CN110474153B - Flexible high-precision parabolic antenna and preparation method thereof - Google Patents
Flexible high-precision parabolic antenna and preparation method thereof Download PDFInfo
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- CN110474153B CN110474153B CN201910702744.0A CN201910702744A CN110474153B CN 110474153 B CN110474153 B CN 110474153B CN 201910702744 A CN201910702744 A CN 201910702744A CN 110474153 B CN110474153 B CN 110474153B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
Abstract
The utility model provides a flexible high accuracy parabolic antenna, from the bottom up is flexible sealed thin film layer, flexible hot melt adhesive film layer, flexible parabolic antenna layer, flexible hot melt adhesive film layer, flexible sealed thin film layer in proper order. The invention further provides a preparation method of the flexible high-precision parabolic antenna, and 1) an invar mould is processed and manufactured; 2) selecting materials of a flexible sealing film layer, a flexible hot melt adhesive film layer and a flexible parabolic antenna layer for standby; 3) placing the mold into an oven for preheating; 4) laying layers on the surface of the preheated mould; 5) after the layering is finished, vacuumizing, simultaneously putting the mould into an oven, and preserving heat for 30 minutes after the temperature of the mould is raised to 140 ℃; 6) and continuously vacuumizing and cooling to room temperature, demoulding, and finally trimming the edge to prepare the high-precision parabolic antenna. The invention solves the problems of poor reflecting surface precision and difficult control of the traditional flexible parabolic antenna after the traditional flexible parabolic antenna passes through a plane fitting curved surface, and has the advantages of integrated forming, one-step curing, low cost and capability of forming large-size flexible reflecting surface products.
Description
Technical Field
The invention relates to a flexible high-precision parabolic antenna and a preparation method thereof, belongs to the technical field of functional composite materials and processes, and is applied to the technical field of radar antennas.
Background
In satellite communication, parabolic antenna is a common antenna form, and it possesses simple structure, the efficient advantage of antenna, and traditional parabolic antenna most is rigid structure, generally adopts metal materials such as aluminum alloy to make, and its quality is overweight, and inconvenient folding is carried to it is poor to have the mobility, and the operation is complicated consuming time, and the precision receives the shortcoming such as the assembly effect influences greatly. Some parabolic antennas also adopt a flexible foldable structure, but the profile precision of the paraboloid is poor, which is shown in that the molding process is to perform split unfolding on the paraboloid through commercial software such as Catia and the like, and then to mold in a lap joint or butt joint connection mode, so that the split bonding part is easy to damage, namely the reliability is poor, and the requirement of repeated use cannot be met.
Among factors influencing the gain of the flexible parabolic antenna, the higher the frequency is, the shorter the wavelength is, and the larger the gain loss is; the larger the surface error is, the larger the gain loss is; especially, when the antenna works under the condition of high frequency (above a Ku frequency band), the main electrical performance indexes of the antenna are greatly influenced due to the accuracy of the curved surface error. Therefore, how to reduce the curve error of the flexible parabolic antenna is the key to effectively improve the antenna gain.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a flexible high-precision parabolic antenna and a preparation method thereof.
The above purpose of the invention is realized by the following technical scheme:
a flexible high-precision parabolic antenna comprises a flexible sealing film layer, a flexible hot melt adhesive film layer, a flexible parabolic antenna layer, a flexible hot melt adhesive film layer and a flexible sealing film layer from bottom to top in sequence; the thickness of the flexible sealing thin film layer is 0.05-0.2 mm, the thickness of the flexible hot melt adhesive film layer is 0.1-0.15 mm, the flexible parabolic antenna layer is of an integrated forming structure, and the thickness of the flexible parabolic antenna layer is 0.05-0.15 mm.
The flexible sealing film layer is made of thermoplastic polyurethane, the melting point is 150-180 ℃, and the flexible sealing film layer can resist temperature of-45-80 ℃.
The flexible hot melt adhesive film layer is made of a thermoplastic polyurethane adhesive film, and the hot melt temperature is 100-110 ℃.
The flexible parabolic antenna layer is made of elastic cloth woven by metal-plated fibers.
The fiber is spandex, chinlon or terylene.
The plating metal of the fiber is gold, silver, copper, aluminum or nickel.
The elastic cloth woven by the metal-plated fibers is two-side elastic or four-side elastic.
The preparation method of the flexible high-precision parabolic antenna comprises the following steps:
step 801: processing and manufacturing an invar steel die;
step 802: respectively selecting a flexible sealing film layer material, a flexible hot melt adhesive film layer and a flexible parabolic antenna layer material for standby;
step 803: placing the die into an oven to preheat to 60-80 ℃;
step 804: laying layers on the preheated mould surface according to the sequence of a flexible sealing film layer, a flexible hot melt adhesive film layer, a flexible parabolic antenna layer, a flexible hot melt adhesive film layer and a flexible sealing film layer;
step 805: vacuumizing after the layering is finished, simultaneously putting the mould into an oven, keeping the temperature for 30 minutes after the temperature of the mould is raised to 140 ℃, and opening the oven door;
step 806: and continuously vacuumizing and cooling to room temperature, demoulding, and finally trimming the edge to prepare the high-precision parabolic antenna.
The invar steel die is a steel die and comprises a male die, a pressure ring and a hanging ring, wherein the male die is of a paraboloid structure, and a flange plate is designed along the periphery of the paraboloid structure; 4 hanging rings are symmetrically distributed on the side surface of the flange plate, and a lifting appliance is installed on the hanging rings and used for moving the mold to enter and exit the oven; the compression ring is positioned on the male die flange, the inner diameter and the outer diameter of the compression ring are the same as the inner diameter and the outer diameter of the flange, when the parabolic antenna is formed, the layers are laid on the surface of the parabolic structure according to the sequence of the flexible sealing film layer, the flexible hot melt adhesive film layer, the flexible parabolic antenna layer, the flexible hot melt adhesive film layer and the flexible sealing film layer, and after the layers are laid, the compression ring is fixed.
And a temperature sensor is pasted on the side surface of the flange plate and used for detecting the temperature of the die.
Compared with the prior art, the invention has the advantages that:
1. after the invention is adopted, the selection range of the parabolic antenna material is larger, and the two-side elastic or four-side elastic cloth of gold-plated, silver, copper, aluminum or nickel fiber can be adopted according to the different requirements of the service performance and the environmental performance of the product.
2. In the integrated molding process, whether the flexible sealing film layer is processed or the parabolic antenna layer is processed, the flexible sealing film layer and the parabolic antenna layer can be effectively controlled through the mold according to the molded shape, and the problem of shape mismatching of parabolic antennas with different specifications is solved.
3. The weight of the flexible high-precision parabolic antenna is only one twentieth of that of the parabolic antenna made of the existing metal or composite materials (such as carbon fiber materials and the like), and the parabolic antenna is even lighter. Meanwhile, due to the fact that the flexible material is selected, the antenna has good shape following performance, can be folded to be small, greatly provides the portability, and lays a solid material and a forming process foundation for the lightweight, large-scale and foldable parabolic antenna.
4. The flexible parabolic antenna layer is integrally formed, a split structure does not exist, the problems that the reflecting surface of the traditional flexible parabolic antenna is poor in precision and difficult to control after the traditional flexible parabolic antenna passes through a plane fitting curved surface are solved, and the reliability of the parabolic antenna can be greatly improved. Meanwhile, the invar steel die has small deformation, the vacuum degree control, especially the cooling process, is continuously carried out in the forming process, the vacuum state is kept, the deformation and resilience phenomena of the flexible parabolic antenna layer can be avoided, and the profile precision of the parabolic antenna is greatly improved, so that the actual gain of the parabolic antenna is improved, the overall power consumption is reduced, and the working and standby time of the satellite communication system is prolonged.
5. Compared with the traditional split structure, the flexible parabolic antenna layer is integrally formed and cured at one time, so that the complexity and the processing cost are greatly reduced, the production efficiency is improved, and a large-size flexible reflecting surface product can be formed.
Drawings
FIG. 1 is a front view of an invar mold structure according to the present invention;
FIG. 2 is a left side view of the invar mold structure of the present invention;
fig. 3 is a schematic view of a layer structure of the flexible high-precision parabolic antenna according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
in order to solve the problems of poor precision and poor reliability of the profile of the flexible parabolic antenna, the invention introduces an integrated molding process of the parabolic antenna, has simple preparation method and low cost, and can form a large-size flexible reflecting surface product.
The flexible high-precision parabolic antenna of the invention is a symmetrical structure taking a flexible parabolic antenna layer as a center, and as shown in figure 3, the sequence (from bottom to top) of spreading layers from the surface of a male die 1 to the outside is as follows: flexible sealing film layer 4, flexible hot melt adhesive film layer 5, flexible parabolic antenna layer 6, flexible hot melt adhesive film layer 5, flexible sealing film layer 4. The thickness of the flexible sealing thin film layer is 0.05-0.2 mm, the thickness of the flexible hot melt adhesive film layer is 0.1-0.15 mm, the flexible parabolic antenna layer is of an integrated forming structure, and the thickness of the flexible parabolic antenna layer is 0.05-0.15 mm.
The flexible sealing film layer is made of thermoplastic polyurethane, the melting point is 150-180 ℃, and the temperature resistance is-45-80 ℃. The air leakage of the flexible parabolic antenna layer is prevented, and sealing is realized.
The flexible hot melt adhesive film layer is made of thermoplastic polyurethane, and the hot melt temperature is 100-110 ℃. For adhesive curing of the flexible sealing film layer 4 and the flexible parabolic antenna layer 6.
The parabolic antenna layer material is elastic cloth woven by metal-plated fibers. The fiber is spandex, chinlon or terylene; the plating metal of the fiber is gold, silver, copper, aluminum or nickel; the elastic cloth woven by the metal-plated fibers is two-side elastic or four-side elastic.
The preparation method of the flexible high-precision parabolic antenna comprises the following steps:
step (I): processing and manufacturing an invar steel mould, and cleaning the surface of the mould by using acetone;
step (II): respectively selecting a flexible sealing film material, a flexible hot melt adhesive film and a flexible parabolic antenna material for standby;
step (three): placing the mold into an oven for preheating;
step (IV): and brushing a release agent on the surface of the preheated mould, and paving the flexible sealing film layer, the flexible hot melt adhesive film layer, the flexible parabolic antenna layer, the flexible hot melt adhesive film layer and the flexible sealing film layer in sequence.
Step (V): after the layering is finished, vacuumizing, simultaneously putting the mould into an oven, and preserving heat for 30 minutes after the temperature of the mould is raised to 140 ℃;
step (six): and continuously vacuumizing and cooling to room temperature, demoulding, and finally trimming the edge to prepare the high-precision parabolic antenna.
As shown in fig. 1 and fig. 2, which are a front view and a left view of the invar mold of the present invention, it can be seen that the invar mold comprises a male mold 1, a hanging ring 2 and a pressing ring 3, wherein the male mold 1 is of a parabolic structure, and a flange is designed along the circumferential direction of the parabolic structure; 4 hanging rings 2 are symmetrically distributed on the side surface of the flange plate, and a lifting appliance is arranged on the hanging rings 2 and used for moving the mold to enter and exit the oven; the compression ring 3 is located on the flange plate of the male die 1, the inner diameter and the outer diameter of the compression ring 3 are the same as those of the flange plate, when the parabolic antenna is formed, the layers are laid on the surface of the parabolic structure according to the sequence of the flexible sealing film layer, the flexible hot melt adhesive film layer, the flexible parabolic antenna layer, the flexible hot melt adhesive film layer and the flexible sealing film layer, and after the laying is completed, the compression ring 3 is fixed. The material of the invar steel mold in this embodiment is a steel mold.
Example (b):
the flexible sealing film layer 4 is made of thermoplastic polyurethane film, the melting point of the thermoplastic polyurethane film is 150 ℃, and the thickness of the thermoplastic polyurethane film is 0.1 mm. The flexible hot melt adhesive film layer 5 is made of a thermoplastic polyurethane adhesive film, the melting point of the thermoplastic polyurethane adhesive film is 110 ℃, and the thickness of the thermoplastic polyurethane adhesive film is 0.15 mm. The flexible parabolic antenna layer 6 is made of four-side elastic cloth woven by nylon silver-plated fibers and is 0.1mm thick.
The preparation method of the flexible high-precision parabolic antenna in the embodiment comprises the following steps:
step (I): processing and manufacturing an invar steel mould, and cleaning the surface of the mould by using acetone;
step (II): respectively selecting a flexible sealing film layer material, a flexible hot melt adhesive film layer and a flexible parabolic antenna layer material for standby;
step (three): placing the invar steel mould into an oven to be preheated to 70 ℃;
step (IV): brushing a release agent on the surface of a preheated male die 1 of the invar steel die, laying layers on the surface of the male die 1 according to the sequence of a flexible sealing film layer, a flexible hot melt adhesive film layer, a flexible parabolic antenna layer, a flexible hot melt adhesive film layer and a flexible sealing film layer, and fixing the male die through a compression ring 3 after laying layers.
Step (V): vacuumizing after layering is finished, simultaneously moving the mold into an oven by using a lifting appliance, keeping the temperature for 30 minutes after the temperature of the mold is raised to 140 ℃, and opening the oven door;
step (six): and (4) continuously vacuumizing and cooling to room temperature, then demoulding, preventing the mould from being cooled to influence the profile precision of the flexible parabolic antenna, moving the mould out of the oven by using a lifting appliance, and finally trimming the edge to prepare the high-precision parabolic antenna.
Through tests, the aperture of the flexible high-precision parabolic antenna in the embodiment is 0.6 meter, the weight of the antenna is 450g, and the profile precision of the antenna is 0.05 mm. Compared with the traditional method for manufacturing the parabolic antenna with the traditional caliber, the method has the advantages that the weight is obviously reduced, and the profile precision is obviously improved.
The invention solves the problems of poor reflecting surface precision and difficult control of the traditional flexible parabolic antenna after the traditional flexible parabolic antenna passes through a plane fitting curved surface, and has the advantages of integrated forming, one-step curing, low cost and capability of forming large-size flexible reflecting surface products.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any equivalent changes or substitutions that can be made by those skilled in the art without changing the functions of the components, the positional relationships and the connection modes of the present invention within the technical scope of the present invention are included in the technical scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. A flexible high-precision parabolic antenna is characterized in that a flexible sealing film layer, a flexible hot melt adhesive film layer, a flexible parabolic antenna layer, a flexible hot melt adhesive film layer and a flexible sealing film layer are sequentially arranged from bottom to top; the thickness of the flexible sealing film layer is 0.05-0.2 mm, the thickness of the flexible hot melt adhesive film layer is 0.1-0.15 mm, and the thickness of the flexible parabolic antenna layer is 0.05-0.15 mm;
the preparation method of the flexible high-precision parabolic antenna comprises the following steps:
step 801: processing and manufacturing an invar steel die;
step 802: respectively selecting a flexible sealing film layer material, a flexible hot melt adhesive film layer and a flexible parabolic antenna layer material for standby;
step 803: placing the die into an oven to preheat to 60-80 ℃;
step 804: laying layers on the preheated mould surface according to the sequence of a flexible sealing film layer, a flexible hot melt adhesive film layer, a flexible parabolic antenna layer, a flexible hot melt adhesive film layer and a flexible sealing film layer;
step 805: vacuumizing after the layering is finished, simultaneously putting the mould into an oven, keeping the temperature for 30 minutes after the temperature of the mould is raised to 140 ℃, and opening the oven door;
step 806: and continuously vacuumizing and cooling to room temperature, demoulding, and finally trimming the edge to prepare the high-precision parabolic antenna.
2. The flexible high-precision parabolic antenna according to claim 1, wherein the flexible sealing film layer is made of a thermoplastic polyurethane material, has a melting point of 150-180 ℃, and is resistant to a temperature of-45-80 ℃.
3. The flexible high-precision parabolic antenna according to claim 1, wherein the flexible hot melt adhesive film layer is made of a thermoplastic polyurethane adhesive film, and the hot melt temperature is 100-110 ℃.
4. The flexible high-precision parabolic antenna of claim 1, wherein the flexible parabolic antenna layer material is a stretch cloth woven from metallized fibers.
5. The flexible high-precision parabolic antenna according to claim 4, characterized in that the fiber is spandex, chinlon or dacron.
6. A flexible high-precision parabolic aerial according to claim 4, characterised in that the plated metal of the fibres is gold, silver, copper, aluminium or nickel.
7. The flexible high-precision parabolic antenna of claim 4, wherein the elastic cloth woven by the metal-plated fiber is two-side elastic or four-side elastic.
8. The flexible high-precision parabolic antenna according to claim 1, wherein the invar steel mold is a steel mold and comprises a male mold (1), a pressing ring (3) and a hanging ring (2), wherein the male mold (1) is of a parabolic structure, and a flange plate is designed along the circumferential direction of the parabolic structure; 4 hanging rings (2) are symmetrically distributed on the side surface of the flange plate, and the lifting appliance is arranged on the hanging rings (2) and used for moving the mold to enter and exit the oven; the compression ring (3) is located on the male die (1) flange plate, the inner diameter and the outer diameter of the compression ring (3) are the same as those of the flange plate, when the parabolic antenna is formed, layers are laid on the surface of the parabolic structure according to the sequence of the flexible sealing film layer, the flexible hot melt adhesive film layer, the flexible parabolic antenna layer, the flexible hot melt adhesive film layer and the flexible sealing film layer, and after the layers are laid, the compression ring (3) is fixed.
9. The flexible high-precision parabolic antenna of claim 8, wherein a temperature sensor is affixed to the flange side for sensing mold temperature.
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| CN111079312B (en) * | 2019-12-31 | 2022-04-12 | 清华大学 | Inflatable film developable parabolic antenna and acquisition method thereof |
| CN111864403B (en) * | 2020-06-30 | 2022-05-03 | 上海复合材料科技有限公司 | High-precision reflecting surface forming method |
| CN114552169B (en) * | 2022-04-25 | 2022-07-05 | 中国电子科技集团公司第二十九研究所 | Construction method of broadband curved surface conformal radio frequency functional circuit assembly |
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