Preparation method of multilayer dielectric lens and multilayer dielectric lens

Abstract

The invention relates to a preparation method of a multi-layer dielectric lens and the multi-layer dielectric lens, and is applied to the technical field of lenses, and the method comprises the steps: obtaining design parameters of the multi-layer dielectric lens; according to the dielectric constant of the dielectric lens material and the dielectric constant of each dielectric layer, calculating the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer; and calculating the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, and on the basis of the number of the multiple dielectric layers, the radius of each dielectric layer, the side length of the lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, using a dielectric lens material, 3D printing is conducted layer by layer from the innermost dielectric layer to the outermost dielectric layer, and multiple dielectric layers are obtained; and based on the radius and the central angle of the reflecting layer, the reflecting layer is subjected to 3D printing by using a metal material, and the multiple dielectric layers and the reflecting layer are assembled to obtain the multilayer dielectric lens. The precision requirement of the high-frequency Luneberg lens can be met.

Description

Technical Field

[0001] The present application relates to the field of lens technology, and in particular to a method for preparing a multilayer dielectric lens and a multilayer dielectric lens. Background Art

[0002] The Luneburg lens is a sphere with a dielectric constant that changes gradually from the inside to the outside, and has a radial distribution characteristic of dielectric constant that does not exist in nature. In order to simulate this kind of continuously gradient dielectric constant material, an onion-shaped layered concentric discrete spherical shell structure is usually used.

[0003] In the related art, the structure of the Luneburg lens includes an inner core, a conductive layer and a foaming material layer. By controlling the thickness of the foaming material layer, spherical dielectric materials of different sizes can be produced. However, this method involves mold making, multiple processes and complex process control, which makes production difficult and is difficult to meet the precision requirements of high-frequency Luneburg lenses. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a method for preparing a multilayer dielectric lens and a multilayer dielectric lens.

[0005] According to a first aspect of the present application, a method for preparing a multilayer dielectric lens is provided, the method comprising:

[0006] Obtaining design parameters of the multilayer dielectric lens, the design parameters including: the number of multilayer dielectric layers, the radius of each dielectric layer, the dielectric constant of each dielectric layer, the radius of the reflection layer and the central angle of the reflection layer, wherein the dielectric constant of the multilayer dielectric layer gradually decreases from the inner layer to the outer layer;

[0007] According to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer, the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer is calculated; the side length of the lattice is positively correlated with the wavelength corresponding to the working frequency of the multi-layer dielectric lens;

[0008] According to the filling rate of the dielectric lens material in the cubic lattice contained in each dielectric layer, the side length of the square bottom surface of the hollow cuboid in the cubic lattice contained in each dielectric layer is calculated, wherein the hollow cuboid runs through the entire cubic lattice from left to right;

[0009] Based on the number of the multi-layer dielectric layers, the radius of each dielectric layer, the side length of the cube lattice, and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, the dielectric lens material is used to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain the multi-layer dielectric layer;

[0010] Based on the radius of the reflection layer and the central angle of the reflection layer, the reflection layer is 3D printed using a pre-selected metal material, and the multi-layer dielectric layer and the reflection layer are assembled to obtain a multi-layer dielectric lens.

[0011] Optionally, the multilayer dielectric lens is a cylindrical multilayer dielectric lens, the radius of each dielectric layer is the radius of the circle of each dielectric layer, and the design parameters further include: the height of the cylindrical multilayer dielectric lens;

[0012] The method of obtaining the multi-layer dielectric layer by 3D printing layer by layer from the innermost dielectric layer to the outermost dielectric layer using the dielectric lens material based on the number of dielectric layers, the radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer specifically includes:

[0013] Based on the number of multi-layer dielectric layers, the radius of each dielectric layer, the side length of the cube lattice, the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, and the height of the cylindrical multi-layer dielectric lens, the dielectric lens material is used to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain a cylindrical multi-layer dielectric layer;

[0014] The method of 3D printing the reflective layer using a pre-selected metal material based on the radius of the reflective layer and the center angle of the reflective layer, and assembling the multi-layer dielectric layer and the reflective layer to obtain the multi-layer dielectric lens specifically includes:

[0015] Based on the radius of the reflection layer, the central angle of the reflection layer and the height of the cylindrical multilayer dielectric lens, the reflection layer is 3D printed using a pre-selected metal material, and the cylindrical multilayer dielectric layer and the reflection layer are assembled to obtain a cylindrical multilayer dielectric lens.

[0016] Optionally, the multi-layer dielectric lens is a Luneburg lens, and the radius of each dielectric layer is the radius of a sphere;

[0017] The method of obtaining the multi-layer dielectric layer by 3D printing layer by layer from the innermost dielectric layer to the outermost dielectric layer using the dielectric lens material based on the number of dielectric layers, the radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer specifically includes:

[0018] Based on the number of multi-layer dielectric layers, the spherical radius of each dielectric layer, the side length of the cube lattice, and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, 3D printing is performed layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain two hemispherical multi-layer dielectric layers, and the two hemispherical multi-layer dielectric layers are pasted to obtain a spherical multi-layer dielectric layer;

[0019] The step of assembling the multi-layer dielectric layer and the reflective layer to obtain the multi-layer dielectric lens specifically includes:

[0020] The spherical multilayer dielectric layer and the reflective layer are assembled to obtain a Luneburg lens.

[0021] Optionally, the multilayer dielectric lens includes three dielectric layers, the radius of the first dielectric layer is 2.268 mm, and the dielectric constant of the first dielectric layer is 1.96; the radius of the second dielectric layer is 3.706 mm, and the dielectric constant of the second dielectric layer is 1.7956; the radius of the third dielectric layer is 5.292 mm, and the dielectric constant of the third dielectric layer is 1.4884.

[0022] Optionally, the dielectric constant of the dielectric lens material is 2.45, the filling rate of the dielectric lens material in the cube lattice contained in the first dielectric layer is 74.4%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the first dielectric layer is 0.506 mm; the filling rate of the dielectric lens material in the cube lattice contained in the second dielectric layer is 64.3%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the second dielectric layer is 0.597 mm; the filling rate of the dielectric lens material in the cube lattice contained in the third dielectric layer is 43%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the third dielectric layer is 0.755 mm.

[0023] Optionally, the radius of the reflective layer of the cylindrical multilayer dielectric lens is 12.184 mm, and the central angle of the reflective layer is 180°.

[0024] Optionally, the height of the cylindrical multilayer dielectric lens is 39 mm.

[0025] Optionally, the radius of the reflective layer of the Luneburg lens is 6.092 mm, and the central angle of the reflective layer is 120°.

[0026] Optionally, the operating frequency of the multilayer dielectric lens is 77 GHz, and the side length of the lattice is 1 mm.

[0027] According to a second aspect of the present application, a multilayer dielectric lens is provided. The multilayer dielectric lens is prepared based on the method described in the first aspect.

[0028] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0029] The dielectric constant of the multilayer dielectric is equivalent to the gradient change from the inside to the outside using a lattice. According to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer in the pre-designed multilayer dielectric lens, the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer is calculated. Then the parameters of the lattice (i.e., the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer) are calculated. 3D printing is performed based on the parameters of the lattice to obtain a dielectric layer with an equivalent dielectric constant, thereby realizing the preparation of a multilayer dielectric lens (such as a Luneburg lens). The side length of the cube lattice is positively correlated with the wavelength corresponding to the operating frequency of the multilayer dielectric lens. If the operating frequency is in the high frequency band, the corresponding wavelength is shorter, and the lattice structure is smaller. Therefore, the dielectric constant equivalent method of a special lattice can solve the problem of dielectric constant equivalence of a high-frequency Luneburg lens. At the same time, the preparation of Luneburg lenses can be realized by 3D printing, and the preparation method is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a flow chart of a method for preparing a multilayer dielectric lens in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the structure of a cube lattice in an embodiment of the present application;

[0034] Figure 3 This is a flow chart of a method for preparing a cylindrical multilayer dielectric lens in an embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of a three-dimensional structure of a partial cross-section of a cylindrical multilayer dielectric lens in an embodiment of the present application;

[0036] Figure 5 Flow chart of the method for preparing the Luneburg lens in the embodiment of the present application;

[0037] Fig. 6A This is a schematic diagram of the structure of the first dielectric layer in the Luneburg lens in the embodiment of the present application;

[0038] Figure 6B This is a schematic diagram of the structure of the second dielectric layer in the Luneburg lens in the embodiment of the present application;

[0039] Figure 6C This is a schematic diagram of the structure of the third dielectric layer in the Luneburg lens in the embodiment of the present application;

[0040] Figure 7 It is a schematic diagram of the three-dimensional structure of a partial cross-section of a Luneburg lens in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0043] The multilayer dielectric lens of the embodiment of the present application includes: a cylindrical multilayer dielectric lens and a Luneburg lens. The multilayer dielectric lens includes multiple dielectric layers and a reflective layer, and the dielectric constant of the multiple dielectric layers gradually decreases from the inner layer to the outer layer. The reflective layer of the cylindrical multilayer dielectric lens is a metal cylindrical surface structure, and the reflective layer of the Luneburg lens is a metal spherical surface structure.

[0044] See also Figure 1 , Figure 1 The flowchart of the method for preparing the multilayer dielectric lens in the embodiment of the present application may include the following steps:

[0045] Step S102, obtaining design parameters of the multilayer dielectric lens.

[0046] Before preparing a multilayer dielectric lens, designers can determine the design parameters of the multilayer dielectric lens according to requirements. The design parameters include: the number of multilayer dielectric layers, the radius of each dielectric layer, the dielectric constant of each dielectric layer, the radius of the reflective layer, and the central angle of the reflective layer. Optionally, the multilayer dielectric lens can include three dielectric layers, the radius of the first dielectric layer is 2.268 mm, and the dielectric constant of the first dielectric layer is 1.96; the radius of the second dielectric layer is 3.706 mm, and the dielectric constant of the second dielectric layer is 1.7956; the radius of the third dielectric layer is 5.292 mm, and the dielectric constant of the third dielectric layer is 1.4884.

[0047] Step S104, calculating the filling rate of the dielectric lens material in the cubic lattice contained in each dielectric layer according to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer.

[0048] The pre-selected dielectric lens material is a material that can be 3D printed, and the dielectric lens material is used for 3D printing to finally obtain a multi-layer dielectric lens. The dielectric constant of the dielectric lens material is usually different from the dielectric constant of each dielectric layer. Therefore, through the equivalent medium theory, the filling rate of the dielectric lens material in the cubic lattice contained in each dielectric layer can be calculated. The dielectric constant of the lattice of the dielectric lens material with this filling rate is equal to the dielectric constant of the dielectric layer.

[0049] The equivalent medium theory can be expressed as the following formula:

[0050]

[0051] Among them, ε eff represents the equivalent dielectric constant, ε i represents the dielectric constant of the dielectric lens material, ε m Indicates the dielectric constant of the filler, the filler is air, that is, ε m represents the dielectric constant of air, δ i Indicates the filling rate of the dielectric lens material.

[0052] Each dielectric layer has a different equivalent dielectric constant, so the filling rate of the dielectric lens material in the lattice calculated for each layer is also different.

[0053] In the embodiment of the present application, the side length of the lattice is positively correlated with the wavelength corresponding to the operating frequency of the multilayer dielectric lens. The higher the operating frequency, the shorter the corresponding wavelength, and the smaller the side length of the lattice. Through theoretical analysis, when the side length of the lattice is less than 1 / 10 of the wavelength, the radar reflection cross-sectional area of ​​the prepared multilayer dielectric lens is the largest. Through experiments, it was found that when the side length of the lattice is 1 / 4 of the wavelength, a better effect can also be achieved. Moreover, when the side length of the lattice is 1 / 4 of the wavelength, the side length is longer, and it is easier to meet the 3D printing accuracy range. For example, the operating frequency of the multilayer dielectric lens is 77GHz, the wavelength is 3.9mm, and the side length of the lattice can be 1mm.

[0054] Step S106, calculating the side length of the square bottom surface of the hollow cuboid in the cube lattice included in each dielectric layer according to the filling rate of the dielectric lens material in the cube lattice included in each dielectric layer.

[0055] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of the cube lattice in the embodiment of the present application. The lattice is obtained by subtracting a cuboid from a large cube, and the hollow cuboid runs through the entire cube lattice from left to right. The bottom surface of the hollow cuboid is the positive direction, and the height of the hollow cuboid is equal to the height of the cube. Based on the structure of this special lattice and the filling rate of the dielectric lens material in the lattice, the side length of the square bottom surface of the hollow cuboid in the cube lattice can be calculated.

[0056] Assume that the multilayer dielectric lens includes three dielectric layers, the radius of the first dielectric layer is 2.268 mm, and the dielectric constant of the first dielectric layer is 1.96; the radius of the second dielectric layer is 3.706 mm, and the dielectric constant of the second dielectric layer is 1.7956; the radius of the third dielectric layer is 5.292 mm, and the dielectric constant of the third dielectric layer is 1.4884. The dielectric constant of the dielectric lens material is 2.45, the filling rate of the dielectric lens material in the cube lattice contained in the first dielectric layer is 74.4%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the first dielectric layer is 0.506 mm; the filling rate of the dielectric lens material in the cube lattice contained in the second dielectric layer is 64.3%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the second dielectric layer is 0.597 mm; the filling rate of the dielectric lens material in the cube lattice contained in the third dielectric layer is 43%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the third dielectric layer is 0.755 mm.

[0057] Step S108, based on the number of layers of the multi-layer dielectric layer, the radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, use dielectric lens material to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain the multi-layer dielectric layer.

[0058] After all 3D printing parameters are obtained, 3D printing technology can be used to perform 3D printing layer by layer from the innermost medium layer to the outermost medium layer to obtain multiple medium layers.

[0059] Step S110, based on the radius of the reflective layer and the center angle of the reflective layer, use a pre-selected metal material to 3D print the reflective layer, and assemble the multi-layer dielectric layer and the reflective layer to obtain a multi-layer dielectric lens.

[0060] The preparation method of the multilayer dielectric lens of the embodiment of the present application adopts a lattice to make the dielectric constant of the multilayer dielectric equivalent to change from the inside to the outside. According to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer in the pre-designed multilayer dielectric lens, the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer is calculated. Then the parameters of the lattice (i.e., the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer) are calculated. 3D printing is performed based on the parameters of the lattice to obtain a dielectric layer with an equivalent dielectric constant, and the preparation of a multilayer dielectric lens (such as a Luneburg lens) is realized. The side length of the cube lattice is positively correlated with the wavelength corresponding to the operating frequency of the multilayer dielectric lens. If the operating frequency is in the high frequency band, the corresponding wavelength is shorter, and the lattice structure is smaller. Therefore, the dielectric constant equivalent method of a special lattice can solve the problem of dielectric constant equivalence of a high-frequency Luneburg lens. At the same time, the preparation of the Luneburg lens can be realized by 3D printing, and the preparation method is simpler.

[0061] In some embodiments, the multilayer dielectric lens is a cylindrical multilayer dielectric lens. Figure 3 , Figure 3 The flowchart of the method for preparing a cylindrical multilayer dielectric lens in an embodiment of the present application may include the following steps:

[0062] Step S302, obtaining design parameters of the multilayer dielectric lens.

[0063] When the multilayer dielectric lens is a cylindrical multilayer dielectric lens, the radius of each dielectric layer is the radius of the circle of each dielectric layer. Figure 1 In addition to the parameters described in the embodiment, the height of the cylindrical multilayer dielectric lens is also included. Optionally, the height of the cylindrical multilayer dielectric lens is 39 mm.

[0064] Step S304, calculating the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer according to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer.

[0065] Step S306, calculating the side length of the square bottom surface of the hollow cuboid in the cube lattice included in each dielectric layer according to the filling rate of the dielectric lens material in the cube lattice included in each dielectric layer.

[0066] The processing of steps S304 to S306 is the same as Figure 1 The processing process of step S104 to step S106 in the embodiment is the same, see Figure 1 The description in the embodiments is sufficient and will not be repeated here.

[0067] Step S308, based on the number of multi-layer dielectric layers, the radius of each dielectric layer, the side length of the cube lattice, the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, and the height of the cylindrical multi-layer dielectric lens, use dielectric lens material to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain a cylindrical multi-layer dielectric layer.

[0068] The lattice size in one direction of the cylindrical multi-layer dielectric layer is exactly the same, and no support is required during the 3D printing process. Therefore, the complete cylindrical multi-layer dielectric layer can be directly printed.

[0069] Step S310, based on the radius of the reflective layer, the central angle of the reflective layer, and the height of the cylindrical multilayer dielectric lens, use a pre-selected metal material to 3D print the reflective layer, and assemble the cylindrical multilayer dielectric layer and the reflective layer to obtain a cylindrical multilayer dielectric lens.

[0070] Optionally, the radius of the reflective layer of the cylindrical multilayer dielectric lens is 12.184 mm, and the center angle of the reflective layer is 180°. The three-dimensional structure of the prepared cylindrical multilayer dielectric lens in partial cross-section is as follows: Figure 4 shown.

[0071] In some embodiments, the multilayer dielectric lens is a Luneburg lens. Figure 5 , Figure 5 This is a flow chart of the method for preparing a Luneburg lens in an embodiment of the present application, which may include the following steps:

[0072] Step S502, obtaining design parameters of the multi-layer dielectric lens.

[0073] When the multilayer dielectric lens is a Luneburg lens, the radius of each dielectric layer in the design parameters is the spherical radius.

[0074] Step S504, calculating the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer according to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer.

[0075] Step S506, calculating the side length of the square bottom surface of the hollow cuboid in the cube lattice included in each dielectric layer according to the filling rate of the dielectric lens material in the cube lattice included in each dielectric layer.

[0076] The processing of steps S504 to S506 is the same as Figure 1 The processing process of step S104 to step S106 in the embodiment is the same, see Figure 1 The description in the embodiments is sufficient and will not be repeated here.

[0077] Step S508, based on the number of multi-layer dielectric layers, the spherical radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, 3D printing is performed layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain two hemispherical multi-layer dielectric layers, and the two hemispherical multi-layer dielectric layers are pasted to obtain a spherical multi-layer dielectric layer.

[0078] The dielectric constant inside the Luneburg lens is large, and the filling rate of the dielectric lens material is high. During the printing process, the dielectric lens material inside can play a supporting role, and no additional printing support is required. Each time half of the Luneburg lens dielectric layer is printed, that is, a hemispherical multi-layer dielectric layer is printed each time. After printing two hemispherical multi-layer dielectric layers, the two hemispherical multi-layer dielectric layers are pasted together to obtain a spherical multi-layer dielectric layer.

[0079] Step S510, based on the radius of the reflective layer and the center angle of the reflective layer, use a pre-selected metal material to 3D print the reflective layer, and assemble the spherical multilayer dielectric layer and the reflective layer to obtain a Luneburg lens.

[0080] Optionally, the radius of the reflective layer of the Luneburg lens is 6.092 mm, and the central angle of the reflective layer is 120°. When the Luneburg lens includes three dielectric layers, the structures of the first to third dielectric layers can be referred to Figure 6A to Figure 6C , it can be seen that due to the large dielectric constant inside the Luneburg lens, the filling rate of the dielectric lens material is high. A partial cross-section of the complete Luneburg lens can be seen in Figure 7 .

[0081] Compared with the Luneburg lens, the cylindrical multilayer dielectric lens has a larger RCS (radar reflection cross section) in a certain angular range, and can be directly printed, that is, the printing process is simpler. However, the working angular range of the cylindrical multilayer dielectric lens is smaller.

[0082] The embodiment of the present application also provides a multilayer dielectric lens, which is prepared based on the above method embodiment. The specific structure of the multilayer dielectric lens can be found in the description of the method embodiment, which will not be repeated here.

[0083] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0084] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a multilayer dielectric lens, characterized in that: The method comprises: Obtaining design parameters of the multilayer dielectric lens, the design parameters including: the number of multilayer dielectric layers, the radius of each dielectric layer, the dielectric constant of each dielectric layer, the radius of the reflection layer and the central angle of the reflection layer, wherein the dielectric constant of the multilayer dielectric layer gradually decreases from the inner layer to the outer layer; According to the dielectric constant of the pre-selected dielectric lens material and the dielectric constant of each dielectric layer, the filling rate of the dielectric lens material in the cube lattice contained in each dielectric layer is calculated; the side length of the lattice is positively correlated with the wavelength corresponding to the working frequency of the multi-layer dielectric lens; According to the filling rate of the dielectric lens material in the cubic lattice contained in each dielectric layer, the side length of the square bottom surface of the hollow cuboid in the cubic lattice contained in each dielectric layer is calculated, wherein the hollow cuboid runs through the entire cubic lattice from left to right; Based on the number of the multi-layer dielectric layers, the radius of each dielectric layer, the side length of the cube lattice, and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, the dielectric lens material is used to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain the multi-layer dielectric layer; Based on the radius of the reflection layer and the central angle of the reflection layer, the reflection layer is 3D printed using a pre-selected metal material, and the multi-layer dielectric layer and the reflection layer are assembled to obtain a multi-layer dielectric lens.

2. The method according to claim 1, characterized in that The multi-layer dielectric lens is a cylindrical multi-layer dielectric lens, the radius of each dielectric layer is the radius of the circle of each dielectric layer, and the design parameters further include: the height of the cylindrical multi-layer dielectric lens; The method of obtaining the multi-layer dielectric layer by 3D printing layer by layer from the innermost dielectric layer to the outermost dielectric layer using the dielectric lens material based on the number of dielectric layers, the radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer specifically includes: Based on the number of multi-layer dielectric layers, the radius of each dielectric layer, the side length of the cube lattice, the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, and the height of the cylindrical multi-layer dielectric lens, the dielectric lens material is used to 3D print layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain a cylindrical multi-layer dielectric layer; The method of 3D printing the reflective layer using a pre-selected metal material based on the radius of the reflective layer and the center angle of the reflective layer, and assembling the multi-layer dielectric layer and the reflective layer to obtain the multi-layer dielectric lens specifically includes: Based on the radius of the reflection layer, the central angle of the reflection layer and the height of the cylindrical multilayer dielectric lens, the reflection layer is 3D printed using a pre-selected metal material, and the cylindrical multilayer dielectric layer and the reflection layer are assembled to obtain a cylindrical multilayer dielectric lens.

3. The method according to claim 1, characterized in that The multi-layer dielectric lens is a Luneburg lens, and the radius of each dielectric layer is the radius of a sphere; The method of obtaining the multi-layer dielectric layer by 3D printing layer by layer from the innermost dielectric layer to the outermost dielectric layer using the dielectric lens material based on the number of dielectric layers, the radius of each dielectric layer, the side length of the cube lattice and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer specifically includes: Based on the number of multi-layer dielectric layers, the spherical radius of each dielectric layer, the side length of the cube lattice, and the side length of the square bottom surface of the hollow cuboid in the cube lattice contained in each dielectric layer, 3D printing is performed layer by layer from the innermost dielectric layer to the outermost dielectric layer to obtain two hemispherical multi-layer dielectric layers, and the two hemispherical multi-layer dielectric layers are pasted to obtain a spherical multi-layer dielectric layer; The step of assembling the multi-layer dielectric layer and the reflective layer to obtain the multi-layer dielectric lens specifically includes: The spherical multilayer dielectric layer and the reflective layer are assembled to obtain a Luneburg lens.

4. The method according to claim 2 or 3, characterized in that: The multi-layer dielectric lens comprises three dielectric layers, the radius of the first dielectric layer is 2.268 mm, and the dielectric constant of the first dielectric layer is 1.96; the radius of the second dielectric layer is 3.706 mm, and the dielectric constant of the second dielectric layer is 1.7956; the radius of the third dielectric layer is 5.292 mm, and the dielectric constant of the third dielectric layer is 1.4884.

5. The method according to claim 4, characterized in that The dielectric constant of the dielectric lens material is 2.45, the filling rate of the dielectric lens material in the cube lattice contained in the first dielectric layer is 74.4%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the first dielectric layer is 0.506 mm; the filling rate of the dielectric lens material in the cube lattice contained in the second dielectric layer is 64.3%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the second dielectric layer is 0.597 mm; the filling rate of the dielectric lens material in the cube lattice contained in the third dielectric layer is 43%, and the side length of the square bottom surface of the hollow rectangular parallelepiped in the cube lattice contained in the third dielectric layer is 0.755 mm.

6. The method according to claim 2, characterized in that The radius of the reflective layer of the cylindrical multilayer dielectric lens is 12.184 mm, and the central angle of the reflective layer is 180°.

7. The method according to claim 2, characterized in that The height of the cylindrical multilayer dielectric lens is 39 mm.

8. The method according to claim 3, characterized in that The radius of the reflective layer of the Luneburg lens is 6.092 mm, and the central angle of the reflective layer is 120°.

9. The method according to claim 1, characterized in that: The operating frequency of the multilayer dielectric lens is 77 GHz and the side length of the lattice is 1 mm.

10. A multilayer dielectric lens, characterized in that: The multilayer dielectric lens is prepared based on the method according to any one of claims 1 to 9.

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