CN114866096A

CN114866096A - Antenna impedance tuning method, antenna impedance tuning device, terminal equipment and storage medium

Info

Publication number: CN114866096A
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: 2022-08-05
Anticipated expiration: 2042-04-15
Also published as: CN114866096B

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 on antenna impedance is needed to be solved at present. The method comprises the following steps: acquiring a signal to be transmitted and a target transmission frequency of an antenna; determining a target tuning parameter according to a target transmitting frequency, wherein the target tuning parameter comprises: 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 transmission frequency through the antenna after the impedance is tuned.

Description

Antenna impedance tuning method, antenna impedance tuning 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 applied more and more. The short-wave radio station of long distance needs extremely high transmission power, because the input impedance of antenna changes along with the surrounding environment is comparatively obvious, when antenna impedance changes, the impedance between transmitter and antenna can become unmatched. Impedance mismatch between the antenna and the feeder can enable part of the output power of the transmitter final stage sent by the feeder to be reflected back by the antenna, so that the normal working state of the final stage power amplifier is influenced, the final stage power amplifier is possibly heated and even burnt, the transmitting efficiency of the system is reduced, and potential safety hazards exist. Most of the existing medium-long wave tuning technologies are analog motor tuning, but 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 realize automatic, fast and accurate tuning of the antenna impedance becomes a problem which needs to be solved at present.

Disclosure of Invention

Embodiments of the present invention provide an antenna impedance tuning method, an antenna impedance tuning device, a terminal device, and a storage medium, so as to solve the problem that how to implement automatic, fast, and accurate tuning of an antenna impedance in the prior art is a problem that needs to be solved at present.

In a first aspect, an antenna impedance tuning method is provided, where an antenna is disposed on an antenna impedance tuning apparatus, and the method includes: acquiring a signal to be transmitted and a target transmission frequency of the antenna;

determining a target tuning parameter according to the target transmitting frequency, wherein the target tuning parameter comprises: 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 transmission frequency through the antenna after the impedance is tuned.

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

controlling a 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;

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 first switch;

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 apparatus, 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 the first aspect of the embodiment of the present invention, the tuning the impedance of the antenna according to the target tuning parameter 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;

tuning, by the tuning circuit, an impedance of the antenna according to the target capacitance value and the target inductance value.

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

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

and 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 determining the target matching network form according to the impedance of the antenna, the method further includes:

carrying out synthesis transformation on 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.

the impedance of the antenna is connected with a standard sampling resistor in series to obtain an impedance unit to be tested;

acquiring the total voltage of the impedance unit to be detected 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 the 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 parameters corresponding to the target transmitting frequency according to the target transmitting frequency and the corresponding relation between the prestored tuning parameters and the transmitting frequency of the antenna.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the transmitting, by the antenna after tuning the impedance, the signal to be transmitted according to the target transmission frequency includes:

detecting, by a standing-wave ratio detector, a standing-wave ratio of the tuned circuit;

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

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

opening the sampling switch and closing the tuning switch;

wherein 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 acquiring a target transmission frequency of the antenna includes:

receiving a radio frequency signal 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 the 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 on which an antenna is provided, the antenna impedance tuning apparatus including: the acquisition module is used for acquiring a signal to be transmitted and the target transmission frequency of the antenna;

a processing module, configured to determine a target tuning parameter according to the target transmitting frequency, where the target tuning parameter includes: a target capacitance value, and a target inductance value;

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

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

In a third aspect, a terminal device is provided, including:

a memory storing executable program code;

a processor coupled with the memory;

the processor calls the executable program code stored in the memory to execute 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, the computer program causing 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 a ROM/RAM, a magnetic or optical disk, or the like.

In a fifth aspect, there is provided a computer program product for causing a computer to perform 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.

A sixth aspect provides an application publishing platform for publishing 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 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 obtain a signal to be transmitted and the target transmission frequency of the antenna; determining a target tuning parameter according to a target transmitting frequency, wherein the target tuning parameter comprises: 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 transmission frequency through the antenna after the impedance is tuned. 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 without external signal transmitting equipment, the antenna is provided, the antenna impedance is tuned according to the capacitance and the inductance, full-frequency-band tuning can be achieved, the tuning range is expanded, and the accuracy of impedance tuning is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

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

fig. 2 is a first flowchart illustrating 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 first schematic antenna radiation diagram of an antenna impedance tuning method according to an embodiment of the present invention;

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

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

fig. 5a is a first 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 flowchart of an antenna impedance tuning method according to an embodiment of the present invention;

FIG. 7 is a graphical illustration of the standing wave ratio and the 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 circuit diagram of an inductor bank according to an embodiment of the present invention;

fig. 9a is a first 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 provided in an embodiment of the present invention;

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

FIG. 10c is a schematic diagram of a second testing scheme of the standing-wave ratio detection circuit according to the 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 third schematic flowchart of an antenna impedance tuning method according to an embodiment of the present invention;

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

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

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

fig. 14b is a voltage decomposition diagram 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 provided by an embodiment of the invention;

fig. 16 is a schematic flowchart of an antenna impedance tuning method 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 apparatus 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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first" and "second," and the like, in the description and in the claims of the present invention are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first switch and the second switch, etc. are used to distinguish the different switches, rather than to describe a particular order of the switches.

The terms "comprises," "comprising," and any other variation 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, but may include other steps or elements not 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 "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "such as" in an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The executing main body of the antenna impedance tuning method provided in the embodiment of the present invention may be the antenna impedance tuning device and the terminal device, or may also be a functional module and/or a functional entity capable of implementing the antenna impedance tuning method in the antenna impedance tuning device and the terminal device, which may be determined specifically according to actual use requirements, and the embodiment of the present invention is not limited. The following takes an antenna impedance tuning device as an example to exemplarily describe the antenna impedance tuning method provided by the embodiment of the present invention.

As shown in fig. 1, which is a schematic diagram of an antenna impedance tuning apparatus according to an embodiment of the present invention, the antenna impedance tuning apparatus 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 inductor bank 112, an adjustable capacitor bank 113, a sampling switch 114, and a tuning switch 115; the detection unit 12 may include a standing-wave ratio detector 121 and a phase detector 122; the processor unit 13 may include: a microprocessor 131, a signal source 132, a controller 133, a memory 134, and a thermometer 135; the antenna impedance tuning device may interact with the station 14. The antenna impedance tuning device is explained in detail by way of the following embodiments.

Example one

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

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

In the embodiment of the present 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 obtain a signal to be transmitted and a target transmission frequency of the antenna, where the target transmission frequency may be a frequency when the antenna transmits the signal to be transmitted outwards.

Optionally, in an ideal state, in order to ensure the antenna radiation efficiency when the radio station transmits signals, it is generally required that the effective length of the antenna can reach a quarter wavelength, and the wavelength of the frequency band used by the medium-long wave radio station is longer, for example, the wavelength is 1000m when the frequency is 300kHz, so the effective length of the antenna needs to be more than 250 m. For convenience of use, the size of the antenna cannot be too large, and according to different requirements of communication distance or frequency, different antenna lengths (50m, 100m or 150m, currently 150m monopole antenna is selected to be laid horizontally on the ground, at this time, the antenna has strong directivity on a horizontal plane, and radiation at two ends along the axial direction is strongest, so when 150m antenna is laid, the axial direction of the antenna should be directed to the communication direction as much as possible, as shown in fig. 3, a three-dimensional coordinate system is established with a 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, the direction of the vertical ground plane is a Z axis, that is, the plane XOY is the ground, since the antenna is laid directly on the ground, the radiation energy of the antenna is absorbed by the ground, and the lower the electrical conductivity is, the stronger the absorption is, which causes the radiation efficiency of the antenna to be reduced.

As an example, as shown in fig. 4 a-4 c, the radiation diagrams of the antennas corresponding to the antennas with different frequencies are shown, and the left area of each diagram shows the antenna gain corresponding to different light and dark patterns, which can be used to represent the radiation field strength 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 diffused outward from the antenna starting point O along the axial X direction of the antenna; in FIG. 4b, the antenna frequency is 300kHz, and the radiation of the antenna is diffused outward from the antenna starting point O along the axial X direction of the antenna; in FIG. 4c, the antenna frequency is 400kHz, and the radiation of the antenna is diffused outward from the antenna starting point O along the axial X direction of the antenna; by comparison, it can be seen that the higher frequency antenna radiates more strongly, i.e. the higher frequency antenna at the same location has a higher antenna gain.

202. And determining target tuning parameters according to the target transmitting frequency.

In this embodiment of the present invention, the antenna impedance tuning apparatus 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 a radiation result of the antenna, the antenna has a short effective length and is close to the ground, so that the antenna is capacitive as a whole, and an antenna network matching box needs to be arranged 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 axis of the antenna is directed, 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 a pure resistance type, an inductance type and a capacitance type, which are respectively referred to as a resistance type, an inductance type and a capacitance type. The relation between the current and the voltage of the pure resistance type load conforms to ohm's law, namely the current is equal to the ratio between the voltage and the resistance; the inductance and the capacitance can refer to the phase relation between voltage and current in the circuit, when the load is inductive, the voltage phase leads the current, and the current phase lags the voltage, namely, the load is inductive; when the load is a capacitive load, the voltage phase lags the current and the current phase leads 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 by 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 circuit 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 circuit of fig. 5b, so as to expand the matching capability of the network and convert the inverted L-shaped matching network into a Π -shaped network.

The capacitance value of each capacitor and the inductance value of each inductor may be adjusted according to the impedance of the antenna or the transmission frequency of the antenna, and the embodiments of the present invention are not limited thereto.

203. And tuning the impedance of the antenna according to the target tuning parameter.

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

It should be noted that, a long-distance short-wave radio station needs extremely high transmission power, and since the input impedance of an antenna changes obviously with the surrounding environment, when the impedance of the antenna changes, the impedance between a transmitter and the antenna becomes mismatched. Impedance mismatch between the antenna and the feeder can enable part of the output power of the transmitter final stage sent by the feeder to be reflected back by the antenna, so that the normal working state of the final stage power amplifier is influenced, the final stage power amplifier is possibly heated and even burnt, the transmitting efficiency of the system is reduced, and potential safety hazards exist. The antenna impedance tuning device tunes the impedance of the antenna according to the target tuning parameters so as to tune the antenna impedance and the output impedance of the station, so that the antenna impedance and the output impedance of the station can be matched.

204. And transmitting the signal to be transmitted according to the target transmission frequency through the antenna after the impedance is tuned.

In the embodiment of the invention, after the antenna impedance tuning device tunes the antenna, the impedance of the antenna is matched with the output impedance of the radio station, and the antenna with the tuned impedance can transmit a signal to be transmitted according to the target transmission frequency.

The embodiment of the invention provides an antenna impedance tuning method.A tuning device of the antenna impedance can obtain a signal to be transmitted and the target transmission frequency of an antenna; determining a target tuning parameter according to a target transmitting frequency, wherein the target tuning parameter comprises: 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 transmission frequency through the antenna after the impedance is tuned. 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 without external signal transmitting equipment, the antenna is provided, the antenna impedance is tuned according to the capacitance and the inductance, full-frequency-band tuning can be achieved, the tuning range is expanded, 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 the target transmission frequency of the antenna.

602. And determining a target tuning parameter corresponding to the target transmitting frequency according to the target transmitting frequency and the corresponding relation between the prestored tuning parameter and the transmitting frequency of the antenna.

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

It should be noted that, when tuning parameters of the tuning circuit are adjusted, the capacitors have different fixed capacitance values, and the inductors are part of inductance values that can be adjusted to operate in the tuning circuit.

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

TABLE 1 corresponding relationship table of transmission frequency, target inductance value and target capacitance value of antenna

Transmitting frequency/kHz of antenna	Target inductance value/uH	Target capacitance value/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 the data is tuned, matching between the antenna impedance and the radio station output impedance can be realized, that is, the standing-wave ratio of the antenna can be kept within a standard range, as shown in fig. 7, a schematic curve diagram between the standing-wave ratio of the antenna and the transmitting frequency of the antenna is shown, a coordinate system is established by taking the transmitting frequency of the antenna as a horizontal coordinate and taking the standing-wave ratio of the antenna as a vertical coordinate, the standing-wave ratio obtained after the antenna impedance is tuned according to the target tuning parameters and the transmitting frequency of the antenna are correspondingly drawn in the coordinate system and connected to be a curve 71, and a variation trend of the standing-wave ratio when the capacitance and the inductance are varied can be seen, wherein a dotted line 72 is a preset standing-wave ratio threshold, and the different inductance values and capacitance values basically ensure that the standing-wave ratios of the full frequency band are both less than or equal to 2.5 and both 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 present invention, when the antenna impedance tuning device configures the capacitor in the tuning circuit according to the target capacitance value, it is necessary to ensure that the total capacitance value in the tuning circuit is the target capacitance value, and at least one capacitor needs to be present in the tuning circuit for operation.

Optionally, a capacitor bank, i.e. the tunable capacitor bank 113 in fig. 1, may be provided in the tuning circuit, and the capacitor bank may include a plurality of capacitors with different capacitance values, the capacitors are connected in parallel, and each capacitor is connected in series with a first switch, as shown in fig. 8a, which is a schematic circuit diagram of the capacitor bank, where C is a component of the capacitor bank ₁ 、C ₂ 、C ₃ 、C _n Are in parallel relationship with each other, and, C ₁ And S ₁ In series, C ₂ And S ₂ In series, C ₃ And S ₃ In series, C _n And S _n Are connected in series.

When the first 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 into the tuning circuit; illustratively, as shown in FIG. 8a, when S1 is closed, C ₁ Namely, the connecting circuit starts to work; when S1 is open, C ₁ The non-connected circuit suspends the operation.

The equivalent capacitance values of the capacitors connected in parallel are larger than that of any capacitor, the voltages between two plates of the capacitors connected in parallel are the same, the total charged capacity of the capacitors connected in parallel is the sum of the charged capacities of the capacitors, that is, the equivalent capacitance values of the capacitors connected in parallel are equal to the sum of the capacitance values of the capacitors, that is, C is equal to C ₁ +C ₂ +C ₃ +…+C _n Wherein, C ₁ 、C ₂ 、C ₃ 、C _n The capacitance value of each capacitor is respectively, and C is the total capacitance value of the plurality of capacitors connected in parallel, so that the antenna impedance tuning device can calculate the plurality of capacitors after acquiring a target capacitance value, and a 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.

In addition, a plurality of the series-connected units are connected in seriesThe equivalent capacitance value of the capacitors is smaller than that of any capacitor, the charged amounts of the capacitors connected in series are equal, namely the total electric quantity Q of the capacitor bank, the total voltage of the capacitors connected in series is equal to the sum of the voltages of the capacitors, namely, the reciprocal of the equivalent capacitance value of the capacitors connected in series is equal to the sum of the reciprocal of the capacitance values, namely

Wherein, C 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 disposed in the antenna impedance tuning device, and the antenna impedance tuning device may 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 present invention, when the antenna impedance tuning device configures the inductor in the tuning circuit according to the target inductance value, it is necessary to ensure that the total value of the inductor in the tuning circuit is the target inductance value, and at least one inductor needs to be present in the tuning circuit to operate.

Optionally, an inductance group, i.e. the adjustable inductance group 112 in fig. 1, may be provided in the tuning circuit, the inductance group may include a plurality of inductances of different inductances, the inductances are in series, and each inductance is connected in parallel with a second switch, as shown in fig. 8b, which is a schematic circuit diagram of the inductance group, where L in the inductance group is L ₁ 、L ₂ 、L ₃ 、L _n Are in series relationship with each other, and L ₁ And S ₁ In parallel, L ₂ And S ₂ In parallel, L ₃ And S ₃ In parallel, L _n And S _n And (4) connecting in parallel.

When the second switch is in an off state, the corresponding inductor starts to work, namely the inductor is connected into the tuning circuit; when the second switch is in a closed stateWhen the frequency of the frequency is higher than the frequency of the frequency, the corresponding inductor stops working, namely the inductor is not connected with a tuning circuit; illustratively, as shown in FIG. 8b, when S1 is OFF, L ₁ Namely, the connecting circuit starts to work; when S1 is closed, L ₁ The non-connected circuit suspends the operation.

The inductance equivalent value of each of the plurality of inductors connected in series is larger than the inductance equivalent value of any one of the inductors, and the inductance equivalent value of each of the plurality of inductors connected in series is equal to the sum of the inductance values of the inductors, i.e., L ═ L ₁ +L ₂ +L ₃ +…+L _n Wherein L is ₁ 、L ₂ 、L ₃ 、L _n And L is the total inductance value of the inductors connected in series, so that the antenna impedance tuning device can calculate the inductors after acquiring the target inductance value, and close the second switch corresponding to the inductor with the sum of the inductance values being the target inductance value, so that the inductors start to work.

The equivalent inductance values of the plurality of parallel inductors are smaller than the inductance value of any one inductor, and the reciprocal of the equivalent inductance value of the plurality of parallel inductors is equal to the sum of the reciprocals of the inductance values, that is, the inductance value of each inductor is equal to the sum of the reciprocals of the inductance values

Wherein L is ₁ 、L ₂ 、L ₃ 、L _n The inductance value of each inductor is, and L is the total inductance value of the plurality of inductors connected in parallel.

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

As an optional implementation manner, when configuring the capacitance and the inductance in the tuning circuit according to the target capacitance value and the target inductance value, the antenna impedance tuning apparatus can be implemented in at least the following two manners:

the first method is as follows: 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 is used for the adjustment of the inductance coil; k8 is used for the regulation to the electric capacity, is mainly the switching of 1500pF and 7000pF, and 1500pF are used for the high band, and 7000pF is used for the low band.

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

The second method comprises the following steps: the vector tuning approach.

As shown in fig. 9b, the antenna impedance tuning device changes the constant value inductors and capacitors into binary inductor and capacitor schemes based on the customized tuning mode, i.e. 8 inductors are connected in series, and each inductor is connected in parallel with a vacuum relay, so that 256-level stepping of the inductors can be realized, and the inductor steps are as shown in the following table 2:

TABLE 2 inductance gear corresponding 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 means of at least one capacitor and at least one inductor.

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

It should be noted that the Standing Wave Ratio (VSWR) refers to the Ratio of the Voltage of the antinode of the Standing Wave to the Voltage of the valley, and is also called the 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, high-frequency energy is radiated by the antenna completely without energy reflection loss; when the standing-wave ratio is infinite, the total reflection is shown, and the energy is not radiated at all.

The standing-wave ratio can be detected by the standing-wave ratio detector 121 and the phase detector 122 in fig. 1, and the standing-wave ratio detector and the phase detector can monitor the operating 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, the detection of the standing wave ratio using the standing wave ratio detector may include two test schemes, one is a direct coupling test scheme, as shown in fig. 10b, but in this scheme the loss on the T5 secondary coil is about 200W, which is liable to overheat and damage the magnetic ring; still another is a weak coupling test scheme, as shown in fig. 10c, the rf copper bar 10c1 and the magnetic bar 10c2 are at a proper distance, and the coupling coefficient is adjusted, so as to obtain proper forward and reverse power.

Alternatively, the antenna impedance tuning device may perform numerical processing, measurement matching control, and the like using the microprocessor 131 in fig. 1. Because the output measurement data flow is large in the measurement process, a large amount of digital filtering and data processing are needed to calculate the accurate measurement antenna impedance, meanwhile, the antenna matching system needs to use an I/O relay to switch on and off corresponding matching capacitors and inductance networks according to the measured antenna impedance data, so that the antenna is matched with the output impedance of the transmitter after passing through the matching networks, the process needs a large amount of general microprocessor functions such as judgment, process statements and the like, the transceiving of communication signals of the short-wave radio station is also completed by the microprocessor, and the schematic diagram of the microprocessor is shown in fig. 11.

607. And when the standing-wave ratio is detected to be within the preset standing-wave ratio range, transmitting a signal to be transmitted according to the target transmission frequency through the antenna after the impedance is tuned.

In the embodiment of the present invention, if the antenna impedance tuning device detects that the current standing-wave ratio is within the preset standing-wave ratio range, which indicates that matching has been achieved between the antenna impedance and the radio station output impedance at this time, the antenna impedance tuning device may transmit a signal to be transmitted according to a target transmission frequency through the antenna after tuning the impedance.

The embodiment of the invention provides an antenna impedance tuning method.A tuning device of the antenna impedance can obtain a signal to be transmitted and the target transmission 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 transmission frequency through the antenna after the impedance is tuned. 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 without external signal transmitting equipment, the antenna is provided, the antenna impedance is tuned according to the capacitance and the inductance, full-frequency-band tuning can be achieved, the tuning range is expanded, and the accuracy of impedance tuning is improved.

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 respectively controlled by a plurality of switches, so that the combination mode of the capacitors and the inductors can be enriched, and the tuning range can be expanded; 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 the target transmission frequency of the antenna.

1202. And determining target tuning parameters according to the target transmitting frequency.

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

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

It should be noted that there are many forms of matching networks, including a Γ -type network, a T-type network, a pi-type network, a multi-stage network, a filter principle matching network, and so on; each network form is composed of different capacitance and inductance.

Optionally, determining a 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 parameter in the initial tuning network.

In this implementation, the antenna impedance tuning apparatus 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 standing wave ratio of the tuning network, number of elements of the tuning network, tuning speed of the tuning network, and so on; wherein, the lower the standing-wave ratio of the tuning network, the fewer the number of the elements of the tuning network, the faster the tuning speed of the tuning network, and the higher the network parameters.

For example, assuming that the initial matching network forms determined by the antenna impedance tuning device include a Γ -type network, a T-type network, and a π -type network, then configuring capacitance and inductance for each initial matching network form to obtain three initial tuning networks, at this time, detecting network parameters of the three initial tuning networks and comparing the network parameters, and then selecting the tuning network with the highest network parameter 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 also 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: carrying out synthesis transformation on 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, the antenna impedance tuning device may use a reflection bridge as a directional coupler, and the antenna impedance to be measured as one arm of the reflection bridge, and first synthesize the sampling signal into a dc signal; then, a reflection signal corresponding to the dc signal is obtained, so as to calculate a reflection coefficient, and further obtain an antenna impedance, where fig. 13a is a schematic diagram of a circuit principle of a reflection bridge.

It should be noted that the antenna impedance tuning device can determine the forward power of the dc signal and the reverse power of the reflected signal by the power meter, and then obtain the reflection coefficient according to the forward power and the reverse power,

moreover, a certain corresponding relation exists between the reflection coefficient and the antenna impedance, and the larger the reflection coefficient is, the larger the difference between the antenna impedance and 50 Ω is; the smaller the reflection coefficient, the smaller the difference between the antenna impedance and 50 Ω.

Optionally, the antenna impedance tuning apparatus performs synthesis conversion on the sampling signal, which may also be referred to as balun conversion, that is, two paths of signals are converted into one path of signal, where a sampling circuit is required to be used when the two paths of sampling signals are obtained, as shown in fig. 13b, the schematic diagram of the sampling circuit is shown, and errors of the system, such as line loss and signal leakage, also need to be eliminated 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 arranged 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 two is as follows: the impedance of the antenna is connected with a standard sampling resistor in series to obtain an impedance unit to be tested; acquiring the total voltage of the impedance unit to be detected 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.

In this implementation, the antenna impedance tuning device may use vector voltammetry, that is, a current is obtained by measuring a voltage U applied to the impedance unit to be measured and a voltage on a standard sampling resistor connected in series with the impedance of the antenna, so as to calculate the impedance of the antenna. As shown in fig. 14a, the antenna impedance Z _DUT And a standard sampling resistor R _s Arranged in series, the voltmeter can obtain the impedance unit to be measured, i.e. the antenna impedance Z _DUT And a standard sampling resistor R _s Total voltage U of (1), and standard sampling resistance R _s First voltage U _s 。

The method adopts a free axis method digital vector impedance measurement technology based on a vector voltammetry method, the phase detection reference standard of the free axis method can be selected at will, and only two coordinate axes are required to be kept orthogonal. In practical design, quadrature signal (I/Q signal) synchronous detection is adopted, I/Q components of measurement parameters are measured respectively, and real part and imaginary part of measured impedance are directly calculated, as shown in fig. 14b, where U ═ U- _x +jU _y ，U _x ＝U _sx +jU _sy ；

U _x Is the x-axis projection component, U, of the applied voltage signal U in FIG. 14a _y Is its Y-axis projection component; u shape _sx And U _sy Are respectively a standard sampling resistor R _s Voltage U on _s Projection components in the x-axis and y-axis. Z is a linear or branched member _DUTm For the measurement, the imaginary part can be positive or negative, and the polarity of the phase can be known.

Optionally, the antenna impedance tuning apparatus may use two Direct Digital Synthesizers (DDS) to generate two test signals of 1MHz to 30MHz, one of which is used as a reference I/O signal of the system, and the other of which is used as an output signal to provide vector excitation for impedance test, and the two test signals are loaded to the tested antenna impedance, for example, the signal source 132 in fig. 1 is used as an excitation signal and a test reference vector for the antenna impedance test, and the stability of the signal source is crucial to the accuracy of the measurement, and as shown in fig. 15, the schematic diagram of the DDS signal source is shown.

1204. And determining a tuning circuit according to the target matching network form.

In the embodiment of the invention, after the antenna impedance tuning device determines the target matching network form, the capacitance and inductance configuration can be carried out on the target matching network form, so that the tuning circuit is obtained.

1205. And tuning the impedance of the antenna through the 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 transmission frequency through the antenna after the impedance is tuned.

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 four

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

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

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

1602. And acquiring the target transmitting frequency from the radio frequency signal through a frequency detection circuit.

In the embodiment of the present invention, a frequency detection circuit is disposed in the antenna impedance tuning device, and the frequency detection circuit may analyze the radio frequency signal to obtain a target transmission frequency therein, as shown in fig. 17, a schematic diagram of the frequency detection circuit is shown.

1603. And determining target tuning parameters according to the target transmitting frequency.

1604. And opening the sampling switch and closing the tuning switch.

In the embodiment of the present invention, as shown in fig. 1, a sampling switch 114 and a tuning switch 115 are arranged in a radio frequency network unit of an antenna impedance tuning device, and when the antenna impedance tuning device needs to sample a signal and measure an 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. And tuning the impedance of the antenna according to the target tuning parameter.

1606. And transmitting the signal to be transmitted according to the target transmission frequency through the antenna after the impedance is tuned.

1607. And detecting the temperature value of the antenna impedance tuning device in real time.

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

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

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, the antenna impedance tuning device outputs alarm information to prompt a worker that the current temperature is too high and possibly dangerous.

The embodiment of the invention provides an antenna impedance tuning method.A tuning device of the antenna impedance can obtain a signal to be transmitted and the target transmission frequency of an antenna; determining a target tuning parameter according to a target transmitting frequency, wherein the target tuning parameter comprises: a target capacitance value, and a target inductance value; tuning the impedance of the antenna according to the target tuning parameters; transmitting a signal to be transmitted according to a target transmission frequency through the antenna after the impedance is tuned; the antenna impedance tuning device can acquire the transmitting frequency from the radio frequency signal sent by the radio station, and detect the temperature change in real time in the tuning process, so as to prevent danger caused by overhigh temperature. 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 without external signal transmitting equipment, the antenna is provided, the antenna impedance is tuned according to the capacitance and the inductance, full-frequency-band tuning can be achieved, the tuning range is expanded, 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 obtaining module 1801, configured to obtain a signal to be transmitted and a target transmission frequency of an antenna;

a processing module 1802, configured to determine a target tuning parameter according to a target transmitting frequency, where the target tuning parameter includes: a target capacitance value, and a target inductance value;

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

the transceiver module 1803 is configured to transmit a signal to be transmitted according to a target transmission frequency through the antenna with the tuned impedance.

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 a total capacitance value of the tuning circuit is the target capacitance value;

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

the processing module 1802 is specifically configured to tune the impedance of the 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 power to the first switch corresponding to each capacitor and the second switch corresponding to each inductor through the power supply circuit.

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

a processing module 1802, specifically configured to determine a tuning circuit according to a target matching network form;

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

Optionally, the obtaining module 1801 is specifically configured to obtain multiple initial matching network forms;

a processing module 1802, configured to determine an initial tuning network in each initial matching network form according to the target capacitance value and the target inductance value;

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

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

the transceiver module 1803 is further configured to output a direct current signal through an 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 the standard sampling resistor, so as to obtain an impedance unit to be measured;

the obtaining module 1801 is further configured to obtain, through 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 the 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 transmitting frequency according to the target transmitting frequency and a correspondence between a prestored tuning parameter and the transmitting frequency of the antenna.

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

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

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

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

the obtaining module 1801 is specifically configured to obtain a target transmission frequency from the radio frequency signal through the frequency detection circuit.

Optionally, the processing module 1802 is further configured to detect a temperature value of the antenna impedance tuning apparatus 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 method embodiment, and may achieve the same technical effect, and for avoiding repetition, details are not described 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 code is stored;

a processor 1902 coupled with a memory 1901;

the processor 1902 calls the executable program code stored in the memory 1901, and executes the antenna impedance tuning method executed by the terminal device in the above-mentioned embodiments of the methods.

Embodiments of the present invention provide 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 above method embodiments.

Embodiments of the present invention further provide an application publishing platform, where the application publishing platform is configured to publish a computer program product, where the computer program product, when running on a computer, causes the computer to perform some or all of the steps of the method 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 should also appreciate that the embodiments described in this specification are exemplary and alternative embodiments, and that the acts and modules illustrated are not required in order to practice the invention.

In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not imply an inevitable order of execution, and the execution order of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated units, if implemented as software functional units and sold or used as a stand-alone product, may be stored in a computer accessible memory. Based on such understanding, the technical solution of the present invention, which is a part of or contributes to the prior art in essence, or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several requests for causing a computer device (which may be a personal computer, a server, a network device, or the like, and may specifically be a processor in the computer device) to execute part or all of the steps of the above-described method of each embodiment of the present invention.

It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), 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 (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.

Claims

1. An antenna impedance tuning method is applied to an antenna impedance tuning device, wherein an antenna is arranged on the antenna impedance tuning device, and the method comprises the following steps:

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

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

2. The method of claim 1, wherein a plurality of capacitors and a plurality of inductors are disposed in a tuning circuit, and wherein tuning the impedance of the antenna according to the target tuning parameter comprises:

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

4. The method of claim 3, wherein a power supply circuit is disposed in the antenna impedance tuning apparatus, the method further comprising:

5. The method of claim 1, wherein tuning the impedance of the antenna according to the target tuning parameter comprises:

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

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

acquiring a plurality of initial matching network forms;

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

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

9. The method of any of claims 1 to 8, wherein determining a target tuning parameter based on the target transmit frequency comprises:

10. The method according to any one of claims 1 to 8, wherein said transmitting the signal to be transmitted at the target transmission frequency by the antenna after tuning the impedance comprises:

11. The method according to any one of claims 1 to 8, wherein a tuning switch and a sampling switch are provided in the antenna impedance tuning device, and before tuning the impedance of the antenna according to the target tuning parameter, the method further comprises:

opening the sampling switch and closing the tuning switch;

12. The method according to any one of claims 1 to 8, wherein the obtaining the target transmission frequency of the antenna comprises:

receiving a radio frequency signal sent by a radio station;

13. The method according to any one of claims 1 to 8, further comprising:

14. An antenna impedance tuning apparatus, wherein an antenna is provided on the antenna impedance tuning apparatus, the antenna impedance tuning apparatus comprising:

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

15. 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 of claims 1 to 13.

16. A computer-readable storage medium, comprising: the computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the antenna impedance tuning method of any one of claims 1 to 13.