Multiple polarization low rcs all-metal reflectarray based on hyperbolic phase distribution

Abstract

The application discloses a kind of multi-polarization low RCS full-metal reflection array based on hyperbolic phase distribution, and the reflection array unit contains I-shaped metal column and metal floor from top to bottom.I-shaped metal column is three-dimensional structure, is arranged on the surface of square metal floor along xoy plane placement.I-shaped metal column is placed at the angle of +45 ° or-45 ° with x axis, can present two different electromagnetic responses with phase difference of 180 ° to linearly polarized electromagnetic wave with polarization angle of 45 ° and 135 ° propagating along z axis, two unit states are represented by binary digits "0" and "1", corresponding phase electromagnetic response is 0 ° and 180 ° respectively.The angle value calculated by substituting the corresponding coordinates of the center of each unit in the reflection array into hyperbolic phase function is normalized to two phase electromagnetic states, to obtain the unit state distribution on the reflection array.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radar communication, in particular to a multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution. BACKGROUND

[0002] With the rapid development of radar detection technology, the survivability of weapon platforms is facing more and more severe challenges. The survivability of weapon platforms may greatly affect the outcome of modern warfare. Therefore, the radar cross section (RCS) reduction technology for aircraft, ships, missiles and other targets has received widespread attention in recent years. The size of RCS is the standard for measuring military stealth technology. The smaller the value, the better the stealth effect of the target.

[0003] Currently, there are three main methods to achieve RCS reduction technology. The first method is to change the shape of the target to deflect the RCS of the target by a certain angle to achieve RCS reduction. The disadvantage is that it is only useful in single station RCS. The second method is to coat the surface of the target object with radar absorbing material to convert the incident electromagnetic wave energy into heat energy to achieve RCS reduction. The disadvantage is that it will cause the temperature of the target object to rise, affecting the performance of the device, and the maintenance cost after coating is high and some absorbing materials are harmful to the human body. The third method is to use a metasurface array, which can effectively avoid the above problems by reflecting the incident electromagnetic wave as much as possible in all directions to achieve RSC reduction function.

[0004] With the development of antenna technology, multi-polarization and high-gain antennas are applied to receiving and transmitting systems to ensure communication or signal monitoring quality. This makes the traditional phase gradient RCS reduction method insufficient to achieve good stealth effect. At the same time, most of the current metasurface arrays are processed by printed circuit, and the working efficiency of the dielectric substrate in complex communication environment will be affected. Based on this, the present application proposes a multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution, which uses all-metal structure to improve the working efficiency of the metasurface array in complex communication environment, designs the array phase using hyperbolic phase distribution, and realizes effective RCS reduction. It has the advantages of high efficiency, high stability, simple and reliable system, low cost, etc., and is expected to be widely used in radar communication systems. SUMMARY

[0005] The present application provides a multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution, which has the advantages of high efficiency, high stability, simple and reliable system, low cost, etc.

[0006] To achieve the above object, the application provides the following technical scheme: a multi-polarization low-RCS full-metal reflection array based on hyperbolic phase distribution, the reflection array unit comprises an I-shaped metal column (1) and a metal floor (2) from top to bottom; the I-shaped metal column (1) is a three-dimensional structure and is arranged on the metal floor (2); the metal floor (2) is square and is arranged along the xoy plane; the I-shaped metal column (1) is arranged at an angle of +45° or -45° with the x-axis, can present two different electromagnetic responses with a phase difference of 180° for linearly polarized electromagnetic waves propagating along the z-axis with a polarization angle of 45° and 135°, and the two arrangement states are represented by binary digits “0” and “1”, and the corresponding phase electromagnetic responses are 0° and 180° respectively; the arrangement state of each reflection array unit is obtained according to the following steps: step 1: the ideal reflection phase of each reflection array unit to incident plane electromagnetic waves is set to

[0007]

[0008] wherein, is the ideal reflection phase of the reflection array unit at the mth row and the nth column to incident plane electromagnetic waves, k is a phase constant in vacuum, t is an RCS optimization factor, D is the aperture size of the reflection array, (x mn ,y mn ) is the coordinate of each unit when the array is arranged at the center of the xoy plane, is a constant; step two: the ideal reflection phase is normalized according to the phase period of 360° to obtain the normalized phase step three: the normalized phase is normalized with 0° and 180° to obtain the actual reflection phase When the normalized phase is 0°, the arrangement state of the reflection array unit is “0”, and vice versa. The reflection array units are uniformly arranged along the x and y axes to form a square shape, the corresponding coordinate of the center of each unit in the reflection array is substituted into the angle value calculated by the hyperbolic phase function, and then normalized to two phase electromagnetic states to obtain the arrangement state distribution of each I-shaped metal column (1) on the reflection array to realize array design; when the plane electromagnetic waves propagating along the -z axis direction irradiate on the reflection array, the RCS reduction performance with polarization conversion is realized for x-polarized and y-polarized incident electromagnetic waves, and the RCS reduction performance with polarization unchanged is realized for left-handed circularly polarized and right-handed circularly polarized incident electromagnetic waves.

[0009] Further, the I-shaped metal column (1) is obtained by cutting a semicircular column slot (3) symmetrical to the line with an angle of +45° or -45° along the x-axis, and the I-shaped column is placed along the x-axis with an angle of +45° or -45°; the I-shaped metal column (1) of the reflection array unit is set to state "0" along the x-axis with an angle of +45°, and presents electromagnetic responses with phases of 0° and 180° to linearly polarized electromagnetic waves with polarization angles of 45° and 135° respectively; the I-shaped metal column (1) of the reflection array unit is set to state "1" along the x-axis with an angle of -45°, and presents electromagnetic responses with phases of 180° and 0° to linearly polarized electromagnetic waves with polarization angles of 45° and 135° respectively.

[0010] Further, the reflection array unit has asymmetry along the x-axis and the y-axis; when an x-polarized electromagnetic wave propagating along the -z-axis direction irradiates on the reflection array composed of the reflection array unit, it can be decomposed into 45° and 135° polarized electromagnetic waves with the same phase and amplitude, and after phase regulation and reflection of the reflection array unit, it becomes 45° and 135° polarized electromagnetic waves with the same amplitude and a phase difference of 180°, and is synthesized into a y-polarized electromagnetic wave propagating along the +z direction; similarly, when a y-polarized electromagnetic wave propagating along the -z-axis direction irradiates on the reflection array, it becomes an x-polarized electromagnetic wave after phase regulation and reflection of the reflection array unit, and the reflection array has the performance of linear polarization conversion.

[0011] Further, when a left-handed circularly polarized electromagnetic wave propagating along the -z-axis direction irradiates on the reflection array, it can be decomposed into 45° and 135° polarized electromagnetic waves with the same amplitude and a phase difference of 90°, and after phase regulation and reflection of the reflection array unit, it becomes 45° and 135° polarized electromagnetic waves with the same amplitude and a phase difference of -90°, and is synthesized into a left-handed circularly polarized electromagnetic wave propagating along the +z direction; similarly, when a right-handed circularly polarized electromagnetic wave propagating along the -z-axis direction irradiates on the reflection array, it becomes a right-handed circularly polarized electromagnetic wave after phase regulation and reflection of the reflection array unit, and the reflection array has the performance of keeping the circular polarization unchanged.

[0012] Further, when an x-polarized plane electromagnetic wave is an incident wave, the main polarization and cross-polarization wave of the electromagnetic response of the reflection array unit are y-polarized and x-polarized waves respectively; when a y-polarized plane electromagnetic wave is an incident wave, the main polarization and cross-polarization wave of the electromagnetic response of the reflection array unit are x-polarized and y-polarized waves respectively; when a left-handed circularly polarized plane electromagnetic wave is an incident wave, the main polarization and cross-polarization wave of the electromagnetic response of the reflection array unit are left-handed circularly polarized and right-handed circularly polarized waves respectively; when a right-handed circularly polarized plane electromagnetic wave is an incident wave, the main polarization and cross-polarization wave of the electromagnetic response of the reflection array unit are right-handed circularly polarized and left-handed circularly polarized waves respectively; the main polarization and cross-polarization transmission coefficient amplitudes and phases of the electromagnetic response of the reflection array unit to the four kinds of plane incident wave are consistent.

[0013] Further, the setting state distribution of the reflection array unit changes with the change of the RCS optimization factor t, and the RCS value can be reduced by optimizing the optimization factor t.

[0014] Further, the height of the I-shaped metal column (1) and the metal floor (2) is 8mm and 0.8mm respectively, and the material is stainless steel, aluminum alloy or other metal with good conductivity.

[0015] Further, when the optimization factor t is set to 0.5 and the number of units is 32*32, the reflection array can achieve an RCS reduction level of-9.2dB for x-polarized electromagnetic waves, y-polarized electromagnetic waves, left-handed circularly polarized electromagnetic waves and right-handed circularly polarized electromagnetic waves propagating along the-zaxis at 5.8GHz.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1. The hyperbolic phase distribution based multi-polarization low RCS all-metal reflection array of the present application is made of metal as a whole, and the type of metal used is not limited, which can be customized according to different application scenarios, has high flexibility, low cost and other characteristics, and is easy to mass produce and large-scale application.

[0018] 2. The hyperbolic phase distribution based multi-polarization low RCS all-metal reflection array of the present application adopts an all-metal structure, which can avoid medium loss caused by bad weather, ensure the normal operation of the RCS function, and be applicable to special structures such as conformal structure, has high stability, high efficiency and wide application range, and is suitable for complex environment communication system.

[0019] 3. The hyperbolic phase distribution based multi-polarization low RCS all-metal reflection array of the present application uses hyperbolic phase function for phase design, has better RCS reduction level than traditional phase gradient method, and can realize RCS reduction function under multi-polarization, has high performance, simple and reliable system, and is suitable for radar communication system. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, wherein:

[0021] 1-I-shaped metal column, 2-metal floor, 3-semi-cylindrical slot.

[0022] Figure 1 is the front view of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflection array in the embodiment.

[0023] Figure 2is the main and cross polarization transmission amplitude plot of the unit of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in state "0" in the embodiment.

[0024] Figure 3 is the main and cross polarization transmission amplitude plot of the unit of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in state "1" in the embodiment.

[0025] Figure 4 is the main polarization transmission phase plot of the unit of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in two different states in the embodiment.

[0026] Figure 5 is the ideal and actual reflection phase distribution plot of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment at 5.8 GHz for each reflectarray unit to the incident plane electromagnetic wave .

[0027] Figure 6 is the three-dimensional RCS response plot of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment at 5.8 GHz in the state of x-plane electromagnetic wave incidence.

[0028] Figure 7 is the three-dimensional RCS response plot of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment at 5.8 GHz in the state of y-plane electromagnetic wave incidence.

[0029] Figure 8 is the three-dimensional RCS response plot of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment at 5.8 GHz in the state of left-handed circularly polarized plane electromagnetic wave incidence.

[0030] Figure 9 is the three-dimensional RCS response plot of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment at 5.8 GHz in the state of right-handed circularly polarized plane electromagnetic wave incidence.

[0031] Figure 10 is the normalized RCS response curve of the hyperbolic phase distribution based multi-polarization low RCS all-metal reflectarray in the embodiment with frequency in the state of plane electromagnetic wave incidence. DETAILED DESCRIPTION

[0032] ​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0033] The specific implementation provided by the present application is as follows:

[0034] Please refer to Figure 1 and Figure 5 , the present example provides a kind of based on hyperbolic phase distribution Multi-polarization low RCS full metal reflection array, the reflection array unit is from top to bottom including I-shaped metal column (1) and metal floor (2);The I-shaped metal column (1) is a three-dimensional structure, is arranged on metal floor (2);The metal floor (2) is square, is placed along xoy face;The I-shaped metal column (1) is placed at the angle +45 ° or-45 ° with x axis, can present two different electromagnetic responses of phase difference 180 ° to linearly polarized electromagnetic wave of polarization angle 45 ° and 135 ° propagating along z axis, two kinds of placement state are represented by binary digits "0" and "1", corresponding phase electromagnetic response is 0 ° and 180 ° respectively;The setting state of each reflection array unit is obtained according to the following steps: step 1: the ideal reflection phase of each reflection array unit to incident plane electromagnetic wave is set to according to hyperbolic phase function

[0035]

[0036] Wherein, The ideal reflection phase of the reflection array unit in the mth row and the nth column to incident plane electromagnetic wave, k is phase constant in vacuum, t is RCS optimization factor, D is the aperture size of reflection array, (x mn ,y mn ) is the coordinate of each unit when array is placed in the center of xoy face, Constant;Step two: the ideal reflection phase is normalized according to the phase period of 360 °, and the normalized phase in the range of [0 °, 360 °) is obtained Step three: the normalized phase And 0 ° and 180 ° are normalized to obtain actual reflection phase The setting state of the I-shaped metal column (1) is obtained by normalizing the angle value corresponding to the center of each unit in the reflection array to two phase electromagnetic states calculated by the hyperbolic phase function when the reflection array units are arranged in a square shape along the x and y axes; the RCS reduction performance with polarization conversion is realized for x-polarized and y-polarized incident electromagnetic waves, and the RCS reduction performance with polarization unchanged is realized for left-handed circularly polarized and right-handed circularly polarized incident electromagnetic waves. The I-shaped metal column (1) is obtained by cutting a semicircular slot (3) along the x-axis at an angle of +45° or -45°, and the I-shaped metal column is placed along the x-axis at an angle of +45° or -45°; the I-shaped metal column (1) of the reflection array unit is set to state "0" along the x-axis at an angle of +45°, and the electromagnetic response with a phase of 0° and 180° is presented for linearly polarized electromagnetic waves with polarization angles of 45° and 135°, respectively; the I-shaped metal column (1) of the reflection array unit is set to state "1" along the x-axis at an angle of -45°, and the electromagnetic response with a phase of 180° and 0° is presented for linearly polarized electromagnetic waves with polarization angles of 45° and 135°, respectively. The reflection array unit has asymmetry along the x-axis and the y-axis; when the x-polarized electromagnetic wave propagating along the -z-axis direction is incident on the reflection array composed of reflection array units, it can be decomposed into 45° and 135° polarized electromagnetic waves with the same phase and amplitude, which become 45° and 135° polarized electromagnetic waves with a phase difference of 180° and the same amplitude after phase regulation and reflection of the reflection array unit, and are combined into y-polarized electromagnetic wave propagating along the +z direction; similarly, when the y-polarized electromagnetic wave propagating along the -z-axis direction is incident on the reflection array, it becomes x-polarized electromagnetic wave after phase regulation and reflection of the reflection array unit, and the reflection array has the performance of linear polarization conversion. When the left-handed circularly polarized electromagnetic wave propagating along the -z-axis direction is incident on the reflection array, it can be decomposed into 45° and 135° polarized electromagnetic waves with a phase difference of 90° and the same amplitude, which become 45° and 135° polarized electromagnetic waves with a phase difference of -90° and the same amplitude after phase regulation and reflection of the reflection array unit, and are combined into left-handed circularly polarized electromagnetic wave propagating along the +z direction; similarly, when the right-handed circularly polarized electromagnetic wave propagating along the -z-axis direction is incident on the reflection array, it becomes right-handed circularly polarized electromagnetic wave after phase regulation and reflection of the reflection array unit, and the reflection array has the performance of circular polarization unchanged.When the x-polarized plane electromagnetic wave is the incident wave, the main polarization and cross polarization waves of the electromagnetic response of the reflection array unit are y-polarized and x-polarized waves respectively; when the y-polarized plane electromagnetic wave is the incident wave, the main polarization and cross polarization waves of the electromagnetic response of the reflection array unit are x-polarized and y-polarized waves respectively; when the left-handed circularly polarized plane electromagnetic wave is the incident wave, the main polarization and cross polarization waves of the electromagnetic response of the reflection array unit are left-handed circularly polarized and right-handed circularly polarized waves respectively; when the right-handed circularly polarized plane electromagnetic wave is the incident wave, the main polarization and cross polarization waves of the electromagnetic response of the reflection array unit are right-handed circularly polarized and left-handed circularly polarized waves respectively; the main polarization and cross polarization transmission coefficient amplitudes and phases of the electromagnetic response of the reflection array unit to the four kinds of plane incident waves are consistent. The setting state distribution of the reflection array unit changes with the change of the RCS optimization factor t, and the RCS value can be reduced by optimizing the optimization factor t. The heights of the I-shaped metal column (1) and the metal ground plate (2) are 8 mm and 0.8 mm respectively, and the materials are stainless steel, aluminum alloy or other metals with good conductivity. When the optimization factor t is set to 0.5 and the number of units is 32*32, the reflection array can realize the RCS reduction level of-9.2 dB for the x-polarized electromagnetic wave, the y-polarized electromagnetic wave, the left-handed circularly polarized electromagnetic wave and the right-handed circularly polarized electromagnetic wave propagating along the z-axis at 5.8 GHz.

[0037] In the application, the period p of each reflection unit is 16.5 mm; the radius of the I-shaped metal column (1) is 7.5 mm, and the height h is 8.0 mm; the height of the metal ground plate (2) is 0.8 mm; the length w and the width d of the semicylindrical slot (3) are 6.5 mm and 3.0 mm respectively; the aperture size D of the reflection array composed of 32*32 units is 528.0 mm.

[0038] As shown in Figure 2 The main polarization and cross polarization transmission coefficient amplitude curves of the electromagnetic response of the reflection array unit in the state "0" are given, and it can be seen that the main polarization transmission coefficient amplitude is higher than-0.5 dB in the simulation frequency band, and the cross polarization transmission amplitude is lower than-10.0 dB in the simulation frequency band.

[0039] As shown in Figure 3 The main polarization and cross polarization transmission coefficient amplitude curves of the electromagnetic response of the reflection array unit in the state "1" are given, and it can be seen that the main polarization transmission coefficient amplitude is higher than-0.5 dB in the simulation frequency band, and the cross polarization transmission amplitude is lower than-10.0 dB in the simulation frequency band.

[0040] As shown in Figure 4 The main polarization transmission phase curves of the electromagnetic response of the reflection array unit in the state "0" and the state "1" are given, and it can be seen that the transmission phase curves in the two states change linearly, and the phase difference in the whole simulation frequency band is 180°.

[0041] As Figure 6 The three-dimensional RCS response graph of the reflection array under the irradiation of x polarization plane incident wave at 5.8 GHz is given, and it can be seen that most of the x polarization incident electromagnetic waves are converted into y polarization outgoing electromagnetic waves, and the RCS reduction level is 9.2 dB.

[0042] As Figure 7 The three-dimensional RCS response graph of the reflection array under the irradiation of y polarization plane incident wave at 5.8 GHz is given, and it can be seen that most of the y polarization incident electromagnetic waves are converted into x polarization outgoing electromagnetic waves, and the RCS reduction level is 9.2 dB.

[0043] As Figure 8 The three-dimensional RCS response graph of the reflection array under the irradiation of left-handed circular polarization plane incident wave at 5.8 GHz is given, and it can be seen that most of the left-handed circular polarization incident electromagnetic waves are maintained as left-handed circular polarization outgoing electromagnetic waves, and the RCS reduction level is 9.2 dB.

[0044] As Figure 9 The three-dimensional RCS response graph of the reflection array under the irradiation of right-handed circular polarization plane incident wave at 5.8 GHz is given, and it can be seen that most of the right-handed circular polarization incident electromagnetic waves are maintained as right-handed circular polarization outgoing electromagnetic waves, and the RCS reduction level is 9.2 dB.

[0045] As Figure 10 The normalized RCS response graph of the reflection array is given, and it can be seen that the reflection array realizes an RCS reduction level greater than 8.9 dB in the simulation frequency band, and the maximum RCS reduction level is 16.7 dB.

[0046] From the above, the present application has the characteristics of high efficiency, high stability, simple and reliable system, and low cost.

[0047] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be limited by the protection scope of the claims.

Claims

1. A multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution, wherein the unit of the reflective array comprises an I-shaped metal column (1) and a metal floor (2) from top to bottom; the I-shaped metal column (1) is a three-dimensional structure and is set on the metal floor (2); the metal floor (2) is square and is placed along the xoy plane; the I-shaped metal column (1) is placed at an angle of +45° or -45° with the x-axis, and exhibits two different electromagnetic responses with a phase difference of 180° for linearly polarized electromagnetic waves propagating along the z-axis with polarization angles of 45° and 135°, the two placement states are represented by binary numbers "0" and "1", and the corresponding phase electromagnetic responses are 0° and 180°, respectively; the setting state of each reflective array unit is obtained according to the following steps: Step 1: The ideal reflection phase of each reflective array unit for the incident plane electromagnetic wave is set according to the hyperbolic phase function. in, Let be the ideal reflection phase of the incident plane electromagnetic wave for the m-th row and n-th column of the reflective array element, k be the phase constant in vacuum, t be the RCS optimization factor, and D be the aperture size of the reflective array. mn ,y mn () represents the coordinates of each element when the array is placed at the center of the xoy plane. The first step is to normalize the ideal reflection phase according to a 360° phase period, resulting in a normalized phase ranging from [0° to 360°). Step 3: Normalize the phase The actual reflection phase is obtained by normalizing with 0° and 180°. When the normalized phase is 0°, the setting state of the reflective array unit is "0", otherwise it is the setting state "1". The reflective array units are arranged in a square shape along the x and y axes. The coordinates corresponding to the center of each unit in the reflective array are substituted into the angle value calculated by the hyperbolic phase function and normalized to two phase electromagnetic states to obtain the placement state distribution of each I-shaped metal column (1) on the reflective array to realize the array design. When the plane electromagnetic wave propagating along the -z axis irradiates the reflective array, it achieves RCS reduction performance with polarization conversion for x-polarized and y-polarized incident electromagnetic waves, and achieves RCS reduction performance with polarization unchanged for left-hand circularly polarized and right-hand circularly polarized incident electromagnetic waves.

2. The multi-polarization low RCS all-metal reflection array based on hyperbolic phase distribution according to claim 1, characterized in that, The I-shaped metal column (1) is obtained by removing a semi-cylindrical slot (3) symmetrically arranged along the x-axis at an angle of +45° or -45°. The I-shaped column is placed along the x-axis at an angle of +45° or -45°. The I-shaped metal column (1) of the reflective array unit is set to state "0" at an angle of +45° along the x-axis, and exhibits electromagnetic responses with phases of 0° and 180° for linearly polarized electromagnetic waves with polarization angles of 45° and 135°, respectively. The I-shaped metal column (1) of the reflective array unit is set to state "1" at an angle of -45° along the x-axis, and exhibits electromagnetic responses with phases of 180° and 0° for linearly polarized electromagnetic waves with polarization angles of 45° and 135°, respectively.

3. The multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution according to claim 1, characterized in that, The reflective array unit is asymmetrical along the x-axis and y-axis. When an x-polarized electromagnetic wave propagating along the -z-axis irradiates the reflective array composed of reflective array units, it is decomposed into electromagnetic waves with the same phase and amplitude at 45° and 135°. After phase modulation and reflection by the reflective array unit, it becomes electromagnetic waves with a phase difference of 180° and the same amplitude at 45° and 135°, which are then synthesized into y-polarized electromagnetic waves propagating along the +z-axis. Similarly, when a y-polarized electromagnetic wave propagating along the -z-axis irradiates the reflective array, it becomes x-polarized electromagnetic waves after phase modulation and reflection by the reflective array unit. The reflective array has the performance of linear polarization transformation.

4. The multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution according to claim 1, characterized in that, When a left-hand circularly polarized electromagnetic wave propagating along the -z axis irradiates the reflective array, it is decomposed into electromagnetic waves with a phase difference of 90° and the same amplitude of 45° and 135°. After phase modulation and reflection by the reflective array unit, it becomes electromagnetic waves with a phase difference of -90° and the same amplitude of 45° and 135°, which are then synthesized into a left-hand circularly polarized electromagnetic wave propagating along the +z direction. Similarly, when a right-hand circularly polarized electromagnetic wave propagating along the -z axis irradiates the reflective array, it becomes a right-hand circularly polarized electromagnetic wave after phase modulation and reflection by the reflective array elements. The reflective array has the property of maintaining circular polarization.

5. The multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution according to any one of claims 1-4, characterized in that, When the x-polarized plane electromagnetic wave is the incident wave, the main polarization and cross-polarization waves of the electromagnetic response of the reflection array unit are y-polarized and x-polarized waves, respectively; when the y-polarized plane electromagnetic wave is the incident wave, the main polarization and cross-polarization waves of the electromagnetic response of the reflection array unit are x-polarized and y-polarized waves, respectively; when the left-hand circularly polarized plane electromagnetic wave is the incident wave, the main polarization and cross-polarization waves of the electromagnetic response of the reflection array unit are left-hand circularly polarized and right-hand circularly polarized waves, respectively; when the right-hand circularly polarized plane electromagnetic wave is the incident wave, the main polarization and cross-polarization waves of the electromagnetic response of the reflection array unit are right-hand circularly polarized and left-hand circularly polarized waves, respectively; the amplitude and phase of the main polarization and cross-polarization transmission coefficients of the electromagnetic response of the reflection array unit for the four types of plane incident waves are consistent.

6. The multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution according to claim 1, characterized in that, The configuration state distribution of the reflection array units changes with the change of the RCS optimization factor t, and the RCS value is reduced by optimizing the optimization factor t.

7. The multi-polarization low RCS all-metal reflective array based on hyperbolic phase distribution according to claim 1, characterized in that, The I-shaped metal column (1) and the metal floor (2) are 8mm and 0.8mm high, respectively, and are made of stainless steel, aluminum alloy or other metals with good electrical conductivity.

8. The multi-polarization low RCS all-metal reflection array based on hyperbolic phase distribution according to claim 1, characterized in that, When the optimization factor t is set to 0.5 and the number of units is 32×32, the reflective array achieves an RCS reduction level of -9.2dB for x-polarized electromagnetic waves, y-polarized electromagnetic waves, left-hand circularly polarized electromagnetic waves, and right-hand circularly polarized electromagnetic waves propagating along the -z axis at 5.8GHz.

Images