63results about How to "Enhanced wave performance" patented technology

The invention relates to triazine-containing benzoxazine, a triazine-containing benzoxazine polymer, and a preparation method thereof. The preparation method is characterized by: adopting cyanophenol as a raw material; adopting trifluoromethanesulfonic acid or trifluoroacetic acid as a catalyst; synthesizing triazine-containing trihydric phenol (TP for short) in dichloromethane or chloroform or acetone at a common temperature; adopting the synthesized TP, formaldehyde and aminated compounds as reaction raw materials; adopting a alkali as the catalyst, and carrying out a reaction in a alcohol solvent or a ether solvent to synthesize a series of triazine-containing polycyclic benzoxazine monomers (BZ for short) which have not been reported; heating the BZ to carry out a ring-opening polymerization to form polybenzoxazine (PBZ for short). A structural formula of the monomer BZ is shown as follow, substituents R are shown in the specification. The synthesized novel monomer provided by the present invention contains a triazine ring structure, such that the triazine content in the PBZ resin can be substantially raised so as to notably improve heat resistance, residual carbon rate, fire resistance property and wave transmission property of the PBZ.

The invention discloses a carbon-based composite building wave absorption and heat preservation material and a preparation method thereof. According to the preparation method, carbon-based wave absorbing agent, common silicate cement, expanded and vitrified small balls, re-dispersible latex powder, hydroxypropyl methyl cellulose, wood fiber, polypropylene fiber, surfactant, foam stabilizer, waterreducing agent, coupling agent, water and the like are adopted; and the material is obtained by adopting the steps of stirring, pouring molding, curing and the like. The material has the advantages of good wave absorption performance and heat insulation performance, low apparent density, low cost, high fire resistance, durability and the like, and is easy to construct. The material can be used for pouring roofs and walls of buildings, so that aims of electromagnetic radiation protection and energy conservation of the buildings are fulfilled.

The invention discloses a method for preparing a double-layer wave-permeable heat proofing and insulating composite structural part. The structural part comprises an inner heat insulation material and an outer heat-proof +material. The method includes steps of preparation of the outer heat-proof material, preparation of silicon oxide hollow microspheres, preparation of chopped fiber reinforced silicon oxide hollow microsphere slurry, casting of the chopped fiber reinforced silicon oxide hollow microsphere slurry and thermal treatment of a structural part blank material. Quartz fiber reinforced quartz composite ceramic serves as the outer heat-proof material, chopped fiber reinforced silicon oxide hollow microsphere ceramic serves as the inner heat insulation material, compact combination of the inner and outer materials is realized by means of slurry casting and high-temperature sintering moulding, and integration of advantageous performances of high temperature resistance, heat proofing, heat insulation, wave permeability and the like is realized.

The invention discloses a glass fiber reinforced plastic antenna housing and a preparation method thereof. The glass fiber reinforced plastic antenna housing comprises the following raw materials, by mass, 100 parts of thermosetting synthetic resin, 0.3-1.8 parts of glass bead, 0.6-1.9 parts of release agent and 0.5-4 parts of curing agent. The preparation method includes that a thermosetting synthetic resin solution and the glass beads are stirred and mixed to form required slurry, and the slurry is placed in a resin groove. A yarn end is drawn out from glass fiber yarn on a yarn support, and the glass fiber yarn is arranged through a yarn guiding plate to penetrate through the resin groove containing the slurry to be soaked. A plurality of sheets of glass fiber mats drawn out from a mat support clamp the glass fiber yarn soaked in the slurry. Mat yarn composite is led to a mold and heated to be cured and molded. A molded antenna housing assembly is drawn out from a mold outlet through a dragging device and assembled to form the glass fiber reinforced plastic antenna housing. The glass beads are added in the resin, the mechanical strength is improved, dielectric loss and cost are reduced, and wave penetrating effect is improved. Surface modification processing is conducted on the fiber mats and the glass beads, and bond between the fiber mats and the glass beads is improved.

The invention relates to a making method of a high temperature-resistant wave transmitting ceramic coat on a metal surface, and concretely relates to a making method of an amorphous aluminum phosphate-based high temperature-resistant wave transmitting ceramic coat on the metal surface. The purpose of the invention is solving the problems of low high temperature resistance temperature and low wave transmittance of present organic coat systems. The method comprises the following steps: 1, weighing a raw material; 2, preparing an amorphous AlPO4 adhesive solution; 3, preparing a wave transmitting ceramic coating; and 4, preparing the amorphous aluminum phosphate-based high temperature-resistant wave transmitting ceramic coat on the metal surface. The coat obtained in the invention has good dielectric properties, and the dielectric constant is small, so the dielectric loss angle is small, thereby the electromagnetic wave transmittance is improved, and the wave transmittance is greater than 80% in 1-18GHz; and the high temperature resistance is good, the high temperature resistance temperature is 500-1300DEG C, and the amorphous aluminum phosphate-based high temperature-resistant wave transmitting ceramic coat has the advantages of environmentally-friendly and nontoxic raw material, good film forming property, low cost, simple preparation method and short period.

The invention relates to a wave-transmitting meta-material and an antenna cover and an antenna system with the material. The wave-transmitting meta-material comprises a first substrate and a second substrate, wherein one layer of square patches with holes at the centers are clamped between the first substrate and the second substrate in an array manner; and circular patches which are arranged in an array manner are arranged on the outer surfaces of the first and second substrates. According to the wave-transmitting meta-material and the antenna cover and the antenna system with the material disclosed by the invention, the wave-transmitting efficiency is high, the loss is small, and the selective wave-transmitting function is realized.

The invention relates to a dual-passband wave-transmitting material, a radome and an antenna system. The dual-passband wave-transmitting material comprises a first substrate and a second substrate which are made of non-metal materials, and a plurality of first metal micro-structures clamped between the first substrate and the second substrate and arranged in a latticed manner, wherein no gap is reserved between the adjacent first metal micro-structures; and the first metal micro-structures adopt cross-shaped structures. The invention also provided a radome and an antenna system. The dual-passband wave-transmitting material, the radome and the antenna system, provided by the invention, can work in two frequency bands, have high wave-transmitting efficiency in the two frequency bands, and can shield other frequency bands, thereby eliminating interference and ensuring favorable work environments of the antenna. After the antenna is equipped with the radome, the radiating capacity of the antenna is enhanced and the gain is effectively improved.

The invention relates to a broadband metamaterial antenna housing and an antenna system. The metamaterial antenna housing works in the Ku wave band. The broadband metamaterial antenna housing comprises at least one metamaterial sheet layer, wherein each metamaterial sheet layer comprises a first substrate and a plurality of artificial microstructures which are arranged on the first substrate in an array mode, and the sizes of the artificial microstructures are the same. Each artificial microstructure comprises a snowflake-shaped structure, and each snowflake-shaped structure comprises a cross-shaped structure and four straight-line-shaped structures which are same in size and arranged on four end points of the cross-shaped structure respectively. According to the broadband metamaterial antenna housing, the artificial microstructures in specific shapes are attached to the first substrates to obtain needed electromagnetic responses, wave-transparent performance of the antenna housing based on metamaterials is strengthened, and anti-interference capacity is increased. The working band of the antenna housing is the Ku wave band (12-18GHz), wave-transparent efficiency within the band is high, and losses are fewer. Furthermore, the working band of the antenna housing still has good wave-transparent performance when an electromagnetic wave band incomes in a certain angle.

The invention relates to a low-loss metamaterial antenna housing which comprises at least one metamaterial piece layer. Each metamaterial piece layer comprises a first substrate and a plurality of man-made micro-structures with the same size, wherein the man-made micro-structures are distributed on each first substrate in an array mode. The man-made micro-structures are of cross-shaped structures. Due to the fact that the man-made micro-structures in specific shapes are attached to the substrates, required electromagnetic response is obtained, the wave-transparent performance of the antenna housing based on the metamaterial is strengthened, and anti-jamming capability is improved. Meanwhile, the loss of the antenna housing nearby the frequency point range of 30GHz is quite low, and wave-transparent efficiency is quite high.

An embodiment of the present invention provides a wave-absorbing and wave-transparent super material structure and an aircraft. The structure comprises at least one first microstructure array, at least one second microstructure array and a first dielectric layer, the at least one first microstructure array, the first dielectric layer and the at least one second microstructure array are stacked inorder. Each first dielectric microstructure array comprises multiple wave-absorbing microstructures, and each second microstructure array comprises multiple wave-transparent reflection microstructures. The structure has high wave-absorbing performance for incident electromagnetic waves in an X band and a Ku-band or the X-band and has high wave-transparent performance for incident electromagnetic waves in a P band.

The invention discloses a bandpass filter metamaterial, an antenna cover and an antenna system, wherein the bandpass filter metamaterial comprises a plurality of functional layers. Each functional layer comprises a dielectric layer and a conductive geometric structure which is arranged on the dielectric layer, wherein the conductive geometric structure on the dielectric layer of at least one functional layer in the multiple functional layers is a conductive sheet, and the geometric structure on the dielectric layer of another functional layer is grid-shaped. The bandpass filter metamaterial, the antenna cover and the antenna system improve wave penetrating effect of the antenna cover.

The invention discloses a high-wave-transparent porous quartz/quartz ceramic-based composite material and a preparation method thereof. The composite material comprises a quartz fiber-reinforced body, a quartz base body and pores, and is characterized in that the pores are uniformly existent in the part of the composite material, close to the inner surface. Pure iron wires are prefabricated in a reinforced structure formed by weaving or stacking quartz fibers, a quartz-based composite material is synthesized through a sol-gel method, and the iron wires in the composite material are etched off by a mixed solution of nitric acid and sulfuric acid to obtain the high-wave-transparent porous quartz/quartz ceramic-based composite material. The composite material has the advantages of high strength and good mechanical property and wave transmittance.

The invention discloses a glass fiber reinforced plastic radome and a preparation method thereof. The glass fiber reinforced plastic radome is formed by glass fiber yarns, a glass fiber mat, thermosetting resin, and fillers by the adoption of pultrusion process, the glass fiber yarns are composite yarns of glass fiber straight yarns and glass fiber bulk yarns, and the mass percent of the glass fiber straight yarns to the glass fiber bulk yarns is 45-55%:45-55%. According to the glass fiber reinforced plastic radome, the glass fiber yarns are the composite yarns of the glass fiber straight yarns and the glass fiber bulk yarns, on one hand, by the adoption of the bulk yarns, the strength of the composite material is enhanced, the contents of the glass fiber yarns and the glass fiber mat can be reduced, the gross weight of the product is reduced, the strength cost of an outdoor fixing rack is reduced, the installation difficulty is reduced, the content of glass fiber is reduced, the dielectric constant is reduced, and the wave transmission performance of antennas can be improved; on the other hand, the resin filling content is increased via the bulkiness of the bulk yarns, and good product surface effect can be obtained.

The invention belongs to the technical field of radomes, and particularly relates to a glass fiber reinforced plastic pultrusion radome for 5G base stations and a preparation method thereof. The glassfiber reinforced plastic pultrusion radome for 5G base stations is formed by pultrusion of glass fibers, unsaturated polyester resin, a flame retardant, aluminum hydroxide, filler, PE powder, an ultraviolet light absorber UV-2, an antioxidant, a release agent, a high-temperature curing agent, a medium-temperature curing agent and a low-temperature curing agent. The density of the glass fiber reinforced plastic pultrusion radome product for 5G base stations is 1.1-1.3 g/cm<3>, the dielectric constant is 2.8+/-0.2 u, the dielectric loss is 5-10 mu, the material is suitable for construction requirements of 5G base stations, the same performance requirements of plastic radomes can be met, and the mechanical properties, corrosion resistance and high and low temperature resistance of the material are superior to those of the plastic radomes. In addition, the cost of the glass fiber reinforced plastic pultrusion radome for 5G base stations is lower, and the construction cost of a 5G base station is greatly reduced.

The invention relates to a metamaterial antenna housing and an antenna system. The metamaterial antenna housing comprises at least one metamaterial sheet layer. The metamaterial sheet layer comprises a first substrate and a plurality of artificial microstructures which are arranged on the first substrate in an array mode, and are identical in size. Each artificial microstructure is of a crossed structure, and no gap exists between every two adjacent crossed structures. Needed electromagnetic response is obtained by attaching the metamaterial antenna housing through the artificial microstructures with specific shapes to the substrates, wave-transparent performance of the antenna housing is improved, and capacity of resisting disturbance of the antenna housing based on a metamaterial is improved. In the range of 3.6-18GHz, the metamaterial antenna housing is quite low in loss, and quite high in wave-transparent efficiency.

The invention discloses a porous silicon-nitride-based hole sealing coating and a preparation method and application thereof. In one embodiment, the method comprises: selecting a single crystal silicon target as a cathode, and using a magnetron sputtering deposition technology to prepare a silicon nitride hole sealing coating under the nitrogen atmosphere; then adopting a certain heat treatment process for performing high-temperature sintering; and afterwards, using a hydrophobic modifier for performing hydrophobic treatment so as to obtain the porous silicon-nitride-based hole sealing coating. The binding property of the hole sealing coating with a porous silicon-nitride-based substrate is good, and the hole sealing coating has the advantages of compact structure, controllable thickness, high hardness, low internal stress, no macro defect, high wave permeability, and the like, and can be applied in multiple fields. According to the invention, multiple technologies are combined to prepare the silicon-nitride-based hole sealing coating, and the silicon-nitride-based hole sealing coating with excellent comprehensive performance is obtained, therefore, the effective protection for a porous silicon nitride substrate can be realized.

The solid powder composite fuel is produced with graphite, ferric oxide and metal chloride. The production process includes crushing and sieving graphite, ferric oxide and metal chloride to obtain 50-120-mesh fine powder, mixing, and microwave ignition and combustion inside one 500-800 W microwave oven until glowing with organe light. The composite fuel is used in heating.

The invention provides a high-weather-resistant antibacterial coating layer material for castings and a preparation method thereof. The coating layer material is prepared from the following raw materials in parts by weight: 40-70 parts of modified acrylic resin, 8-16 parts of bismaleimide, 3-6 parts of triallyl isocyanurate, 5-10 parts of polyvinyl alcohol, 6-12 parts of a compound antibacterial agent, 5-10 parts of a modified mixed filling, 2-5 parts of 2,2'-methylenebis(4,6-di-tert-butylphenol), 3-6 parts of 2-hydroxy-4-n-octyloxybenzophenone, 2-7 parts of soybean lecithin, 3-8 parts of ethylene glycol monoethyl ether acetate, 4-9 parts of polydimethylsiloxane and 10-25 parts of neodecanoic acid glycidyl ester. The coating layer material has ideal mechanical strength and goop weather resistance, the antibacterial rate of the coating layer material to mixed bacteria of gram-negative escherichia coli and gram-positive staphylococcus aureus reaches up to 99.35%, so that the high-weather-resistant antibacterial coating layer material has wide application prospects.

The invention relates to a passband reconfigurable absorption/transmission integrated frequency selective surface and a basic unit. The basic unit comprises a dielectric plate, four variable capacitors and four PIN diodes, wherein a cross-shaped metal wire and a cross-shaped metal ring belt are arranged on the surface of one side of the dielectric plate, a variable capacitor is embedded in a metalarm forming the cross-shaped metal wire, the cross-shaped metal ring belt is arranged on the outer side of the cross-shaped metal wire in a sleeving mode, a cross-shaped metal sheet and a metal square ring are arranged on the surface of the other side of the dielectric plate, the metal square ring is arranged on the outer side of the cross-shaped metal sheet in a sleeving mode, each protruding end of the cross-shaped metal sheet is connected with the corresponding edge of the metal square ring through a PIN diode, the PIN diodes are arranged in a gap between the cross-shaped metal sheet and the metal square ring, a cathode is connected with the cross-shaped metal sheet, and an anode is connected with the metal square ring. According to the invention, the frequency selective surface and the basic units are of a suction/penetration integrated structure, and have the advantages of being small in size, small in thickness and high in practicability.