62 results about "Dielectric lens" patented technology

The invention provides a three-dimensional holographic imaging method. The method comprises the following steps: loading a holographic pattern to be imaged to a spatial light modulator; modulating a preset laser source by using a spatial light modulator loaded with a holographic pattern to form a first wavefront with initial phase information; carrying out primary scattering on the first wavefront by adopting a first turbid medium lens to form a second wavefront; compensating the second wavefront by adopting a metasurface compensation unit to form a third wavefront; after a second turbid medium lens is adopted to carry out secondary scattering on the third wavefront, a holographic imaging system is utilized to carry out imaging; wherein the metasurface compensation unit is determined according to a transmission matrix of the first turbid medium lens and a transmission matrix of the second turbid medium lens. The imaging view angle can be effectively increased, and the space bandwidth product can be improved.

The invention discloses a dielectric lens and a dielectric lens antenna. The dielectric lens comprises B lens units, the B lens units are distributed in an array to form a lens array which is square on the whole, the middle part of the lens array is circular, the lens units distributed at the edge position of the array are higher than the lens units distributed at the circular position in the middle of the array, and the middle position of the lens unit array forms a circular concave cavity. The whole lens unit is a cuboid and comprises two impedance matching layers and a square dielectric cylinder, and the two square end faces of the square dielectric cylinder are connected with the impedance matching layers respectively. And four cube-shaped through holes are symmetrically formed in the middle of the impedance matching layer. The dielectric lens antenna comprises the dielectric lens and a feed source antenna, and the feed source antenna is arranged on one side of the dielectric lens and located at the position of an extension line of the geometric center of the dielectric lens. The dielectric lens provided by the invention has relatively high transmissivity, and the dielectric lens antenna has more excellent gain performance, broadband coverage and relatively low production cost.

The invention relates to the technical field of antennas, in particular to a millimeter wave three-beam all-dielectric lens antenna, which comprises a group of 2 * 2 magnetoelectric dipole array antennas and an all-dielectric circular lens structure, the 2 * 2 magnetoelectric dipole array antenna is used as a feed source and is arranged on the plane side of the all-dielectric circular lens structure, and the feed source directly faces the geometric center of the all-dielectric circular lens structure; the all-dielectric circular lens structure has a direction-controllable three-beam radiation capability; through the reasonable medium structure layout, the multi-beam coverage and the frequency point adaptability are considered while high-gain output is ensured, and the contradiction between the performance and the practicability of the existing scheme is overcome.

Disclosed is a scanning-array radar device comprising a transmitter and a receiver; wherein the transmitter comprises a first lensed scanning-array transmitter unit comprising: an array of transmit antennas each having a respective output feed spaced apart along a first axis; a radio frequency, RF, integrated circuit, IC, configured to operate with the array of transmit antennas as a scanning-array transmitter, and a lens configured to focus radiation from each of the output feeds; and wherein the receiver comprises a first lensed scanning-array receiver unit comprising: an array of receive antennas each having a respective input feed spaced apart along a second axis; a radio frequency, RF, integrated circuit, IC, configured to operate with the array of receive antennas as a scanning-array receiver, and a lens configured to focus radiation reflected from a target towards each of the input feeds.

The invention aims to provide a medium-loaded ultra-wideband miniaturized double-ridged horn antenna, and belongs to the technical field of double-ridged horn antennas. A dielectric structure loaded on a horn mouth surface in the antenna comprises a dielectric lens, a dielectric flat plate and a dielectric guide section with a specific shape, and through loading of an integrated dielectric structure formed by the dielectric lens, the dielectric flat plate and the dielectric guide section, impedance mutation from a metal waveguide to a free space can be optimized, and reflection is reduced; electromagnetic waves are guided to converge, beam divergence is reduced, and the directivity and gain of a main lobe are improved; meanwhile, the wavefront of the horn mouth electromagnetic wave can be corrected to be a plane wave, phase distortion is reduced, and the far-field directivity is improved; focused electromagnetic waves are refracted, side lobes are reduced, and main lobe gain is improved. The ultra-wide-band miniaturized double-ridge horn antenna has excellent comprehensive performance of ultra wide band, miniaturization, high gain and low side lobe.

An antenna module includes a mounting board with a flat plate shape, and a power supply circuit to supply a radio frequency signal. The power supply circuit is mounted on the mounting board, and a radiating electrode is arranged on the power supply circuit. A dielectric fills a region around the power supply circuit and the radiating electrode. A conductive layer covers at least part of the dielectric. In the dielectric, a lens part is formed at a position overlapping the radiating electrode in plan view of the mounting board. The dielectric includes a first region in which the lens part is formed and a second region other than the first region, and the conductive layer is formed in the second region.

The proposed dielectric beamformer may be used to provide beam-forming of a transmitted radio-frequency (RF) signal. The dielectric beamformer includes a dielectric lens that provides a means of quickly steering a peak beam of the RF signal in a specific direction, allowing tracking of a distant signal, or multiple distant signals. Moreover, the beam of the RF signal can be steered to place a null in a chose direction to reduce interference. The dielectric beamformer includes a dielectric lens, which includes a first layer including a plurality of photo-voltaic (P-V) cells and a second layer including a plurality of piezoelectric cells, and one or more light sources arranged to emit light beams towards the P-V cells of the first layer. The piezoelectric cells are electrically connected to the P-V cells to receive the electricity produced in the P-V cells.

The invention discloses an antenna regulation and control method based on collaborative design of a gradient refractive index dielectric lens and a hyperbolic reflecting surface, and belongs to the technical field of communication, and the method comprises the following steps: S1, collaborative design of the gradient refractive index dielectric lens and the hyperbolic reflecting surface: designing the gradient refractive index dielectric lens, spatial shaping is carried out on a wavefront phase by utilizing the characteristic of a non-uniform material, so that accurate regulation and control on electromagnetic waves are realized; a hyperbolic reflecting surface is designed, and spherical waves radiated by a feed source are efficiently converted into collimated plane waves by using geometric focusing characteristics of the hyperbolic reflecting surface; s2, optimizing and integrating an antenna structure; s3, data collection and preprocessing; s4, constructing and training a deep learning beam optimization algorithm; s5, applying a beam optimization algorithm and performing real-time regulation and control; according to the invention, through collaborative design and a deep learning algorithm, the technical bottleneck of a traditional antenna is broken through, the main lobe gain and the pointing precision are remarkably improved, the side lobe interference is reduced, and the antenna is suitable for scenes such as satellite communication and high-precision navigation and is compatible with various communication standards.

An antenna assembly includes a substrate stack 105 comprising a magnetodielectric material, at least one patch radiating element 102 on an upper surface of the substrate stack 105, and a dielectric cover 200 including a gradient lens 204 disposed over the substrate stack 105. The gradient lens 204 includes a first lens portion having a first dielectric constant, DkL1, and a second lens portion having a second dielectric constant, DkL2, different from the first dielectric constant, DkL1.

The utility model provides a high-temperature testing device for a complex dielectric constant in a free space. The high-temperature testing device comprises a dielectric lens, a transmitting antenna, a receiving antenna, a sample bracket, a high-temperature furnace and a vector network analyzer, the vector network analyzer is connected with the transmitting antenna and the receiving antenna through a microwave cable, the phase center of the transmitting antenna / receiving antenna is located at one focus of the dielectric lens, and the sample frame center of the sample support is located at the other focus of the dielectric lens; the two faces, facing the dielectric lens, of the high-temperature furnace are heat insulation flat plates, and heating resistance wires are arranged on the other four faces. According to the testing method, based on the complex dielectric constant and the thickness of the heat insulation flat plate, de-embedding is carried out on the influence of the heat insulation flat plate by adopting a network cascading method. The device has the characteristics of good heating uniformity and high test precision, and can effectively deduct system errors introduced by the heat insulation flat plate of the high-temperature furnace, so that the accuracy of a test result is ensured.

Provided herein are various enhancements for electronically scanned arrays (ESAs) and performance thereof. In an example implementation, an apparatus is provided that includes an ESA and a dielectric lens applied to the ESA. The dielectric lens includes a domed arrangement formed from dielectric material. The dielectric lens advantageously allows beam scan operations performed by the ESA across a directional range to achieve a target performance over a target bandwidth.

A hydraulic cylinder assembly includes a cylinder body, a piston configured to slide within an interior of the cylinder body, and a cylinder head coupled to the cylinder body. The cylinder head includes a cavity, and a bore that extends between the cavity and the interior of the cylinder body. The hydraulic cylinder assembly includes a radar sensing unit disposed within the cavity. The radar sensing unit includes a radar signal emitter and a radar signal detector oriented respectively to emit and detect radar signals through the bore into the interior of the cylinder body. The hydraulic cylinder assembly includes a dielectric lens between the radar sensing unit and the interior of the cylinder body, the dielectric lens having a convex side facing the radar sensing unit and a planar side opposite the convex side facing the interior of the cylinder body.

The application relates to a preparation method of a multilayer dielectric lens and the multilayer dielectric lens, and is applied to the technical field of lenses.The method comprises the following steps: obtaining design parameters of the multilayer dielectric lens; calculating the filling rate of dielectric lens material in a cubic lattice contained by each dielectric layer according to the dielectric constant of the dielectric lens material and the dielectric constant of each dielectric layer; further calculating the side length of a square bottom surface of a hollow cuboid in the cubic lattice contained by each dielectric layer; based on the number of layers of the multilayer dielectric layer, the radius of each dielectric layer, the side length of the lattice and the side length of the square bottom surface of the hollow cuboid in the cubic lattice contained by each dielectric layer, the dielectric lens material is used to be 3D-printed layer by layer from the innermost dielectric layer to the outermost dielectric layer, so that the multilayer dielectric layer is obtained; based on the radius and the central angle of the reflecting layer, the reflecting layer is 3D-printed by using a metal material, and the multilayer dielectric layer and the reflecting layer are assembled to obtain the multilayer dielectric lens.The application can meet the precision requirement of a high-frequency luneberg lens.

This invention discloses a Ka-band focusing array dielectric lens based on impedance matching, comprising several dielectric lens units. Each dielectric lens unit has a three-layer dielectric structure, consisting of a front dielectric substrate, a middle phase modulator, and a rear dielectric substrate, arranged according to the electromagnetic wave incident direction. The dielectric constants of the three dielectric layers are set according to preset conditions. The thicknesses of the front and rear dielectric substrates are set based on the wavelength of the electromagnetic wave in their respective media. The thickness of the middle phase modulator is calculated based on the compensation phase of the lens unit. This invention reduces interface reflection loss by adjusting the thickness of the front and rear dielectric substrates and achieves phase compensation for different dielectric lens units by adjusting the thickness of the middle phase modulator, thereby improving the electromagnetic wave focusing performance.

The low-profile ultra-wideband folding horn antenna comprises a dielectric lens, a horn antenna body and a metal back cavity which are sequentially arranged from top to bottom, the horn antenna body is arranged in the metal back cavity, and the metal back cavity wraps the bottom of the horn antenna body and at least two symmetrically-arranged side walls. According to the invention, the coaxial cable is adopted for direct feeding, and the multiple bent radiation arms are introduced, so that the profile height of the horn antenna is greatly reduced and the antenna structure is simplified; meanwhile, by loading the dielectric lens and the metal side wall, the gain in the working frequency band is remarkably improved, and the dielectric lens and the shielding cover are integrally formed, so that processing and mounting are facilitated. The antenna has the ultra-wideband characteristic, and the low-frequency gain performance is stable; the cross polarization level is lower than-34 dB, the radiation pattern is symmetrical and good in directivity, and the overall radiation performance is stable. The antenna is low in profile, simple in structure, small in size, low in manufacturing cost and capable of meeting the requirements of a 5G communication indoor distribution system.

An optical device 1a includes a lens array 10 and a transparent dielectric array 20. The lens array 10 includes a plurality of lenses 11. In the lens array 10, the lenses 11 are arrayed such that the optical axes thereof are substantially parallel to each other. The transparent dielectric array 20 includes a plurality of transparent dielectrics 21. In the transparent dielectric array 20, the transparent dielectrics 21 are arrayed such that the central axes thereof are substantially parallel to each other. The lens array 10 and the transparent dielectric array 20 are arranged such that the optical axes of the lenses 11 and the central axes of the transparent dielectrics 21 are substantially parallel to each other, and that an end surface of the lens array 10 and an end surface of the transparent dielectric array 20 face each other.

This invention discloses a low-profile ultra-wideband folded horn antenna, comprising a dielectric lens, a horn antenna, and a metal back cavity arranged sequentially from top to bottom. The horn antenna is placed within the metal back cavity, which encloses the bottom of the horn antenna and at least two symmetrically arranged sidewalls. This invention employs direct coaxial cable feeding and introduces multiple bent radiating arms, significantly reducing the profile height of the horn antenna and simplifying its structure. Simultaneously, by loading the dielectric lens and metal sidewalls, the gain within the operating frequency band is significantly improved. The dielectric lens and shielding cover are integrally formed, facilitating processing and installation. This antenna exhibits ultra-wideband characteristics, stable low-frequency gain, a cross-polarization level below -34dB, a symmetrical radiation pattern with good directivity, and stable overall radiation performance. This invention's antenna features a low profile, simple structure, compact size, and low manufacturing cost, meeting the requirements of 5G communication indoor distribution systems.

The present invention relates to a radar level measuring device with a housing, wherein the housing can be connected in a sealing manner to an accommodating portion, wherein the housing is configured at the front as a process connection and wherein a dielectric lens is disposed at the front of the housing and connected to the process connection such that the lens is fixed in the axial direction relative to the housing, by a positive connection being formed between the lens and the process connection.

The application discloses an L-band dielectric lens and a lens antenna for satellite multi-beam communication and belongs to the technical field of communication.The lens designed by the application is a cylindrical flat plate lens and is composed of a plurality of concentric circular ring layers.Each circular ring layer is arranged in a circular ring shape around the center by fan ring structure units of the same configuration, and the dielectric constant of each layer gradually decreases from the center to the edge.Compared with a traditional flat plate lens after optical transformation, the lens can realize miniaturization without complex optical transformation, has a simple structure, the lens thickness can be adjusted at will, and the lens can be quickly prepared by using 3D printing.The fan ring structure unit combining the "Y" shape and the circular perforation shape is used as an equivalent dielectric constant model, so that the dielectric constant is closer to the ideal gradient change, and the lens is closer to the ideal effect, so that the lens can be used in the lens antenna, and the working performance is further improved.

The invention discloses an annular dielectric loaded terahertz high-gain luneberg lens antenna unit and array, the appearance of an upper layer metal structure (A) and a lower layer metal structure (B) of the antenna unit is a semi-circular ring located on one side of a rectangle, the upper layer metal structure (A) covers the lower layer metal structure (B), and the lower layer metal structure (B) covers the upper layer metal structure (A). The stepped disc dielectric lens (C) is located between the upper-layer metal structure (A) and the lower-layer metal structure (B), the annular dielectric lens (D) is located on the outer side of a semicircular ring of the upper-layer metal structure (A) and the outer side of a semicircular ring of the lower-layer metal structure (B), and the two ends of the annular dielectric lens (D) are fixed to the two sides of the lower-layer metal structure (B) through screw hole sites (D3). The stacking spacing of the array is far more than one half of the free space wavelength, so that the processing difficulty can be reduced, and the high-gain radiation characteristic can be effectively realized; the annular dielectric lens is loaded at the tail end of the luneberg lens antenna, so that the grating lobe effect of a large-spacing array can be eliminated, and the original beam scanning capability is reserved.

The invention relates to the technical field of millimeter wave antennas, and provides a dielectric-lens-based 79GHz high-gain millimeter wave liquid level meter antenna, which comprises a dielectric substrate, a radiation patch, a parasitic patch, an annular directional coupler and a dielectric lens, and is characterized in that the radiation patch is arranged at the central position of the surface of the dielectric substrate; the parasitic patch is arranged on the surface of the dielectric substrate and concentrically arranged around the radiation patch; the annular directional coupler is arranged on the dielectric substrate and is electrically connected with the radiation patch through the microstrip transmission line; and the dielectric lens is arranged above the dielectric substrate and is coaxially aligned with the radiation unit formed by the radiation patch and the parasitic patch. According to the millimeter wave antenna, the working bandwidth is expanded and the radiation efficiency is improved by utilizing the electromagnetic coupling effect of the parasitic patch, the receiving and transmitting channel isolation greater than 25dB is realized by combining the annular directional coupler, and the gain and directivity of the millimeter wave antenna are remarkably improved based on the refraction focusing principle of the dielectric lens; and the antenna can be applied to industrial application scenes of high directivity and long-distance ranging.

Antenna device (U) for transmitting and receiving electromagnetic waves through an externally arranged cover element (B), the antenna device comprising: a first (2a) and a second (2b) antenna section which are arranged adjacent to each other along a direction orthogonal to a predetermined direction in which the electromagnetic waves (Fx1, Fx2) are transmitted, and which respectively transmit the electromagnetic waves (Fx1, Fx2); a first (5a) and a second (5b) dielectric lens which are arranged in the predetermined direction in front of the first and second antenna sections (2a, 2b), respectively, and which respectively narrow the beams of the electromagnetic waves (Fx1, Fx2) transmitted from the first and second antenna sections (2a, 2b) and transmit the beams of the electromagnetic waves (Fx1, Fx2) to the outside, wherein an outer end surface of the first dielectric lens (5a) projects further forward in the predetermined direction than an outer end surface of the second dielectric lens (5b), so that a distance (D1) between the cover element (B) and the outer end surface of the first dielectric lens (5a) in the predetermined direction is shorter than a distance (D2) between the cover element (B) and the outer end surface of the second dielectric lens (5b) in the predetermined direction.

The invention discloses a static millimeter wave wide-field dual-polarization superstructure detector for non-interactive personnel security inspection, and belongs to the technical field of detectors. The electromagnetic receiving and transmitting module is used in cooperation with a built-in micro-motion rotary table, a system-level static wide-view-field scanning mechanism is achieved, dynamic time sequence beam deflection can be achieved, and the electromagnetic receiving and transmitting module is a wide-view-field super-structure lens; the built-in micro-motion turntable controls the transmitting and receiving feed antenna of the electromagnetic receiving and transmitting module to regulate and control the direction of millimeter wave transmitting and receiving beams, so that directional signal transmitting and receiving in a large range are realized; the data acquisition module is used for reading the recovered voltage signals converted by the co-polarization and cross-polarization scattering echoes; and the upper computer module is used for analyzing the acquired dual polarization data. The invention aims to replace a heavy and clumsy dielectric lens in a traditional millimeter wave personnel security inspection system, so that the wide-view-field scanning performance is improved while the integration level and the lightweight level of the system are improved.

The application relates to the field of communication technology and discloses a high-gain medium vortex antenna, which comprises a feed horn antenna and a medium vortex lens; the feed horn antenna is used for generating a spherical wave; the hyperboloid of the feed horn antenna and the medium vortex lens is connected through an optical principle; the feed horn antenna is arranged at the focal point of the hyperboloid of the medium lens; the medium lens converges and collimates the spherical wave generated by the feed horn antenna to form a plane wave; the medium vortex lens transmits a stepped spiral structure to form a vortex electromagnetic wave; the vortex electromagnetic wave is designed according to a mode calculation formula of the vortex electromagnetic wave; theoretically, any required mode can be obtained; the vortex electromagnetic wave generated in this way has the characteristics of high power and is helpful to long-distance transmission in a wireless communication system. The high-gain medium vortex antenna has the advantages of high gain, high isolation and light weight.

The invention relates to the technical field of antennas, in particular to a foldable transmission array antenna based on a Kirgami structure, which comprises a dielectric lens array and a Ku wave band standard gain horn antenna positioned on one side of the dielectric lens array, the dielectric lens array is composed of 16 * 16 lens units, each lens unit comprises four dielectric cylinders and four dielectric sheets, and one dielectric sheet is embedded between every two dielectric cylinders; the lens unit is switched between an unfolded state and a folded state; a pure mechanical structure is adopted to achieve the folding function, and the problems caused by fatigue of flexible materials and active devices are avoided.

The invention relates to a radar level measuring device for detecting a level in a container, comprising: a main transmitter for transmitting and receiving radar waves; a dielectric lens for transmitting and receiving the radar waves; a waveguide unit for guiding the radar wave between the main transmitter and the dielectric lens; wherein the dielectric lens and the waveguide unit are arranged at an interval.

The application discloses a medium lens, a radiation unit and a base station antenna, the medium lens is arranged above a vibrator, and the medium lens comprises a spherical body and a support; a beam adjustment cavity is constructed in the spherical body; the upper end of the support is connected with the spherical body, and the lower end of the support is used for fixing; the spherical body and the beam adjustment cavity are configured to: different phase compensations are performed on electromagnetic waves incident in different directions, so that the beams are focused; electromagnetic wave phase compensation and beam focusing are realized through the cooperative design of the spherical body and the beam adjustment cavity, the structural strength, the manufacturing process and the electromagnetic performance are taken into account at the same time, the gain and the comprehensive performance of the base station antenna are significantly improved, and the development requirements of 5G / 6G base station antenna miniaturization, low cost and high consistency are adapted.

The invention discloses a spatial domain and frequency domain filtering antenna which comprises a feed structure, an SIW slot antenna structure and a dielectric lens structure. The SIW slot antenna structure is located above the feed structure, the SIW slot antenna structure is electrically connected with the feed structure, the SIW slot antenna structure is provided with an SIW cavity, a coupling metal layer located on the SIW cavity and a first metal patch located on the coupling metal layer, and a slot is formed in the coupling metal layer; the dielectric lens structure is located above the SIW slot antenna structure, the dielectric lens structure is provided with a cavity and a second metal patch located on the cavity, and the cavity and the second metal patch are used for restraining the electromagnetic waves radiated by the first metal patch to form a flat-topped wave beam. The antenna provided by the technical scheme of the invention not only realizes the filtering characteristic on the traditional frequency domain, but also realizes the filtering characteristic on the space domain of the H surface, and can meet the design requirements of multiple functions and integration.

A lens is configured to be disposed on spaced apart antenna elements of a phased array antenna. The lens includes a first major surface facing away from the elements and an opposing second major surface facing the elements, and opposing first and second end portions extending from the second major surface toward the first major surface and joined to the first major surface by opposing first and second joint portions. The first and second major surfaces are substantially planar and are parallel to the first and second planar portions, respectively. When projected onto a reference plane parallel to the first planar portion and the second planar portion, a ratio of a total projected area of the first planar portion to a projected area of the lens is at least 0.15, and a ratio of a total projected area of the second planar portion to the projected area of the lens is at least 0.1.

The dielectric lens includes a three-dimensional (3D) body of dielectric material having a spatially varying permittivity (Dk), the 3D body having three or more regions R(i) having local maxima of permittivity values ​​Dk(i) relative to surrounding regions of each of the three or more regions R(i), the positions of the three or more regions R(i) being defined by local coordinates of azimuth angle (i), zenith angle (i), and radial distance (i) relative to a particular common origin associated with the 3D body, where (i) is an index ranging from 1 to 3 or more, and the spatially varying Dk of the 3D body is configured to vary as a function of zenith angle between a first region R(1) and a second region R(2) at a given azimuth angle and at a given radial distance.