CN112713904B - Composite tuning network and antenna tuner - Google Patents
Composite tuning network and antenna tuner Download PDFInfo
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- CN112713904B CN112713904B CN202011542230.2A CN202011542230A CN112713904B CN 112713904 B CN112713904 B CN 112713904B CN 202011542230 A CN202011542230 A CN 202011542230A CN 112713904 B CN112713904 B CN 112713904B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1072—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal by tuning the receiver frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of short wave communication equipment, and discloses a composite tuning network, which comprises: the first adjustable capacitor and the first adjustable inductor are sequentially connected in series between the radio frequency input end and a first node, and an auxiliary adjustable capacitor is arranged between the first node and the ground; a second adjustable capacitor and a second adjustable inductor are connected in parallel between the first adjustable capacitor and the first adjustable inductor, and each device is correspondingly connected with a relay; when the first adjustable capacitor and the second adjustable capacitor are connected into the radio frequency channel to form a main network of the capacitor network, the second adjustable inductor is connected into the radio frequency channel to serve as an auxiliary network of the capacitor network; when the first adjustable inductor and the second adjustable capacitor are connected to the radio frequency path to form a main network of the inductor network, the auxiliary adjustable capacitor is used as an auxiliary network of the inductor network. The invention overcomes the problem of low efficiency of partial frequency points of a capacitor network and an inductor network, and obviously improves the efficiency of the antenna tuning.
Description
Technical Field
The invention belongs to the technical field of short-wave communication equipment, and particularly relates to a composite tuning network and an antenna tuner. The impedance matching system is suitable for realizing the short-wave transceiver and the short-wave antenna by the antenna tuner.
Background
The short-wave communication system consists of a short-wave transceiver, an antenna tuner (hereinafter referred to as antenna tuner) and a short-wave antenna (hereinafter referred to as antenna), wherein the antenna tuner is called as an antenna feed system. The narrow-band antenna is a commonly used short-wave antenna, the input impedance of the narrow-band antenna changes with the frequency continuously, and the output impedance of a general short-wave transceiver is 50 ohms, so that the antenna modulation is needed to be used between the short-wave transceiver and the short-wave antenna to realize the complete matching of the short-wave transceiver and the short-wave antenna so as to transmit the power of the short-wave transceiver to the short-wave antenna to the maximum extent.
The transmission efficiency of the antenna feed system includes the efficiency of the antenna and the efficiency of the antenna tone. The efficiency of the antenna is related to the gain and directivity of the antenna, and generally, the efficiency is fixed after the form and size of the antenna are determined. The efficiency of the antenna tone mainly refers to the attenuation (difference loss) of signals passing through the antenna tone network, and the efficiency of the antenna tone is greatly different due to different tuning network forms of the antenna tone.
The tuning network form of the existing antenna tuning network unit comprises an inductance network and a capacitance network. The inductive network, i.e. the LC matching network, is a classical tuning network, and generally includes a Γ -type network and a Π -type network. The transmission efficiency of the simple gamma-type network is higher than that of the pi-type network, and the pi-type network can theoretically realize full-frequency-band tuning. A conventional pi-type inductor network is shown in fig. 1, in which a main tuning network is composed of a series inductor L1a and a parallel capacitor C1a, and an auxiliary tuning network is composed of a series capacitor C2a and a root parallel capacitor C3 a. The value of a general main tuning network device is determined in a binary mode, and the number, the maximum value, the minimum value and the like of the network devices can be determined according to factors such as the specific impedance characteristic of the antenna, the size and the weight of the antenna tuner and the like.
The values and quantities of the commonly used inductive network devices are as follows: the number of the series inductors L1a is 11, and the inductance values are respectively: 0.04 muH, 0.07 muH, 0.125 muH, 0.25 muH, 0.5 muH, 1 muH, 2 muH, 4 muH, 8 muH, 16 muH, 32 muH; the number of the parallel capacitors C1a is 10, and the capacitance values are respectively: 0.0075nF, 0.015nF, 0.03nF, 0.056nF, 0.11nF, 0.20nF, 0.33nF, 0.72nF, 1.5nF, 3.0 nF; root parallel capacitance C3a quantity is 6, and the capacitance value is respectively: 0.012nF, 0.024nF, 0.047nF, 0.091nF, 0.18nF, 0.33 nF; the number of the series capacitors C2a is 3, and the capacitance values are: 0.068nF, 0.15nF, 0.33 nF. The inductance network has the advantages of large tunable area, high stability and large volume and has the defects of large value of series inductance L1a and low efficiency of partial frequency points due to the introduction of an auxiliary network.
The conventional capacitor network is shown in fig. 2, in which a parallel capacitor C1b and a series capacitor C2b form a main tuning network, and a front-end parallel inductor L1b and a rear-end parallel inductor L2b form an auxiliary tuning network. The values and the number of the commonly used capacitor network devices are as follows: the number of the parallel capacitors C1b is 12, and the capacitance values are: 0.002nF, 0.0039nF, 0.0079nF, 0.015nF, 0.03nF, 0.056nF, 0.11nF, 0.20nF, 0.33nF, 0.72nF, 1.5nF, 3.0 nF; the number of the series capacitors C2b is 12, and the capacitance values are respectively: 0.0015nF, 0.0027nF, 0.0056nF, 0.012nF, 0.024nF, 0.047nF, 0.082nF, 0.15nF, 0.27nF, 0.56nF, 1.0nF, 2.0 nF; front-end shunt inductance L1b quantity is 3, and the inductance value is respectively: 0.5 muH, 1 muH, 2 muH; the back end parallel inductance L2b is 4, and the inductance value is respectively: 0.5 muH, 1 muH, 2 muH, 4 muH. The network is mainly used for matching short-circuit antennas, namely, the antenna with most of the impedance of the antenna positioned in an inductive area has the advantages of occupying less space than an inductive network and being suitable for miniaturized antenna tuning, and the network has the defect that the efficiency of partial frequency points is lower due to the introduction of an auxiliary network.
Therefore, auxiliary networks are introduced into the existing inductance network and capacitance network, and the problem of low efficiency of partial frequency points exists.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a composite tuning network and an antenna tuner, wherein the composite tuning network is designed according to an antenna impedance, and the advantages of a capacitor network and an inductor network are considered, and an auxiliary network is used or not used, so that the problem of low frequency point efficiency of the capacitor network and the inductor network is solved, the efficiency of an antenna tuning is significantly improved, and the radio frequency power of a transmitter is transmitted to the antenna to the maximum extent, thereby improving the radiation efficiency of an antenna feed system.
In order to achieve the above object, the present invention is achieved by the following means.
A composite tuning network, comprising: the first adjustable capacitor and the first adjustable inductor are sequentially connected in series between the radio frequency input end and a first node, and the first node is electrically communicated with the antenna;
an auxiliary adjustable capacitor is arranged between the first node and the ground;
a second adjustable capacitor and a second adjustable inductor are connected in parallel between the first adjustable capacitor and the first adjustable inductor, and the second adjustable capacitor and the second adjustable inductor are respectively grounded;
the first adjustable capacitor, the first adjustable inductor, the auxiliary adjustable capacitor, the second adjustable capacitor and the second adjustable inductor are respectively and correspondingly connected with a relay, so that the corresponding capacitors or inductors are switched between open circuit and short circuit;
when the first adjustable capacitor and the second adjustable capacitor are connected into the radio frequency channel to form a main network of the capacitor network, the second adjustable inductor is connected into the radio frequency channel to serve as an auxiliary network of the capacitor network;
when the first adjustable inductor and the second adjustable capacitor are connected to the radio frequency path to form a main network of the inductor network, the auxiliary adjustable capacitor is used as an auxiliary network of the inductor network.
Further, the first adjustable inductor is formed by connecting eight inductors in series, and the inductance values of the eight inductors are respectively: 0.04 muH, 0.07 muH, 0.125 muH, 0.25 muH, 0.5 muH, 1 muH, 2 muH, 4 muH.
Further, the second adjustable inductor is an inductor with an inductance value of 4 μ H.
Furthermore, the auxiliary adjustable capacitor is formed by connecting two capacitors in parallel, and the capacitance values of the two capacitors are 0.068nF and 0.15nF respectively.
Further, the first adjustable capacitor is formed by connecting twelve capacitors in series, and capacitance values of the twelve capacitors are respectively: 0.0015nF, 0.0027nF, 0.0056nF, 0.012nF, 0.024nF, 0.047nF, 0.082nF, 0.15nF, 0.27nF, 0.56nF, 1.0nF, 2.0 nF.
Further, the second adjustable capacitor is formed by connecting twelve capacitors in parallel, and capacitance values of the twelve capacitors are respectively: 0.002nF, 0.0039nF, 0.0079nF, 0.015nF, 0.03nF, 0.056nF, 0.11nF, 0.20nF, 0.33nF, 0.72nF, 1.5nF, 3.0 nF.
An antenna tuner comprising: the antenna comprises a detection unit, a control unit and a composite tuning network, wherein the detection unit detects the impedance and standing-wave ratio information of the current antenna and transmits the information to the control unit; and the control unit formulates a tuning flow according to the current detection information and controls corresponding relays in the composite tuning network to switch states through the driving circuit, so that each inductor and each capacitor in the composite tuning network are connected to or disconnected from the composite tuning network according to the tuning flow.
Further, when the detection unit detects that the real part of the antenna impedance is not more than 50 Ω and the imaginary part is more than zero, the control unit controls the first adjustable capacitor and the second adjustable capacitor to be connected to the radio frequency path to form a capacitor network for impedance tuning;
when the detection unit detects that the real part of the antenna impedance is greater than 50 Ω and the imaginary part is greater than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is performed by using the second adjustable inductor of the auxiliary network of the capacitor network, and then the tuning is performed by using the first adjustable capacitor and the second adjustable capacitor of the main network of the capacitor network.
Further, when the detection unit detects that the real part of the antenna impedance is not more than 50 Ω and the imaginary part is less than zero, the control unit controls the first adjustable inductor and the second adjustable capacitor to be connected to the radio frequency path to form an inductor network for tuning;
when the detection unit detects that the real part of the antenna impedance is greater than 50 omega and the imaginary part is less than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is carried out by using the auxiliary adjustable capacitor of the auxiliary network of the inductance network, and then the impedance tuning is carried out by using the first adjustable inductor and the second adjustable capacitor of the main network of the inductance network.
A tuning method uses the antenna tuner to perform impedance matching tuning between the short-wave transceiver and the short-wave antenna.
Compared with the prior art, the invention has the following beneficial effects:
the antenna tuning system has the advantages that the inductor and capacitor composite tuning network is designed, the advantages of the capacitor network and the inductor network are taken into consideration, the auxiliary network is used or not used, the problem that the frequency point efficiency of the capacitor network and the inductor network is low is solved, the antenna tuning efficiency is obviously improved, the radio frequency power of a transmitter is transmitted to the antenna to the maximum extent, and the radiation efficiency of the antenna feeding system is improved.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a prior art connection diagram of an inductive network;
FIG. 2 is a prior art connection diagram of a capacitor network;
FIG. 3 is a diagram of a composite tuning network connection in an embodiment of the present invention;
fig. 4 is a functional block diagram of an antenna tuner in an embodiment of the present invention;
FIG. 5 is an impedance diagram of an antenna according to an embodiment of the present invention;
fig. 6 is a comparison graph of the field strength test results of the composite tuning network of the present invention and the conventional inductive network.
Detailed Description
The embodiments and effects of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 3, the present invention provides a composite tuning network, including: a first adjustable capacitor C3C and a first adjustable inductor L1C sequentially connected in series between the radio frequency input end and a first node, the first node being in electrical communication with the antenna; an auxiliary adjustable capacitor C1C is arranged between the first node and the ground; a second adjustable capacitor C2C and a second adjustable inductor L2C are connected in parallel between the first adjustable capacitor C3C and the first adjustable inductor L1C, and the second adjustable capacitor C2C and the second adjustable inductor L2C are grounded respectively; the first adjustable capacitor C3C, the first adjustable inductor L1C, the auxiliary adjustable capacitor C1C, the second adjustable capacitor C2C and the second adjustable inductor L2C are respectively and correspondingly connected with a relay, so that the corresponding capacitors or inductors are switched between open circuit and short circuit;
when the first adjustable capacitor C3C and the second adjustable capacitor C2C are connected to a radio frequency path to form a main network of the capacitor network, the second adjustable inductor L2C is connected to the radio frequency path to serve as an auxiliary network of the capacitor network;
when the first adjustable inductor L1C and the second adjustable capacitor C2C are connected to a radio frequency path to form a main network of the inductor network, the auxiliary adjustable capacitor C1C serves as an auxiliary network of the inductor network.
As shown in fig. 3, the first adjustable inductor L1c of the embodiment of the present invention is formed by connecting eight inductors in series, where the inductance values of the eight inductors are: 0.04 muH, 0.07 muH, 0.125 muH, 0.25 muH, 0.5 muH, 1 muH, 2 muH, 4 muH. Compared with the existing inductance network, the number of the series inductors is reduced from 11 to 8, and no inductor with large inductance is provided, so that the loss is reduced.
The second adjustable inductor L2c of the embodiment of the present invention is an inductor with an inductance value of 4 μ H, which is increased compared to the prior art, i.e., L2b in fig. 2.
The auxiliary adjustable capacitor C1C of the embodiment of the invention is formed by connecting two capacitors in parallel, and the capacitance values of the two capacitors are 0.068nF and 0.15nF respectively. Both the amount and capacitance are reduced compared to C3a of fig. 1.
The first adjustable capacitor C3C of the embodiment of the present invention is formed by connecting twelve capacitors in series, and the capacitance values of the twelve capacitors are respectively: 0.0015nF, 0.0027nF, 0.0056nF, 0.012nF, 0.024nF, 0.047nF, 0.082nF, 0.15nF, 0.27nF, 0.56nF, 1.0nF, 2.0 nF. The second adjustable capacitor C2C in the embodiment of the present invention is formed by connecting twelve capacitors in parallel, and capacitance values of the twelve capacitors are respectively: 0.002nF, 0.0039nF, 0.0079nF, 0.015nF, 0.03nF, 0.056nF, 0.11nF, 0.20nF, 0.33nF, 0.72nF, 1.5nF, 3.0 nF.
Example 2
Referring to fig. 4, an antenna tuner of an embodiment of the present invention includes: the antenna comprises a detection unit, a control unit and a composite tuning network, wherein the detection unit detects the impedance and standing-wave ratio information of the current antenna and transmits the information to the control unit; and the control unit formulates a tuning flow according to the current detection information and controls corresponding relays in the composite tuning network to switch states through the driving circuit, so that each inductor and each capacitor in the composite tuning network are connected to or disconnected from the composite tuning network according to the tuning flow.
In the above embodiment, the switching process is the process of connecting or disconnecting the inductor or capacitor in the composite network element to or from the network according to the tuning procedure. The state of the network is thus constantly changed, and the detection unit in turn sends the control unit the information of the new impedance detected, thus constantly cycling until a perfect match between the short-wave transceiver and the short-wave antenna is achieved.
In this embodiment, the tuning process is described by taking an impedance original drawing of an antenna as an example, specifically referring to fig. 5.
When the antenna impedance is in the inductive region, a capacitive network is used for tuning. Specifically, the method comprises the following steps:
when the detection unit detects that the real part of the impedance of the antenna is not more than 50 omega and the imaginary part is more than zero, the control unit controls the first adjustable capacitor C3C and the second adjustable capacitor C2C to be connected into a radio frequency path to form a capacitor network for impedance tuning; when the detection unit detects that the real part of the antenna impedance is greater than 50 Ω and the imaginary part is greater than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is performed by using the auxiliary network second adjustable inductor L2C of the capacitor network, and then by using the main network first adjustable capacitor C3C and the second adjustable capacitor C2C of the capacitor network. Compared with the auxiliary network in the conventional capacitor network (i.e., the auxiliary network L2b in fig. 2), the auxiliary network L2c under such a condition has the advantages that the number of inductors is reduced to one, the inductance value is increased to 4 μ H, the loss is reduced, and the efficiency of the antenna tuning is improved.
The inductive network is used for tuning when the antenna impedance is in the capacitive region. Specifically, the method comprises the following steps:
when the detection unit detects that the real part of the antenna impedance is not more than 50 omega and the imaginary part is less than zero, the control unit controls the first adjustable inductor L1C and the second adjustable capacitor C2C to be connected to a radio frequency path to form an inductor network for tuning; when the detection unit detects that the real part of the antenna impedance is greater than 50 omega and the imaginary part is less than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is performed by using the auxiliary network of the inductor network and the auxiliary adjustable capacitor C1C, and then by using the main network of the inductor network, the first adjustable inductor L1C and the second adjustable capacitor C2C. Compared with the conventional inductor network (i.e., the auxiliary network C3a in fig. 1), the auxiliary network C1C under such conditions has a reduced number and capacitance, and the number and inductance of the series inductor L1C are reduced, which can significantly improve the efficiency of the antenna.
Example 3
The tuning method of the embodiment of the invention uses the antenna tuner to carry out impedance matching tuning between the short-wave transceiver and the short-wave antenna.
In practice, the capacitor and inductor do not lose power in an ideal situation, but in practical applications, the inductor and the capacitor are non-ideal devices, and the loss of the inductor and the capacitor is mainly related to the quality factor Q value of the inductor and the capacitor. Generally, the Q value of a capacitor is high (hundreds to thousands), and the loss of the capacitor is usually negligible. Due to the skin effect, proximity effect and the like of the current in the coil at high frequency, the Q value of the inductor is low (as low as about 10 at the lowest), and the loss is large. Generally, to reduce the losses of the antenna, the inductance used for the series inductors should be minimized in the tuning network, and the parallel inductors should be minimized or eliminated.
Based on the above analysis, the tuning network of the invention adopts a composite network form, as shown in fig. 4, wherein the second adjustable capacitor C2C and the first adjustable capacitor C3C form a main network of the capacitor network, and the parallel second adjustable inductor L2C is an auxiliary network; the first adjustable inductor L1C connected in series and the second adjustable capacitor C2C connected in parallel form a main network of the inductor network, and the auxiliary adjustable capacitor C1C connected in parallel at the root part is an auxiliary network. The second adjustable capacitor C2C is a common network of a capacitive network and an inductive network. The auxiliary network L2C and the capacitor C1C connected in parallel to the root can be adjusted according to the actual impedance of the antenna, and the auxiliary network can be used less or not.
Effect verification
The composite tuning network is applied to the antenna tuner of a certain model, the antenna tuner of the network form is verified, the full-band matching effect is good, the efficiency of the antenna tuner (antenna tuner) is obviously improved, the radio frequency power of a transmitter is transmitted to the antenna to the maximum extent, and the radiation efficiency of an antenna feed system is improved.
Under the condition that a transceiver, an antenna, receiving equipment, a testing instrument and the like are the same, the composite tuning network antenna and the conventional inductance network antenna are respectively adopted, under the condition of no shielding basically, the distance between a receiving end and a transmitting end is 5 kilometers, and the measured radiation field intensity test data is shown in figure 6. As can be seen from fig. 6, compared with the existing inductive network antenna tuning, the composite network antenna tuning of the present invention has the advantages that the efficiency is significantly improved below 7MHz in the low frequency band and above 17MHz in the high frequency band, so that the purposes of reducing the loss of the antenna tuning and improving the efficiency of the antenna tuning are achieved, and the radiation efficiency of the antenna feed system is improved.
In addition, because the series inductance L1c used by the composite network is greatly reduced, the purposes of volume reduction and weight reduction can be achieved while the ceiling adjusting efficiency is improved.
When the impedance of the antenna is in an inductive area, the composite tuning network uses the capacitor network for tuning; when the impedance of the antenna is in a capacitive area, the antenna is tuned by using the inductance network, the advantages of the capacitance network and the inductance network are taken into consideration, the auxiliary network is used less or not used, the problem that the frequency point efficiency of the capacitance network and the inductance network is low is solved, and the antenna tuning efficiency is obviously improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A composite tuning network, comprising: the first adjustable capacitor and the first adjustable inductor are sequentially connected in series between the radio frequency input end and a first node, and the first node is electrically communicated with the antenna;
an auxiliary adjustable capacitor is arranged between the first node and the ground;
a second adjustable capacitor and a second adjustable inductor are connected in parallel between the first adjustable capacitor and the first adjustable inductor, and the second adjustable capacitor and the second adjustable inductor are respectively grounded;
the first adjustable capacitor, the first adjustable inductor, the auxiliary adjustable capacitor, the second adjustable capacitor and the second adjustable inductor are respectively and correspondingly connected with a relay, so that the corresponding capacitors or inductors are switched between open circuit and short circuit;
when the first adjustable capacitor and the second adjustable capacitor are connected into the radio frequency channel to form a main network of the capacitor network, the second adjustable inductor is connected into the radio frequency channel to serve as an auxiliary network of the capacitor network;
when the first adjustable inductor and the second adjustable capacitor are connected to the radio frequency path to form a main network of the inductor network, the auxiliary adjustable capacitor is used as an auxiliary network of the inductor network.
2. The composite tuning network of claim 1, wherein the first adjustable inductor is formed by connecting eight inductors in series, and the inductance values of the eight inductors are: 0.04 muH, 0.07 muH, 0.125 muH, 0.25 muH, 0.5 muH, 1 muH, 2 muH, 4 muH.
3. The composite tuning network of claim 1, wherein the second tunable inductor is an inductor with an inductance value of 4 μ H.
4. The composite tuning network of claim 3, wherein the auxiliary tunable capacitor is formed by two capacitors connected in parallel, and the capacitance values of the two capacitors are 0.068nF and 0.15nF, respectively.
5. The composite tuning network of claim 1, wherein the first tunable capacitor is formed by connecting twelve capacitors in series, and the capacitance values of the twelve capacitors are respectively: 0.0015nF, 0.0027nF, 0.0056nF, 0.012nF, 0.024nF, 0.047nF, 0.082nF, 0.15nF, 0.27nF, 0.56nF, 1.0nF, 2.0 nF.
6. The composite tuning network of claim 1, wherein the second tunable capacitor is formed by connecting twelve capacitors in parallel, and the capacitance values of the twelve capacitors are respectively: 0.002nF, 0.0039nF, 0.0079nF, 0.015nF, 0.03nF, 0.056nF, 0.11nF, 0.20nF, 0.33nF, 0.72nF, 1.5nF and 3.0 nF.
7. An antenna tuner, comprising: a detection unit, a control unit and the composite tuning network of any one of claims 1-6, wherein the detection unit detects the impedance and standing wave ratio information of the current antenna and transmits the information to the control unit; and the control unit formulates a tuning flow according to the current detection information and controls corresponding relays in the composite tuning network to switch states through the driving circuit, so that each inductor and each capacitor in the composite tuning network are connected to or disconnected from the composite tuning network according to the tuning flow.
8. The antenna tuner of claim 7, wherein when the detection unit detects that the real part of the antenna impedance is not greater than 50 Ω and the imaginary part is greater than zero, the control unit controls the first tunable capacitor and the second tunable capacitor to be connected to the radio frequency path to form a capacitor network for impedance tuning;
when the detection unit detects that the real part of the antenna impedance is greater than 50 Ω and the imaginary part is greater than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is performed by using the second adjustable inductor of the auxiliary network of the capacitor network, and then the tuning is performed by using the first adjustable capacitor and the second adjustable capacitor of the main network of the capacitor network.
9. The antenna tuner of claim 8, wherein when the detecting unit detects that the real part of the antenna impedance is not greater than 50 Ω and the imaginary part is less than zero, the control unit controls the first adjustable inductor and the second adjustable capacitor to be connected to the radio frequency path to form an inductor network for tuning;
when the detection unit detects that the real part of the antenna impedance is greater than 50 omega and the imaginary part is less than zero, the tuning flow formulated by the control unit is as follows: the impedance tuning is carried out by using the auxiliary adjustable capacitor of the auxiliary network of the inductance network, and then the impedance tuning is carried out by using the first adjustable inductor and the second adjustable capacitor of the main network of the inductance network.
10. A tuning method, characterized in that an impedance matching tuning between a short wave transceiver and a short wave antenna is performed using an antenna tuner as claimed in any of claims 7-9.
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