Functional scattering regulation and control device for frequency selective surface composite half-wave oscillator antenna

Abstract

The invention relates to a functional scattering regulation and control device for a frequency selective surface composite half-wave oscillator antenna, and belongs to the technical field of functional wave-absorbing materials. The device comprises a rectangular metal bottom plate and an active frequency selective surface wave absorber array arranged on the rectangular metal bottom plate, any two opposite angles of the rectangular metal bottom plate are respectively provided with a half-wave oscillator antenna; wave absorber units in the active frequency selective surface wave absorber array are connected in series to form a series structure, and a conductive patch feeder line is arranged at the tail end of the series structure. According to the invention, the depth reduction and height enhancement of the backward single-station radar cross section of the metal flat plate can be realized in a target frequency band range.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional absorbing materials, and more specifically, relates to a functional scattering control device for a frequency selective surface composite half-wave dipole antenna. Background Art

[0002] The diversification of modern military equipment missions has driven the need for wide-band dynamic control of radar scattering characteristics. To enhance the survivability of military equipment in increasingly complex electromagnetic countermeasure environments, radar-absorbing structures are required to minimize radar detection. To meet the demands of electromagnetic deception and friend-or-foe identification, scattering enhancement technologies that improve radar cross-sections are urgently needed.

[0003] A half-wave dipole antenna, which responds to electromagnetic waves through conductor resonance, boasts high efficiency, low cost, and simple fabrication. By properly designing its feed system and radiating structure, it can achieve high-gain, broadband electromagnetic wave radiation and reception within a limited electrical footprint.

[0004] Thanks to their advantages of being thin, light, wide, and strong, frequency selective surfaces (FSSs) are widely used in the field of electromagnetic absorption. Furthermore, by loading active devices onto these surfaces, they can dynamically control the electromagnetic properties of a target, simulating the electromagnetic scattering characteristics of the external environment in real time, thereby achieving electromagnetic camouflage.

[0005] Generally speaking, frequency-selective surfaces loaded with active devices can adjust their electromagnetic wave response, dynamically controlling their absorption by varying the resistance of the active devices. Currently, most research focuses solely on the role of absorption in electromagnetic scattering, with little effort linking broadband electromagnetic absorption with enhanced broadband electromagnetic scattering. Summary of the Invention

[0006] To address the aforementioned shortcomings and improvements in existing technologies, the present invention provides a functional scattering control device using a frequency-selective surface composite half-wave dipole antenna. While ensuring strong broadband backward monostatic radar cross section reduction, the device utilizes a half-wave dipole antenna to achieve high broadband backward monostatic radar cross section enhancement. This device can achieve both 10dBsm radar cross section reduction and enhancement across a wide S-band frequency range, and its operating frequency band can be expanded to even wider frequency bands, thereby resolving the existing issue of integrated and compatible radar cross section enhancement and reduction.

[0007] To achieve the above-mentioned objectives, the present invention provides a frequency selective surface composite half-wave dipole antenna functional scattering control device, characterized in that it includes a rectangular metal base plate and an active frequency selective surface absorber array arranged on the rectangular metal base plate; half-wave dipole antennas are respectively arranged at any two diagonal corners of the rectangular metal base plate; the individual absorber units in the active frequency selective surface absorber array are connected in series to form a series structure, and a conductive patch feed line is provided at the end of the series structure.

[0008] Preferably, any one of the half-wave dipole antennas includes a radiating surface, two orthogonally arranged baluns and four reflectors, the radiating surface is processed with a radiating arm conductive patch pattern, the radiating arm conductive patch pattern has two half-wave dipoles that can respond to electromagnetic waves in orthogonal polarization directions and are perpendicular to each other; the two orthogonally arranged baluns are embedded in the radiating surface through the upper protrusion, the two orthogonally arranged baluns are located below the radiating surface and are arranged perpendicular to the radiating surface; the two orthogonally arranged baluns are connected to the rectangular metal base plate through the lower protrusion; the four reflectors are respectively located on the periphery of the half-wave dipole antenna.

[0009] Preferably, any one of the baluns includes a balun floor, a balun feeder and a balun dielectric support layer; the balun floor and the balun feeder are respectively processed on the front and back sides of the balun dielectric support layer.

[0010] Preferably, the material of the balun dielectric support layer is glass fiber epoxy resin, polytetrafluoroethylene plate, Rogers 5880 or polyimide film, with a thickness of 0.2mm to 3.0mm; the material of the balun floor and balun feeder is copper foil, aluminum foil, silver paste coating or carbon film.

[0011] Preferably, the width of any one of the baluns is 10-40 mm, and the height is 10-40 mm; the width of the balun feed line is 0.1-3.0 mm.

[0012] Preferably, the balun feed line extends downward to the same length as the balun floor, and the balun feed line and the end of the balun floor constitute a radio frequency microstrip line port; one of the radio frequency microstrip line ports is used to be connected to the input end of a circuit system having a radio frequency signal power amplification function, and the output end of the circuit system is then connected to the radio frequency microstrip line port in the corresponding polarization direction of another half-wave dipole antenna.

[0013] Preferably, the circuit gain of the circuit system having the radio frequency signal power amplification function is calculated by formula (1):

[0014]

[0015] Among them: G ampis the circuit gain of the circuit system with RF signal power amplification function, dimensionless; σ is the radar cross-section of the frequency selective surface composite half-wave dipole antenna functional scattering control device in the scattering enhancement state, unit is m 2 ;λ is the operating wavelength, unit is m; L EC is the minimum side length of the half-wave dipole antenna, in m; ε A is the aperture efficiency of the half-wave dipole antenna, dimensionless; Γ is the port reflection coefficient of the half-wave dipole antenna, dimensionless.

[0016] Preferably, the circuit gain of the circuit system having the radio frequency signal power amplification function and the minimum side length of the half-wave array antenna have a constraint relationship as shown in formula (2):

[0017]

[0018] Among them, G lat is the gain of the half-wave dipole antenna in the direction parallel to the tangent of the frequency selective surface composite half-wave dipole antenna functional scattering control device, dimensionless; L is the minimum side length of the rectangular metal base plate, unit is m.

[0019] Preferably, the absorber unit of the active frequency selective surface absorber includes an absorbing layer and a dielectric isolation layer; the surface of the absorbing layer is processed with a periodically arranged conductive patch pattern; a diode device with a variable resistance is welded inside the conductive patch pattern; a lumped inductor device is welded in the gap between adjacent conductive patch patterns; the lumped inductor device, the conductive patch pattern and the conductive patch feed line constitute a feeding network for regulating the electromagnetic wave absorption intensity of the active frequency selective surface absorber.

[0020] Preferably, the dielectric isolation layer is made of aramid paper honeycomb material or polymethacrylimide foam material, with a thickness of 10-40 mm.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] (1) The present invention provides a functional scattering control device for a frequency selective surface composite half-wave dipole antenna. The frequency selective surface absorber is composed of a periodically arranged conductor frequency selective surface pattern processed on a dielectric support layer, and a diode with variable resistance is welded in the unit to dynamically change the electromagnetic wave absorption effect of the structure. The half-wave dipole antenna is composed of a conductor balun feed and balun floor pattern processed on the front and back sides of the dielectric support layer and a conductor radiation layer pattern processed on the dielectric support layer, which are sequentially overlapped on a metal base plate. The half-wave dipole antenna can achieve high-gain, wide-band electromagnetic wave reception and radiation effects in a smaller size. A pair of half-wave dipole antennas are respectively connected to any active circuit with radio frequency power amplification effect in the corresponding working frequency band to achieve high-amplitude, wide-band electromagnetic scattering enhancement effects. In summary, by uniformly and reasonably controlling the electromagnetic absorption capacity of the frequency selective surface absorber or the electromagnetic enhancement capacity of a pair of half-wave dipole antennas, a wide-amplitude reduction and enhancement effect covering the S-band backward single-station radar scattering cross section is achieved.

[0023] (2) The present invention provides a functional scattering control device for a frequency selective surface composite half-wave dipole antenna. The half-wave dipole antenna has a simple design structure and is relatively independent. There are no restrictions on the design of the frequency selective surface absorber. The design method is clear and simple, which is conducive to engineering implementation and maintenance.

[0024] (3) The present invention provides a frequency selective surface composite half-wave dipole antenna functional scattering control device, which mainly uses polyimide film and aramid paper honeycomb / low-density foam board as main raw materials. These raw materials have the characteristics of low density and light weight, and are suitable for carriers that require light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of the functional scattering control device of the frequency selective surface composite half-wave dipole antenna provided by the present invention; (a) is a 3D structural schematic diagram, (b) is a top view, (c) is a side view, (d) is a detailed view of the upper conductive patch feed line, and (e) is a detailed view of the lower conductive patch feed line.

[0026] Figure 2 This is a schematic structural diagram of the half-wave dipole antenna in the frequency selective surface composite half-wave dipole antenna functional scattering control device provided by the present invention; wherein (a) is a schematic structural diagram of the 3D structure of the half-wave dipole antenna, (b) and (c) are schematic structural diagrams of the balun of the half-wave dipole antenna in two polarization directions, respectively, and (c) and (d) are top structural views of the balun of the half-wave dipole antenna in two polarization directions, respectively.

[0027] Figure 3It is a schematic diagram of the 3D structure of the frequency selective surface absorber in the functional scattering control device of the frequency selective surface composite half-wave dipole antenna provided by the present invention.

[0028] Figure 4 These are the test results of the backward single-station radar cross-section reduction and enhancement performance of the frequency selective surface composite half-wave dipole antenna functional scattering control device of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the functional scattering control device of the frequency selective surface composite half-wave dipole antenna in Example 2, wherein the active frequency selective surface absorber adopts the Jerusalem unit topology design; (a) is a 3D structural schematic diagram, (b) is a top view, and (c) is a side view.

[0030] Figure 6 It is a schematic diagram of the 3D structure of the frequency selective surface absorber in the frequency selective surface composite half-wave dipole antenna functional scattering control device in Example 2.

[0031] Figure 7 These are the test results of the backward single-station radar cross-section reduction and enhancement performance of the frequency selective surface composite half-wave dipole antenna functional scattering control device in Example 2.

[0032] Figure 8 This is a schematic diagram of the structure of the functional scattering control device for the frequency-selective surface composite half-wave dipole antenna in Example 3. The reflector of the half-wave dipole antenna is positioned at a 31-degree angle to the metal base plate, and the side length of the structure is 124 mm. The topology of the radiating arm of the half-wave dipole antenna is square, with two rectangular hollows inside. (a) is a schematic diagram of the 3D structure, (b) is a top view, and (c) is a side view.

[0033] Figure 9 It is a schematic diagram of the 3D structure of the half-wave dipole antenna in the frequency selective surface composite half-wave dipole antenna functional scattering control device in Example 3.

[0034] Figure 10 These are the test results of the backward single-station radar cross-section reduction and enhancement performance of the frequency selective surface composite half-wave dipole antenna functional scattering control device in Example 3.

[0035] In all the drawings, the same reference numerals are used to represent the same elements or structures, including: 1-conductive patch feed line, 2-RF microstrip line port, 3-rectangular metal base plate, 4-radiating surface, 5-radiating arm conductive patch pattern, 6-balun, 7-reflector, 8-balun floor, 9-balun feed line, 10-balun dielectric support layer, 11-conductive patch pattern, 12-diode device, 13-lumped inductor device, 14-absorbing layer, 15-dielectric isolation layer. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] The present invention provides a frequency selective surface composite half-wave dipole antenna functional scattering control device, comprising a rectangular metal base plate and an active frequency selective surface absorber array arranged on the rectangular metal base plate; half-wave dipole antennas are respectively arranged at any two diagonal corners of the rectangular metal base plate; the absorber units in the active frequency selective surface absorber array are connected in series to form a series structure, and a conductive patch feed line is provided at the end of the series structure.

[0038] In some embodiments, any one of the half-wave dipole antennas includes a radiating surface, two orthogonally arranged baluns and four reflectors, the radiating surface is processed with a radiating arm conductive patch pattern, the radiating arm conductive patch pattern has two half-wave dipoles that can respond to electromagnetic waves in orthogonal polarization directions and are perpendicular to each other (each half-wave dipole is composed of two symmetrical radiating arms, and the radiating arm conductive patch pattern has a total of 4 radiating arms with 90° rotational symmetry); the two orthogonally arranged baluns are embedded in the radiating surface through the upper protrusion, and are located below the radiating surface, and are arranged perpendicular to the radiating surface; the two orthogonally arranged baluns are connected to the rectangular metal base plate through the upper protrusion; the four reflectors are respectively located on the periphery of the half-wave dipole antenna.

[0039] In some embodiments, any one of the baluns includes a balun floor, a balun feed line, and a balun dielectric support layer; the balun floor and the balun feed line are conductive patch patterns processed on the front and back sides of the balun dielectric support layer, respectively.

[0040] In some embodiments, the topological structure of the radiating arm may be square, fan-shaped, or trapezoidal, and may have fan-shaped, trapezoidal, or rectangular hollows inside.

[0041] In some embodiments, the side length of the conductive patch pattern of the radiation arm is 30-120 mm.

[0042] In some embodiments, the material of the balun dielectric support layer of the half-wave dipole antenna can be selected from glass fiber epoxy resin, polytetrafluoroethylene board, Rogers 5880 or polyimide film, with a thickness of 0.2mm to 3.0mm; the material of the balun floor and balun feeder can be selected from copper foil, aluminum foil, silver paste coating or carbon film.

[0043] In some embodiments, the balun on the half-wave dipole antenna has a width of 10-40 mm, a height of 10-40 mm, and a balun feed line width of 0.1-3.0 mm.

[0044] In some embodiments, each balun feed line mounted on the half-wave dipole antenna extends downward to be equal in length to the balun floor; the balun feed line, the balun floor, and the balun floor form a radio frequency microstrip line port with a port impedance of 50 ohms.

[0045] In some embodiments, the frequency selective surface composite half-wave dipole antenna functional scattering control device is characterized in that the reflector material can be selected from conductive materials such as metal or carbon fiber plates, and is placed perpendicular to the metal base plate or at any angle, and multiple reflectors surround the radiation surface in rotational symmetry with the center of the half-wave dipole antenna, with a vertical height of 0-40 mm.

[0046] In some embodiments, the half-wave oscillators of any one of the half-wave oscillator antennas in two polarization directions are connected to the input end of any circuit system having a radio frequency signal power amplification function through a radio frequency microstrip line port, and the output end of the circuit system is then connected to the radio frequency microstrip line port of the half-wave oscillator in the corresponding polarization direction of another half-wave oscillator antenna.

[0047] In some embodiments, the circuit gain of any circuit system having a radio frequency signal power amplification function connected to two half-wave dipole antennas is calculated by formula (1):

[0048]

[0049] Among them: G amp is the circuit gain of the circuit system with RF signal power amplification function, dimensionless; σ is the radar cross-section of the frequency selective surface composite half-wave dipole antenna functional scattering control device in the scattering enhancement state, unit is m 2 ;λ is the operating wavelength, unit is m; L EC is the minimum side length of the half-wave dipole antenna, in m; ε A is the aperture efficiency of the half-wave dipole antenna, dimensionless; Γ is the port reflection coefficient of the half-wave dipole antenna, dimensionless.

[0050] In the functional scattering control device of the frequency selective surface composite half-wave dipole antenna of the present invention, the circuit gain of the circuit system having the radio frequency signal power amplification function and the minimum side length of the half-wave array antenna have a constraint relationship as shown in formula (2):

[0051]

[0052] Among them, G latis the gain of the half-wave dipole antenna in the direction parallel to the tangent of the frequency selective surface composite half-wave dipole antenna functional scattering control device, dimensionless; L is the minimum side length of the rectangular metal base plate, unit is m.

[0053] In some embodiments, the basic unit of an active frequency selective surface absorber consists of an absorbing layer, a dielectric isolation layer, and a metal floor, with a unit period of 25-35 mm. The absorbing layer is a dielectric support layer, with a surface pattern of conductive patches arranged periodically in rows and columns. The basic unit topology of the conductive patch pattern is a center-connected unit or a ring unit. All conductive patch patterns are internally soldered with a variable resistance diode device, and the resistance of the diode device can be controlled by an external bias voltage to achieve dynamic regulation of the real part of the equivalent impedance of the frequency selective surface.

[0054] In some embodiments, the central connection unit is a cross unit or a Jerusalem unit; the ring unit is a square ring unit or a circular ring unit.

[0055] In some embodiments, the material of the dielectric isolation layer may be aramid paper honeycomb material, polymethacrylimide foam material or air, and the thickness is 10 mm to 40 mm.

[0056] In some embodiments, the material of the absorbing layer may be glass fiber epoxy resin, polytetrafluoroethylene plate, Rogers 5880 or polyimide film, with a thickness of 0.1 mm to 0.3 mm.

[0057] In some embodiments, the conductive patch pattern and the conductive patch feed line may be made of copper foil, aluminum foil, silver paste coating, or carbon film.

[0058] The present invention provides a functional scattering control device for a frequency selective surface composite half-wave dipole antenna, which aims to compatibly realize broadband electromagnetic scattering absorption and broadband electromagnetic scattering enhancement in a structure of limited size, and realize a composite design of broadband radar scattering cross section reduction and enhancement.

[0059] In order to further illustrate the functional scattering control device of the frequency selective surface composite half-wave dipole antenna provided by the present invention, it is described in detail below with reference to embodiments.

[0060] Example 1

[0061] A frequency selective surface composite half-wave dipole antenna functional scattering control device, such as Figure 1As shown, the device features an active frequency selective surface absorber array (AFSA) in the center, with a pair of half-wave dipole antennas placed diagonally at the edges. The AFSA arrays are connected in series, with conductive patch feed lines 1 installed on both sides. The pair of half-wave dipole antennas each have two RF microstrip line ports 2. The AFSA array and the pair of half-wave dipole antennas share a rectangular metal baseplate 3.

[0062] The rectangular metal base plate 3 is a square metal base plate with a size of 500mm*500mm, a material of aluminum, and a thickness of 2mm.

[0063] The basic structure of the half-wave dipole antenna includes a radiation surface 4, a balun 6, and a reflector 7. The side length of the structure is 110 mm. Figure 2 As shown in the figure, the radiating surface 4 is a dielectric support layer, with a radiating arm conductive patch pattern 5 machined on its surface. This pattern has four radiating arms with 90° rotational symmetry. The topology of the radiating arms of the half-wave dipole antenna is square with a fan-shaped hollow inside. The side length of the radiating arm conductive patch pattern 5 is 57 mm.

[0064] The balun includes a balun floor 8, a balun feed line 9, and a balun dielectric support layer 10. The balun floor 8 and balun feed line 9 are conductive patch patterns machined on the front and back surfaces of the balun dielectric support layer 10, respectively. The balun dielectric support layer 10 of the half-wave dipole antenna can be made of FR4 with a thickness of 0.8 mm. The balun floor 8 and balun feed line 9 can be made of copper foil.

[0065] The balun on the half-wave dipole antenna has a width of 20 mm and a height of 20 mm, and the balun feed line width is 1.6 mm.

[0066] The reflector 7 on the half-wave dipole antenna is placed perpendicular to the metal base plate, is made of aluminum, and has a height of 20 mm.

[0067] The half-wave dipoles of a half-wave dipole antenna in two polarization directions are connected to the input of any circuit system with RF signal power amplification function through RF microstrip line ports. The output of the circuit system is then connected to the RF microstrip line port of the half-wave dipole in the corresponding polarization direction of another half-wave dipole antenna. The circuit gain of the circuit system with RF signal power amplification function is 48dB.

[0068] The basic unit of the active frequency selective surface absorber is composed of an absorbing layer 14, a dielectric isolation layer 15 and a metal floor, and the unit period is 31 mm. Figure 3As shown. The absorbing layer is a dielectric support layer, and the surface is processed with a conductive patch pattern 11 arranged periodically in rows and columns. The basic unit topology of the conductive patch pattern is a square ring unit, with a square monitoring patch placed in the middle. A diode device 12 with variable resistance is welded inside the conductive patch pattern, and the resistance of the diode device can be controlled by an external bias voltage to achieve dynamic regulation of the real part of the equivalent impedance of the frequency selective surface. Lumped inductance devices 13 are welded in the gaps between adjacent conductive patch patterns; the lumped inductance device, the conductive patch pattern and the conductive patch feed line constitute a feeding network for regulating the electromagnetic wave absorption intensity of the active frequency selective surface absorber.

[0069] The material of the dielectric isolation layer 15 can be aramid paper honeycomb material with a thickness of 20 mm.

[0070] The material of the wave absorbing layer 14 may be FR4 with a thickness of 0.2 mm.

[0071] The material of the conductive patch pattern and the conductive patch feed line can be copper foil.

[0072] The model is simulated in the electromagnetic simulation software CST, and the simulation performance is as follows: Figure 4 As shown, by comparing with the RCS of the fully reflective baseboard, it is not difficult to find that the frequency selective surface composite half-wave dipole antenna functional scattering control device designed according to the present invention can effectively achieve deep reduction and high enhancement of the backward single-station RCS in the range of 2-4GHz.

[0073] Example 2

[0074] In this embodiment, the frequency selective surface composite half-wave dipole antenna functional scattering control device, the half-wave dipole antenna and the square metal base are the same as those in embodiment 1, such as Figure 5 The active frequency selective surface absorber adopts the Jerusalem unit topology design with a unit period of 33mm. The structural diagram is shown in Figure 6 As shown, the size, length and loading device are the same as the first graded impedance layer in Example 1.

[0075] The model is simulated in the electromagnetic simulation software CST, and the simulation performance is as follows: Figure 7 As shown, by comparing with the RCS of the full reflection base plate, it is not difficult to find that the gradient impedance edge-loaded frequency selective surface composite absorbing device designed according to the present invention can effectively achieve a strong reduction in the backward single-station RCS within the range of 0-90°.

[0076] Example 3

[0077] In this embodiment, the frequency selective surface composite half-wave dipole antenna functional scattering control device, the active frequency selective surface absorber and the square metal base plate are the same as those in embodiment 1. Figure 8The reflector of the half-wave dipole antenna is placed at 31 degrees to the metal base plate, and the side length of the structure is 124mm. The topological structure of the radiation arm of the half-wave dipole antenna is square, with two rectangular hollows inside, as shown in the figure. Figure 9 As shown, the side length of the conductive patch pattern (5) of the radiation arm is 45 mm.

[0078] The model is simulated in the electromagnetic simulation software CST, and the simulation performance is as follows: Figure 10 As shown, by comparing with the RCS of the full reflection base plate, it is not difficult to find that the gradient impedance edge-loaded frequency selective surface composite absorbing device designed according to the present invention can effectively achieve a strong reduction in the backward single-station RCS within the range of 0-90°.

[0079] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A frequency selective surface composite half-wave dipole antenna functional scattering control device, characterized in that: The invention comprises a rectangular metal base plate and an active frequency selective surface absorber array arranged on the rectangular metal base plate; half-wave dipole antennas are respectively arranged at any two diagonal corners of the rectangular metal base plate; the absorber units in the active frequency selective surface absorber array are connected in series to form a series structure, and a conductive patch feed line is arranged at the end of the series structure.

2. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 1, characterized in that: Any one of the half-wave dipole antennas includes a radiating surface, two orthogonally arranged baluns and four reflectors, the radiating surface is processed with a radiating arm conductive patch pattern, the radiating arm conductive patch pattern has two half-wave dipoles that can respond to electromagnetic waves in orthogonal polarization directions respectively and are perpendicular to each other; the two orthogonally arranged baluns are embedded in the radiating surface through the upper protrusion, the two orthogonally arranged baluns are located below the radiating surface and arranged perpendicular to the radiating surface; the two orthogonally arranged baluns are connected to the rectangular metal base plate through the lower protrusion; the four reflectors are respectively located on the periphery of the half-wave dipole antenna.

3. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 2, characterized in that: Any of the baluns includes a balun floor, a balun feeder and a balun dielectric support layer; the balun floor and the balun feeder are respectively processed on the front and back sides of the balun dielectric support layer.

4. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 3, characterized in that: The material of the balun dielectric support layer is glass fiber epoxy resin, polytetrafluoroethylene plate, Rogers 5880 or polyimide film, with a thickness of 0.2mm to 3.0mm; the material of the balun floor and balun feeder is copper foil, aluminum foil, silver paste coating or carbon film.

5. The functional scattering control device of the frequency selective surface composite half-wave dipole antenna according to claim 3, characterized in that: The width of any one of the baluns is 10-40 mm, and the height is 10-40 mm; the width of the balun feed line is 0.1-3.0 mm.

6. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 3, characterized in that: The balun feed line extends downward to be equal in length to the balun floor, and the balun feed line and the end of the balun floor form a radio frequency microstrip line port; One of the RF microstrip line ports is used to connect to the input end of a circuit system with RF signal power amplification function, and the output end of the circuit system is then connected to the RF microstrip line port in the corresponding polarization direction of another half-wave dipole antenna.

7. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 6, characterized in that: The circuit gain of the circuit system having the function of amplifying radio frequency signal power is calculated by formula (1): Among them: G amp is the circuit gain of the circuit system with RF signal power amplification function, dimensionless; σ is the radar cross-section of the frequency selective surface composite half-wave dipole antenna functional scattering control device in the scattering enhancement state, unit is m 2 ;λ is the operating wavelength, unit is m; L EC is the minimum side length of the half-wave dipole antenna, in m; ε A is the aperture efficiency of the half-wave dipole antenna, dimensionless; Γ is the port reflection coefficient of the half-wave dipole antenna, dimensionless.

8. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 7, characterized in that: The circuit gain of the circuit system with the radio frequency signal power amplification function and the minimum side length of the half-wave array antenna have a constraint relationship as shown in formula (2): Among them, G lat is the gain of the half-wave dipole antenna in the direction parallel to the tangent of the frequency selective surface composite half-wave dipole antenna functional scattering control device, dimensionless; L is the minimum side length of the rectangular metal base plate, unit is m.

9. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 1, characterized in that: The absorber unit of the active frequency selective surface absorber includes an absorbing layer and a dielectric isolation layer; the surface of the absorbing layer is processed with a periodically arranged conductive patch pattern; a diode device with a variable resistance is welded inside the conductive patch pattern; a lumped inductor device is welded in the gap between adjacent conductive patch patterns; the lumped inductor device, the conductive patch pattern and the conductive patch feed line constitute a feeding network for regulating the electromagnetic wave absorption intensity of the active frequency selective surface absorber.

10. The frequency selective surface composite half-wave dipole antenna functional scattering control device according to claim 9, characterized in that: The dielectric isolation layer is made of aramid paper honeycomb material or polymethacrylimide foam material, and has a thickness of 10-40 mm.

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