101 results about "Metamaterial" patented technology

This invention relates to the field of novel materials, specifically a novel metamaterial exhibiting both multi-stable state and negative Poisson's ratio properties. It comprises a concave hexagonal frame, two arc-shaped beams positioned on the upper and lower sides of the frame's inner cavity, and a vertical rod. The two arc-shaped beams are fixedly connected to the upper and lower ends of the vertical rod via their respective central portions. When the structure is subjected to a vertical compressive load, the frame's diagonal bracing rotates inward, contracting and compressing the ends of the arc-shaped beams, generating a significant negative Poisson's ratio effect. This process forces the arc-shaped beams to bend and deform towards the center, accompanied by energy dissipation. When the displacement reaches a critical threshold, the arc-shaped beams buckle and overturn, switching to a steady state. This invention, through specific geometric configurations and differentiated material layouts, achieves morphological self-repair after impact and reuse under low-intensity conditions. This metamaterial can be arranged as a two-dimensional periodic array as a unit cell.

The application discloses a flexible terahertz metamaterial sensor and a preparation method thereof, which comprises, from top to bottom, a reinforcing layer, a carbon nanotube film layer and a polymer substrate layer; the reinforcing layer is composed of a graphene and zinc oxide composite material; the reinforcing layer and the carbon nanotube film layer are consistent in shape and are both periodic strip structures. The super material sensor is based on the synergistic effect of a ternary system of zinc oxide / graphene / carbon nanotube, wherein zinc oxide nanoparticles grow directionally on a graphene sheet through a Zn-O-C bond, and a carbon nanotube film constructs a three-dimensional conductive network, thus solving the dielectric loss problem of a traditional noble metal-based sensor structure. The phonon resonance characteristics of zinc oxide are coupled with graphene plasmons, a high-efficiency charge transfer channel is formed at a heterojunction interface, and the conductivity and terahertz transmission efficiency are improved.

The application provides a single-layer three-passband terahertz filter metamaterial, which comprises a metamaterial sheet layer and a plurality of artificial microstructures arranged in an array in the metamaterial sheet layer, each artificial microstructure and a corresponding part of the metamaterial sheet layer are defined as a metamaterial unit together, each metamaterial sheet layer can be regarded as being arranged by the array of the metamaterial units, when electromagnetic waves enter the metamaterial, the artificial microstructures are coupled to enable the metamaterial to reflect electromagnetic waves of other frequencies by reflecting terahertz wave bands of three specific frequency ranges, namely, the metamaterial is equivalent to a three-passband terahertz filter, and the application demand of different terahertz frequency bands can be met; in addition, compared with traditional metal-dielectric and metal-dielectric-metal filter metamaterials, the metamaterial composed of only a single metamaterial sheet layer has the advantages of light weight, low price and easy processing, the metamaterial can greatly reduce the processing difficulty of designing and processing terahertz devices, and is beneficial to the development of terahertz technology.

This invention discloses a Litzized magnetic negative metamaterial structure and design method, relating to the field of wireless power transmission in implantable devices. The structure consists of three square printed circuit boards (PCBs), arranged from top to bottom as a top-layer metal spiral, a middle-layer metal spiral, and a surface-mount capacitor. The top and middle layers are connected by vias, with multiple parallel metal spirals wound sequentially from the inside out in an alternating manner to achieve planar Litzized wiring, reducing AC losses. The bottom layer connects the two ends of the metal coil to the surface-mount capacitor through vias, used to adjust the operating frequency and permeability. A Litzized magnetic negative metamaterial design method is also proposed, including S1: presetting the basic parameters of the receiving and transmitting coils and the metamaterial; S2: optimizing the optimal number of turns; S3: selecting a relatively optimal range of strand counts; and S4: optimizing the number of split strands. This application provides a Litzized magnetic negative metamaterial structure and design method for implantable devices that can effectively reduce metamaterial AC losses and improve magnetic focusing capabilities.

This invention relates to the field of electronic digital data processing technology, specifically to a simulation optimization method for bandgap design of metamaterial steel-concrete composite columns based on the finite element method. The method includes: determining the initial material modification amount and the target bandgap by utilizing the bandgap data modification amount affecting the target bandgap performance data during previous target material parameter modifications, and then determining the target material parameter modification amount for the current operation; iteratively modifying the material parameter formula and the current target bandgap using the target material modification amount, and determining the overlapping frequency range between the current target bandgap and the significant energy distribution frequency range in the seismic azimuth; using the overlapping frequency range to determine the degree of conformity of the material parameter formula to the target steel-concrete composite column, and obtaining the target material parameter formula based on the degree of conformity. Through the technical solution of this invention, the resistance of metamaterial steel-concrete composite columns to dynamic loads such as earthquakes and wind vibrations is significantly enhanced.

The application relates to a two-stage refractive index gradient mode spot converter based on a metamaterial and a preparation method thereof, and belongs to the technical field of silicon light, wherein the converter comprises a silicon substrate, a buried oxygen layer located on the silicon substrate, a subwavelength grating waveguide structure and a solid waveguide structure located on the buried oxygen layer, and a gradient refractive index upper cladding layer located on the subwavelength grating waveguide structure and the solid waveguide structure; the subwavelength grating waveguide structure and the upper cladding layer can transversely and longitudinally amplify a mode field, can effectively reduce substrate absorption loss, and can increase alignment tolerance; by designing a subwavelength grating duty cycle and an upper cladding layer two-material duty cycle, the refractive index is gradually changed along the light propagation direction, the distribution of light field energy is better controlled, the light field is gradually expanded and adapted in space, the mode mismatch problem can be effectively avoided, and the design freedom is enhanced.

This invention relates to a base station antenna, comprising: a reflector; a first column of first radiating elements, including a plurality of first radiating elements arranged longitudinally; a second column of first radiating elements, including a plurality of first radiating elements arranged longitudinally; and at least one first decoupling metamaterial element located between the first and second columns, the first decoupling metamaterial element being mounted after the radiators of the first radiating elements and configured to at least partially reduce the coupling between the first and second columns, the main surface of the first decoupling metamaterial element being substantially parallel to the main surface of the reflector, wherein the first radiating elements are configured to operate within a first frequency band. Furthermore, this invention also relates to a multi-band antenna.

A three-dimensional isotropic metamaterial is formed by gathering a plurality of metamaterial atoms having a three-dimensional structure with a minimum thickness of 1 μm or more in a transparent resin.

The application discloses a movable membrane-shaped metamaterial sound barrier, which comprises a thin film noise reduction unit and a structure fixing unit for arranging and fixing the thin film noise reduction unit, wherein the thin film noise reduction unit comprises a microporous membrane, a first cavity, a first sound insulation layer, a second cavity and a second sound insulation layer arranged along the sound wave propagation direction, and the microporous membrane is provided with a plurality of micropores for absorbing sound waves; when sound waves enter the first cavity through the microporous membrane, the micropores and the first cavity are used for preliminary noise reduction to reduce reflected sound generated by the sound waves; the sound energy of the transmitted sound waves is reduced through the first sound insulation layer and the second sound insulation layer; and the sound energy of the transmitted sound waves is further reduced through the second cavity. The application further provides an installation method. The sound barrier provided by the application is convenient to disassemble and assemble and has the effects of sound insulation and sound absorption, so that the noise pollution of construction equipment in a construction site can be effectively reduced.

The application provides a surface plasmon photolithography device and a preparation method for improving imaging aspect ratio, which can be applied to the fields of integrated circuit manufacturing and photolithography technology. The surface plasmon photolithography device comprises a metal reflection layer, an optical metamaterial photoresist layer and a mask layer which are sequentially stacked from bottom to top; wherein the optical metamaterial photoresist layer comprises a photoresist and a metal nanoparticle array embedded in the photoresist, the metal nanoparticle array comprises at least one metal nanoparticle layer, and the metal nanoparticle layer is composed of metal nanoparticles arranged periodically; the metal nanoparticle layer is arranged in parallel to the mask layer, wherein when the metal nanoparticle layer comprises a plurality of metal nanoparticle layers, the different metal nanoparticle layers are located in different planes. The application further provides a preparation method of the surface plasmon photolithography device for improving imaging aspect ratio.

This invention relates to a full-frequency vibration reduction design method for metamaterial pipelines based on multiple band gaps, comprising: establishing an equivalent mechanical model of the target pipeline; periodically arranging elastic supports on the target pipeline to induce the formation of a zero-frequency band gap and a Bragg band gap, coupling the equivalent support stiffness of the elastic supports with the equivalent mechanical model of the pipeline to construct a first band gap calculation model; periodically arranging local resonant vibration absorbers on the target pipeline to form a local resonant band gap, coupling the equivalent stiffness and equivalent mass of the local resonant vibration absorbers into the first band gap calculation model to obtain a second band gap calculation model; constructing a system finite structure dynamic vibration calculation model with a second assembly as the analysis object; constructing a vibration transmissibility index, and using the system finite structure dynamic vibration calculation model as a fitness evaluation tool for a genetic algorithm to perform non-periodic optimization of the elastic support positions, solving for the optimal arrangement position of the elastic supports with the largest bandwidth of the zero-frequency band gap.

The application discloses a radiation cooling metamaterial capable of color display through polarization control, realizes diversified color display and high-efficiency cooling performance, and is composed of two parts, wherein the upper layer is an infrared emitter composed of a silicon dioxide cone and a titanium dioxide / silicon dioxide / PDMS multilayer film, has high emissivity in the atmospheric window of 8-13 microns, and realizes the cooling function; the lower layer is a visible light selective reflector composed of a silver / silicon dioxide multilayer elliptical cylinder and a silver layer, has high visible light reflectivity, and realizes polarization-controllable color display. The design can realize the adjustment of color display in various ways through the adjustment of the structure and the polarization angle, and the average emissivity in the atmospheric window reaches 96.62%, thereby realizing good cooling function. The radiation cooling metamaterial capable of polarization-controllable color display without additional energy source has a wide range of applications and can be effectively applied in the fields of energy-saving buildings, electronic equipment, personal thermal management and the like.

This invention discloses a design and manufacturing method for a uniform cross-section explosive load simulator based on gradient elastic metamaterials, relating to the field of impact loading. Addressing the problems of high cost per use and the susceptibility of variable cross-section elastic rods to local buckling instability under high-speed impact leading to waveform distortion in existing simulators, this invention, while maintaining the macroscopic uniform cross-section shape of the simulator, derives the ideal wave impedance gradient required to achieve the target explosive load based on the one-dimensional elastic wave propagation inverse design theory; establishes the mapping relationship between the relative density of a three-period minimal surface (TPMS) metamaterial unit cell and its equivalent mechanical parameters, and inversely solves the spatial relative density distribution function; extracts the waveform through dynamic impact finite element simulation, and introduces an impedance gradient correction factor to perform nonlinear iterative correction of the density function, obtaining a final three-dimensional metamaterial geometric model that accurately matches the waveform, and uses a flexible polymer material for additive manufacturing. This invention achieves the purely elastic, non-destructive, and reusable simulator, perfectly adapting to the stable firing of light gas cannons, and exhibiting excellent anti-instability capability and waveform fidelity under strong dynamic loads.

A metamaterial structure with a gradient distribution of material properties, its implementation method, and system are disclosed. The structure comprises a metamaterial structural configuration and a gradient distribution of material properties within the solid region of the structural configuration. The implementation method includes: determining overall functional performance targets, local service response characteristics, and a design domain; designing an initial metamaterial structural configuration that satisfies or approximates the overall functional performance targets under the assumption of homogeneous material properties; optimizing and adjusting the gradient distribution of material properties within the solid region based on the response results, while maintaining the basic spatial distribution of the initial metamaterial structural configuration, thereby improving the local service response characteristics and keeping the overall functional performance targets within the allowable deviation range; and obtaining a metamaterial structure with the target gradient distribution of material properties. This invention can improve local service response and enhance the engineering applicability of the structure while ensuring overall functional performance.

The application discloses a kind of broadband power dividers based on super material unit, it is related to power divider technical field, including coupling microstrip line and rectangular dielectric substrate, wherein coupling microstrip line is T-shaped distribution on dielectric substrate, it is characterized in that, further include multiple cross square super material units;The dielectric substrate is equipped with power division input interface, first power division output interface and second power division output interface;The super material unit is symmetrically distributed in the left and right sides of coupling microstrip line;The dielectric substrate is equipped with power division input interface, first power division output interface and second power division output interface and is respectively connected with the three end portions of the T-shaped coupling microstrip line.This application is on the basis of guaranteeing the working bandwidth of power divider, by adding super material to the miniaturization design of broadband power divider, with the advantages and beneficial effects of reducing the volume of power divider, reducing transmission line loss.

The application relates to a ceramic wave-absorbing metamaterial and a preparation method thereof, which comprises at least three layers of ceramic base loss unit layers, ceramic base impedance regulation unit layers and metal mesh layers which are alternately stacked; the ceramic base loss unit layer comprises a ceramic matrix A and wave-absorbing agent A dispersed in the ceramic matrix A, wherein the wave-absorbing agent A is composed of a composite powder of nano silicon carbide with a particle size of 50-200 nm and a nickel-zinc ferrite ceramic powder; the ceramic base impedance regulation unit layer comprises a ceramic matrix B and wave-absorbing agent B dispersed in the ceramic matrix B, wherein the wave-absorbing agent B is composed of a composite powder of barium titanate with a particle size of 100-500 nm and tin oxide. The ceramic wave-absorbing metamaterial has a reflection loss of less than or equal to -10 dB in a 1-8 GHz frequency band, and a reflection loss of less than or equal to -25 dB in an 8-18 GHz frequency band.

This invention provides a double-layer symmetrical cross-shaped metasurface element and a high-gain wide-beam metasurface reflective antenna. The antenna includes a conical horn feed and a reflective array, the reflective array being composed of multiple reflective metasurface elements. The metasurface elements employ a symmetrical double-layer cross-shaped metal patch structure with an air gap between the two patches. Continuous modulation of the reflected phase of the incident electromagnetic wave is achieved through electromagnetic coupling between the multi-layer structure. The reflective array is designed with phase compensation based on the spatial phase distribution of the feed antenna, converting the reflected wave from a spherical wave to a quasi-plane wave, thereby achieving directional radiation and extending the beam coverage. This invention features a compact structure, low loss, and can achieve synergistic optimization of high directional radiation and a wide beam under limited aperture conditions, making it suitable for applications such as emergency communications.

The application discloses a kind of metamaterial honeycomb and its preparation method and application, it is related to aramid paper honeycomb technical field.The preparation method of the metamaterial honeycomb includes: surface roughness modification is carried out to aramid paper, chromium alloy is coated, the coating thickness is gradient distribution, core strip glue is coated, laminated, press together, stretch forming, solidification, impregnation, pre-curing, curing, after reaching target density, the metamaterial honeycomb can be obtained;The chromium alloy is silicon chromium alloy or nickel chromium alloy.The method can be prepared in the wide frequency range with excellent wave-absorbing performance material, and the adhesion of wave-absorbing material and aramid paper is strong, and the application range is wider.

This invention discloses a zero-refractive-index metamaterial structure that operates with arbitrarily polarized incident waves at all angles. The structure mainly consists of multiple identical subwavelength structural units arranged periodically. Each subwavelength structural unit is a metallic regular triangular prism, with electromagnetic waves propagating along its axial direction. Each subwavelength structural unit has an air aperture penetrating it along its axial direction; the air aperture is a single connecting channel. In cross-section, the connecting channel mainly consists of a "Y"-shaped channel and three "V"-shaped channels. The zero-refractive-index metamaterial achieved by this invention exhibits zero phase accumulation characteristics, full-angle impedance matching in free space, and insensitivity to incident wave polarization, showing broad application prospects in electromagnetic stealth, metalenses, and other fields.

The application provides a radome based on broadband wave-absorbing and wave-transmitting integrated metamaterial, which comprises a wave-absorbing part and a frequency selection part, the wave-absorbing part comprises a fourth metal layer and a fifth metal layer, the fourth metal layer and the fifth metal layer comprise filter prongs and lumped resistors; the frequency selection part is located on the inner side of the wave-absorbing part, and the frequency selection part comprises a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer and a third metal layer arranged in sequence. The radome based on broadband wave-absorbing and wave-transmitting integrated metamaterial has three independent resonance points in the wave-transmitting frequency band by arranging the wave-absorbing part and the frequency selection part, and forms a radome with the band-pass filter characteristics of the third-order resonance characteristics; meanwhile, the radome can efficiently absorb electromagnetic waves in the low frequency band, effectively reduces the radar scattering cross section of the radome double war (multi-station), and improves the stealth performance; and the structural unit size of the radome metamaterial is small, the unit size is only three tenths of the working wavelength, and the radome has good angle stability.

The application provides a zero-Poisson's ratio metamaterial expansion joint device and a unit cell screening, design and manufacturing method, and relates to the technical field of bridge and road engineering. The device comprises: a zero-Poisson's ratio metamaterial geometric expansion main body composed of zero-Poisson's ratio unit cell A and zero-Poisson's ratio unit cell B in series array distribution along the driving direction; a left connecting block and a right connecting block are integrally connected with the left end and the right end of the zero-Poisson's ratio metamaterial geometric expansion main body respectively; the left connecting block and the right connecting block each independently comprise an anchoring plate, an anchoring rib body and a gradual transition area; a composite waterproof system is arranged below the zero-Poisson's ratio metamaterial geometric expansion main body and is composed of a first waterproof element and a second waterproof element; the left connecting block, the zero-Poisson's ratio metamaterial geometric expansion main body and the right connecting block are integrally formed by using 3D printing additive manufacturing technology. The application realizes decoupling control of longitudinal deformation and transverse zero deformation, and improves the durability and service life of the expansion joint.

The application discloses a micro-nano structure parameter optimization method, system, device and medium, which is applied to an outer layer radiation refrigeration metamaterial film of a cable intermediate joint explosion-proof device, and the method comprises the following steps: obtaining material parameter attributes and environmental parameters of the outer layer radiation refrigeration metamaterial film; inputting the material parameter attributes and the environmental parameters into a preset physical field coupling model to calculate Nusselt numbers and radiation refrigeration efficiencies corresponding to each sample point; constructing a response surface model with the maximum Nusselt number and the maximum radiation refrigeration efficiency as objective functions, solving the response surface model by using a multi-objective optimization algorithm, obtaining a Pareto optimal solution set, and selecting and determining target micro-nano structure parameters of the outer layer radiation refrigeration metamaterial film of the cable intermediate joint explosion-proof device from the Pareto optimal solution set. The application can realize accurate determination of the micro-nano structure parameters of the outer layer radiation refrigeration metamaterial film of the cable intermediate joint explosion-proof device.

The specification describes assemblies of rotary components in which a magnetic engagement is used as a negative incremental stiffness component and a torsion spring is used as a positive incremental stiffness component to provide new or improved meta-functionalities.

An acoustic structure according to the present invention comprises at least two cavities 1, a connection part 2 that connects adjacent cavities 1, and a volume alteration part 3 that increases or decreases the volume of at least one of the cavities 1. An increase or decrease in volume by the volume alteration part 3 changes the sound absorption characteristics of the acoustic structure. At least a portion of the acoustic structure is formed from a material that includes a metamaterial.

This invention discloses a metamaterial-based composite stealth film, its preparation method, and its applications, belonging to the field of multi-camouflage technology. The metamaterial-based composite stealth film disclosed in this invention includes an anodic aluminum oxide template and an amorphous alloy film deposited on its surface. The anodic aluminum oxide template has a nanopore array structure. In this invention, the anodic aluminum oxide template and the amorphous alloy film in the metamaterial-based composite stealth film exhibit a synergistic effect, modulating infrared radiation through the photonic bandgap effect, suppressing laser reflection through surface plasmon resonance, and generating visible light camouflage through structural color, thereby achieving multi-camouflage capabilities in visible light, laser, and infrared light.

The optical system includes a first optical element comprising a first substrate, a partial reflection coating disposed on a first surface of the first substrate, and a first metamaterial layer disposed on or adjacent to the first surface of the first substrate and having a structure that defines a continuous phase gradient along a first direction parallel to the first surface of the first substrate; and a second optical element comprising a second substrate and a second metamaterial layer disposed on or adjacent to the first surface of the second substrate and having a structure that defines a continuous phase gradient along a second direction parallel to the first surface of the first substrate, wherein at least one surface of the second optical element is curved along the second direction.

The present invention relates to an object detection system (1) comprising: an antenna device (3) including at least one antenna; a control device (2) adapted to control the antenna device (3) to transmit radio frequency detection signals (D1, D2) and to detect an object based on a radio frequency response signal received by the antenna device (3); and at least one passive reflector (10) adapted to at least partially reflect the detection signals (D1, D2), the reflector (10) comprising a metamaterial having a plurality of unit cells, the metamaterial comprising at least one dielectric substrate layer and a conductive structure layer disposed thereon, wherein the reflector (10) has a frequency-dependent reflectivity, wherein the control device (2) is adapted to detect the object based at least partially on the spectrum of the response signal. In order to provide an effective means for reliable radar-based object detection, the present invention provides at least one of the at least one reflector (10) having an absorption region (A1, A2) smaller than the frequency bandwidth of the detection signal (D1, D2), and the reflectivity of the reflector (10) decreases relative to the adjacent region in the absorption region, wherein the absorption region is within the frequency bandwidth, and the control device (2) is adapted to detect the object at least in part based on the effect of identifying the absorption region on the spectrum of the response signal.

This invention proposes an acoustic black hole metamaterial and its design method that combines load-bearing and vibration suppression. It is composed of multiple periodically arranged unit cells interconnected. Each unit cell integrates six three-dimensional acoustic black hole units formed by rotating a power-law thickness-gradient structure. Through the synergistic effect of the three-dimensional acoustic black hole units and lattice topology design, a significant elastic wave bandgap is achieved in an ultra-wide frequency range, effectively suppressing structural vibration while maintaining excellent static load-bearing capacity. This invention overcomes the inherent contradiction between vibration reduction performance and load-bearing capacity. While achieving lightweight miniaturization, it has advantages such as simple manufacturing process, compact structure, and easy integration, making it suitable for fields with high requirements for load-bearing and vibration suppression.

This invention discloses a microwave non-destructive testing device for grain moisture content. The device includes a shell, metamaterial lens antennas, a grain container, a 4.3-inch capacitive touchscreen, a coaxial cable, a near-infrared temperature probe, a microwave absorbing material plate, and a main control circuit board. The main control circuit board includes a main control chip, a 24GHz microwave transmitting circuit, and a 24GHz microwave receiving circuit. The main control circuit board is connected to symmetrical metamaterial lens antennas on both sides of the device via the coaxial cable. The device measures the change in scattering parameters between the two antennas using microwave signals, calculates the complex permittivity of the grain moisture content based on this change, and then uses a density-independent algorithm and a temperature calibration algorithm to invert the grain moisture content. The measurement results are displayed on the capacitive touchscreen. A microwave absorbing material plate is attached to the inner surface of the shell to reduce microwave reflection interference; a near-infrared temperature probe is used to quickly detect the grain temperature, reducing measurement errors caused by temperature.