110 results about "Wave absorption" patented technology

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.

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.

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.

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.

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 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 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.

The utility model discloses an InAs / GaSb superlattice medium / long wave double-color infrared detector based on an nBn structure, which belongs to the technical field of optoelectronic devices and comprises a GaSb substrate, a non-doped GaSb buffer layer, a 14ML InAs / 7ML GaSb superlattice Si doped layer, a 14ML InAs / 7ML GaSb superlattice unintentional doped layer, a 4ML InAs / 7ML GaSb superlattice unintentional doped layer, a 8ML InAs / 6ML GaSb superlattice unintentional doped layer and a 8ML InAs / 6ML GaSb superlattice Si doped layer which are sequentially arranged from bottom to top. The medium / long wave absorption layers of 14ML InAs / 7ML GaSb superlattices and 8ML InAs / 6ML GaSb superlattices are combined, so that high absorption efficiency and low crosstalk of medium / long wave band response are realized, and low dark current and wide temperature range working capability are realized.

The invention relates to the technical field of magnetic wave absorption, in particular to a magnetic wave absorbing material and a preparation method and application thereof.The preparation method of the magnetic wave absorbing material comprises the steps that a multi-layer Mxene material Ti3C2Tx is mixed with a solution containing soluble Fe salt, soluble Ni salt, soluble Zn salt and a nitrogen-containing material, a hydrothermal reaction is conducted, solid is obtained through separation, and washing, drying and reduction are conducted; in the mixed solution, the mass content of the multi-layer Mxene material Ti < 3 > C < 2 > T < x > is 0.1-50 g / L, and the Fe element content is 0.1-100 mmol / L; the molar ratio of the Fe element to the Ni element is 1: (0.5-5); the molar ratio of the Fe element to the Zn element is 1: (0.1-0.8); the content of the nitrogen-containing material is 5-1000 mmol / L; the nitrogen-containing material is selected from one or more of urea and C1-C8 organic amine. The prepared magnetic wave absorbing material comprises an Mxene material and a TiO2, FeNi alloy and ZnO composite material loaded on the Mxene material, and is used for absorbing electromagnetic waves, so that the wave absorbing performance can be remarkably improved, the minimum reflection loss is low, the maximum effective absorption bandwidth is wider, and the impedance is reduced.

The invention provides a hybrid superstructure applied to low-frequency ultra-wideband electromagnetic isolation. Comprising a low-frequency antenna metal mounting plate, an air and / or medium complementary substrate integrated cascade structure, a sub-wavelength low-frequency electromagnetic wave high-resistance surface cascade structure, a sub-wavelength low-frequency electromagnetic wave polarization converter cascade structure, a low-frequency ultra-wideband metamaterial wave absorber and a low-frequency ultra-wideband transceiving antenna. Through hybrid design of complementary substrate integration, high-resistance surface cascading, polarization converter cascading and a wave absorbing structure, excellent electromagnetic isolation performance is realized in a wide frequency band; the isolation degree between the low-frequency ultra-wideband receiving and transmitting antennas is remarkably improved, and the direction finding precision of the system is improved; the adverse effect of the antenna mounting plate on the radiation characteristic of the antenna is effectively reduced, and the working performance of the antenna is improved; the structure is flexible and adjustable, structural parameters can be optimized according to specific application scenes, and different engineering requirements are met.

The application discloses a kind of based on boronene and its strain regulation and control broadband terahertz wave absorber and its design method, the designed wave absorber includes metal bottom plate and dielectric substrate silicon, sheet boronene is arranged on the surface of silicon lining, and thin dielectric layer silicon is arranged above boronene.The optical conductivity of boronene in terahertz frequency band is calculated by first principle, and then through design and simulation by finite-difference time-domain method, a broadband terahertz wave absorber is obtained.The boronene based on different uniaxial tensile strain is calculated, the designed wave absorber under different polarization directions, the working bandwidth of wave absorber is widened or reduced respectively, the wave absorber changes from isotropic to anisotropic, solves the problem that existing broadband terahertz wave absorber is difficult to actively control, simultaneously expands the terahertz working bandwidth of wave absorber, realizes the characteristics of active control in broadband terahertz wave absorption work.

The invention relates to the technical field of ocean engineering and renewable energy sources, and discloses a back wave water inlet type oscillating water column structure based on long wave reduction and energy extraction, which comprises a wave absorption main body, a support, a pile foundation and a turbine generator set with an air turbine, and further comprises an arc-shaped moving door, the two arc-shaped moving doors are connected into an interlayer of the wave absorbing body in a sliding mode, and a back water inlet matched with the two arc-shaped moving doors is formed in one side of the wave absorbing body. Water level modulation caused by the phase difference between the liquid level fluctuation of the cavity and the liquid level fluctuation outside the cavity is formed to reduce waves. According to the technical scheme, wave response optimization under different wave periods can be achieved by synchronously adjusting the size of the water inlet, the energy extraction efficiency is improved, the wave transmissivity is reduced, and the device is suitable for various layout forms of offshore and open sea areas and has the good wave adaptability and the integration characteristic of wave reduction and energy extraction.

The invention discloses a preparation method of a high-entropy LDH / MXene aerogel composite wave-absorbing material, which comprises the following steps: (1) dissolving ferric salt, cobalt salt, nickel salt, manganese salt and copper salt in water, adjusting the solution to be alkaline, and performing hydrothermal reaction at high temperature to obtain high-entropy layered double hydroxide nanoflower dispersion liquid; (2) mixing the high-entropy layered double hydroxide nanoflower dispersion liquid with the single-layer MXene dispersion liquid, fully and uniformly stirring, pre-freezing, and performing bidirectional freeze-drying to form a three-dimensional aerogel composite structure; and (3) carrying out heat treatment in an inert atmosphere to obtain the high-entropy layered double hydroxide composite MXene aerogel wave-absorbing material. The prepared composite wave-absorbing material has the characteristics of radar wave broadband absorption and infrared band low emissivity, the effective absorption bandwidth larger than 4 GHz is achieved in the range of 2-18 GHz, the minimum reflection loss is lower than-48.82 dB, and meanwhile the emissivity in an infrared window of 8-14 microns is lower than 0.35.

The invention discloses a three-dimensional multilayer wave-absorbing metamaterial compounded along a propagation direction based on antenna reciprocity, and belongs to the field of three-dimensional wave-absorbing metamaterials. The structure comprises an upper layer dielectric substrate and metal patch cross grid, a lower layer dielectric substrate and metal patch cross grid, a dielectric substrate and a metal floor from top to bottom, the lower layer unit period is 1 / 2 of the upper layer unit period, and the unit number proportion of the upper layer to the lower layer is 1: 4; the upper layer achieves 2.55-8.23 GHz wave absorption, the lower layer achieves 7.87-18 GHz wave absorption, and 2.55-15.79 GHz broadband dual-polarization wave absorption is achieved after compounding. The metamaterial adopts the antenna reciprocity theorem to simplify the design, expands the frequency band through the double-layer self-similar structure, has the advantages of light weight, good mechanical property and easiness in assembly, and can be applied to the fields of electromagnetic safety, electromagnetic compatibility and the like.

The invention discloses a periodic embedded multilayer composite frustum electromagnetic wave absorber, which belongs to the technical field of electromagnetic wave absorption and stealth, and comprises a metal plate and a wave absorbing structure, the wave-absorbing structure comprises a substrate layer and a plurality of multi-layer frustum wave-absorbing units. The substrate layer covers the metal plate; the multi-layer frustum wave absorbing unit is arranged on the substrate layer; the multi-layer frustum wave-absorbing unit is of a frustum structure formed by nesting a plurality of wave-absorbing layers from outside to inside; the substrate layer and each wave absorbing layer of the multi-layer frustum wave absorbing unit are made of electromagnetic wave absorbing materials, and the electromagnetic wave absorbing materials comprise a wave absorbing agent and a base material; in the multi-layer frustum wave-absorbing unit, the impedance of the plurality of wave-absorbing layers is gradually reduced in a gradient manner from outside to inside. The electromagnetic wave absorber has the characteristics that the structure is simple, structural parameters are easy to regulate and control, electromagnetic wave absorption is broadband and efficient, and polarization and polarization are insensitive.

The invention provides a multi-layer absorption and transmission integrated frequency selection wave absorber based on double loss layers and a preparation method, and belongs to the technical field of functional materials. The structure comprises a first loss layer, a second loss layer and two band-pass frequency selective surface layers which are sequentially stacked from top to bottom. Wherein an air layer medium with a certain thickness is arranged between every two layers. Each loss layer adopts an I-shaped derivative metal pattern and is loaded with a resistor, different-frequency impedance matching is realized through differentiated resistor configuration, and ultra-wideband wave absorption is realized; and the band-pass frequency selective surface layer adopts a cross slotted metal pattern, and forms second-order band-pass response through double-layer coupling, so that low-insertion-loss wave transmission and high-selectivity filtering are realized. The structure has the advantages of wide wave-absorbing bandwidth, low wave-transparent insertion loss, good selectivity and the like, and is suitable for an ultra-wideband radar stealth system. The working range covers the S-Ku wave band, the overall thickness is small, experiment and simulation results are consistent, and application potential is achieved in the aspects of radar stealth, electromagnetic compatibility and the like.

According to the active wave absorbing type wave maker system based on single wave height meter feedback and the control method thereof, the wave height meter is arranged at the front single point position of the wave making plate to collect the wave surface elevation signal in front of the wave making plate in real time, and the real-time position and the real-time movement speed of the wave making plate are combined; the target speed of the wave making plate after active wave absorption superposition is formed based on a built-in inverse problem solving algorithm of the industrial personal computer, the dynamic characteristics of incident waves and reflected waves are directly fused, a wave absorption instruction is generated while a traveling wave instruction is generated, and integrated control of extremely simplified hardware structure and autonomous suppression of the reflected waves is achieved. Furthermore, the spatial constraint on the setting site of the wave height meter in a traditional wave maker system is broken through by arranging the wave height meter through a single point, meanwhile, the algorithm mode for carrying out wave absorption control in the wave maker system is updated, a wave absorption instruction is directly generated in the wave forming process by utilizing an inverse problem solving algorithm, an incident wave and a reflected wave do not need to be separated, and the wave making efficiency is improved. The system structure of the wave maker is obviously simplified, and the short wave simulation precision is improved.