11results about How to "Good wave permeability" patented technology

The utility model relates to the field of signal acquisition, in particular to a signal acquisition structure with a signal shielding protection structure. The technical problem is that in the process of collecting weak signals, a conductive material is used for wrapping a signal collector to form a Faraday cage effect, so that a method for blocking external electromagnetic interference may cause certain influence on target signals, and thus the collection result may be slightly influenced. According to the technical scheme, the signal acquisition structure with the signal shielding protection structure comprises a heat dissipation assembly, a heat conduction assembly and an anti-interference assembly. By arranging the adjustable shielding device and the built-in heat dissipation system, the equipment can flexibly adjust the contact area between the signal receiving assembly and the outside, so that the acquisition effect is prevented from being influenced by insufficient target signal strength, and meanwhile, the built-in heat dissipation system can reduce the internal temperature of the equipment in real time, so that the acquisition efficiency is improved. Efficient operation in the signal acquisition process is ensured, and performance reduction caused by overheating is prevented.

The invention relates to a high-density boron nitride ceramic material as well as a preparation method and application thereof. The high-density boron nitride ceramic material comprises a main phase, a second phase and an additive, the main phase comprises h-BN, the second phase comprises Al2Y4O9, and the additive comprises chopped BN fibers. The strength of the BN composite ceramic material is enhanced by adding the chopped BN fibers into the high-density boron nitride ceramic material, meanwhile, the excellent wave-transparent performance of the BN ceramic is kept, meanwhile, the Al2Y4O9 can ensure that the boron nitride ceramic material with higher density is obtained through sintering under a relatively low-temperature condition, so that the energy consumption is reduced, the chopped BN fibers are combined with an h-BN main phase, and the energy consumption is reduced. Deformation of the h-BN main phase can be restrained, meanwhile, deformation of the h-BN main phase is restrained by the h-BN, and therefore the mutual enhancement effect is achieved; in addition, the mechanical property is further improved due to deflection of fibers or BN crystal grains when the fibers are broken and cracked, and the bending strength of the high-density boron nitride ceramic material is improved due to the comprehensive action.

The invention relates to the technical field of aircrafts, in particular to a composite material rudder wing structure for an aircraft and a preparation method thereof.The composite material rudder wing structure comprises a main beam and sandwich foam layers located on the two sides of the main beam, the main beam and the sandwich foam layers are of a structure with the middle thick and the two ends thin, and the main beam and the sandwich foam layers are connected through an adhesive; the main beam comprises at least three high-modulus glass fiber pultrusion plates, multi-axial glass fiber prepreg is arranged between the adjacent high-modulus glass fiber pultrusion plates, and the main beam and the sandwich foam layer are coated with a glass fiber-epoxy composite material layer. The rudder wing structure has the advantage of being light in weight, and the weight of the rudder wing structure can be reduced by 35%-40% compared with that of an aluminum alloy rudder wing; the rudder wing is made of a glass fiber composite material and has good wave-transparent performance, the surface of the rudder wing is subjected to appearance treatment through fluorocarbon paint, and the requirements for corrosion resistance, aging resistance and wave-transparent related performance are improved.

The present invention provides a ceramic radome, comprising at least one functional layer, the functional layer comprising a ceramic substrate and a conductive layer, the conductive layer comprising a plurality of non-connected cross-shaped conductive geometric structures; wherein the ceramic substrate and the conductive layer enable the ceramic radome to have such electromagnetic characteristics: when electromagnetic waves pass through the radome, the electromagnetic wave penetration rate is greater than 90% within the operating frequency range. The radome using the technical solution of the present invention adopts a ceramic-based material and can be used in a high-temperature environment, and adopts a conductive geometric structure in the functional layer to improve the wave transmittance, thereby having a high wave transmittance within a wider operating frequency range.

The invention relates to a high-temperature-resistant wave-transparent hole sealing coating and a preparation method thereof. The coating is compounded by taking fluorine-containing polyamide acid as a carrier, nano silicon dioxide as a hole sealing filler and a two-component organic solvent as a diluent and adding functional aids such as a dispersing agent, a defoaming agent and a flatting agent. The preparation method of the coating comprises the following steps: firstly, preparing a nano silicon dioxide dispersion liquid, and then sequentially adding fluorine-containing aromatic diamine and 3, 3 '-diaminodiphenylmethane into the dispersion liquid; the high-temperature-resistant wave-transparent hole-sealing coating is prepared by adding fluorine-containing polyamide acid into nano silicon dioxide, adding 3, 3 ', 4, 4'-benzophenonetetracarboxylic dianhydride, stirring and reacting to obtain a high-viscosity nano silicon dioxide / fluorine-containing polyamide acid mixed glue solution, finally adding an organic solvent and a functional additive, and mixing and stirring uniformly to obtain the high-temperature-resistant wave-transparent hole-sealing coating. A coating layer formed by high-temperature curing of the coating has excellent temperature resistance, hole sealing property and hydrophobic property, can overcome the surface porous defect of a high-temperature-resistant resin-based wave-transparent composite material and reduce the water absorption rate of the high-temperature-resistant resin-based wave-transparent composite material, and in addition, the coating layer also has excellent wave-transparent property and adhesive force.

The utility model relates to a polygonal unit piece structure of a radar radome. The polygonal unit piece structure comprises a polygonal foam interlayer unit piece body and joint edges on the periphery of the polygonal foam interlayer unit piece body, a polygonal foam interlayer unit piece body is of a foam interlayer structure, an inner layer and an outer layer are glass fiber composite board skins, a core layer between the inner layer and the outer layer of the glass fiber composite board skins is polygonal foam, and the inner layer and the outer layer of the glass fiber composite board skins extend to joint edges. A glass fiber reinforced plastic reinforcing plate is arranged between the inner-layer glass fiber composite plate skin and the outer-layer glass fiber composite plate skin at the joint edge, and a mounting position is reserved on the joint edge. According to the utility model, the base material is the flame-retardant resin, so that the radar radome adopting the structure has fewer parallel edges and joint splicing seams, and has good wave-transparent performance. The utility model has the advantages of simple structural form, low manufacturing difficulty and convenience in processing, manufacturing and mounting, and is suitable for various large-scale radar radomes.

This invention relates to the fields of radio frequency detection and aircraft skin technology, and discloses a conformal skin radar structure based on a radio frequency microsystem. It includes several planar arrays based on the radio frequency microsystem, assembled according to the curvature requirements of aircraft skin to form irregularly shaped arrays. A conformal skin is attached to the surface of each irregularly shaped array, including an outer electromagnetic wave-transmitting protective skin. A filling portion is provided on the side of the protective skin that is in contact with the irregularly shaped array, and the filling portion is inserted into the splicing seam between adjacent planar arrays. This invention utilizes the integrated design of the irregularly shaped outer electromagnetic wave-transmitting protective skin and the irregularly shaped array based on the radio frequency microsystem. While ensuring electrical performance, it achieves conformal design with the aircraft skin, expanding the installation location of radar equipment on aircraft platforms. Furthermore, the structure is simple and compact, lightweight, easy to manufacture, and inexpensive. Moreover, the filling portion ensures the installation stability of the conformal skin and the irregularly shaped array while improving the electromagnetic performance of the combined irregularly shaped array.

The application provides a high and low temperature resistant, acid and alkali resistant, and radiation resistant wave-transparent polyphenylene sulfide composite material, which is made of the following raw materials in parts by weight: polyphenylene sulfide resin 40-65 parts, high-density polystyrene resin 10-25 parts, low-dielectric glass fiber 15-35 parts, compatibility agent 3-8 parts, low-dielectric filler 10-25 parts, lubricant 1-3 parts, compatibilizer 3-6 parts, and antioxidant 1-2 parts. The application also discloses a preparation method of the wave-transparent polyphenylene sulfide composite material. The wave-transparent polyphenylene sulfide composite material provided by the application can meet the strict requirements of performance of wave-transparent materials in special environment fields such as aerospace, intelligent driving of automobiles, 5G / 6G communication and chemical industry.

The utility model discloses a high-wave-transparent environment-friendly Beidou antenna protective film, which comprises a film body, a mounting hole, a substrate, a centering piece, a flange plate and a Beidou antenna, the film body is of a multi-layer structure and is composed of a core layer, a skin and an anti-corrosion layer, the core layer is made of a honeycomb core material, the skin is made of an ASA / PC resin chemical material, and the anti-corrosion layer is made of a polytetrafluoroethylene material; the layers are bonded together through a high-temperature adhesive film to form a film body which is high in wave transmission rate, high in corrosion resistance, economical and environment-friendly; and the film body is connected with the centering piece through the flange plate, so that the high-wave-transmission environment-friendly Beidou antenna protective film is formed. The wave-transparent ceramic tile has the advantages of being high in wave-transparent rate, high in corrosion resistance, economical, environment-friendly and the like.

The invention provides a phenolic resin-based honeycomb sandwich composite material structure damage repair method. The method comprises the following steps: treating a repair area; a repairing material is prepared, the repairing material comprises a honeycomb core and a glue film, the honeycomb core is formed by adjusting the viscosity of an F01-36 phenolic resin glue solution to be 35-50 s through absolute ethyl alcohol, immersing a honeycomb core material GH-1 into the prepared glue solution and conducting heating curing, and the glue film is obtained by coating a flat plate tool with an X98-14 phenolic resin glue solution; brushing a glue bump on the damaged part by using an X98-14 glue solution, arranging a glue film and a honeycomb core, and impregnating the X98-14 glue solution by using alkali-free glass cloth for laying; preparing a vacuum bag on the repair surface and curing under a vacuum condition; performing surface shaping and polishing; and recovering the surface coating according to the surface coating requirement of the product. The special material combination of the phenolic resin glue solution, the glass fiber fabric and the honeycomb core material and the matched curing process are adopted, operation is convenient and fast, the repairing efficiency is high, the method is suitable for external field first-aid repair, the structural strength of the product can be guaranteed, and the product is light in mass and good in wave permeability.

The invention discloses a SiON micro-nanofiber membrane with both electromagnetic wave transmission and high-temperature heat insulation as well as a preparation method and application thereof, and relates to the technical field of ceramic fibers. The fiber membrane is formed by overlapping SiON micro-nano fibers; the arrangement mode of the SiON micro-nano fibers in the fiber membrane is disordered or oriented; the diameter of the SiON micro-nano fiber is 100 nm to 1.3 [mu] m; in the SiON micro-nano fiber, the content of Si element is more than 35 at.%, the content of O element is more than 30 at.%, the content of N element is more than 12 at.%, and the content of C element is less than 7 at.%. The prepared SiON fiber membrane has the micro-nano fiber diameter (100-1200 nm), low carbon and amorphous component / structure characteristics, shows the characteristics of light weight, porosity, wave transmission, heat insulation, high-temperature stability and the like, and is a novel wave transmission and heat insulation integrated fiber material with wide application prospects.