31results about How to "Improve electromagnetic shielding efficiency" patented technology

The invention discloses a silver-plated conductive aramid paper and a preparation method thereof. The preparation method is as follows: a. cleaning the aramid paper substrate with a cleaning agent to remove surface impurities and drying; b. cleaning the cleaned aramid paper substrate Carry out plasma treatment to obtain a surface-activated aramid paper substrate; c. Put the plasma-treated aramid paper substrate into the silver ammonia solution, and after activation for a certain period of time, slowly drop the reducing agent into the above solution, and react for a certain period of time Afterwards, the aramid paper substrate is taken out, fully washed with deionized water and dried, and finally a silver-plated conductive aramid paper is obtained. The mass ratio of silver content in the prepared conductive aramid paper is 3%-12%, and has good electrical conductivity and electromagnetic shielding performance, and the preparation process is simple and the operation is convenient.

The invention discloses a weaving process for anti-electromagnetic-radiation air layer weft knitted fabric. The front and back surfaces of the knitted fabric are weaved through a weaving machine by using cotton or cotton-polyester blended fabric as raw materials. Tissue of the fabric is produced by a double-sided dobby air layer structure. The stainless steel filaments are weaved in a doubling manner into the knitted fabric. The stainless steel filaments are formed on the front surface of the fabric in a manner of locally forming a ring. Float length between adjacent stainless steel filamentsis in the air layer structure. The invention has the advantages of high electromagnetic shielding efficiency, strong performance of anti-electromagnetic-radiation, soft feel, wrinkle-free property and launderability.

The double-layer staggered orthogonal tangent ring and inscribed sub-ring array electromagnetic shielding optical window belongs to the field of electromagnetic shielding technology. The electromagnetic shielding optical window is composed of two layers of metal mesh grids that are rotated and staggered and loaded on both sides of the light window. Each layer of metal mesh The grids are composed of metal rings of the same diameter that are circumscribed and connected in an orthogonal arrangement, and are arranged in close contact with each other. Each ring has a sub-ring that is inscribed with the ring; At the junction with the inscribed connected sub-rings, overlap the lines or set metals to ensure reliable electrical connection between the tangent points of the metal rings, so as to ensure that all the rings are connected to each other and conduct electricity. By selecting the staggered angle of the double-layer grid, the metal grid structure of the present invention can significantly reduce the inhomogeneity of the high-level diffraction light intensity distribution of the grid, make the distribution of stray light caused by diffraction more uniform, and have less impact on imaging; Appropriate substrate thickness can obtain good electromagnetic shielding efficiency.

The invention discloses an electromagnetic shielding light window of a double-layer interlaced multi-cycle metal ring embedded array and belongs to the technical field of electromagnetic shielding. The electromagnetic shielding light window is formed by arranging two layers of metal grids in a rotating and interlaced mode and loading the two layers of metal grids on the two sides of a light window transparent substrate or a substratum. Each layer of metal grid is formed by densely arranging and connecting a set of concentric metal rings and another metal ring with the different diameter in an equilateral triangle mode, and the metal grids are distributed and loaded on the surface of the light window transparent substrate or the substratum in a crossed mode. The adjacent rings with the same diameter are communicated in an external tangent mode. The concentric rings are aligned with the external rings to serve as basic rings which are internally provided with metal sub rings communicated with the concentric rings in an internal tangent mode. Lines are overlapped at the joints where the rings are communicated in a tangent mode or metal which ensures reliable electric connection between the points of tangency of the metal rings is arranged at the joints where the rings are communicated, and therefore it is ensured that all the rings are mutually conducted. Through selection of interlaced angles of the double layers of grids, the structure of the metal grids of the electromagnetic shielding light window can effectively reduce non-uniformity of high-level diffraction light intensity distribution of the grids, and therefore stray light generated by diffraction can be distributed more evenly, and influences on imaging are less.

The invention discloses a heat-generating electromagnetic shielding plastic-based composite material, which is composed of the following raw materials in parts by mass: 40-70 parts of plastic matrix, 10-45 parts of ferrous metaferrite, 10-30 parts of Composite carbon black, 5-10 parts of compatibilizer, 0.5-1 part of lubricant, 0.5-1 part of antioxidant, described compatibilizer is POE-g-MAH, ABS-g-MAH A sort of. The composite material prepared by the invention has good mechanical properties and electromagnetic shielding properties, and the inner surface temperature is 60°C within 3-5 seconds under 60V voltage, the calorific value is controllable, the heating is faster, the electromagnetic shielding efficiency is high, the cost is low, and it is easy to form It can be processed and recycled, and can also meet the requirements of environmental protection, and realize the country's strategic deployment of building a resource-saving and environment-friendly society.

The invention discloses an infrared transparent window with an electromagnetic shielding function. The infrared transparent window is prepared from a sapphire substrate and an ITO (indium oxide) basedsemiconductor film lamination located above the sapphire substrate with a metal organic chemical vapor deposition method, wherein a deviation angle of 0-2 degrees is formed between the surface of thesapphire substrate and the c crystal face of sapphire, and the sapphire substrate is subjected to double-sided polishing, and the thickness of the sapphire substrate is 100-10000 mu m; the ITO basedsemiconductor film lamination is prepared from an unintentionally doped ITO buffer layer and an Sn-doped ITO electromagnetic shielding main body layer by laminating; the thickness of the unintentionally doped ITO buffer layer is 10-1000 nm, and electron mean concentration is not higher than 1*10<19>cm<-3>; the thickness of the electromagnetic shielding main body layer is 0.2-200 mu m, and electronmean concentration is not higher than 5*10<19>cm<-3>. Square resistance of the infrared transparent window is lower than 100 omega / sq, the transmittance of the infrared transparent window in a wavelength range of 0.78-2.5 mu m is higher than 70%, the transmittance of the infrared transparent window in a wavelength range of 2.5-5 mu m is higher than 50%, electron mobility is higher than 70 cm<2> / Vs, and electromagnetic shielding efficiency in a frequency range of 1-18 GHz is higher than 12 dB.

A dual-layer metal mesh strong electromagnetic shielding optical window possessing graphene interlayers and dual external absorption layers belongs to the optical transparent member electromagnetic shielding technology field. The core devices of the electromagnetic shielding optical window are first, second and third transparent absorption layers and a transparent reflection layer, the first and third transparent absorption layers are both composed of 1-6 layers graphene films separated by the transparent mediums, the second transparent absorption layer is composed of 1-3 layers of graphene films separated by the transparent mediums, and the metal meshes A and B form the transparent reflection layer. The first and third transparent absorption layers are placed at the two sides of the transparent reflection layer respectively, and the second transparent absorption layer is placed between the metal meshes A and B. The dual-layer metal mesh strong electromagnetic shielding optical window possessing the graphene interlayers and the dual external absorption layers solves the problem that a conventional transparent electromagnetic shielding method can not consider the low-electromagnetic reflection, the bidirectional strong electromagnetic shielding and the high light transmission simultaneously, and has the characteristics of high light transmission performance, bidirectional strong electromagnetic shielding and low electromagnetic reflection.

A bidirectional wave absorption strong electromagnetic shielding optical window of a multilayer graphene mesh / metal mesh laminated structure belongs to the optical transparent member electromagnetic shielding technology field. The electromagnetic shielding optical window utilizes the different light transmission and microwave shielding characteristics performed by the graphene mesh films when the graphene mesh films have different mesh unit hole area ratios to organically combine the low-reflection and partial absorption microwave characteristics of the graphene mesh films with the strong electromagnetic reflection characteristics of the high-light transmission dual-layer metal meshes, and the multilayer graphene mesh films are placed at the two sides of the dual-layer metal meshes to form a multilayer structure. The dual-layer metal meshes separated by the graphene mesh films are used as the transparent reflection layers, and the graphene mesh films separated by the transparent mediums are used as the transparent absorption layers. By the structure, the radio frequency radiation at the two sides of the optical window can penetrate the absorption layers simultaneously and repeatedly to be absorbed strongly, so that the bidirectional strong shielding and low-reflection characteristics are realized, the visible light has a high light transmission rate by transmitting the laminated structure once. The electromagnetic shielding optical window solves the problem that a conventional transparent electromagnetic shielding method can not consider the bidirectional low-electromagnetic reflection, the strong electromagnetic shielding and the high light transmission simultaneously.

The invention relates electromagnetic screen complex film made by electric polyaniline and carbon nano pipe and preparing method. The method comprises the following steps: dispersing the carbon nano pipe into chloroform tobacco extract mixed with 4-dodecylbenzene sulfonic acid, then mixing it with polyaniline m-cresol solution doped with camphor sulfonic acid to form filming solution, pouring the filming solution on the slide glass, getting the complex film of polyaniline and carbon nano pipe whose concentration is 5wt%-50wt% in form filming solution. The optimum electric conductivity of complex film is 212 S / cm and mechanics intensity is 14.53Mpa. When the frequency of complex film is between 106Hz and 109Hz and thickness of complex film is 20mum, the electromagnetic screen efficiency is between 35dB and 40dB. The more the electric conductivity and thickness of complex film, the higher the electromagnetic screen efficiency.

The invention discloses a mining instrument thin-film button switch and a shielding layer making method thereof. The thin-film button switch is composed of a printed circuit board and a thin-film button panel covering the printed circuit board. The printed circuit board is composed of a ground wire layer, a power layer and a plurality of signal layers in sequence from bottom to top. A TVS power protector is connected between the ground wire layer and the power layer. The thin-film button panel is composed of a first protective layer, a PET substrate, a pattern layer, a shielding layer, a second protective layer, a conductive adhesive layer and a button pad layer in sequence from top to bottom. The ground wire layer of the printed circuit board is connected with the shielding layer of the thin-film button panel. The TVS power protector is connected in parallel between the power layer and the ground wire layer to reduce instantaneous electromagnetic interference and protect the thin-film button switch.

The electromagnetic shielding light window of the orthogonal ring array with two sets of circumscribed rings and sub-rings belongs to the field of electromagnetic shielding technology, and the basic rings of different diameters, the connecting rings and the filling rings are closely arranged to form a metal grid and loaded on the light The surface of the transparent substrate of the window; the basic circular rings are arranged in two-dimensional orthogonal manner and separated from each other at equal intervals in the direction of the arrangement; The rings are connected by connecting units, and the gap between the basic ring and the connecting unit has a filling ring; the basic ring, the connecting ring and the filling ring are connected through circumcision to form the basic structure of the metal grid; Cutting connected sub-rings; at the tangent connection of the rings, overlapping lines or setting metals to ensure reliable electrical connection between the tangent points of the metal rings to ensure that all the rings conduct electricity with each other. The metal grid of the invention can significantly reduce the inhomogeneity of stray light distribution caused by grid high order diffraction.

The invention discloses a double-layer triangle and orthogonality mixed distribution tangent circular ring array electromagnetic shielding light window and belongs to the technical field of electromagnetic shielding. The electromagnetic shielding light window is composed of two layers of metallic meshes which are crossly arrayed at two sides of the light window, each layer of metallic mesh is composed of externally tangent connected metallic circular rings through firmly connecting and arranging according to equilateral triangle and two-dimensional orthogonality mixed arrangement, wherein the diameters of the externally tangent connected metallic circular rings are the same, each basic circular ring is provided with an internally tangent connected metallic sub-circular ring, and each basic circular ring and each internally tangent connected metallic sub-circular ring together make up a basic unit of a two-dimensional mesh array structure; the tangentially connected joints of the circular rings are overlapped through lines or are provided with metals which are capable of guaranteeing the reliable electric connection between the annular metal tangent points so as to make sure that all the circular rings are conductive. Through choosing the staggered angle of double layers of meshes, the metallic mesh is capable of obviously lowering the nonuniformity of the senior diffraction intensity distribution of the mesh, and accordingly the stray light caused by diffraction is distributed more uniformly, and the influence on the imaging is less; the electromagnetic shielding efficiency is high through choosing the proper substrate thickness.

A connector includes a base, a transmission interface, a shielding cover and a shielding layer. The base includes a slot. The transmission interface includes a clamping portion and a plugboard. The clamping portion is clamped in the slot and a portion of the plugboard protrudes out of the base. The shielding cover has an accommodation space and a shielding layer. The accommodation space is disposed to accommodate the base and the transmission interface, and the shielding layer is electroplated on an inner side surface of the shielding cover. The shielding cover covers the base and the transmission interface and is disposed to block electromagnetic waves generated by the transmission interface.

A dual-layer metal mesh electromagnetic shielding optical window possessing graphene mesh interlayers belongs to the optical transparent member electromagnetic shielding technology field and utilizes the different light transmission and microwave shielding characteristics performed by the graphene mesh films when the graphene mesh films have different mesh unit hole area ratios to organically combine the low-reflection and partial absorption microwave characteristics of the graphene mesh films with the strong electromagnetic reflection characteristics of the high-light transmission conductive films, thereby forming a multilayer structure. The dual-layer metal mesh electromagnetic shielding optical window is formed by assembling a first transparent absorption layer, a transparent medium A, a metal mesh A, a transparent medium B, a second transparent absorption layer, a transparent medium C and a metal mesh B which are orderly laminated and parallelly configured. The first transparent absorption layers is composed of N layers of graphene mesh films separated by transparent mediums, the second transparent absorption layers is composed of 1-6 layers of graphene mesh films separated by transparent mediums, and the metal meshes A and B form a transparent reflection layer. The dual-layer metal mesh electromagnetic shielding optical window possessing the graphene mesh interlayers of the present invention solves the problem that a conventional transparent electromagnetic shielding technology can not consider the low-electromagnetic reflection, the strong electromagnetic shielding and the high light transmission simultaneously, and has the characteristics of high light transmission performance, strong electromagnetic shielding and low electromagnetic reflection.