7430results about "Antennas" patented technology

Provided is a method for tracking a satellite. The method includes: acquiring trajectory information and antenna attitude information of a COTM device; calculating a theoretical pointing angle of an antenna beam for a target satellite based on an orbit parameter of the target satellite and the trajectory information; acquiring an actual pointing angle of the antenna beam by correcting, based on the antenna attitude information, the theoretical pointing angle of the antenna beam; controlling, based on the actual pointing angle of the antenna beam, a receiving phased array antenna to form an antenna beam; acquiring data information of the satellite signal, and correcting an actual pointing angle of the current antenna beam; controlling a transmitting phased array antenna to form an antenna beam based on a corrected actual pointing angle; establishing a communication link and updating ephemeris data of the target satellite.

A reflective device includes a control element, and a reflective surface with a plurality of reflective elements. Each reflective element of the plurality of reflective elements includes an antenna element and a phase shifting arrangement and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the reflective surface with an adjustable phase shift. The plurality of reflective elements are connected to the control element via a cell selection bus system that interconnects the plurality of reflective elements.

A reflective device includes a control element and a reflective surface. The reflective surface includes a plurality of reflective elements, where each reflective element of the plurality of reflective elements has an antenna element and a phase shifter and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the reflective surface with an adjustable phase shift. An operating frequency of the reflective surface is configurable by at least a subset of the plurality of reflective elements being divided into a number of sub-elements that are individually switched via the control element from an activated state, in which a respective sub-element contributes to the reflection of the incident RF signal, to a deactivated state, in which the respective sub-element does not contribute to the reflection of the incident RF signal, and vice-versa.

A photovoltaic, PV, apparatus for the conversion of light into electrical energy is described. The PV apparatus has a surface to receive incident light, one or more PV elements in or at the surface, the PV element to convert light incident on the surface into electrical energy by the photovoltaic effect, and one or more reconfigurable intelligent surface, RIS, elements in or at the surface, the RIS element operating as reconfigurable intelligent surface, RIS, to direct or reflect one or more incident electromagnetic, EM, waves or one or more incident EM beams incident on the surface from an incident first direction into one or more outgoing EM waves or one or more outgoing EM beams propagating along at least one second direction.

Disclosed is a method for fast automatic calibration of a phased array based on a residual neural network. A phase setting matrix is set and an amplitude and a phase of a array far-field complex signal are measured with a network analyzer to obtain an amplitude and phase vector of the array far-field complex signal. A real part, an imaginary part, and a magnitude of the far-field measured complex signal value are separated and normalized, and mapped to RGB three-channel image data. Datasets are automatically generated according to a preset amplitude-phase error range by a simulation software, the datasets are proportionally divided into a training set and a test set to be input into the residual neural network for training to obtain a calibration model. Measured data is input into the calibration model for automatic estimation of the amplitude-phase error of the phased array.

The invention relates to the technical field of electromagnetic materials, and discloses a lossy multimode resonant metasurface unit and a multifunctional active coding wave absorber. The lossy multimode resonant metasurface unit comprises a lossy metal pattern layer, a supporting dielectric layer, an impedance matching dielectric layer and a metal ground layer which are sequentially arranged from top to bottom; the lossy metal pattern layer comprises a multi-mode resonator and a radio frequency PIN diode, the multi-mode resonator is used for realizing a plurality of resonance modes and playing a role in electromagnetic wave frequency selection, and the radio frequency PIN diode is used for playing a role of an adjustable resistor and adjusting the electromagnetic wave loss so as to realize intensity adjustment of reflected electromagnetic waves; every two adjacent multi-mode resonators are connected in a cascading mode through a radio frequency PIN diode and are combined to form a closed-loop pattern. The multifunctional electromagnetic wave absorber is simple in structure, has the constant phase scattering cancellation characteristic, and can independently regulate and control the reflection amplitude so as to solve the technical problem of an existing multifunctional electromagnetic wave absorber.

A method of designing a passive metasurface system within an environment includes receiving a three-dimensional model of the environment including one or more transmitter locations and one or more target locations, and determining one or more metasurface designs and placements to achieve a given objective. The method may also include computing a received signal strength at the one or more target locations based on the three-dimensional model of the environment, computing the received signal strength at the one or more target locations based on the three-dimensional model of the environment and the one or more metasurface designs and placements, and / or calculating ray traces and / or using machine learning to determine the received signal strength at the one or more target locations on the three-dimensional model of the environment and the one or more metasurface designs and placements.

The invention relates to a D2NNs-based terahertz phased array device and an implementation method thereof. The phased array device comprises an active modulation layer and a two-layer metasurface layer structure. The active modulation layer mainly comprises a patterned micro-nano metal electrode and an active functional material, and the optical property of the active functional material is adjusted through external voltage, so that light beam output with specific phase distribution is realized in a terahertz wave band. The metasurface layers are composed of silicon column structure arrays located on the surface of the substrate, the two metasurface layers can finely control complex electric field distribution of a specific diffraction plane, and an optical diffraction neural network architecture is constructed. The phase distribution of the metasurface layer is optimized by using gradient descent and back propagation algorithms in the neural network for each required regulation and control mode, and active regulation and control in a specific light beam direction can be realized under the driving of different voltages. According to the invention, the problems of the terahertz phased array technology in the aspects of regulation and control precision, continuity and the like are solved, and a more efficient and flexible beam regulation and control method is provided.

The invention discloses a light-operated reconfigurable metasurface for full-space terahertz wave beam regulation and control, solves the problem of how to provide ubiquitous full-space wave beam coverage for multi-user wireless communication application, and belongs to the field of artificial electromagnetic metamaterials. The super subunit comprises N super subunits which are arranged periodically, each super subunit comprises 4 * 4 identical coding units, corresponding codes are '0' and '1' respectively when illumination exists or not, and the phase response difference of the two coding units at 0.7 THz is 180 degrees. Each super subunit comprises five layers, the third layer is used for switching between reflection and transmission, when vanadium dioxide is in a medium state, the super surface is in a transmission mode, and when vanadium dioxide is in a metal state, the super surface is in a reflection mode. The first layer, the second layer, the fourth layer and the fifth layer are used for controlling the amplitude and the phase of the total-space terahertz wave, the conductivity of the photosensitive silicon pattern is changed under excitation of light with different intensities, the phase of the total-space terahertz wave beam is effectively modulated, and one-bit terahertz information coding is achieved.

The invention discloses an antenna control method and device and electronic equipment, and relates to the field of multimode cooperative communication, and the method comprises the steps: analyzing the characteristics of the environment around an antenna, generating an optimal polarization strategy in combination with a characteristic analysis result and a polarization switching prediction algorithm, transmitting a test signal through an antenna array controller, and recording a channel impulse response, time inversion processing is carried out on the channel impulse response, a time inversion signal and a phase compensation parameter are combined to generate a reverse emission signal, the reverse emission signal is reemitted, an optimal polarization strategy is combined to adjust the polarization state of each array element, a beam forming parameter set is generated, and the phase and amplitude of antenna equipment are adjusted through a controller. And monitoring signal strength and transmission efficiency, and generating a signal transmission performance data report. The antenna polarization switching method and device solve the technical problems that an antenna polarization switching algorithm cannot adapt to a dynamic electromagnetic environment and a multipath effect, the stability is insufficient, the signal strength is unstable, and the communication quality is affected in the related technology.

The invention relates to a heterogeneous honeycomb wave-absorbing structure, and belongs to the field of stealth materials. The structure is composed of a plurality of hexagonal honeycomb units comprising a plurality of different electromagnetic materials, the incident direction of electromagnetic waves mainly aims at radial incidence, large effective depth exists in the direction, and the structural layer is in uneven periodic distribution. The propagation path of electromagnetic waves in the structure is expanded, multiple reflection is easier to occur, and absorption of the electromagnetic waves is facilitated; the heterogeneous honeycomb wave-absorbing structure is divided into four layers in the radial direction, and the dielectric constant of each layer of absorbing material is in gradient change on the whole, so that the heterogeneous honeycomb wave-absorbing structure has a better impedance matching characteristic; according to the design method, the particle swarm optimization algorithm is utilized to optimize the wave-absorbing material in the optimization layer, so that the degree of freedom of the honeycomb wave-absorbing structure is increased, and the advantage of radial length is fully utilized. The heterogeneous honeycomb wave-absorbing structure provided by the invention meets impedance matching, has broadband wave-absorbing performance, and can realize good absorption of 2-18GHz electromagnetic waves, so that the heterogeneous honeycomb wave-absorbing structure has greater application potential in related fields.

The invention provides a full-space circularly polarized metasurface with identical amplitude modulation, and relates to the technical field of electromagnetic regulation and control of novel artificial electromagnetic materials. The metasurface comprises M * M metasurface units which are arranged in an array, wherein M is equal to 2, 3, 4,...; in the metasurface unit, a first metal layer comprises a first substructure and a second substructure; the first substructure is a gear and comprises four equidistantly distributed tooth roots, a pair of transverse tooth roots are equal in length, and a pair of longitudinal tooth roots are equal in length; a concentric ring is arranged in the gear ring of the first substructure; the second substructure is arranged in the concentric circular ring and comprises a double-E structure and a cross structure; openings of the double-E structure are opposite, the double-E structure is provided with two symmetry axes passing through the circle center of the gear ring, and the cross-shaped structure coincides with the two symmetry axes. The second metal layer is a metal plate etched with an annular metal groove; the first and third metal layers have the same structure. In the metasurface, a plurality of metasurface units with different polarization structures are designed, three independent functions can be realized, and the metasurface is rich in function, small in size, high in efficiency and high in integration degree.

The invention provides a multilayer metal medium metamaterial wave absorber and a 3D printing manufacturing method thereof.The multilayer metal medium metamaterial wave absorber comprises a plurality of structural units arranged in rows and columns, and each structural unit comprises a metal base and a plurality of hollow square ring-shaped metal-medium composite layers stacked up and down; the metal-medium composite layers are sequentially and vertically stacked on the metal base according to the side length sequence, and the sizes of the metal-medium composite layers are sequentially decreased from bottom to top. Compared with the prior art, the multi-layer metal medium metamaterial wave absorber has a high-efficiency wave absorbing effect in an ultra-wide frequency band; and the medium material and size can be flexibly selected, and the 3D printing additive manufacturing technology is utilized for manufacturing, so that the processing difficulty and the manufacturing cost are reduced.

The invention relates to the field of satellite communication, and discloses a parabolic antenna pointing tracking method in an inter-satellite communication scene, and the method comprises the following steps: carrying out the attitude initialization, dynamic prediction, error compensation and closed-loop control, and achieving the high-precision satellite tracking of an antenna. The method adapts to large dynamic changes of target satellites and ensures stable and reliable communication; the invention discloses a parabolic antenna pointing tracking system in an inter-satellite communication scene. The system comprises an antenna angle sensor module, a signal receiving module, a prediction module, an error compensation module and a closed-loop control module. According to the method, orbit prediction, an extrapolation algorithm, adaptive control and a closed-loop feedback mechanism are fused, and high-precision and high-robustness antenna satellite tracking is realized. The method can adapt to large dynamic change of a target satellite, reduces dependence on real-time position information, still keeps stable communication under the condition of orbit sudden change or data missing, and improves system reliability and engineering practicability.

The invention discloses a metasurface wave absorber based on a square and round multi-nested structure. The structure is composed of a top metal resonance layer, a dielectric layer and a bottom metal layer. The wave absorber is composed of a periodic unit structure, and a resonance layer of the wave absorber is composed of a split circular ring, a split square ring, a metal wafer and eight chip resistors. The split circular ring is distributed on the outermost periphery of the resonance layer, a certain distance is kept between the split circular ring and the boundary of the resonance unit, and chip resistors with the resistance value of 250 ohms are welded to the four split positions of the circular ring; the split square ring is arranged on the inner side of the circular ring and keeps a certain distance from the circular ring, and 300-ohm chip resistors are welded at four split positions; the inner side of the split circular ring is provided with a metal disc and keeps a certain distance from the square ring. The metasurface wave absorber is low in manufacturing cost and simple in structure, the electromagnetic wave absorption rate can reach 90% or above at 10.15 GHz-20.91 GHz, and the metasurface wave absorber has the very good broadband absorption characteristic.

The invention relates to the technical field of wave-absorbing materials. Specifically, the invention relates to a ferrite composite multi-walled carbon nanotube wave-absorbing material and a preparation method thereof. The invention also relates to electronic equipment containing the ferrite composite multi-walled carbon nanotube wave-absorbing material. The ferrite composite multi-walled carbon nanotube wave-absorbing material prepared by the invention comprises a ferrite magnetic material with magnetic loss and a multi-walled carbon nanotube material with electrical loss, and the composite material introduces multiple electromagnetic energy loss modes through unique structural design and component synergy, so that the wave-absorbing performance of the material is enhanced. In addition, the preparation method disclosed by the invention is simple in process, low in requirement on equipment, green and environment-friendly, and free from any toxic and harmful by-products.

The present disclosure provides a protective enclosure for electronic systems. The enclosure comprises a polymer-containing matrix and a metamaterial incorporated into the matrix. The metamaterial is tuned to a specific permittivity or permeability to absorb or reflect a particular frequency. The protective enclosure may be used to create a safe inner environment for electronic components while facilitating uninterrupted wireless communications to / from the outer environment. Additionally, the protective enclosure may be used to protect against electromagnetic interference. In particular, shielding metamaterials are configured individually or in combination to specifically shield (via reflection, absorption, etc.) against relatively wide bands of electromagnetic frequencies, while transparent metamaterials are configured specifically to pass electromagnetic signals within narrow bands of frequencies. This new approach resolves and vastly improves current shield solutions, such as Faraday cages. For example, tuned metamaterials may be configured across a variety of preconfigured frequencies, and can be constructed of lightweight materials.

A reflective device includes a control element and an array of reflective elements. Each reflective element of the array of reflective elements has an antenna element and a phase shifter and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the each reflective element with an adjustable phase shift, where different phase shifts are realized by the phase shifter channeling the RF signal into a specific one of a number of different delay lines. Each of the different delay lines includes an extension unit configured to extract a portion of a power of the RF signal channeled into the respective specific one delay line by the phase shifter and to measure or estimate the voltage, the current and / or the power of the extracted portion of the RF signal.

A waveguide probe structure, a calibration device for an antenna array and a calibration method for an antenna array are provided. The waveguide probe structure includes a waveguide coaxial converter, a tapered waveguide and a first straight waveguide. The waveguide coaxial converter is configured to transmit and receive two orthogonal linearly-polarized signals; the tapered waveguide includes a first waveguide cavity including a first waveguide port and a second waveguide port, the first waveguide port is connected to the waveguide coaxial converter, the second waveguide port is connected to the first straight waveguide, and a size of a cross section of the first waveguide cavity increases monotonically in a direction from the first waveguide port to the second waveguide port; the first straight waveguide includes a second waveguide cavity, a size of a cross section of the second waveguide cavity is equal to a size of the second waveguide port.

A lightweight absorption-transmission integrated metamaterial to electromagnetic waves with polarization stability and wide-incident-angle stability, which has a symmetric structure including at least one square frequency-selective structure-unit arranged periodically. The square frequency-selective structure-unit includes a first dielectric substrate, a metal array structure layer, a second dielectric substrate, a first carbon-based conductive film array structure layer, a third dielectric substrate, and a second carbon-based conductive film array structure layer, which are laminated in sequence with the first dielectric substrate as the bottom. A method for preparing such lightweight absorption-transmission metamaterial to electromagnetic waves is also provided.

The invention provides a 6G communication vanadium dioxide dual-function terahertz metasurface and coding metasurface, the vanadium dioxide dual-function terahertz metasurface comprises at least one metasurface unit structure, and each metasurface unit structure comprises a silicon layer, an intermediate dielectric layer and a phase change layer which are sequentially arranged from top to bottom. The silicon layer is a square silicon column with the same side length, the four corner positions of the square silicon column are corner square blocks with the same side length, the maximum length of the corner square blocks located on the same side of the square silicon column forms the structural side length of the square silicon column, and the phase change layer is a square block which is made of vanadium dioxide and has the same side length. Vanadium dioxide of the phase change layer is in a medium state, and the metasurface unit structure transmits terahertz wave beams. At high temperature, vanadium dioxide of the phase change layer is in a metal state, the metasurface unit structure reflects terahertz wave beams, and the terahertz coding metasurface is designed based on the vanadium dioxide dual-function terahertz metasurface and can be applied to the field of 6G communication.

Mechanisms for adjusting atoms of an Intelligent Reflective Surface (IRS) are provided. A method is performed by a controller configured to control an IRS comprising an array of atoms, each having an individually adjustable phase shift and gain. At least some of the atoms are provided with a measurement sensor. The method comprises obtaining, from the measurement sensors, measurements of received power of a signal transmitted from a user equipment and received by the atoms and determining, by a gradient in received power between two of the measurement sensors is larger than a threshold value, that the user equipment is in near-field of the IRS. The method comprises, as a result thereof, adjusting the phase shift of a first subset of the atoms for reflection at the IRS of subsequent communication between a network node and the user equipment when the user equipment is in the near-field of the IRS.

This invention provides a novel transceiver design to control / compensate for the spatial-wideband effect in wideband massive multiple-input multiple-output (MIMO) systems for both sensing and communication networks. The proposed design aims to divide the ultra-wideband signal into narrow band beams and control them with a simplified exhaustive search-based precoding to align the beam angle to the target direction.

The invention discloses a broadband wave-absorbing material based on an MAX-phase metasurface structure and an impedance matching optimization method of the broadband wave-absorbing material. The wave-absorbing material comprises an MAX-phase ceramic substrate and periodic metasurface structures which are arranged on the surface of the MAX-phase ceramic substrate in an array mode and composed of conductive resonance units. The resonance units are isolated through gaps, an equivalent R1L1C1 series resonance circuit is formed in an electromagnetic field, and a base body is equivalent to a parallel resistor R2. By establishing an equivalent circuit model and optimizing parameters R1, L1, C1 and R2, impedance matching of the wave-absorbing material in a target frequency band can be regulated and controlled, so that the wave-absorbing material at least has an absorption peak of which the reflection loss is less than-10 dB. According to the optimization method, electromagnetic simulation and circuit simulation are combined, optimized circuit parameters are reversely mapped into structure geometric parameters, material preparation is guided, and accurate design and broadband absorption of the wave absorbing performance are achieved.

The invention discloses a dual-frequency / broadband switchable dynamic tuning metamaterial terahertz absorber which comprises M * N terahertz absorption units of a multi-layer structure, the M * N terahertz absorption units of the multi-layer structure are distributed in an M * N two-dimensional mode, and M and N are positive integers. Each terahertz absorption unit with the multi-layer structure comprises a metal substrate, a dielectric layer and a resonance layer which are sequentially arranged from bottom to top; the dielectric layer and the metal substrate are square and have the same side length; the resonance layer comprises a single-layer graphene layer with a hollow cross, and a solid cross-shaped vanadium dioxide layer is embedded in the hollow part of the single-layer graphene layer with the hollow cross; and the appearance of the single-layer graphene layer with the hollow cross is cross-shaped. The absorber can be dynamically tuned, has the characteristic of polarization insensitivity, and can keep stable absorption in an incidence angle range of 0-60 degrees. The invention further discloses a preparation method of the dual-frequency / broadband switchable dynamic tuning metamaterial terahertz absorber.

A method includes identifying a zone blocked from line of sight (LOS) of a gNB; receiving a 3D spatial map of a first area including the zone and a second area that surrounds the zone and that is within both a coverage area and the LOS of the gNB; determining whether the second area includes a mountable surface to which a passive RF reflective metasurface is attachable; and determining whether the metasurface, if attached to the mountable surface, generates a reflection path to the zone, based on a determination that the second area includes the mountable surface and based on estimated propagation paths from the gNB to the zone. The method includes determining whether to add a metasurface to the second area based on: a determination result whether the reflection path from the metasurface attached to the mountable surface to the zone includes reflected signals satisfying a threshold bandwidth condition.

An antenna includes multiple pillbox antenna structures arranged in a circle to cover the horizon. Each pillbox antenna structures includes a reflector configured to widen the resulting beam so that neighboring pillbox antenna structures produce beams that interact to more fully cover the horizon. A feed layer may include transmit / receive modules that are configured to apply amplitude and phase modulations to input signals for each pillbox antenna structure. Amplitude and phase modulations enable constructive and destructive interference between neighboring pillbox antenna structures to enhance the resulting beam or create nulls to exclude interfering signals. Sets of pillbox antenna structures may be stacked and angularly offset to correct crossover sectors. Alternatively, or in addition, sets of pillbox antenna structures may be adapted to operate in different, distinct frequency bands.

The invention provides a beam forming system which can be applied to the fields of wireless communication systems, automatic driving, artificial intelligence and the like. And small-scale, low-power-consumption and fast-response two-dimensional beam forming can be realized. The system comprises a first optical diffraction module and an array of second optical diffraction modules, the first optical diffraction module comprising at least one input port and a plurality of output ports, each second optical diffraction module in the array of second optical diffraction modules comprising one input port and a plurality of output ports. The first optical diffraction module is used for receiving at least one path of first signal light and generating multiple paths of second signal light with different phases based on the at least one path of first signal light. Each second optical diffraction module is used for receiving one path of second signal light in the multiple paths of second signal light and generating multiple paths of third signal light with different phases based on one path of second signal light, and the multiple paths of third signal light are used for generating multiple paths of first radio frequency signals.

The invention belongs to the technical field of radar wave-absorbing materials, and discloses a double-sided wave-absorbing broadband stealth composite material and a preparation method thereof. The broadband stealth composite material with the double-sided wave absorbing function comprises a non-metal-based composite material body and at least five metamaterial layers arranged in the thickness direction of the non-metal-based composite material body at intervals. The number of the metamaterial layers is an odd number, a middle metamaterial layer is arranged in the middle of the metamaterial layers in the thickness direction, and the rest metamaterial layers are symmetrically distributed on the two sides of the middle metamaterial layer; the metamaterial layer comprises conductive pattern units which are periodically arranged; the relative dielectric constant of the nonmetal-based composite material body is not greater than 10; the double-sided wave-absorbing broadband stealth composite material does not contain a metal reflecting layer. When electromagnetic waves with the frequency of 1-18 GHz vertically enter the material, the transmissivity of the material is small (smaller than-13 dB, namely smaller than 5%), and meanwhile the material has low reflectivity in a broadband. And the preparation method is simple to operate and easy to realize large-scale production.

Embodiments described relate to a system for material detection and identification, The system may include a transmitter unit configured to transmit an RF signal at a resonance frequency for a material. The system may also include a phased array antenna assembly, the phased array antenna assembly configured to receive a response signal. The system may also include a receiver unit configured to analyze the response signal and to identify the material to a user if the presence of the material is indicated by the resonance characteristics. The techniques described herein relate to a method for material detection and identification. The method may include configuring a transmit signal for parameters to detect a material; sending the transmit signal to a phase shifter; transmitting, using a phased array antenna assembly, an RF signal at a resonance frequency for the material; processing the response signal; and outputting an identification of the material.