A high-transmission-wave bulletproof beidou antenna cover structure and a beidou antenna device

Abstract

This solution belongs to the field of antenna technology, disclosing a high-transmittance, bulletproof BeiDou radome structure and BeiDou antenna equipment. The radome structure includes an aramid radome and a metal ring. The aramid radome is a 7-9mm thick structure made of aramid III fiber composite material, with a cavity for accommodating the BeiDou antenna and an opening for the antenna to enter the cavity. The metal ring is a ring-shaped structure made of hard aluminum alloy, nested within the opening. While maintaining the original electrical performance of traditional BeiDou radomes, the overall mechanical strength of the radome is improved, and bulletproof functionality is added, meeting the Level II bulletproof requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests," effectively enhancing the equipment's survivability on the battlefield. Bulletproofing and high transmission are simultaneously achieved, making it widely applicable to outdoor antenna equipment such as BeiDou short message antennas, BeiDou navigation antennas, and BeiDou high-precision antennas, especially suitable for use in harsh environments and military BeiDou navigation antenna equipment requiring bulletproof protection.

Description

Technical Field

[0001] This solution belongs to the field of antenna technology, specifically involving a high-transparency bulletproof BeiDou radome structure, which can be widely used in outdoor antenna equipment such as BeiDou short message antennas, BeiDou navigation antennas, and BeiDou high-precision antennas. Background Technology

[0002] With the development of modern warfare weapon systems, exposed antennas are now severely threatened by various weapons. In particular, fragments and shockwaves from explosions on the battlefield can easily damage antennas, affecting their usability. Currently, existing radomes in China only protect antennas from natural elements such as wind, rain, and snow, lacking defensive capabilities. This results in poor battlefield survivability for equipment equipped with such radomes, leading to heavy maintenance and repair tasks. Therefore, developing radomes with bulletproof and blast-resistant capabilities to provide a final line of defense for equipment is of paramount importance.

[0003] Currently, traditional BeiDou radomes are generally made of conventional engineering plastics such as polycarbonate (PC), polyphenylene sulfide (PPS), polyimide (PI), and fiberglass reinforced plastic (FRP). They are manufactured using mature processing methods (machining or mold making) and techniques, resulting in simple, low-cost, and efficient production. These radomes are widely used in vehicle-mounted, shipborne, missile-borne, and airborne equipment where bulletproofing is not required, and can meet various environmental suitability tests such as impact tests, vibration tests, high-temperature tests, salt spray tests, and solar radiation tests. However, although some conventional engineering plastics can have their mechanical strength enhanced by adding glass fibers, this strength is still far from sufficient to withstand the various explosive fragments and shock waves encountered on the battlefield, rendering traditional BeiDou radomes made from them lacking bulletproof capabilities. Furthermore, under long-term exposure to sunlight, high temperature and humidity, and chemical corrosion, the molecular structure of conventional engineering plastics is prone to degradation or cross-linking, leading to aging problems such as cracking, decreased hardness, and loss of toughness, further weakening the structural strength and safety of the radome. Utility Model Content

[0004] This solution aims to overcome at least one defect in the existing technology and provide a high-transmittance bulletproof Beidou radome structure. While maintaining the original electrical performance of the traditional Beidou radome, it improves the overall mechanical strength of the radome, increases bulletproof function, meets the Level II bulletproof requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests", and effectively enhances the equipment's survivability on the battlefield.

[0005] To solve the above-mentioned technical problems, the following technical solution is adopted: Firstly, a high-transmittance, bulletproof BeiDou radome structure is proposed. The radome structure includes an aramid radome and a metal ring; the aramid radome is a radome structure with a wall thickness of 7-9 mm made of aramid III fiber composite material, having a cavity for accommodating the BeiDou antenna and an opening for the BeiDou antenna to enter the cavity; the metal ring is a ring-shaped structure made of hard aluminum alloy, nested in the opening.

[0006] This solution, through the selection of aramid shroud materials and the support of metal rings, along with the choice of materials for the metal rings, enhances the overall mechanical strength and ballistic protection of the radome structure while maintaining the original electrical performance of traditional BeiDou radomes. It meets the Level II ballistic protection requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests," effectively improving the equipment's survivability on the battlefield. Crucially, this solution also controls the wall thickness of the aramid shroud, ensuring that the radome structure meets the requirements of bullets not penetrating the aramid shroud and that the transient bulge during firing is less than 15mm, preventing excessively large transient bulges from damaging the internal antenna elements and causing antenna failure. Simultaneously, it achieves high wave transmittance, thus simultaneously satisfying both ballistic protection and high wave transmittance. This makes it widely applicable to outdoor antenna equipment such as BeiDou short message antennas, BeiDou navigation antennas, and BeiDou high-precision antennas, especially suitable for use in harsh environments and military BeiDou navigation antenna equipment requiring ballistic protection.

[0007] The preferred wall thickness of the aramid liner is 7.5~8.5mm, which helps to improve the balance between ballistic protection and wave transmission. The optimal wall thickness of the aramid liner is 8mm, so as to achieve the best balance between ballistic protection and wave transmission.

[0008] The outer surface of the aramid hood is preferably coated with a weather-resistant fluoropolyurethane enamel. The weather-resistant fluoropolyurethane enamel can effectively shield or absorb harmful ultraviolet radiation, prevent moisture penetration, protect the underlying aramid fibers, and significantly improve the hood structure's ability to resist ultraviolet radiation and climate aging.

[0009] For hard aluminum alloys, 2A12-T4 aluminum alloy is preferred. 2A12-T4 aluminum alloy is an aluminum-copper-magnesium hard aluminum alloy that undergoes solution heat treatment followed by natural aging at room temperature. After natural aging, the strengthening phases within the alloy are fully released, giving it excellent mechanical properties. Its tensile strength typically reaches 420~470 MPa, and its yield strength reaches approximately 275 MPa. Its density is approximately 2.78 g / cm³, exhibiting very high specific strength. This allows the metal ring to provide strong support for the aramid radome while maintaining a lightweight structure. Furthermore, the Brinell hardness (HB) of 2A12-T4 aluminum alloy is generally in the range of 105 to 120, giving the metal ring good wear resistance and resistance to localized indentation.

[0010] The aramid radome and metal ring are bonded together using structural adhesive to improve the stability and reliability of the nested connection between them. This adhesive bonding facilitates a large-area, uniform distribution of the interaction forces between the aramid radome and the metal ring, significantly enhancing overall impact and deformation resistance. This not only directly ensures that ballistic performance meets standards but also avoids the weakening of the material and the impact on optimal wall thickness design caused by mechanical drilling, thus ensuring that high wave transmittance remains unaffected. Furthermore, the continuous adhesive layer provides excellent sealing, effectively resisting corrosion from harsh environments such as moisture and salt spray, comprehensively improving the reliability and durability of the radome in harsh battlefield environments.

[0011] The aramid radome has a first step on the side facing the metal ring, and a second step on the side facing the aramid radome. These steps are nested together, creating a nested connection between the aramid radome and the metal ring. This nested step structure facilitates precise positioning and assembly of the aramid radome and the metal ring, ensuring concentric alignment during assembly, especially during bonding, significantly improving production efficiency and product consistency. More importantly, the nested step structure creates a strong mechanical interlocking effect, working synergistically with the adhesive force of the structural adhesive to resist the enormous shear force and impact torque generated by bullet impact. This effectively prevents the adhesive layer from peeling or misaligning under extreme stress, providing double protection to meet Level II ballistic protection requirements. Furthermore, the nested steps increase the adhesive adhesion area and sealing path, not only enhancing connection strength but also effectively preventing environmental contaminants such as moisture and salt spray from penetrating the interface edges, improving the long-term reliability of the radome in harsh environments.

[0012] Both the first and second steps are ring-shaped structures. The second step is located inside the first step so as to support the opening of the aramid hood from the inside out, resist the shock wave suffered by the aramid hood when it is fired, limit the inward displacement and deformation of the aramid hood, more effectively protect the internal antenna array elements, strengthen the interface's ability to resist shearing and peeling, prevent the structural adhesive layer from failing under impact, and further improve the ballistic performance of the aramid hood antenna hood structure.

[0013] Secondly, a BeiDou antenna device is proposed. This device includes a BeiDou antenna and the aforementioned high-transparency, bulletproof BeiDou radome structure, with the radome structure covering the BeiDou antenna. The BeiDou antenna can be a BeiDou short message antenna, a BeiDou navigation antenna, or a BeiDou high-precision antenna.

[0014] This Beidou antenna equipment utilizes the aforementioned high-transparency bulletproof Beidou antenna radome structure. While maintaining the original electrical performance of traditional Beidou antenna equipment, it enhances the overall mechanical strength and adds bulletproof function, meeting the Level II bulletproof requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests", effectively improving the equipment's survivability on the battlefield.

[0015] Compared with existing technologies, this solution offers the following advantages: By selecting the aramid shroud and using the metal ring for support, as well as choosing the appropriate material for the metal ring, the overall mechanical strength of this radome structure is improved while maintaining the original electrical performance of traditional BeiDou radomes. This enhances its ballistic protection function, meeting the Level II ballistic protection requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests," effectively improving the equipment's survivability on the battlefield. Crucially, this solution also controls the wall thickness of the aramid shroud, ensuring that the radome structure meets the requirements of bullets not penetrating the aramid shroud and that the transient bulge during firing is less than 15mm, preventing excessively large transient bulges from damaging internal antenna elements and causing antenna failure. Furthermore, it possesses high wave transmittance, simultaneously satisfying both ballistic protection and high wave transmittance. This allows for wide application in outdoor antenna equipment such as BeiDou short message antennas, BeiDou navigation antennas, and BeiDou high-precision antennas, and is particularly suitable for use in harsh environments and military BeiDou navigation antenna equipment requiring ballistic protection. Attached Figure Description

[0016] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this solution. To better illustrate the solution, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0017] Figure 1 This is an exploded view of the structure of a high-transparency, bulletproof BeiDou antenna radome.

[0018] Figure 2 This is a cross-sectional view of the assembled state of a high-transparency, bulletproof BeiDou antenna radome structure.

[0019] Figure 3 This is a schematic diagram of the aramid cover.

[0020] Figure 4 This is a schematic diagram of the metal ring structure.

[0021] Figure 5 This is a schematic diagram of the structure of a Beidou antenna device.

[0022] Explanation of reference numerals in the attached diagram: aramid cover 100, first step 110, metal ring 200, second step 210, Beidou antenna 300. Detailed Implementation

[0023] To enable those skilled in the art to better understand this solution, the following detailed description is provided in conjunction with specific embodiments.

[0024] Figures 1-4The diagram illustrates a possible high-transparency, bulletproof BeiDou radome structure, comprising an aramid radome 100 and a metal ring 200. The aramid radome 100 is a radome structure with a cavity and an opening, the cavity communicating with the opening. The cavity accommodates the BeiDou antenna 300, and the opening allows the BeiDou antenna 300 to enter the cavity. The metal ring 200 is an annular structure nested within the opening of the aramid radome 100.

[0025] The aramid cover 100 is made of aramid III fiber composite material. Aramid III is a type of para-aramid, obtained by the copolymerization of three monomers: p-phenylenediamine, terephthaloyl chloride, and a diamine containing a heterocyclic structure. Because it contains heterocyclic structures, it is also called heterocyclic aramid. Aramid III fibers are characterized by high strength, high modulus, and low specific gravity. Its tensile strength is extremely high, reaching 3.0 GPa to 5.5 GPa, far exceeding that of glass fiber and approaching that of carbon fiber, while its density is only 1.44 to 1.45 g / cm³. 3 The high specific strength (strength / density) of aramid III fiber composites results in a strength that is 2-3 times that of glass fiber composites and 5-6 times that of steel at the same areal density. Radomes made from aramid III fibers achieve lightweight design while withstanding extremely high tensile and impact loads. The molecular structure of aramid III fibers possesses rigid chain segments and a degree of flexibility. Upon impact, the fibers can disperse the impact force through deformation, slippage, and energy absorption. Therefore, aramid III fiber composites exhibit excellent impact resistance, making the aramid radome 100 less prone to cracking or breakage when subjected to external impacts or vibrations. Furthermore, the good toughness of the aramid III fiber molecular chains prevents performance degradation due to fatigue under repeated alternating loads. This results in a long fatigue life for the aramid radome 100, making it suitable for applications exposed to dynamic loads for extended periods.

[0026] The metal ring 200 is made of hard aluminum alloy. Hard aluminum alloy has the characteristics of high strength, high hardness, and low density, which can simultaneously meet the requirements of excellent mechanical properties, machinability, and lightweight overall design. Nestled within the opening of the aramid hood 100, it can enhance the mechanical strength of the wide-mouthed aramid hood 100, thereby providing robust support and overall structural reinforcement. The preferred hard aluminum alloy is 2A12-T4 aluminum alloy, which is an aluminum-copper-magnesium hard aluminum alloy that has undergone solution heat treatment followed by natural aging at room temperature. After natural aging, the strengthening phases within the alloy are fully released, giving it excellent mechanical properties. The tensile strength can typically reach 420~470MPa, and the yield strength can reach approximately 275MPa. The density is approximately 2.78g / cm³, exhibiting very high specific strength. This allows the metal ring 200 to provide strong support for the aramid hood 100 while maintaining the lightweight structure of the radome. Moreover, the Brinell hardness (HB) of 2A12-T4 aluminum alloy is generally in the range of 105 to 120, which gives the metal ring 200 good wear resistance and the ability to resist local indentation.

[0027] The use of aramid shroud 100, along with the support of metal ring 200 and the choice of materials for metal ring 200, enhances the overall mechanical strength and ballistic protection of this radome structure while maintaining the original electrical performance of the traditional Beidou antenna 300 radome. It meets the Level II ballistic protection requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests", effectively improving the equipment's survivability on the battlefield.

[0028] The wall thickness h of the aramid radome 100 is 7~9mm, preferably 7.5~8.5mm, and most preferably 8mm. This thickness is beneficial in meeting the requirements that bullets cannot penetrate the aramid radome 100 and that the transient bulge upon being shot is less than 15mm, thus preventing excessively large transient bulges from damaging the internal antenna elements and causing antenna equipment failure. It also improves the transmittance of the aramid radome 100, allowing for the simultaneous achievement of ballistic protection and high transmittance. When the wall thickness of the aramid radome 100 is 8mm, the balance between ballistic protection and transmittance is optimal. Therefore, this radome structure possesses both ballistic protection and high transmittance, and can be widely used in outdoor antenna equipment such as BeiDou short message antennas, BeiDou navigation antennas, and BeiDou high-precision antennas. It is particularly suitable for use in harsh environments and military BeiDou navigation antenna equipment requiring ballistic protection.

[0029] Aramid III fiber itself possesses excellent high and low temperature resistance, with a long-term operating temperature range of -196 to 204°C. Under alternating temperature environments, its molecular structure exhibits strong stability, maintaining good mechanical properties and resisting significant degradation due to thermal oxidation. Furthermore, aramid III fiber demonstrates good resistance to acids, alkalis, and organic solvents, resulting in excellent chemical and damp heat aging resistance. This makes the aramid radome 100 exhibit superior aging resistance and service life. The outer surface of the aramid radome 100 can be coated with a weather-resistant fluoropolyurethane enamel. This enamel effectively shields or absorbs harmful ultraviolet radiation, prevents moisture penetration, protects the underlying aramid fibers, and significantly enhances the radome structure's resistance to ultraviolet radiation and weathering.

[0030] The aramid radome 100 provides excellent ballistic protection and high transmittance, while the metal ring 200 imparts extremely high structural rigidity and support strength to the opening. The two are nested together, achieving a synergistic effect between the aramid radome 100 and the metal ring 200. The aramid radome 100 and the metal ring 200 can also be bonded together using structural adhesive to improve the stability and reliability of the nested connection. Structural adhesive bonding facilitates a large-area, uniform distribution of the interaction forces between the aramid radome 100 and the metal ring 200, greatly enhancing the overall impact and deformation resistance. This not only directly ensures that the ballistic protection performance meets standards but also avoids the weakening of the material and the impact on the optimal wall thickness design caused by mechanical drilling, thus ensuring that the high transmittance remains unaffected. Furthermore, the continuous adhesive layer provides excellent sealing, effectively resisting corrosion from harsh environments such as moisture and salt spray, comprehensively improving the reliability and durability of the radome in harsh battlefield environments.

[0031] The aramid cover 100 has a first step 110 on the side facing the metal ring 200, and a second step 210 on the side facing the aramid cover 100. The first step 110 and the second step 210 are nested together, thus achieving a nested connection between the aramid cover 100 and the metal ring 200. This nested step structure facilitates precise positioning and assembly of the aramid cover 100 and the metal ring 200, ensuring that they remain concentrically aligned throughout the assembly process, especially during bonding, significantly improving production efficiency and product consistency. More importantly, the nested step structure creates a strong mechanical interlocking effect, working synergistically with the adhesive force of the structural adhesive to resist the enormous shear force and impact torque generated by bullet impact. This effectively prevents the adhesive layer from peeling or misaligning under extreme stress, providing double protection to meet the Level II bulletproof requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Bulletproof Vests". In addition, the nested steps increase the adhesion area and sealing path of the adhesive, which not only enhances the connection strength, but also effectively prevents environmental pollutants such as moisture and salt spray from entering from the interface edge, thus improving the long-term reliability of the radome in harsh environments.

[0032] Both the first step 110 and the second step 210 are annular structures. The second step 210 is located inside the first step 110 so as to support the opening of the aramid hood 100 from the inside out, resist the shock wave suffered by the aramid hood 100 when it is fired, limit the inward displacement and deformation of the aramid hood 100, more effectively protect the internal antenna array elements, strengthen the interface's ability to resist shearing and peeling, prevent the structural adhesive layer from failing under impact, and further improve the ballistic performance of the aramid hood 100 antenna hood structure.

[0033] Figure 5 The illustration depicts a possible BeiDou antenna device, comprising a BeiDou antenna 300 and the aforementioned high-transparency, bulletproof BeiDou radome structure, which covers the BeiDou antenna 300. The BeiDou antenna 300 refers to any antenna device with BeiDou functionality, specifically a BeiDou short message antenna, a BeiDou navigation antenna, or a BeiDou high-precision antenna. This BeiDou antenna device utilizes the aforementioned high-transparency, bulletproof BeiDou radome structure, enhancing overall mechanical strength and adding bulletproof capabilities while maintaining the original electrical performance of traditional BeiDou antenna devices. It meets the Level II bulletproof requirements of GJB 4300-2012 "Safety Technical Performance Requirements for Military Body Protection Vests," effectively improving the device's survivability on the battlefield.

[0034] Obviously, the above embodiments of this solution are merely examples for clearly illustrating this solution, and are not intended to limit the implementation of this solution. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this solution should be included within the scope of protection of the claims of this solution.

Claims

1. A high-transmittance, bulletproof BeiDou radome structure, characterized in that, The radome structure includes an aramid radome and a metal ring; the aramid radome is a radome structure with a wall thickness of 7-9 mm made of aramid III fiber composite material, having a cavity for accommodating the BeiDou antenna and an opening for the BeiDou antenna to enter the cavity; the metal ring is a ring-shaped structure made of hard aluminum alloy, nested in the opening.

2. The high-transparency bulletproof Beidou radome structure according to claim 1, characterized in that, The aramid cover has a wall thickness of 7.5~8.5mm.

3. The high-transparency bulletproof Beidou antenna radome structure according to claim 2, characterized in that, The aramid cover has a wall thickness of 8 mm.

4. The high-transmittance bulletproof Beidou radome structure according to any one of claims 1 to 3, characterized in that, The outer surface of the aramid cover is coated with weather-resistant fluoropolyurethane enamel.

5. The high-transmittance bulletproof Beidou radome structure according to any one of claims 1 to 3, characterized in that, The hard aluminum alloy is 2A12-T4 aluminum alloy.

6. The high-transmittance bulletproof Beidou radome structure according to any one of claims 1 to 3, characterized in that, The aramid cover and the metal ring are bonded together as one piece using structural adhesive.

7. The high-transmittance bulletproof Beidou antenna radome structure according to any one of claims 1 to 3, characterized in that, The aramid cover has a first step on the side facing the metal ring at its opening, and a second step on the side facing the aramid cover at the metal ring, with the first step and the second step nested together.

8. The high-transmittance bulletproof Beidou antenna radome structure according to claim 7, characterized in that, Both the first step and the second step are ring-shaped structures, with the second step located inside the first step.

9. A Beidou antenna device, characterized in that, The BeiDou antenna device includes a BeiDou antenna and a high-transparency bulletproof BeiDou antenna radome structure as described in any one of claims 1 to 8, wherein the radome structure covers the BeiDou antenna.

10. The Beidou antenna device according to claim 9, characterized in that, The BeiDou antenna is a BeiDou short message antenna, a BeiDou navigation antenna, or a BeiDou high-precision antenna.

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