8results about How to "Guaranteed electromagnetic shielding performance" patented technology

The invention provides nickel-carbon conductive shielding foam. The nickel-carbon conductive shielding foam sequentially comprises a conductive layer, foam, a bonding layer and an isolating layer from top to bottom, the foam comprises 25 to 40 parts of nickel-carbon nanotube-cerium oxide composite powder, 1 to 5 parts of an ionic liquid dispersant, 10 to 25 parts of organic silicone oil, 20 to 40 parts of silicone rubber, 5 to 10 parts of polyfuran, 5 to 10 parts of maleimide, 0.5 to 3 parts of a silane coupling agent, 0.01 to 0.1 part of a platinum catalyst and 0.2 to 1.5 parts of a cross-linking agent. The conductive foam can effectively restrain high-frequency electromagnetic interference generated in modern electronic equipment and ensure normal work of the equipment. A self-repairing system is constructed by adding polyfuran and maleimide. When the foam generates cracks under the action of mechanical stress or thermal cycle in the using process, the self-repairing material can automatically repair a conductive network through a reverse Diels-Alder reaction, and the shielding performance and the conductivity of the material are recovered.

The invention provides a preparation method of nickel-carbon conductive shielding foam, which comprises the following steps: S1, mixing carbon nanotubes and cerium oxide in proportion, and adding nano nickel powder to form a suspension; adding a reducing agent to carry out reduction reaction so as to deposit nickel ions on the surfaces of the carbon nanotubes and the cerium oxide particles; s2, mixing the nickel-carbon nanotube-cerium oxide composite powder with an ionic liquid dispersant, mixing organic silicone oil and silicone rubber to serve as a matrix, then adding polyfuran and maleimide, and adding a silane coupling agent to be fully combined; adding the dispersed composite powder into an organic silicon matrix, continuously stirring until the materials are uniformly mixed, then adding a platinum catalyst and a cross-linking agent, pouring the mixture into a mold, and curing to form foam; s3, pasting a conductive layer; S4, setting a bonding layer; and S5, setting an isolation layer. By adopting the nickel-carbon nanotube-cerium oxide composite material, the electromagnetic shielding performance of the foam is greatly improved. The ultra-thin self-repairing function is also realized.

A highly integrated wide- and narrow-band RF transceiver module includes a housing made of aluminum alloy with a flat structure. An upper cavity is formed with an opening on the housing's surface, and a lower cavity is formed with an opening on the lower surface of the housing. An upper control card and an upper partition are located at the bottom of the upper cavity, with the upper partition fixed to the bottom of the upper cavity by screws. Multiple compartments are formed on the upper partition. An upper cover is fixed to the upper end of the upper cavity. A lower control card and a lower partition are located at the bottom of the lower cavity, with the lower partition located below the lower control card and fixed to the bottom of the lower cavity. Multiple holes are formed on the lower partition, with electronic components on the lower control card located within each hole. A lower cover is fixed to the lower end of the lower cavity. This invention's dual-cavity design evenly distributes the gain in the RF link across both sides, achieving physical isolation and increasing electromagnetic shielding. Simultaneously, power amplifiers and RF front-end circuits arranged on the same side are physically isolated through the upper and lower partitions, ensuring electromagnetic shielding effectiveness.

The utility model discloses a heat conduction structure of an optical module. The heat conduction structure comprises a base, VC radiating fins and a radiator, the base is provided with a front surface, a back surface and a hollow opening penetrating through the front surface and the back surface; the VC cooling fin is arranged on one side of the back face of the base and provided with a first heat conduction face facing the base. A circle of continuous welding seam or a circle of shielding glue is arranged between the VC cooling fin and the base in the circumferential direction of the VC cooling fin. The radiator is arranged on one side of the front face of the base and provided with a second heat conduction face facing the base. The first heat-conducting surface and the second heat-conducting surface are in contact through the hollow-out opening, and a welding surface is formed between the two. The overall structure of the high-speed optical module is high in heat conduction capability, can guarantee electromagnetic shielding capability, and effectively meets the heat dissipation requirement and the electromagnetic shielding requirement of the high-speed optical module.

The invention discloses electronic equipment, and belongs to the technical field of electronics. The electronic equipment comprises a circuit board, a support, a bearing piece and an electric connecting piece, the circuit board is provided with a shielding piece, the shielding piece wraps at least part of components on the circuit board, and the shielding piece is electrically connected with a grounding circuit of the circuit board; the support and the bearing piece are located on the two opposite sides of the circuit board respectively and connected with the circuit board. The electric connecting piece and the shielding piece are arranged at intervals; the circuit board is provided with a through hole, the electric connecting piece comprises a connecting piece body and an elastic piece, the first end of the connecting piece body penetrates through the through hole and is connected with the first end of the elastic piece, one of the second end of the connecting piece body and the second end of the elastic piece is connected with the support, and the other one is connected with the bearing piece. And the electric connecting piece is electrically connected with the bracket and the bearing piece at the same time.

This utility model provides an on-board charger, relating to the field of new energy vehicle technology. The shielding cover provided by this utility model includes: a shielding plate, and a convex bridge and a support foot disposed on the shielding plate; the convex bridge protrudes relative to the surface of the shielding plate; the support foot bends relative to the shielding plate in a direction away from the protrusion of the convex bridge, and the support foot is used to connect the shielded device. The convex bridge can abut against and press against the electrical cover plate, which not only prevents the shielding cover from loosening and improves stability, but also ensures tight contact and grounding between the shielding cover and the electrical cover plate, possessing technical advantages such as stable shielding effect, ease of manufacture, and low production cost.

The invention discloses a power supply cable for large-span overhead laying and a manufacturing method of the power supply cable, solves the problem of insufficient electromagnetic shielding capability of a power supply cable in the prior art, and has the beneficial effect of ensuring the shielding performance of the power supply cable, and the specific scheme is as follows: the power supply cable for large-span overhead laying comprises a main wire core, a plurality of groups of wire cores are wound in the circumferential direction of the main wire core, the plurality of groups of wire cores comprise a neutral wire core group and a grounding wire core group, each neutral wire core in the neutral wire core group adopts a metal conductor layer to serve as a shielding structure of a neutral wire and a power supply cable, and the grounding wire core is wound along the winding direction of the plurality of groups of wire cores. At least one communication signal wire core is arranged on at least one side of the grounding wire core group, a tensile partition is arranged on at least one side of the communication signal wire core, a tensile piece is arranged in the tensile partition to ensure the tensile performance of the power supply cable, and the tensile piece is made of a material with an electromagnetic shielding effect.

The invention discloses an optical module which comprises a shell formed by covering and connecting a lower shell and an upper shell, and an optical fiber adapter is located on one side of a circuit board. And an optical port baffle plate is arranged between the first lower side plate and the second lower side plate of the lower shell. The lower shell is divided into a first cavity and a second cavity by the optical port baffle. A limiting groove is formed in the first side wall of the upper shell, and the positioning rod sequentially penetrates through the first lower side plate, the limiting groove and the second lower side plate to achieve connection and fixation of the upper shell and the lower shell. The upper shell covers the first cavity, and the upper shell, the first lower side plate and the second lower side plate are connected with the optical port baffle to block the opening part of the second cavity, so that the electromagnetic shielding effect is improved. The connection mode is simple, screws do not need to pass through the circuit board, and the area of the circuit board is reduced. The optical port baffle plate is provided with an adaptive through hole, one side of the adaptive projection of the optical fiber adapter abuts against one side of the optical port baffle plate, and optical fiber communication between the inside and the outside of the optical module is realized on the premise of ensuring the electromagnetic shielding effect.