Periodic gradient wave-absorbing structure with optimized two-support one-suspension low scattering performance

Abstract

The invention discloses a periodic gradient wave-absorbing structure for optimizing low scattering performance of two supports and one hanger, which comprises two supports and one hanger, and a periodic gradient wave-absorbing structure is loaded on the periphery of the two supports and one hanger to jointly form a low scattering appearance; the periodic gradually-changing wave absorbing structure is formed by stacking flying-saucer-shaped wave absorbing units with gradually-changing widths and heights in the vertical direction, electromagnetic waves are periodically subjected to multiple times of scattering loss absorption between the flying-saucer-shaped wave absorbing units, and the sizes of the flying-saucer-shaped wave absorbing units are gradually changed, so that phase differences are formed by reflection echoes of different flying-saucer-shaped wave absorbing units. According to the invention, the scattering level of the two supports and one hanger in an L wave band to a Ku wave band and even a higher frequency wave band is effectively optimized, the coupling scattering between the two supports and one hanger and a tested target is reduced, the darkroom test precision is improved, and the test requirements of more stealth targets can be met.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic measurement, and in particular to a periodically gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension. Background Art

[0002] Microwave anechoic chambers primarily simulate electromagnetically interference-free free space through metal shielding and absorbing materials, and are widely used in high-precision tests such as stealth performance testing, antenna performance testing, and electronic product testing. A two-bracket, one-sling support system is a crucial component of the support system for large-scale radar cross-section test systems. Its primary function is to connect to the target under test (such as an aircraft) via two brackets and a sling, enabling three-point fixation and attitude adjustment. This supports the target within the quiet zone and enables rotation and pitch movements, mimicking the target's actual operating state, meeting the requirements for multi-angle and multi-attitude RCS measurements. Accurate RCS measurements require the background level to be at least 20dB lower than the target's RCS level, placing high demands on the low-scattering capabilities of the two-bracket, one-sling system.

[0003] At present, the existing technology of two-mounted aerial surveillance systems generally has the problem of difficulty in reducing the scattering level, and the coupled scattering between the target and the two-mounted aerial surveillance systems is difficult to eliminate using traditional background cancellation technology. This will cause interference with the quiet zone performance and greatly limit the test accuracy of the target radar scattering cross section.

[0004] Chinese invention patent publication number CN119179056A proposes a method for reducing the RCS of a low-scattering metal bracket. This method combines and loads three different absorbing materials onto the outer surface of the bracket to reduce the RCS. The three absorbing materials are specifically an absorbing coating layer, a metamaterial layer, and a hard absorbing material layer. However, the absorbing materials are ovoid, teardrop-shaped, or jujube-shaped, which does not create phase differences between the reflected echoes of different absorbing elements, thereby preventing the superposition of scattering from each element. Summary of the Invention

[0005] The present invention solves the technical problem of how to optimize the scattering level of two-branch and one-hang, and proposes a periodic gradient absorbing structure that optimizes the low scattering performance of two-branch and one-hang. Furthermore, a periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one hanger includes two supports and one hanger, and the two supports and one hanger include two supports and one hanger rope. The outer periphery of the two supports and one hanger is loaded with a periodic gradient absorbing structure to form a low scattering shape. Among them, the periodic gradient absorbing structure loaded on the periphery of the two-branch and one-hang can significantly optimize the low scattering performance of the two-branch and one-hang in the L-band to Ku-band and even higher frequency bands.

[0006] Furthermore, a periodic gradient absorbing structure is provided for optimizing the low scattering performance of two supports and one suspension, wherein the flying saucer-shaped absorbing units are connected by mortise and tenon structure.

[0007] Furthermore, a periodic gradient absorbing structure is provided for optimizing the low scattering performance of two supports and one suspension, wherein the flying saucer-shaped absorbing units are connected by direct bonding.

[0008] Among them, mortise and tenon structure splicing or direct bonding is simple to implement and easy to process.

[0009] Furthermore, a periodic gradient absorbing structure is provided for optimizing the low-scattering performance of two-branch-one-hanging devices. The periodic gradient absorbing structure is composed of vertically stacked flying saucer-shaped absorbing units with gradually varying widths and heights. The electromagnetic waves are periodically absorbed through multiple scattering losses between the flying saucer-shaped absorbing units. The gradual variation in the size of the flying saucer-shaped absorbing units causes phase differences in the reflected echoes from different flying saucer-shaped absorbing units. Among them, the reflected echoes of different flying saucer-shaped absorbing units form a phase difference to avoid the scattering superposition of each flying saucer-shaped absorbing unit; Furthermore, a periodic gradient absorbing structure is provided for optimizing the low scattering performance of two supports and one suspension, wherein the absorbing material of the periodic gradient absorbing structure is a hard absorbing material, and the hard absorbing material is integrally formed from a foamed conductive mixture.

[0010] Furthermore, a periodic gradient absorbing structure is provided for optimizing the low scattering performance of two branches and one hanger, wherein the conductive mixture is formed by melt blending polypropylene, high molecular polymer and conductive agent.

[0011] Furthermore, a periodic gradient absorbing structure that optimizes the low scattering performance of two branches and one hanger, wherein the high molecular polymer is selected from one or more of polystyrene, ethylene-vinyl acetate copolymer, polylactic acid, polycarbonate, polyamide, polyetheretherketone, and polyimide.

[0012] Furthermore, a periodic gradient absorbing structure that optimizes the low scattering performance of two supports and one hanger, wherein the conductive agent is selected from one or more of graphite, scaly graphite, carbon black, highly conductive carbon black, acetylene black, nano carbon black particles, carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, carbon nanofibers, graphite nanosheets, graphene, single-layer graphene, few-layer graphene, multi-layer graphene, nickel-coated graphite powder, nickel-coated carbon fiber carbon black, metal powder, liquid metal, flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder, and flaky iron-nickel alloy powder.

[0013] The beneficial effects of the present invention are as follows: by loading a periodic gradient absorbing structure on the periphery of the two supports and one hanger, the scattering level of the two supports and one hanger in the L band to the Ku band and even higher frequency bands is effectively optimized, the coupled scattering between the two supports and one hanger and the target under test is reduced, the darkroom test accuracy is improved, and the test requirements of more stealth targets can be met; the periodic gradient absorbing structure is light in weight, easy to process, transport, install and maintain, low in cost, and does not affect the mechanical properties of the metal bracket itself; it is simple to implement, has strong operability, and can upgrade and optimize the existing two supports and one hanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a periodic gradient absorbing structure for optimizing the low-scattering performance of two-branch and one-hang.

[0015] Figure 2 This is the RCS simulation effect diagram of horizontal polarization in the L-Ku band.

[0016] Figure 3 This is the RCS simulation effect diagram of vertical polarization in the L-Ku band.

[0017] In the figure, 1- bracket, 2- hanging rope, 3- periodic gradient absorbing structure, 4- low scattering shape, 5- flying saucer shaped absorbing unit. DETAILED DESCRIPTION

[0018] The present invention is further described below, but the protection scope of the present invention is not limited to the following description.

[0019] As attached Figure 1 As shown, a periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one hanger includes two supports and one hanger, and the two supports and one hanger include two brackets 1 and a hanging rope 2. It is characterized in that the periphery of the two supports and one hanger is loaded with a periodic gradient absorbing structure 3, which together form a low scattering shape 4.

[0020] Among them, two supports and one hanger are made of metal.

[0021] The periodic gradient absorbing structure 3 is composed of flying saucer-shaped absorbing units 5 with gradient width and height stacked in the vertical direction. The electromagnetic waves are periodically absorbed through multiple scattering losses between the flying saucer-shaped absorbing units 5. The gradient size of the flying saucer-shaped absorbing units 5 causes the reflected echoes of different flying saucer-shaped absorbing units 5 to form a phase difference.

[0022] Among them, the periodic gradient absorbing structure 3 can significantly optimize the low-scattering performance of the two-branch and one-hanger in the L-band to Ku-band and even higher frequency bands, improve the quality of the darkroom quiet zone and background level, and significantly improve the test capability and test accuracy of the radar scattering cross-section test system.

[0023] The dish-shaped absorbing units 5 are connected by mortise and tenon joints or by direct bonding.

[0024] The absorbing material of the periodic gradient absorbing structure 3 is a hard absorbing material, which is integrally formed from a foamed conductive mixture.

[0025] The conductive mixture is formed by melt-blending polypropylene, high molecular polymer and conductive agent.

[0026] The high molecular polymer is selected from one or more of polystyrene, ethylene-vinyl acetate copolymer, polylactic acid, polycarbonate, polyamide, polyetheretherketone, and polyimide.

[0027] The conductive agent is selected from one or more of graphite, scaly graphite, carbon black, highly conductive carbon black, acetylene black, nano carbon black particles, carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, carbon nanofibers, graphite nanosheets, graphene, single-layer graphene, few-layer graphene, multi-layer graphene, nickel-coated graphite powder, nickel-coated carbon fiber carbon black, metal powder, liquid metal, flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder, and flaky iron-nickel alloy powder.

[0028] As attached Figure 2 As shown in the figure, after loading the periodic gradient absorbing structure 3, the horizontal polarization RCS of the suspension rope 1 and the bracket 2 is reduced by 1.6-20dB in the L band, 20-25dB in the S band, 25-35dB in the C band, 35-45dB in the X band, and 40-50dB in the Ku band, and the low-scattering performance is significantly optimized.

[0029] As attached Figure 3 As shown in the figure, after loading the periodic gradient absorbing structure 3, the vertical polarization RCS of the suspension rope 1 and the bracket 2 is reduced by 18-35dB in the L band, 35-40dB in the S band, 35-40dB in the C band, 35-45dB in the X band, and 45-50dB in the Ku band, and the low-scattering performance is significantly optimized.

[0030] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one hanger, comprising two supports and one hanger, the two supports and one hanger comprising two supports (1) and one hanger rope (2), characterized in that: The two supports and one suspension are peripherally loaded with a periodic gradient absorbing structure (3), which together form a low scattering shape (4).

2. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 1 is characterized in that: The periodic gradient absorbing structure (3) is composed of flying saucer-shaped absorbing units (5) with gradient width and height stacked in the vertical direction, and periodically causes electromagnetic waves to be absorbed through multiple scattering losses between the flying saucer-shaped absorbing units (5). The gradient size of the flying saucer-shaped absorbing units (5) causes reflected echoes from different flying saucer-shaped absorbing units (5) to form phase differences.

3. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 2 is characterized in that: The flying saucer-shaped wave absorbing units (5) are connected by mortise and tenon joints.

4. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 2, characterized in that: The flying saucer-shaped absorbing units (5) are connected by direct bonding.

5. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 1 is characterized in that: The absorbing material of the periodic gradient absorbing structure (3) is a hard absorbing material, and the hard absorbing material is integrally formed from a foamed conductive mixture.

6. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 5, characterized in that: The conductive mixture is formed by melt-blending polypropylene, high molecular polymer and conductive agent.

7. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 6, characterized in that: The high molecular polymer is selected from one or more of polystyrene, ethylene-vinyl acetate copolymer, polylactic acid, polycarbonate, polyamide, polyetheretherketone, and polyimide.

8. The periodic gradient absorbing structure for optimizing the low scattering performance of two supports and one suspension according to claim 6, characterized in that: The conductive agent is selected from one or more of graphite, scaly graphite, carbon black, highly conductive carbon black, acetylene black, nano carbon black particles, carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, carbon nanofibers, graphite nanosheets, graphene, single-layer graphene, few-layer graphene, multi-layer graphene, nickel-coated graphite powder, nickel-coated carbon fiber carbon black, metal powder, liquid metal, flaky iron-based metal powder, flaky iron-based alloy powder, flaky iron-silicon-aluminum alloy powder, flaky iron-silicon alloy powder, flaky iron-silicon-chromium alloy powder, flaky cobalt-based alloy powder, and flaky iron-nickel alloy powder.

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