299 results about "Selective surface" patented technology

The invention relates to the field of electromagnetic functional composite materials, and particularly discloses a multi-layer composite structure flexible frequency selective surface material and a preparation method thereof. The ultra-high molecular weight polymer fiber-reinforced polymer-based composite material thin-film mechanical enhanced band-pass frequency selection array sequentially comprises an acrylic acid polyvinylidene fluoride organic polymer coating environment-resistant layer, a metal oxide organic film isolation layer, an ultra-high molecular weight polymer fiber-reinforced polymer-based composite material thin-film mechanical enhanced layer, a band-pass frequency selection layer and a packaging protection layer from top to bottom, and the band-pass frequency selection layer is a hexagonal / circular ring nested band-pass frequency selection pattern array. The packaging protection layer is formed by printing a conductive coating composed of conductive filler / polymer resin matrix, and the packaging protection layer is an ink coating. The flexible frequency selective surface material has the characteristics of light weight, high strength, salt fog / rain / ultraviolet and other severe environments, frequency selective wave transmission and multiple functions, has good gas barrier property, is beneficial to maintaining the shape of an inflatable hangar made of a skin and ensuring normal operation of radar equipment, and has good practical engineering application value.

A microwave filter arrangement (100) for quantum computing applications, the filter arrangement (100) comprising a first port (113) and a second port (114). The microwave filter arrangement (100) comprises a main waveguiding structure (110) arranged between the first (113) and second (114) port, where the main waveguiding structure (110) comprises an inner conductor (111) having a circular cross-section that is surrounded by a hollow outer conductor (112) having a rectangular cross-section with two opposed long sides and two opposed short sides. The waveguiding structure (110) comprises a plurality of hollow waveguides (115) extending away from one or both of the long sides of the outer conductor, the hollow waveguides (115) comprising a dielectric material (122) and being terminated by an electromagnetically absorptive material (124).

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

The invention discloses an ultra-wideband RCS (radar cross section) reduction metasurface with mixed wave absorption and diffuse scattering and a wave-transparent window, and belongs to the technical field of electromagnetic metamaterials. The metasurface adopts a four-layer cascade structure and comprises a first layer of polarization conversion structure, a second layer of 2.5 D lossy structure, a third layer of Jerusalem cross-shaped lossy structure and a fourth layer of frequency selective surface structure. By loading a lumped resistor at a specific position and adopting a metal through hole interconnection technology, dual functions of radar cross section reduction in a 1-20GHz ultra-wideband and low insertion loss wave transmission in a 8-12GHz frequency band are realized. The structure of each layer adopts a highly symmetrical design and has the characteristic of polarization insensitivity, and meanwhile, by optimizing interlayer air gaps and dielectric material selection, the structure compactness is realized on the premise of ensuring the performance. The method has important application value in the aspect of integration of stealth equipment and a communication system.

A multi-band antenna includes a first column of radiating elements that are configured to operate in a first operating frequency band mounted on a reflecting plate; a second column of radiating elements that are configured to operate in a second operating frequency band mounted on the reflecting plate; a first fence and a second fence located on both sides of the reflecting plate that extend forward from the reflecting plate, where the first and second columns of radiating elements are arranged in between the first and second fences, the first fence and the second fence respectively comprise a frequency selective surface with a passband and a stopband, the passband covers at least the first operating frequency band, and the stopband covers at least the second operating frequency band.

The embodiment of the invention provides a design method of a wave-absorbing / wave-transmitting electrically-controlled switchable antenna housing, the structure of the antenna housing comprises an absorbing layer frequency selective surface, a dielectric layer and a wave-transmitting layer frequency selective surface from top to bottom, the absorbing layer frequency selective surface can carry out in-band loss and in-band transmission, the wave-transmitting layer can carry out in-band transmission and out-of-band reflection, and the dielectric layer can carry out in-band transmission and out-of-band reflection. The overall structure interacts to form a radar radome structure integrating absorption and transmission; a microwave network is adopted to carry out impedance analysis on the absorption and transmission radome, parameters are set to represent the characteristics of the microwave network, and meanwhile, a transmission matrix of the microwave network is analyzed through a matrix. The designed antenna housing not only has good out-of-band wave-absorbing stealth performance, but also can switch an in-band wave-transmitting state to a wave-absorbing state through electric control to realize limit stealth.

A frequency selective unit, a frequency selective surface, and an antenna base station. The frequency selective unit comprises a metal reflector plate and at least two conductive material pattern layers, wherein through holes are provided in the metal reflector plate, the at least two conductive material pattern layers run through the through holes, and there is a gap between the conductive material pattern layers and the metal reflector plate; and at least one conductive material pattern layer comprises a first transmission mode, and at least the other conductive material pattern layer comprises a second transmission mode, and in a transition band, electromagnetic waves in the two transmission modes have opposite phases and cancel each other, such that the electromagnetic waves cannot be transmitted through the frequency selective unit; moreover, an electromagnetic wave transmission zero can be generated in the transition band, and a sharp roll-off is formed at an out-of-band edge of a second band, thereby realizing high-frequency selectivity. The conductive material pattern layers are not parallel to the metal reflector plate, the transmission direction of the electromagnetic waves is parallel to the surfaces of the conductive material pattern layers, and it is not necessary to provide a metallized via hole between the at least two conductive material pattern layers to perform electrical connection, thereby simplifying the manufacturing process and processing difficulty of the frequency selective unit.

The integrated optical structure includes a frequency-selective reflecting structure disposed between a decorative cover layer and an underlying metal layer. The underlying metal layer is configured to reflect and / or absorb radio frequency electromagnetic waves transmitted by the decorative cover layer and the frequency-selective reflecting structures. Each of the frequency-selective reflecting structures includes a frequency-selective surface layer having metal elements arranged on a multilayer stack and repeated across the frequency-selective surface layer to form an array. The integrated optical structure reflects collimated incident RF electromagnetic waves having a wavelength in the range of 1.0 mm to 10 cm and incident at an incident angle at a reflection angle different from the incident angle as collimated reflected waves. For normally incident light having a first visible wavelength, the frequency-selective reflecting structure has an optical transmittance greater than 50%.

The utility model provides a waveguide antenna structure with a frequency selective surface structure and a waveguide radar, and the structure comprises a waveguide antenna which is provided with a waveguide slot array and a frequency selective surface structure; the waveguide slot array is arranged on the waveguide antenna in a penetrating manner, and the frequency selective surface structures are distributed on the peripheral side of the waveguide antenna; the frequency selective surface structure comprises surface structure units, and the frequency selective surface structure is formed by arranging a plurality of surface structure units. According to the utility model, the frequency selective surface structure absorbs reflection between the top surface of the antenna and the antenna housing and reduces distortion of a directional diagram; surface waves can be reduced, space coupling between the antennas is reduced, and the isolation between the antennas is improved; the beam directivity can be adjusted, and beam performance specific directivity can be shaped.

The invention belongs to the field of electromagnetic wave absorbing materials, and particularly relates to a thin broadband composite wave absorber based on a frequency selective surface. According to the invention, the wave-transparent layer is added in the middle of the multi-layer magnetic material, the mindset of simply stacking the same type of materials in the traditional multi-layer wave-absorbing structure is broken, and the wave-transparent layer is introduced to change the original characteristic that the impedance gradually changes in sequence; meanwhile, a magnetic wave-absorbing material, a frequency selection surface and a medium matching layer are subjected to composite design, the frequency selection surface generates an electromagnetic coupling effect at high frequency, phase and impedance conversion of electromagnetic waves in a multi-layer structure is controlled, and efficient impedance matching and electromagnetic wave energy dissipation in a broadband are achieved through electromagnetic absorption and interference cancellation; and an excellent wave absorbing effect is achieved. The total thickness of the composite wave absorber ranges from 0.064 lambda to 0.1 lambda, the-10 dB absorption bandwidth ranges from 3.3 GHz to 18 GHz, and the relative bandwidth reaches 138%; and meanwhile, the wave absorber has a wide angular domain characteristic under oblique incidence, and a novel thin broadband composite wave absorber scheme is provided.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased array with a tail end unit loaded with asymmetric dipoles. The main structure of the antenna comprises a radiation structure (I) which is composed of frequency selection surfaces which are arranged above folded dipoles and are periodically arranged, dipoles which are symmetrically arranged in a central unit and dipoles which are asymmetrically arranged in an edge unit; and the feed structure II is composed of a gradient microstrip feeder line, a metal floor and a coaxial line. According to the invention, a frequency selective surface is loaded above a folded dipole, a traditional tight coupling phased array is replaced, a heavy dielectric layer is loaded above the dipole, and a 1 * 8 one-dimensional linear array is designed. Besides, by prolonging the length of the folded dipole on the tail end array element, compared with a traditional structure, extra capacitance is introduced under the condition that the height of the array section is not changed, and the problem that the array is difficult to match at low frequency is effectively relieved.

The invention relates to a high-temperature-resistant Si3N4-based wave-absorbing material based on FSS and a preparation method thereof. The high-temperature-resistant Si3N4-based wave-absorbing material based on the FSS comprises a frequency selective surface layer, a porous silicon nitride dielectric layer and a metal substrate which are sequentially stacked from top to bottom, the frequency selective surface layer is composed of M * N FSS units which are periodically arranged in a two-dimensional plane and are in a Jerusalem cross pattern, M is larger than or equal to 8, and N is larger than or equal to 8. The high-temperature-resistant Si3N4-based wave-absorbing material based on the FSS provided by the invention can realize effective absorption of C-Ku wave band electromagnetic waves, has the characteristics of thin thickness, low reflectivity, high strength, high temperature resistance, light weight and wide frequency band, and can realize the purpose that the high-temperature-resistant Si3N4-based wave-absorbing material can be used for absorbing high-temperature-resistant Si3N4-based wave-absorbing material in a complex and severe physical environment with relatively small physical burden. And efficient, reliable and lasting absorption of broadband electromagnetic waves is realized.

The invention is suitable for the technical field of electromagnetic wave regulation and control, and provides a dual-polarization angle selection surface for suppressing antenna side lobes, which comprises a plurality of periodically arranged dual-polarization angle selection surface units, the dual-polarization angle selection surface unit comprises a first metal layer, a first dielectric substrate, PMI foam, a second dielectric substrate and a second metal layer which are sequentially stacked from top to bottom; the centers of the first metal layer, the first dielectric substrate, the PMI foam, the second dielectric substrate and the second metal layer coincide; the first metal layer and the second metal layer are of the same structure and each comprise a hexagonal gap and a gap shaped like a Chinese character'mi '. According to the invention, the in-band radiation performance can be ensured, and the antenna sidelobe can be significantly reduced.

The application belongs to the technical field of electromagnetic materials, and provides a design method and system of a conical surface tunable frequency selective surface with stable performance. According to the performance evolution law of the FSS under the conical surface conformal transformation, the FSS period shape and arrangement mode are determined. Whether the geometric parameter value of the optimized conical surface tunable frequency selective surface structure meets the set target IL value is judged. If the geometric parameter value of the optimized conical surface tunable frequency selective surface structure does not meet the set target IL value, the geometric parameter value of the conical surface tunable frequency selective surface structure is redesigned according to the insertion loss improvement strategy. The proposed curved surface TFSS design process has low IL, high conformality and wide angle domain stability.

The invention discloses an energy selection surface with a polarization conversion function, which is formed by periodically arranging a plurality of energy selection surface units with the same structure, each unit comprises a polarization conversion layer and an energy selection layer, and the polarization conversion layer is composed of two metal layers and three dielectric plate layers so as to realize the polarization conversion function; the energy selection layer is composed of two metal layers, two dielectric plate layers and an air layer so as to realize an energy selection function; the polarization conversion layer and the energy selection layer are separated by an air layer. According to the energy selection surface, through the combined action of the polarization conversion layer and the energy selection layer, the insertion loss of the energy selection surface can be lower than-1dB in a wave transmission mode in a working frequency band, and the polarization conversion efficiency exceeds 90%. In a protection mode, the energy selection surface shows a remarkable energy selection characteristic in an ultra-wideband range, the protection efficiency is superior to-20dB, and the energy selection surface is suitable for an aircraft antenna housing.

The application discloses a multi-mode absorbing frequency selective surface with adjustable wave absorbing capacity, which comprises a metal pattern layer, a first dielectric substrate, a metal back plate, a second dielectric substrate and a metal feed line layer arranged in sequence from top to bottom, wherein the metal pattern layer comprises a plurality of metal unit structures arranged in an array, each metal unit structure comprises a polygonal metal sheet located at the center of the unit, metal bands extending from the periphery of the polygonal metal sheet, and metal arms extending from the four corners of the unit, the metal arms comprise two independent metal structures, the polygonal metal sheet and the metal bands are connected to each other through a first varactor diode, the two independent metal structures are connected to each other through a second varactor diode, and the metal arms in adjacent metal unit structures jointly form a new rotating cross structure. The independent feed line network is built through the metal through hole, so that the structure is divided into two independently regulated parts, and the whole has single and double adjustable wave absorbing modes.

The utility model relates to the technical field of antenna stealth, specifically relates to a frequency selection unit and frequency selection surface for low frequency range, the frequency selection unit is spliced by first metal layer, second metal layer, third metal layer and fourth metal layer, the first metal layer is formed by MXM square metal patch, wherein 3<=M<=7 and M is odd, second metal layer is spliced by four sub metal layer units and second metal layer is central symmetry structure, the sub metal layer unit is the structure after first metal layer equal proportion reduction to one fourth, third metal layer and first metal layer structure are same and both are in diagonal position, fourth metal layer and second metal layer structure are same and both are in diagonal position, the frequency selection unit structure simple in the utility model can realize the absorption of internal fixed frequency point electromagnetic wave, and the electromagnetic wave of other frequency is completely transparent, can satisfy the frequency selection of antenna, and does not influence the use of antenna itself.

The application provides a low-frequency antenna, an antenna array and an electronic device. The low-frequency antenna comprises a dielectric substrate and a plurality of radiation units arranged on the dielectric substrate. Each radiation unit comprises a ring-shaped radiation element and a frequency selective surface arranged in the ring-shaped radiation element, and the frequency selective surface and the ring-shaped radiation element are insulated from each other. Each ring-shaped radiation element is provided with a gap. The low-frequency antenna provided by the application has a relatively wide wave transmission characteristic, and can realize relatively independent regulation and control.

This application belongs to the field of microwave engineering, specifically relating to a dual-polarization, reconfigurable, stealthy, and transparent integrated frequency selective surface and radome. The frequency selective surface consists of a three-layer structure: an adjustable FSS layer, an adjustable impedance layer, and a non-adjustable impedance layer. A PIN diode is loaded in the adjustable layer, while a resistor is loaded in the impedance layer. A spiral resonator and an interdigital capacitor resonator are used in the non-adjustable and adjustable impedance layers, respectively. Metal structures arranged in the x and y directions are placed on both sides of the adjustable impedance layer to achieve dual polarization. The adjustable FSS layer forms a transmission window and has reconfigurable functionality. Utilizing the PIN diode and multi-layer structure design, the switching between transmission and absorption functions in the X-band is achieved, realizing a stealthy and transparent integrated design. Transmission and absorption modes can be switched in the X-band, achieving integrated stealth functionality. The radome, through this frequency selective surface, possesses both transmission and absorption capabilities and reconfigurable characteristics.

This invention discloses a single-polarization broadband signal anti-reflection power-generating glass, an etching method, and an installation method, relating to the fields of communication and photovoltaic power generation technology. The power-generating glass includes an ultra-clear glass substrate and a plurality of single-segment thin-film solar cells connected in series within a layer of the ultra-clear glass substrate. Each single-segment thin-film solar cell includes a positive electrode, a power-generating thin film layer, and a back electrode. The positive electrode, power-generating thin film layer, and back electrode are sequentially stacked and bonded along the thickness direction of the ultra-clear glass substrate, and each is etched with periodically arranged rectangular patterns. The long side of each rectangular pattern is horizontal, forming a frequency-selective surface for the penetration of vertically polarized electromagnetic signals. This invention, by etching rectangular patterns on the power-generating glass, achieves efficient transmission of signals in the target frequency band while ensuring power generation functionality, solving the problem of traditional power-generating glass blocking communication signals and improving the quality of broadband signal transmission.

The application discloses a kind of composite electromagnetic shield manufacturing method in technical field, 1) lay down skin, 2) make pre-extraction bag;3) place first layer of adhesive film;4) according to the position of component on circuit board, place lower circuit board, place positioning pin;5) place second layer of adhesive film;6) place PMI foam;7) place third layer of adhesive film;8) according to the position of component on circuit board, place upper circuit board, ensure that the positioning hole made of upper circuit board and the positioning hole of lower circuit can be coincided by positioning pin;9) place fourth layer of adhesive film;10) lay up skin;11) make vacuum bag;12) solidification;13) after solidification, demoulding, machining;13) carry out product nondestructive testing.The application uses co-curing forming method, realizes skin and circuit board co-curing forming, and provides a new type of material composition equipment for electromagnetic energy low-pass characteristic electromagnetic energy selective surface device.

The disclosed technology relates to an antenna module comprising: at least one array of antenna elements (101); at least one layer comprising a frequency selective surface (102; 107) configured to control the transmission and reflection of electromagnetic waves; and a reflector (104), the reflector comprising an opening. In accordance with the disclosed techniques, one of the at least one layer comprising a frequency selective surface (FSS) is mounted on / to the opening in the reflector (104), and an antenna element (106) mounted on the at least one FSS layer (107) is capacitively coupled to a conductive reflector material surrounding the opening in the reflector (104).

The application discloses a double-passband low-frequency passband independently tunable frequency selective surface, metal columns pass through cross structure metal layers to connect upper and lower double-passband metal layers, form a multilayer cascade structure to expand bandwidth and adjust characteristics in the passband, the upper and lower double-passband metal layers include an outer metal frame and four branches in the outer metal frame, a variable capacitance diode is arranged on each branch, the side of the branch extends to the outer metal frame and / or the outer metal frame extends to the side of the branch to form a first gap; when direct current is fed through the metal columns, the variable capacitance diode provides a first capacitance, the first gap provides a second capacitance, the first capacitance is greater than the second capacitance, the first capacitance is used for controlling a low-frequency passband, and the second capacitance is used for controlling a high-frequency passband; when different direct currents are applied to the two ends of the variable capacitance diode, the low-frequency passband is moved, the high-frequency passband remains unchanged, and independent tuning of the low-frequency passband is realized.

The invention discloses a dual-polarization band-pass three-dimensional frequency selective surface which comprises a plurality of unit structures arranged in a matrix on a two-dimensional plane. Each unit structure comprises a square metal column, a first square medium cylinder attached to the peripheral surface of the square metal column, and a second square medium cylinder attached to the peripheral surface of the first square medium cylinder; a first groove and a second groove which are crossed are symmetrically formed in the upper surface and the lower surface of the square metal column; the first square medium cylinder comprises four first side walls, the surface, far away from the square metal column, of each first side wall is a layer of metal patch, and the center of each first side wall is embedded into a first metal cylinder; the second square medium cylinder comprises four second side walls, and a second metal cylinder is embedded into the center of each second side wall; and the adjacent unit structures are interconnected through two adjacent and parallel second side walls in the respective second square medium cylinders. The antenna has the characteristics of dual polarization, flat third-order passband, relatively wide out-of-band rejection and good angle stability.

A method for making an uncoated fine mesh design on a coated surface. The aim of this design is to completely or partially reflect or transmit specific frequencies of the electromagnetic spectrum. Such design is referred to as a frequency selective surface (FSS). More particularly, the invention relates to masking a portion of the surface of the substrate prior to deposition of the coating and later removing the mask by water washing in the process, leaving the designed fine mesh FSS pattern.

This invention relates to the field of optical imaging technology, specifically providing an optical radar co-aperture off-axis imaging system, comprising: an off-axis mirror assembly, a frequency-splitting device, a radar transceiver system, and an optical imaging system. The frequency-splitting device is disposed in the rear optical path of the secondary mirror and is used to reflect light waves and transmit microwaves. The frequency-splitting device includes a frequency-selective surface, which comprises an FSS pattern layer and a bias line layer. The FSS pattern layer includes periodically arranged FSS units. Nonlinear capacitors are electrically connected to the FSS units. The bias line layer applies a voltage to the nonlinear capacitors according to the received microwave band. By changing the voltage applied to the nonlinear capacitors, the resonant frequency of the FSS units is tuned, thereby changing the microwave passband frequency of the frequency-splitting device. This invention not only achieves a reflective wave-transmitting microwave design but also solves the problem that transmitting only a single band of microwaves in microwave-transmitting and light-reflecting methods is difficult to adapt to different task requirements.

This invention discloses a low-pass, high-absorption energy selective surface based on magnetic materials, comprising multiple periodically distributed units. Each unit includes, from top to bottom, a magnetic material layer and an energy selective layer. The energy selective layer includes a dielectric substrate, and first to seventh metal structures and first to eighth diodes disposed on the dielectric substrate. This invention achieves a low-intervention, low-frequency passband with low insertion loss and an ultra-wide absorption band at high frequencies by forming a complete circuit through multiple diodes and impedance matching between the magnetic material and the energy selective layer. When low-power electromagnetic waves are incident, it achieves high shielding effectiveness within the operating frequency band and an ultra-wide absorption band outside the band. The overall design of this invention is simple, the principle is clear, it is easy to manufacture, and it is inexpensive, with broad application prospects.

The invention relates to a dual-band wave-transparent frequency selective surface structure with stable polarization and angle, the frequency selective surface structure is formed by periodically arranging same unit structures, and each unit structure comprises a single-layer dielectric substrate and a single-layer metal layer loaded on the upper surface of the dielectric substrate; an external regular hexagon metal ring, a middle regular hexagon metal ring and an internal regular hexagon metal sheet are sequentially nested in the single-layer metal layer at intervals from outside to inside, first grooves are etched in all edges of the middle regular hexagon metal ring at intervals, the number of the first grooves is a first number, and the depth of the first grooves is within a first depth range. Second grooves with the second number being the second number and the depths within the second depth range are etched in all the edges of the internal regular hexagon metal sheet at intervals, and all the grooves corresponding to all the edges are symmetrically distributed relative to the center lines of the edges where the grooves are located. According to the invention, good polarization and angle stability and a small structure size are realized.

The invention discloses a cascade frequency selective surface with a steep transition band and a wide passband. The cascade frequency selective surface sequentially comprises a frequency selective surface with a steep sideband, a honeycomb core layer and a frequency selective surface with a wide passband from top to bottom along a Z-axis direction, the frequency selective surface with the steep sideband is used for providing a frequency response characteristic of rapid roll-off at the edge of a passband to form a steep transition band; the frequency selective surface with the wide passband is used for providing a broadband wave-transparent characteristic and a broadband stop-band suppression characteristic; the honeycomb core layer is used for cascading a frequency selective surface with a steep sideband and a frequency selective surface with a wide passband; and electromagnetic coupling between the upper and lower layers of frequency selection surfaces is reduced, so that the frequency selection surface with a steep sideband and the frequency selection surface with a wide passband maintain relatively independent resonance characteristics. According to the invention, the square annular patch with central symmetry is used, and the four branches are added, so that the symmetry enables the angle to be stable, and the processing complexity is simplified.

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.