Antenna interlayer material, antenna interlayer structure, antenna housing and forming method thereof

Abstract

The invention belongs to the technical field of high-frequency satellite communication, and relates to an antenna interlayer material, an antenna interlayer structure, an antenna housing and a forming method thereof, the antenna interlayer material comprises, by mass, 70-85 parts of polypropylene and 15-30 parts of glass fibers, and the content of the glass fibers affects the dielectric constant of the antenna interlayer material; the antenna interlayer material is applied to forming of an antenna interlayer structure. According to the invention, the antenna interlayer material is composed of 70-85 parts by mass of polypropylene and 15-30 parts by mass of glass fiber, the polypropylene is used as a substrate material, and the addition of the glass fiber limits the orientation movement of a polypropylene polar group and increases the resistance of the polypropylene polar group or chain segment along with the polarization orientation of an electric field, thereby reducing the dielectric constant of the polypropylene and improving the dielectric constant of the antenna. The antenna sandwich structure prepared from the antenna sandwich material is low in dielectric constant, ensures accurate and stable signal transmission in a broadband, improves the stability and reliability of a communication system, and is suitable for antenna housing preparation in the field of high-frequency satellite communication.

Description

Technical Field

[0001] The present invention relates to the technical field of high-frequency satellite communications, and in particular to an antenna sandwich material, an antenna sandwich structure, a radome and a molding method thereof. Background Art

[0002] The radome, as a key component in the communication system, is a special structure that protects the antenna from harsh environments (such as wind, rain, dust, ultraviolet rays, etc.), while ensuring that the antenna can efficiently and stably transmit and receive electromagnetic wave signals. The radome must not only have sufficient mechanical strength and weather resistance to ensure the stable operation of the antenna in a complex environment, but also have excellent electromagnetic transmittance to minimize the impact on electromagnetic wave transmission. In the field of satellite communications, the performance requirements for radomes are increasing, especially their high-frequency wave transmittance performance has become a research hotspot.

[0003] In this context, the antenna sandwich structure has been widely explored as an innovative design, aiming to balance the mechanical strength and electromagnetic permeability of the antenna cover through reasonable material selection and structural design. There is a certain amount of research on the antenna sandwich structure in the prior art. See the patent document with application number 201810159161.3, which discloses a method for preparing a high-frequency wave-transparent sandwich structure composite material 5G antenna cover. The antenna cover consists of inner and outer skins and a core layer material. The skin material is a glass fiber reinforced cyanate ester modified epoxy resin composite material, and the core layer material is an aramid honeycomb core.

[0004] It can be seen that the core material of the antenna cover is aramid honeycomb core, which has excellent mechanical properties and heat resistance, allowing the antenna cover to maintain structural stability in complex environments. However, in the field of high-frequency satellite communications, signals are usually required to have high stability and reliability, and aramid has a high dielectric constant. The electromagnetic wave penetration loss of the antenna cover made of aramid is large, and the signal is easily severely attenuated and interfered during transmission, thus affecting the stability and reliability of the communication system. Summary of the invention

[0005] In order to solve the technical problem in the background technology that in the field of high-frequency satellite communications, the electromagnetic wave penetration loss of the antenna cover made of aramid is large, and the signal is easily severely attenuated and interfered during the transmission process, thereby affecting the stability and reliability of the communication system, the present invention provides an antenna sandwich material, an antenna sandwich structure, a antenna cover and a molding method thereof.

[0006] The antenna sandwich material of the present invention is composed of 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber. The polypropylene is used as a base material. The addition of the glass fiber limits the orientation movement of the polar groups of the polypropylene, increases the resistance of the polar groups or segments of the polypropylene to follow the polarization orientation of the electric field, and thus reduces the dielectric constant of the polypropylene. The antenna sandwich structure prepared by the antenna sandwich material has a low dielectric constant, ensures accurate and stable signal transmission in a wide frequency band, improves the stability and reliability of the communication system, and is suitable for the preparation of antenna covers in the field of high-frequency satellite communications.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] An antenna sandwich material comprises: 70 to 85 parts by weight of polypropylene and 15 to 30 parts by weight of glass fiber, wherein the content of the glass fiber affects the dielectric constant of the antenna sandwich material; the antenna sandwich material is used for the molding of an antenna sandwich structure, and the dielectric constant of the antenna sandwich material affects the wave transmission performance of the antenna sandwich structure.

[0009] In a specific embodiment, the bulk density of the antenna interlayer material is in the range of 30 kg / m 3 ~60kg / m 3 .

[0010] In a specific embodiment, the length of the glass fiber ranges from 100 μm to 500 μm.

[0011] An antenna sandwich structure is prepared by using the above-mentioned antenna sandwich material; the antenna sandwich structure is a honeycomb structure.

[0012] In a specific possible implementation manner, the wall thickness of a single honeycomb hole in the honeycomb structure ranges from 0.1 mm to 0.2 mm.

[0013] In a specific possible implementation manner, the diameter of a single honeycomb hole in the honeycomb structure ranges from 5 mm to 10 mm, and the thickness of a single honeycomb hole ranges from 5.2 mm to 10.4 mm.

[0014] A radome, comprising an outer skin layer and an inner skin layer, and also comprising the above-mentioned antenna sandwich structure; the antenna sandwich structure is sandwiched between the inner skin layer and the outer skin layer, and the surface density range of the outer skin layer and the inner skin layer is 290g / m 2 ~310g / m 2 The thickness of the outer skin layer and the inner skin layer are both in the range of 0.3 mm to 0.4 mm. By setting up the antenna sandwich structure, the electromagnetic wave penetration loss of the antenna cover is reduced and the wave transmission performance of the antenna cover is improved.

[0015] In a specific possible implementation manner, the radome further comprises a gel coat layer; the gel coat layer is attached to a side of the outer skin layer away from the inner skin layer, and the mixed viscosity of the gel coat layer is in the range of 250 mPa.s to 450 mPa.s.

[0016] A method for forming a radome comprises the following steps:

[0017] S1. Mold preparation: polishing the mold surface and coating the mold release agent, then spraying the epoxy gel coat resin layer to form a gel coat layer, wherein the thickness of the gel coat layer is within the range of 0.35±0.15 mm;

[0018] S2. Laying and pre-pressing the outer skin layer: When the curing degree of the gel coat layer reaches 60% or above, lay multiple layers of ultra-high molecular weight polyethylene prepreg on the surface of the gel coat layer in sequence as the outer skin layer. The thickness of the outer skin layer is in the range of 0.3mm to 0.4mm. The outer skin layer is sealed in a vacuum bag and vacuum pre-pressed under the conditions of a vacuum degree of not less than 0.09MPa and a pre-pressing time of 20min to 30min.

[0019] S3. Laying and re-prepressing the antenna sandwich structure and the inner skin layer: Laying the antenna sandwich structure formed by 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber on the surface of the outer skin layer, and then laying multiple layers of ultra-high molecular weight polyethylene prepreg as the inner skin layer on the surface of the antenna sandwich structure in sequence, with the thickness of the inner skin layer being in the range of 0.3mm to 0.4mm, and performing vacuum prepressing under the conditions of a vacuum degree of not less than 0.09MPa and a prepressing time of 20min to 30min to form the antenna cover to be processed;

[0020] S4, curing the radome to be processed to form the radome.

[0021] In a specific embodiment, the curing conditions in step S4 are:

[0022] Under the conditions of a vacuum degree of not less than 0.09MPa and a pre-compression pressure of 0.4MPa, the temperature of the antenna cover to be treated is raised to 140°C at a heating rate of 1 to 2°C / min, kept warm for 60 minutes, and then reduced to below 60°C at a cooling rate of 1 to 2°C / min to complete the fixation and shaping to form the antenna cover.

[0023] In summary, the present invention has the following beneficial technical effects:

[0024] 1. The antenna interlayer material of the present invention is composed of 70 to 85 parts by mass of polypropylene and 15 to 30 parts by mass of glass fiber. Polypropylene is used as the base material. The addition of glass fiber limits the orientation movement of the polar groups of polypropylene, increases the resistance of the polar groups or segments of polypropylene to follow the polarization orientation of the electric field, thereby reducing the dielectric constant of polypropylene. The antenna interlayer structure prepared by the antenna interlayer material has a low dielectric constant, ensures accurate and stable signal transmission within a wide frequency band, improves the stability and reliability of the communication system, and is suitable for the preparation of antenna covers in the field of high-frequency satellite communications.

[0025] 2. The antenna sandwich structure of the present invention is a honeycomb structure. The regular arrangement of the honeycomb structure and the multiple air-filled chambers can reduce the scattering and reflection of electromagnetic waves during the penetration process, further reduce the penetration loss of electromagnetic waves, and improve the wave transmission performance of the antenna cover. In addition, the regularity of the honeycomb structure also helps to achieve a more uniform distribution of electromagnetic waves, thereby improving the overall performance of the antenna.

[0026] 3. The antenna cover of the present invention is composed of an outer skin layer, an inner skin layer and an antenna sandwich structure with high wave-transmitting performance. During signal transmission, electromagnetic waves efficiently penetrate the antenna cover, reducing the attenuation of electromagnetic waves during transmission. Signal transmission is accurate and stable within a wide frequency band, and is suitable for the field of high-frequency satellite communications.

[0027] 4. The forming method of the radome of the present invention achieves a close combination of the multi-layer structure by sequentially laying a gel coat layer, an outer skin layer, an antenna sandwich structure and an inner skin layer on the mold surface, thereby ensuring good interface bonding between the various layers of the structure. At the same time, by precisely controlling the laying thickness, pre-pressing conditions and curing parameters of each layer of the structure, defects such as deformation and stratification during the forming process of the radome are avoided, thereby ensuring the dimensional stability and structural integrity of the radome. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further explained below in conjunction with embodiments, but the present invention is not limited to the implementation modes described below.

[0029] The present invention aims to provide an antenna interlayer material, which is composed of 70 to 85 parts by mass of polypropylene and 15 to 30 parts by mass of glass fiber. Polypropylene is used as a base material. The addition of glass fiber limits the orientation movement of polar groups of polypropylene, increases the resistance of polar groups or segments of polypropylene to follow the polarization orientation of an electric field, thereby reducing the dielectric constant of polypropylene. The antenna interlayer structure prepared by the antenna interlayer material has a low dielectric constant, ensures accurate and stable signal transmission within a wide frequency band, improves the stability and reliability of a communication system, and is suitable for the preparation of antenna covers in the field of high-frequency satellite communications.

[0030] Embodiment 1:

[0031] An antenna sandwich material comprises: 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber, wherein the content of the glass fiber affects the dielectric constant of the antenna sandwich material; the antenna sandwich material is used for the molding of an antenna sandwich structure, and the dielectric constant of the antenna sandwich material affects the wave transmission performance of the antenna sandwich structure.

[0032] Specifically, polypropylene is the base material for forming the antenna sandwich structure. By adding glass fiber to polypropylene, the dielectric constant of polypropylene is reduced, thereby reducing the dielectric constant of the antenna sandwich structure prepared by the antenna sandwich material, and ultimately improving the wave transmission performance of the antenna sandwich structure. In this embodiment, the insertion loss of the antenna sandwich material in the X-band (2GHz~40GHz) is ≤-0.3dB, and the wave transmittance is greater than 93%, and the signal transmission is accurate and stable within a wide band.

[0033] More specifically, the mass parts of polypropylene can be 70, 80, or 85, and the mass parts of glass fiber can be 15, 20, or 30. The mass parts of polypropylene and glass fiber can be selected based on the required dielectric constant of the antenna interlayer material. In this embodiment, the antenna interlayer structure is formed based on 70 mass parts of polypropylene and 15 mass parts of glass fiber.

[0034] An antenna sandwich structure is prepared using the above antenna sandwich material; the antenna sandwich structure is a honeycomb structure; the regular arrangement of the honeycomb structure and the multiple air-filled cells can reduce the scattering and reflection of electromagnetic waves during the penetration process, further reduce the penetration loss of electromagnetic waves, and improve the wave transmission performance of the antenna cover. In addition, the regularity of the honeycomb structure also helps to achieve a more uniform distribution of electromagnetic waves, thereby improving the overall performance of the antenna.

[0035] A radome comprises an outer skin layer, an inner skin layer and the above-mentioned antenna sandwich structure. The antenna sandwich structure is sandwiched between the inner skin layer and the outer skin layer, and the honeycomb holes of the honeycomb structure are arranged toward the outer skin layer and the inner skin layer; the surface density range of the outer skin layer and the inner skin layer is 290g / m 2 ~310g / m 2 The thickness of the outer skin and the inner skin is in the range of 0.3mm to 0.4mm. By setting the antenna sandwich structure, the electromagnetic wave penetration loss of the radome is reduced and the wave transmission performance of the radome is improved.

[0036] Further, the outer skin layer and the inner skin layer are both ultra-high molecular polyethylene prepregs, and the content of the resin in the ultra-high molecular polyethylene prepreg is in the range of 40±2%, and the resin system is an epoxy resin curing system or a cyanate resin curing system. Specifically, the content of the resin in the ultra-high molecular polyethylene prepreg can be 38%, 40%, or 42%. According to the strength requirements of the outer skin layer and the inner skin layer, the corresponding content of the resin in the ultra-high molecular polyethylene prepreg can be selected; in this embodiment, the content of the resin in the ultra-high molecular polyethylene prepreg is 40%.

[0037] More specifically, the outer skin layer and the inner skin layer can both be ultra-high molecular weight polyethylene twill prepreg or ultra-high molecular weight polyethylene plain prepreg. Suitable prepreg structures are selected to improve the structural strength of the outer skin layer and the inner skin layer. Such arrangements are all acceptable. Preferably, the outer skin layer and the inner skin layer are both ultra-high molecular weight polyethylene twill prepreg. The twill structure can reduce the reflection and scattering of electromagnetic waves inside the antenna sandwich structure and has good electromagnetic wave penetration performance, thereby reducing signal attenuation and interference and improving the antenna's receiving and transmitting efficiency.

[0038] Specifically, the surface density range of the outer skin layer and the inner skin layer can be 290g / m 2 , can be 300g / m 2 , can also be 310g / m 2 According to the required strength and hardness of the outer skin layer and the inner skin layer, the surface density of the outer skin layer and the inner skin layer is selected so that the strength and hardness of the outer skin layer and the inner skin layer meet the requirements; in this embodiment, the surface density of the outer skin layer and the inner skin layer is 300g / m 2 .

[0039] Specifically, the thickness of the ultra-high molecular weight polyethylene prepreg can be 0.13 mm, 0.15 mm, or 0.17 mm. The thickness of the ultra-high molecular weight polyethylene prepreg is selected according to the required thickness of the outer skin layer and the inner skin layer, and it is ensured that the thickness of the outer skin layer and the inner skin layer meets the requirements; in this embodiment, the thickness of the ultra-high molecular weight polyethylene prepreg is 0.15 mm.

[0040] Specifically, the thickness of the outer skin layer and the inner skin layer can be 0.3mm, 0.35mm, or 0.4mm. By setting the outer skin layer and the inner skin layer of appropriate thickness, stable signal transmission can be achieved. Such settings are all acceptable. In this embodiment, the thickness of the outer skin layer and the inner skin layer are both 0.3mm.

[0041] A method for forming a radome comprises the following steps:

[0042] S1. Mold preparation: polishing the mold surface and coating the mold release agent, then spraying the epoxy gel coat resin layer to form a gel coat layer, wherein the thickness of the gel coat layer is within the range of 0.35±0.15 mm;

[0043] S2. Laying and pre-pressing the outer skin layer: When the curing degree of the gel coat layer reaches 60% or above, lay multiple layers of ultra-high molecular weight polyethylene prepreg on the surface of the gel coat layer in sequence as the outer skin layer. The thickness of the outer skin layer is in the range of 0.3mm to 0.4mm. The outer skin layer is sealed in a vacuum bag and vacuum pre-pressed under the conditions of a vacuum degree of not less than 0.09MPa and a pre-pressing time of 20min to 30min.

[0044] S3. Laying and re-prepressing the antenna sandwich structure and the inner skin layer: Laying the antenna sandwich structure formed by 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber on the surface of the outer skin layer, and then laying multiple layers of ultra-high molecular weight polyethylene prepreg as the inner skin layer on the surface of the antenna sandwich structure in sequence, with the thickness of the inner skin layer being in the range of 0.3mm to 0.4mm, and performing vacuum prepressing under the conditions of a vacuum degree of not less than 0.09MPa and a prepressing time of 20min to 30min to form the antenna cover to be processed;

[0045] S4, curing the radome to be processed to form the radome.

[0046] In this embodiment, the gel coat layer is epoxy gel coat resin, and the mixed viscosity of the epoxy gel coat resin ranges from 250mPa.s to 450mPa.s, the hardness is 90D, and the density is 1.3g / cm 3 In this embodiment, two, three, four or five layers of ultra-high molecular weight polyethylene prepreg can be laid in sequence on the surface of the gel coat layer as the outer skin layer. The specific number of layers of ultra-high molecular weight polyethylene prepreg laid can be adjusted according to actual conditions to ensure that the radome achieves the required mechanical and electromagnetic properties. Such settings are all acceptable.

[0047] Specifically, two, three, four or five layers of ultra-high molecular weight polyethylene prepreg can be laid in sequence on the surface of the antenna sandwich structure as the inner skin layer. The specific number of layers of ultra-high molecular weight polyethylene prepreg laid can be adjusted according to actual conditions to ensure that the antenna cover achieves the required mechanical and electromagnetic properties. This type of setting is acceptable.

[0048] Embodiment 2:

[0049] The antenna interlayer material of this embodiment is based on the embodiment 1. The bulk density of the antenna interlayer material is in the range of 30 kg / m 3 ~60kg / m 3 While facilitating the overall weight reduction of the radome, it ensures the overall mechanical strength of the radome and facilitates the preparation of large radomes.

[0050] Specifically, the bulk density of the antenna interlayer material can be 30 kg / m 3 , can be 45kg / m 3 , can also be 60kg / m 3 According to the required strength of the antenna sandwich structure, the volume density of the antenna sandwich material can be selected appropriately; in this embodiment, the volume density of the antenna sandwich material is 45kg / m 3 .

[0051] Embodiment 3:

[0052] In the antenna sandwich material of this embodiment, based on the embodiment 1, the length of the glass fiber ranges from 100 μm to 500 μm; on the basis of ensuring the structural strength of the glass fiber itself, the overall impedance matching of the antenna sandwich material is improved.

[0053] Specifically, the length of the glass fiber can be 100 μm, 300 μm, or 500 μm. The appropriate length of the glass fiber can be selected according to the electromagnetic wave penetration loss of the required antenna interlayer material. In this embodiment, the length of the glass fiber is 100 μm.

[0054] In this embodiment, the antenna interlayer material is formed of polypropylene and glass fiber. The addition of glass fiber limits the orientation movement of the polar groups of polypropylene, increases the resistance of the polar groups or segments of polypropylene to follow the polarization orientation of the electric field, and thus reduces the dielectric constant of polypropylene. The antenna interlayer structure formed by the antenna interlayer material has a low dielectric constant, and the signal transmission is accurate and stable within a wide frequency band, and can be applied to the field of high-frequency satellite communications.

[0055] Embodiment 4:

[0056] The antenna sandwich structure of this embodiment is based on the third embodiment, in which the diameter of a single honeycomb hole in the honeycomb structure ranges from 5 mm to 10 mm, and the thickness of a single honeycomb hole ranges from 5.2 mm to 10.4 mm.

[0057] Specifically, the diameter of a single honeycomb hole in the honeycomb structure can be 5 mm, 8 mm, or 10 mm. The diameter of a suitable single honeycomb hole is selected according to the optimal thickness of electromagnetic wave penetration of the antenna sandwich structure to improve the wave transmission performance of the antenna sandwich structure. In this embodiment, the diameter of a single honeycomb hole in the honeycomb structure is 8 mm.

[0058] Specifically, the thickness of a single honeycomb hole in the honeycomb structure can be 5.2 mm, 7.8 mm, or 10.4 mm. According to the optimal thickness of electromagnetic wave penetration of the antenna sandwich structure, the thickness of a suitable single honeycomb hole can be selected to improve the wave transmission performance of the antenna sandwich structure. In this embodiment, the thickness of a single honeycomb hole is 7.8 mm.

[0059] Embodiment 5:

[0060] The radome of this embodiment, based on the embodiment 1, also includes a gel coat layer, which is adhered to the side of the outer skin layer away from the inner skin layer, and the mixing viscosity of the gel coat layer ranges from 250mPa.s to 450mPa.s, thereby improving the uniformity of the gel coat layer.

[0061] Specifically, the mixed viscosity of the gel coat layer can be 250 mPa.s, 350 mPa.s, or 450 mPa.s. An appropriate mixed viscosity of the gel coat layer can be selected to ensure stable transmission of electromagnetic waves. In this embodiment, the mixed viscosity of the gel coat layer is 350 mPa.s.

[0062] In this embodiment, the gel coat layer is provided to enhance the weather resistance and service life of the antenna cover, while ensuring good wave transmittance so that the antenna can normally receive and transmit signals.

[0063] Embodiment 6:

[0064] The forming method of the antenna cover of this embodiment is based on the embodiment 1, and the conditions for the curing treatment in step S4 are: under the conditions of a vacuum degree of not less than 0.09MPa and a pre-compression pressure of 0.4MPa, the temperature of the antenna cover to be treated is increased to 140°C at a heating rate of 1 to 2°C / min, and kept warm for 60 minutes; the temperature of the antenna cover to be treated is reduced to below 60°C at a cooling rate of 1 to 2°C / min to complete the fixing and shaping to form the antenna cover.

[0065] Specifically, in this embodiment, the conditions for the curing treatment are: raising the temperature of the antenna cover to be treated to 140°C at a heating rate of 2°C / min, and keeping it warm for 60 minutes; lowering the temperature of the antenna cover to be treated to below 60°C at a cooling rate of 2°C / min to complete the fixing and shaping to form the antenna cover.

[0066] The preferred embodiments of the present invention are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An antenna interlayer material, characterized in that: include: 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber, wherein the content of the glass fiber affects the dielectric constant of the antenna interlayer material; The antenna sandwich material is used for forming an antenna sandwich structure, and the dielectric constant of the antenna sandwich material affects the wave transmission performance of the antenna sandwich structure.

2. The antenna interlayer material according to claim 1, characterized in that: The bulk density of the antenna interlayer material is in the range of 30 kg / m 3 ~60kg / m 3 .

3. The antenna interlayer material according to claim 1, characterized in that: The length of the glass fiber ranges from 100 μm to 500 μm.

4. An antenna sandwich structure, characterized in that: The antenna is prepared by using the antenna interlayer material according to any one of claims 1 to 3; The antenna sandwich structure is a honeycomb structure.

5. The antenna sandwich structure according to claim 4, characterized in that: The wall thickness of a single honeycomb hole in the honeycomb structure ranges from 0.1 mm to 0.2 mm.

6. The antenna sandwich structure according to claim 5, characterized in that: The diameter of a single honeycomb hole in the honeycomb structure ranges from 5 mm to 10 mm, and the thickness of a single honeycomb hole ranges from 5.2 mm to 10.4 mm.

7. A radome, comprising an outer skin layer and an inner skin layer, characterized in that: Also includes the antenna sandwich structure according to any one of claims 4 to 6; The antenna sandwich structure is sandwiched between the inner skin layer and the outer skin layer, and the surface density range of the outer skin layer and the inner skin layer is 290g / m 2 ~310g / m 2 The thickness of the outer skin layer and the inner skin layer are both in the range of 0.3 mm to 0.4 mm; By setting up an antenna sandwich structure, the electromagnetic wave penetration loss of the antenna cover is reduced and the wave transmission performance of the antenna cover is improved.

8. The radome according to claim 7, characterized in that: The radome also includes a gel coat layer; The gel coat layer is attached to the side of the outer skin layer away from the inner skin layer, and the mixed viscosity of the gel coat layer is in the range of 250 mPa.s to 450 mPa.s.

9. A method for forming a radome, characterized in that: The following steps are involved: S1. Mold preparation: polishing the mold surface and coating the mold release agent, then spraying the epoxy gel coat resin layer to form a gel coat layer, wherein the thickness of the gel coat layer is within the range of 0.35±0.15 mm; S2. Laying and pre-pressing the outer skin layer: When the curing degree of the gel coat layer reaches 60% or above, lay multiple layers of ultra-high molecular weight polyethylene prepreg on the surface of the gel coat layer in sequence as the outer skin layer. The thickness of the outer skin layer is in the range of 0.3mm to 0.4mm. The outer skin layer is sealed in a vacuum bag and vacuum pre-pressed under the conditions of a vacuum degree of not less than 0.09MPa and a pre-pressing time of 20min to 30min. S3. Laying and re-prepressing the antenna sandwich structure and the inner skin layer: Laying the antenna sandwich structure formed by 70-85 parts by weight of polypropylene and 15-30 parts by weight of glass fiber on the surface of the outer skin layer, and then laying multiple layers of ultra-high molecular weight polyethylene prepreg as the inner skin layer on the surface of the antenna sandwich structure in sequence, the thickness of the inner skin layer is in the range of 0.3mm to 0.4mm, and vacuum prepressing is performed under the conditions of a vacuum degree of not less than 0.09MPa and a prepressing time of 20min to 30min to form a radome to be processed; S4, curing the radome to be processed to form the radome.

10. The method for forming a radome according to claim 9, characterized in that: The conditions for the curing treatment in step S4 are: Under the conditions of a vacuum degree of not less than 0.09MPa and a pre-compression pressure of 0.4MPa, the temperature of the antenna cover to be treated is raised to 140°C at a heating rate of 1 to 2°C / min, kept warm for 60 minutes, and then reduced to below 60°C at a cooling rate of 1 to 2°C / min to complete the fixation and shaping to form the antenna cover.