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 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 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 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 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 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.