CN114188724A - Metal lens and dual-polarized metal lens antenna - Google Patents
Metal lens and dual-polarized metal lens antenna Download PDFInfo
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- CN114188724A CN114188724A CN202111302320.9A CN202111302320A CN114188724A CN 114188724 A CN114188724 A CN 114188724A CN 202111302320 A CN202111302320 A CN 202111302320A CN 114188724 A CN114188724 A CN 114188724A
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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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
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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
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- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention provides a metal lens and a dual-polarized metal lens antenna, wherein the metal lens comprises a plurality of square open waveguide units which are different in length and made of all metal, the square open waveguide units are arranged in parallel and combined to form a grid-shaped array structure, so that spherical waves emitted by a feed source at the focus of the metal lens are converted into plane waves after passing through the metal lens. Compared with the existing metal lens antenna, the metal lens antenna provided by the invention adopts the metal lens with a novel structural design, and the focal length is not limited by the minimum value, so that the antenna can theoretically support any focal length ratio, and can be better suitable for application scenes requiring that the distance between the feed source and the lens is short. In addition, the metal lens based on the Fresnel structure, which is further optimally designed, can effectively solve the problem that the thickness of the metal lens is sharply increased along with the increase of the aperture of the metal lens, so that the metal lens antenna disclosed by the invention is more beneficial to practical application.
Description
Technical Field
The invention relates to an antenna technology in a wireless communication system, in particular to a metal lens and a dual-polarized metal lens antenna.
Background
The antenna is an important component which is not available in systems such as a wireless communication system, a radar system and the like, and the performance of the antenna determines the performance and the quality of the whole wireless system. With the overall advance of wireless communication technologies represented by 5G and the internet of things, development of high-quality antenna assemblies suitable for application scenarios is urgently needed. The lens antenna is an important branch of an antenna and is widely used in mobile communication, millimeter wave communication, satellite communication and the like.
The high-gain lens antenna commonly used at present can be roughly divided into a dielectric lens (deceleration lens), a metal lens (acceleration lens), an array lens (transmission array lens and reflection array lens) and a super lens (super surface lens and metamaterial lens). The dielectric lens and the metal lens can be regarded as optical lenses, and spherical waves emitted by the feed source are converted into plane waves by changing the shape of the lenses to realize high gain. The dielectric constant of the dielectric lens is generally larger than 1, so the dielectric lens is generally a convex lens, and the equivalent refractive index of the metal lens is generally smaller than 1, so the metal lens is generally a concave lens. The principle of the projection array is to realize the functions of high gain, beam forming and the like by changing the phase of electromagnetic waves of a feed source incident to an array element, and the projection array is generally divided into a transmission array and a reflection array according to structural classification.
In terms of the commonly used dielectric lens at present, the manufacturing material is a dielectric, the dielectric loss of the dielectric lens per se exists, particularly in a high-frequency millimeter wave frequency band, the dielectric loss can be rapidly increased, and the cost of the material with low dielectric loss in the millimeter wave band is higher. In addition, dielectric lenses are difficult to use in high power applications. The main defects of the array lens are the same as those of the dielectric lens, most of the array lenses need a substrate, so that the dielectric loss is increased and the power capacity is smaller, although the array lens with an all-metal structure is provided, most of the array lenses have narrow bandwidth or very fine structure, the processing is very complex, and the processing in a millimeter wave band is difficult to realize. The characteristics of the super lens realized by the unit are mostly realized by a resonance structure, so that the whole bandwidth is very narrow, and the power capacity is smaller. In contrast, the metal lens has the main advantages of simple structure, wide gain bandwidth, high power capacity and no dielectric loss.
The metal lens antenna adopted at present is generally formed by parallelly placing a plurality of metal plates with different lengths. The metal plates are perpendicular to the ground, and the metal plates closer to the middle are shorter. The electric wave is accelerated while propagating in the parallel metal plates. Spherical waves from a radiation source (feed) travel a longer path for acceleration as they pass through the metal lens, closer to the edge of the lens, and shorter in the middle. Therefore, the spherical wave passing through the metal lens becomes a plane wave. However, the curved surface of the existing metal lens is generally an ellipsoid, and in order to achieve the purpose of converting spherical waves into plane waves, the focal length f of the existing metal lens has a minimum value, that is, the focal length ratio f/D (D is the aperture of the metal lens) has a minimum value, so that the existing metal lens is difficult to be applied to some demand scenes requiring that the feed source is closer to the lens. Therefore, with the current trend of demand for miniaturization of antennas, there is a need for improvement of existing metal lens antennas.
Disclosure of Invention
The present invention is directed to at least partially solve the above problems of the prior art, and to provide a dual-polarized metal lens and a lens antenna.
One of the objects of the invention is achieved by: a metal lens comprises a plurality of square opening waveguide units which are different in length and made of all metal, wherein the square opening waveguide units are arranged in parallel and combined to form a grid-shaped array structure, so that spherical waves emitted from the focal point of the metal lens are changed into plane waves after passing through the metal lens.
Preferably, one end of each square open waveguide unit is flush to form a planar array surface, and the other end is arranged to form a non-planar array.
Preferably, one end of each square open waveguide unit is flush to form a planar array surface, and the other end of each square open waveguide unit is arranged to form a curved surface, the curved surface is equivalently formed by a curve rotating along an x axis, and the curve satisfies the following conditions:
wherein x and y are coordinate values of points on the metal lens curve under a plane rectangular coordinate system, the plane rectangular coordinate system takes the midpoint of the metal lens curve as the origin of coordinates, the tangent line at the midpoint of the curve as the y axis, the x axis is perpendicular to the lens caliber surface, and the x axis is perpendicular to the lens caliber surface0Is the x-coordinate value, f, of the plane side of the metal lens2Is the focal length of the metal lens, v is the phase velocity of the main mode propagating in the square waveguide, v0Is the wave velocity in free space.
Preferably, the square open waveguide unit is configured as a square waveguide.
Preferably, the square waveguide tube has a side length of 7mm and a tube wall thickness of 1 mm.
Preferably, one end of each square open waveguide unit is flush to form a planar array surface, and the other end is arranged to form a non-planar array surface with a symmetrical structure, so as to form the fresnel structure.
Another objective of the present invention is to provide a dual-polarized metal lens antenna, which includes a feed antenna and the above-mentioned metal lens, wherein the feed antenna faces the planar array surface of the metal lens, and the feed center is located at the focal point of the metal lens.
Preferably, the feed antenna further comprises a coaxial waveguide adapter and an orthogonal mode coupler which are connected, and the orthogonal mode coupler is connected with the feed antenna.
The invention has the beneficial effects that:
compared with the existing metal lens antenna, the metal lens antenna provided by the invention adopts the metal lens with a novel structural design, and the focal length is not limited by the minimum value, so that the antenna can theoretically support any focal diameter ratio, and can be better suitable for application scenes requiring that the distance between the feed source and the lens is short. In addition, the metal lens based on the Fresnel structure, which is further optimally designed, can effectively solve the problem that the thickness of the metal lens is sharply increased along with the increase of the aperture of the metal lens, so that the metal lens antenna disclosed by the invention is more beneficial to practical application.
Description of the drawings:
fig. 1 is a schematic view of an opening structure of a square opening waveguide unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metal lens according to an embodiment of the invention;
FIG. 3 is a schematic comparison of a metal lens according to an embodiment of the present invention and a conventional metal lens;
FIG. 4 is a schematic structural diagram of a metal lens according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dual-polarized metal lens antenna according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a result of testing peak gain and axial ratio during dual circular polarization radiation of the dual polarized metal lens antenna according to the embodiment of the invention;
fig. 7 is a diagram illustrating a dual linear polarization peak gain test result of the dual polarized metal lens antenna according to the embodiment of the invention;
FIG. 8 is a linear polarization radiation pattern of a dual polarized metal lens antenna according to an embodiment of the present invention;
fig. 9 is a circularly polarized radiation pattern of the dual-polarized metal lens antenna according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, embodiments of the present invention are shown as follows:
referring to fig. 1 to 4, a metal lens is provided, which includes a plurality of square open waveguide units 1 made of all metal and having different lengths, the square open waveguide units are arranged in parallel and combined to form a grid-shaped array structure, so that a spherical wave emitted from a focal point of the metal lens is converted into a plane wave after passing through the metal lens.
It can be understood that, in the present embodiment, the square open waveguide unit refers to a waveguide structure unit having two open ends and enclosing a square waveguide cavity by surrounding metal walls, and the length of the square open waveguide unit can be understood as the length of the square waveguide cavity; the square open waveguide units are parallel to each other and combined to form a grid-shaped array structure, namely each square open waveguide unit forms an independent unit grid, each square open waveguide unit serves as an array unit, and the sizes of square openings are the same. It should be further noted that, compared with the existing metal lens formed by parallel metal plates, in the embodiment, a grid-shaped array distribution structure is formed by a plurality of independent square opening waveguide units, which is beneficial to obtaining a more regular beam shape and improving radiation directivity. In addition, in terms of a manufacturing process of a metal lens, a plurality of metal plates with different lengths are generally required to be manufactured respectively for an existing metal lens, two opposite ends of each metal plate are required to be processed into specific curved shapes, and then the manufactured metal plates are assembled on a lens mounting main body (made of a non-metal material) according to a specific position sequence, so that the manufacturing process is multiple, the structural assembly is complex, and the implementation cost is relatively high. The metal lens of the embodiment is made of all metal materials, so that the whole metal lens can be manufactured through 3D printing, and manufacturing cost is reduced.
Furthermore, the metal lens of this embodiment is used to convert the spherical wave emitted from the focal point of the metal lens into a plane wave after passing through the metal lens, that is, the spherical wave enters from one side of the metal lens and is converted into a plane wave after being accelerated by the square open waveguide units with different length combinations. Therefore, the skilled person can choose to arrange the metal lens as a whole as a biconcave lens structure, based on the purpose to be achieved by the metal lens. However, based on the construction method different from the existing metal lens proposed by the present invention, as a suggested preferable scheme, one end of each square open waveguide unit is flush to form a planar wavefront, and the other end is arranged to form a non-planar wavefront, which is beneficial to simplifying the structure of the metal lens.
In some embodiments, referring to fig. 1, the square open waveguide unit is configured as a square waveguide, and the main modes propagating in the square open waveguide are a TE10 mode and a TE01 mode according to the common knowledge in the art, and when the square waveguide is used, the cutoff frequency of TE01 and TE10 is not much different, and two modes can be formed to be transmitted together, which respectively correspond to two orthogonal polarizations. Still further, the size of the opening of the square waveguide tube can be configured according to actual requirements, for example, the side length a of the square waveguide tube is configured to be 7-8mm, and the wall thickness of the tube is 1-2 mm.
Referring to fig. 2, in some embodiments, one end of each square open waveguide unit 111 of the metal lens 11 is flush to form a planar wavefront, and the other end is arranged to form a curved surface, and further, fig. 3 (b) is a schematic cross-sectional view (x-y plane) of the metal lens 11 of this embodiment, where the curved surface may be equivalently formed by rotating a curve 360 ° along the x axis, and the curve satisfies:
wherein x and y are coordinate values of points on the metal lens curve under a plane rectangular coordinate system, the plane rectangular coordinate system takes the midpoint of the metal lens curve as the origin of coordinates, the tangent line at the midpoint of the curve as the y axis, the x axis is perpendicular to the lens caliber surface, and the x axis is perpendicular to the lens caliber surface0Is the x-coordinate value, f, of the plane side of the metal lens2Is the focal length of the metal lens, v is the phase velocity of the main mode propagating in the square waveguide, v0Is the wave velocity in free space.
It should be noted that the curved surface of the existing metal lens is usually an ellipsoid, the feed source faces the ellipsoid, the curved surface of the metal lens adopted in this embodiment is an aspheric surface, and is a curved surface formed by rotating based on a special design curve, and based on the design, the feed source can be arranged facing a plane. For convenience of explanation, the conventional metal lens and the metal lens of the embodiment are specifically analyzed below by combining the cross section (x-y plane) of the metal lens with the illustration in fig. 3, wherein (a) is a schematic cross-sectional view of the conventional metal lens.
According to the basic theory of electromagnetic wave propagation in the waveguide, the main modes of propagation in the square waveguide are the TE10 mode and the TE01 mode, which correspond to two orthogonal polarizations, respectively, and their phase velocities are:
where a is the square waveguide side length and λ is the free space wavelength, the equivalent refractive index is
n＝v0/v(n＜1) (2)
In order to achieve high gain effect, spherical wave needs to be converted into plane wave, and the curve of the existing metal lens needs to satisfy the following formula:
assuming that the aperture radius of the lens is R, when y ═ R, equation (3) can be transformed into:
(1-n2)x2-2(1-n)f1x+R2＝0 (4)
in order for equation (4) to have a solution, the following condition needs to be satisfied:
Δ＝4(1-n)2f1 2-4(1-n2)≥0
as can be seen from equation (5), the focal length f of the existing metal lens1There is a minimum, i.e. the ratio f/D of the focal length to the caliber diameter (D2R) is a minimum.
Similarly, in order to realize a high gain effect and convert spherical waves into plane waves, the curve of the metal lens provided by the embodiment of the invention is set to meet the following conditions:
assuming that the aperture radius of the lens is R, when y ═ R, equation (6) can be transformed into:
-(1-n)2x2-2(1-n)(f2-x0)x+R2＝0 (7)
in order for equation (7) to have a solution, the following condition needs to be satisfied:
Δ＝4(1-n)2(f2-x0)2+4(1-n)2R2≥0 (8)
as can be seen from equation (8), the equation has a solution when the focal length of the metal lens proposed in the embodiment of the present invention is an arbitrary value. That is, theoretically, the ratio of focal diameters of the metal lenses of the embodiments of the present invention can be designed to be an arbitrary value.
In summary, the focal length f of the conventional metal lens is analyzed1Having a theoretical minimum value, which corresponds to the minimum value of the ratio of focal diameters of the conventional metal lenses, so that the focal length cannot be reduced any more after reaching the theoretical minimum value when the aperture of the lens is determined, is determined by the feeding position of the conventional metal lens and the shape of the curved surface of the lens. The novel metal lens provided by the embodiment of the invention can realize any focal length or focal length ratio theoretically, and has obvious advantages in certain applications requiring that the distance between the feed source and the lens is relatively short.
In some embodiments, the square open waveguide units have one end flush with a planar wavefront and the other end arranged to form a non-planar wavefront with a symmetrical configuration to form a fresnel structure. It is understood that, theoretically, if the aperture of the lens is increased, the thickness of the lens itself will be increased sharply, which is not favorable for realizing miniaturization in practical application. The metal lens of this embodiment has a fresnel lens structure formed by the fresnel principle, and the thickness T of the metal lens can be maintained at a certain value1Is determined by the following equation:
T1＝λ(1-n) (9)。
as a metal lens designed in an embodiment, the metal lens is a discrete fresnel metal lens, and the discrete fresnel lens is formed by a discrete lens according to the fresnel principle, it can be understood that the discrete type in this embodiment means that the lengths of the square open waveguide units constituting the metal lens from the center to the periphery are in discrete distribution, and in contrast, the metal lens provided in the above embodiment of the present application, in which one end is arranged to form a curved surface, is continuous, and the unit length of the curved end is continuously increased from the middle to the periphery, while the discrete type in this embodiment is discrete length of the square open waveguide unit. Referring to fig. 4, unlike the length distribution of the square open waveguide unit of the metal lens 11 according to the above embodiment of the present invention, the length (corresponding to the height shown in the drawing) of the square open waveguide unit 121 of the metal lens 12 according to the present embodiment does not increase from the center of the lens to the edge, but has a sudden change, that is, the length periodically increases to a certain value (for example, the thickness value determined by the above formula 9), then changes to the minimum value and then increases. Furthermore, considering the length discontinuity of the square open waveguide unit constituting the discrete metal lens, this method can reduce the processing difficulty but introduce a certain phase error, and therefore, the lengths of the square open waveguide units at different positions of the metal lens can be properly optimized and adjusted. Specifically, fig. 4 (a) is a schematic diagram of the metal lens 12 of the discrete fresnel lens structure, and (b) is a schematic diagram of the length distribution of each square open waveguide unit 121 in the diagram (a), and the numerical unit is mm. In practical tests, it is found that the metal lens corresponding to the structure shown in fig. 2 is not much different from the metal lens of the structure shown in fig. 4 in basic performance, but the efficiency of the metal lens 12 of the present embodiment is slightly reduced because the fresnel lens structure introduces a larger shielding effect; meanwhile, the thickness of the metal lens 12 of the embodiment can be kept consistent when the aperture of the lens is increased, and the thickness is relatively reduced, so that the weight of the metal lens 12 is reduced, and the material consumption is saved.
Another objective of the present invention is to provide a dual-polarized metal lens antenna, as shown in fig. 5, the dual-polarized metal lens antenna includes a feed antenna 2 and the above-mentioned metal lens 12 (a metal lens 11 may also be used), the feed antenna faces the planar array surface of the metal lens 12, and the feed center is located at the focal point of the metal lens. Further preferably, the feed antenna also comprises a coaxial waveguide adapter 4 and an orthogonal mode coupler 3 which are connected, and the orthogonal mode coupler 3 is connected with the feed antenna 2. The feed antenna can be selected from a horn antenna, and of course, other feed antennas can also be used. It can be understood that the dual-polarized metal lens antenna provided by this embodiment adopts the metal lens described in the above embodiments, the feed antenna faces the planar array surface of the metal lens, and the feed center is located at the focal point of the metal lens, and the metal lens antenna can theoretically realize any focal length or focal diameter ratio, and can be better applied to some application scenarios requiring the feed to be closer to the lens, and meanwhile, is more favorable for realizing a miniaturized structural design.
In order to verify the performance effect of the metal lens antenna provided by the invention, a test is performed on the dual-polarized metal lens antenna of one embodiment, the metal lens antenna adopts a metal lens corresponding to the structure shown in fig. 2, an aluminum square open waveguide unit is adopted, the side length a of the square is configured to be 7.112mm, and the wall thickness of the tube is 1 mm. Fig. 6 is a diagram showing a test result of peak gain and axial ratio when the dual-polarized metal lens antenna is dual circularly polarized radiation, fig. 7 is a diagram showing a test result of peak gain when the dual-polarized metal lens antenna is dual linearly polarized, fig. 8 is a linear polarization radiation pattern of the dual-polarized metal lens antenna, and fig. 9 is a circularly polarized radiation pattern of the dual-polarized metal lens antenna. It is to be understood that in the above drawings, Gain represents Gain, AR represents axial ratio, mea represents simulation, sim represents measurement, LHCP represents left-hand circular polarization, RHCP represents right-hand circular polarization, feed horn represents horn antenna, LP represents linear polarization, VP represents vertical polarization, and HP represents horizontal polarization.
From the tests, the design structure of the metal lens antenna can conveniently realize dual-linear polarization radiation, the feed source supports dual circular polarization radiation when being a circular polarization antenna, and the peak gain, gain bandwidth and aperture efficiency of the metal lens antenna are high.
In some other comparative tests, the metal lens antenna of the embodiment of the invention has the advantage of better performance than the existing metal lens antenna when the focal diameter is smaller. When the focal length ratio is 1, the peak gain, the gain bandwidth and the aperture efficiency of the metal lens antenna of the embodiment of the invention are equivalent to the performances of the existing metal lens antenna. When the focal length to diameter ratio is 0.8 or 0.5, the peak gain, gain bandwidth and aperture efficiency of the metal lens antenna of the embodiment of the invention are obviously higher than those of the existing metal lens antenna.
In the description of the embodiments of the invention, the particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the embodiments of the present invention, it should be understood that "-" and "-" indicate the same range of two numerical values, and the range includes the endpoints. For example, "A-B" means a range greater than or equal to A and less than or equal to B. "A to B" means a range of not less than A and not more than B.
In the description of the embodiments of the present invention, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A metal lens is characterized by comprising a plurality of square opening waveguide units which are different in length and made of all metal, wherein the square opening waveguide units are arranged in parallel and combined to form a grid-shaped array structure, so that spherical waves emitted by a feed source at the focus of the metal lens are changed into plane waves after passing through the metal lens.
2. The metal lens of claim 1, wherein one end of each square open waveguide unit is flush with a planar wavefront and the other end is arranged to form a non-planar array.
3. The metal lens as claimed in claim 2, wherein one end of each square open waveguide unit is flush to form a planar wavefront, and the other end is arranged to form a curved surface, the curved surface is equivalently formed by a curve rotating along an x-axis, and the curve satisfies:
wherein x and y are coordinate values of points on the metal lens curve under a planar rectangular coordinate system, the planar rectangular coordinate system uses the midpoint of the metal lens curve as the origin of coordinates, uses the tangent line at the midpoint as the y axis, the x axis is perpendicular to the aperture surface of the metal lens, and the x axis is perpendicular to the aperture surface of the metal lens0Is the x-coordinate value, f, of the plane side of the metal lens2Is the focal length of the metal lens, v is the phase velocity of the main mode propagating in the square waveguide, v0Is the wave velocity in free space.
4. The metal lens according to any of claims 1 to 3, wherein the square open waveguide unit is configured as a square waveguide.
5. The metal lens as claimed in claim 4, wherein the square of the square waveguide has a side of 7mm and a wall thickness of 1 mm.
6. The metal lens as claimed in claim 2, wherein one end of each square open waveguide unit is flush to form a planar wavefront, and the other end is arranged to form a non-planar array of symmetrical structures to form a fresnel lens structure.
7. A dual polarized metal lens antenna comprising a feed antenna and a metal lens of any of claims 1-6, the feed antenna facing the planar array of the metal lens and the feed center being located at the focal point of the metal lens.
8. The dual polarized metal lens antenna of claim 7, further comprising a coaxial waveguide adapter and an orthogonal mode coupler connected, the orthogonal mode coupler connecting the feed antenna.
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| CN202111302320.9A CN114188724A (en) | 2021-11-04 | 2021-11-04 | Metal lens and dual-polarized metal lens antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115441206A (en) * | 2022-09-28 | 2022-12-06 | 珠海中科慧智科技有限公司 | Lens antenna |
| DE102022212737A1 (en) | 2022-11-28 | 2024-05-29 | Vega Grieshaber Kg | LEVEL MEASURING DEVICE, SYSTEM AND USE OF METAMATERIAL |
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2021
- 2021-11-04 CN CN202111302320.9A patent/CN114188724A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115441206A (en) * | 2022-09-28 | 2022-12-06 | 珠海中科慧智科技有限公司 | Lens antenna |
| CN115441206B (en) * | 2022-09-28 | 2023-07-18 | 珠海中科慧智科技有限公司 | Lens antenna |
| DE102022212737A1 (en) | 2022-11-28 | 2024-05-29 | Vega Grieshaber Kg | LEVEL MEASURING DEVICE, SYSTEM AND USE OF METAMATERIAL |
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