An electromagnetic decoy jamming device

Abstract

The application provides an electromagnetic decoy jamming device, and relates to the technical field of jamming, to solve the technical problem of poor jamming capability of a jamming device. The electromagnetic decoy jamming device comprises two dihedral angle reflection structures arranged at intervals along a first direction, and the openings of the two dihedral angle reflection structures are consistent in direction; wherein the first direction is perpendicular to the length direction of the dihedral angle reflection structure; each dihedral angle reflection structure comprises a first structure, a second structure and two mutually perpendicular bases, and the first structure and the second structure are arranged on the inner side surfaces of the two bases respectively; the reflection phase and the reflection amplitude of the dihedral angle reflection structure are adjustable, so that the phase difference of the reflection waves of the two dihedral angle reflection structures in the far field direction is 160°-200° and the amplitude ratio is 0.9-1.1. The electromagnetic decoy jamming device can realize stable jamming capability in the case of radar tracking normal incidence or oblique incidence.

Description

Technical Field

[0001] This invention relates to the field of interference technology, and in particular to an electromagnetic deception interference device. Background Technology

[0002] Existing angle deception jamming techniques, such as terrain bounce jamming, scintillation jamming, towed decoys, and cross-eye jamming, can interfere with monopulse radar. Traditional cross-eye jamming systems rely on a dual-source reverse antenna structure to achieve angle deception, but their structure is complex, dependent on power control and precise feed line design, susceptible to multipath effects, and their jamming effectiveness drops sharply under oblique incidence radar tracking conditions, severely limiting their engineering applications. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic deception interference device to solve the technical problem of poor interference capability of interference devices.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides an electromagnetic deception interference device, comprising two dihedral reflective structures spaced apart along a first direction, wherein the openings of the two dihedral reflective structures face the same direction; wherein, the first direction is perpendicular to the length direction of the dihedral reflective structures;

[0006] Each of the dihedral reflective structures includes a first structure, a second structure, and two mutually perpendicular bases, wherein the first structure and the second structure are respectively disposed on the inner surfaces of the two bases;

[0007] The reflection phase and amplitude of the dihedral reflector are adjustable so that the phase difference between the reflected waves of the two dihedral reflectors in the far field direction is 160° to 200° and the amplitude ratio is 0.9 to 1.1.

[0008] According to at least one embodiment of the present invention, the first structure is formed by an array of multiple metasurface units;

[0009] The second structure is formed by an array of multiple metasurface units or is a metal plate.

[0010] According to at least one embodiment of the present invention, the reflection phase of the first structure is adjustable; and / or,

[0011] When the second structure is formed by an array of multiple metasurface units, the reflection amplitude of the second structure is adjustable.

[0012] According to at least one embodiment of the present invention, the metasurface unit includes a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer and a feed layer stacked sequentially.

[0013] The first metal layer is electrically connected to the second metal layer and the feed layer, respectively.

[0014] According to at least one embodiment of the present invention, the metasurface unit further includes an adhesive layer located between the second dielectric layer and the second metal layer.

[0015] According to at least one embodiment of the present invention, the first dielectric layer comprises a polytetrafluoroethylene (PTFE) plate, wherein the PTFE plate is an F4B dielectric substrate; and / or,

[0016] The second dielectric layer includes a polytetrafluoroethylene (PTFE) plate, wherein the PTFE plate is an F4B dielectric substrate.

[0017] According to at least one embodiment of the present invention, the thickness of the first dielectric layer is 2 mm; and / or,

[0018] The thickness of the second dielectric layer is 0.8 mm.

[0019] According to at least one embodiment of the present invention, the dielectric constant of the first dielectric layer is 2.65 and the loss tangent is 0.001; and / or,

[0020] The dielectric constant of the second dielectric layer is 2.65 and the loss tangent is 0.001.

[0021] According to at least one embodiment of the present invention, the first metal layer includes a first metal patch and a plurality of second metal patches; the metasurface unit further includes a plurality of diodes;

[0022] Each of the diodes is electrically connected to the first metal patch and the corresponding second metal patch, respectively.

[0023] According to at least one embodiment of the present invention, the diode is a PIN diode, and the diode model is SMP1340-040LF.

[0024] According to at least one embodiment of the present invention, the metasurface unit is square in shape, the first metal patch is square in shape, and the second metal patch is rectangular in shape and there are four of them. Each second metal patch is arranged around the corresponding side of the first metal patch, and the short side of the second metal patch is the same length as the side of the first metal patch.

[0025] According to at least one embodiment of the present invention, the short side of the second metal patch away from the first metal patch is flush with the edge of the metasurface unit.

[0026] According to at least one embodiment of the present invention, there is a gap between the first metal patch and the four second metal patches, the number of diodes is four, each diode is disposed in the middle of the corresponding gap, and the positive terminal of the diode is electrically connected to the first metal patch, and the negative terminal of the diode is electrically connected to the second metal patch.

[0027] According to at least one embodiment of the present invention, the first metal patch is electrically connected to the positive electrode feed line of the feed layer through a metal via through the first dielectric layer, the second metal layer, and the second dielectric layer;

[0028] One of the four second metal patches is electrically connected to the negative feed line of the feed layer through a metal via through the first dielectric layer, the second metal layer, and the second dielectric layer. The other three second metal patches are electrically connected to the first dielectric layer and the second metal layer through metal vias, respectively.

[0029] According to at least one embodiment of the present invention, when the first structure is formed by an array of multiple metasurface units and the second structure is formed by an array of multiple metasurface units, the feed layers of each metasurface unit in the first structure are electrically connected, and the feed layers of each metasurface unit in the second structure are electrically connected.

[0030] According to at least one embodiment of the present invention, a DC power supply is further included, the DC power supply being electrically connected to each feed layer of the metasurface unit.

[0031] In one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0032] The electromagnetic decoy jamming device of an exemplary embodiment of the present invention comprises a first structure and a second structure respectively disposed on the inner surfaces of two mutually perpendicular bases to form dihedral reflective structures. The two dihedral reflective structures are then spaced apart and arranged side-by-side along a first direction, with their openings facing the same direction. The first direction is perpendicular to the length direction of the dihedral reflective structures. That is, the cross-section of the dihedral reflective structures is approximately L-shaped, and the L-shape of the cross-sections of the two dihedral reflective structures approximately forms a W-shape. The first structure and / or the second structure of the two dihedral reflective structures can be formed by an array of multiple metasurface units, allowing the phase difference of the reflected waves from the two dihedral reflective structures in the far-field direction to be 160°–200° and the amplitude ratio to be 0.9–1.1. Based on this, through simulation and calculation, the jamming device exhibits good consistency in reflection characteristics from 10 GHz to 16 GHz. In other words, the electromagnetic decoy jamming device of the exemplary embodiment of the present invention possesses wide-frequency domain jamming capability.

[0033] Furthermore, regardless of whether the radar tracking beam is incident directly or obliquely, the obtained interference angle misleads the radar tracking direction to deviate from the actual target by 21.87°±1.5°. The misleading angle deviation is stable, thus effectively disrupting radar tracking and target identification, and protecting the target where the jamming device is located.

[0034] Compared to existing cross-eye jamming systems that rely on dual-source reverse antenna structures to achieve angle deception, the electromagnetic deception jamming device of the exemplary embodiment of the present invention has a simple structure and does not require a radiation source or a complex power supply system. Attached Figure Description

[0035] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0036] Figure 1 This is an exploded structural diagram of a metasurface unit according to an embodiment of the present invention;

[0037] Figure 2 This is a top view of the metasurface unit according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of an interference device according to an embodiment of the present invention;

[0039] Figure 4 This is the reflection amplitude curve of the metasurface unit according to an embodiment of the present invention;

[0040] Figure 5 This is the reflection phase curve of the metasurface unit according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the interference principle of the interference device according to an embodiment of the present invention, wherein (a) is the case where the radar tracking wave is incident perpendicularly and (b) is the case where the radar tracking wave is incident obliquely.

[0042] Figure 7 The instantaneous electric field distribution of the interference device according to the embodiment of the present invention under different incident electromagnetic wave irradiation is as follows: (a) when the phase difference is 0°, vertical incidence; (b) when the phase difference is 180°, vertical incidence; (c) when the phase difference is 180°, oblique incidence; (d) when the phase difference is 180°, oblique incidence.

[0043] Figure label:

[0044] 11. First metal patch; 12. Second metal patch; 13. Diode;

[0045] 21. First dielectric layer; 22. Second dielectric layer;

[0046] 30. Second metal layer;

[0047] 40. Adhesive layer;

[0048] 51. Positive feeder line; 52. Negative feeder line;

[0049] 60. Metal vias;

[0050] 70. Base;

[0051] 81. First structure; 82. Second structure. Detailed Implementation

[0052] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be 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 illustrative of the present invention and are not intended to limit the present invention.

[0053] Cross-eye jamming interferes with enemy radar tracking by emitting false or distorted echo signals. It causes the received radar signal to deviate or become distorted, forcing a monopulse radar / seeker to point away from the protected aircraft, ship, or other platform. Cross-eye jamming is based on the theory of angular scintillation and is also known as artificial angular scintillation jamming or wavefront distortion jamming.

[0054] Specifically, angular scintillation refers to the phenomenon of phase disturbance in the radar echo of a complex target, which causes errors in the radar's direction indication of the target. Cross-eye interference can be physically explained from the perspective of interference phenomena: when two interference signals with approximately equal amplitude and opposite phase are combined in space, they undergo destructive interference and form a null. At the null, the phase wavefront is distorted, which in turn causes the direction of the wavefront normal reaching the radar aperture to deflect.

[0055] However, traditional cross-eye jamming systems rely on a dual-source reverse antenna structure to achieve angle deception. Different feeder lengths and device responses can introduce non-ideal phase delays and power imbalances, affecting the stability of the jamming effect. They are also highly sensitive to the incident direction, and under oblique incidence conditions, jamming often fails due to spatial mismatch of the interference wavefront. In addition, because the transmit and receive antennas are separated (physically separate) and do not satisfy antenna reciprocity, the system is susceptible to multipath effects and environmental noise interference, and its jamming robustness is insufficient in complex environments such as urban areas and mountainous regions.

[0056] To address the aforementioned problems, the exemplary embodiments of this invention employ amplitude- and phase-tunable metasurface elements instead of traditional reverse antenna arrays, enabling the modulation of monostatic echo characteristics within a wide-angle domain. For example, the structural principle of a dihedral reflector is used to enhance the wide-angle RCS. Specifically, the dihedral reflector utilizes multiple reflections of electromagnetic waves on a metal plane to create monostatic scattering enhancement within the wide-angle domain.

[0057] Figure 3 This is a schematic diagram of the interference device according to an embodiment of the present invention. Figure 3 As shown, the electromagnetic deception interference device provided by the exemplary embodiment of the present invention includes two dihedral reflective structures spaced apart along a first direction, with the openings of the two dihedral reflective structures facing the same direction; wherein, the first direction is perpendicular to the length direction of the dihedral reflective structures; each dihedral reflective structure includes a first structure 81, a second structure 82, and two mutually perpendicular bases 70, with the first structure 81 and the second structure 82 respectively disposed on the inner surfaces of the two bases 70; the reflection phase and reflection amplitude of the dihedral reflective structures are adjustable, so that the phase difference of the reflected waves of the two dihedral reflective structures in the far-field direction is 160° to 200° and the amplitude ratio is 0.9 to 1.1.

[0058] In practical applications, based on the principle of dihedral reflectors to enhance the wide-angle radar cross section (RCS), two identical L-shaped (vertically positioned) bases 70 are set. A first structure 81 and a second structure 82 are respectively set on the inner sides of the two bases 70, forming the two reflecting surfaces of the dihedral reflector. At least one of the first structure 81 and the second structure 82 is formed by an array of multiple metasurface units, thus forming a dihedral reflective structure. An electromagnetic decoy jamming device is formed by two dihedral reflective structures arranged side-by-side and spaced apart.

[0059] Specifically, the cross-sections of the two dihedral emitting structures are approximately W-shaped, with the two openings on the same plane and roughly facing the radar tracking beam. The extension direction of the intersecting edges of the two bases 70 in the dihedral reflector structure is its length direction, and the edges of the two dihedral reflectors are on the same plane and parallel to the same plane where the two openings are located.

[0060] The placement is more convenient by laying the metasurface unit array on the inner surface of the dihedral reflector. By adjusting the reflection amplitude and phase of the metasurface unit array, the phase difference of the reflected waves from the two dihedral reflector structures in the far field direction can be 160° to 200°, for example, 160°, 162°, 164°, 166°, 168°, 170°, 172°, 174°, 176°, 178°, 180°, 182°, 184°, 186°, 188°, 190°, 192°, 194°, 196°, 198°, 200°, or within any two of the above values.

[0061] For example, by adjusting the reflection amplitude and reflection phase of the metasurface unit array, the amplitude ratio of the reflected waves from the two dihedral reflective structures in the far-field direction can be 0.9 to 1.1, for example, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1 or within any two of the above values.

[0062] In some implementations, continue as Figure 3 As shown, the two dihedral reflective structures have the same structure. For example, if the first structure 81 of one dihedral reflective structure is set on the base 70 on the right, then the first structure 81 of the other dihedral reflective structure is also set on the base 70 on the right.

[0063] In some embodiments, the first structure 81 can be formed by an array of multiple metasurface units, for example, m×n metasurface units, where m and n are both positive integers. The second structure 82 can also be formed by an array of multiple metasurface units, and can be completely identical in structure to the first structure 81. For example, the first structure 81 has an adjustable reflection phase, and the second structure 82 has an adjustable reflection amplitude.

[0064] In other embodiments, the first structure 81 can be formed by an array of multiple metasurface units, and the second structure 82 can be a metal plate with total internal reflection capability. When interference is turned off, it is in a wave-absorbing state, thus having a certain stealth effect. The two dihedral reflective structures formed in this embodiment can achieve the control of reflection amplitude and reflection phase by adjusting the first structure 81, thereby making the phase difference of the reflected wave in the far field direction 160° to 200° and the amplitude ratio 0.9 to 1.1.

[0065] Example 1

[0066] Figure 1 This is an exploded structural diagram of a metasurface unit according to an embodiment of the present invention; Figure 2 This is a top view schematic diagram of the metasurface unit according to an embodiment of the present invention. (Combined with...) Figure 1 and Figure 2 As shown, the metasurface unit provided in the exemplary embodiment of the present invention includes a first metal layer, a first dielectric layer 21, a second metal layer 30, a second dielectric layer 22 and a feed layer stacked sequentially; wherein the first metal layer is electrically connected to the second metal layer 30 and the feed layer respectively.

[0067] In some embodiments, the metasurface unit further includes an adhesive layer 40 located between the second dielectric layer 22 and the second metal layer 30 for bonding and fixing the two.

[0068] In practical applications, the first dielectric layer 21 includes a polytetrafluoroethylene (PTFE) plate, which is an F4B dielectric substrate; the second dielectric layer 22 includes a PTFE plate, which is also an F4B dielectric substrate. That is, the two dielectric layers are made of the same material, both have a dielectric constant of 2.65, and both have a loss tangent of 0.001.

[0069] F4B dielectric substrates are commonly used as substrates for high-frequency circuits (such as microwave and RF PCBs). They have low-loss characteristics and are suitable for antennas, filters, power dividers, etc.

[0070] For example, the thickness of the first dielectric layer 21 is 2 mm and the thickness of the second dielectric layer 22 is 0.8 mm.

[0071] For example, the second metal layer 30 is made of copper.

[0072] For example, the shape of the metasurface unit is square, and the shapes of the first dielectric layer 21, the second metal layer 30, and the second dielectric layer 22 are also square.

[0073] In some embodiments, the first metal layer includes a first metal patch 11 and a plurality of second metal patches 12; the metasurface unit also includes a plurality of diodes 13; each diode 13 is electrically connected to the first metal patch 11 and the corresponding second metal patch 12, respectively.

[0074] In practical applications, the first metal patch 11 is square in shape, and the second metal patch 12 is rectangular in shape and there are four of them. Each second metal patch 12 is arranged around the corresponding side of the first metal patch 11, and the short side of the second metal patch 12 is the same length as the side of the first metal patch 11.

[0075] like Figure 2As shown, the second metal patch 12 has a long side and a short side. The short side of the second metal patch 12, which is away from the first metal patch 11, is flush with the edge of the metasurface unit. The first metal patch 11 is located at the center, and the four second metal patches 12 are respectively disposed on the periphery of the four sides of the first metal patch 11, with a gap between each of the four second metal patches 12 and the corresponding side of the first metal patch 11.

[0076] A diode 13 is positioned at the midpoint of each gap, with the anode of diode 13 electrically connected (soldered) to the first metal patch 11 and the cathode of diode 13 electrically connected to the second metal patch 12. This results in a total of four diodes 13. Thus, the first metal patch 11, the four second metal patches 12, and the four diodes 13 are all printed on the first dielectric layer 21, forming a completely symmetrical structure (centrosymmetric and axially symmetric), thereby ensuring consistent electromagnetic response in any polarization direction.

[0077] like Figure 1 As shown, the first metal patch 11 is electrically connected to the positive electrode feed line 51 of the feed layer through the first dielectric layer 21, the second metal layer 30, and the second dielectric layer 22 via the metal via 60. The metal via 60 passes through a via (with a radius larger than the metal via 60) in the second metal layer 30 and forms electrical isolation with the second metal layer 30.

[0078] Metal vias refer to micro-holes drilled mechanically or by laser in multilayer PCBs, and then a layer of copper is deposited on the hole wall through chemical plating and electroplating to form a metallized hole wall. This connects the copper foils of the upper and lower layers or the internal layers, achieving vertical electrical interconnection.

[0079] For example, the four second metal patches 12 have identical structures. One of the four second metal patches 12 is electrically connected to the negative electrode feed line 52 of the feed layer after passing through the first dielectric layer 21, the second metal layer 30, and the second dielectric layer 22 via a metal via 60. This metal via 60 penetrates a through-hole (with a radius larger than the metal via 60) in the second metal layer 30, forming electrical isolation between the two layers. The other three second metal patches 12 are electrically connected to the second metal layer 30 after passing through the first dielectric layer 21 via corresponding metal vias 60.

[0080] In some embodiments, when the first structure 81 is formed by an array of multiple metasurface units and the second structure 82 is formed by an array of multiple metasurface units, the feed layers of each metasurface unit in the first structure 81 are electrically connected, and the feed layers of each metasurface unit in the second structure 82 are electrically connected.

[0081] For example, the first metal layers of two adjacent metasurface units are not connected to each other, so that each metasurface unit has independent control capability; and by connecting the feed wires (positive feed wire 51 and negative feed wire 52) in the feed layer of each metasurface unit to each other, the first structure 81 and the second structure 82 can be controlled, and the difficulty and cost of actual control can be reduced.

[0082] For example, the interference device provided in the exemplary embodiment of the present invention further includes a DC power supply, which is electrically connected to each feed layer of the metasurface unit, and the diode 13 can be turned on and off by a control device.

[0083] When diode 13 is on, it can be equivalent to an inductor and a resistor connected in series. When diode 13 is off, it can be equivalent to an inductor, a resistor, and a capacitor connected in series. By controlling the switching state of diode 13 and optimizing the resonant structure (each metal patch of the first metal layer) to construct a 1-bit encoding unit, a 1-bit encoded metasurface unit can be realized if the phase difference between the two switching states is 160° to 200°.

[0084] Multiple independent voltages from 0 to 5V are provided by a high-precision FPGA voltage-controlled driver board for regulation. Specifically, the metasurface unit and the FPGA control circuit are connected through a DC feed layer (feed network). The computer sends different encoded information to the FPGA control circuit, thereby dynamically adjusting the state of the PIN diodes in each metasurface unit to achieve real-time control of the reflection phase.

[0085] For example, diode 13 can be a PIN diode, and the model number of diode 13 is SMP1340-040LF.

[0086] Based on the aforementioned metasurface units, electromagnetic full-wave simulation analysis was performed using electromagnetic simulation software (CST Microwave Studio, CST).

[0087] Figure 4 This is the reflection amplitude curve of the metasurface unit according to an embodiment of the present invention. For example... Figure 4 As shown, the reflection amplitude curves of the metasurface unit in different states from 10 GHz to 16 GHz show that the amplitude ratio is 0.9 to 1.1 in the two states of diode 13 switching.

[0088] Figure 5 This is the reflection phase curve of the metasurface unit according to an embodiment of the present invention. For example... Figure 5 As shown, the reflection phase curves of the metasurface unit in different states from 10 GHz to 16 GHz show that the phase difference remains stable at 180°±20° in both states of diode 13 switching.

[0089] Combination Figure 4 and Figure 5 As shown, under both switching states of diode 13, the phase difference of the reflected phase of the metasurface unit remains stable at 180°±20° in the 10GHz~16GHz frequency domain, and the reflection amplitude ratio is close to 1, exhibiting good consistency in reflection characteristics. Specifically, when electromagnetic waves with different polarization angles (TE mode, TM mode) are incident perpendicularly, the reflection amplitude and reflection phase curves of the metasurface unit coincide, meaning that the metasurface unit has the same electromagnetic response to electromagnetic waves with different polarization angles.

[0090] It should be noted that in TE (Transverse Electric), the electric field direction is perpendicular to the incident plane, and the magnetic field direction is inside the incident plane; in TM (Transverse Magnetic), the electric field direction is inside the incident plane, and the magnetic field direction is perpendicular to the incident plane. Figure 4 and Figure 5 In this context, "on" represents the on state of diode 13, and "off" represents the off state of diode 13.

[0091] Example 2

[0092] The interference device provided by an exemplary embodiment of the present invention includes two dihedral reflective structures spaced apart along a first direction, with the openings of the two dihedral reflective structures facing the same direction; wherein, the first direction is perpendicular to the length direction of the dihedral reflective structures; each dihedral reflective structure includes a first structure 81, a second structure 82, and two mutually perpendicular bases 70, with the first structure 81 and the second structure 82 respectively disposed on the inner surfaces of the two bases 70; the reflection phase and reflection amplitude of the dihedral reflective structures are adjustable so that the phase difference of the reflected waves of the two dihedral reflective structures in the far-field direction is 160° to 200° and the amplitude ratio is 0.9 to 1.1.

[0093] Specifically, the first structure 81 and the second structure 82 have the same size. For example, they have the same structure and are both formed by the metasurface unit array in Embodiment 1, such as a 1×10 metasurface unit array. Optionally, the first structure 81 is formed by the metasurface unit array and the second structure 82 is a metal plate. The two have approximately the same size.

[0094] The wide-angle domain stable interference mechanism of the interference device provided in the exemplary embodiment of the present invention is based on the formation of a stable electromagnetic wave return path by means of a corner reflector. Its interference principle is as follows: Figure 6 As shown, Figure 6 This is a schematic diagram of the interference principle of the interference device according to an embodiment of the present invention.

[0095] Figure 6The interference angle θ refers to the angle between the observation direction (the line connecting the radar and the target's true position) and the interference direction, where the interference direction is perpendicular to the equiphase surface of the radar's tracking beam velocity. When the echo direction aligns with the radar's tracking (incident) beam direction, an observable signal of the target is formed. Effective interference (preventing the target from being detected by the enemy radar) is achieved only when the interference direction maintains a stable interference angle θ with the target's true direction (incident direction), thus protecting the target.

[0096] The interference performance of the interference device is determined by calculating its electric field and phase distribution. The results are as follows: Figure 7 As shown, Figure 7 This refers to the instantaneous electric field distribution of the interference device according to an embodiment of the present invention under different incident electromagnetic wave irradiations.

[0097] See Figure 7 a. From the extracted instantaneous reflected electric field, when the reflection phase difference of the interference device is 0°, the plane wave field generated by the two dihedral reflection structures does not undergo wavefront distortion.

[0098] When the reflected waves generated by two dihedral reflective structures satisfy the condition of phase difference and amplitude matching in the far-field direction (phase difference 180°, amplitude ratio tending to 1), a "null" region and wavefront distortion are generated at the radar receiver aperture, such as... Figure 7 As shown in b, this causes the radar to misjudge the target's direction during angle measurement. This distorted wavefront echo signal can cause the received radar signal to deviate or become distorted, thus misleading the radar's judgment of information such as the target's angle and position. Among these factors, changes in the electric field play a major role in interference, effectively disrupting radar detection and target identification.

[0099] Reference Figure 7 As shown in b, the "zero-depression" region is the location where wavefront distortion occurs, which is the straight line connecting the two dashed boxes in the figure.

[0100] Figure 7 b is the instantaneous reflected electric field when the radar tracking wave is incident perpendicularly. Furthermore, by calculating the instantaneous reflected electric field when the radar tracking wave is incident obliquely... Figure 7 c represents the electric field distribution at an oblique incidence angle of 10°. Figure 7 Let d represent the electric field distribution under oblique incidence at an angle of 20°. Under oblique incidence conditions, when the reflected waves generated by the two dihedral reflective structures satisfy the phase difference and amplitude matching condition in the far-field direction (phase difference 180°, amplitude ratio tending to 1), wavefront distortion still exists. Based on this, under oblique incidence conditions, this distorted wavefront echo signal can effectively disrupt radar detection and target identification.

[0101] Furthermore, by calculating the interference angle, it can be seen that whether the incident wave is vertically or obliquely incident, the direction of the misleading radar tracking wave deviates from the actual target by 21.87°±1.5°, which forms a stable interference angle and achieves angle deception for radar tracking angle measurement.

[0102] As can be seen from the above, the electromagnetic deception interference device provided by the exemplary embodiment of the present invention can form a stable interference capability in a wide frequency range (10GHz~16GHz) and a wide incident angle (0°~20°), and the interference angle remains stable (21.87°±1.5°), thus having a stable angle deception interference effect.

[0103] Compared to traditional cross-eye jamming systems in the prior art, the electromagnetic deception jamming device provided by the exemplary embodiment of the present invention, without the need for a radiation source or complex power supply system, and with a simple structure, utilizes spatial symmetry to construct a metasurface unit array to generate a reflected wave signal with a stable interference angle, thereby achieving the purpose of misleading radar tracking wave velocity and angle measurement, and possessing good wide-frequency domain and wide-angle domain jamming capabilities.

[0104] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. An electromagnetic deception interference device, characterized in that, It includes two dihedral reflective structures spaced apart along a first direction, with the openings of the two dihedral reflective structures facing the same direction; wherein, the first direction is perpendicular to the length direction of the dihedral reflective structures; the L-shaped cross-sections of the two dihedral reflective structures roughly form a W-shape; Each of the dihedral reflective structures includes a first structure, a second structure, and two mutually perpendicular bases, wherein the first structure and the second structure are respectively disposed on the inner surfaces of the two bases; The reflection phase and amplitude of the dihedral reflector are adjustable so that the phase difference between the reflected waves of the two dihedral reflectors in the far field direction is 160° to 200° and the amplitude ratio is 0.9 to 1.

1.

2. The interference device according to claim 1, characterized in that, The first structure is formed by an array of multiple metasurface units; The second structure is formed by an array of multiple metasurface units or is a metal plate.

3. The interference device according to claim 2, characterized in that, The reflection phase of the first structure is adjustable; and / or, When the second structure is formed by an array of multiple metasurface units, the reflection amplitude of the second structure is adjustable.

4. The interference device according to claim 3, characterized in that, The metasurface unit comprises a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer, and a feeding layer stacked sequentially. The first metal layer is electrically connected to the second metal layer and the feed layer, respectively.

5. The interference device according to claim 4, characterized in that, The metasurface unit further includes an adhesive layer located between the second dielectric layer and the second metal layer.

6. The interference device according to claim 4, characterized in that, The first dielectric layer includes a polytetrafluoroethylene (PTFE) plate, wherein the PTFE plate is an F4B dielectric substrate; and / or, The second dielectric layer includes a polytetrafluoroethylene (PTFE) plate, wherein the PTFE plate is an F4B dielectric substrate.

7. The interference device according to claim 4, characterized in that, The thickness of the first dielectric layer is 2 mm; and / or, The thickness of the second dielectric layer is 0.8 mm.

8. The interference device according to claim 6 or 7, characterized in that, The dielectric constant of the first dielectric layer is 2.65 and the loss tangent is 0.001; and / or, The dielectric constant of the second dielectric layer is 2.65 and the loss tangent is 0.

001.

9. The interference device according to claim 4, characterized in that, The first metal layer includes a first metal patch and a plurality of second metal patches; the metasurface unit also includes a plurality of diodes; Each of the diodes is electrically connected to the first metal patch and the corresponding second metal patch, respectively.

10. The interference device according to claim 9, characterized in that, The diode is a PIN diode, and its model number is SMP1340-040LF.

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