprising: acquiring a signal to be transmitted and a target transmitting frequency of the antenna;

determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value;

tuning the impedance of the antenna according to the target tuning parameter;

and transmitting the signal to be transmitted according to the target transmitting frequency through the antenna with the tuned impedance.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, a plurality of capacitors and a plurality of inductors are provided in a tuning circuit, and tuning, according to the target tuning parameter, the impedance of the antenna includes:

according to the target capacitance value, controlling a first switch corresponding to each capacitor to enable at least one capacitor in the tuning circuit to work, wherein the total capacitance value of the tuning circuit is the target capacitance value;

Controlling a second switch corresponding to each inductor according to the target inductance value, so that at least one inductor in the tuning circuit works, and the total inductance value of the tuning circuit is the target inductance value;

the impedance of the antenna is tuned by the at least one capacitance and the at least one inductance.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the plurality of capacitors are connected in parallel, and each capacitor is connected in series with one of the first switches;

the plurality of inductors are connected in series, and each inductor is connected with one second switch in parallel.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, a power supply circuit is disposed in the antenna impedance tuning device, and the method further includes:

and supplying power to the first switch corresponding to each capacitor and the second switch corresponding to each inductor through the power supply circuit.

As an optional implementation manner, in a first aspect of the embodiment of the present invention, the tuning, according to the target tuning parameter, the impedance of the antenna includes:

determining a target matching network form according to the impedance of the antenna;

Determining a tuning circuit according to the target matching network form;

and tuning the impedance of the antenna through the tuning circuit according to the target capacitance value and the target inductance value.

As an optional implementation manner, in a first aspect of the embodiment of the present invention, the determining, according to an impedance of the antenna, a target matching network form includes:

acquiring a plurality of initial matching network forms;

determining an initial tuning network in each initial matching network form according to the target capacitance value and the target inductance value;

according to the network parameters of each initial tuning network, determining the target matching network form corresponding to the target tuning network;

the target tuning network is the tuning network with the highest network parameter in the initial tuning network.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, before the determining, according to the impedance of the antenna, a target matching network form, the method further includes:

synthesizing and transforming the sampling signals to obtain direct current signals;

outputting the direct current signal through the antenna, and receiving a reflected signal corresponding to the direct current signal;

Obtaining a reflection coefficient according to the direct current signal and the reflection signal;

and obtaining the impedance of the antenna according to the reflection coefficient.

setting the impedance of the antenna and a standard sampling resistor in series to obtain an impedance unit to be measured;

acquiring the total voltage of the impedance unit to be tested and the first voltage of the standard sampling resistor through a voltmeter;

and obtaining the impedance of the antenna according to the total voltage, the first voltage and the resistance value of the standard sampling resistor.

As an optional implementation manner, in a first aspect of the embodiment of the present invention, the determining a target tuning parameter according to the target transmission frequency includes:

and determining the target tuning parameter corresponding to the target transmitting frequency according to the target transmitting frequency and the corresponding relation between the pre-stored tuning parameter and the transmitting frequency of the antenna.

In a first aspect of the embodiment of the present invention, the transmitting, by tuning the antenna after impedance, the signal to be transmitted according to the target transmission frequency includes:

Detecting the standing-wave ratio of the tuning circuit by a standing-wave ratio detector;

and when the standing-wave ratio is detected to be in the range of the preset standing-wave ratio, transmitting the signal to be transmitted according to the target transmitting frequency through the antenna with the tuned impedance.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, a tuning switch and a sampling switch are provided in the antenna impedance tuning device, and before the tuning of the impedance of the antenna according to the target tuning parameter, the method further includes:

opening the sampling switch and closing the tuning switch;

the tuning switch is used for controlling antenna tuning, and the sampling switch is used for controlling impedance sampling of the antenna.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the obtaining a target transmission frequency of the antenna includes:

receiving radio frequency signals sent by a radio station;

and acquiring the target transmitting frequency from the radio frequency signal through a frequency detection circuit.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the method further includes:

detecting the temperature value of the antenna impedance tuning device in real time;

And when the temperature value reaches a temperature threshold value, outputting alarm information, wherein the alarm information is used for warning that the current temperature is too high.

In a second aspect, there is provided an antenna impedance tuning apparatus having an antenna provided thereon, the antenna impedance tuning apparatus comprising: the acquisition module is used for acquiring a signal to be transmitted and a target transmission frequency of the antenna;

the processing module is used for determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value;

the processing module is further used for tuning the impedance of the antenna according to the target tuning parameter;

and the receiving and transmitting module is used for transmitting the signal to be transmitted according to the target transmitting frequency through the antenna with the tuned impedance.

In a third aspect, there is provided a terminal device comprising:

a memory storing executable program code;

a processor coupled to the memory;

the processor invokes the executable program code stored in the memory to perform the antenna impedance tuning method in the first aspect of the embodiment of the present invention.

In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program that causes a computer to execute the antenna impedance tuning method in the first aspect of the embodiment of the present invention. The computer readable storage medium includes ROM/RAM, magnetic disk or optical disk, etc.

In a fifth aspect, there is provided a computer program product for causing a computer to carry out some or all of the steps of any one of the methods of the first aspect when the computer program product is run on the computer.

In a sixth aspect, an application publishing platform is provided for publishing a computer program product, wherein the computer program product, when run on a computer, causes the computer to perform part or all of the steps of any one of the methods of the first aspect.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, the antenna impedance tuning device can acquire the signal to be transmitted and the target transmitting frequency of the antenna; determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value; tuning the impedance of the antenna according to the target tuning parameter; and transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance. According to the scheme, the antenna impedance tuning device can automatically determine tuning parameters according to the transmitting frequency, so that the impedance is tuned, external signal transmitting equipment is not needed, the antenna impedance tuning device is provided with an antenna, full-band tuning can be realized according to the antenna impedance tuning device, the tuning range is enlarged, and the accuracy of impedance tuning is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an antenna impedance tuning device according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an antenna arrangement of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 4a is a schematic diagram of antenna radiation of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 4b is a schematic diagram of antenna radiation of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 4c is a schematic diagram of antenna radiation of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 5a is a schematic diagram of a matching network of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 5b is a schematic diagram of a matching network of an antenna impedance tuning method according to an embodiment of the present invention;

Fig. 5c is a schematic diagram of a matching network of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 6 is a second schematic flow chart of an antenna impedance tuning method according to an embodiment of the present invention;

FIG. 7 is a graphical illustration of standing wave ratio versus transmit frequency provided by an embodiment of the present invention;

FIG. 8a is a schematic circuit diagram of a capacitor bank according to an embodiment of the present invention;

fig. 8b is a schematic circuit diagram of an inductor assembly according to an embodiment of the present invention;

fig. 9a is a schematic diagram of a tuning circuit of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 9b is a schematic diagram of a tuning circuit of an antenna impedance tuning method according to an embodiment of the present invention;

FIG. 10a is a schematic diagram of a standing-wave ratio detection circuit according to an embodiment of the present invention;

FIG. 10b is a schematic diagram of a test scheme I of a standing-wave ratio detection circuit according to an embodiment of the present invention;

FIG. 10c is a schematic diagram II of a test scheme of a standing-wave ratio detection circuit according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a microprocessor according to an embodiment of the present invention;

fig. 12 is a flowchart of a method for tuning an antenna impedance according to an embodiment of the present invention;

FIG. 13a is a schematic diagram of a circuit schematic of a reflective bridge according to an embodiment of the present invention;

FIG. 13b is a schematic diagram of a sampling circuit according to an embodiment of the present invention;

fig. 14a is an impedance detection schematic diagram of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 14b is a voltage exploded view of an antenna impedance tuning method according to an embodiment of the present invention;

fig. 15 is a schematic diagram of a DDS signal source according to an embodiment of the present invention;

fig. 16 is a flowchart of a tuning method for antenna impedance according to an embodiment of the present invention;

fig. 17 is a schematic diagram of a frequency detection circuit according to an embodiment of the present invention;

fig. 18 is a schematic structural diagram of an antenna impedance tuning device according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms first and second and the like in the description and in the claims, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order of the objects. For example, a first switch and a second switch, etc. are used to distinguish between different switches, and are not used to describe a particular sequence of switches.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The execution main body of the antenna impedance tuning method provided by the embodiment of the invention can be the antenna impedance tuning device and the terminal equipment, or can be a functional module and/or a functional entity which can realize the antenna impedance tuning method in the antenna impedance tuning device and the terminal equipment, and the execution main body can be specifically determined according to actual use requirements. An antenna impedance tuning method according to an embodiment of the present invention will be described below by taking an antenna impedance tuning device as an example.

As shown in fig. 1, which is a schematic diagram of an antenna impedance tuning device according to an embodiment of the present invention, the antenna impedance tuning device may include: a radio frequency network unit 11, a detection unit 12 and a processor unit 13. The radio frequency network unit 11 may include an antenna 111, an adjustable inductance group 112, an adjustable capacitance group 113, a sampling switch 114, and a tuning switch 115; the detection unit 12 may include therein a standing wave ratio detector 121 and a phase detector 122; the processor unit 13 may include: microprocessor 131, signal source 132, controller 133, memory 134, and thermometer 135; the antenna impedance tuning device may interact with the station 14. The antenna impedance tuning device is explained specifically in the manner of the following embodiment.

Example 1

As shown in fig. 2, an embodiment of the present invention provides an antenna impedance tuning method, which may include the steps of:

201. and acquiring a signal to be transmitted and a target transmitting frequency of the antenna.

In the embodiment of the invention, the antenna impedance tuning device may be provided with an antenna, and the antenna may transmit a signal, and the antenna impedance tuning device may acquire a signal to be transmitted and a target transmitting frequency of the antenna, where the target transmitting frequency may be a frequency when the antenna transmits the signal to be transmitted outwards.

Alternatively, in an ideal situation, in order to ensure the radiation efficiency of the antenna when the radio station transmits signals, it is generally required that the effective length of the antenna can reach a quarter wavelength, and the frequency band wavelength used by the medium-long wave radio station is longer, for example, the wavelength is 1000m when the frequency is 300kHz, so that the effective length of the antenna needs to be more than 250 m. In order to facilitate the use, the antenna size cannot be oversized, different antenna lengths (50 m, 100m or 150m, currently, 150m monopole antennas are usually selected) can be selectively paved according to different requirements of communication distance or frequency, the antenna is horizontally paved on the ground, at the moment, the antenna has stronger directivity on a horizontal plane, and radiation along two axial ends is strongest, so when the 150m antenna is paved, the antenna is axially directed to the communication direction as much as possible, as shown in fig. 3, a three-dimensional coordinate system is established by taking the starting point O of the antenna 31 as a coordinate origin, the axial direction of the antenna is an X axis, the axial direction of the vertical antenna is a Y axis, and the vertical ground plane direction is a Z axis, namely, a plane XOY is the ground, and as the antenna is directly paved on the horizontal ground, the radiation energy of the antenna can be absorbed by the ground, and the lower the ground conductivity is, the absorption is stronger, so that the radiation efficiency of the antenna is reduced.

For example, as shown in fig. 4 a-4 c, antenna radiation diagrams corresponding to antennas with different frequencies are shown, and antenna gains corresponding to different patterns of depths are shown in the left area of each diagram, where the antenna gains can be used to represent the radiation field intensity of the antenna, and the deeper the pattern, the stronger the radiation. In fig. 4a, the antenna frequency is 200kHz, and the radiation of the antenna is spread outwards along the X-axis direction of the antenna axis from the antenna starting point O; in fig. 4b, the antenna frequency is 300kHz, and the radiation of the antenna is spread outwards along the X-axis direction of the antenna axis from the antenna starting point O; in fig. 4c, the antenna frequency is 400kHz, and the radiation of the antenna is spread outwards along the X-axis direction of the antenna axis from the antenna starting point O; by comparison, it can be seen that the higher the frequency the stronger the antenna radiation, i.e. the higher the antenna gain of the higher frequency antenna at the same location.

202. And determining a target tuning parameter according to the target transmitting frequency.

In the embodiment of the present invention, the antenna impedance tuning device may determine a target tuning parameter according to a target transmission frequency, where the target tuning parameter may include: a target capacitance value, and a target inductance value.

Optionally, according to the radiation result of the antenna, the antenna has a shorter effective length and is closer to the ground, so that the whole antenna has capacity, and an antenna network matching box needs to be set to perform corresponding matching tuning on the impedance of the antenna, thereby ensuring the maximum efficiency of the antenna. The maximum radiation direction of the antenna is the direction in which the antenna axis is pointing, so the specific positioning of the antenna needs to take into account the common communication direction of the antenna.

The characteristics of the load impedance can be classified into pure resistive, inductive and capacitive, and are simply referred to as resistive, inductive and capacitive, respectively. The relation between the current and the voltage of the pure resistive load accords with ohm law, namely the current is equal to the ratio between the voltage and the resistor; inductive and capacitive can refer to the phase relationship of voltage and current in a circuit, where the voltage phase leads the current and the current phase lags the voltage when the load is inductive in nature, i.e., the load is inductive; when the load is a capacitive load, the voltage phase lags the current phase leading the voltage, i.e. the load is capacitive.

It should be noted that, as shown in fig. 5a to 5c, in the related art, impedance tuning for an antenna is basically implemented using capacitance and inductance. As shown in fig. 5a, an inverted L-shaped matching network formed by C1 and L1 is used as a main tuning network, and the inverted L-shaped matching network may include a capacitor C1 and an inductor L1; as shown in fig. 5b, a tuning capacitor C2 is connected in series with the base of fig. 5a, so as to cancel the influence of stray inductance; as shown in fig. 5C, a tuning capacitor C3 is connected in parallel to the base of fig. 5b, so as to expand the matching capability of the network and transform the inverted L-shaped matching network into a pi-shaped network.

The capacitance value of each capacitor and the inductance value of each inductor can be adjusted, and the adjustment basis can be the impedance of the antenna, the transmitting frequency of the antenna and the like, so that the embodiment of the invention is not limited.

203. The impedance of the antenna is tuned according to the target tuning parameter.

In the embodiment of the invention, the antenna impedance tuning device can configure a tuning circuit according to the target tuning parameter and then tune the impedance of the antenna.

It should be noted that, since the input impedance of the antenna varies significantly with the surrounding environment, when the impedance of the antenna varies, the impedance between the transmitter and the antenna becomes mismatched. The impedance mismatch between the antenna and the feeder line can lead part of the final output power of the transmitter sent by the feeder line to be reflected by the antenna, thus influencing the normal working state of the final power amplifier, possibly causing the final power amplifier to generate heat and even burn out, reducing the transmission efficiency of the system and having potential safety hazard. The antenna impedance tuning device tunes the impedance of the antenna according to the target tuning parameter, namely to tune the antenna impedance and the radio output impedance, so that the antenna impedance and the radio output impedance can be matched.

204. And transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance.

In the embodiment of the invention, after the antenna is tuned by the antenna impedance tuning device, the impedance of the antenna and the output impedance of the radio station are already matched, and at the moment, the antenna with the tuned impedance can transmit a signal to be transmitted according to the target transmitting frequency.

The embodiment of the invention provides an antenna impedance tuning method, wherein an antenna impedance tuning device can acquire a signal to be transmitted and a target transmitting frequency of an antenna; determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value; tuning the impedance of the antenna according to the target tuning parameter; and transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance. According to the scheme, the antenna impedance tuning device can automatically determine tuning parameters according to the transmitting frequency, so that the impedance is tuned, external signal transmitting equipment is not needed, the antenna impedance tuning device is provided with an antenna, full-band tuning can be realized according to the antenna impedance tuning device, the tuning range is enlarged, and the accuracy of impedance tuning is improved.

Example two

As shown in fig. 6, an embodiment of the present invention provides an antenna impedance tuning method, which may further include the following steps:

601. and acquiring a signal to be transmitted and a target transmitting frequency of the antenna.

602. And determining the target tuning parameter corresponding to the target transmitting frequency according to the target transmitting frequency and the corresponding relation between the pre-stored tuning parameter and the transmitting frequency of the antenna.

In the embodiment of the present invention, the antenna impedance tuning device may perform analog tuning on the antenna in advance, so as to obtain a correspondence between the tuning parameter and the antenna frequency, and store the correspondence in the memory 134 in fig. 1, so that the antenna impedance tuning device may determine, after obtaining the target transmission frequency, the target tuning parameter corresponding to the target transmission frequency in the correspondence between the pre-stored tuning parameter and the transmission frequency of the antenna.

It should be noted that, when tuning parameters of the tuning circuit are adjusted, the capacitance is a fixed capacitance value, and the inductance is a part of inductance value that can be adjusted to work in the tuning circuit.

For example, table 1 below shows the correspondence between the transmit frequency of the antenna and the target capacitance and inductance values in the target tuning parameters, only some of which are listed here for reference.

Table 1 correspondence table of transmitting frequency, target inductance value and target capacitance value of antenna

Transmitting frequency/kHz of antenna	Target inductance value/uH	Target capacitance/pF
			375	16.4	1500
330	59.3	1500
			295	104.6	1500
268	151	1500
			240	161	7000
228	263.5	7000
			213	317	7000
204	362	7000

After tuning the data, matching between the antenna impedance and the output impedance of the radio station can be achieved, that is, the standing wave ratio of the antenna can be kept within a standard range, as shown in fig. 7, which is a graph diagram between the standing wave ratio of the antenna and the transmitting frequency of the antenna, a coordinate system is established by taking the transmitting frequency of the antenna as an abscissa and the standing wave ratio of the antenna as an ordinate, the standing wave ratio obtained after tuning the antenna impedance according to the target tuning parameter is correspondingly drawn in the coordinate system with the transmitting frequency of the antenna, and is connected to form a curve 71, so that the change trend of the standing wave ratio when the capacitance and the inductance change can be seen, wherein a dotted line 72 is a preset standing wave ratio threshold value, and the different inductance values and capacitance values basically ensure that the standing wave ratio of the whole frequency band is less than or equal to 2.5 and is greater than or equal to 1.

603. And controlling the first switch corresponding to each capacitor according to the target capacitance value, so that at least one capacitor in the tuning circuit works, and the total capacitance value of the tuning circuit is the target capacitance value.

In the embodiment of the invention, when the antenna impedance tuning device configures the capacitor in the tuning circuit according to the target capacitance value, the total capacitance value in the tuning circuit needs to be ensured to be the target capacitance value, and at least one capacitor needs to exist in the tuning circuit to work.

Alternatively, a capacitor bank, i.e. the tunable capacitor bank 113 in fig. 1, may be provided in the tuning circuit, in which a plurality of capacitors of different capacitance values may be included, the capacitors being in parallel relationship and each capacitor being connected in series with a first switch, as shown in fig. 8a, which is a schematic circuit diagram of the capacitor bank, in which C ₁ 、C ₂ 、C ₃ 、C _n In parallel relationship with each other, and C ₁ And S is ₁ Series connection of C ₂ And S is ₂ Series connection of C ₃ And S is ₃ Series connection of C _n And S is _n And (3) connecting in series.

Wherein, when the firstWhen the switch is in a closed state, the corresponding capacitor starts to work, namely the capacitor is connected into the tuning circuit; when the first switch is in an off state, the corresponding capacitor stops working, namely the capacitor is not connected to the tuning circuit; exemplary, when S1 is closed, C as shown in FIG. 8a ₁ I.e. the connected circuit starts to work; when S1 is disconnected, C ₁ The non-connected circuit pauses operation.

It should be noted that the equivalent capacitance of the plurality of parallel capacitors is larger than that of any one of the capacitors, the voltages between the two plates of the plurality of parallel capacitors are the same, the total electric quantity of the plurality of parallel capacitors is the sum of the electric quantities of the capacitors, i.e. the equivalent capacitance of the plurality of parallel capacitors is equal to the sum of the electric quantities of the capacitors, i.e. c=c ₁ +C ₂ +C ₃ +…+C _n Wherein C ₁ 、C ₂ 、C ₃ 、C _n The capacitance value of each capacitor is C, which is the total capacitance value of a plurality of capacitors connected in parallel, so that the antenna impedance tuning device can calculate the plurality of capacitors after acquiring the target capacitance value, and the first switch corresponding to the capacitor with the sum of the capacitance values being the target capacitance value is closed, so that the capacitors start to work.

It should be noted that the equivalent capacitance of the plurality of capacitors in series is smaller than that of any one capacitor, the charged amounts of the plurality of capacitors in series are equal, namely the total electric quantity Q of the capacitor bank, the total voltage of the plurality of capacitors in series is equal to the sum of the voltages of the capacitors, namely the reciprocal of the equivalent capacitance of the plurality of capacitors in series is equal to the sum of the reciprocal of the capacitance of the capacitors, namelyWherein C is ₁ 、C ₂ 、C ₃ 、C _n The capacitance value of each capacitor is respectively, and C is the total capacitance value of a plurality of capacitors connected in series.

Optionally, a power supply circuit is further provided in the antenna impedance tuning device, and the antenna impedance tuning device can supply power to the first switch corresponding to each capacitor through the power supply circuit.

604. And controlling a second switch corresponding to each inductor according to the target inductance value, so that at least one inductor in the tuning circuit works, and the total inductance value of the tuning circuit is the target inductance value.

In the embodiment of the invention, when the antenna impedance tuning device configures the inductor in the tuning circuit according to the target inductance value, the total inductance value in the tuning circuit needs to be ensured to be the target inductance value, and at least one inductor needs to exist in the tuning circuit to work.

Alternatively, an inductor group, i.e., the tunable inductor group 112 of fig. 1, may be disposed in the tuning circuit, and may include a plurality of inductors of different inductance values in series relationship with each other, and each of the inductors may be connected in parallel with a second switch, as shown in fig. 8b, which is a schematic circuit diagram of the inductor group, where L is ₁ 、L ₂ 、L ₃ 、L _n In a series relationship with each other, and L ₁ And S is ₁ Parallel connection, L ₂ And S is ₂ Parallel connection, L ₃ And S is ₃ Parallel connection, L _n And S is _n And are connected in parallel.

When the second switch is in an off state, the corresponding inductor starts to work, namely the inductor is connected to the tuning circuit; when the second switch is in a closed state, the corresponding inductor stops working, namely the inductor is not connected into the tuning circuit; exemplary, as shown in FIG. 8b, when S1 is off, L ₁ I.e. the connected circuit starts to work; when S1 is closed, L ₁ The non-connected circuit pauses operation.

It should be noted that the equivalent inductance value of the plurality of series-connected inductors is larger than that of any one of the plurality of series-connected inductors, and the equivalent inductance value of the plurality of series-connected inductors is equal to the sum of the inductance values of the respective inductors, i.e., l=l ₁ +L ₂ +L ₃ +…+L _n Wherein L is ₁ 、L ₂ 、L ₃ 、L _n The inductance value of each inductor is L is the total inductance value of a plurality of series-connected inductors, so the antenna impedance tuning device can calculate the plurality of inductors after obtaining the target inductance value, and the sum of the inductance values is the second switch corresponding to the inductance of the target inductance valueAnd then the inductors are started to work.

It should be noted that the equivalent inductance value of the plurality of parallel inductors is smaller than that of any one of the plurality of parallel inductors, and the reciprocal of the equivalent inductance value of the plurality of parallel inductors is equal to the sum of the reciprocal of each of the plurality of parallel inductors, that isWherein L is ₁ 、L ₂ 、L ₃ 、L _n The inductance value of each inductor is respectively, and L is the total inductance value of a plurality of parallel inductors.

Optionally, a power supply circuit is further provided in the antenna impedance tuning device, and the antenna impedance tuning device can supply power to the second switch corresponding to each inductor through the power supply circuit.

As an alternative implementation manner, the antenna impedance tuning device may at least be implemented by the following two ways when configuring the capacitance and the inductance in the tuning circuit according to the target capacitance value and the target inductance value:

mode one: the tuning mode is customized.

As shown in fig. 9a, the antenna impedance tuning device can control 8 vacuum relays to complete the control of the circuit through the controller 133 in fig. 1, wherein K1-K7 are used for adjusting the inductance coil; k8 is used for the adjustment of the capacitance, mainly switching between 1500pF and 7000pF, 1500pF for the high frequency band and 7000pF for the low frequency band.

In fig. 9a, there are a number of different ways of closing K1-K7, each of which causes a different inductor to operate, thereby adjusting the inductance in the tuning circuit.

Mode two: vector tuning mode.

As shown in fig. 9b, the antenna impedance tuning device changes the fixed value inductance and capacitance into a binary inductance and capacitance scheme based on the custom tuning mode, namely 8 inductances are connected in series, each inductance is connected in parallel with a vacuum relay, 256-level stepping of the inductance can be realized, and the inductance stepping is as shown in the following table 2:

table 2 inductive gear correspondence table

S1

S2

S3

S4

S5

S6

S7

S8

1.5uH

3uH

6uH

12uH

24uH

48uH

96uH

192uH

The antenna impedance tuning device can adjust the inductance value in the tuning circuit by adjusting the closing and opening of each vacuum relay.

605. The impedance of the antenna is tuned by at least one capacitance and at least one inductance.

In the embodiment of the invention, after the antenna impedance tuning device configures the capacitor and the inductor according to the target capacitance value and the target inductance value, at least one capacitor and at least one inductor can exist in the tuning circuit to work, and at this time, the antenna impedance tuning device can tune the impedance of the antenna through the at least one capacitor and the at least one inductor.

606. And detecting the standing-wave ratio of the tuning circuit by a standing-wave ratio detector.

In the embodiment of the invention, the antenna impedance tuning device can detect the standing wave ratio of the tuning circuit when the impedance of the antenna is tuned.

It should be noted that, the standing wave ratio (Voltage Standing Wave Ratio, VSWR) refers to the ratio of the antinode voltage to the amplitude of the trough voltage, which is also called standing wave coefficient. When the standing-wave ratio is equal to 1, the impedance of the feeder line and the antenna is completely matched, and at the moment, all high-frequency energy is radiated by the antenna without energy reflection loss; and when the standing wave ratio is infinity, total reflection is indicated, and energy is not radiated.

The standing-wave ratio may be detected by the standing-wave ratio detector 121 and the phase detector 122 in fig. 1, which may monitor the working state of the matching network, and provide the monitoring result to the microprocessor 131 in fig. 1 for processing, as shown in fig. 10a, which is a schematic diagram of a standing-wave ratio detection circuit of the standing-wave ratio detector.

Alternatively, detecting the standing-wave ratio using the standing-wave ratio detector may include two test schemes, one of which is a direct coupling test scheme, as shown in fig. 10b, but in which the loss on the T5 sub-coil is about 200W, which is prone to damage due to overheating of the magnetic ring; and a weak coupling test scheme is adopted, as shown in fig. 10c, the radio frequency copper rod 10c1 and the magnetic rod 10c2 are at a proper distance, and the coupling coefficient is adjusted, so that proper forward and reverse power is finally obtained.

Alternatively, the antenna impedance tuning device may employ the microprocessor 131 in fig. 1 for numerical processing, measurement matching control, and the like. Because the output measurement data flow is large in the measurement process, a large amount of digital filtering and data processing are needed to be carried out, so that the accurate measurement antenna impedance is calculated, meanwhile, an antenna matching system is needed to switch a corresponding matching capacitor and an inductance network by using an I/O relay according to the measured antenna impedance data, so that the antenna is matched with the output impedance of a transmitter after passing through the matching network, a large amount of general microprocessor functions such as judgment and process statement are needed in the process, the receiving and transmitting of communication signals of a short-wave radio station are also completed by a microprocessor, and the schematic diagram of the microprocessor is shown in fig. 11.

607. And when the standing-wave ratio is detected to be in the range of the preset standing-wave ratio, transmitting a signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance.

In the embodiment of the invention, if the antenna impedance tuning device detects that the current standing-wave ratio is in the preset standing-wave ratio range, which means that the antenna impedance and the radio station output impedance are matched, the antenna impedance tuning device can transmit the signal to be transmitted according to the target transmitting frequency through the antenna after the impedance tuning.

Furthermore, the antenna impedance tuning device can pre-store the corresponding relation between the transmitting frequency and the tuning parameter, so that the antenna impedance tuning device can directly determine the tuning parameter corresponding to the current frequency, and the tuning speed is further improved; each inductor and each capacitor are controlled through a plurality of switches respectively, so that the combination mode of the capacitors and the inductors can be enriched, and the tuning range can be enlarged; and the standing wave ratio is detected in real time during tuning, so that the tuning result can be ensured, and the accuracy of impedance tuning is improved.

Example III

As shown in fig. 12, an embodiment of the present invention provides an antenna impedance tuning method, which may further include the following steps:

1201. and acquiring a signal to be transmitted and a target transmitting frequency of the antenna.

1202. And determining a target tuning parameter according to the target transmitting frequency.

1203. And determining the target matching network form according to the impedance of the antenna.

In the embodiment of the invention, the antenna impedance tuning device also needs to determine the form of the matching network before tuning the impedance of the antenna, and the antenna impedance tuning device can determine the form of the target matching network according to the impedance of the antenna.

It should be noted that, the matching network has a plurality of forms, including a f-type network, a T-type network, a pi-type network, a multi-stage network, a filter principle matching network, and the like; each network form is composed of a different capacitance and inductance.

Optionally, determining the target matching network form according to the impedance of the antenna may specifically include: acquiring a plurality of initial matching network forms; determining an initial tuning network in each initial matching network form according to the target capacitance value and the target inductance value; and determining a target matching network form corresponding to the target tuning network according to the network parameters of each initial tuning network.

The target tuning network is the tuning network with the highest network parameters in the initial tuning network.

In this implementation manner, the antenna impedance tuning device may determine an initial tuning network corresponding to each initial matching network form, and then compare network parameters of each initial tuning network, so as to obtain a target matching network form corresponding to the target tuning network.

It should be noted that, the network parameters of the initial tuning network may include a standing wave ratio of the tuning network, the number of elements of the tuning network, a tuning speed of the tuning network, and the like; wherein, the lower the standing wave ratio of the tuning network is, the fewer the number of elements of the tuning network is, the faster the tuning speed of the tuning network is, and the higher the network parameters are.

By way of example, assuming that the initial matching network forms determined by the antenna impedance tuning device include a f-type network, a T-type network, and a pi-type network, then, each initial matching network form is configured with a capacitor and an inductor, three initial tuning networks can be obtained, at this time, network parameters of the three initial tuning networks are detected and compared, and then, a tuning network with the highest network parameter is selected as the target tuning network.

Optionally, before determining the target matching network form according to the impedance of the antenna, the impedance of the antenna needs to be determined, where the manner of determining the impedance of the antenna may specifically include, but is not limited to, the following optional implementation manners:

the implementation mode is as follows: synthesizing and transforming the sampling signals to obtain direct current signals; outputting a direct current signal through an antenna, and receiving a reflected signal corresponding to the direct current signal; obtaining a reflection coefficient according to the direct current signal and the reflection signal; and obtaining the impedance of the antenna according to the reflection coefficient.

In this implementation manner, the antenna impedance tuning device may use a reflective bridge as a directional coupler, and the antenna impedance to be measured is used as one arm of the reflective bridge, and the sampling signal is first synthesized into a dc signal; and then obtaining a reflection signal corresponding to the direct current signal, so as to calculate a reflection coefficient and further obtain antenna impedance, wherein a circuit principle schematic diagram of the reflection bridge is shown in fig. 13 a.

It should be noted that, the antenna impedance tuning device may determine the forward power of the direct current signal and the reverse power of the reflected signal through the power meter, and then obtain the reflection coefficient according to the forward power and the reverse power, In addition, a certain corresponding relation exists between the reflection coefficient and the antenna impedance, and the larger the reflection coefficient is, the antenna impedance and the 50 omega are described as the real part standard value of the impedance is 50 omegaThe greater the difference between them; the smaller the reflection coefficient, the smaller the difference between the antenna impedance and 50Ω.

Alternatively, the combination transformation of the antenna impedance tuning device to the sampling signal may also be referred to as balance-to-unbalance transformation, i.e. converting two paths of signals into one path of signals, where a sampling circuit is required to obtain the two paths of sampling signals, as shown in fig. 13b, which is a schematic diagram of the sampling circuit, and further it is required to remove errors of the system, such as line loss, signal leakage, etc., according to an error theory.

Optionally, during sampling, the sampling switch needs to be closed in advance, and the tuning switch needs to be opened. As shown in fig. 1, a sampling switch 114 and a tuning switch 115 are provided in a radio frequency network unit of the antenna impedance tuning device, and when the antenna impedance tuning device needs to sample a signal and measure the antenna impedance, the sampling switch 114 is closed, and the tuning switch 115 is opened; when the antenna impedance tuning device needs to tune the impedance of the antenna, the tuning switch 115 is closed, and the sampling switch 114 is opened.

The implementation mode II is as follows: setting the impedance of the antenna and a standard sampling resistor in series to obtain an impedance unit to be measured; acquiring the total voltage of an impedance unit to be measured and the first voltage of a standard sampling resistor through a voltmeter; and obtaining the impedance of the antenna according to the total voltage, the first voltage and the resistance value of the standard sampling resistor.

In this implementation, the antenna impedance tuning device may calculate the impedance of the antenna using vector voltammetry, i.e. by measuring the voltage applied across the impedance unit to be measured U and the voltage across a standard sampling resistor in series with the impedance of the antenna. As shown in fig. 14a, the antenna impedance Z _DUT And standard sampling resistor R _s The series arrangement, the voltmeter can obtain the impedance unit to be measured, namely the antenna impedance Z _DUT And standard sampling resistor R _s Is set to the total voltage U of the resistor R _s Is set at the first voltage U _s 。

The scheme adopts a free axis method digital vector impedance measurement technology based on a vector volt-ampere method, and a phase detection reference standard of the free axis method can be adoptedOptionally, only two coordinate axes need to be kept orthogonal. In practical design, quadrature signal (I/Q signal) synchronous detection is adopted to measure the I/Q components of the measured parameters respectively, and directly calculate the real part and imaginary part of the measured impedance, as shown in fig. 14b, wherein u=u _x +jU _y ，U _x ＝U _sx +jU _sy ；U _x For the x-axis projection component of the applied voltage signal U in FIG. 14a, U _y For its Y-axis projection component; u (U) _sx And U _sy Respectively standard sampling resistor R _s Voltage U on _s Projection components in the x-axis and the y-axis. Z is Z _DUTm For the measurement, the imaginary part may be positive or negative, and the polarity of the phase is known.

Alternatively, the antenna impedance tuning device may use two direct digital frequency synthesizers (Direct Digital Synthesizer, DDS) to generate two paths of test signals of 1MHz to 30MHz, one path is used as a reference I/O signal of the system, the other path is used as an output signal to provide vector excitation of impedance test, and the vector excitation is loaded onto the tested antenna impedance, such as the signal source 132 in fig. 1 is used as an excitation signal and a test reference vector of the antenna impedance test, the stability of which is critical to the measurement accuracy, and the schematic diagram of the DDS signal source is shown in fig. 15.

1204. The tuning circuit is determined based on the target matching network form.

In the embodiment of the invention, after the antenna impedance tuning device determines the target matching network form, the capacitor and the inductor can be configured on the target matching network form, so as to obtain the tuning circuit.

1205. The impedance of the antenna is tuned by a tuning circuit according to the target capacitance value and the target inductance value.

1206. And transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance.

Furthermore, the antenna impedance tuning device can determine the form of the matching network according to the antenna impedance, so that the matching network with the lowest standing wave ratio, the least number of elements and the fastest tuning speed can be obtained for tuning, and the accuracy and efficiency of impedance tuning are effectively improved.

Example IV

As shown in fig. 16, an embodiment of the present invention provides an antenna impedance tuning method, which may further include the steps of:

1601. and receiving radio frequency signals sent by the radio station.

In the embodiment of the invention, the antenna impedance tuning device needs to maintain real-time communication with the radio station so as to receive the radio frequency signal sent by the radio station.

1602. The target transmitting frequency is obtained from the radio frequency signal through a frequency detection circuit.

In the embodiment of the invention, a frequency detection circuit is arranged in the antenna impedance tuning device, and the frequency detection circuit can analyze a radio frequency signal to obtain a target transmitting frequency therein, and as shown in fig. 17, the principle schematic diagram of the frequency detection circuit is shown.

1603. And determining a target tuning parameter according to the target transmitting frequency.

1604. The sampling switch is opened, and the tuning switch is closed.

In the embodiment of the present invention, as shown in fig. 1, a sampling switch 114 and a tuning switch 115 are provided in a radio frequency network unit of an antenna impedance tuning device, when the antenna impedance tuning device needs to sample a signal and measure the antenna impedance, the sampling switch 114 is closed, and the tuning switch 115 is opened; when the antenna impedance tuning device needs to tune the impedance of the antenna, the tuning switch 115 is closed, and the sampling switch 114 is opened.

1605. The impedance of the antenna is tuned according to the target tuning parameter.

1606. And transmitting the signal to be transmitted according to the target transmitting frequency by tuning the antenna after impedance.

1607. The temperature value of the antenna impedance tuning device is detected in real time.

In the embodiment of the present invention, the thermometer 135 in fig. 1 is disposed in the antenna impedance tuning device, so that the temperature value of the antenna impedance tuning device can be detected in real time.

1608. And outputting alarm information when the temperature value reaches the temperature threshold value.

In the embodiment of the invention, if the antenna impedance tuning device detects that the current temperature reaches the temperature threshold value through the thermometer, alarm information is output to prompt that the current temperature of staff is too high and possibly dangerous.

The embodiment of the invention provides an antenna impedance tuning method, wherein an antenna impedance tuning device can acquire a signal to be transmitted and a target transmitting frequency of an antenna; determining target tuning parameters according to the target transmitting frequency, wherein the target tuning parameters comprise: a target capacitance value and a target inductance value; tuning the impedance of the antenna according to the target tuning parameter; transmitting a signal to be transmitted according to a target transmitting frequency by tuning the antenna after impedance; the antenna impedance tuning device can acquire the transmitting frequency from radio frequency signals transmitted by the radio station, and detect temperature change in real time in the tuning process, so that the danger caused by overhigh temperature is prevented. According to the scheme, the antenna impedance tuning device can automatically determine tuning parameters according to the transmitting frequency, so that the impedance is tuned, external signal transmitting equipment is not needed, the antenna impedance tuning device is provided with an antenna, full-band tuning can be realized according to the antenna impedance tuning device, the tuning range is enlarged, and the accuracy of impedance tuning is improved.

Example five

As shown in fig. 18, an embodiment of the present invention provides an antenna impedance tuning apparatus, including:

an acquiring module 1801, configured to acquire a signal to be transmitted and a target transmission frequency of an antenna;

a processing module 1802, configured to determine target tuning parameters according to a target transmission frequency, where the target tuning parameters include: a target capacitance value and a target inductance value;

the processing module 1802 is further configured to tune an impedance of the antenna according to the target tuning parameter;

and a transceiver module 1803, configured to transmit, by tuning the antenna after impedance, a signal to be transmitted according to the target transmission frequency.

Optionally, the processing module 1802 is specifically configured to control the first switch corresponding to each capacitor according to the target capacitance value, so that at least one capacitor in the tuning circuit works, and the total capacitance value of the tuning circuit is the target capacitance value;

the processing module 1802 is specifically configured to control the second switch corresponding to each inductor according to the target inductance value, so that at least one inductor in the tuning circuit works, and the total inductance value of the tuning circuit is the target inductance value;

the processing module 1802 is specifically configured to tune an impedance of an antenna through at least one capacitor and at least one inductor.

Optionally, a plurality of capacitors are connected in parallel, and each capacitor is connected in series with a first switch;

a plurality of inductors are connected in series, and each inductor is connected with a second switch in parallel.

Optionally, the processing module 1802 is further configured to supply, through a power supply circuit, power to the first switch corresponding to each capacitor and the second switch corresponding to each inductor.

Optionally, the processing module 1802 is specifically configured to determine a target matching network form according to an impedance of the antenna;

the processing module 1802 is specifically configured to determine a tuning circuit according to a target matching network format;

the processing module 1802 is specifically configured to tune, by a tuning circuit, an impedance of the antenna according to the target capacitance value and the target inductance value.

Optionally, an acquiring module 1801 is specifically configured to acquire multiple initial matching network forms;

the processing module 1802 is specifically configured to determine an initial tuning network of each initial matching network form according to the target capacitance value and the target inductance value;

the processing module 1802 is specifically configured to determine a target matching network form corresponding to the target tuning network according to the network parameter of each initial tuning network;

Optionally, the processing module 1802 is further configured to perform synthesis transformation on the sampled signal to obtain a direct current signal;

the transceiver module 1803 is further configured to output a direct current signal through the antenna, and receive a reflected signal corresponding to the direct current signal;

the processing module 1802 is further configured to obtain a reflection coefficient according to the direct current signal and the reflection signal;

the processing module 1802 is further configured to obtain an impedance of the antenna according to the reflection coefficient.

Optionally, the processing module 1802 is further configured to set the impedance of the antenna in series with a standard sampling resistor, to obtain an impedance unit to be measured;

the acquiring module 1801 is further configured to acquire, by using a voltmeter, a total voltage of the impedance unit to be measured and a first voltage of the standard sampling resistor;

the processing module 1802 is further configured to obtain an impedance of the antenna according to the total voltage, the first voltage, and a resistance value of the standard sampling resistor.

Optionally, the processing module 1802 is specifically configured to determine a target tuning parameter corresponding to the target transmission frequency according to the target transmission frequency and a corresponding relationship between the pre-stored tuning parameter and the transmission frequency of the antenna.

Optionally, the processing module 1802 is specifically configured to detect a standing-wave ratio of the tuning circuit by using a standing-wave ratio detector;

The transceiver module 1803 is specifically configured to transmit, when the standing-wave ratio is detected to be within the range of the preset standing-wave ratio, a signal to be transmitted according to the target transmission frequency by tuning the antenna after impedance.

Optionally, the processing module 1802 is further configured to open the sampling switch and close the tuning switch;

Optionally, the transceiver module 1803 is specifically configured to receive a radio frequency signal sent by the radio station;

the acquiring module 1801 is specifically configured to acquire, by using a frequency detection circuit, a target transmission frequency from the radio frequency signal.

Optionally, the processing module 1802 is further configured to detect a temperature value of the antenna impedance tuning device in real time;

the transceiver module 1803 is further configured to output alarm information when the temperature value reaches the temperature threshold, where the alarm information is used to warn that the current temperature is too high.

In the embodiment of the present invention, each module may implement the antenna impedance tuning method provided in the above embodiment of the method, and may achieve the same technical effects, so that repetition is avoided, and no description is repeated here.

As shown in fig. 19, an embodiment of the present invention further provides a terminal device, where the terminal device may include:

A memory 1901 in which executable program codes are stored;

a processor 1902 coupled with a memory 1901;

the processor 1902 invokes executable program codes stored in the memory 1901, and executes the antenna impedance tuning method executed by the terminal device in the above method embodiments.

The present invention provides a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute some or all of the steps of the method as in the above method embodiments.

Embodiments of the present invention also provide a computer program product, wherein the computer program product, when run on a computer, causes the computer to perform some or all of the steps of the method as in the method embodiments above.

The embodiment of the invention also provides an application publishing platform, wherein the application publishing platform is used for publishing a computer program product, and the computer program product, when running on a computer, causes the computer to execute part or all of the steps of the method as in the above method embodiments.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art will also appreciate that the embodiments described in the specification are alternative embodiments and that the acts and modules referred to are not necessarily required for the present invention.

In various embodiments of the present invention, it should be understood that the sequence numbers of the foregoing processes do not imply that the execution sequences of the processes should be determined by the functions and internal logic of the processes, and should not be construed as limiting the implementation of the embodiments of the present invention.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units described above, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a memory, comprising several requests for a computer device (which may be a personal computer, a server or a network device, etc., in particular may be a processor in a computer device) to execute some or all of the steps of the above-mentioned method of the various embodiments of the present invention.

Those of ordinary skill in the art will appreciate that all or part of the steps of the various methods of the above embodiments may be implemented by a program that instructs associated hardware, the program may be stored in a computer readable storage medium including Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disk Memory, magnetic disk Memory, tape Memory, or any other medium that can be used for carrying or storing data that is readable by a computer.

Claims

1. An antenna impedance tuning method, applied to an antenna impedance tuning device, where an antenna is disposed on the antenna impedance tuning device, the method comprising:

acquiring a signal to be transmitted and a target transmitting frequency of the antenna;

determining a target matching network form according to the impedance of the antenna, wherein the target matching network form is a tuning network with the highest network parameter in an initial tuning network;

determining a tuning circuit according to the target matching network form;

tuning the impedance of the antenna through the tuning circuit according to the target capacitance value and the target inductance value;

2. The method of claim 1, wherein a plurality of capacitors and a plurality of inductors are provided in a tuning circuit, and wherein tuning the impedance of the antenna by the tuning circuit based on the target capacitance value and the target inductance value comprises:

3. The method of claim 2, wherein said plurality of capacitors are connected in parallel, each of said capacitors being connected in series with one of said first switches;

4. A method according to claim 3, wherein the antenna impedance tuning device has a supply circuit arranged therein, the method further comprising:

5. The method of claim 1, wherein determining a target matching network form based on the impedance of the antenna comprises:

acquiring a plurality of initial matching network forms;

and determining the target matching network form corresponding to the target tuning network according to the network parameters of each initial tuning network.

6. The method of claim 5, wherein prior to determining the target matching network form based on the impedance of the antenna, the method further comprises:

7. The method of claim 5, wherein prior to determining the target matching network form based on the impedance of the antenna, the method further comprises:

8. The method according to any one of claims 1 to 7, wherein said determining a target tuning parameter from said target transmission frequency comprises:

9. The method according to any one of claims 1 to 7, wherein said transmitting said signal to be transmitted at said target transmission frequency by tuning an antenna after impedance, comprises:

10. A method according to any one of claims 1 to 7, wherein a tuning switch and a sampling switch are provided in the antenna impedance tuning device, and wherein before determining the target matching network form from the impedance of the antenna, the method further comprises:

opening the sampling switch and closing the tuning switch;

11. The method according to any one of claims 1 to 7, wherein the obtaining the target transmission frequency of the antenna comprises:

receiving radio frequency signals sent by a radio station;

12. The method according to any one of claims 1 to 7, further comprising:

13. An antenna impedance tuning device, wherein an antenna is provided on the antenna impedance tuning device, the antenna impedance tuning device comprising:

the acquisition module is used for acquiring a signal to be transmitted and a target transmission frequency of the antenna;

the processing module is specifically configured to determine a target matching network form according to an impedance of the antenna, where the target matching network form is a tuning network with a highest network parameter in an initial tuning network; determining a tuning circuit according to the form of the target matching network; tuning the impedance of the antenna through a tuning circuit according to the target capacitance value and the target inductance value;

14. A terminal device, characterized in that the terminal device comprises:

a memory storing executable program code;

and a processor coupled to the memory;

the processor invokes the executable program code stored in the memory for performing the antenna impedance tuning method of any one of claims 1 to 12.

15. A computer-readable storage medium, comprising: computer instructions stored on the computer readable storage medium, which when executed by a processor, implement the antenna impedance tuning method of any one of claims 1 to 12.