58 results about "Metamaterial absorber" patented technology

Wireless devices are commonly carried in fabric-based apparel. Printing metamaterial structures on fabric substrates allows for the ability to create fabric metamaterial layers. A reconfigurable RF based fabric system simply by physically removing or adding different fabric-based metamaterial layers to different regions of the apparel. The fabric-based metamaterial can be used in various filtering applications where the control of phase, reflection angle, refraction angle, polarization, absorption, and transmission of the impinged electromagnetic wave can all be manipulated. Additionally, sophisticated metamaterial systems can be created by combining different metamaterial layers separated above each other. A controllable absorber metamaterial system can be made consisting of two layers. The first layer an electronically controllable that can controllably change between a band-pass and band-reject filter in a relevant frequency band and a second absorptive layer. Vehicles with adjustable metamaterial absorber systems, integrated on the outside or inside of the RF transparent fuselage, have the ability to control their radar cross section dynamically for the purposes of evading detection or spoofing their size by looking larger or similar to vehicles of different radar cross section.

The invention discloses a metamaterial wave absorber construction method and device based on deep learning and proxy optimization. The method comprises the following steps: constructing a plurality of metamaterial structures; calling a CST-MATLAB-API interface, and controlling CST software to perform electromagnetic field simulation on the plurality of metamaterial structures to obtain a three-dimensional structure diagram of each metamaterial and S parameters under different frequencies; performing inversion on the S parameters under different frequencies to obtain the absorptivity of each metamaterial under different frequencies, converting the design layer structure of the three-dimensional structure diagram into a two-dimensional grey-scale map, taking the absorptivity and the two-dimensional grey-scale map as a group of data, and repeating the steps to obtain N groups of data; constructing a deep learning model by using the N groups of data, taking the two-dimensional grey-scale map as input and taking the corresponding group of absorptivity as output; and based on a deep learning model, taking the longest interval length continuously greater than a threshold value in a group of absorptivity as a fitness function, and utilizing a proxy optimization method to optimize the two-dimensional grey-scale map to obtain an optimal structure of the metamaterial.

A unit cell of a metamaterial absorber may be an electromagnetic wave absorber for a 5.8 GHz band or 10 GHz band. The unit cell of the metamaterial absorber may include a first metal layer including at least one concentric circular ring-shaped conductor pattern, a first intermediate layer disposed on the lower surface of the first metal layer and composed of polyimide, a resistive layer disposed on the lower surface of the first intermediate layer, a second intermediate layer disposed on the lower surface of the resistive layer and composed of polyimide, and a second metal layer disposed on the lower surface of the second intermediate layer. The resistive layer may increase the operating bandwidth of an operating frequency. The thickness of the resistive layer may be 0.05 mm to 0.15 mm. The sheet resistance of the resistive layer may be 530 Ω·sq−1 to 550 Ω·sq−1.

The invention discloses a three-dimensional water-based frequency selective absorber with convertible electromagnetic performance. The three-dimensional water-based frequency selective absorber comprises a plurality of symmetrical three-dimensional gradient structure dielectric square waveguide frequency selective surface unit structures and periodic water-based metamaterial absorber units, the three-dimensional gradient structure dielectric square waveguide frequency selective surface unit structure has broadband transmission performance with high frequency selectivity. The periodic water-based metamaterial absorber unit is packaged around the frequency selective surface unit structure and has ultra-wideband absorption performance; three transmission poles and two transmission zero points are generated by cascading three metal square rings up and down in the three-dimensional gradient structure dielectric square waveguide frequency selective surface unit structure, so that a high-frequency-selectivity broadband band-pass three-dimensional frequency selective surface is realized; by controlling the on-off of water in the periodic water-based metamaterial absorber unit, the conversion of transmission band external absorption and reflection electromagnetic characteristics is realized. According to the invention, the transmission bandwidth is expanded, the absorption frequency band is wide, the absorption rate is high, and dual polarization can be realized.

The invention discloses a broadband wide-angle polarization insensitive metamaterial wave absorber, which comprises three layers of structures, namely a microstructure unit layer, an FR-4 substrate layer and a metal bottom plate layer which are sequentially superposed from top to bottom, the whole microstructure unit layer is in axial symmetry and comprises four layers of structures, the four layers of structures sequentially comprise a rectangular metal resonance piece, four fan-shaped metal resonance pieces, a first opening metal resonance ring and a second opening metal resonance ring from inside to outside, the first opening metal resonance ring and the second opening metal resonance ring are concentric opening circular rings, and the circle centers of the first opening metal resonance ring and the second opening metal resonance ring are the centers of the rectangular metal resonance pieces. The circle centers of the four fan-shaped metal resonance sheets are located at the four corners of the rectangular metal resonance sheet respectively, the arc angles of the four fan-shaped metal resonance sheets are 90 degrees, and the edges of the four fan-shaped metal resonance sheets are located on the extension lines of the edges of the rectangular metal resonance sheet respectively. The first opening metal resonance ring and the second opening metal resonance ring are respectively provided with two openings along the transverse axis and the longitudinal axis, and the width of the openings is equal to the side length of the rectangular metal resonance piece. The wave-absorbing material has wider wave-absorbing bandwidth and better absorbing performance.

An infrared detector includes a tuning fork resonator comprising an mechanical-to-electrical transduction mechanism; a metamaterial absorber residing on at least one side of the tuning fork resonator, the metamaterial absorber comprising at least a material layer with subwavelength inclusions; and a signal processing circuit to translate the electrical signal into an amplitude of mechanical motion of the tuning fork.

The invention discloses a preparation method of a metamaterial wave absorber filled with liquid metal based on a PDMS micro-channel, and the preparation method comprises the following steps: placing a PDMS film on a three-axis displacement platform by using a built femtosecond laser processing system, regulating and controlling the Z axis of the three-axis displacement platform through a computer, enabling femtosecond laser to be concentrated on the surface of the PDMS film, and processing the PDMS micro-channel by using the femtosecond laser processing system; processing a micro-channel with a star-shaped unit structure on the surface of the PDMS film through a processing path set in a computer; spin-coating PDMS colloid on the surface of the unprocessed PDMS film, and heating to semi-cure the PDMS colloid; covering the surface of the processed PDMS film with a semi-cured PDMS film, and heating and curing; and liquid metal is injected into the micro-channel of the star-shaped unit structure, and channels at the two ends are sealed. The preparation method combines laser precise processing, micro-channel design and adjustability of liquid metal, and has remarkable advantages.

The application provides a light-weight broadband metamaterial wave-absorbing structure based on a C-shaped sandwich structure, which comprises a first composite layer, a second composite layer and a reflecting layer arranged in sequence along the electromagnetic wave propagation direction; the first composite layer comprises a sandwich structure composed of multiple wave-transparent layers and skin layers arranged alternately; the second composite layer comprises a resistance film layer and a wave-transparent dielectric layer arranged alternately; and the lowermost wave-transparent dielectric layer is provided with the reflecting layer on the lower surface. The C-shaped sandwich structure can greatly improve the wave-absorbing performance of the wave-absorbing sandwich structure in the high-frequency (Ku) band, and overcomes the shortcoming that when the skin is thicker than 0.5 mm, the wave-absorbing sandwich structure is difficult to obtain satisfactory wave-absorbing effect in the high-frequency (Ku) band.

The invention discloses a tunable graphene metamaterial sensor suitable for aerosol ink-jet printing, and belongs to the field of biomedical engineering. The tunable graphene metamaterial sensor is obtained by arranging a plurality of element atoms on a metal reflecting layer in an array; the element atom is composed of a structural layer, a substrate layer and a reflecting layer. Observed from the upper surface, element atoms of the metamaterial are composed of a circular ring structure; the circular ring structure is made of graphene; the substrate layer is a thick layer; the reflecting layer is a thin layer and is made of gold. And the meta-atoms are arranged in an array to obtain the metamaterial absorber. The interaction between the terahertz waves and the biomacromolecules is detected by matching the change of resonance frequency by utilizing the resonance absorption characteristics of the terahertz waves and the biomacromolecules, so that the detection sensitivity of the biomacromolecules is improved. By measuring the absorption characteristics of the terahertz metamaterial sensor under different biological analyte refractive indexes, enhanced detection of biological sensing is realized, and the interaction effect of terahertz waves and biological macromolecules can be detected.

This invention discloses a wide-bandwidth, wide-angle metamaterial microwave absorber covering the L, S, C, X, and Ku bands, belonging to the field of stealth technology. The unit structure of the microwave absorber includes an upper FR4 plate with three-dimensional printed high-resistivity carbon paste, a middle paper honeycomb support layer, and a bottom magnetic material attached to a metal plate. The upper FR4 plate provides microwave absorption performance at mid and high frequencies, while the bottom magnetic material provides microwave absorption performance at low frequencies. The two are fixed by the paper honeycomb of the middle support layer. By combining a three-dimensional microwave absorber with magnetic materials, this invention achieves wide-bandwidth, wide-angle microwave absorption performance. The composite microwave absorber structure constructed by this invention has high structural strength and achieves lightweight design.

The invention relates to the technical field of metamaterial absorbers, and particularly discloses a multifunctional far-infrared metamaterial absorber based on graphene and Dirac semimetal and a preparation method of the multifunctional far-infrared metamaterial absorber based on graphene and Dirac semimetal. Each metamaterial unit is of a laminated structure and sequentially comprises a Dirac semimetal layer, a graphene layer, a dielectric layer and a metal reflecting layer from top to bottom. The Dirac semimetal layer is in a rudder shape and comprises a square structure with the center being a hollow cylinder, a cylinder structure and four rectangular structures, the cylinder structure is arranged outside the square structure, the square structure and the cylinder structure are concentrically arranged, the four rectangular structures are evenly distributed outside the square structure, and the cylindrical structure is arranged outside the square structure. And the four rectangular structures are respectively and vertically intersected with the side surfaces of the square structure. The far infrared metamaterial absorber has tunable multi-peak absorption and has the broadband and narrowband dynamic switching capability, and the device structure is easy to prepare.

The invention discloses a half adder based on a vanadium dioxide and gallium arsenide metasurface, and belongs to the technical field of terahertz communication modulation. The multi-layer structure is composed of a gold substrate, a cycloolefin copolymer dielectric layer and a gold-gallium arsenide-vanadium dioxide top layer pattern. Based on the principle of a metamaterial absorber, the metasurface designed by the invention has the function of a half adder, and a new thought is provided for the design of a terahertz multifunctional logic device in the future.

The invention relates to the technical field of microfluidics, in particular to a light-heat-sound microflow pump based on a metamaterial absorber and a preparation method of the light-heat-sound microflow pump. The technical key points are as follows: a bottom metal film, a dielectric layer and a top metal structure array are sequentially formed on a substrate to prepare the metamaterial absorber chip with the plasmon photothermal effect; spin-coating the metamaterial absorber chip with polydimethylsiloxane, and carrying out drying and curing treatment to obtain the metamaterial absorber chip with a light-taking effect; the optical-thermal-acoustic micro-flow pump with the fluid driving and mixing capabilities can be obtained by irradiating the metamaterial absorber chip with the optical effect by using laser, non-contact, remote and high-precision driving of micro-fluid is realized, and the optical-thermal-acoustic micro-flow pump has the technical effects of simple structure, high driving efficiency, high response speed and no need of complex external equipment.

The utility model relates to far infrared metamaterial absorber technical field, specifically disclose a multifunctional far infrared metamaterial absorber, including a plurality of periodic array arrangement's metamaterial unit, the metamaterial unit is for the laminated structure, from top to bottom includes successively: dirac half metal layer, graphene layer, dielectric layer, metal reflection layer, the dirac half metal layer is rudder -shaped, including center hollow cylinder's square structure, cylinder structure, four rectangle structure, the cylinder structure is located the outside of square structure, square structure, cylinder structure concentric arrangement, four rectangle structures evenly distribute in the outside of square structure, four rectangle structures respectively with square structure side vertical intersection. The far infrared metamaterial absorber of the application has tunable multi-peak absorption characteristic, and has wideband and narrowband dynamic switching ability.

The invention provides a broadband metasurface wave absorber based on an oblique symmetric mosaic structure. The broadband metasurface wave absorber comprises a metal resonance layer, a dielectric layer and a metal reflecting layer which are sequentially stacked, the metal reflecting layer is formed by two inlaid structures which are arranged in an oblique symmetry mode, each inlaid structure comprises a semi-square ring body and a semi-circular ring body wrapping the outer side of the semi-square ring body, and two edge protruding edges of each semi-square ring body are connected with the corresponding semi-circular ring body; the semi-square ring body and the semi-circular ring body are both of an open structure, and the opening directions of the semi-square ring body and the semi-circular ring body are the same. According to the wave absorber disclosed by the invention, a broadband absorption effect on electromagnetic waves in a frequency band of 9.43 GHz to 14.95 GHz is realized; meanwhile, within the absorption frequency band, the absorption rate of electromagnetic waves reaches 90% or above, and the absorption rate of electromagnetic waves reaches 99% or above near two resonance peak values of 10.02 GHz and 13.56 GHz.

The application provides a chiral metamaterial absorber for multifunctional sensing and a preparation method thereof, and relates to the technical field of optics.The absorber comprises a periodically arranged three-dimensional double-layer unit structure, each unit structure sequentially comprises a Z-shaped chiral metal layer and a temperature-sensitive semiconductor layer from top to bottom; the material of the Z-shaped chiral metal layer is gold; the material of the temperature-sensitive semiconductor layer is indium antimonide, the dielectric constant of which dynamically changes with temperature, thereby realizing active regulation of circular dichroism in the terahertz wave band.The application realizes strong chiral selective absorption in the terahertz wave band through the periodic three-dimensional structure of the Z-shaped chiral metal layer and the temperature-sensitive semiconductor layer, and has high-sensitivity temperature sensing at 300K-360K and a wide-range refractive index of 1.0-2.0, and high-quality factor guarantees efficient integrated functions.

This invention proposes a multi-mode fusion, high-ratio, independent dual-band metamaterial absorber, which consists of K×K periodically arranged resonant units. Each resonant unit includes a top frustum-shaped integrated absorption structure and a bottom Helmholtz resonant cavity absorption structure. The frustum-shaped integrated absorption structure comprises a square first dielectric substrate, a square second dielectric substrate, and metal patches printed on their surfaces. The bottom Helmholtz resonant cavity includes two rectangular slots intersecting in a cross shape on the upper surface of a square cubic metal structure, and a triangular prism cavity with an isosceles triangular cross-section located inside the cubic metal structure, penetrating its front, back, left, and right sides. The rectangular slots and the triangular prism cavity are filled with dielectric material. This invention achieves dual-band absorption by combining the Helmholtz resonant mode and the frustum-shaped integrated absorption mode, and improves the absorption ratio of the dual-band absorption. It can be used in the field of decoupling high-ratio dual-band antenna arrays.

The invention relates to a radar and microwave radiometer stealth-oriented metamaterial wave absorber, which comprises a plurality of basic units in periodic array distribution, and is characterized in that each basic unit comprises four substrates and five conductive layers, the four substrates are sequentially stacked and arranged from bottom to top, and the five conductive layers are arranged among the substrates and at the two ends of the substrates; the five conducting layers are a conducting layer I, a conducting layer II, a conducting layer III, a conducting layer IV and a conducting layer V in sequence from bottom to top; the conductive layer I comprises an outer closed-loop wire and a plurality of inner closed-loop wires arranged in the outer closed-loop wire, and the peripheries of the plurality of inner closed-loop wires are connected through a connecting wire; the conductive layer II and the conductive layer V have the same structure and comprise a conductive thin film, a cross etching region arranged in the conductive thin film and a cross conductive wire located in the cross etching region, and the end part of the cross conductive wire is connected with the conductive thin film; the conductive layer III and the conductive layer IV have the same structure and are conductive films; according to the invention, the stealth facing the radar and the microwave radiometer is realized at the same time, and the absorptivity and the absorption bandwidth are high.

A selective metamaterial absorber and method for fabricating the same is disclosed. The method includes deposing a first metal layer on a first surface of a substrate and on a plurality of nanowires extending outward from the first surface of the substrate, the plurality of nanowires forming an array on the first surface, the substrate further including a second surface opposite the first surface. The first metal layer may be deposed using conformally sputtering. The substrate and the plurality of nanowires may be composed of silicon, and the first metal layer may be composed of tungsten. The first metal layer may be composed of a material having a penetration depth for a wavelength range of interest. The first metal layer may be at least three times thicker than the penetration depth.

In some implementations, a metamaterial absorber (MMA) is configured to absorb a particular range of electromagnetic radiation. The MMA includes a first metal or semiconductor material; a dielectric material disposed on the first metal or semiconductor material; and a second metal material disposed on the dielectric material. A length dimension associated with the MMA is less than or equal to 200 micrometers (μm), a width dimension associated with the MMA is less than or equal to 200 μm, and a thickness dimension associated with the MMA is less than or equal to 8 μm.

This application discloses an ultra-wideband high-isolation transceiver array, belonging to the field of antenna technology. The ultra-wideband high-isolation transceiver array embeds a dual-polarized transmitting array and a dual-polarized receiving array within a first metal cavity and a second metal cavity, respectively. The surface of the metal platform is provided with multiple metamaterial absorber groups with multi-layered multi-resonant unit structures, wherein each metamaterial absorber group is periodically arranged. The apertures of both the dual-polarized transmitting and receiving arrays are chamfered at 45° to concentrate the energy of the sidelobes of each array onto the diagonally opposite region of the array aperture, thereby improving the isolation between the dual-polarized transmitting and receiving arrays.

The invention discloses an optimization design method for a multi-band coupling metamaterial absorber structure, and relates to the technical field of metamaterial design, and the method comprises the steps: firstly, obtaining a structure parameter set and a structure parameter constraint set of an absorber basic unit; then, according to the structure parameter set and the structure parameter constraint set of the absorber basic unit, taking maximization of a first index and a second index corresponding to each target frequency as an optimization target, and utilizing a non-dominated sorting genetic algorithm to solve and obtain an optimal structure parameter value set; the first index corresponding to each target frequency refers to the reciprocal of the distance between the resonant frequency of the first resonant peak and the target frequency; the second index corresponding to each target frequency refers to the absorptivity of the first harmonic peak. According to the method, the non-dominated genetic algorithm is introduced into the metamaterial structure design, so that the difficulty of the metamaterial structure design is reduced, and the efficiency of the metamaterial structure design is improved.

The invention belongs to the technical field of metamaterials, and particularly relates to an embedded low-frequency broadband metamaterial wave absorber with double magnetic dielectric layers and application of the embedded low-frequency broadband metamaterial wave absorber. The embedded low-frequency broadband metamaterial wave absorber provided by the invention comprises a composite magnetic wave-absorbing coating and a sheet-shaped carbonyl iron magnetic wave-absorbing coating, wherein a square resistive film unit pattern layer is embedded in the sheet-shaped carbonyl iron magnetic wave-absorbing coating. The embedded low-frequency broadband metamaterial wave absorber can achieve low-frequency and broadband absorption performance under the condition of relatively low thickness, is simple in structure and easy to prepare, and has extremely high application value in practical application.

This invention discloses a broadband metamaterial absorber based on a swastika shape, comprising multiple absorbing units, each including a reflective layer; a dielectric substrate disposed on the reflective layer; and an ITO thin film resonant layer disposed on the dielectric substrate. The resonant layer has a cross-shaped structure. First extensions extend from the four ends of the resonant layer, making it swastika-shaped. Second extensions extend perpendicularly from the four first extensions, and the first and second extensions connect to form a corner structure. The circuit resonance in this invention is stable. When the surface impedance matches the free-space impedance within a wide bandwidth, electromagnetic waves of different frequencies can effectively enter the absorber and be absorbed, achieving broadband absorption. The addition of a corner structure to the resonant layer not only increases the length of the current path, thereby increasing the equivalent inductance, but also increases the propagation path length of electromagnetic waves within the metamaterial, thus broadening the absorption bandwidth.

The invention relates to the technical field of electromagnetic wave absorption, and discloses a stacked annular water-based metamaterial absorbing material with a scattering characteristic and a process thereof, the material is composed of periodically arranged unit structures, each unit structure comprises a metal substrate, a structure support body arranged on the metal substrate and a liquid absorbing medium filled in the metal substrate, the structure supporting body is integrally formed by a photosensitive resin material, and a three-dimensional water cavity structure formed by vertically stacking or combining various geometrical shapes such as a cross shape, a cylinder shape, a ring shape or an open ring shape is formed in the structure supporting body. According to the structural design, multiple resonance modes can be excited under electromagnetic wave incidence, a wide absorption frequency band is formed through coupling and superposition of the multiple resonance modes, the invention further discloses a preparation process of the structure, the structure supporting body is manufactured through the 3D printing technology, and then liquid filling and overall assembling are conducted. The problem that the bandwidth of an existing absorbing material is limited is solved, the preparation process is simple, and the cost is low.

The invention discloses a plasma-controlled absorption-adjustable metamaterial wave absorber and a preparation method thereof, and the preparation method comprises the steps: placing a metamaterial microstructure array in a sealing box, and then filling the sealing box with rare gas, the power and the frequency of a radio frequency source arranged outside the sealing box are adjusted according to the resonance frequency point of the metamaterial microstructure array, and the radio frequency source is adjusted to be in an opening or closing state so that the rare gas in the sealing box can be converted into a plasma excitation state or a plasma non-excitation state. The dielectric environment around the metamaterial microstructure array is changed through ionization coupling of the radio frequency source and the rare gas, so that the metamaterial microstructure array is rapidly and accurately switched between the reflection state and the transmission state, and meanwhile the wave absorbing performance and regulation and control flexibility of the wave absorbing material are improved.

The invention relates to a three-band metamaterial wave absorber based on artificial intelligence aided design, and belongs to the technical field of artificial electromagnetic materials. The invention aims to solve the problems of low absorption efficiency, narrow bandwidth, large thickness and sensitivity to incident wave polarization state of the traditional wave-absorbing material. The wave absorber adopts a periodically arranged array unit structure, each unit is composed of a metal resonance layer, a dielectric layer and a metal back plate from top to bottom, and the metal resonance layer comprises two coaxial closed resonance rings and four 90-degree fan-shaped metal patches which are symmetrically distributed. Structural size parameters are optimized through an artificial intelligence aided design method, the advantages of three-band high absorptivity, polarization insensitivity, ultra thinness and compactness are achieved, and the sensor has the remarkable effects of being simple in structure, low in cost and easy to manufacture and is suitable for high-performance electromagnetic wave absorption and sensing application.

This invention discloses a high-temperature resistant, high-absorption ceramic superatom and its preparation method. The high-temperature resistant, high-absorption ceramic superatom is obtained by high-precision wire cutting of millimeter-wave dielectric ceramic, the composition of which is Ba4Nd. 9.33‑ x Sm x Ti 18‑y Co y O 54‑δ In the formula, x is 3-6, y is 2-3, and δ is 1-1.5. The ceramic superatomic structure provided by this invention is simple and compact, with high temperature stability and tolerance. It is compatible with metamaterial absorbers of different millimeter-wave frequencies and can meet the application requirements of miniaturization, multi-scenario, and especially extreme scenarios of current millimeter-wave technology.

The invention discloses a switchable metamaterial absorber based on vanadium dioxide and graphene and a dynamic tuning method, and relates to the technical field of terahertz wave devices. The absorber is formed by continuously splicing periodic unit structures on a plane in an array form, and each periodic unit structure is sequentially provided with a vanadium dioxide-graphene composite metasurface, a dielectric layer and a metal reflecting layer from top to bottom; the vanadium dioxide-graphene composite metasurface is composed of a patterned graphene disc and three fan-shaped structure vanadium dioxide layers distributed around the graphene disc in the circumferential direction, the insulation-metal phase change state of vanadium dioxide and the Fermi level of graphene are regulated and controlled through external excitation, and flexible switching between broadband absorption and double-narrow-band absorption can be achieved. The absorber has the advantages of being compact in structure, easy and convenient to prepare, insensitive to polarization and the like, has excellent dynamic tuning performance and wide-angle stability, and has integration and multifunctional application prospects in the fields of terahertz communication, imaging, biosensing, environment monitoring and the like.

The invention provides an electromagnetic metamaterial wave absorber periodic unit which comprises M * N metamaterial wave absorbing units in periodic arrangement, each metamaterial wave absorbing unit comprises an absorbing layer, an air layer and a reflecting layer which are sequentially arranged from top to bottom, each absorbing layer comprises a first dielectric substrate and an absorbing unit, each absorbing unit comprises a first metal patch and a resistor patch, the first metal patch is arranged on the upper surface of the first dielectric substrate, and the resistor patch is welded on the surface of the first metal patch; the reflecting layer comprises a second dielectric substrate and a reflecting unit, the reflecting unit comprises a second metal patch, and the second metal patch is arranged on the upper surface of the second dielectric substrate. The absorbing layer can absorb electromagnetic waves of a single frequency point, the reflecting layer can reflect low-frequency-band electromagnetic waves back to the absorbing layer, and the air layer has the functions of impedance matching and bandwidth expanding. The ultra-wide wave-absorbing band wave-absorbing material is simple in structure, easy to process and low in cost, has the advantages of ultra-wide wave-absorbing band and good in-band absorbing effect, and has wide application prospects in the aspects of electromagnetic protection and radar stealth.