CN113777778A - Luneberg lens and parameter calculation method, preparation method and preparation device thereof - Google Patents
Luneberg lens and parameter calculation method, preparation method and preparation device thereof Download PDFInfo
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Abstract
The application discloses a luneberg lens and a parameter calculation method, a preparation method and a preparation device thereof, wherein the parameter calculation method of the luneberg lens comprises the steps of obtaining the relative dielectric constant of an annular lens; determining the boundary value of each layer of annular lens according to the relative dielectric constant and a preset first formula; determining the thickness of each layer of the annular lens according to the boundary value of each layer of the annular lens; determining the heights of the central lens and the outer lens according to the boundary value of each layer of annular lens and a preset second formula; and determining parameters of the target central lens and the target outer lens according to the thickness and the height. According to the method, the boundary value is obtained through the relative dielectric constant, and the parameters of the target central lens and the outer target side central lens are obtained through the boundary value calculation, so that the calculation method is simple, the two-dimensional Luneberg lens can be expanded to be three-dimensional, and the ideal Luneberg lens is approached to the maximum; the luneberg lens prepared according to the parameters has low cost and higher performance, and can be used in a large scale.
Description
Technical Field
The application relates to the technical field of communication, in particular to a luneberg lens and a parameter calculation method, a preparation method and a preparation device thereof.
Background
In the related art, the luneberg lens has the advantages of low power consumption, light weight, good beam consistency and the like, and is widely concerned in the fields of high mobility, deep signal coverage, target detection, electromagnetic resistance and the like. Currently, the common method for producing the luneberg lens is multilayer spherical shell filling assembly or printing by using 3D printing technology.
However, these two production methods are expensive and inefficient, and it is difficult to achieve mass production.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the method for calculating the parameters of the luneberg lens can obtain the parameter information of the luneberg lens, simplify the steps of obtaining the parameters, and improve the production efficiency of the luneberg lens.
The method for calculating the parameters of the luneberg lens according to the embodiment of the first aspect of the present application is applied to a luneberg lens, wherein the luneberg lens includes a center lens and at least one outer lens, the outer lens is symmetric with respect to the center lens, the center lens includes at least two annular lenses, and the outer lens includes at least one annular lens, and includes: acquiring the relative dielectric constant of the annular lens; determining the boundary value of each layer of the annular lens according to the relative dielectric constant and a preset first formula; determining the thickness of each layer of the annular lens according to the boundary value of each layer of the annular lens; determining the heights of the central lens and the outer lens according to the boundary value of each layer of annular lens and a preset second formula; determining parameters of a target center lens and a target outer lens according to the thickness of each of the central lens and the outer lens and the heights of the central lens and the outer lens.
The method for calculating the parameters of the luneberg lens according to the embodiment of the application has at least the following beneficial effects: the boundary value is obtained through the relative dielectric constant, and the parameters of the target central lens and the outer central lens are obtained through the calculation of the boundary value, so that the calculation method is simple, the two-dimensional luneberg lens can be expanded to three dimensions, and the two-dimensional luneberg lens is close to an ideal luneberg lens to the maximum extent; the luneberg lens prepared according to the parameters has low cost and higher performance, and can be used in a large scale.
According to some embodiments of the present application, the determining the boundary value of each layer of the annular lens according to the relative permittivity and a preset first formula comprises: acquiring a boundary dielectric constant according to the relative dielectric constant and the preset first formula;
and obtaining the boundary value corresponding to each layer of the annular lens according to the boundary dielectric constant and the corresponding relation between the boundary dielectric constant and the boundary value.
According to some embodiments of the present application, the determining the thickness of each layer of the ring lens according to the boundary value of each layer of the ring lens comprises: if the annular lens is positioned in the central lens, determining the thickness of each layer of the annular lens according to the difference value of the boundary values of the outer layer annular lens and the inner layer annular lens; and if the annular lens is positioned on the outer lens, calculating and obtaining the thickness of each layer of the annular lens according to a central interpolation principle.
According to some embodiments of the application, the relative permittivity ranges from 1 to 2.
A method of making a luneberg lens according to an embodiment of the second aspect of the present application, comprising: preparing a target central lens and a target outer lens according to the thickness of each layer of annular lens in the central lens and the outer lens and the heights of the central lens and the outer lens; wherein the thickness and the height are obtained according to a parameter calculation method of the luneberg lens according to the embodiment of the first aspect of the present application; assembling the target center lens with the target outer lens to obtain a target lens.
The preparation method of the luneberg lens according to the embodiment of the application has at least the following beneficial effects: the parameter information of the target center lens and the target outer side lens is obtained through the parameter calculation method of the luneberg lens in the embodiment of the first aspect, the target center lens and the target outer side lens are obtained through a preparation method of a common lens, and the target lens is obtained after assembly, so that the manufacturing difficulty of the luneberg lens can be effectively reduced, and the production cost is reduced while the performance of the luneberg lens is ensured; meanwhile, the industrialized production of the luneberg lens can be realized.
A luneberg lens according to an embodiment of the third aspect of the present application, made according to a method of making a luneberg lens according to an embodiment of the second aspect of the present application described above, comprises: a central lens comprised of at least two layers of annular lenses; outer lenses, which are symmetrical with respect to the central lens, and are respectively disposed at both sides of the central lens; wherein the number of annular lens layers of the outer lens is smaller than the number of annular lens layers of the central lens.
The luneberg lens according to the embodiment of the present application has at least the following beneficial effects: the luneberg lens manufactured by the manufacturing method of the luneberg lens in the embodiment of the second aspect of the application has the focusing characteristics of consistent polarization directions and beam radiation directions, and ensures the high performance of the luneberg lens; in addition, the luneberg lens provided by the application is low in preparation cost, high in production efficiency and convenient to use in a large scale.
According to some embodiments of the application, the central lens is arranged coaxially with the outer lens.
According to some embodiments of the present application, the central lens is composed of three layers of annular lenses, the number of the outer lenses is two, and the central lens includes a first outer lens and a second outer lens, the first outer lens is composed of two layers of the annular lenses, the second outer lens is composed of one layer of the annular lenses, the first outer lenses are respectively disposed on two sides of the central lens, and the second outer lenses are respectively disposed on two sides of the first outer lens away from the central lens; the annular lens is made of materials with different relative dielectric constants, and the relative dielectric constants of the annular lens are sequentially reduced from inside to outside.
The apparatus for manufacturing a luneberg lens according to the embodiment of the fourth aspect of the present application is configured to perform the method for manufacturing a luneberg lens according to the embodiment of the second aspect of the present application.
The preparation device of the luneberg lens according to the embodiment of the application has at least the following beneficial effects: by implementing the method for manufacturing the luneberg lens according to the embodiment of the second aspect of the present application, the production flow of the luneberg lens can be simplified, thereby improving the production efficiency of the luneberg lens and realizing mass production.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The present application is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic flow chart illustrating a method for calculating parameters of a Luneberg lens according to an embodiment of the present disclosure;
FIG. 2 is a schematic flowchart of step S200 in FIG. 1;
FIG. 3 is a schematic flowchart of step S300 in FIG. 1;
FIG. 4 is a schematic flow chart of a method for making a Luneberg lens according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a Luneberg lens according to an embodiment of the present application;
FIG. 6 is a schematic view of another structure of a Luneberg lens according to an embodiment of the present application;
fig. 7A to 7C are schematic structural views of the center lens, the first outer lens and the second outer lens in fig. 6, respectively.
Reference numerals:
a center lens 100, an outer lens 200, a first outer lens 210, a second outer lens 220.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In a first aspect, the present application provides a method for calculating a parameter of a luneberg lens, applied to a luneberg lens, wherein the luneberg lens includes a central lens and at least one outer lens, the outer lens being symmetric with respect to the central lens, the central lens including at least two annular lenses, and the outer lens including at least one annular lens.
As shown in fig. 1, a method for calculating parameters of a luneberg lens according to an embodiment of the present application includes:
step S100: acquiring the relative dielectric constant of the annular lens;
step S200: determining the boundary value of each layer of annular lens according to the relative dielectric constant and a preset first formula;
step S300: determining the thickness of each layer of the annular lens according to the boundary value of each layer of the annular lens;
step S400: determining the heights of the central lens and the outer lens according to the boundary value of each layer of annular lens and a preset second formula;
step S500: and determining parameters of the target central lens and the target outer lens according to the thickness of each layer of annular lens in the central lens and the outer lens and the heights of the central lens and the outer lens.
According to the parameter calculation method of the luneberg lens, the boundary value is obtained through the relative dielectric constant, and the parameters of the target central lens and the outer target side central lens are obtained through the boundary value calculation, so that the calculation method is simple, the two-dimensional luneberg lens can be expanded to be three-dimensional, and the two-dimensional luneberg lens is close to an ideal luneberg lens to the maximum extent; the luneberg lens prepared according to the parameters has low cost and higher performance, and can be used in a large scale.
For example, the luneberg lens is composed of a central lens composed of at least two layers of annular lenses and at least one outer lens composed of at least one layer of annular lenses. Each layer of annular lens is made of materials with different relative dielectric constants, and the dielectric constant of the annular lens is gradually reduced from the inner layer to the outer layer. And acquiring the relative dielectric constant of each layer of annular lens, and acquiring the boundary value of each layer of annular lens according to a preset first formula. The thickness of each layer of annular lens is determined through the boundary value of each layer of annular lens, and the height of the central lens and the height of the outer lens can be calculated through the boundary value and a preset second formula. Therefore, the height parameter of the target central lens, the thickness parameter of each layer of annular lens in the target central lens, the height parameter of the target outer side lens and the thickness parameter of each layer of annular lens in the target outer side lens can be obtained, the calculation method of the target lens is simplified through the method, and the parameter information of the target lens can be quickly obtained.
In some embodiments of the present application, as shown in fig. 2, step S200: determining boundary values of the annular lenses of the layers according to the relative dielectric constant and a preset first formula includes but is not limited to the following steps:
step S210: acquiring a boundary dielectric constant according to the relative dielectric constant and a preset first formula;
step S220: and obtaining the boundary value corresponding to each layer of annular lens according to the boundary dielectric constant and the corresponding relation between the boundary dielectric constant and the boundary value.
For example, each layer of annular lens is made of materials with different relative dielectric constants, the relative dielectric constant range is 1-2, after the relative dielectric constant of each layer of annular lens is obtained, the boundary dielectric constant is obtained according to a preset first formula, and the preset first formula is as follows:
wherein ,
is the boundary dielectric constant,. epsilonriIs the relative dielectric constant, r, of the ith layer of annular lensiIs the boundary of the i-th layer annular lens, R0Which is the radius of a luneberg sphere, the layer 1 annular lens is the innermost annular lens of the central lens.
After the boundary dielectric constant is obtained, the boundary value corresponding to each layer of annular lens can be obtained according to the corresponding relation between the boundary dielectric constant and the boundary value, wherein the corresponding relation between the boundary dielectric constant and the boundary value is 2.0- (R/R) by the luneberg lens mathematical model epsilon (R)0)2Thus obtaining the product.
In some embodiments of the present application, as shown in fig. 3, step S300: determining the thickness of each layer of the annular lens according to the boundary value of each layer of the annular lens includes but is not limited to the following steps:
step S310: if the annular lens is positioned in the central lens, determining the thickness of each layer of the annular lens according to the difference value of the boundary values of the outer layer annular lens and the inner layer annular lens;
step S320: if the annular lens is positioned on the outer side lens, the thickness of each layer of the annular lens is calculated and obtained according to the central interpolation principle.
For example, if the annular lens whose thickness needs to be calculated is located on the central lens, each layer thickness of the annular lens is equal to the boundary value of the outer layer annular thickness-the boundary value of the inner layer annular lens, and the thickness of the innermost layer annular lens is equal to the boundary value of the innermost layer annular lens; if the annular lens for which the thickness needs to be calculated is located on the outer lens, the thickness of each layer of the annular lens is calculated by using the principle of central interpolation.
In some embodiments of the present application, the relative permittivity ranges from 1 to 2. In order to produce a high performance luneberg lens, the relative permittivity of each layer of the annular lens should be between 1 and 2, and the relative permittivity of the annular lens decreases from the inner layer to the outer layer. The material for preparing the annular lens can be obtained from common microporous foam materials, and the relative dielectric constant of each layer of the annular lens is set according to requirements.
In a second aspect, as shown in fig. 4, an embodiment of the present application further provides a method for manufacturing a luneberg lens, including:
step S600: preparing a target central lens and a target outer lens according to the thickness of each layer of annular lens in the central lens and the outer lens and the height of the central lens and the height of the outer lens;
step S700: the target center lens is assembled with the target outer lens to obtain the target lens.
Wherein the thickness and the height are obtained according to a parameter calculation method for a luneberg lens according to an embodiment of the above first aspect of the present application.
For example, the parameter information of the target central lens and the target outer lens is obtained by the parameter calculation method of the luneberg lens according to the embodiment of the first aspect of the present application, and the parameter information includes the heights of the target central lens and the target outer lens and the thickness of each layer of the annular lens. The target central lens and the target outer side lens are manufactured by utilizing a conventional cylindrical lens manufacturing method, and the conventional cylindrical lens manufacturing method comprises a film-covering injection molding online foaming-nesting process, flexible coil winding and the like. The target central lens and the target outer side lens are assembled to obtain the target lens, the target central lens and the target outer side lens support can be fixed through optical cement, the target outer side lenses are respectively arranged on two sides of the target central lens, and the target outer side lenses are symmetrical relative to the target central lens.
According to the method for preparing the luneberg lens, parameter information of the target center lens and the target outer side lens is obtained through the parameter calculation method of the luneberg lens in the embodiment of the first aspect, the target center lens and the target outer side lens are obtained through the preparation method of the common lens, and the target lens is obtained after assembly, so that the manufacturing difficulty of the luneberg lens can be effectively reduced, the performance of the luneberg lens is ensured, and meanwhile, the production cost is reduced; meanwhile, the industrialized production of the luneberg lens can be realized.
In a third aspect, the present application also provides a luneberg lens made according to the method of making a luneberg lens of the embodiment of the second aspect of the present application described above. As shown in fig. 5, the luneberg lens includes a center lens 100 and an outer lens 200, the center lens 100 being composed of at least two layers of annular lenses; the outer lenses 200 are symmetrical with respect to the central lens 100 and are respectively disposed at both sides of the central lens 100; the number of annular lens layers of the outer lens 200 is smaller than that of the central lens 100. The number of outer lenses 200 may be set as desired, but is less than the number of layers of the ring lens in the center lens 100.
According to the luneberg lens provided by the embodiment of the application, the luneberg lens manufactured by the manufacturing method of the luneberg lens provided by the embodiment of the second aspect of the application has the focusing characteristics that all polarization directions and all beam radiation directions are consistent, and the high performance of the luneberg lens is ensured; in addition, the luneberg lens provided by the application is low in preparation cost, high in production efficiency and convenient to use in a large scale.
In some embodiments of the present application, the center lens 100 is disposed coaxially with the outer lens 200.
In some embodiments of the present application, as shown in fig. 6 to 7C, the central lens 100 is composed of three layers of annular lenses, the number of the outer lenses 200 is two, and the two layers of the outer lenses include a first outer lens 210 and a second outer lens 220, the first outer lens 210 is composed of two layers of annular lenses, the second outer lens 220 is composed of one layer of annular lenses, the first outer lens 210 is respectively disposed on two sides of the central lens 100, and the second outer lens 220 is respectively disposed on two sides of the first outer lens 210 away from the central lens 100; the annular lens is made of materials with different relative dielectric constants, and the relative dielectric constants of the annular lens are sequentially reduced from inside to outside.
For example, the central lens 100 has three annular lenses, and the relative dielectric constant decreases from inside to outside; the number of the outer lenses 200 is two, and is a first outer lens 210 and a second outer lens 220, wherein the first outer lens 210 is composed of two layers of annular lenses, and the second outer lens 220 is composed of one layer of annular lenses.
The first outer lenses 210 are respectively disposed on two sides of the central lens 100, the second outer lenses 220 are respectively disposed on one sides of the first outer lenses 210 away from the central lens 100, and the first outer lenses 210 and the second outer lenses 220 are symmetrical with respect to the central lens 100.
In a fourth aspect, the present application further provides a manufacturing apparatus for a luneberg lens, for performing the manufacturing method of the luneberg lens according to the embodiment of the second aspect of the present application.
According to the method for manufacturing the luneberg lens of the embodiment of the present application, by executing the method for manufacturing the luneberg lens of the embodiment of the second aspect of the present application, the production flow of the luneberg lens can be simplified, thereby improving the production efficiency of the luneberg lens and realizing mass production.
The method for calculating parameters of a luneberg lens according to an embodiment of the present application is described in detail below with reference to fig. 1 to 7C in a specific embodiment, and it is to be understood that the following description is only exemplary and not a specific limitation of the present application.
As shown in fig. 1 to 7C, the luneberg lens to be prepared is composed of one central lens 100 and two outer lenses 200, the outer lenses 200 including a first outer lens 210 and a second outer lens 220, the central lens 100 having three layers of annular lenses, the first outer lens 210 being composed of two layers of annular lenses, and the second outer lens 220 being composed of one layer of annular lenses, wherein the annular lenses have relative dielectric constants decreasing from the inner layer to the outer layer. The annular lens is made of materials with different relative dielectric constants, such as foamed PVC, foamed polystyrene, foamed silicon rubber and the like.
For example, the relative dielectric constants are selected to be respectively ε1＝1.85、ε2＝1.60、ε3Three layers of annular lens of central lens 100 were prepared from 1.30 material; accordingly, the relative dielectric constants of the two annular lenses in the first outer lens 210 are respectively ε2＝1.60、ε31.30; the ring lens in the second outer lens 220 has a relative dielectric constant of ε3＝1.30。
Obtaining a boundary dielectric constant according to the relative dielectric constant and a preset first formula, and obtaining a boundary value (where the boundary value is a normalized boundary value) corresponding to each layer of annular lens according to the corresponding relationship between the boundary dielectric constant and the boundary value, namely r1/R0＝0.5481、r2/R0＝0.7074、r3/R0＝0.9486。
The thickness value of each layer of the annular lens is determined from the boundary value of each layer of the annular lens, and when the annular lens is located in the central lens 100, the thickness value of each layer of the annular lens is defined as the boundary value of the outer layer annular thickness — the boundary value of the inner layer annular lens, that is, the first layer thickness is 0.5481, the second layer thickness is 0.1593, and the third layer thickness is 0.2412. When the ring lens is located at outer lens 200, the thickness of each layer of the ring lens is calculated by using the principle of central interpolation, i.e. the thickness of the first layer of first outer lens 210 is calculated by the formula
0.3239, namely; the calculation formula of the thickness of the second layer of the first outer lens 210 is
0.7105, namely; the thickness of the second outer lens 220 is calculated as
Namely 0.4635.
Determining the central lens 10 according to the boundary value of each layer of annular lens and a preset second formula0 and the height of the outer lens 200, the height of the center lens 100 being 2r1/R01.0962, namely; the first outer lens 210 has a height r2/R0-r1/R00.1593, namely; the first outer lens 210 has a height r3/R0-r2/R0I.e., 0.2412.
According to the parameter calculation method of the luneberg lens in the embodiment of the application, at least some effects can be achieved, parameters of the target central lens 100 and the target outer side central lens 100 can be obtained through the calculation method, and the calculation method is simple; moreover, the luneberg lens can be prepared by the conventional cylindrical lens manufacturing method according to the parameters, so that the production flow of the luneberg lens is simplified, and the production cost is reduced.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (9)
1. A method for calculating parameters of a Luneberg lens, applied to a Luneberg lens, wherein the Luneberg lens includes a center lens and at least one outer lens, the outer lens being symmetrical with respect to the center lens, the center lens including at least two annular lenses, and the outer lens including at least one annular lens, the method comprising:
acquiring the relative dielectric constant of the annular lens;
determining the boundary value of each layer of the annular lens according to the relative dielectric constant and a preset first formula;
determining the thickness of each layer of the annular lens according to the boundary value of each layer of the annular lens;
determining the heights of the central lens and the outer lens according to the boundary value of each layer of annular lens and a preset second formula;
determining parameters of a target center lens and a target outer lens according to the thickness of each of the central lens and the outer lens and the heights of the central lens and the outer lens.
2. The method of calculating parameters of a luneberg lens according to claim 1, wherein said determining boundary values of said annular lenses for respective layers based on said relative dielectric constant and a predetermined first formula comprises:
acquiring a boundary dielectric constant according to the relative dielectric constant and the preset first formula;
and obtaining the boundary value corresponding to each layer of the annular lens according to the boundary dielectric constant and the corresponding relation between the boundary dielectric constant and the boundary value.
3. The method of calculating parameters of a luneberg lens according to claim 1, wherein said determining the thickness of each layer of said annular lens based on boundary values of said respective layers of said annular lens comprises:
if the annular lens is positioned in the central lens, determining the thickness of each layer of the annular lens according to the difference value of the boundary values of the outer layer annular lens and the inner layer annular lens;
and if the annular lens is positioned on the outer lens, calculating and obtaining the thickness of each layer of the annular lens according to a central interpolation principle.
4. The method of calculating parameters of a luneberg lens according to claim 1, wherein the relative permittivity ranges from 1 to 2.
5. The preparation method of the luneberg lens is characterized by comprising the following steps:
preparing a target central lens and a target outer lens according to the thickness of each layer of annular lens in the central lens and the outer lens and the heights of the central lens and the outer lens; wherein the thickness and the height are obtained by the parameter calculation method of the luneberg lens according to any one of claims 1 to 4;
assembling the target center lens with the target outer lens to obtain a target lens.
6. A Luneberg lens produced by the method of claim 5, comprising:
a central lens comprised of at least two layers of annular lenses;
outer lenses, which are symmetrical with respect to the central lens, and are respectively disposed at both sides of the central lens; wherein the number of annular lens layers of the outer lens is smaller than the number of annular lens layers of the central lens.
7. A Luneberg lens as claimed in claim 6, wherein the central lens is disposed coaxially with the outer lens.
8. The luneberg lens of claim 6 wherein the central lens is comprised of three annular lenses, the outer lenses being two in number and comprising a first outer lens comprised of two annular lenses and a second outer lens comprised of one annular lens, the first outer lens being disposed on each side of the central lens and the second outer lens being disposed on each side of the first outer lens away from the central lens;
the annular lens is made of materials with different relative dielectric constants, and the relative dielectric constants of the annular lens are sequentially reduced from inside to outside.
9. A manufacturing apparatus of a Luneberg lens, characterized by being used for carrying out the manufacturing method of a Luneberg lens according to claim 5.
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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