An antenna device for stealth of unmanned aerial vehicle and its working method

Abstract

The present invention belongs to the field of antenna technology, and specifically relates to an antenna device for stealth use in unmanned aerial vehicles (UAVs) and an operating method thereof. The antenna device for stealth use in UAVs comprises: a control module, a plasma generation module, a power supply module, a high-frequency electromagnetic wave coupling module, and a plasma monitoring module. The present invention can achieve a radar cross-sectional area close to zero, and can also form a plasma to conduct high-frequency current oscillations to achieve electromagnetic wave radiation and reception. By changing the plasma concentration, the antenna operating frequency band can be adjusted and selected. The characteristic of high-frequency detection radar signals penetrating the plasma antenna with low loss is utilized to reduce the antenna's radar cross-sectional area in the high frequency band and improve the antenna's stealth performance. At the same time, the optimal output voltage of the power supply module can be determined through a feedback signal, thereby achieving both efficient coupling of microwave signals to the plasma for radiation and low-loss penetration of detection radar signals through the plasma.

Description

Technical Field

[0001] The present invention belongs to the field of antenna technology, and in particular relates to an antenna device for stealth of an unmanned aerial vehicle and a working method thereof. Background Art

[0002] The premise of all anti-drone technologies is to detect drones using radar or optical means. In order to reduce the probability of drones being discovered, the current method of improving drone stealth performance uses black coatings to reduce the optical reflection cross-section and organic polymer materials to reduce the scattering cross-section of radar electromagnetic waves.

[0003] However, since drones need to communicate with the rear control center or receive navigation signals for positioning, antennas need to be installed on the drones. Traditional antennas are made of metal materials, which have a large scattering cross-sectional area. While the antennas complete the functions of transmitting and receiving electromagnetic waves, they also bring the problem of difficulty in stealth. Metal antennas reduce the stealth performance of drones, making them easy to be detected by detection radars.

[0004] However, current stealth antenna methods and technologies fall into two main categories. The first involves antenna designs using materials with electromagnetic wave frequency selectivity. These antennas utilize materials or structures with specific electromagnetic spectrum selectivity, selectively allowing electromagnetic waves of a certain frequency to enter the antenna channel while absorbing or reflecting waves of other frequencies. While these antennas offer good stealth capabilities for specific electromagnetic wave frequency bands, their stealth capabilities are weak across a wider range of electromagnetic wave bands. Furthermore, the composition of these frequency-selective surfaces is complex and difficult to manufacture. The second category involves semiconductor devices, which utilize their semiconductor properties. When a certain voltage is applied, the semiconductor device conducts current, radiating electromagnetic waves. When the voltage is removed, the semiconductor device turns off, interrupting the conduction current and terminating electromagnetic wave radiation. These antennas utilize PIN diodes, which are very small, resulting in a small equivalent electrical size. These diodes are well-suited for high-frequency electromagnetic wave radiation. However, their electromagnetic radiation capability is poor in the S / C bands commonly used by drones, making them unsuitable for use in these bands.

[0005] Therefore, there is an urgent need to develop a new stealth antenna device for unmanned aerial vehicles and a working method thereof to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an antenna device for stealth of a UAV and a working method thereof, so as to solve the problem of how to reduce the scattering cross-sectional area of ​​the UAV.

[0007] In order to solve the above technical problems, the present invention provides an antenna device for stealth of an unmanned aerial vehicle, which includes: a control module, a plasma generation module, a power supply module, a high-frequency electromagnetic wave coupling module and a plasma monitoring module; wherein the power supply module, the high-frequency electromagnetic wave coupling module and the plasma monitoring module are electrically connected to the control module; the power supply module is electrically connected to the plasma generation module, the high-frequency electromagnetic wave coupling module is nested on the plasma generation module, and the plasma monitoring module is connected to the plasma generation module; when the power supply module supplies power to the plasma generation module, the plasma generation module generates plasma therein, and the high-frequency electromagnetic wave coupling module couples a microwave signal into the plasma in the plasma generation module for spatial radiation; the control module detects the microwave signal input state and the plasma concentration through the high-frequency electromagnetic wave coupling module and the plasma monitoring module, respectively, so that the control module controls the plasma generation module through the power supply module to adjust the plasma concentration.

[0008] Specifically, the plasma generation module includes: at least one sealed tube; an inert gas is sealed in the sealed tube, and corresponding metal electrodes are respectively provided on both sides of the sealed tube, each of the metal electrodes extends into the sealed tube, and each of the metal electrodes is electrically connected to a power supply module; when the power supply module supplies power to each metal electrode, each metal electrode ionizes the inert gas in the sealed tube to form plasma.

[0009] Specifically, when at least two sections of the sealing tubes are provided, the sealing tubes are sequentially connected via corresponding coupling microwave connectors.

[0010] Specifically, the power supply module includes: a DC power supply; the DC power supply is electrically connected to the control module, and the DC power supply is electrically connected to each sealed tube respectively; when the DC power supply supplies power to each sealed tube respectively, the sealed tube generates plasma therein; the control module controls each sealed tube through the DC power supply to adjust the plasma concentration.

[0011] Specifically, the high-frequency electromagnetic wave coupling module includes: a magnetic ring, a microwave signal input port, and a microwave signal reflection port; the magnetic ring is nested on any of the sealed tubes, and the magnetic ring is electrically connected to the microwave signal input port and the microwave signal reflection port, respectively; the microwave signal input port is electrically connected to a microwave signal generator, and the microwave signal reflection port is electrically connected to a control module; the microwave signal input port receives a microwave signal emitted by the microwave signal generator, and the microwave signal is spatially radiated through the plasma in the sealed tube coupled by the magnetic ring; the control module obtains the matching status of the microwave signal input port through the microwave signal reflection port.

[0012] Specifically, when the acquired reflection data at the microwave signal input port exceeds a first set value, the control module controls the power supply module to increase the power supply voltage to the sealed tube.

[0013] Specifically, the magnetic ring is nested in the center of the sealing tube.

[0014] Specifically, the probe of the plasma monitoring module is placed in a sealed tube to detect the plasma concentration in the sealed tube.

[0015] Specifically, the characteristic frequency point of the lossless penetrating plasma is obtained through the plasma concentration in the sealed tube, and when the characteristic frequency point is higher than the working frequency band of the detection radar, the control module controls the power supply module to reduce the power supply voltage to the sealed tube.

[0016] On the other hand, the present invention provides a working method using the above-mentioned drone stealth antenna device, which includes: supplying power to a plasma generation module through a power supply module so that the plasma generation module generates plasma therein, and a high-frequency electromagnetic wave coupling module coupling a microwave signal into the plasma in the plasma generation module for spatial radiation; and a control module detecting the microwave signal input state and plasma concentration through the high-frequency electromagnetic wave coupling module and the plasma monitoring module, respectively, so that the control module controls the plasma generation module through the power supply module to adjust the plasma concentration.

[0017] The beneficial effects of the present invention are as follows: the present invention realizes a radar cross-sectional area close to zero by utilizing the insulation characteristics of the plasma generation module when power is not supplied; the plasma generation module forms plasma when power is supplied to conduct high-frequency current oscillations to realize electromagnetic wave radiation and reception; and the control module cooperates with the power supply module to enable the plasma generation module to change the plasma concentration, thereby realizing adjustment and selection of the antenna operating frequency band, and utilizing the characteristics of the high-frequency band detection radar signal penetrating the plasma antenna with low loss, thereby reducing the radar cross-sectional area of ​​the antenna in the high-frequency band and improving the stealth performance of the antenna; at the same time, the feedback signals of the high-frequency electromagnetic wave coupling module and the plasma monitoring module can determine the optimal output voltage of the power supply module, thereby realizing efficient coupling of microwave signals to the plasma for radiation, and realizing low-loss penetration of the detection signal of the detection radar through the plasma.

[0018] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of the stealth antenna device for a drone of the present invention;

[0022] Figure 2 This is a principle block diagram of the stealth antenna device for UAV of the present invention;

[0023] Figure 3 This is a workflow diagram of the drone stealth antenna device of the present invention.

[0024] In the picture:

[0025] 1. Control module;

[0026] 2. Plasma generation module; 201. Sealed tube; 202. Metal electrode; 203. Coupled microwave connector;

[0027] 3. Power supply module; 301. DC power supply;

[0028] 4. High-frequency electromagnetic wave coupling module; 401. Magnetic ring; 402. Microwave signal input port; 403. Microwave signal reflection port;

[0029] 5. Plasma monitoring module. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In some embodiments, a stealth antenna device for a drone is provided, such as Figures 1 to 3As shown, the antenna device for stealth of unmanned aerial vehicles includes: a control module 1, a plasma generating module 2, a power supply module 3, a high-frequency electromagnetic wave coupling module 4 and a plasma monitoring module 5; wherein the power supply module 3, the high-frequency electromagnetic wave coupling module 4, and the plasma monitoring module 5 are electrically connected to the control module 1; the power supply module 3 is electrically connected to the plasma generating module 2, the high-frequency electromagnetic wave coupling module 4 is nested on the plasma generating module 2, and the plasma monitoring module 5 is connected to the plasma generating module 2; when the power supply module 3 supplies power to the plasma generating module 2, the plasma generating module 2 generates plasma therein, and the high-frequency electromagnetic wave coupling module 4 couples the microwave signal into the plasma in the plasma generating module 2 for spatial radiation; the control module 1 detects the microwave signal input state and the plasma concentration through the high-frequency electromagnetic wave coupling module 4 and the plasma monitoring module 5, respectively, so that the control module 1 controls the plasma generating module 2 to adjust the plasma concentration through the power supply module 3.

[0032] In some embodiments, the radar cross-sectional area is close to zero through the insulation characteristics of the plasma generating module 2 when it is not powered on. When powered on, the plasma generating module 2 forms a plasma to conduct high-frequency current oscillations to achieve electromagnetic wave radiation and reception. In addition, the control module 1 cooperates with the power supply module 3 to enable the plasma generating module 2 to change the plasma concentration, thereby adjusting and selecting the antenna operating frequency band. The high-frequency band detection radar signal penetrates the plasma antenna with low loss, thereby reducing the radar cross-sectional area of ​​the antenna in the high-frequency band and improving the stealth performance of the antenna. At the same time, the feedback signals of the high-frequency electromagnetic wave coupling module 4 and the plasma monitoring module 5 can determine the optimal output voltage of the power supply module 3, thereby achieving efficient coupling of microwave signals to the plasma for radiation and low-loss penetration of the detection radar signal through the plasma.

[0033] In at least one embodiment, the plasma generating module 2 includes: at least one sealed tube 201; an inert gas is sealed in the sealed tube 201, and corresponding metal electrodes 202 are respectively provided on both sides of the sealed tube 201, each of the metal electrodes 202 extends into the sealed tube 201, and each of the metal electrodes 202 is electrically connected to the power supply module 3; when the power supply module 3 supplies power to each metal electrode 202, each metal electrode 202 ionizes the inert gas in the sealed tube 201 to form plasma.

[0034] Specifically, the sealing tube 201 is made of glass or polymer material, and is in the shape of a long rod or arranged in a central radial shape.

[0035] In at least one embodiment, when at least two sections of the sealing tubes 201 are provided, the sealing tubes 201 are sequentially connected via corresponding coupling microwave connectors 203 .

[0036] Specifically, each section of the sealed tube 201 is independently provided, and the length of each section of the sealed tube 201 varies to a certain extent. Inert gas is encapsulated in each section of the sealed tube 201 to facilitate breakdown to form plasma.

[0037] Specifically, the multi-section sealed tube 201 can achieve different antenna gain or directional pattern changes and the selection and conversion of electromagnetic wave radiation in different frequency bands.

[0038] Specifically, after voltage is applied to the two metal electrodes 202 of the sealed tube 201, plasma can be directly ionized, and the concentration of the plasma can be dynamically adjusted by adjusting the excitation voltage. When no voltage is applied to the sealed tube 201, the sealed tube 201 is in a gas state and has no effect on electromagnetic waves. The electromagnetic waves can penetrate the sealed tube 201 without damage.

[0039] Specifically, the coupled microwave connector 203 can only transmit microwave signals but cannot transmit excitation voltage. The excitation voltage can only be loaded into the sealed tube 201 where the metal electrodes 202 are located through the metal electrodes 202 on both sides of the sealed tube 201 .

[0040] In at least one embodiment, the power supply module 3 includes: a DC power supply 301; the DC power supply 301 is electrically connected to the control module 1, and the DC power supply 301 is electrically connected to each sealed tube 201 respectively; when the DC power supply 301 supplies power to each sealed tube 201 respectively, the sealed tube 201 generates plasma therein; the control module 1 controls each sealed tube 201 through the DC power supply 301 to adjust the plasma concentration.

[0041] Specifically, the DC power supply 301 is used to generate an excitation voltage, which is applied to the two metal electrodes 202 of the sealed tube 201 through wires, thereby ionizing the low-pressure inert gas in the sealed tube 201 to form plasmas of different concentrations.

[0042] Specifically, the DC power supply 301 provides voltages of different strengths to each sealed tube 201 to achieve antenna operating frequency band adjustment and radiation pattern reconstruction.

[0043] In at least one embodiment, the high-frequency electromagnetic wave coupling module 4 includes: a magnetic ring 401, a microwave signal input port 402, and a microwave signal reflection port 403; the magnetic ring 401 is nested on any of the sealed tubes 201, and the magnetic ring 401 is electrically connected to the microwave signal input port 402 and the microwave signal reflection port 403 respectively; the microwave signal input port 402 is electrically connected to the microwave signal generator, and the microwave signal reflection port 403 is electrically connected to the control module 1; the microwave signal input port 402 receives the microwave signal emitted by the microwave signal generator, and the microwave signal is coupled to the plasma in the sealed tube 201 through the magnetic ring 401 for spatial radiation; the control module 1 obtains the matching status of the microwave signal input port 402 through the microwave signal reflection port 403.

[0044] Specifically, the microwave signal input port 402 and the microwave signal reflection port 403 are connected to two coaxial microwave connectors (preferably SMA or K-type microwave connectors), wherein the microwave signal reflection port 403 is used to monitor the matching condition of the microwave signal input port 402 .

[0045] Specifically, the microwave signal is efficiently coupled into the plasma through the magnetic ring 401 , so that the microwave signal is radiated through the plasma.

[0046] Specifically, the magnetic ring 401 couples the microwave signal to the excited plasma in a magnetic coupling manner for spatial radiation, without affecting the concentration and distribution of the plasma.

[0047] In at least one embodiment, when the acquired reflection data at the microwave signal input port 402 exceeds a first set value, the control module 1 controls the power supply module 3 to increase the power supply voltage to the sealing tube 201 .

[0048] Specifically, the control module 1 monitors the matching state of the microwave signal input port 402. When the reflection of the microwave signal input port 402 is too large, the control module 1 outputs a feedback signal to the DC power supply 301, increases the output voltage of the DC power supply 301, improves the conductivity of the plasma in its operating frequency band, improves the matching state of the microwave signal input port 402, and enables the fed microwave signal to be efficiently coupled to the plasma for spatial radiation.

[0049] In at least one embodiment, the magnetic ring 401 is nested in the center of the sealing tube 201 .

[0050] In at least one embodiment, the probe of the plasma monitoring module 5 is placed in the sealed tube 201 to detect the plasma concentration in the sealed tube 201 .

[0051] In at least one embodiment, the characteristic frequency point of the lossless penetrating plasma is obtained by the plasma concentration in the sealed tube 201, and when the characteristic frequency point is higher than the working frequency band of the detection radar, the control module 1 controls the power supply module 3 to reduce the power supply voltage to the sealed tube 201.

[0052] Specifically, the plasma monitoring module 5 is used to monitor the concentration of the plasma and calculate the characteristic frequency point of lossless penetration of the plasma. When the characteristic frequency point is higher than the operating frequency band of the detection radar, it outputs a feedback signal to the control module 1, reduces the output voltage of the DC power supply 301, reduces the concentration of the plasma, and reduces the conductivity of the plasma in the operating frequency band of the detection radar, so that the detection signal of the detection radar penetrates the plasma without loss, achieving a radar scattering cross-section close to zero.

[0053] Specifically, the control module 1 makes a comprehensive judgment based on the matching status of the microwave signal input port 402 and the feedback signal of the plasma monitoring module 5 to determine the optimal output voltage of the DC power supply 301, so as to achieve both efficient coupling of the microwave signal to the plasma for radiation and low-loss penetration of the detection signal of the detection radar through the plasma.

[0054] In some embodiments, a method for operating a stealth antenna device for a drone is provided, comprising: supplying power to a plasma generating module 2 via a power supply module 3 so that the plasma generating module 2 generates plasma therein, and coupling a microwave signal into the plasma in the plasma generating module 2 via a high-frequency electromagnetic wave coupling module 4 for spatial radiation; and detecting the microwave signal input state and plasma concentration via the high-frequency electromagnetic wave coupling module 4 and the plasma monitoring module 5, respectively, so that the control module 1 controls the plasma generating module 2 to adjust the plasma concentration via the power supply module 3.

[0055] In some embodiments, a flight method is also provided, which includes: when the drone is ready to take off, according to the working electromagnetic wave frequency band of the drone, selecting the voltage output of different output ends of the DC power supply 301, lighting the sealed tube 201 with a specific structure, forming a gas plasma antenna, realizing the electromagnetic wave transceiver function of the specific frequency band, using the gas plasma antenna to realize communication with the drone ground control center, receiving control instructions from the drone ground control center, and executing preset related tasks; the drone takes off and enters a stable flight state, temporarily no longer needs to communicate with the control center, completely cuts off the DC voltage at both ends of the sealed tube 201, and the gas in the airbag returns to normal state, no longer has It has conductive properties, the radar scattering cross-section is approximately zero, and the antenna enters a stealth state; when the UAV has penetrated to a very close distance to the target, the effect of the radar has been greatly weakened. According to the mission plan, the radiation / reception performance of the entire gas plasma antenna can be restored intermittently to realize the target reconnaissance image feedback and receive instructions from the flight control center; during the UAV's takeoff, penetration and approach to the target, the high-frequency electromagnetic wave coupling module 4 needs to work closely with the DC power supply 301 to realize the switching of the gas plasma antenna system's transceiver function or stealth state (the sealed gas is not excited to become a plasma state) under the unified scheduling of the UAV's own control system.

[0056] In summary, the present invention realizes that the radar cross-sectional area of ​​the radar is close to zero through the insulation characteristics of the plasma generation module when it is not powered on. When powered on, the plasma generation module forms a plasma to conduct high-frequency current oscillations to achieve electromagnetic wave radiation and reception. The control module cooperates with the power supply module to enable the plasma generation module to change the plasma concentration to achieve antenna operating frequency band adjustment and selection. The characteristic of the high-frequency band detection radar signal penetrating the plasma antenna with low loss is utilized to reduce the radar cross-sectional area of ​​the antenna in the high-frequency band and improve the stealth performance of the antenna. At the same time, the feedback signal of the high-frequency electromagnetic wave coupling module and the plasma monitoring module can determine the optimal output voltage of the power supply module, thereby achieving efficient coupling of microwave signals to the plasma for radiation and achieving low-loss penetration of the detection signal of the detection radar through the plasma. The multi-section sealed tube is used, and each section of the sealed tube is independently fed and excited, which can easily form plasmas of different step concentrations to achieve adjustment and reconstruction of the antenna operating frequency band. The plasmas of different step concentrations formed have different radiation capabilities, which can easily achieve antenna radiation pattern adjustment and Reconstruction; an independent DC voltage power supply is used to excite the gas into plasma, which is independent of the microwave signal feeding port, effectively avoiding the mutual influence of the DC power supply and microwaves, and improving the reliability and stability of the antenna; a magnetic coupling method of magnetic ring loading microwaves is used to cleverly and efficiently couple microwaves to the plasma with high magnetic permeability, greatly improving the coupling efficiency of microwaves. At the same time, compared with capacitive coupling and direct coupling, the magnetic coupling method is simpler and more convenient in structure, not restricted by the coupling position, and effectively improving the flexibility of feeding; a plasma monitoring module and a control module are used to dynamically monitor the high-frequency plasma state and the low-frequency magnetic coupling port matching, which can not only achieve efficient coupling of microwave signals to the plasma for space radiation, but also achieve low-loss penetration of the detection radar's detection signal through the plasma, reducing the high-frequency scattering cross-sectional area of ​​the antenna; by adjusting the DC supply voltage, and thus changing the plasma concentration, it has stronger stealth capability and a simpler structure than frequency selective surface antennas; compared with semiconductor stealth antennas, it has a wider frequency adjustment range and higher antenna gain.

[0057] All components used in this application (parts whose specific structures are not described) are standard components or components known to those skilled in the art. Their structures and principles are readily known to those skilled in the art through technical manuals or routine experimental methods. Furthermore, the software programs referred to in this application are all prior art, and this application does not involve any improvements to the software programs.

[0058] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0061] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0062] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. An antenna device for stealth drone, characterized in that: include: Control module, plasma generation module, power supply module, high-frequency electromagnetic wave coupling module and plasma monitoring module; in The power supply module, high-frequency electromagnetic wave coupling module, plasma monitoring module and control module are electrically connected; The power supply module is electrically connected to the plasma generation module; The high-frequency electromagnetic wave coupling module includes: a magnetic ring, a microwave signal input port, and a microwave signal reflection port; The magnetic ring is nested on the plasma generation module, and the magnetic ring is electrically connected to the microwave signal input port and the microwave signal reflection port respectively. The microwave signal input port is electrically connected to the microwave signal generator, and the microwave signal reflection port is electrically connected to the control module. The plasma monitoring module is connected to the plasma generation module; When the power supply module supplies power to the plasma generating module, the plasma generating module generates plasma therein, and the high-frequency electromagnetic wave coupling module couples the microwave signal into the plasma in the plasma generating module for spatial radiation; The control module detects the microwave signal input state and the plasma concentration respectively through the high-frequency electromagnetic wave coupling module and the plasma monitoring module, so that the control module controls the plasma generation module to adjust the plasma concentration through the power supply module.

2. The drone stealth antenna device according to claim 1, wherein: The plasma generation module includes: at least one sealed tube; Inert gas is sealed in the sealed tube, and corresponding metal electrodes are respectively provided on both sides of the sealed tube, each of the metal electrodes extends into the sealed tube, and each of the metal electrodes is electrically connected to the power supply module; When the power supply module supplies power to each metal electrode, each metal electrode ionizes the inert gas in the sealed tube to form plasma.

3. The drone stealth antenna device according to claim 2, wherein: When at least two sections of the sealing tubes are provided, the sealing tubes are sequentially connected via corresponding coupling microwave connectors.

4. The drone stealth antenna device according to claim 2, wherein: The power supply module includes: a DC power supply; The DC power supply is electrically connected to the control module, and the DC power supply is electrically connected to each sealing tube respectively; When the DC power supply supplies power to each sealed tube, plasma is generated inside the sealed tube; The control module controls each sealed tube to adjust the plasma concentration through a DC power supply.

5. The drone stealth antenna device according to claim 2, wherein: The magnetic ring is nested on any of the sealing tubes; The microwave signal input port receives the microwave signal emitted by the microwave signal generator, and the microwave signal is coupled to the plasma in the sealed tube by the magnetic ring for spatial radiation; The control module obtains the matching status of the microwave signal input port through the microwave signal reflection port.

6. The drone stealth antenna device according to claim 5, wherein: When the acquired reflection value at the microwave signal input port exceeds a first set value, the control module controls the power supply module to increase the power supply voltage to the sealed tube.

7. The drone stealth antenna device according to claim 5, wherein: The magnetic ring is nested in the center of the sealing tube.

8. The drone stealth antenna device according to claim 2, wherein: The probe of the plasma monitoring module is placed in the sealed tube to detect the plasma concentration in the sealed tube.

9. The drone stealth antenna device according to claim 8, wherein: The characteristic frequency point of the lossless penetrating plasma is obtained by the plasma concentration in the sealed tube, and when the characteristic frequency point is higher than the working frequency band of the detection radar, the control module controls the power supply module to reduce the power supply voltage to the sealed tube.

10. A method for operating the stealth antenna device for a drone according to any one of claims 1 to 9, characterized in that: include: The plasma generating module is powered by the power supply module, so that the plasma generating module generates plasma therein, and the high-frequency electromagnetic wave coupling module couples the microwave signal into the plasma in the plasma generating module for spatial radiation; The control module detects the microwave signal input state and plasma concentration through the high-frequency electromagnetic wave coupling module and the plasma monitoring module respectively, so that the control module controls the plasma generation module to adjust the plasma concentration through the power supply module.

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