EP4675851A1

EP4675851A1 - Radome and preparation method therefor

Info

Publication number: EP4675851A1
Application number: EP24777735.2A
Authority: EP
Inventors: Jibin ZHOU; Baoliang XU; Jinchuan ZHANG; Dongchen BIAN; Xiaojing SHEN; Shaoqiang DANG; Rongzheng TANG
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2023-03-31
Filing date: 2024-03-13
Publication date: 2026-01-07
Also published as: JP2026508679A; WO2024198945A1; CN118783102A

Abstract

Provide are a radome, which comprises a radome body and a composite panel. The radome body is provided with a hollow region, which has a first opening and a second opening in a first direction. The first direction is a thickness direction of the radome body. The composite panel comprises a core layer, a first skin layer and a second skin layer. The core layer is embedded in the hollow region and has a first side and a second side opposite to each other in the first direction. The first skin layer is sealingly attached to the first side and covers the first opening. The second skin layer is sealingly attached to the second side and covers the second opening. The core layer is made of a low dielectric constant material, and the peripheral edge of the core layer extends to abut against the inner wall of the hollow region.

Description

Cross-Reference to Related Application

The present disclosure claims the priority of Chinese Patent Application 2023103793926, filed on 31 March 2023 and entitled "Radome and Preparation method therefor", the disclosure of which is incorporated herein by reference in its entirety.

Technical Field

The present disclosure relates to the technical field of communications, and in particular, to a radome and a preparation method therefor.

Background

The radome is a structure that protects the antenna system from external environmental influences. It is required to have good electromagnetic wave penetration property in electrical performance, and the mechanical performance can withstand the influences of external harsh environment.
Traditional radomes for communication equipment are made from thermoplastic materials like PC through injection moulding. The properties of these materials result in a high dielectric constant, which significantly obstructs electromagnetic waves emitted by the antenna, leading to low transmission rates and affecting antenna performance.

Summary

The main objective of the present disclosure is to provide a radome and a preparation method therefor, which can effectively reduce the dielectric constant of the radome. Using the radome body, the first skin layer, and the second skin layer to protect the core layer eliminates the need for edge sealing. The entire radome can serve as a radiation region, which not only improves the antenna performance but also reduces costs by eliminating the need for edge sealing, thereby minimizing the size of the radome.
In a first aspect of the present disclosure, provided is a radome, comprising a radome body and a composite panel, wherein the radome body is provided with a hollow region, the hollow region has a first opening and a second opening in a first direction, and the first direction is a thickness direction of the radome body.
The composite panel comprises: a core layer embedded in the hollow region, the core layer having a first side and a second side opposite to each other in the first direction; a first skin layer, sealingly attached to the first side of the core layer and covering the first opening; a second skin layer, sealingly attached to the second side of the core layer and covering the second opening; wherein the core layer is made of a low dielectric constant material, and the peripheral edge of the core layer extends to abut against the inner wall of the hollow region.
In a second aspect of the present disclosure, provided is a preparation method for a radome. The method comprises: providing a hollow region on a radome body; cropping a prepreg and a light-weight low-dielectric composite material into preset shapes, wherein the prepreg is cropped to form a first skin layer and a second skin layer, and the light-weight low-dielectric composite material is cropped to form a core layer; sequentially laying the first skin layer, the radome body, the core layer and the second skin layer in a mould, and embedding the core layer in a hollow region of the radome body, wherein the first skin layer and the second skin layer are respectively adhered to two opposite sides of the core layer in a thickness direction, and the first skin layer and the second skin layer are tightly adhered to the mould; placing the mould in a moulding machine for hot pressing, so as to form the first skin layer, the radome body, the core layer and the second skin layer by hot pressing; after hot pressing is completed, cooling the mould, then opening the mould, and taking out the manufactured radome.

Brief Description of the Drawings

To describe the technical solutions in the embodiments of the present disclosure more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a radome from a first perspective according to an embodiment of the present disclosure;
Fig. 2 is a schematic structural diagram of a radome from a second perspective according to an embodiment of the present disclosure;
Fig. 3 is an exploded schematic diagram of a radome according to an embodiment of the present disclosure;
Fig. 4 is a schematic sectional diagram of a radome body in a width direction according to an embodiment of the present disclosure;
Fig. 5 is a flowchart of a method for manufacturing a radome according to an embodiment of the present disclosure;
Fig. 6 is an antenna direction diagram of Embodiment 1, Comparison Example 1 and Comparison Example 2.

Reference signs are as follows:
100, radome; 10, radome body; 10a, plate body; 10b, surrounding edge; 11, hollow region; 12, first surface; 121, first limiting groove; 13, second surface; 131, second limiting groove; 20, composite panel; 21, core layer; 211, first side; 212, second side; 22, first skin layer; 23, second skin layer.

Detailed Description of the Embodiments

Hereinafter, the technical solutions in the embodiments of the present disclosure will be described clearly and thoroughly with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the embodiments as described are some of the embodiments of the present disclosure, and are not all of the embodiments. On the basis of the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without inventive effort shall all belong to the scope of protection of the present disclosure.
It should be understood that, terms used in the description of the present disclosure are used for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. Terms "a", "an", and "the" in singular forms as used in the description of the present disclosure and in the appended claims are also intended to cover plural forms, unless specified clearly otherwise in the context.
It should be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more relevant items listed, and includes such combinations.
It should be understood that the specific embodiments described herein are only used to explain the present disclosure, and are not intended to limit the present disclosure.
The radome is a structure that protects the antenna system from external environmental influences. It requires good electromagnetic wave penetration characteristics in terms of electrical performance and the ability to withstand harsh external environmental conditions in terms of mechanical performance.
Traditional radomes for communication equipment are made from thermoplastic materials like Polycarbonate (PC) through injection moulding. The properties of these materials result in a high dielectric constant, which significantly obstructs electromagnetic waves emitted by the antenna, leading to low transmission rates and affecting antenna performance.
Therefore, it is necessary to select materials with a low dielectric constant to reduce the dielectric constant of the radome. The sandwich core structure, due to its lightweight and low dielectric constant core layer, can effectively reduce the dielectric constant of the radome and is suitable for use in radome applications. A sandwich core structure typically consists of an upper skin, a lower skin, a core layer sandwiched between the upper and lower skins, and edge sealing. If conventional methods, such as adhesive bonding or screws with sealing strips, are used to assemble a complete sandwich core structure onto a traditional radome, both the transition areas and the edge sealing occupy space within the radome. This not only affects antenna performance, but also increases the size of the radome.
Thus, the embodiments of the present disclosure provide a radome and a preparation method therefor. Using the radome body, the first skin layer, and the second skin layer to protect the core layer eliminates the need for edge sealing. The entire radome can serve as a radiation region, which not only improves the antenna performance but also reduces costs by eliminating the need for edge sealing, thereby minimizing the size of the radome.
Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments may be combined with one another without conflicts.
Referring to Figs. 1-3, an embodiment of the present disclosure provides a radome 100, comprising a radome body 10 and a composite panel 20, wherein the radome body 10 is provided with a hollow region 11. The hollow region 11 has a first opening and a second opening in a first direction, and the first direction is a thickness direction of the radome body 10. The composite panel 20 comprises a core layer 21, a first skin layer 22 and a second skin layer 23, wherein the core layer 21 is embedded in the hollow region 11; the core layer 21 has a first side 211 and a second side 212 opposite to each other in a first direction; and the first skin layer 22 is sealingly attached to the first side 211 of the core layer 21, and covers the first opening of the hollow region 11. The second skin layer 23 is sealingly attached to the second side 212 of the core layer 21, and covers the second opening of the hollow region 11. The core layer 21 is made of a low dielectric constant material, and the peripheral edge of the core layer 21 extends to abut against the inner wall of the hollow region 11.
The radome 100 provided in the embodiment of the present disclosure uses a material with low dielectric constant as the core layer 21, which can effectively reduce the dielectric constant of the radome 100; the core layer 21 is directly connected to the radome body 10 without providing a sealing edge; and the core layer 21 is protected by means of the radome body 10, the first skin layer 22 and the second skin layer 23, without sealing edge. The entire radome 100 can serve as a radiation region, which not only improves the antenna performance but also reduces costs by eliminating the need for edge sealing, thereby minimizing the size of the radome 100.
In some embodiments, due to the need to adapt the radome to the shape of the antenna, the structure is relatively complex. If the entire radome is made using a sandwich core structure, the moulding process would be complicated and costly. Therefore, the radome body 10 is partially made using traditional thermoplastic materials like PC through injection moulding, which is a simple and low-cost process; and a hollow region 11 is provided in a flat portion of the radome body 10 to fix the composite panel 20, which not only effectively reduces the dielectric constant of the radome 100 but also facilitates processing and lowers costs.
In some embodiments, in the first direction, the thickness of the core layer 21 is less than or equal to the thickness of the inner wall of the hollow region 11. Exemplarily, the thickness of the core layer 21 may be consistent with he thickness of an inner wall of the hollow region 11, so that the surfaces of the first side 211 and the second side 212 of the core layer 21 are flush with openings at two sides of the hollow region 11, and the first skin layer 22 and the second skin layer 23 are tightly attached to the core layer 21, thereby achieving a better protection effect. Certainly, in other embodiments, the thickness of the core layer 21 may be smaller than that of the inner wall of the hollow region 11.
In some embodiments, as shown in Figs. 2 and 3, the radome body 10 has a first surface 12 and a second surface 13 opposite to each other in a first direction; the surface of the first skin layer 22 is flush with the first surface 12; and the surface of the second skin layer 23 is flush with the second surface 13. In the present embodiment, the above arrangement allows the surface of the radome 100 to be smooth, resulting in a more harmonious and aesthetically pleasing overall structure.
Certainly, the arrangement of the first skin layer 22 and the second skin layer 23 is not limited to that described above. For example, in other embodiments, the radome body 10 has a first surface 12 and a second surface 13 opposite to each other in the first direction; the first skin layer 22 protrudes outwards from the first surface 12 or is embedded in the first surface 12, and the second skin layer 23 protrudes outwards from the second surface 13 or is embedded in the second surface 13. In the present embodiment, the first skin layer 22 and the second skin layer 23 may also be arranged to protrude outwards or recessed inwards relative to the surface of the radome body 10, as long as they can protect the core layer 21.
In some embodiments, as shown in Figs. 3 and 4, the first surface 12 is recessed at the edge of the hollow region 11 to form a first limiting groove 121 that fits the first skin layer 22, and the first skin layer 22 is embedded in the first limiting groove 121. In the present embodiment, when the thickness of the core layer 21 is consistent with the thickness of the hollow region 11 of the radome body 10, the provision of the first limiting groove 121 enables precise positioning of the first skin layer 22. This facilitates the attachment of the first skin layer 22 to the first side 211 of the core layer 21, while ensuring that the first skin layer 22 aligns flush with the surface of the cover body 10, avoiding any protrusion. This results in a more harmonious and aesthetically pleasing overall structure.
In some embodiments, as shown in Fig. 5, the second surface 13 is recessed at the edge of the hollow region 11 to form a second limiting groove 131 that fits the second skin layer 23, and the second skin layer 23 is embedded in the second limiting groove 131. In the present embodiment, when the thickness of the core layer 21 is consistent with the thickness of the hollow region 11 of the radome body 10, the provision of the second limiting groove 131 enables precise positioning of the second skin layer 23. This facilitates the attachment of the second skin layer 23 to the second side 212 of the core layer 21, while ensuring that the second skin layer 23 aligns flush with the surface of the cover body 10, avoiding any protrusion. This results in a more harmonious and aesthetically pleasing overall structure.
Certainly, the radome 100 of the present disclosure may also be designed without the first limiting groove 121 and the second limiting groove 131. In such cases, the first skin layer 22 and the second skin layer 23 can be configured to protrude outwards, or the cross-sectional dimensions of the first skin layer 22 and the second skin layer 23 can be made consistent with those of the core layer 21. In this case, the edges of the first skin layer 22 and the second skin layer 23 abut against the inner wall of the hollow region 11. The combined thickness of the first skin layer 22, the second skin layer 23 and the core layer 21 is equal to the thickness of the hollow region 11. This ensures that the first skin layer 22 and the second skin layer 23 are flush with the surface of the radome body 10, while still providing protection to the core layer 21.
In some embodiments, to adapt to specific usage scenarios, the hollow structure can be provided on one side of the radome body 10 along its extension direction, such as the left side in the usage state shown in Fig. 3. However, in other embodiments, the hollow structure can also be provided on the right side, upper side, lower side, or in the middle of the radome body 10, or at any other position.
In some embodiments, as shown in Figs. 1 to 3, to adapt to specific usage scenarios, the radome body 10 can be extended in a second direction, and the composite panel 20 can be extended in a third direction. The second direction and the third direction are in the same horizontal plane and are perpendicular to each other. Additionally, both the second direction and the third direction are perpendicular to the first direction. In the present embodiment, by means of the aforementioned configuration, the composite panel 20 can be positioned close to the edge of the radome body 10. Certainly, in other embodiments, the extension direction of the composite panel 20 may also be arranged non-perpendicularly to the extension direction of the cover body 10, such as being aligned with the extension direction of the cover body 10.
In some embodiments, the second skin layer, the second skin layer, the core layer and the radome body are integrally formed to allow the first skin layer, the second skin layer and the radome body to integrally enclose the outer surface of the core layer. In the present embodiment, by means of the described arrangement, the radome of the present disclosure does not need additional sealing edges, and the radome body, the first skin layer and the second skin layer of the radome are integrally formed to protect the core layer.
Exemplarily, the composite panel 20 and the radome body 10 can be fixed together through adhesive bonding or thermal pressing. In the present embodiment, fixing the composite panel 20 to the radome body 10 through thermal pressing can ensure a compact bond between the first skin layer 22, the second skin layer 23, the core layer 21, and the radome body 10, enhancing connection stability and reducing porosity.
In some embodiments, the cross-sectional dimensions of the hollow region 11 and the core layer 21 in the horizontal direction are consistent. In the present embodiment, by means of the aforementioned configuration, the radome body 10 provides a protective effect for the core layer 21 while enhancing connection stability.
In some embodiments, the cross-sectional dimensions of the first skin layer 22 and the second skin layer 23 in the horizontal direction are consistent. In the present embodiment, the above configuration not only balances both sides of the core layer 21, ensuring consistent protection effect, but also eliminates the need to distinguish between the first skin layer 22 and the second skin layer 23 during processing, thereby simplifying the manufacturing of the first skin layer 22 and the second skin layer 23.
In some embodiments, as shown in Figs. 1-3, the radome body 10 comprises a plate body 10a and a surrounding edge 10b surrounding the periphery of the plate body 10a, and the hollow structure is provided on the plate body 10a. In the present embodiment, the plate body 10a has a flat structure on both sides, and the surrounding edge 10b can extend in a direction perpendicular to the plate body 10a. The hollow region 11 is provided on the flat plate body 10a, facilitating the combination and fixation with the composite panel 20.
In some embodiments, the core layer 21 comprises aramid honeycomb and microcellular foam. In the present embodiment, the aramid honeycomb can, on one hand, restrict the flow of microcellular foam during the moulding process, preventing the microcellular foam from flowing freely and causing issues such as uneven structure or height variations. On the other hand, after moulding, the unique honeycomb structure of the aramid honeycomb ensures excellent tensile strength and impact resistance of the final product. Furthermore, during the moulding process, the volume of the aramid honeycomb increases, which effectively fills the gaps between various parts, so that connections between parts are more compact. Furthermore, the expanded volume of the aramid honeycomb can effectively reduce the mass per unit volume, thereby lowering the overall weight of the final product.
Exemplarily, the aramid honeycomb can be selected as a structure with at least two layers, where the gaps of the two layers are staggered. This staggered arranged gaps help to further restrict the flow of microcellular foam while promoting a staggered honeycomb structure in the final product. The microcellular foam solidified within the honeycomb structure can interweave vertically, similar to a woven rope, thereby enhancing the tensile strength and impact resistance of the core layer, ultimately improving the performance of the radome 100.
In some embodiments, the microcellular foam comprises at least one of polymethacrylimide foam and polypropylene foam. In the present embodiment, the polymethacrylimide foam and the polypropylene foam have low dielectric constants and dielectric losses, resulting in a core layer with high transmittance, thereby enhancing the performance of the radome 100.
In some embodiments, the microcellular foam has a density of 70 kg/m3 to 110 kg/m3. In the present embodiment, the weight of the radome 100 is reduced by means of the above selection of microcellular foam, to reduce the weight of the core layer.
In some embodiments, the dielectric constant of the microcellular foam is less than or equal to 1.2. In the present embodiment, by selecting the described microcellular foam, the resulting core layer achieves high transmittance, thereby making the overall performance of the radome 100 better.
In some embodiments, the microcellular foam has a dielectric loss of less than or equal to 0.001. In the present embodiment, by selecting the described microcellular foam, the resulting core layer achieves high transmittance, thereby making the overall performance of the radome 100 better.
Referring to Fig. 4, an embodiment of the present disclosure further provides a method for manufacturing a radome 100, comprising:

S1: providing a hollow region 11 on a radome body 10;
S2: cropping a prepreg and a light-weight low-dielectric composite material into preset shapes, wherein the prepreg is cropped to form a first skin layer 22 and a second skin layer 23, and the light-weight low-dielectric composite material is cropped to form a core layer 21;
S3: sequentially laying the first skin layer 22, the radome body 10, the core layer 21 and the second skin layer 23 in a mould, and embedding the core layer 21 in a hollow region 11 of the radome body 10, wherein the first skin layer 22 and the second skin layer 23 are respectively adhered to two opposite sides of the core layer 21 in a thickness direction, and the first skin layer 22 and the second skin layer 23 are tightly adhered to the mould;
S4: placing the mould in a moulding machine for hot pressing, so as to form the first skin layer 22, the radome body 10, the core layer 21 and the second skin layer 23 by hot pressing;
S5: after hot pressing is completed, cooling the mould, then opening the mould, and taking out the manufactured radome 100.

The method for manufacturing the radome 100 provided in the embodiment of the present disclosure uses lightweight, low-dielectric composite materials to form the core layer 21, which effectively reduces the dielectric constant of the radome 100; and the radome body 100 of the radome 10 is hot-pressed with the first skin layer 22 and the second skin layer 23 to protect the core layer 21, eliminating the need for additional edge sealing to protect the core layer 21. The entire radome 100 can serve as a radiation region, offering excellent antenna performance, simple manufacturing process, low cost, and reduced dimensions of the radome 100.
Exemplarily, in step S3, the mould surface can be cleaned first, and cleaning the mould surface involves wiping with a cleaning agent, then drying and cooling to a room temperature. This can be repeated several times to ensure that the mould surface is clean with no oil stains, no droplet agglomeration, and no dust.
Exemplarily, the mould comprises an upper mould plate and a lower mould plate; the first skin layer 22, the radome body 10, the core layer 21 and the second skin layer 23 are sequentially laid in the lower mould plate. After the laying is completed, the upper mould plate is covered, and the mould is placed into a molding machine. The molding machine is preheated to a resin activation temperature, then the pressure is increased while raising the temperature; and the temperature and the pressure are maintained for a period of time.
Exemplarily, the increased pressure may be between 1.5 MPa and 10 MPa, and the duration for maintaining the temperature and the pressure is not less than 0.5 hour.
Exemplarily, after hot pressing is completed, the mould is cooled to a mould opening temperature, and the cooling rate may be 5°C/min to 20°C/min.
Exemplarily, in step S4, after the upper mold is covered, the mould is vibrated while applying heat and pressure to ensure more uniform filling of the material within the mould, thereby reducing variations in the finished product at different positions. It is also possible to fill the mould with a prepreg before the upper mould is covered, to make the surface of the first skin layer 22 more flat using the flow of the prepreg. Vibrating the mould can further accelerate the flow of the prepreg. In cases where the prepreg is additionally filled, the laying thickness of the raw material is 75-80% of the mould depth, and the volume of the filled prepreg is 1-2% of the mould volume. The spare space is reserved for the expansion of the raw material. To further ensure the flatness of the outer surface of the first skin layer 22, the mould can be inverted for the first 10 minutes of the temperature and pressure retention stage, positioning the first skin layer 22 at the bottom, and then flipped upright to place the second skin layer 23 at the top.
Exemplarily, the composite panel 20 may be machined and/or painted, with a paint thickness being about 50 µm to 100 µm.
In some embodiments, the prepreg is fiber fabrics impregnated with a resin system. In the present embodiment, impregnating with the resin system can enhance toughness of the material.
In some embodiments, the weaving form of the fiber fabric is plain weaving. In the present embodiment, the fiber cloth is woven in a plain weave pattern, which has the highest number of interweaving, making the fabric firm and wear-resistant.
In some embodiments, the fiber fabric is one of or a combination of more than one of a glass fiber fabric, a quartz fiber fabric and an aramid fiber fabric. In the present embodiment, the fiber fabric may be a low-dielectric glass fiber fabric, which has good insulation, high heat resistance, excellent corrosion resistance, and high mechanical strength. A quartz fiber fabric can also be used, which has heat resistance, corrosion resistance and flexibility, and has a high strength retention ratio at a high temperature, a stable size, thermal shock resistance, chemical stability, light transmittance and good electrical insulation properties. An aramid fiber fabric can also be used, which has a high breaking strength and a light weight.
Exemplarily, the glass fiber fabric may specifically be an E glass fiber fabric, an HL glass fiber fabric or a D glass fiber fabric.
In some embodiments, the resin system for impregnating the fiber fabric comprises one of an epoxy resin system, a vinyl resin system, and a polyurethane resin system. In the present embodiment, the epoxy resin has good adhesive property, heat resistance, chemical resistance, and excellent mechanical properties. The vinyl resin can better fuse with glass fiber while also exhibiting good antistatic properties. The polyurethane resin, when heated to form a film, exhibits good thermoplastic adhesion properties, enabling strong bonding with fiber fabrics.
In some embodiments, the volume fraction of a matrix resin in the resin system used for impregnating the fiber fabric is 30% to 42.5%. In the present embodiment, the resin system with the volume fraction is selected to impregnate the fiber fabric, so that the performance of the formed radome 100 is better.
The method for manufacturing the radome provided in the embodiment of the present disclosure uses lightweight, low-dielectric composite materials to form the core layer, which effectively reduces the dielectric constant of the radome; and the radome body of the radome is hot-pressed with the first skin layer and the second skin layer to protect the core layer, eliminating the need for additional edge sealing to protect the core layer. The entire radome can serve as a radiation region, offering excellent antenna performance, simple manufacturing process, low cost, and reduced dimensions of the radome.

Example 1

An antenna having a radome proposed in the embodiments of the present disclosure is employed as Example 1.

Comparative Example 1

Due to the reflection of electromagnetic waves on the surface of the radome and absorption within the dielectric layer of the radome, power loss occurs. Therefore, the absence of a radome, which represents the state with minimal interference, is the most ideal condition. Thus, an antenna without a radome is used as Comparative Example 1.

Comparative Example 2

An antenna with an existing radome (entirely made of PC plastic through injection molding) is used as Comparative Example 2.

The antenna patterns for Example 1, Comparative Example 1, and Comparative Example 2 are shown in Fig. 6. The specific parameters corresponding to Fig. 6 are listed in Table 1. In Fig. 6, the horizontal axis represents the angle, and the vertical axis represents the antenna gain. From Fig. 6 and Table 1, it can be observed that between -90° and 90°, the beam shape of Example 1 is closer to the beam shape of Comparative Example 1 (without a radome) compared to Comparative Example 2. This is particularly evident between 50° and 90°, where the beam shape of Comparative Example 2 exhibits significant deformation, while the beam shape of Example 1 is close to that of Comparative Example 1. This indicates that the radome proposed in the embodiments of the present disclosure results in lower power loss and less interference when applied to the antenna, thereby enhancing antenna performance.

Table 1

Angle	Antenna Gain (Emboidment1)	Antenna Gain (Comparative Example 1)	Antenna Gain (Comparative Example 2)
-90°	-70.23	-68.19	-70.5
-80°	-64.69	-60.53	-66.82
-70°	-56.89	-54.63	-59.86
-60°	-54.28	-53.68	-53.62
-50°	-67.59	-65.04	-67.3
-40°	-52.15	-53.15	-53.06
-30°	-59.78	-60.12	-66.22
-20°	-52.11	-52.28	-51.1
-10°	-56.45	-55.06	-72.31
0°	-61.71	-61.47	-59.78
10°	-50.1	-51.09	-52.71
20°	-52.09	-51.43	-50.95
30°	-55.12	-54.59	-52.8
40°	-40.68	-40.31	-40.35
50°	-35.3	-35.7	-34.6
60°	-38.31	-37.84	-39.64
70°	-47.57	-43.68	-53.35
80°	-57.87	-52.27	-59.77
90°	-65.48	-64.65	-79.15

The described embodiments of the present disclosure are only for description, but do not denote the preference of the embodiments. The foregoing descriptions are merely specific embodiments of the present disclosure, but are not intended to limit the scope of protection of the present disclosure. A person skilled in the art would have readily conceived of modifications or replacements within the technical scope disclosed in the embodiments of the present application, and the modifications or replacements shall all belong to the scope of protection of the present disclosure. Thus, the scope of protection of the present disclosure shall be subject to the scope of protection of the claims.

Claims

A radome, comprising a radome body and a composite panel, wherein the radome body is provided with a hollow region, the hollow region has a first opening and a second opening in a first direction, and the first direction is a thickness direction of the radome body;
the composite panel comprises:
a core layer embedded in the hollow region, the core layer having a first side and a second side opposite to each other in the first direction;

a first skin layer, sealingly attached to the first side of the core layer and covering the first opening;

a second skin layer, sealingly attached to the second side of the core layer and covering the second opening;

wherein the core layer is made of a low dielectric constant material, and the peripheral edge of the core layer extends to abut against the inner wall of the hollow region.
The radome according to claim 1, wherein in the first direction, a thickness of the core layer is less than or equal to a thickness of an inner wall of the hollow region.
The radome according to claim 1, wherein the radome body has a first surface and a second surface opposite to each other in the first direction; a surface of a first skin layer is flush with the first surface; and a surface of a second skin layer is flush with the second surface; or,
the radome body has a first surface and a second surface opposite to each other in the first direction; the first skin layer protrudes outwards from the first surface or is embedded in the first surface, and the second skin layer protrudes outwards from the second surface or is embedded in the second surface.
The radome according to claim 3, wherein the first surface is recessed at the edge of the hollow region to form a first limiting groove that fits the first skin layer, and the first skin layer is embedded in the first limiting groove; and/or,
the second surface is recessed at the edge of the hollow region to form a second limiting groove that fits the second skin layer, and the second skin layer is embedded in the second limiting groove.
The radome according to claim 1, wherein the first skin layer, the second skin layer, the core layer and the radome body are integrally formed to allow the first skin layer, the second skin layer and the radome body to integrally enclose the outer surface of the core layer.
The radome according to any one of claims 1 to 5, wherein the core layer comprises aramid honeycomb and microcellular foam.
The radome according to claim 6, wherein the microcellular foam comprises at least one of polymethacrylimide foam and polypropylene foam; and/or,
the density of the microcellular foam is 70 kg/m³ to 110 kg/m³; and/or,

the dielectric constant of the microcellular foam is less than or equal to 1.2; and/or,

the microcellular foam has a dielectric loss of less than or equal to 0.001.
A preparation method for a radome, comprising:
providing a hollow region on a radome body;

cropping a prepreg and a light-weight low-dielectric composite material into preset shapes, wherein the prepreg is cropped to form a first skin layer and a second skin layer, and the light-weight low-dielectric composite material is cropped to form a core layer;

sequentially laying the first skin layer, the radome body, the core layer and the second skin layer in a mould, and embedding the core layer in a hollow region of the radome body, wherein the first skin layer and the second skin layer are respectively adhered to two opposite sides of the core layer in a thickness direction, and the first skin layer and the second skin layer are tightly adhered to the mould;placing the mould in a moulding machine for hot pressing, so as to form the first skin layer, the radome body, the core layer and the second skin layer by hot pressing;

after hot pressing is completed, cooling the mould, then opening the mould, and taking out the manufactured radome.
The preparation method according to claim 8, wherein the prepreg is fiber fabrics impregnated with a resin system.
The preparation method according to claim 9, wherein the weaving form of the fiber fabric is plain weaving; and/or,
the fiber fabric is one of or a combination of more than one of a glass fiber fabric, a quartz fiber fabric and an aramid fiber fabric; and/or,

the resin system for impregnating the fiber fabric comprises one of an epoxy resin system, a vinyl resin system, and a polyurethane resin system; and/or,

the volume fraction of a matrix resin in the resin system used for impregnating the fiber fabric is 30% to 42.5%.