3000results about "Antennas" patented technology

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.

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 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.

The invention discloses an in-orbit pointing deviation correction method for a two-dimensional mechanical antenna oriented to a panel satellite spot beam. The method comprises the following steps: acquiring an azimuth angle, a pitch angle and telemetry information of an antenna pointing to a ground station in real time in an in-orbit manner; reversely calculating a gain difference value between the actual signal and the theoretical signal; judging whether the gain difference meets the pointing precision requirement or not, and if not, inversely calculating the deviation angle of the actual pointing vector and the theoretical pointing vector and the actual pointing vector; a Gauss-Newton method is adopted to solve an optimal theoretical pointing vector; resolving an installation matrix pointed by the matching theory and adjusting an antenna installation matrix; and repeating the steps to form a closed loop until the gain difference meets the precision requirement. According to the method, three-dimensional installation matrix correction is adopted to replace traditional zero correction, closed-loop feedback and nonlinear optimization are combined, multi-source error high-precision compensation is achieved, the engineering feasibility is high, the in-orbit multi-satellite batch correction requirement of the panel satellite is met, and the communication system reliability and the data transmission rate are remarkably improved.

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, according to aspects described herein, a reconfigurable intelligent surface (RIS) can receive a configuration message comprising an indication to reduce a gain of at least a portion of a reflection beam. The RIS can generating reflection coefficients for meta-elements of the RIS based on the configuration message. The RIS can configure the meta-elements based on the reflection coefficients. For instance, based on configuring the meta-elements, the RIS can generate or produce the reflection beam (e.g., a sensing reflection beam or an interference reflection beam) by reflecting a sensing signal received from a sensing transmitter device.

The invention discloses a multifunctional broadband metamaterial structure with a polarization independent characteristic and a control method. The structure has a switchable tri-state function and a complete polarization operation capability irrelevant to polarization. By introducing the guide circuit design, three different electromagnetic energy regulation and control modes of second-order filtering, broadband absorption and multi-reflection shielding are efficiently integrated in the same structure, the real broadband performance in the band is realized, and meanwhile, the higher reflection efficiency outside the band is kept. Different from a traditional method which depends on a broadband lossless reflecting layer to expand the transmission bandwidth of an absorption structure, the three arrays are considered as an integral operating system, support three-state switching operation and have real broadband and efficient behaviors.

Disclosed are techniques for communication. In an aspect, a wireless node (e.g., UE or BS) measures a first TOA of a first SRS-P from a UE, a second TOA of a reflection of a second SRS-P from the UE off of a first RIS, and a third TOA of a reflection of a third SRS-P from the UE off of a second RIS. The UE transmits, to a position estimation entity, measurement information based on the first, second and third TOAs. The position estimation entity determines a positioning estimate of the UE based at least in part on the measurement information.

The utility model discloses an intelligent communication antenna system capable of self-adapting to signal intensity, which is characterized by comprising an environment sensing module, a signal processing module and a fuzzy calculation adaptation module, and the environment sensing module, the signal processing module and the fuzzy calculation adaptation module are electrically connected. The environment sensing module comprises a signal state monitoring unit and a physical environment sensing unit; according to the utility model, through the arrangement of the environment sensing module and the fuzzy calculation adaptation module, if the attitude of the unmanned aerial vehicle changes in the driving process, the system can realize the dynamic prediction of the unmanned aerial vehicle according to fuzzy calculation in combination with the effects of multiple sensors such as a radar and a sensor, and can adjust the antenna parameters in time; according to the device, dynamic adaptation is realized through closed-loop feedback and sensing-processing-adjustment, so that the antenna signal strength can be adaptively switched when the attitude of the unmanned aerial vehicle changes quickly.

The invention discloses a bifunctional chiral metamaterial surface capable of switching polarization conversion and wave absorption, and belongs to the technical field of electromagnetic metamaterials. The method is used for solving the problem that most existing chiral super-structure surfaces cannot realize dynamic adjustability and quantitative controllability and cannot have dual functions of polarization conversion and wave absorption at the same time. The super-structure surface unit structure is composed of a graphene film layer, a gold-vanadium dioxide resonance layer, a silicon dielectric layer and a bottom-layer continuous gold film. Switching of two functions of polarization conversion and wave absorption is realized by changing the conductivity of vanadium dioxide; polarization conversion and dynamic regulation and control of the wave absorbing efficiency are realized by changing the Fermi level of the graphene; quantitative controllability of polarization conversion and a wave absorbing function is realized by controlling a function weighting function. Besides, the chiral super-structure surface also has the advantages of incident angle robustness, small thickness and small size, has double functions of broadband, and has potential application value in the fields of optical devices, communication equipment, biomedical sensors and the like.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

A beamforming front end (BFFE) for a receiver performs beamforming without needing to perform phase-shifting on each of a plurality of received signals. The BFFE comprises first variable gain amplifiers (VGAs) that respectively amplify the received signals by first gain values and second VGAs that respectively amplify the received signals by second gain values. Outputs of the first VGAs are combined into a first combined signal, and outputs of the second VGAs are combined into a second combined signal. The first and second combined signals are then used to produce an output signal corresponding to phase-shifting the received signals by amounts corresponding to the respective first and second gain values and then summing the results of the phase shifting. The output signal may be produced by mixing the first combined signal with an in-phase local oscillator signal and mixing the second combined signal with a quadrature local oscillator signal.

Certain aspects of the present disclosure provide techniques for communicating with an ad hoc intelligent reflecting surface (IRS). A method that may be performed by a user equipment includes receiving signals from a network entity via an ad hoc IRS; configuring the IRS for communications between the UE and the network entity based at least in part on the received signals; and communicating with the network entity through the IRS.

The invention discloses a high-efficiency transmission and reflection polarization conversion metasurface, which belongs to the technical field of electromagnetic wave regulation and control, and is characterized in that a plurality of transmission and polarization conversion metal structure layers arranged in an array are arranged between a first dielectric substrate and a second dielectric substrate; the top of the third dielectric substrate is correspondingly provided with a plurality of reflective polarization conversion metal structure layers which are arranged in an array; an air layer is arranged between the second dielectric substrate and the third dielectric substrate; the bottom of the first layer dielectric substrate and the top of the second layer dielectric substrate are respectively and correspondingly provided with metal grids, and a metal grid cavity is formed between every two adjacent metal grids. The metasurface has the functions of transmission polarization conversion and reflection polarization conversion, high-efficiency transmission polarization conversion can guarantee normal communication in a band, high-efficiency reflection polarization conversion can change polarization of radar detection waves, and the metasurface can be used for an embedded antenna cavity antenna housing.

The present disclosure relates to estimating a channel in a wireless communication system, and a method for operating a user equipment (UE) may a method for operating a user equipment (UE) in a wireless communication system may include receiving configuration information related to channel measurement from a base station, receiving reference signals for the channel measurement, generating channel information by using the reference signals, and transmitting the channel information to the base station. The reference signals may be transmitted from the base station, reflected in portion of reflecting surfaces included in a reflecting intelligent surface (RIS), and then received by the UE, and the configuration information may include information indicating a number or location of at least one off-reflecting surface among the reflecting surfaces.

Aspects of the subject disclosure may include, for example, determining a coherence block for each user equipment (UE) of a plurality of UEs being served by the first cell, resulting in a plurality of coherence blocks, responsive to the determining, identifying a smallest coherence block from the plurality of coherence blocks, identifying a pilot sequence length based on the smallest coherence block, determining a plurality of orthogonal pilot sequences based on the identifying the pilot sequence length, designating, from the plurality of orthogonal pilot sequences, a first group of orthogonal pilot sequences for use in the first cell, and distributing, to each neighboring cell of a plurality of neighboring cells adjacent to the first cell, a respective group of orthogonal pilot sequences from a remainder of the plurality of orthogonal pilot sequences, to prevent pilot contamination between the first cell and the plurality of neighboring cells. Other embodiments are disclosed.

The invention belongs to the technical field of nano materials, and relates to a carbon thermal reduction driven high-entropy oxide metastable-state material and a preparation method and application thereof.The preparation method comprises the steps that S1, carbon and soluble metal salt are dissolved in a solvent for ultrasonic treatment, and a metal salt solution and a carbon suspension are obtained; s2, adding a metal salt solution into the carbon suspension, adding strong base, and stirring to obtain a coprecipitation polymer; s3, re-dispersing the coprecipitation polymer in the solvent, adding extra ferric salt and urea, mixing and stirring, and freeze-drying the mixed solution to obtain precursor powder; s4, performing staged annealing treatment on the precursor powder under low oxygen partial pressure to obtain a carbon-loaded high-entropy oxide metastable-state material; the prepared high-entropy oxide metastable-state material is of an alloy phase and high-entropy oxide double-phase coupling structure, the polarization loss of electromagnetic waves is enhanced through a heterogeneous interface, and the high-entropy oxide metastable-state material has the advantages of being excellent in impedance matching and wide in electromagnetic wave absorbing bandwidth and can be widely applied to the fields of industrial electronics, medical communication and military stealth.

A reflection characteristic analysis device analyzes reflection characteristics of a reconfigurable intelligent surface (RIS: Reconfigurable Intelligent Surface). The reflection characteristic analysis device includes a ray trace calculation unit and an electromagnetic field analysis unit. The ray trace calculation unit calculates an incident angle of an electromagnetic wave incident on the reconfigurable intelligent surface by a ray-tracing method. The electromagnetic field analysis unit acquires the incident angle calculated by the ray trace calculation unit, and calculates, based on an electromagnetic field analysis, the reflection characteristics obtained when the electromagnetic wave enters the reconfigurable intelligent surface at the incident angle.

A broadband low-transmittance and high-absorption wave absorption and transmission integrated frequency selection surface comprises three wave absorption layers and two wave transmission layers which are sequentially stacked from top to bottom, and the three wave absorption layers are sequentially divided into an upper wave absorption layer, a middle wave absorption layer and a lower wave absorption layer from top to bottom; the two wave-transparent layers are sequentially divided into an upper wave-transparent layer and a lower wave-transparent layer from top to bottom; the multi-layer composite structure design is adopted, collaborative optimization of the wave absorbing performance and the wave transmitting performance is achieved by combining the two wave transmitting layers on the lower portion and the three wave absorbing layers on the upper portion, through organic combination of the upper layer structure and the lower layer structure, dual performance improvement of broadband wave absorbing and broadband wave transmitting is achieved, and a transition zone between a wave absorbing zone and a wave transmitting zone is greatly reduced.

A working mode indicating method and apparatus and a device are provided. The method includes: receiving first information sent by a network side device, where the first information indicates an RIS working mode or a relay working mode.

The technology described herein is directed towards a metasurface (reconfigurable intelligent surface) that can be used to redirect signals to and from non-terrestrial network satellites. The metasurface can be passive, and provide signal array gain with respect to indoor user equipment sending and receiving signals to and from the network satellites. The metasurface can be portable for use in various scenarios. Further, the metasurface can be configured to operate in a transmission mode, in which incoming signal is passed through the metasurface, or can be reconfigured to operate in a reflection mode, in which incoming signal is reflected by the metasurface. Different phase shifts of the metasurface's unit cells result in array gain through constructive interference, by refraction in the transmission mode, or reflection in the reflection mode. The presence or absence of a removable back plane determines the transmission or reflection operating mode of the metasurface.

A radio system is used for adaptive digital beamforming in a phased antenna-array. The radio system scales with large numbers of antenna elements in a phased array. The radio system uses a distributed computing method that is inherently scalable with large numbers of the antenna elements. The radio system includes a digital beamformer. The digital beamformer is an analog combiner, digital beamformer. The digital beamformer includes element processing hardware (EPH) which perform the distributed computing.

This invention discloses an adaptive wave-absorbing and flow-guiding device for aero-engines, comprising a casing made of wave-absorbing composite material, a wave-absorbing inner ring concentrically arranged with the casing, multiple adjustable wave-absorbing blades distributed circumferentially along the casing, a conical fairing disposed at the leading edge of the wave-absorbing inner ring, and an actuation mechanism. The adjustable wave-absorbing blades include an adjustable leading edge made of metal and an adjustable trailing portion made of wave-absorbing composite material. The leading edge of the adjustable wave-absorbing blade is fixedly disposed between the casing and the wave-absorbing inner ring, while the trailing portion is movably disposed between the casing and the wave-absorbing inner ring. The actuation mechanism is used to adjust the angle between the trailing portion of the adjustable wave-absorbing blade and the incoming flow. This adaptive wave-absorbing and flow-guiding device for aero-engines achieves the dual functions of regulating the inlet airflow and wave-absorbing efficiency, reducing the complexity of the aero-engine system and thus improving its operational reliability.

An antenna includes a supporting layer and a reflection element disposed on the supporting layer configured to reflect an incident wave with a respective reflection phase, the reflection element extending perpendicularly from the supporting layer at a height configured to achieve the respective reflection phase, and both the supporting layer and the reflection element being formed with an all-dielectric material. The antenna is not susceptible to metallic corrosion and has flexible design freedom. It is in a simple and compact structure for providing complete reflection and phase adjustment simultaneously. The simple structure of the antenna enables it to be manufactured in an efficient and cost-effective manner.

The embodiment of the invention provides a multi-tone signal sending method and device. The method comprises the steps that a first multi-tone signal is generated, the first multi-tone signal comprises N single-tone signals, the amplitude value of each single-tone signal is the same, the initial phases of at least two single-tone signals in the N single-tone signals are the same, or the absolute values of the initial phases of at least two single-tone signals in the N single-tone signals are the same, and N is an integer larger than or equal to 2; and sending the first multi-tone signal. According to the method disclosed by the invention, the average power of multi-tone signal transmission can be improved, and the transmission distance or the coverage range of the multi-tone signal can be further improved.

The invention discloses a preparation method of a high-temperature-resistant wave-absorbing honeycomb sandwich structure in the technical field of wave-absorbing materials, which comprises the following steps: synthesizing a transition metal modified polycarbosilane precursor under the protection of inert gas, and performing high-temperature cracking to obtain a magnetic silicon carbide wave-absorbing agent; blending and grinding the wave-absorbing agent and high-temperature-resistant resin to prepare a wave-absorbing glue solution; after a honeycomb core material is formed by adopting inorganic fiber cloth, a wave-absorbing glue solution is loaded through a repeated dipping-drying process, and the high-temperature-resistant wave-absorbing honeycomb is obtained through gradient heat treatment. And finally, compounding and curing with the wave-transparent skin and the carbon fiber composite material through a high-temperature-resistant adhesive film. The sandwich structure is prepared on the basis of the composite material, and the magnetic silicon carbide wave-absorbing agent has the characteristics of high temperature resistance, low density, oxidation resistance and adjustable dielectric property; the phthalocyanine resin matrix is adopted, so that excellent formability and high-temperature stability are guaranteed; honeycomb nodes are sewn and reinforced by silicon carbide fibers, so that the problem of node cracking in a high-temperature environment is solved.

The invention provides an unmanned aerial vehicle covert communication method and system supported by a movable antenna, and the method comprises the steps: calculating the maximum communication rate of a legal user under the support of the movable antenna according to a communication scene of the movable antenna; according to a movable antenna communication scene, calculating a minimum detection error rate under multi-illegal-guard cooperative detection; based on the maximum communication rate and the minimum detection error rate, a joint optimization problem of time slot segmentation, beam forming, unmanned aerial vehicle trajectory and movable antenna position is established, and the optimization objective is to maximize the minimum throughput of legal users under the condition of satisfying covert communication constraints; an iterative algorithm based on block coordinate descent and continuous convex approximation is adopted to obtain optimized time slot segmentation, beam forming, unmanned aerial vehicle trajectory and movable antenna position parameters, and the parameters are applied to covert communication of the unmanned aerial vehicle. According to the method provided by the invention, the concealment requirement of unmanned aerial vehicle communication can be well met, and the network security is improved.

A method for determining the orientation of a tracked device uses sensor data from inertial motion units, accelerometers, and synthetic aperture radar to capture images and analyze signal patterns, determining the device's facing direction. This method, integrated with an augmented reality framework, supports real-time interactions and precise placement of virtual markers and facilitates AR collaborative, interactive gameplay, asset tracking, and security applications, enabling accurate virtual object placement and real-time monitoring.

A material having radar absorbing properties comprises a matrix material enclosing an amount of fiber. The fiber is coated by graphene and / or graphene oxide. Also disclosed is a laminated material, a sheet material, A 3D structure, a vehicle, a tubular structure, a use of a material, as well as a method of forming at least part of a product having radar absorbing properties.

The invention relates to the technical field of wave-absorbing materials, and particularly discloses a Zn-Fe-Mn oxide-hard carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: preparing pomegranate-shaped spheres through a coprecipitation-calcination method; then, uniformly dispersing the mixture in a self-made solvent composition, and curing and molding the mixture through heating treatment; and finally, carrying out annealing treatment in a high-temperature tube furnace at the temperature of 800 DEG C in an argon protective atmosphere (the flow rate is 100 sccm), so as to prepare the Zn-Fe-Mn oxide-hard carbon composite material. The composite material has a unique three-dimensional layered structure, shows excellent broadband microwave absorption characteristics, and can realize efficient electromagnetic wave attenuation. And a new way is opened up for structural design and optimization of the high-performance wave-absorbing material, and the wave-absorbing material has a wide application prospect in the application fields of advanced stealth technology and novel electromagnetic shielding.