Hood body structure of W-band radar radome

Abstract

The utility model discloses a cover body structure of a W-band radar radome, the cover body structure comprises a three-layer composite material structure, the outer layer of the three-layer composite material structure is a wave-transparent coating, the middle layer of the three-layer composite material structure is made of a glass fiber reinforced plastic material, and the inner layer of the three-layer composite material structure is made of a foam material, and the glass fiber reinforced plastic material is formed by processing glass fiber and resin through a vacuum bag pressing or autoclave technology. The radome body structure overcomes the defects of a traditional radome structure, can achieve the characteristics of high wave transmission performance and high structural strength, meets the high-frequency characteristic of the radome, is simple in structure and convenient to manufacture, and reduces the equipment cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to radar antenna cover technical field especially relates to a cover body structure of W wave band radar antenna cover. BACKGROUND

[0002] As an important component of radar system, the antenna cover is mainly used for protecting the radar antenna from the direct invasion of severe natural environment (such as ice and snow, wind and rain, sunlight, etc.), while ensuring the efficient transmission of high-frequency signals in the antenna cover. In order to meet the requirements of radar on detection accuracy and operation stability, the antenna cover not only needs to have high mechanical strength and weather resistance, but also must have excellent electromagnetic transmission performance, i.e. low dielectric constant and low loss characteristics, so as to avoid obvious attenuation or reflection of radar signals.

[0003] The working frequency of W wave band radar antenna cover covers 75-110GHz, and it is mainly applied to high-precision fields such as short-distance tracking, guidance and airport foreign object detection. Since W wave band is in the ultra-high frequency band, the wavelength of electromagnetic wave is short, and the requirements for material dielectric parameters and structural size are extremely strict, so the antenna cover design needs to ensure the structural strength and minimize the reflection, absorption and scattering of electromagnetic wave in the cover body.

[0004] At present, the common antenna cover design schemes mainly include the following:

[0005] Single-layer design: simple structure, but due to the limited thickness of single material, it is often difficult to meet the requirements of high strength and high wave transmission rate at the same time, which easily leads to insufficient rigidity of the antenna cover, and shows high dielectric loss under high frequency conditions.

[0006] A sandwich design and C sandwich design: the mechanical strength is improved by adopting a multi-layer composite structure, but these schemes have great challenges in material selection and thickness matching. The traditional sandwich structure may cause multiple reflections and interferences of electromagnetic wave at the interface of each layer due to the mismatch of dielectric properties of each layer material or the inaccuracy of thickness control, thereby reducing the overall wave transmission performance. In addition, these designs are relatively complex in manufacturing process, difficult to process, and high in cost.

[0007] Further analysis shows that the high-frequency antenna cover has the following special requirements for materials and processes:

[0008] 1. High electromagnetic performance requirement: the dielectric constant, loss tangent and other parameters of each layer material must be strictly controlled to ensure low reflection and low absorption characteristics in the frequency band of 75-110GHz. Traditional materials are often difficult to meet this requirement under high frequency conditions.

[0009] 2. Balance between structural strength and weight: The radome needs to ensure sufficient rigidity and load capacity while achieving lightweight design. Single-layer structure is light, but insufficient in strength; while sandwich structure can improve strength, but increases manufacturing complexity and cost.

[0010] 3. Manufacturing process challenges: The forming process of glass steel material, the adhesion of foam material and the uniformity of the wave-transparent coating all have a significant impact on the performance of the final product. Traditional process has limitations in controlling the thickness and electromagnetic parameters of each layer, resulting in large fluctuations in product performance.

[0011] In summary, the existing technology generally has the problems of difficult to balance the wave-transparent performance and structural strength, complex manufacturing process and inaccurate control of key electromagnetic parameters. Therefore, it is urgent to develop a new type of W-band radar radome cover structure, which is designed by three layers of outer wave-transparent coating, middle glass steel skin and inner foam material, fully utilizing the advantages of each layer of material, achieving high wave-transparent performance, ensuring structural strength and controllability of manufacturing process, to meet the comprehensive requirements of modern high-precision radar system for radome. SUMMARY

[0012] The technical problem to be solved by the utility model is to provide a cover structure of W-band radar radome, which overcomes the defects of traditional radome structure, can realize high wave-transparent performance and high structural strength characteristics, meets the high frequency characteristics of radome, and is simple in structure, convenient to manufacture and low in equipment cost.

[0013] To solve the above technical problems, the utility model discloses a cover structure of W-band radar radome, which comprises three-layer composite material structure of outer wave-transparent coating, middle glass steel material and inner foam material, wherein the glass steel material is processed into shape by vacuum bag pressure or hot press tank process with glass fiber and resin.

[0014] Further, the thickness of the wave-transparent coating is 0.05-0.2mm, and the thickness of the middle layer of the glass steel material is 0.4-0.8mm.

[0015] Further, the glass fiber is one of quartz fiber, high-strength glass fiber, E glass fiber or D glass fiber, and the resin is one of cyanate ester resin, epoxy resin or unsaturated polyester resin.

[0016] Further, the wave-transparent coating is fluorocarbon paint coating or polyurethane coating.

[0017] Further, the foam material is PMI foam or polyurethane foam.

[0018] Further, the glass steel material as the skin layer has a dielectric constant of no more than 4.2 and a loss tangent of no more than 0.02, and the foam material has a dielectric constant of no more than 1.09 and a loss tangent of no more than 0.006.

[0019] Further, thicknesses of the intermediate layer and the inner layer are determined based on a four-terminal network method of a microwave equivalent theory to meet requirements on electrical loss and structural strength in a frequency range of 75-110 GHz of the W wave band.

[0020] Since the cover body structure of the W wave band radar antenna cover adopts the above technical scheme, the cover body structure comprises a three-layer composite material structure of a wave-transparent coating as an outer layer, a glass steel material as an intermediate layer and a foam material as an inner layer, wherein the glass steel material is formed by glass fiber and resin through a vacuum bag pressing or a hot pressing tank process. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be explained further in detail below by combining with the drawings and embodiments:

[0022] Figure 1 It is a cover body structure schematic view of the utility model W wave band radar antenna cover. DETAILED DESCRIPTION

[0023] Embodiments such as Figure 1 As shown in the drawings, the cover body structure of the utility model W wave band radar antenna cover comprises a three-layer composite material structure of a wave-transparent coating 1 as an outer layer, a glass steel material 2 as an intermediate layer and a foam material 3 as an inner layer, wherein the glass steel material 2 is formed by glass fiber and resin through a vacuum bag pressing or a hot pressing tank process.

[0024] Preferably, the thickness of the wave-transparent coating 1 is 0.05-0.2 mm, and the thickness of the intermediate layer of the glass steel material 2 is 0.4-0.8 mm.

[0025] Preferably, the glass fiber is one of quartz fiber, high-strength glass fiber, E glass fiber or D glass fiber, and the resin is one of cyanate ester resin, epoxy resin or unsaturated polyester resin.

[0026] Among them, the dielectric constant of quartz fiber is 3.8, the loss tangent is 0.0001, and the dielectric property is the best, but the price is much higher than that of E glass fiber; compared with E glass fiber, the tensile strength of high-strength glass fiber is increased by 30-40%, and the elastic modulus is increased by 16-20%; E glass fiber is widely used and cheap; the dielectric constant and loss tangent of D glass fiber are only second to quartz fiber, but the tensile strength is higher than that of quartz fiber.

[0027] Unsaturated polyester resin has excellent dielectric properties, process performance and room temperature curable, etc. advantages, so it is used in the antenna cover field first; the advantage of epoxy resin is excellent corrosion resistance and high temperature resistance, high strength, but the dielectric constant and loss angle is higher; cyanate ester resin has very low dielectric constant and loss angle tangent, and high heat resistance, but the material cost is higher, the curing temperature is high, and the process is complex.

[0028] Preferably, the wave-transparent coating 1 is fluorocarbon paint coating or polyurethane coating.

[0029] Among them, fluorocarbon paint has excellent corrosion resistance, strong resistance to chemicals, solvents, acids, bases and other chemicals, suitable for marine and other corrosive environments, and has good self-cleaning property, smooth surface and not easy to stain; polyurethane paint has high hardness, good wear resistance, flexible paint film, can withstand certain deformation without cracking, suitable for large temperature difference or vibration environment.

[0030] Preferably, the foam material 3 is PMI foam or polyurethane foam.

[0031] PMI (polymethyl methacrylimide) foam is a high-performance foam material, which has higher strength per unit weight than polyurethane foam, higher temperature resistance, and is easy to process, but the price is higher than that of polyurethane foam.

[0032] The selection of each type of material should be considered comprehensively according to electrical properties and structural indicators, use environment, cost and other factors.

[0033] Preferably, the glass steel material as the skin layer has a dielectric constant not greater than 4.2 and a loss angle tangent not greater than 0.02, and the foam material has a dielectric constant not greater than 1.09 and a loss angle tangent not greater than 0.006.

[0034] Preferably, the thickness of the intermediate layer and the inner layer is determined based on the four-terminal network method of microwave equivalent theory to meet the requirements of electrical loss and structural strength in the frequency range of 75-110 GHz in W band.

[0035] The cover structure includes, from outside to inside, a wave-transparent coating on the outer surface, an intermediate layer as a skin, and a foam layer. The wave-transparent coating is coated with fluoroplastic or polyurethane, so that the entire antenna cover meets the high frequency characteristics. The skin is made of glass fiber and resin and is processed into a support structure of the entire antenna cover, with a dielectric constant ≤4.2 and a loss angle tangent ≤0.02, thereby improving the structural strength of the antenna cover. The foam layer has a dielectric constant ≤1.09 and a loss angle tangent ≤0.006. In a given frequency range in W band, the four-terminal network method based on the microwave equivalent theory can be used to determine the optimal thickness of the intermediate layer and the foam layer. It not only meets the high frequency characteristics, but also significantly improves the structural strength.

[0036] In actual manufacture of the cover body structure, first, the types and dielectric constants and loss tangent of the wave-transparent coating, the intermediate layer and the foam layer are selected; when the foam layer is not contained and only the wave-transparent coating is contained, the optimal wave-transparent coating and the optimal thickness of the intermediate layer are determined according to the four-terminal network method according to the working frequency range of the W wave band; the thickness of the foam layer is selected according to the determined thickness of the wave-transparent coating and the intermediate layer, so as to meet the requirements of the electrical loss and the structural strength index; the intermediate layer is formed by using the vacuum bag pressing or the hot pressing tank process and the foam layer is cemented according to the determined type and thickness of the intermediate layer, and finally the wave-transparent coating is sprayed to manufacture the W wave band radar antenna cover.

[0037] Compared with the W wave band radar antenna cover with the traditional single-layer design, the A sandwich design and the C sandwich design, the cover body structure can simultaneously realize high wave-transparency and high structural strength of the radar antenna cover and meet the use requirements of the W wave band radar antenna cover.

Claims

1. A radome structure of a W-band radar antenna, characterized by: The three-layer composite material structure comprises a wave-transparent coating as an outer layer, a glass-steel material as an intermediate layer and a foam material as an inner layer, wherein the glass-steel material is formed by using glass fiber and resin through vacuum bag pressing or hot pressing tank process.

2. The radome structure of claim 1, wherein: The thickness of the wave-transparent coating is 0.05-0.2 mm, and the thickness of the intermediate layer of the glass-steel material is 0.4-0.8 mm.

3. The radome structure of claim 1 or 2, wherein: The glass fiber is one of quartz fiber, high-strength glass fiber, E glass fiber or D glass fiber, and the resin is one of cyanate ester resin, epoxy resin or unsaturated polyester resin.

4. The radome structure of claim 1, wherein: The wave-transparent coating is fluorocarbon paint coating or polyurethane coating.

5. The radome structure of claim 1, wherein: The foam material is PMI foam or polyurethane foam.

6. The radome structure of claim 1, wherein The dielectric constant of the glass-steel material as a skin layer is not greater than 4.2, and the loss tangent is not greater than 0.02; the dielectric constant of the foam material is not greater than 1.09, and the loss tangent is not greater than 0.

006.

7. The radome structure of claim 1, wherein The thicknesses of the intermediate layer and the inner layer are determined based on the four-terminal network method of microwave equivalent theory to meet the requirements of electrical loss and structural strength in the frequency range of 75-110 GHz of W wave band.

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