CN219979817U

CN219979817U - Active antenna

Info

Publication number: CN219979817U
Application number: CN202321125914.1U
Authority: CN
Inventors: 隋文力; 王林东; 徐升; 杨瑞志
Original assignee: Beijing Safety Technology Co ltd; Inner Mongolia Autonomous Region Nuclear And Radiation Monitoring Center
Current assignee: Beijing Safety Technology Co ltd; Inner Mongolia Autonomous Region Nuclear And Radiation Monitoring Center
Priority date: 2023-05-10
Filing date: 2023-05-10
Publication date: 2023-11-07
Anticipated expiration: 2033-05-10

Abstract

The utility model provides an active antenna, which relates to the technical field of active antennas. According to the utility model, the antenna structure and the active module are subjected to module separation treatment, so that the flexibility and portability of the active antenna are improved.

Description

Active antenna

Technical Field

The utility model relates to the technical field of active antennas, in particular to an active antenna.

Background

The rod antenna and the loop antenna are two commonly used electromagnetic interference measuring antennas, and are mainly applied to measurement of electric field intensity and magnetic field intensity in a frequency band of 9kHz-30MHz, and because most of the electric field intensity and the magnetic field intensity are near-field conditions when the frequency band of 9kHz-30MHz is used for measurement, the electric field intensity and the magnetic field intensity cannot be calculated and converted according to space wave impedance according to ideal plane wave conditions, and the measurement of the electric field intensity and the magnetic field intensity is needed to be carried out by using the rod antenna and the loop antenna respectively.

In the prior art, two kinds of pole antennas and loop antennas belong to completely independent antenna structures and corresponding active units, the antenna structures and the active units cannot be separated, and under the scene that two kinds of antennas need to be used, the two kinds of antennas need to be carried simultaneously, but because of independent packaging of the two kinds of antennas, the use of the antennas is inflexible and the portability is relatively poor.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide at least an active antenna, which is capable of improving flexibility and portability of the active antenna by performing a module separation process on an antenna structure and an active module.

The utility model mainly comprises the following aspects:

in a first aspect, an embodiment of the present utility model provides an active antenna, where the active antenna includes an antenna structure and an active module, where the antenna structure is connected to the active module.

In one possible embodiment, the antenna structure comprises a rod antenna and a rod antenna passive matching unit.

The rod antenna is connected with the input end of the rod antenna passive matching unit through the rod antenna connecting port, and the output end of the rod antenna passive matching unit is connected with the input end of the active module.

In one possible implementation manner, the rod antenna passive matching unit comprises a transient suppression diode, a first resistor, a first capacitor, a second capacitor and a first radio frequency connector, wherein one end of the transient suppression diode is respectively connected with the rod antenna connection port and one end of the first capacitor, and the other end of the transient suppression diode is respectively connected with one end of the first resistor and one end of the second capacitor and then grounded; the other end of the first capacitor is respectively connected with the other end of the first resistor, the other end of the second capacitor and the inner conductor of the first radio frequency connector; the outer conductor of the first radio frequency connector is grounded, and the inner conductor and the outer conductor of the first radio frequency connector are connected with the input end of the active module.

In one possible embodiment, the antenna structure further comprises a loop antenna and a loop antenna passive matching unit, the loop antenna is connected with an input end of the loop antenna passive matching unit through a loop antenna connection port, and an output end of the loop antenna passive matching unit is connected with an input end of the active module.

In one possible embodiment, the loop antenna passive matching unit comprises a primary loop unit, a balun and a secondary loop unit, wherein the input end of the primary loop unit is connected with the loop antenna connection port, the output end of the primary loop unit is connected with one end of the balun, the other end of the balun is connected with the input end of the secondary loop unit, and the output end of the secondary loop unit is connected with the active module.

In one possible implementation manner, the primary loop unit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third capacitor and a fourth capacitor, wherein one end of the loop antenna connection port is respectively connected with one end of the second resistor, one end of the third resistor and one end of the third capacitor, and the other end of the loop antenna connection port is respectively connected with the other end of the second resistor, one end of the fourth resistor and the other end of the third capacitor; one end of the fourth capacitor is respectively connected with the other end of the third resistor, one end of the fifth resistor and the first connecting end of the balun, and the other end of the fourth capacitor is respectively connected with the other end of the fourth resistor, the other end of the fifth resistor and the second connecting end of the balun.

In one possible implementation manner, the secondary loop unit includes a sixth resistor, a fifth capacitor and a second radio frequency connector, wherein a third connection end of the balun is respectively connected with one end of the sixth resistor, one end of the fifth capacitor and an inner conductor of the second radio frequency connector, a fourth connection end of the balun is respectively connected with the other end of the sixth resistor, the other end of the fifth capacitor and an outer conductor of the second radio frequency connector and then is grounded, and the inner conductor and the outer conductor of the second radio frequency connector are connected with an input end of the active module.

In one possible implementation manner, the active module comprises a signal processing unit, a power supply, an electric quantity detection unit, a third radio frequency connector and a fourth radio frequency connector, wherein the power supply is respectively connected with the signal processing unit and the electric quantity detection unit; the inner conductor of the third radio frequency connector is connected with the inner conductor of the first radio frequency connector in the rod antenna passive matching unit or the inner conductor of the second radio frequency connector in the loop antenna passive matching unit, the outer conductor of the third radio frequency connector is connected with the outer conductor of the first radio frequency connector in the rod antenna passive matching unit or the outer conductor of the second radio frequency connector in the loop antenna passive matching unit, the outer conductor of the third radio frequency connector is grounded, the inner conductor of the third radio frequency connector is connected with the input end of the signal processing unit, the inner conductor of the fourth radio frequency connector is connected with the output end of the signal processing unit, and the outer conductor of the third radio frequency connector, the outer conductor of the fourth radio frequency connector and the signal processing unit are grounded.

In one possible embodiment, the signal processing unit includes a first control switch, a second control switch, a variable attenuator, and a gain unit, wherein a first active end of the first control switch is connected to the inner conductor of the third radio frequency connector, a first terminal of the first control switch is connected to a second terminal of the first control switch, a third terminal of the first control switch is connected to a fourth terminal of the first control switch through the variable attenuator, and a second active end of the first control switch is connected to a first active end of the second control switch; the first wiring end of the second control switch is connected with the second wiring end of the second control switch through the gain unit, the third wiring end of the second control switch is connected with the fourth wiring end of the second control switch, and the second movable end of the second control switch is connected with the inner conductor of the fourth radio frequency connector.

In one possible implementation manner, the electric quantity detection unit comprises a third control switch, a comparison circuit, an inverter, a reference voltage module, a first indicator lamp and a second indicator lamp, wherein one end of the third control switch is connected with the positive electrode of the power supply, the other end of the third control switch is connected with the first input end of the comparison circuit, and the second input end of the comparison circuit is connected with the positive electrode of the reference voltage module; the output end of the comparison circuit is respectively connected with one end of the reverser and one end of the second indicator lamp, and the other end of the reverser is connected with one end of the first indicator lamp; the negative electrode of the power supply is respectively connected with the negative electrode of the reference voltage module, the other end of the first indicator lamp and the other end of the second indicator lamp and then grounded.

The embodiment of the utility model provides an active antenna, which comprises an antenna structure and an active module, wherein the antenna structure is connected with the active module. According to the utility model, the antenna structure and the active module are subjected to module separation treatment, so that the flexibility and portability of the active antenna are improved.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of an active antenna according to an embodiment of the present utility model;

fig. 2 shows a second schematic structural diagram of an active antenna according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of an electric quantity detecting unit according to an embodiment of the present utility model;

fig. 4 shows a third schematic structural diagram of an active antenna according to an embodiment of the present utility model;

fig. 5 shows a schematic structural diagram of an active antenna according to an embodiment of the present utility model;

fig. 6 shows a schematic structural diagram of an active antenna according to an embodiment of the present utility model;

fig. 7 shows a schematic structural diagram of an active antenna according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and it should be understood that the drawings in the present utility model are for the purpose of illustration and description only and are not intended to limit the scope of the present utility model. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present utility model. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.

In addition, the described embodiments are only some, but not all, embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art based on embodiments of the utility model without making any inventive effort, fall within the scope of the utility model.

In the prior art, under the same environment, the rod antenna and the loop antenna are often required to be used for measuring the electric field intensity and the magnetic field intensity respectively, and under the scene that the rod antenna and the loop antenna are required to be used, two antennas are required to be carried simultaneously, but in the prior art, the two antennas are independently packaged, so that the occupied space is large, and the portability is relatively poor.

Based on this, the embodiment of the utility model provides an active antenna, which improves the flexibility and portability of the active antenna by performing module separation processing on an antenna structure and an active module, and specifically comprises the following steps:

referring to fig. 1, fig. 1 shows a schematic structural diagram of an active antenna according to an embodiment of the utility model. As shown in fig. 1, an active antenna provided in an embodiment of the present utility model includes an antenna structure 1, and an active module 2, where the antenna structure 1 is connected with the active module 2.

The active module 2 includes a signal processing unit, a power supply, an electric quantity detection unit, a third radio frequency connector and a fourth radio frequency connector, specifically, the power supply is connected with the signal processing unit and the electric quantity detection unit respectively, an input end of the signal processing unit is further connected with the antenna structure 1 through the third radio frequency connector, and an output end of the signal processing unit is connected with the fourth radio frequency connector.

The fourth radio frequency connector is used as an output interface of the active module 2 and is used for connecting with a spectrometer, a field intensity meter, a receiver or an oscilloscope and other test instruments.

Referring to fig. 2, fig. 2 shows a second schematic structure of an active antenna according to an embodiment of the utility model. As shown in fig. 2, the signal processing unit includes a first control switch K1, a second control switch K2, a variable attenuator 20, a gain unit 21, and a fourth radio frequency connector X4.

In a preferred embodiment, the first active end of the first control switch K1 is connected as an input end of the signal processing unit to the inner conductor of the third radio frequency connector X3, the first terminal of the first control switch K1 is connected to the second terminal of the first control switch K1, the third terminal of the first control switch K1 is connected to the fourth terminal of the first control switch K1 through the variable attenuator 20, and the second active end of the first control switch K1 is connected to the first active end of the second control switch K2.

The first terminal of the second control switch K2 is connected to the second terminal of the second control switch K1 through the gain unit 21, the third terminal of the second control switch K2 is connected to the fourth terminal of the second control switch K2, and the second active terminal of the second control switch K2 is connected to the inner conductor of the fourth radio frequency connector X4 as the output terminal of the signal processing unit.

The outer conductor of the fourth rf connector X4 and the outer conductor of the third rf connector X3 are grounded together with the signal processing unit.

As shown in fig. 2, the power supply 22 is connected with the power detection unit 23 and the signal processing unit respectively, the power detection unit 23 is used for detecting the power of the power supply 22, the power supply 22 supplies power to the signal processing unit, the power supply 22 has an independent battery compartment, the power supply 22 can be detached independently, and the battery monitoring unit can prompt the user that the power of the active antenna is insufficient in time.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an electric quantity detecting unit according to an embodiment of the utility model. As shown in fig. 3, the power detection unit 23 includes a third control switch K3, a comparison circuit 230, an inverter 231, a reference voltage module 232, a first indicator lamp L1, and a second indicator lamp L2.

In a preferred embodiment, as shown in fig. 3, one end of the third control switch K3 is connected to the positive electrode of the power supply 22, the other end of the third control switch K3 is connected to the first input end of the comparison circuit 230, the second input end of the comparison circuit 230 is connected to the positive electrode of the reference voltage module 232, the output end of the comparison circuit 230 is connected to one end of the inverter 231 and one end of the second indicator lamp L2, the other end of the inverter 231 is connected to one end of the first indicator lamp L1, and the negative electrode of the power supply is connected to the negative electrode of the reference voltage module 232, the other end of the first indicator lamp L1, and the other end of the second indicator lamp L2, respectively, and then grounded.

Specifically, when the voltage at the first input end of the comparison circuit 230 is greater than the voltage corresponding to the reference voltage module 232, the comparison circuit 230 outputs a high level, at this time, the second indicator lamp L2 is turned on to emit light under the action of the high level, the first indicator lamp L1 is turned off to emit no light under the action of the inverter 231, that is, the second indicator lamp L2 emits light to indicate sufficient electric quantity, when the voltage at the first input end of the comparison circuit 230 is less than the voltage corresponding to the reference voltage module 232, the comparison circuit 230 outputs a low level, at this time, the second indicator lamp L2 is turned off to emit light, the first indicator lamp L1 is turned on to emit light, at this time, the electric quantity is insufficient, and the voltage of the reference voltage module 232 can be set according to practical situations.

In a preferred embodiment, referring to fig. 4, fig. 4 shows a schematic structure diagram of an active antenna according to an embodiment of the present utility model. As shown in fig. 4, the antenna structure 1 includes a rod antenna 10 and a rod antenna passive matching unit 11.

Preferably, the rod antenna 10 is connected to the input end of the rod antenna passive matching unit 11 through the rod antenna connection port 12, and the output end of the rod antenna passive matching unit 11 is connected to the input end of the active module 2, wherein the rod antenna 10 is generally in a threaded screw structure.

Referring to fig. 5, fig. 5 shows a schematic structural diagram of an active antenna according to an embodiment of the present utility model. As shown in fig. 5, the rod antenna passive matching unit 11 includes a transient suppression diode TVS, a first resistor R1, a first capacitor C1, a second capacitor C2, and a first radio frequency connector X1.

In a preferred embodiment, one end of the TVS is connected to the rod antenna connection port 12 and one end of the first capacitor C1, and the other end of the TVS is connected to one end of the first resistor R1 and one end of the second capacitor C2, respectively, and then grounded.

The other end of the first capacitor C1 is respectively connected with the other end of the first resistor R1, the other end of the second capacitor C2 and the inner conductor of the first radio frequency connector XP 1.

The outer conductor of the first rf connector X1 is grounded, and the inner conductor and the outer conductor of the first rf connector X1 are connected to the input terminal of the active module 2.

In the application scenario of the rod antenna, the inner conductor of the third radio frequency connector X3 is connected with the inner conductor of the first radio frequency connector X1 in the rod antenna passive matching unit 11, and the outer conductor of the third radio frequency connector X3 is connected with the outer conductor of the first radio frequency connector X1 in the rod antenna passive matching unit 11, so that the connection of the rod antenna, the rod antenna passive matching unit and the active module 2 is realized, so as to be used for measuring the electric field intensity in the field.

Specifically, the rod antenna 10 of the present utility model is configured to receive an electric field signal in a test field and transmit the electric field signal to the rod antenna passive matching unit 11, where the rod antenna passive matching unit 11 performs amplitude-frequency response processing on the received electric field signal to obtain a voltage signal meeting a flatness requirement in a test frequency band, as shown in fig. 5, the transient suppression diode TVS plays a role in protecting against static electricity and other damage to a circuit function, the first capacitor C1 is a coupling capacitor, and mainly for isolating low frequency and direct current interference, the first resistor R1 and the second capacitor C2 implement matching of the electric field signal received by the rod antenna and an adjusting function of signal strength.

Referring to fig. 6, fig. 6 shows a schematic structure diagram of an active antenna according to an embodiment of the utility model. As shown in fig. 6, the antenna structure 1 further comprises a loop antenna 13 and a loop antenna passive matching unit 14.

The loop antenna 13 is connected with an input end of the loop antenna passive matching unit 14 through a loop antenna connection port 15, and an output end of the loop antenna passive matching unit 14 is connected with an input end of the active module 2.

Specifically, the loop antenna passive matching unit 14 includes a primary loop unit, a balun and a secondary loop unit, where an input end of the primary loop unit is connected to the loop antenna connection port 15, an output end of the primary loop unit is connected to one end of the balun, the other end of the balun is connected to an input end of the secondary loop unit, and an output end of the secondary loop unit is connected to the active module 2.

Referring to fig. 7, fig. 7 shows a schematic structural diagram of an active antenna according to an embodiment of the utility model. As shown in fig. 7, the primary loop unit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, and a fourth capacitor C4.

In a preferred embodiment, one end of the loop antenna connection port 15 is connected to one end of the second resistor R2, one end of the third resistor R3, and one end of the third capacitor C3, respectively, and the other end of the loop antenna connection port 15 is connected to the other end of the second resistor R2, one end of the fourth resistor R4, and the other end of the third capacitor C3, respectively.

One end of a fourth capacitor R4 is respectively connected with the other end of the third resistor R3, one end of the fifth resistor R5 and the first connecting end of the balun, and the other end of the fourth capacitor C4 is respectively connected with the other end of the fourth resistor R4, the other end of the fifth resistor R5 and the second connecting end of the balun.

The secondary loop unit includes a sixth resistor R6, a fifth capacitor C5, and a second rf connector X2.

Preferably, the third connection end of balun is connected with one end of the sixth resistor R6, one end of the fifth capacitor C5 and the inner conductor of the second radio frequency connector X2 respectively, and the fourth connection end of balun is connected with the other end of the sixth resistor R6, the other end of the fifth capacitor C5 and the ground respectively, and then connected to the ground after being connected with the outer conductor of the second radio frequency connector X2.

The inner conductor and the outer conductor of the second radio frequency connector X2 are respectively connected with the input end of the active module 2, specifically, in the application scene of the loop antenna, the inner conductor of the third radio frequency connector X3 is connected with the inner conductor of the second radio frequency connector X2 in the loop antenna passive matching unit, and the outer conductor of the third radio frequency connector X3 is connected with the outer conductor of the second radio frequency connector X2 in the loop antenna passive matching unit, so that the connection of the loop antenna, the loop antenna passive matching unit and the active module 2 is realized, and the magnetic field intensity in a field is measured.

Specifically, the loop antenna 13 of the present utility model is configured to receive a magnetic field signal in a test field and transmit the magnetic field signal to the loop antenna passive matching unit 14, where the loop antenna passive matching unit 14 performs amplitude-frequency response processing on the received magnetic field signal to obtain a voltage signal meeting a flatness requirement in a test frequency band, as shown in fig. 7, the third resistor R3 and the fourth resistor R4 implement adjustment of internal resistance of the loop antenna, so that the loop antenna becomes a resistive loaded traveling wave antenna, the second resistor R2, the fifth resistor R4, the third capacitor C3 and the fourth capacitor C4 implement adjustment of amplitude-frequency response flatness of the loop antenna, balun implements conversion between balance and imbalance of the loop antenna, and the sixth resistor R6 and the fifth capacitor C5 implement matching and fine tuning of the balanced and converted voltage signal.

In the utility model, the rod antenna 10 and the rod antenna passive matching unit 11 can be freely disassembled through the rod antenna connecting port 12, and the rod antenna passive matching unit 11 and the active module 2 can be freely disassembled through the first radio frequency connector X1 and the third radio frequency connector X3.

Similarly, the loop antenna 13 and the loop antenna passive matching unit 14 can be freely detached through the loop antenna connection port 15, and the loop antenna passive matching unit 14 and the active module 2 can be freely detached through the second radio frequency connector X2 and the third radio frequency connector X3.

In summary, the active module 2 can be freely connected to the rod antenna or the loop antenna, as shown in fig. 2, the gain unit 21 of the active module 2 can skip, i.e. shield the gain function of the active module 2 to the signal, through the second control switch K2, and the variable attenuator 20, so that the connected rod antenna or loop antenna can work under different ranges.

Specifically, the first terminal and the second terminal of the first control switch are in a conducting state by default, the third terminal and the fourth terminal of the first control switch are in a disconnecting state by default, the first terminal and the second terminal of the second control switch are in a conducting state by default, the third terminal and the fourth terminal of the second control switch are in a disconnecting state by default, and the active module 2 is in a receiving state, is in a processing state of a received electric signal, and mainly performs gain amplification on the received electric signal.

When the active module 2 is in the receiving state, the first terminal and the second terminal of the first control switch can be selectively controlled to be in the off state in case of need, the third terminal and the fourth terminal of the first control switch are in the on state by default, and the range of the accessed rod antenna or loop antenna is expanded through the variable attenuator 20.

In another case, the first terminal and the second terminal of the first control switch are controlled to be in an on state, the third terminal and the fourth terminal of the first control switch are controlled to be in an off state by default, the first terminal and the second terminal of the second control switch are controlled to be in an off state, the third terminal and the fourth terminal of the second control switch are controlled to be in an on state, and at this time, the active module 2 is in a transmitting state to convert a receiving function of the rod antenna or the loop antenna into a transmitting function.

The rod antenna is connected with the active module through the first radio frequency connector in the rod antenna passive matching unit and the third radio frequency connector in the active module, or the loop antenna is connected with the active module through the second radio frequency connector in the loop antenna passive matching unit and the third radio frequency connector in the active module.

In summary, the utility model has the advantages that:

1. by adopting the separated modularized technical scheme, the active module and the pole antenna can be flexibly switched, and portability and maintainability are improved.

2. The antenna structure and the active module are separated and installed in a modularized mode, the active module can be used for realizing the public use of multiple antennas, the loop antenna and the rod antenna can be simultaneously loaded in one portable case, and the volume during transportation is reduced.

3. The active module is of a general design, so that the active module can realize quick replacement, the use time of an antenna active mode can be prolonged, or a plurality of standby active modules are carried, the quick replacement is realized when the active module breaks down, and the use reliability of the active antenna is improved.

4. The independent battery compartment in the active module is designed, so that the battery can be quickly replaced, the service time is prolonged, the function of reminding insufficient electric quantity can be achieved, a user can be prompted to replace the battery in time to supplement the electric quantity, and the false test result of under-voltage of the battery is avoided.

5. Because of the separable characteristics of the antenna structure and the active module, when the antenna is in fault investigation, fault points can be rapidly positioned only by simply replacing or independently testing port characteristics of all parts, the speed of positioning maintenance problems is improved, and the problematic parts can be independently mailed during maintenance without integral mailing, so that the transportation cost is reduced.

6. The shared active module can reduce the purchase cost of simultaneously purchasing two antennas.

7. Because the active gain of the active module can be skipped through an internal switch, the accessed antenna can be changed into a transmitting antenna through a variable attenuator in some scenes, and the application range of the accessed antenna is expanded.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. An active antenna, characterized in that the active antenna comprises an antenna structure and an active module,

wherein the antenna structure is connected with the active module;

the antenna structure comprises a rod antenna and a rod antenna passive matching unit,

the rod antenna is connected with the input end of the rod antenna passive matching unit through a rod antenna connecting port, and the output end of the rod antenna passive matching unit is connected with the input end of the active module.

2. The active antenna of claim 1, wherein the rod antenna passive matching unit comprises a transient suppression diode, a first resistor, a first capacitor, a second capacitor, and a first radio frequency connector,

one end of the transient suppression diode is respectively connected with the rod antenna connection port and one end of the first capacitor, and the other end of the transient suppression diode is respectively connected with one end of the first resistor and one end of the second capacitor and then grounded;

the other end of the first capacitor is respectively connected with the other end of the first resistor, the other end of the second capacitor and the inner conductor of the first radio frequency connector;

the outer conductor of the first radio frequency connector is grounded, and the inner conductor and the outer conductor of the first radio frequency connector are connected with the input end of the active module.

3. The active antenna of claim 1, wherein the antenna structure further comprises a loop antenna and a loop antenna passive matching element,

the loop antenna is connected with the input end of the loop antenna passive matching unit through a loop antenna connecting port, and the output end of the loop antenna passive matching unit is connected with the input end of the active module.

4. An active antenna according to claim 3, wherein said loop antenna passive matching unit comprises a primary loop unit, a balun and a secondary loop unit,

the input end of the primary loop unit is connected with the loop antenna connection port, the output end of the primary loop unit is connected with one end of the balun, the other end of the balun is connected with the input end of the secondary loop unit, and the output end of the secondary loop unit is connected with the active module.

5. The active antenna of claim 4, wherein the primary loop element comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third capacitor, and a fourth capacitor,

one end of the loop antenna connection port is respectively connected with one end of the second resistor, one end of the third resistor and one end of the third capacitor, and the other end of the loop antenna connection port is respectively connected with the other end of the second resistor, one end of the fourth resistor and the other end of the third capacitor;

one end of the fourth capacitor is connected with the other end of the third resistor, one end of the fifth resistor and the first connecting end of the balun respectively, and the other end of the fourth capacitor is connected with the other end of the fourth resistor, the other end of the fifth resistor and the second connecting end of the balun respectively.

6. The active antenna of claim 5, wherein the secondary loop element comprises a sixth resistor, a fifth capacitor, and a second radio frequency connector,

the third connecting end of the balun is respectively connected with one end of the sixth resistor, one end of the fifth capacitor and an inner conductor of the second radio frequency connector, the fourth connecting end of the balun is respectively grounded with the other end of the sixth resistor and the other end of the fifth capacitor, and an outer conductor of the second radio frequency connector is grounded;

the inner conductor and the outer conductor of the second radio frequency connector are connected with the input end of the active module.

7. The active antenna of any one of claims 1 to 6, wherein the active module comprises a signal processing unit, a power supply, a power detection unit, a third radio frequency connector and a fourth radio frequency connector,

the power supply is respectively connected with the signal processing unit and the electric quantity detection unit;

the inner conductor of the third radio frequency connector is connected with the inner conductor of the first radio frequency connector in the pole antenna passive matching unit or the inner conductor of the second radio frequency connector in the loop antenna passive matching unit, the outer conductor of the third radio frequency connector is connected with the outer conductor of the first radio frequency connector in the pole antenna passive matching unit or the outer conductor of the second radio frequency connector in the loop antenna passive matching unit, and the outer conductor of the third radio frequency connector is grounded;

the inner conductor of the third radio frequency connector is connected with the input end of the signal processing unit, the inner conductor of the fourth radio frequency connector is connected with the output end of the signal processing unit, and the outer conductor of the third radio frequency connector, the outer conductor of the fourth radio frequency connector and the signal processing unit are grounded together.

8. The active antenna of claim 7, wherein the signal processing unit comprises a first control switch, a second control switch, a variable attenuator, and a gain unit,

the first movable end of the first control switch is connected with the inner conductor of the third radio frequency connector, the first wiring end of the first control switch is connected with the second wiring end of the first control switch, the third wiring end of the first control switch is connected with the fourth wiring end of the first control switch through the variable attenuator, and the second movable end of the first control switch is connected with the first movable end of the second control switch;

the first wiring terminal of the second control switch is connected with the second wiring terminal of the second control switch through the gain unit, the third wiring terminal of the second control switch is connected with the fourth wiring terminal of the second control switch, the second movable terminal of the second control switch is connected with the inner conductor of the fourth radio frequency connector, and the outer conductor of the fourth radio frequency connector is grounded.

9. The active antenna of claim 8, wherein the power detection unit comprises a third control switch, a comparison circuit, an inverter, a reference voltage module, a first indicator light, and a second indicator light,

one end of the third control switch is connected with the positive electrode of the power supply, the other end of the third control switch is connected with the first input end of the comparison circuit, and the second input end of the comparison circuit is connected with the positive electrode of the reference voltage module;

the output end of the comparison circuit is respectively connected with one end of the reverser and one end of the second indicator lamp, and the other end of the reverser is connected with one end of the first indicator lamp;

the negative electrode of the power supply is respectively connected with the negative electrode of the reference voltage module, the other end of the first indicator lamp and the other end of the second indicator lamp and then grounded.