144 results about "Luneburg lens" patented technology

A radio wave lens antenna device including a semispherical Luneburg lens and a radio wave reflection plate. The radio wave lens antenna device prevents the signal reception sensitivity from being lowered in rain or snow. The radio wave lens antenna device includes a semispherical Luneburg lens 1, a radio wave reflection plate 2 that is larger than the diameter of the lens, an antenna element 3, and a holder 4 that holds the antenna element. The radio wave reflection plate 2 is arranged in an erected state. An ice-snow-water resistant means, which includes a first cover 5 and a second cover 6, prevents rain, snow, and ice from collecting and running off the Luneburg lens.

A multiple beam antenna system is described. The system may include a mounting structure, a first wireless access antenna, a second wireless access antenna, and a radio frequency lens. The first and second wireless access antennas may be mounted to the mounting structure. Columns of radiating elements of the first and second wireless access antennas may be aligned with the radio frequency lens. The radio frequency lens may be modular in a longitudinal or radial direction, or in both directions. The radio frequency lens may include a plurality of compartments arranged to form a first cylinder made up of concentric, coaxial cylinders and a plurality of dielectric materials in at least some of the plurality of compartments.

The invention discloses a lightweight dielectric-filled multi-beam cylindrical Luneberg lens antenna applied to multi-beam directional communication and beam scanning. The basic structure of the lightweight dielectric-filled multi-beam cylindrical Luneberg lens antenna comprises a cylindrical Luneberg dielectric lens and a curved array (3), wherein the curved array (3) comprises a plurality of E-shaped microstrip antenna feed sources; the cylindrical Luneberg dielectric lens between two parallel metal plates (4) is divided into three layers, namely an outer layer lens (11), a middle layer lens (12) and an inner layer lens (13); the three layers all adopt lightweight foam with a low dielectric constant as a substrate material; holes are formed in the substrate material and are filled with dielectric rods with high dielectric constants; the holes in the three lenses sequentially become dense from the outside to the inside; and the curved array (3) is fixed between the two parallel metal plates (4). The holes are formed in the substrate material with the low dielectric constant and are filled with a dielectric material with a high dielectric constant, so that required gradient dielectric constant is achieved; and lightweight of the antenna is achieved when the electrical property of the antenna is met.

The invention discloses an electrically large highly-efficient luneberg lens antenna with the smallest layering number, which is applied to wideband high-capacity satellite communication. The basic structure of the antenna comprises a semispherical luneberg lens antenna, a highly-efficient Ku / Ka feed source, a metal baffle board and dual quarter annular guide rails, wherein the semispherical luneberg lens antenna adopts polytetrafluoroethylene as an outer layer, adopts polyethylene as an inner core, and is fixed on the surface of the metal baffle board; the feed source can slide along the dual annular guide rails, and simultaneously can radially regulate a focal length, so that incident wave beams of the feed source in the different frequency ranges of Ku and Ka can cover the lens antenna to different extents, and can be aligned with a satellite for tracking and uplink or downlink communication. Based on the basic structure, industrial plastic material sorts, a board number and board connecting ways are rationally changed to form other specific embodiments.

The invention discloses a very-low-profile cylindrical Luneberg lens antenna based on a novel dielectric filling mode. The very-low-profile cylindrical Luneberg lens antenna comprises a cylindrical Luneberg lens, an arc feed source array (1) and an arc metallic reflection baffle plate (2), wherein the cylindrical Luneberg lens is arranged between an upper metal cover plate (3) and a lower metal cover plate (4), the arc feed source array (1) is arranged on a focal line of the cylindrical Luneberg lens, the arc metallic reflection baffle plate (2) is arranged on a non-radiation aperture of the cylindrical Luneberg lens, the cylindrical Luneberg lens comprises an upper filling dielectric piece (6) and a lower filling dielectric piece (5) which have different radii, n layers of through holes (21) and m layers of through holes (21) which have different distribution densities are respectively arranged on the upper filling dielectric piece (6) and the lower filling dielectric piece (5) from circle centers towards theoutside, m is larger than n, and the effective dielectric constants of the front n layers of two dielectric pieces are correspondingly the same. The very-low-profile cylindrical Luneberg lens antenna is simple to process, low profile and light weight are achieved, and the very-low-profile cylindrical Luneberg lens can be used for a multi-beam directional communication and beam scanning antenna better, particularly for millimeter-wave high frequency bands and application occasions requiring axial arraying.

The invention discloses a method for machining a perforated structure form luneberg lens and relates to the technical field of manufacturing of a perforated luneberg lens antenna. The method mainly comprises the following steps of designing parameters, such as the caliber, a layer number along the radial direction, the number of each layer of holes, and the shape of the holes, of the perforated structure luneberg lens, through electromagnetic software simulation; according to the designed parameters, adopting large 3D (three-dimensional) software to model the perforated structure form luneberg lens antenna; guiding the built model into 3D printing equipment, and preparing the perforated structure form luneberg lens by 3D printing technology. The method is high in machining precision, high in efficiency and low in cost, is not affected by a gap layer, and is particularly suitable for machining the whole perforated luneberg lens.

The invention discloses a manufacture method of a hemispherical luneberg lens antenna. Hollow cavities are distributed in the hemispherical luneberg lens antenna; the hemispherical luneberg lens antenna is provided with a hemispherical surface and a bottom plane, and the bottom plane passes by a sphere center. The manufacture method is characterized by comprising steps as follows: (1), a material used for manufacturing the hemispherical luneberg lens antenna is selected; (2), structure parameters of the hemispherical luneberg lens antenna are determined; (3), a hemispherical luneberg lens antenna three-dimensional digital model with the structure parameters is manufactured; (4), the hemispherical luneberg lens antenna is manufactured according to the three-dimensional digital model with a material increase manufacturing method; (5), a metal foil layer is attached to the bottom plane. The shape, the size and distribution of hollow cavity structures in the manufactured hemispherical luneberg lens antenna are adjustable and controllable, the average dielectric constant of concentric layers is accurately controlled, and different design requirements can be met; the manufacturing materials are wide, the production process is simple, the rate of finished products is high, interlayer gaps are avoided, and the product quality is more stable and reliable.

The invention discloses a luneberg lens antenna which comprises a metamaterial luneberg ball and a feed source arranged on the surface of the metamaterial luneberg ball. The metamaterial luneberg ball is formed by overlying a plurality of parallel metamaterial flat plates, and each metamaterial flat plate comprises a sheet-shaped base material and a plurality of artificial microstructures arranged on the base material. The connection line of the feed source and the ball center is perpendicular to the metamaterial flat plates. The refractive indexes at the same polar radius position on the metamaterial luneberg ball are identical, and the refractive index distribution rule of the whole metamaterial luneberg ball meets the requirements of the traditional luneberg ball. According to the luneberg lens antenna, the metamaterial luneberg ball is formed overlying the sheet-shaped metamaterial flat plates without processing curved surfaces, and therefore the luneberg lens antenna is easy to manufacture and process and low in cost.

The invention discloses a millimeter-wave fan beam cylindrical Luneberg lens antenna based on a metal perturbation structure. The antenna achieves a pitch beam width reaching 104 degree and azimuth plane + / - 60 degree scanning. The antenna comprises a cylindrical Luneberg lens located between an upper metal flat plate (1) and a lower metal flat plate (2); an arc feed source array (3) located on the focal line of the cylindrical Luneberg lens; and the metal perturbation structure (5) arranged on the radiating aperture of the lens circumferentially. The cylindrical Luneberg lens comprises a cylindrical filling dielectric sheet (4). The filling dielectric sheet uses a low-loss microwave substrate as a substrate material and is divided into five layers according to a concentric circle structure from inside to outside. Respective layers have through-holes with different densities. The through-holes are filled with air. The antenna is light in weight and easy to process, greatly increases the pitch surface beam width, realizes a wide beam scanning range in the horizontal plane so as to be better applied to a multi-beam directional communication and beam scanning antenna, especially the millimeter wave high-frequency band and applications requiring axial grouping.

The invention discloses a super surface lens antenna based on optical transformation and a manufacturing method of the super surface lens antenna. A super surface lens based on the optical transformation comprises a dielectric substrate, a feed source and a lens body, wherein the feed source and the lens body are arranged on the dielectric substrate, and the refractive index distribution of the lens body is formed by carrying out optical transformation on the luneberg lens refractive index. The manufacturing method of the super surface lens based on the optical transformation comprises the step of transforming the refractive index distribution of the luneberg lens into the refractive index distribution of the lens body through optical transformation, and the step of integrating a U-type structure unit and the feed source on the dielectric substrate according to the refractive index distribution of the lens body. The lens has the effect of directed radiation of a traditional luneberg lens, meanwhile, the transformed lens has a leveled focusing surface, and better feed and integration are facilitated.

The invention provides a novel production method of a Luneberg lens. A high-performance Luneberg lens with stable indicators can be manufactured under the conditions of room temperature, normal pressure and low cost. The production method comprises the following steps: a half shell is prepared as a lens half shell, an adhesive is sprayed on the inner wall surface of the lens half shell, the prefabricated first granular material is laid into the lens half shell, the first granular material is pressed by a punch to form a first dielectric layer, the adhesive is sprayed on the surface of the first dielectric layer, the second granular material is laid on the surface of the first dielectric layer and pressed and the like so that a half Luneberg lens is obtained, and then the two half Luneberglenses are bonded together to form a single Luneberg lens. The production method of the Luneberg lens has the advantages of simple production process, low production cost, low weight, easy control oflens characteristics and excellent lens performance indicators and the like.

A Luneburg lens is used in conjunction with a patch antenna array. The patch antenna array is conformed or adapted to cover a portion or backside of the Luneburg len's surface with the backplane of the conformed antenna array defining a field of regard (FOR) in which objects are detected and tracked. A processor is connected to a receiver / exciter module which connects to transmit / receive modules which are connected to the individual patch antennas through a network of MEMS switches. In a receive mode, selected subarrays of the conformed patch antenna array are scanned during selected time intervals with the sum and delta beams being formed coherently in amplitude and phase to realize amplitude monopulse sensing and angle tracking of an object.

The invention relates to a Luneberg lens design method based on a 3D printing technology. Firstly, m kinds of 3D printing materials are selected, and the Luneberg lens unit type and the Luneberg lensunit size are determined; according to the Luneberg lens effective dielectric constant, the unit type and the unit size, void contents of all points of Luneberg lens units are determined; according tothe obtained unit type, the obtained unit size and the obtain void contents of all points of the Luneberg lens units, corresponding Luneberg lens 3D models are built, and whether the Luneberg lens 3Dmodels meet spherical radial graded refractive index profile or not is verified; and finally, the Luneberg lens 3D models meeting the spherical radial graded refractive index profile are printed, anda Luneberg lens is generated. Compared with an existing technology, the method achieves quick molding of the Luneberg lens through the 3D printing technology, and has the beneficial effects that theprinting accuracy is high, each printing element dielectric constant can be controlled singly, the true graded refractive index is achieved, and the product performance is guaranteed.

The invention discloses a manufacturing method of a luneberg lens antenna. The method comprises the following steps of carrying out pre-foaming treatment on a foam material; preparing the pre-foamed foam material according to design values of various lens layers of the luneberg lens antenna to obtain foam a material particle composition and manufacturing a corresponding mold; adding the material particle composition to the corresponding mold for molding to obtain the lens layers of the luneberg lens antenna; and assembling the lens layers. According to the technical scheme, the accuracy of dielectric constants of the lens layers of a luneberg lens can be improved; and the change of the dielectric constants of the luneberg lens is closer to the ideal change rule, so that the working performance of the luneberg lens antenna is improved.

An easy-to-install Luneberg lens antenna device constituted by combining a hemispherical Luneberg lens and a radio wave reflector. The Luneberg lens antenna device comprises an antenna fixing jig (2), and a fixing means, e.g., a bolt (3), for fixing the radio wave reflector (1b) of the antenna device (1) removably to the antenna fixing jig (2). The reflector (1b) and the antenna fixing jig (2) are previously provided, respectively, with fixing parts for fixing by the fixing means, the antenna fixing jig (2) is fixed to an antenna installing section and the reflector (1b) is fixed to the antenna fixing jig (2) by the fixing means.

The invention discloses a deformation luneberg lens based on novel metamaterials. The lens is formed by the way that fifteen layers of round dielectric sheets are arrayed in the radial direction in an equally-spaced mode, and I-shaped metal structure units are periodically distributed on each layer; the sizes of I-shaped structures which are attached to the sheets far away from the center of the lens are smaller and smaller, and the equivalent dielectric constants are smaller; the equivalent dielectric constant of the outermost layer is one approximately, the equivalent magnetic conductivity is also one approximately, and thus the air layer attaching purpose is achieved. Compared with a traditional luneberg lens, the deformation luneberg lens is changed in that the position of a feed source is varied, and a round rail is arranged in the deformation luneberg lens to allow the feed source to move. A cylindrical wave generated by the feed source is emergent in the mode of a plane wave under the action of the lens, the emergent direction of the plane wave is changed along with the movement of the feed source on the rail, and thus wide-angle scanning of beams is achieved. The deformation luneberg lens based on novel metamaterials is simple in design and manufacture and capable of converting the cylindrical wave into the plane wave, thereby having a wide application prospect in the fields of radar, antennas and the like.

The invention discloses a variable column surface / spherical surface luneburg lens antenna based on phased array feeding, and belongs to the technical fields of wireless communication and radars. The antenna comprises a variable column surface / spherical surface luneburg lens, and a plurality groups of active plane phased array antennas serving as a feed source. By virtue of reasonable design of theposition relationship between the variable luneburg lens and the phased array antennas, and optimization of excitation coefficients of the phased array antennas serving as the feed source, wave beamsare formed in the needed direction, and wave beam electric scanning or simultaneous multi-beam wave scanning is realized. Compared with a traditional luneburg lens, the antenna disclosed in the invention has the characteristics and advantages of high gain, high effective isotropic radiated power (EIRP), high scanning precision, low mass and small volume, and convenience in processing and system integration by adopting the plane array feed source, so that the antenna can be applied to a radar and communication system.

The invention relates to the technical field of antennas, in particular to a flattened luneberg lens antenna, including a first medium, a second medium, a third medium, a fourth medium, a fifth medium, a sixth dielectric, a waveguide feed source, a first printed board and a second printed board, the first medium, the second medium, the third medium, the fourth medium, the fifth medium and the sixth medium are concentrically placed from the inside to the outside to form a cylinder, the waveguide feed source is located at the edge of the cylinder, and the first printed board and the second printed board are respectively bonded to the upper and lower surfaces of the cylinder. While the flattened luneberg lens antenna of the invention realizes beam convergence in the E plane, in the H plane ofthe flattened luneberg lens antenna, due to the effect of a magnet ring of a loaded metal layer, electromagnetic waves are also close to the plane waves at the emergence end of the lens, compared with the case where the metal layer is not loaded, a directional diagram with a narrow beam and a low side lobe can be obtained in the H plane, and the performance is superior.

The invention provides a method for producing a Luneberg lens without using an adhesive, which comprises the following steps: fixing a hemispherical shell with an upward opening; hoisting a mold coreinto the hemispherical shell; wherein a plurality of layers of hemispherical shell cavities and a hemispherical core cavity are formed in the mold core; the sphere center corresponding to the hemispherical shell, the sphere center corresponding to each layer of hemispherical shell cavity and the sphere center corresponding to the hemispherical core cavity being concentric; filling corresponding granular materials between the mold core and the hemispherical shell, in each hemispherical shell cavity and in the hemispherical core cavity; the mold core can be selectively retained or pulled away; and combining the two half Luneberg lenses with the same specification together. The method for producing a Luneberg lens without using an adhesive has the advantages that the production process is simple, the production cost is low, the use of the adhesive can be avoided or greatly reduced, the weight is light, the lens characteristics are easy to control, the lens performance index is excellent,and the like.

The invention discloses a half-space beam-covered circularly polarized luneberg lens antenna for large-scale multi-beam directional communication and half-space range beam scanning. The basic structure of the antenna consists of a spherical array formed by a plurality of circularly polarized microstrip feed source antennas, a layered dielectric lens processed by the 3D printing technology and a spherical organic glass fixing support. The lens antenna uses small circularly polarized microstrip antennas as feed source antennas which from a feed source array in a hemispherical non-uniform form, the feed source array is embedded in the fixing support made of organic glass, which reduces the aperture occlusion problem during large-area beam scanning, realizes beam scanning in a half-space range, and solves a series of design and processing problems encountered in the process of designing a luneberg lens antenna in the application of half-space beam coverage, contributes to application of the luneberg lens antenna to the usage scenarios and corresponding market requirements of large-scale multi-beam directional communication and half-space range beam scanning.

The invention provides a luneberg lens. The luneberg lens comprises a luneberg lens unit and an antenna array fixed on the surface of the luneberg lens unit, and the antenna array is arranged on the circumferences of a plurality of concentric circles in a one-dimensional arc line or two-dimensional arc surface along the surface of the luneberg lens unit through a plurality of antenna units. Compared with the prior art, the antenna array is arranged on the surface of the single luneberg lens unit, large-angle beam scanning can be achieved by sequentially feeding the antenna units at the same positions in the antenna array on the surface of each luneberg lens unit, and the complexity and design difficulty of an antenna feed network are reduced. If only a certain angle or a certain directionneeds to be covered, the antenna units in other directions can be cut, so that the antenna array is simplified, the feed network is simplified, and the cost is easy to control.

The invention discloses a novel cylindrical surface luneberg lens antenna capable of realizing circular polarization or bi-circular polarization. The novel cylindrical surface luneberg lens antenna mainly comprises a linear polarization feed source antenna 1 which is attached to the circumferential surface of a cylindrical lens and of which the polarization direction is in a 45-degree angle to the axial direction of the lens (when bi-circular polarization is realized, the linear polarization feed source antenna 1 has to be changed into a bi-linear polarization feed source) , and a dielectric plate waveguide lens 2 which satisfies the required refractive index and allows horizontal polarization TE0 wave and vertical polarization TM0 wave to generate a rotary symmetric profile with a 90 degrees difference. The novel cylindrical surface luneberg lens antenna has a rotary symmetric structure, and is applicable to multi-beam scanning of an azimuth plane. An arc feed source array is only arranged on the circumference of the cylindrical dielectric plate waveguide lens, the distances between elements of the arc feed source array are adjusted according to the widths of the wave beams generated by a single feed source to realize uninterrupted wave beam scanning of the azimuth plane. The novel cylindrical surface luneberg lens antenna is simple in structure, and mature and stable in processing technology and is especially suitable for millimeter wave frequency range. Based on the basic structure of the novel cylindrical surface luneberg lens antenna, the linear polarization feed source types, the lens profile shape and antenna dimension are reasonably changed to from other embodiments of the invention.

The invention provides a low profile array antenna based on a Luneburg lens array. The low profile array antenna comprises m Luneburg lenses and a transceiving assembly, wherein the m Luneburg lensesare arranged on the same horizontal plane; each Luneburg lens comprises a Luneburg lens unit and an antenna array fixed to the surface of the Luneburg lens unit, and antenna units with identical pointing angles on different Luneburg lens units are antenna units at the same position; the transceiving assembly comprises a receiving module and a transmitting module; the n antenna units receive n paths of signals; the receiving module selects a plurality of paths of signals from the n paths of signals, and combines the plurality of paths of signals into a path of signals and outputs the path of signals to the transmitting module; and the transmitting module processes the path of signals and realizes multi-path signal output. The low profile array antenna has the advantages of realizing large-angle beam scanning through arranging the antenna arrays on the surface of the single Luneburg lens unit and sequentially feeding the antenna units at the same position in the antenna array on the surface of each Luneburg lens unit, and reducing the complexity and design difficulty of an antenna feeding network.

The invention provides a Luneberg lens antenna with a movable feed source, and the antenna is simple, compact and stable in structure. The antenna comprises the feed source, a global luneberg lens, afirst track part, a second track part and a connecting ring part. The first rail part is a tooth part bent into a semicircle; the second rail part is also a tooth part bent into a semicircle; the moving seat is provided with a first gear used for being matched with the teeth of the first rail part and a second gear used for being matched with the teeth of the second rail part; the first gear is driven by a first electric part, and the second gear is driven by a second electric device; a first shifting block part used for driving the first rail part to rotate relative to the connecting ring part and a second shifting block part used for driving the second rail part to rotate relative to the connecting ring part are further arranged on the moving seat; and the feed source is fixedly arrangedon the moving seat. A double-track mechanism is adopted, so that the coverage area of multi-beam waves passing through the surface of the luneberg lens can be flexibly adjusted, and the stability andreliability are achieved.

The invention relates to a liquid crystal metamaterial-based two-dimensional luneberg lens antenna, and aims at solving the technical problems that the lens antenna is great in loss, low in efficiency and small in bandwidth. According to the technical scheme, the two-dimensional luneberg lens antenna comprises a luneberg lens and an antenna feed source arranged on the surface of the luneberg lens along the axial direction, wherein the luneberg lens comprises at least one circle area; each circle area comprises a plurality of liquid crystal metamaterial units; each liquid crystal metamaterial unit comprises a first dielectric layer, one liquid crystal alignment layer, a liquid crystal cavity, another liquid crystal alignment layer and a second dielectric layer which horizontally overlap and are sequentially arranged; a luneberg lens structure patch is arranged on the surface of each first dielectric layer; and each liquid crystal cavity is used for being filled with a liquid crystal metamaterial, so that the problems are relatively well solved, and the liquid crystal metamaterial-based two-dimensional luneberg lens antenna can be applied to a microwave antenna.

The invention discloses a Luneberg lens with a variable RCS. The Luneberg lens comprises a dielectric sphere, a reflecting surface and an adjusting rod, wherein the dielectric ball is composed of multiple dielectric layers with dielectric constants changing in sequence; one end of the adjusting rod is fixedly connected with the reflecting surface, and the other end is connected with the driving mechanism; the adjusting rod is controlled by the driving mechanism to move, so that the reflecting surface is driven to move, and the RCS characteristics of the Luneberg ball are adjusted by changing the relative positions of the multilayer dielectric ball and the reflecting surface. According to the invention, the RCS of the Luneberg lens is changed by changing the relative positions of the multilayer dielectric ball and the reflecting surface; the Luneberg lens with the variable RCS can be used in cooperation with a target needing to change the RCS, and meanwhile, the variable RCS Luneberg lens is also suitable for various occasions needing to adjust the RCS.

A Luneburg lens antenna device includes a Luneburg lens, a plurality of patch antennas, and a plurality of low-frequency antennas. The Luneburg lens is formed in a cylindrical shape and includes three dielectric layers having different dielectric constants and stacked on each other in the radial direction. The plurality of patch antennas respectively include ground electrodes which cover the outer peripheral surface of radiating elements, and form high-frequency MIMO antennas. The plurality of low-frequency antennas are monopole antennas using the ground electrodes, and form low-frequency MIMO antennas.

The invention discloses a RCS controllable Luneberg lens reflector based on the active frequency selective surface. The reflector comprises a Luneberg lens and a reflecting plate, and the curvature ofthe reflecting plate is matched with that of the Luneberg lens. The Luneberg lens is spherical and comprises N dielectric layers with the relative dielectric constants decreasing in sequence from inside to outside. The reflecting plate comprises a plurality of AFSS reflecting units which are distributed in an array mode, and the AFSS reflecting units have the transmission function and the reflection function and can be switched. According to the Luneberg lens reflector, the AFSS reflecting surface is used for replacing a metal reflecting surface of a common Luneberg lens reflector. The stateof PIN diodes of an AFSS reflecting surface and the conduction and cut-off number of the PIN diodes are controlled through external DC voltage. The AFSS reflecting surface can be switched between a transmission state and a reflection state, and the reflection intensity of the AFSS reflecting surface is controlled, so that the size of the RCS of the Luneberg lens reflector is adjustable.

The invention belongs to the field of lens antennas, and discloses a luneberg lens antenna dielectric material, and a preparation method and an application thereof, the luneberg lens antenna dielectric material comprises a polymer microcellular foaming coiled material with a cell diameter of 10-50 [mu] m; wherein the polymer is at least one selected from polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyurethane and polycarbonate. According to the invention, the polymer coiled material is used as a raw material, and the pore foam size and distribution density of the microcellular foaming polymer can be accurately controlled by adjusting the pressure of an autoclave and the temperature / heating time of a heating pool, so that the dielectric constant with required gradient change is realized; and the luneberg lenses with different diameter requirements can be manufactured by setting the thickness and the number of turns of the coiled material.