160 results about "Wave absorption" patented technology

The invention belongs to the technical field of electromagnetic wave functional materials, and particularly relates to a nested split ring wave-absorbing metamaterial and a preparation method thereof. The wave-absorbing metamaterial sequentially comprises an FSS metal structure layer, a dielectric layer and a metal matrix layer from top to bottom in the thickness direction, the FSS metal structure layer is formed by distributing structure units in a periodic array mode, each structure unit is composed of a double-opening outer ring shaped like a Chinese character'hui 'and a double-opening inner ring, the double-opening outer ring is a split square, and the double-opening inner ring is a hollow square. The structural units are symmetrically arranged about the diagonal line of the dielectric layer. The FSS metal structure layer designed by the invention has anisotropy, so that the polarization direction of an incident wave can be rotated by 90 degrees in a reflection mode. By means of the design, the two functions of electromagnetic wave absorption and polarization conversion are achieved at the same time, and meanwhile the effect of multiband wave absorption is achieved. Within the frequency band of 4 GHz to 18 GHz, the maximum wave-absorbing strength of the nested wave-absorbing metamaterial is as high as-30 dB, and the effective wave-absorbing bandwidth can reach 7.5 GHz.

The invention belongs to the field of optical sensing technology and food component analysis, and discloses a tea polyphenol detection method and a tea polyphenol detection device based on an infrared evanescent wave absorption spectrum. Comprising the following steps that a conical infrared optical fiber sensor is provided, the conical infrared optical fiber sensor is obtained by drawing an optical fiber with the diameter of 150-1000 microns to obtain a conical infrared optical fiber, and then the end faces of the two ends of the conical infrared optical fiber sensor are polished till the end faces of the optical fiber are free of scratches, so that the two end faces of the optical fiber are flat, smooth and bright and form mirror faces; the conical infrared optical fiber sensor is packaged in the sample pool, the upper end of the sample pool is open, and a to-be-detected sample solution is injected and fully coats the optical fiber; an 850-4000 cm <-1 > infrared light source is provided, focused infrared light enters the optical fiber and is fully coupled with the optical fiber, an infrared evanescent wave absorption spectrum is collected, and qualitative and quantitative analysis is carried out on the tea polyphenol content based on the tea polyphenol characteristic peak intensity. The method for detecting the tea polyphenol has the characteristics of rapidness, high sensitivity and low detection limit.

The invention relates to the technical field of layered products, and particularly discloses a skin material for wave-absorbing hiding and a preparation method. The skin material is of a layered structure and comprises a bionic micro-forest wave-transparent layer, a gradient transition layer, a wave-absorbing layer with a'skeleton-matrix 'dual-network structure, a reflecting layer and a heat-insulating layer which are sequentially arranged from top to bottom. A micro-cone array is arranged on the surface of the bionic micro-forest wave-transparent layer, so that broadband impedance matching is realized; the wave-absorbing layer comprises a three-dimensional ceramic skeleton and a magnetic-dielectric composite matrix filled in pores of the skeleton, and magnetic absorbents in the wave-absorbing layer are directionally arranged in the layer plane direction through a magnetic field auxiliary technology. The skin material prepared by the invention has excellent comprehensive performance of ultra-wideband wave absorption, high mechanical strength, light weight and high temperature resistance, and is particularly suitable for stealth requirements in the field of aerospace.

Embodiments of the present disclosure disclose wave-absorbing materials, device for wave-absorbing and heat-dissipating including the same, and methods of preparing the same. The device for wave-absorbing and heat-dissipating comprises: a wave-absorbing layer, the wave-absorbing layer being prepared from raw materials comprising wave-absorbing material and heat-dissipating material, the wave-absorbing layer in which the wave-absorbing material and the heat-dissipating material are in a first mass ratio; a heat-dissipating layer, the heat-dissipating layer being adjacent to the wave-absorbing layer, the raw material for preparing the heat-dissipating layer comprising wave-absorbing material and heat-dissipating material; the mass ratio of the wave-absorbing material and the heat-dissipating material in the heat-dissipating layer is a second mass ratio; the first mass ratio is greater than the second mass ratio. The solution of the present disclosure is capable of reducing cost and occupying space while safeguarding the wave-absorbing performance and heat-dissipating performance of the device for wave-absorbing and heat-dissipating.

The invention belongs to the technical field of metamaterials, and particularly relates to an adjustable wave-absorbing and reflecting integrated metamaterial structure which comprises a plurality of basic units arranged in a periodic array mode, and each basic unit comprises a resonance unit, a dielectric layer and a reflecting plate which are sequentially arranged in a stacked mode. The dielectric layer can be deformed, so that a cavity is formed between the dielectric layer and the reflecting plate or the dielectric layer is tightly attached to the reflecting plate; each resonance unit comprises four arc-shaped sections which are sequentially connected with one another, the four arc-shaped sections are arranged in a central symmetry mode, sharp corner parts extending towards the center of the resonance unit are formed at the connecting positions of the tail ends of the adjacent arc-shaped sections, and a gap is formed between every two opposite sharp corner parts. According to the invention, the reconfigurability is good, the use flexibility and deformability are very high, the state can be conveniently adjusted according to the actual use requirement so as to switch the use mode, and the 4.9 GHz-16.3 GHz broadband wave absorption or complete reflection function can be realized.

The invention relates to the field of ocean renewable energy technology utilization, and provides an oscillating water column type wave energy power generation device based on a superstructure, which comprises an oscillating water column main body, a superstructure assembly, a top shell and a power generation unit, and is characterized in that the interior of the oscillating water column main body is provided with the superstructure assembly formed by a plurality of guide plates which are arranged along the radial direction and extend in a horn shape; the oscillating water column body is internally divided into a plurality of independent oscillating water column cavities with gradually-changed sizes by combining with the partition plate assembly, an air chamber is defined by the top shell and the oscillating water column body, and airflow energy generated by water column oscillation driving is converted into electric energy through the power generation unit. The power generation unit can adopt a plurality of split type air turbines to generate power or a general type air turbine to generate power. The special fluctuation performance of the superstructure is fully exerted, efficient broadband capture and wave absorption are achieved, meanwhile, wave loads are effectively reduced, diversified integration of wave energy power generation devices is developed, sea area resources and operation and maintenance cost are saved, and negative environmental influences are reduced.

The invention provides a tunable metamaterial wave absorber, which comprises a flexible dielectric layer, a metal reflecting layer and a plurality of periodically arranged metal resonant structures, the metal resonant structures are arranged on the first surface of the flexible dielectric layer, the metal reflecting layer is arranged on the second surface of the flexible dielectric layer, and the flexible dielectric layer deforms when being stressed, so that the shape of each metal resonant structure is changed, and the area of each metal resonant structure is not changed. The shape of each metal resonance structure is changed in real time, so that the electromagnetic resonance frequency of the metamaterial wave absorber can be adjusted, wave absorbing requirements of different frequencies are met, a plurality of frequency points with the absorption rate higher than 90% exist in the frequency band of 2-18 GHz, and the metamaterial wave absorber has wide application prospects in the fields of radar stealth, wearable equipment, intelligent radio frequency tags and the like.

The invention discloses a vegetation model and plastic blind ditch combined composite wave absorbing device which comprises a square supporting amplitude modulation frame, a lifting mechanism and a vegetation model. The square supporting amplitude modulation frame comprises a bottom support, a block-shaped plastic blind ditch plate arranged on the bottom support, two guide sliding rails arranged on the two sides of the top of the block-shaped plastic blind ditch plate correspondingly, and a porous net-shaped vegetation fixing grid arranged between the two guide sliding rails. A plurality of plug-in type grooves are formed in the porous net-shaped vegetation fixing grids, vegetation strips are inserted into the plug-in type grooves to form a vegetation model, one end of the bottom support is connected with the water tank, the other end of the bottom support is connected with the lifting mechanism, and the lifting mechanism is used for adjusting the angle between the square supporting amplitude modulation frame and the water tank. The vegetation model and the plastic blind ditch plate are combined, reflection waves are reduced through double wave absorption of the vegetation model and the plastic blind ditch plate, and the wave absorption effect is improved.

This invention provides a two-dimensional wave-generating water tank with active wave absorption function driven by a voice coil motor, comprising a wave-generating device, a water tank body, and a force feedback active wave-absorbing device. The force feedback active wave-absorbing device and the wave-generating device are rigidly connected to both sides of the water tank body via brackets. Each includes a voice coil linear motor, a small processor, a magnetic grating displacement sensor, a lever amplification mechanism, and a float. The output end of the voice coil linear motor is connected to the lever amplification mechanism, which is connected to the float. The small processor is connected to the magnetic grating displacement sensor signal. The voice coil linear motor is used to apply a wave-absorbing force f to the float based on the data from the magnetic grating displacement sensor. a (t). This invention is applicable to small and medium-sized wave pools, occupies little space, and has high precision, greatly enriching the application scenarios of wave pools. It is convenient for transportation, installation, debugging, and mobile use in different scenarios, providing a foundation for subsequent classroom demonstrations, student experiments, and equipment sharing.

The invention discloses a broadband low-scattering reflection surface based on a back-loaded active microstrip network, which integrates an antenna unit with the back-loaded active microstrip network to control the response of the low-scattering reflection surface to incoming waves. Wherein the antenna unit sequentially comprises a top dielectric matching layer, a dipole patch, a first dielectric substrate, a coupling capacitor metal disc, a second dielectric substrate, a metal floor and a third dielectric substrate from top to bottom; the back-loaded active microstrip network is arranged below the third dielectric substrate; after receiving an incident wave, the antenna unit transmits the incident wave into the back-loaded active microstrip network, and after network processing, the incident wave is radiated to a free space through the antenna unit; the back-loaded active microstrip network realizes phase control of TE polarized reflected waves by adjusting the on-off state of the PIN tube, and realizes absorption of TM polarized incoming waves by loading a resistor in the middle of the short-circuit microstrip line. According to the invention, low profile and miniaturization are ensured, and wave absorbing and active scattering regulation and control functions are realized at the same time.

This invention discloses an adaptive wave-absorbing experimental device and method under a hypergravity field. The device includes: a model box with a top plate and a wave-absorbing mounting base plate installed on the underside of the top plate; a distance adjustment module including a first ball screw, a linear motion mechanism, and a first grid plate, wherein the linear motion mechanism is mounted on the wave-absorbing mounting base plate, and the first ball screw is used to move the first grid plate in the wave propagation direction through the linear motion mechanism to adjust the distance between the first grid plate and the side wall of the model box; an aperture ratio adjustment module including a second ball screw and a second grid plate, wherein the second ball screw is mounted on the first grid plate and is used to control the movement of the second grid plate perpendicular to the wave propagation direction to adjust the aperture ratio of the grid plate formed by the second grid plate and the first grid plate; and a control system for acquiring the wave height of the reflected wave and controlling the operation of the distance adjustment module and the aperture ratio adjustment module according to the wave height.

The application discloses a broadband low radar scattering cross section antenna loaded with an ATFSS, which comprises three layers of dielectric plates, namely, an upper layer plate, a middle layer plate and a lower layer plate, the upper surface and the lower surface of the upper layer plate are attached with wave absorbing structures, the lower surface of the middle layer plate is attached with a band-pass FSS structure, the upper surface of the lower layer plate is attached with a patch antenna, the lower surface of the lower layer plate is a metal ground plate, coaxial line feeding is adopted, and the upper layer plate, the middle layer plate and the lower layer plate are all air cavities. The broadband low radar scattering cross section antenna adopts the wave absorbing structure with a multi-resonance structure and the band-pass FSS structure, can realize the integrated characteristics of wave absorption and wave transmission, and the wave absorbing structure and the band-pass FSS can be loaded as a coating above the microstrip patch antenna to realize the RCS reduction in a wide frequency band under the condition of ensuring the normal radiation of the antenna.

This application discloses a numerical simulation method for wave impact suppression of structures based on SPH (Self-Pulsating Hypothesis), relating to the field of data processing technology. The method includes the following steps: determining multiple critical regions and absorbing layer particles in a preset fluid domain; calculating the critical stability of each anchor point at different times based on the position and state update of each critical particle; updating each anchor point based on the critical stability to obtain multiple final anchor points; calculating the repulsive force adjustment coefficient of each critical particle based on the repulsive force adjustment requirement of each final anchor point and the disturbance degree of the critical particles; adjusting the repulsive force of each critical particle using the repulsive force adjustment coefficient; and performing wave suppression processing on each critical particle based on the adjusted repulsive force and the absorbing layer particles. This application achieves the technical effect of completely and effectively absorbing all transmitted waves in the wave impact simulation process.

An improved viscous flow non-reflection numerical value wave water tank relates to the technical field of computational fluid mechanics and comprises a computational domain, a flow field solving module, a liquid-liquid two-phase VOF module, a wave making module, a wave absorbing module, a solid-liquid boundary processing module and a data acquisition and analysis module, and the wave making module and the wave absorbing module are used for generating target waves to absorb emergent wave energy; the liquid-liquid two-phase VOF module realizes synchronous acquisition of an internal interface and a mixing ratio; the solid-liquid boundary processing module applies a complex / moving boundary condition on the fixed grid; the data acquisition and analysis module extracts information of a free surface and an internal interface, calculates characteristic quantities such as waves and mass transfer, feeds back indexes such as a reflection coefficient and a conservation error for damping and time step self-adaptive adjustment, realizes high-precision capturing of large deformation of the free surface, synchronously obtains mass transfer and flow information in liquid, and realizes high-precision capturing of large deformation of the free surface. And the influence of the reflected wave on the calculation precision is effectively suppressed.

The application discloses a super-structure surface based on a multi-unit periodic array distribution, the super-structure surface is mainly formed by a plurality of micro-structure units arranged periodically, each micro-structure unit comprises a sub-unit A1, a sub-unit B1, a sub-unit A2 and a sub-unit B2, wherein the sub-unit A1 and the sub-unit A2 are in a central symmetric structure, and the sub-unit B1 and the sub-unit B2 are in a central symmetric structure; a wave absorber formed by the super-structure surface comprises a plurality of periodically arranged wave absorption units, each wave absorption unit comprises, from bottom to top, a conductive reflection layer, a medium interlayer, a micro-structure unit layer and a medium top layer; the wave absorber can realize more than 90% electromagnetic wave absorption rate on a frequency band of 8.31-41.75 GHz, and ensures no electromagnetic wave transmission, so that most of electromagnetic wave energy entering the wave absorber is lost under the action of medium loss and ohmic loss; meanwhile, the wave absorber has the characteristics of flexibility, easy preparation, good wave absorption effect and facilitation of integration, and is suitable for technical fields of electromagnetic shielding and microwave imaging.

The present invention discloses an assembled thin-film floating power generation breakwater and a method for using the same, which is composed of a plurality of breakwater units connected in combination. Each component of each breakwater unit can be prefabricated and then assembled on site. The prefabricated parts include a buoyancy box and an outwardly extending connecting rod, each layer of frame, each layer of film and a floating plate, and a connecting rod a. Under the action of waves, when the floating plate rises or falls, the shaft b and the speed increase gear will continue to rotate counterclockwise, thereby driving the generator to continuously generate electricity. At the same time, when the shaft a and the shaft b move horizontally back and forth in the generator box, they will also cut the magnetic lines to generate electricity. The present invention provides an assembled thin-film floating power generation breakwater, which organically combines the wave absorption and power generation functions on the basis of a composite floating breakwater. It has a good wave absorption effect and can perform stable and continuous power generation. The wave energy utilization rate is high. In addition, the structure is relatively simple and the construction and maintenance are convenient.

The electromagnetic wave absorber has a three-dimensional network structure of conductive fibers and is used for absorbing terahertz waves.

The invention provides a cascading flexible metasurface wave-absorbing composite material and a preparation method and application thereof. The composite material sequentially comprises a first flexible dielectric layer, a first coupling type active frequency selection surface layer, a second flexible dielectric layer, a flexible lossy substrate layer, a third flexible dielectric layer, a second coupling type active frequency selection surface layer and a fourth flexible dielectric layer, the unit structure of the frequency selective surface layer is any one of a square ring structure, a square structure, a square split ring structure, a square ring-square nested concentric structure or a T-shaped connection type square ring-square nested concentric structure, a traditional reflecting layer is replaced by the active frequency selective surface layer structure, the quarter-wavelength thickness limitation is broken through, and low-frequency ultra-thin wave absorption is achieved; the frequency selection characteristic of the active frequency selection surface layer is utilized to realize an electromagnetic wave absorption-screening-reabsorption cascade working mechanism, and the composite material has flexibility, thermal stability and conformality, and is suitable for the fields of electronic equipment electromagnetic compatibility management, aircraft radar stealth and the like.

The application discloses a kind of quasi-terahertz wave full absorption metasurface absorber and preparation method thereof, the structure of absorber includes: the design of silica layer, graphene multilayer structure and metal base;The structural design of top silica four pyramid;The structural design of multilayer graphene electric control simultaneously.The application uses multilayer graphene to enhance terahertz wave absorption, through the control of external bias voltage, can control the absorption intensity of low-frequency absorption band, realize certain degree of tunability.In terahertz wave band, the metasurface absorber proposed in the application can reach 96.33% average absorption in 0.5-10.0THz band.The application can effectively solve the problem that current absorber can only absorb part of terahertz wave band, open a new road for high performance of terahertz wave absorption field device.

The invention belongs to the technical field of electromagnetic wave absorbing materials, and discloses a radar wave absorbing material and a preparation method and application thereof. The radar wave absorbing material comprises a base body and a functional coating arranged on the base body, the functional coating comprises N wave absorbing coatings, the coating formed by the same wave absorbing material is defined as one wave absorbing coating, the wave absorbing coatings are named as the first wave absorbing coating, the second wave absorbing coating... the Nth wave absorbing coating respectively, and N is an integer not smaller than 2; the overlapping area of any two wave-absorbing coatings in the vertical projection direction does not exceed 10%, the N wave-absorbing coatings form a periodic array structure, and the periodic array comprises a geometric periodic array or a circuit simulation periodic array. The problems that a single wave-absorbing material coating is narrow in bandwidth and low in efficiency, electromagnetic parameters of multi-material mixed spraying are difficult to accurately regulate and control, and a regular and ordered structure cannot be formed are solved.

The present invention discloses a quantitative evaluation method for joint formation Q absorption compensation of VSP up and down waves. First, perform near-surface Q absorption compensation on surface seismic data, then perform Q absorption compensation for consolidated rock formations below the water table on the surface seismic data, perform non-zero offset correction on VSP well data and preprocess the zero-offset VSP well data. Then, use the discrete frequency shift method of the VSP down wave to obtain the Q value of the consolidated rock formation below the water table at the wellhead, perform Q absorption compensation for the consolidated rock formation below the water table of the VSP up wave, and then calculate the correlation coefficient between the VSP up wave seismic record and the surface seismic record. Finally, perform quantitative evaluation of the Q absorption compensation of surface seismic waves. The method of the present invention uses the correlation between the VSP up wave seismic record after joint Q compensation of VSP up and down waves and the surface seismic record with Q absorption compensation of underground media to quantitatively evaluate the reliability of Q absorption compensation of surface seismic waves, and solves the bottleneck problem of quantitative evaluation of Q absorption attenuation compensation of onshore surface seismic waves.

The invention relates to a divisional application with the application number of 202311635455.6, belongs to the field of heat-conducting and wave-absorbing composite materials, and discloses a preparation method of a heat-conducting and wave-absorbing composite material. A heat-conducting and wave-absorbing framework is a compound BN / MXene of boron nitride nanosheets and MXene, and the boron nitride nanosheets and the MXene are combined together through electrostatic adsorption force of positive and negative charges. A continuous 3D network prepared from the BNNS with a relatively low dielectric constant provides an effective path for heat transmission, and MXene which is uniformly dispersed but not communicated and has good wave absorbing performance is adsorbed on the basis of a skeleton of the BNNS, so that a heat-conducting and wave-absorbing integrated bifunctional composite material can be prepared. Meanwhile, the three-dimensional network structure prepared by using an ice template method has certain gaps in space, so that electromagnetic waves entering the material can be subjected to multiple reflection and multiple scattering, the transmission path of the electromagnetic waves is increased, and the wave absorbing performance of the composite material is improved. The prepared composite material shows good heat-conducting and wave-absorbing properties through tests.

The invention provides a photo-thermal regulation and control multilayer film and a preparation method thereof, and belongs to the technical field of optical films, the film comprises a fourth film layer, a third film layer, a second film layer and a first film layer which are sequentially sputtered and deposited on the surface of a graphite substrate from bottom to top; wherein the first thin film layer and the second thin film layer are used for realizing visible light structural color regulation and mechanical protection, the third thin film layer is used for realizing directional radiation of a target angle in a medium and long infrared band, and the fourth thin film layer, the third thin film layer, the second thin film layer and the first thin film layer form a Fabry-Perot resonant cavity. Therefore, the wave absorbing performance of the whole film in a medium-long infrared band can be regulated and controlled. The photo-thermal regulation and control multi-layer thin film successfully realizes organic coupling of mechanical protection, visible light structural color regulation and control, and medium and long infrared directional radiation and radiation heat dissipation.

The invention discloses a multi-band compatible camouflage metasurface based on a Fabry-Perot cavity loss matching network, the metasurface comprises a Fabry-Perot cavity at the top and a wave absorber at the bottom, and the Fabry-Perot cavity comprises a digital camouflage layer, a thermal insulation layer and a first dielectric layer which are arranged from top to bottom. The wave absorber comprises a first loss layer, a second dielectric layer, a second loss layer, a third dielectric layer and a composite material layer which are arranged from top to bottom, and the surface of the digital camouflage layer is provided with a pixelated camouflage pattern; the Fabry-Perot cavity simultaneously has self-adaptive infrared camouflage with thermal shielding and thermal compensation performance and dominates high-frequency radar wave absorption, the first loss layer and the second loss layer dominate medium-frequency radar wave absorption, and the second dielectric layer, the third dielectric layer and the composite material layer dominate low-frequency radar wave absorption. The invention further provides a preparation method of the metasurface, through the synergistic effect of the multi-layer structure, compatibility of visible light camouflage, infrared camouflage and full-band radar wave absorption is achieved, and the camouflage requirement in the complex environment is met.

The application relates to the material field and provides a layered Ti3C2T x / MXene loaded FeCo nanoparticle composite material, a preparation method and application, FeCo nanoparticles prepared by a hydrothermal method and Ti3C2T x / MXene are combined by an electrostatic self-assembly method, so that a layered composite material is obtained, FeCo nanoparticles with soft magnetic properties are loaded between layers and on the surface of the Ti3C2T x / MXene material, and the FeCo nanoparticles can adjust the dielectric property of the composite material, so that the composite material can be widely applied in the wave absorption field. The application has the advantages of simple equipment, low production cost, high production efficiency and green pollution-free. The composite material is a high-reflection and low-absorption material in a 170-220 GHz frequency band, and the absorption rate is 10-30%. In a 0.2-3 THz range, the product prepared by the method also has a wave absorption effect, and the absorption coefficient is 100-150 cm ‑1 .

The invention relates to a transparent adjustable terahertz wave absorber based on electrochemical reversible deposition and a preparation method thereof, and belongs to the field of terahertz frequency band wave absorption. The wave absorber structure is an electrochemical device clamped by an upper transparent substrate and a lower transparent substrate, and sequentially comprises a first transparent substrate, a patterned transparent conductive wave absorbing functional layer, an electrochemical regulation and control layer, a transparent conductive counter electrode layer and a second transparent substrate from top to bottom, wherein the patterned transparent conductive wave-absorbing functional layer is formed by patterning a composite film composed of a transparent conductive thin film and a dielectric layer. An external voltage is applied between the patterned transparent conductive wave-absorbing functional layer and the transparent conductive counter electrode layer to drive metal ions in the electrochemical regulation and control layer to be reversibly deposited or dissolved in the edge area of the resonance unit, so that the equivalent size of the resonance unit is changed, and the dynamic regulation and control of the terahertz wave-absorbing performance are realized. The high optical transparency is maintained while the dynamic adjustability of the terahertz wave absorbing performance is considered, and the good application prospect is achieved.

The invention discloses a cross-band multistage adjustable radar wave-absorbing structure, a design method and a preparation method, and belongs to the technical field of electromagnetic wave regulation and control. The cross-band multistage adjustable radar wave absorbing structure is prepared by adopting a photoetching process and a magnetron sputtering process, can realize absorption of a specific wave band under S / C / X wave bands, and comprises a patterned microwave absorbing layer, a chalcogenide phase change material layer, a heat bearing layer, a metal electrode layer and a flexible dielectric layer from top to bottom in sequence. The metal-insulation state of the chalcogenide phase-change material is converted by controlling the conductivity of the chalcogenide phase-change material, the Fermi level of the chalcogenide phase-change material is adjusted by controlling the chalcogenide phase-change material, multi-band absorption is adjustable, perfect absorption is achieved at multiple specific frequency points, and the chalcogenide phase-change material has the characteristic of being insensitive to a certain angle; meanwhile, the chalcogenide phase-change material layer is simple in structure, meets the large-batch production and processing requirements, expands the application of the phase-change material in the GHz field, and has the advantages of flexible design, electric adjustability, wide application range and the like.

A radio wave reflection device according to the present invention comprises: a metasurface reflector having a radio wave reflection region in which a plurality of radio wave reflection elements are arranged, and a frame region surrounding the radio wave reflection region; and a cover member disposed on a radio wave incident surface side of the metasurface reflector. The frame region includes a first region in which a wiring pattern is formed, and a second region in which a terminal section for connection to an external circuit is provided. The cover member includes a first radio wave absorption pattern provided in a region overlapping the first region, and a second radio wave absorption pattern provided in a region overlapping the second region. The size of the second radio wave absorption pattern is larger than the size of the first radio wave absorption pattern.