Super-homogeneous radiation-scattering synergistic super-structure array plane for large-angle strong scattering suppression

Abstract

The invention discloses a super-homogeneous radiation-scattering collaborative super-structure array plane for large-angle strong scattering suppression. The array plane is composed of a plurality of radiation-scattering collaborative super-structure units which are arranged in a super-homogeneous mode. A U-shaped groove patch antenna and a loss layer of a loading resistor are combined to form a super-structure unit with functions of regulating radiation and scattering, and all the units are arranged by adopting super-homogeneous distribution. By means of the design, good in-band radiation performance is kept, and meanwhile out-of-band scattering under the grazing incidence condition is effectively restrained. The super-homogeneous radiation-scattering synergistic super-structure array plane has the characteristics close to an ideal periodic array, avoids the common Bragg peak phenomenon in the periodic array, and is similar to a random distribution array without Bragg peaks. The super-homogeneous radiation and scattering synergistic super-structure array plane provides a new design idea for stealth application of a periodic / non-periodic antenna array in a grazing incidence condition in the future, and has a wide application prospect, especially in the technical field of equipment stealth and low scattering.

Description

Technical Field

[0001] The present invention relates to a homogeneous radiation-scattering collaborative metasurface for suppressing large-angle strong scattering, belonging to the technical field of equipment stealth and low-scattering technology. Background Art

[0002] In recent years, with the rapid development of wireless detection and communication technologies, especially their applications on airborne platforms, the demand for low-scattering antennas and antenna arrays has been increasing. As a two-dimensional form of artificial electromagnetic metamaterials, metasurfaces have unique electromagnetic properties and the structural advantage of a low profile, and have been widely used in the field of electromagnetic stealth. By integrating metasurfaces with antennas / arrays, a high degree of integration of electromagnetic stealth windows and antennas / arrays can be achieved, thereby improving the radiation and scattering characteristics of antennas. However, most current studies on low-scattering antennas / antenna arrays mainly focus on the scattering characteristics under normal incidence of radar waves, and there is a lack of research on scattering under grazing incidence. The grazing incidence of radar waves on a periodic array is likely to cause the phenomenon of traveling wave diffraction, resulting in large-angle strong scattering and making the target more easily monitored. Therefore, how to design an antenna array that can not only maintain good radiation performance but also effectively reduce out-of-band scattering under grazing incidence remains a major technical problem in the current field of electromagnetic stealth. Summary of the Invention

[0003] Technical Problem: The purpose of the present invention is to provide a homogeneous radiation-scattering collaborative metasurface for suppressing large-angle strong scattering, which can significantly reduce out-of-band scattering under grazing incidence while ensuring in-band radiation performance, providing a new idea for stealth applications under grazing incidence of radar waves.

[0004] Technical Solution: To achieve the above invention purpose, the present invention provides a homogeneous radiation-scattering collaborative metasurface for suppressing large-angle strong scattering, including a plurality of radiation-scattering collaborative metasurface units arranged in a homogeneous manner; each of the radiation-scattering collaborative metasurface units includes a loss layer, a first dielectric substrate, a second dielectric substrate, a U-shaped groove patch layer, a third dielectric substrate, and a metal ground layer arranged in sequence from top to bottom. The U-shaped groove patch layer and the third dielectric substrate are connected by metal posts. The metal posts are located at the center of the third dielectric substrate, penetrate the third dielectric substrate, and the metal posts are not connected to the metal ground layer. The large-angle incidence range is from 60° to 85°.

[0005] Furthermore, the loss layer includes N*N square metal patches distributed periodically, N*N rectangular ring metal patches distributed periodically, and 4*N*N patch resistors; each of the rectangular ring metal patches has four gaps arranged in a centrosymmetric distribution on its four sides, and a patch resistor is provided in each gap; the square metal patches are centrosymmetrically located inside the rectangular ring metal patches.

[0006] Furthermore, both the first dielectric substrate and the third dielectric substrate are F4B dielectric substrates.

[0007] Furthermore, the second dielectric substrate is a PMI foam substrate.

[0008] Furthermore, the metal structural material of the radiation-scattering collaborative metasurface unit is copper.

[0009] Furthermore, the operating frequency band of the radiation characteristics of the radiation-scattering collaborative metasurface unit is 2.9 - 3.1 GHz, and the average gain is greater than 6 dBi.

[0010] Furthermore, the operating frequency band of the scattering characteristics of the radiation-scattering collaborative metasurface unit is 8 - 12 GHz.

[0011] Furthermore, the operating frequency band of the radiation characteristics of the super-homogeneous radiation-scattering collaborative metasurface is 2.9 - 3.1 GHz, and the maximum gain is 18 dBi.

[0012] Furthermore, the operating frequency band of the scattering characteristics of the super-homogeneous radiation-scattering collaborative metasurface is 8 - 12 GHz. In the case of large-angle incidence, the average radar cross-section reduction is about 6 dB. At 11.1 GHz, the maximum radar cross-section reduction is 26 dB.

[0013] The super-homogeneous distribution is used to optimize the arrangement of the radiation-scattering collaborative metasurface units. By adopting this distribution, the strong scattering phenomenon in a large-angle range can be effectively suppressed. Specifically, the super-homogeneous distribution is between the random distribution and the periodic distribution, and has the radiation-scattering characteristics of both. By optimizing the geometric arrangement of the radiation-scattering collaborative units, the structure factor in the Fourier space approaches zero within a specific wave vector range, that is, ensuring that the scattering characteristics of the super-homogeneous distribution array are consistent with those of the random distribution array, and the effect of suppressing strong scattering in the large-angle range of 60° to 85° can be achieved.

[0014] Advantageous effects. Compared with the prior art, the technical solution of the present invention has the following advantageous technical effects:

[0015] (1) The super-homogeneous radiation-scattering collaborative metasurface provided by the present invention for suppressing strong scattering at large angles can ensure the in-band radiation performance while significantly reducing the out-of-band scattering under grazing incidence, providing a new idea for stealth applications under grazing incidence of radar waves.

[0016] (2) The present invention can effectively suppress out-of-band scattering in the case of grazing incidence while maintaining good in-band radiation performance. Traditional periodic arrays are prone to diffraction phenomena when facing grazing-incidence radar waves, and these phenomena usually cause the scattering characteristics of the target to be amplified, increasing the risk of being monitored. The hyper-homogeneous radiation scattering collaborative metasurface eliminates the typical diffraction peak phenomenon in the periodic array by non-periodic distribution, integrating the characteristics of periodic arrays and random distributions without Bragg peaks. This innovative design not only optimizes the scattering performance but also greatly improves the stealth performance of the target under grazing incidence. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the hyper-homogeneous radiation scattering collaborative metasurface for large-angle strong scattering suppression;

[0019] Figure 2 Schematic diagram of the structure of the radiation scattering collaborative metasurface unit;

[0020] Figure 3 S-parameter and gain state diagram of the radiation scattering collaborative metasurface unit;

[0021] Figure 4 Far-field radiation pattern of the radiation scattering collaborative metasurface unit;

[0022] Figure 5 Absorbing state diagram of the radiation scattering collaborative metasurface unit;

[0023] Figure 6 S-parameter and gain state diagram of the hyper-homogeneous radiation scattering collaborative metasurface;

[0024] Figure 7 Radiation pattern of the hyper-homogeneous radiation scattering collaborative metasurface;

[0025] Figure 8 Grazing-incidence scattering state diagram of the hyper-homogeneous radiation scattering collaborative metasurface;

[0026] Figure 9 Enlarged schematic diagram of the loss layer.

[0027] Symbol description: 1 - Hyper - homogeneous radiation - scattering collaborative meta - surface, 2 - Radiation - scattering collaborative meta - unit, 3 - Loss layer, 4 - Rectangular - ring metal patch, 5 - Square metal patch, 6 - First dielectric substrate, 7 - Second dielectric substrate, 8 - U - shaped groove patch layer, 9 - Third dielectric substrate, 10 - Metal column, 11 - Metal ground layer. Detailed implementation manners

[0028] Illustrate by way of example according to the content included in the claims.

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The object of the present invention is to provide a hyper - homogeneous radiation - scattering collaborative meta - surface for large - angle strong - scattering suppression, which can significantly reduce the out - of - band scattering under grazing incidence while ensuring the in - band radiation performance, providing a new idea for the stealth application under the grazing incidence of radar waves.

[0031] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0032] As Figure 1 shown, a hyper - homogeneous radiation - scattering collaborative meta - surface 1 for large - angle strong - scattering suppression provided by the present invention includes a plurality of radiation - scattering collaborative meta - units 2 arranged in a hyper - homogeneous manner. As Figure 2 shown, each of the radiation - scattering collaborative meta - units 2 includes a loss layer 3, a first dielectric substrate 6, a second dielectric substrate 7, a U - shaped groove patch layer 8, a third dielectric substrate 9, a metal column 10, and a metal ground layer 11 arranged in sequence from top to bottom; the loss layer 3 includes 5 * 5 square metal patches 5 distributed periodically, 5 * 5 rectangular - ring metal patches 4 distributed periodically, and 100 patch resistors; each of the rectangular - ring metal patches 4 is connected in series with 4 of the patch resistors; the U - shaped groove patch metal layer 8 is connected to the third dielectric substrate 9 through the metal column 10, the metal column 10 is located at the center of the third dielectric substrate, the metal column 10 penetrates the third dielectric substrate, and the metal column 10 is not connected to the metal ground layer 11.

[0033] The metal structure material of the radiation - scattering collaborative meta - unit is copper, and other metal materials can also be selected. The first dielectric substrate 6 and the third dielectric substrate 9 are both F4B dielectric substrates, and the second dielectric substrate 7 is a PMI foam substrate.

[0034] As Figure 3 shown, the operating frequency band of the radiation and scattering collaborative metasurface unit 2 for radiation characteristics is 2.9 - 3.1 GHz and the average gain is greater than 6 dBi. The far-field pattern results are as Figure 4 shown. The operating frequency band of the radiation and scattering collaborative metasurface unit 2 for scattering characteristics is 8 - 12 GHz. In the case of normal incidence, the average wave absorption rate > 80%. When the incident angle increases, its wave absorption rate deteriorates severely, as Figure 5 shown. Therefore, the super-homogeneous radiation and scattering collaborative metasurface 1 is generated by combining the super-homogeneous distribution for scattering suppression in the case of grazing incidence.

[0035] As Figure 6 shown, the operating frequency band of the super-homogeneous radiation and scattering collaborative metasurface 1 for radiation characteristics is 2.9 - 3.1 GHz and the maximum gain is 18 dBi. The far-field pattern results are as Figure 7 shown.

[0036] Figure 8 The scattering characteristics of the super-homogeneous radiation and scattering collaborative metasurface 1 and an equal-sized reference array in the case of grazing incidence are given, and the operating frequency band is 8 - 12 GHz. As Figure 8 shown, the scattering performance of the super-homogeneous radiation and scattering collaborative metasurface 1 is lower than that of the equal-sized reference array throughout the operating frequency band. The average RCS reduction is about 6 dB. At 11.1 GHz, the maximum RCS reduction is 26 dB.

[0037] Working principle: The super-homogeneous radiation and scattering collaborative metasurface adopts a special distribution method to break the regularity of the periodic structure, thereby avoiding strong diffraction peaks caused by periodicity in the case of grazing incidence.

[0038] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0039] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A hyper-homogeneous radiation scattering cooperative meta-front for large-angle strong scattering suppression, characterized in that, The array surface includes multiple radiation-scattering cooperative meta-units arranged in a super-homogeneous manner; each radiation-scattering cooperative meta-unit includes a loss layer, a first dielectric substrate, a second dielectric substrate, a U-shaped groove patch layer, a third dielectric substrate, and a metal ground layer arranged in sequence from top to bottom. The U-shaped groove patch layer and the third dielectric substrate are connected by metal posts. The metal posts are located at the center of the third dielectric substrate, penetrate the third dielectric substrate, and are not connected to the metal ground layer. The large-angle incident range is from 60° to 85°.

2. The ultra-homogeneous radiation scattering collaborative meta-surface for large-angle strong scattering suppression according to claim 1, wherein The loss layer includes N*N square metal patches distributed periodically, N*N rectangular ring metal patches distributed periodically, and 4*N*N patch resistors; four slits are provided on the four sides of each rectangular ring metal patch, and a patch resistor is provided in each slit; the square metal patches are symmetrically located at the center of the rectangular ring metal patches, and N is a positive integer.

3. The meta-array for suppressing large-angle strong scattering with synergistic radiation scattering according to claim 1, wherein Both the first dielectric substrate and the third dielectric substrate are F4B dielectric substrates.

4. The super-homogeneous radiation scattering collaborative meta-surface for large-angle strong scattering suppression according to claim 1, wherein The second dielectric substrate is a PMI foam substrate.

5. The super-homogeneous radiation scattering collaborative meta-surface for large-angle strong scattering suppression according to claim 1, characterized in that The metal structure material of the radiation-scattering cooperative meta-unit is copper.

6. The super-homogeneous radiation scattering cooperative meta-surface for large-angle strong scattering suppression according to claim 1, wherein The radiation characteristic operating frequency band of the radiation-scattering cooperative meta-unit is 2.9 - 3.1 GHz, and the average gain is greater than 6 dBi.

7. The meta-homogeneous radiation scattering collaborative meta-array surface for large-angle strong scattering suppression according to claim 1, wherein The scattering characteristic operating frequency band of the radiation-scattering cooperative meta-unit is 8 - 12 GHz.

8. The meta-homogeneous radiation scattering collaborative meta-surface for large-angle strong scattering suppression according to claim 1, wherein The radiation characteristic operating frequency band of the super-homogeneous radiation-scattering cooperative meta-array surface is 2.9 - 3.1 GHz, and the maximum gain is 18 dBi.

9. The super-homogeneous radiation scattering collaborative metasurface for large-angle strong scattering suppression according to claim 1, wherein The scattering characteristic operating frequency band of the super-homogeneous radiation-scattering cooperative meta-array surface is 8 - 12 GHz.

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