78results about How to "High wave transmittance" patented technology

The invention relates to a radome with the enhanced ultra-high molecular weight polyethylene (UHMWPE), the preparation method and the application thereof. The radome can be made of a composite material with the enhanced UHMWPE fabric and also be made of the glued joint of a surface material and a sandwich material through a cementing compound with the solidification temperature being below 130 DEG C, wherein the surface material is the composite material with the enhanced UHMWPE, and the sandwich material is the material with low density and low dielectric property. The radome not only good has mechanical property and high wave transmissivity, but also is weather resist, therefore, the radome can provide protection for a radar antenna in terrible conditions and prolong the service life thereof.

The invention discloses a fiberglass radome modified by glass beads, which reduces the DK value thereof, and improves the wave penetration performance of the products. The fiberglass radome modified by glass beads is prepared by the following raw materials in weight portion: 100 portions of unsaturated polyester, 2-10 portions of glass beads, 0.5-2 portions of mold release agent, 0.5-2 portions of curing agent and 0.5-2 portions of accelerator.

The invention belongs to the technical field of fiber reinforced composite materials and preparation methods thereof, and particularly discloses a quartz fiber reinforced composite material and a preparation method thereof. The composite material uses silicon dioxide and organic silicon resin in a mass ratio of (0.5-3): 1 as composite matrix and uses quartz fiber as a reinforcing phase, wherein the quartz fiber accounts for 30 to 55 percent of the volume of the composite material. The preparation method for the composite material comprises the following steps of: firstly, performing pretreatment operations such as soaking, drying, thermal treatment and the like on a quartz fiber fabricated part; secondly, placing the quartz fiber fabricated part into ion-free silicon sol to perform vacuum impregnation so as to introduce the silicon dioxide matrix; thirdly, machining and cleaning the quartz fiber fabricated part, and then placing the quartz fiber fabricated part into anhydrous ethanol solution of organic silicon resin to perform secondary vacuum impregnation and pressure impregnation; and finally, performing cross linking on the quartz fiber fabricated part to obtain the quartz fiber reinforced composite material. The quartz fiber reinforced composite material has the advantages of good dielectric property, high wave transmittance, strong capability of resisting long-time heating of ultrahigh power density microwave, good weather resistance, good rigidity and the like.

The invention discloses a high-wave transmission hollow-structure radome. The high-wave transmission hollow-structure radome comprises a radome body; the side wall of the radome body comprises a hollow fabric layer. The high-wave transmission hollow-structure antenna cover is advantageous in high strength, light weight, easiness in manufacture, low price, low loss and high transmission rate, and can be used as various types of antenna protection. With the high-wave transmission hollow-structure radome adopted, requirements of antennas, for various kinds of performance of the radome can be satisfied, and higher wave transmission rate can be realized, and electromagnetic wave loss can be reduced.

The invention discloses a composite material for airborne radomes, and a preparation method thereof. The composite material for airborne radomes comprises a surface coating layer, an outer skin layer, a sandwich layer and an inner skin layer, the sandwich layer is arranged between the outer skin layer and the inner skin layer, and the surface of the outer skin layer is coated with the surface coating layer; the thickness of the outer skin layer is 0.2-1mm; the sandwich layer is made of polymethacrylimide, and has a right trapezoid structure, the short edge thickness is 4-30mm, and the long edge thickness is 4.5-34mm; and the thickness of the inner coating layer is 0.2-1mm. The preparation method comprises the following steps: preparing an inner skin layer prepreg through manual pasting dipping, overlaying a sandwich layer material, solidifying, preparing an outer skin layer prepreg through manual pasting dipping, solidifying, spraying the surface coating layer, and solidifying. The composite material for airborne radomes has the advantages of excellent environment resistance, good whole bearing ability, and maintenance of a high wave penetration rate in double wavebands.

The invention provides a metamaterial radome based on the frequency triggering mechanism, aims to improve the transmission rate of the radome under the premise of ensuring the physical strength of theradome, improves electromagnetic protection flexibility and widens the transmission band. The metamaterial radome comprises a radome supporting layer and a multi-layer super-surface structure, wherein the radome support layer 1 is a cover made of a dielectric flat plate or a dielectric housing material and is used for ensuring the physical strength and mechanical loading of the radome, the multi-layer super-surface structure adopts a laminated structure composed of at least two first dielectric substrates and a second dielectric substrate sandwiched between the adjacent first dielectric substrates, two sides of the first dielectric substrate are respectively printed with at least three uniformly-arranged annular metal patches for realizing frequency triggering characteristics of the radome, and the dielectric constant of the first dielectric substrate is greater than the dielectric constant of the second dielectric substrate.

The invention relates to a preparation method of a fiber-reinforced Al2O3-SiO2 aerogel material with a wave transmission and heat insulation integrated function. The preparation method includes mixing a silicon source with an aluminum source, subjecting the mixture to hydrolysis reaction, taking epoxide as a coagulant, functional powder with excellent wave transmission performance as an additive and inorganic high-temperature-resistant ceramic fibers as a reinforcement body, performing melting-gelling, ageing and supercritical drying to obtain precursor compound aerogel, and subjecting the precursor compound aerogel to air heat calcination in a muffle furnace to finally obtain the fiber-reinforced Al2O3-SiO2 aerogel material with the wave transmission and heat insulation integrated function. The preparation method has the advantages of simplicity of raw materials, simplicity and convenience in process, simplicity in technological process operation and easiness in mass production.

The invention relates to a improved low dielectric, wave-passable multi-hole ceramic material and the manufacturing method. The weight proportion of the raw material is that quartz: aluminum phosphate: silicon nitride= (40-55): (40-55): (5-10), and 1-10% abio-liquid foaming agent. Pressing into mold after graining, the diameter is controlled to 60-90mm. The invention would satisfy application request, and it is easy to operate.

The invention is applicable to the technical field of stealth technologies and radar radomes, and provides a periodic unit of a cross-scale double-band-pass frequency selective surface, the periodic unit comprises a square annular slot patch and an arrow-shaped slot patch, and the square annular slot patch is communicated with a slot of the arrow-shaped slot patch. A periodic unit of a cross-scaledouble-band-pass frequency selective surface is designed by adopting a novel composite FSS pattern; according to the dual-waveband wave-transparent radome, the wave-transparent rates, bandwidths, angles and polarization stability of two passbands can be improved, high wave-transparent performance of two working wavebands of the dual-waveband wave-transparent radome under the non-frequency-doubling relation can be guaranteed, and the wave-transparent and stealth requirements can still be met under wide-angle (0-50 degrees) irradiation.

The invention discloses a glass fiber reinforced plastic antenna housing modified by aluminum hydroxide, which has the advantages of reducing DK value thereof and improving the wave penetrating property of the product. The glass fiber reinforced plastic antenna housing modified by aluminum hydroxide is prepared from the following raw materials in part by weight: 100 parts of unsaturated polyester, 5 to 30 parts of aluminum hydroxide, 0.5 to 2 parts of releasing agent, 0.5 to 2 parts of curing agent and 0.5 to 2 parts of accelerant.

The invention relates to a preparation method of a hollow aluminum oxide ceramic microsphere modified polyurethane coating. The preparation method comprises the following steps: preparing hollow aluminum oxide ceramic microspheres, namely treating aluminum nitrate and monosaccharide raw materials by virtue of steps of ultrasound, magnetic stirring, hydrothermal treatment, heat treatment and the like to obtain the hollow aluminum oxide ceramic microspheres with uniform particle size; and blending the obtained ceramic microspheres with waterborne polyurethane, and carrying out high-speed dispersion, ultrasound, spin coating and curing to obtain a composite coating. The preparation method provided by the invention has the advantages that nontoxic and easily available raw materials are adopted, a preparation process is simple, technology is controllable, cost is low, repeatability is good, and the hollow aluminum oxide ceramic microspheres are uniformly distributed. The prepared composite coating has the characteristics of environmental friendliness, light weight, high strength, high hardness, high wave transmission, low thermal conductivity, low infrared emissivity, excellent wear resistance, excellent weather resistance and the like and can be applied to the fields of heat insulation coatings, infrared stealth and the like.

The invention relates to a wideband-elimination metamaterial which comprises a metamaterial slice, the metamaterial slice comprises a media substrate and two structure layers which are attached to two opposite surfaces of the media substrate respectively, each structure layer comprises a plurality of regularly hexagonal metal micro-structures, the two metal micro-structures in the two structure layers, positioned at corresponding positions of the media substrate, form a pair, two adjacent sides of any two adjacent metal micro-structures in each structure layer are parallel to each other, so that the central interval of any two adjacent metal micro-structures is reduced, thus being capable of restraining electromagnetic wave in an ultrawide high frequency range so as to enable the metamaterials to have a wideband-elimination function; and the electromagnetic wave in low frequency range has the advantages of high wave transmittance and small reflection as well as good wave transmitting property. The invention further relates to a wideband-elimination metamaterial antenna housing and an antenna system which are produced by the wideband-elimination metamaterials.

The invention discloses a self-feeding four-arm spiral GPS satellite signal receiving antenna, which comprises: a feeding rod, a socket, a dielectric sleeve, a mounting flange, a feeding pipe, a helical wire, an inner conductor; two ends of the helical wire and the feeding pipe Welded together; the rear end of the feed pipe is inserted into the round hole of the mounting flange; the inner conductor located in the center of the feed pipe, the left end is welded on the feed pipe, and the right end is connected to the feed rod through threads; the feed rod rests on the medium in the socket The sleeve is fixed in the socket; the socket is the feed port of the antenna, and the high-frequency cable is connected to feed the antenna. The invention simplifies the system structure and improves the system reliability.

The present invention relates to a coupling agent containing diphenylsulfone amino-silane and the related preparation method, which is technically characterized in that 4,4-diphenylsulfone and gamma-chloropropthyl type silane are taken as raw materials and dimethyl formamide is used as the solvent. Preparation steps are as follows: the solvent dimethyl formamide and the raw materials 4,4-diphenylsulfone are sequentially added to three flasks to be stirred until dissolved, then nitrogen gas is input to the flasks; when the flasks are slowly heated to 100 or 150 DEG C, a certain amount of gamma-chloropropthyl type silane are dropped into the flasks, after that, the liquid in the flasks is reflowed to 5 - 15 h at the right temperature; then, the coupling agent can be produced after decompression distillation and the removal of the solvent. The introduction of diphenylsulfone reduces the polarity of active amido, so that the coupling agent is provided with a low dielectric loss angle tangent value. When the coupling agent is used for glass fiber-reinforced epoxy resin or cyanate ester resin and other thermosetting resin composite materials, the dielectric performance of such composite materials can be increased, therefore, the coupling agent is widely applied to wave-transparent composite material field, such as antennas and radomes.

A transforming lens generating Bessel wave beams comprises two outer layer dielectric lenses and a core layer dielectric lens. The outer layer dielectric lenses are low dielectric constant dielectric sheets, and phase shift units with 0-90 degree insertion phase shift are distributed on the outer layer dielectric lenses according to a square grid. The core layer dielectric lens is a high dielectric constant dielectric sheet, and phase shift units with 0 / 180 degree insertion phase shift are distributed on the core layer dielectric lens according to a square grid. The dielectric transforming lens can transform incident Gaussian wave beams into the Bessel wave beams, and has the advantages of being high in transformation efficiency, diverse in wave beam transformation, easy to machine and install and the like.

The invention discloses a fiberglass radome modified by PE micro powder, which reduces the DK value thereof, and improves the wave penetration performance of the products. The fiberglass radome modified by PE micro powder is prepared by the following raw materials in weight portion: 100 portions of unsaturated polyester, 3-15 portions of PE micro powder, 0.5-2 portions of mold release agent, 0.5-2 portions of curing agent and 0.5-2 portions of accelerator.

The invention discloses a bi-waveband high-wave-transmittance metasurface which comprises structural units arranged in an array, wherein each structural unit comprises two opposite dielectric substrates, and a metal folding line between the two dielectric substrates. The metal folding line is etched in the middle of the dielectric substrates. The large-angle high-wave-transmittance metasurface has the advantages of simple structure, easy processing, high transmissibility in large incident angle, and bi-waveband transmission property. When the incident angle is large, the bi-waveband high-wave-transmittance metasurface realizes high transmission between two wavebands of Ku and Ka, and has total reflection characteristic in the X wave band. Combination of two functions is realized.

The invention provides a "V"-shaped radar radome structure and a preparation method thereof. The radome structure is obtained by co-curing of an antenna, a skin and a filling core layer, the skin andthe filling core layer are adhered by using an adhesive layer so as to form the radome, and the antenna and the filling core layer are adhered by using the adhesive layer and wrapped in the radome. The influence of multilayer reflection interference of the conventional interlayer radome surface can be weakened by the integral design of the radome and the antenna. Besides, compared with the multilayer skin core layer structure, only one skin is required, the wave permeability can be enhanced by the ultrathin skin design and the error of aiming can be greatly reduced. Meanwhile, the antenna pattern and phase consistency can be enhanced, and the problems of reduction of the wave permeability and pattern distortion under the broadband condition of the "V"-shaped radome can be solved, and the wave permeability, the pattern and the phase consistency of the "V"-shaped radome are enabled to meet the working requirements of the radar antenna.

The invention discloses a low loss electromagnetic induced transparency all dielectric meta-material structure insensitive to polarization and incoming angles and belongs to the technical field of meta-material. A cubic plane of a first cube of the low loss electromagnetic induced transparency all dielectric meta-material structure is provided with a first square air hole and a second square air hole along the X-axis direction and the Y-axis direction of a spatial rectangular coordinate system respectively. The gravity center of each of the first square air hole and the second square air holecoincides with the gravity center of the first cube. A cubic plane of a second cube is provided with a third square air hole and a fourth square air hole along the X-axis direction and the Y-axis direction of the spatial rectangular coordinate system respectively. The gravity center of each of the third square air hole and the fourth square air hole coincides with the gravity center of the first cube. The gap between the second cube and the first cube is 1 mm. When the two resonators are combined into the meta-material unit, due to near field coupling effect in Mie electromagnetic resonance, aims of low loss and high wave transmission rate can be realized.

The invention provides a dual-band corner reflector and a design method thereof. The dual-band corner reflector comprises three metal plates and a frequency selective surface dielectric plate; whereinany two of the three metal plates are perpendicular to each other, so as to form a semi-ellipse-shaped sunken structure, the two metal plates which are perpendicular to each other share a connectionedge, and all the shared connection edges are equal in length; and the frequency selective surface dielectric plate is connected with the three metal plates. Through adoption of the dual-band corner reflector of the invention, scattering properties of the dual-band corner reflector at different frequency bands can be similar.

The invention provides an electromagnetic induction transparent effect-based all-dielectric polarization converter, and relates to a low-loss and ultra-thin all-dielectric polarization converter, which solves the problem that the application of a polarization device is limited as a result of the unfavorable integration of a photon system or the high loss of the polarization device made of metal materials caused by the thickness factor of an existing polarization device in the prior art. The all-dielectric polarization converter comprises four semicircular medium bricks, wherein the four semicircular medium bricks are oppositely arranged two by two. Every two oppositely arranged semicircular medium bricks are the same in radius. One ends of four medium lines are respectively connected with the rectangular side surfaces of the four semicircular medium bricks. The other ends of four medium lines are fixedly connected to be in the + shape. The four semicircular medium bricks and the four medium lines are arranged on the upper surface of a square substrate. The above device can be used as an all-dielectric polarization converter.

The invention provides a wave-transmitting / stealth integrated metamaterial structure and a radome and an antenna window with the same. The purpose of the invention is to provide a wave-transmitting / stealth integrated structure with fewer layers, lighter weight, high transmission of electromagnetic waves in a passband and high stealth performance outside the passband. The metamaterial structure comprises a microstructure layer and at least one dielectric layer. The microstructure layer is arranged on the dielectric layer. The microstructure layer is composed of regular polygon rings arranged periodically and patch units arranged in the regular polygon rings, wherein the regular polygon rings are made of resistance materials with specific square resistance, the patch units are metal patch units and the metal patch units are concentric with the regular polygon rings.

The invention belongs to the technical field of antenna radar fittings, and particularly discloses an antenna radar cover and a preparation method thereof. The preparation method comprises the following steps of: preparing a glass fiber sheet material by SMC (Sheet Molding Compound) resin, low shrink resin, fillers, a process assistant, a thickener, a release agent and an alkali-free glass fiber through a die; carrying out die assembling, curing and pressing the glass fiber sheet material to form a regularly dodecahedral or icosahedral sheet board, or a hemispherical panel and a spherical table cylinder; and then splicing to obtain a spherical antenna radar cover with a hemispherical cross section. The antenna radar cover not only has a high mechanical property and can be used in a severeenvironment, but also further has a higher wave transmission rate and is good for use of radar.

The invention relates to the technical field of functional materials, and particularly relates to a preparation method of a double-layer cement-based wave-absorbing material. The preparation method of the double-layer cement-based wave-absorbing material comprises the following steps of (1), dispersing a carbon nano tube; (2), preparing a matching layer and a wave-absorbing layer; (3), preparing the double-layer cement-based wave-absorbing material. According to the preparation method, expanded perlite is used as an impedance matching layer; the carbon nano tube and ferrite are used as wave absorber to prepare a double-layer cement-based wave-absorbing body; the wave absorption performance of a cement-based wave-absorbing material is researched. Shown by an experimental result, the wave transmission rate of the matching layer is increased as the doping amount of the expanded perlite is increased; in the frequency range of 8GHz to 18GHZ, the wave transmission rate of a test sample in which 20 percent of the expanded perlite is doped is between 20 percent and 60 percent; the wave absorption performance of a double-layer cement-based material prepared by using cement paste of the expanded perlite as the matching layer is superior to a single-layer wave-absorbing material with the same thickness.

The invention relates to a radome which belongs to the technical field of antenna protection equipment. The radome can resist wind, sand, water, moisture and heat, is easy to disassemble, and is easy to maintain an antenna. The radome provided by the invention comprises a top casing, a left casing, a right casing and a base. The top casing is composed of a top casing body and a top casing seat. The top casing seat and the base are provided with a first arc-shaped groove and a second arc-shaped groove respectively, wherein the first arc-shaped groove and the second arc-shaped groove are opposed to each other and are arranged from the inside to the outside. The left casing and the right casing can be arranged in the first arc-shaped groove and the second arc-shaped groove respectively. The right casing can slide along the second arc-shaped groove to open and close the left casing and the right casing. The radome can resist wind, sand, water, moisture and heat, has the advantages of great mechanical strength and easy installation and disassembly, and is not easy to damage. The antenna is maintained without removing the radome. The radome has the advantages of low production costs and long service life.

The invention discloses a high-power-density microwave radiation resistant coating for a radome. The high-power-density microwave radiation resistant coating can bear the microwave radiation with the power density of 17.6-80.0 W / cm<2>; the dielectric loss angle tangent value of the coating is from 3.7*10<-2> to 3.8*10<-2>; the coating is directly adhered to the surface of the radome; a preparation method of the coating comprises the following steps: firstly mixing epoxy resin, boron nitride powder, mineral powder, a solvent and an auxiliary according to a ratio, refining the mixture through a ball milling process to obtain a component A, mixing the component A with phenolic acid according to a ratio, coating the surface of the radome material with the mixed coating, and heating and curing the radome material coated with the coating, so as to obtain the high-power-density microwave radiation resistant coating. The high-power-density microwave radiation resistant coating disclosed by the invention is low in dielectric loss tangent value, stable in performance, simple in preparation, and low in cost.

The invention discloses a manufacturing method of an optical window structure adopting hermetic packaging of a sapphire lens and kovar. The method comprises treatment before sealing of the sapphire lens: cleaning, wiping and drying are performed; peroxidation treatment before sealing of a metal formed part: the metal formed part is put in a sintering furnace heated to 700 DEG C to be oxidized and kept at the constant temperature for 10 min after being cleaned, wiped and dried, an oxidation film is formed, and then the metal formed part is taken out; convex grooves of the sapphire lens and concave grooves of the metal formed part are subjected to meshed welding through solder; sintering is performed in the sintering furnace. The convex grooves of the sapphire lens and the concave grooves of the metal formed part are subjected to meshed welding through solder, so that the yield is effectively increased, a welded part is more firmly welded, and the sealing property is improved.

The invention discloses a radar radome, which is a cover body formed by splicing thermoplastic lightweight composite plate shells. The invention also discloses a method for preparing the above-mentioned radome, which includes the following steps: placing the first layer of continuous glass fiber reinforced thermoplastic resin composite material, the glass fiber / resin mixed felt layer, the second layer of continuous glass fiber The reinforced thermoplastic resin composite material is hot-press formed into a thermoplastic light-weight composite plate shell, and the thermoplastic light-weight composite plate shell is trimmed and spliced ​​to form a cover body. The product of the invention adopts continuous glass fiber reinforced thermoplastic resin composite material as a panel, and has high mechanical strength; the glass fiber / resin mixed felt layer has low density, high porosity and high wave transmittance.

The invention relates to a mullite fiber reinforced quartz ceramic composite material, which is characterized by comprising mullite fibers with lengths of L1, L2 and L3, silicon oxide is attached to the mullite fibers; fused quartz is distributed around the mullite fibers; the length ranges of L1, L2 and L3 are as follows: L1 is more than or equal to 3 and less than 5 mm, L2 is more than or equal to 5 and less than 7 mm, and L3 is more than or equal to 7 and less than 10 mm; the weight ratio of the fibers with the lengths of L1, L2 and L3 in the mullite fibers is (0.7-1.3): 3: (0.7-1.3); and the ratio of the total weight of the mullite fibers to the weight of the fused quartz is (10-15): (40-45). The invention also provides a preparation method of the material. The performance indexes of the mullite fiber reinforced quartz ceramic composite material can meet the performance requirements of high Mach number aircraft manufacturing materials.

The invention discloses a missile-borne dual-frequency active antenna, which comprises a structural cavity, an RDSS antenna, a sky-chain antenna, a duplexer, a low noise amplifier and a connector. Theduplexer is fixed in the first cavity of the structural cavity, and the low noise amplifier is mounted on the surface of the duplexer. The RDSS antenna and the sky-chain antenna are respectively installed in the second cavity and the third cavity which are spaced apart from the first cavity and electrically connected with the duplexer through the inner conductor connector. One end of the connector is electrically connected with the low noise amplifier, and the other end protrudes from the bottom of the structural cavity to connect the external device. The internal components are shielded integrally and separated by a structural cavity with a plurality of cavities to improve the mutual isolation and anti-interference of the dual antennas. The invention improves the anti-interference ability, reduces the volume of the active antenna and ensures the output signal quality, and has the advantages of high integration degree, low noise coefficient, high isolation degree and high inhibition degree.