292 results about "Electromagnetic interference shielding" patented technology

Methods, systems, and apparatuses for grounding of integrated external electromagnetic interference (EMI) shields are provided. A portion of a module substrate, different from a circuit board substrate, may protrude past the module as a location for one or more grounding pads to which the EMI shield is grounded. The EMI shield may cover at least a portion of the thickness of the module substrate. The EMI shield may be comprised of one or more parts, which may be coupled to one another. The module substrate may include conductive vias. The EMI shield may include a sprayed and / or printed coating. The EMI shield may include a darkened coating.

A self-adaptive electromagnetic interference shielding and signal enhancement system belongs to the field of electronics and communication and comprises a signal feature analysis module, a dynamic shielding design module, a signal enhancement module, an intelligent adjustment module and a feedback adjustment module. According to the invention, the shielding effect and the signal enhancement strategy can be dynamically adjusted according to the change of the real-time electromagnetic environment. The intensity, the frequency and the position of an interference signal are monitored in real time through spectrum analysis and a multi-mode sensing technology. An intelligent material or a tunable structure is used to dynamically adjust electromagnetic parameters of a shielding material, and an efficient shielding effect is achieved. Various types of electromagnetic interferences, including high-frequency, low-frequency and transient interferences, can be effectively suppressed. Through a multi-sensor fusion technology, types and features of interference sources are accurately identified, and targeted shielding is realized. In a complex electromagnetic environment, a plurality of interference sources can be processed at the same time, and signal distortion or loss is avoided.

A semiconductor package includes a substrate having a top surface and a bottom surface, and a vertical sidewall extending between the top surface and the bottom surface; an integrated circuit die mounted within a device region on the top surface of the substrate; a metal interconnect structure embedded within the device region of the substrate, wherein the integrated circuit die is electrically connected to the metal interconnect structure; and a peripheral shielding ring embedded within a peripheral region of the substrate. The peripheral region surrounds the device region. A lid is mounted on the top surface of the substrate. The lid is electrically connected with the peripheral shielding ring.

The invention relates to a 3D printing preparation method of a high-absorption electromagnetic shielding composite material with a gradient structure. The 3D printing preparation method comprises the following steps: adding Fe3O4 and CNT into a dimethyl sulfoxide solution, fully shaking up, carrying out ultrasonic dispersion treatment, continuously adding TPU particles, continuously mechanically stirring at room temperature, and adding different CNT contents as required to prepare various Fe3O4 / CNT / PU composite ink; sequentially inputting various Fe3O4 / CNT / PU composite inks into a 3D printer, performing extrusion printing in a coagulating bath to obtain a composite frame, soaking and washing the composite frame with deionized water, and performing constant-temperature drying to obtain a composite frame with a porous structure; the composite frame and the high-conductivity flexible MXene film are bonded and cured through a polyurethane solution, and the composite material is obtained. Therefore, the problem of serious secondary electromagnetic radiation pollution caused by the electromagnetic wave (EMW) reflection characteristic of the existing conductive electromagnetic interference shielding composite material is solved.

Systems, methods, and computer-readable media are disclosed for capacitive touch sensing using system-in-package components and batteries. In one embodiment, a device may include a flexible printed circuit, a button cell electrically coupled to the flexible printed circuit, and a system-in-package that is electrically coupled to the flexible printed circuit. The system-in-package may include an electromagnetic interference shield, and a capacitive touch sensor. The capacitive touch sensor may be configured to detect a change in capacitance via a change in electric field at the electromagnetic interference shield.

An assembly is provided which includes a package and a printed circuit board. The package includes a housing bounding a region and an acoustic sensor within the region. The housing includes a base with a first hole. The sensor is configured to generate signals indicative of sound received by the sensor through the first hole. The printed circuit board is in mechanical communication with the base and includes a second hole aligned with the first hole such that sound received by the second hole propagates through the first hole to the sensor. The printed circuit board further includes an electrically conductive layer, at least a portion of which extends across the second hole and is configured to allow the sound to propagate through the second hole and to at least partially shield the region containing the sensor from electromagnetic interference.

The invention belongs to the technical field of intelligent soft materials, and particularly relates to a tough electromagnetic interference shielding hydrogel material and a preparation method and application thereof.The preparation method comprises the following steps that S1, chitosan, acrylic acid, a cross-linking agent, a thermal initiator and MXene dispersion liquid are added into water, and a mixed solution is obtained; s2, carrying out ultrasonic dispersion treatment on the mixed solution, uniformly mixing in a vacuum environment, and degassing to obtain a reaction solution; s3, heating the reaction liquid to enable acrylic acid in the reaction liquid to be subjected to thermal polymerization to generate MXene / polyacrylic acid-chitosan composite hydrogel; through construction of a double-network structure and salting-out treatment, the mechanical property of the hydrogel is greatly improved, so that the hydrogel has relatively high strength and fracture toughness; a proper amount of MXene is added and salting-out treatment is carried out, so that the conductivity and electromagnetic interference shielding performance of the hydrogel are improved, and the prepared hydrogel has excellent mechanical property, electromagnetic shielding performance and electrical (strain sensing) performance and has an obvious and good resistance-strain effect.

The present disclosure is directed polymer-free, non-composite densified carbon nanotube (DCN) structures from thin carbon nanotube (CNT) films and methods of making the same. CNT thin films can be cut, folded, stacked and pre-arranged in the form of cylinders, discs, domes, frames, gaskets, jars, rings, sacks, seals and sheets on a smooth reaction vessel surface and subsequently densified with the use of chlorosulfonic acid (HClSO3) at elevated temperatures. The disclosed DCN structures can be used as EMI shielding, lightweight structural and functional components in extreme conditions commonly encountered in space exploration, polar expeditions and military operations, and also as hydrophilic filtration media that resist surface fouling and provide high flux.

The utility model provides a display panel, a display module and a display device. The display panel comprises a first area used for arranging a driving chip, and a first protection layer is arranged on one side of the first area; in the first direction, the first protective layer sequentially comprises a first insulating layer and a first electromagnetic interference shielding layer; in the second direction, the first insulating layer and the first electromagnetic interference shielding layer are the same in size, and the second direction is perpendicular to the first direction. According to the technical scheme, the electrostatic discharge protection capability of the display device can be improved, and then the probability that the display device is damaged is reduced.

A battery pack with electromagnetic compatibility (EMC) for an electric vehicle is presented that includes a battery pack housing, at least one battery module enclosed within the battery pack housing, and an electronics assembly enclosed within the battery pack housing, in which the electronics assembly comprises a DC-DC converter and an electronics assembly casing, wherein at least one of the electronics assembly and battery pack housing includes an electromagnetic interference (EMI) shield to enable EMC. The electronics assembly includes a battery management system (BMS) circuit board and a DC-DC converter control circuit board and a DC-DC converter power electronics board. The electronics assembly is of substantially a same dimension of a battery module, in which the EMI shield comprises at least one of a metallic screen, metallic wires, a metallic tape, a metallic sheet, a metallic coating, paramagnetic materials, carbon based materials and metallic and / or carbon particle-infused composites.

The present disclosure provides an on-board power supply device (1) The on-board power supply device includes a housing and an electromagnetic interference shielding element (2), wherein the housing includes a cover (11) and a wall (12), the wall (12) separates two adjacent spaces in the housing, and the electromagnetic interference shielding element (2) is arranged between the cover (11) and the wall (12) and is in electrically conductive contact with the cover (11) and the wall (12). The present disclosure also relates to a vehicle including the on-board power supply device.

A paddle card includes a printed circuit board (PCB), a shielded cable, and an electromagnetic interference (EM) shield. The PCB includes a first metal layer on a top surface of the PCB, a second metal layer within the PCB, and a cavity in the top surface of the PC. The cavity exposes the second metal layer. The first metal layer includes a first ground pad. The second metal layer includes a signal pad located within the cavity. The shielded cable includes a signal conductor coupled to the first signal pad. The EMI shield is coupled to the ground pad and covers the cavity.

A motor assembly includes a brushless electric motor including a motor stator and a motor rotor configured for rotating within the motor stator. The motor stator includes a plurality of windings. The brushless electric motor also includes a rotor shaft non-rotatably connected to the motor rotor for rotating with the motor rotor and a resolver position sensor including a resolver stator and a resolver rotor configured for rotating within the resolver stator. The resolver rotor is non-rotatably connected to the rotor shaft for rotating with the rotor shaft. The resolver stator generates a signal based on a rotational position of the resolver rotor. The brushless electric motor also includes a rotor shaft bearing coupled to the rotor shaft and a bearing support supporting the rotor shaft bearing to allow the rotor shaft to rotate with respect to the bearing support. The bearing support is or includes an electromagnetic interference shield to reduce or block electromagnetic waves emitted by the windings of the motor stator from interfering with the signal generated by the resolver stator.

A laminate transformer includes a multilayer substrate having at least first, second, third, and fourth metal layers. The second metal layer and the third metal layer are separated by a voltage barrier having a thickness. A first multiloop coil has at least a first loop on the first metal layer and at least a second loop on the second metal layer. A second multiloop coil has at least a third loop on the third metal layer and at least a fourth loop on the fourth metal layer. A partial EMI shield for the first multiloop coil is on the second metal layer. A partial EMI shield for the second multiloop coil is on the third metal layer.

The invention relates to the field of anti-electromagnetic interference, in particular to an anti-electromagnetic interference method for a field inspection device of a transformer monitoring device, which comprises the following steps of: actually measuring a transformer substation, and performing simulation excitation processing by utilizing environmental interference data of the transformer monitoring inspection device to obtain an electromagnetic interference shielding simulation result of the transformer monitoring inspection device; acquiring a high-frequency electromagnetic noise suppression result of the transformer monitoring and checking device based on Matlab by taking the environmental interference data as an excitation condition; and performing verification processing on the electromagnetic interference shielding simulation result and the high-frequency electromagnetic noise suppression result of the transformer monitoring and checking device to obtain an anti-electromagnetic interference result of the transformer monitoring and checking device. The acquisition precision of sensing signals and the stability of data transmission are effectively improved.

The invention relates to the technical field of electromagnetic shielding materials, and discloses an anti-electromagnetic interference high-frequency lightweight nano new material, which is composed of 10-35% of graphene quantum dots, 5-20% of multi-walled carbon nanotubes, 5-20% of ferrite nanoparticles and 10-30% of a polymer matrix. The content of the ferrite nanoparticles is 15%-25%, and the content of the polymer matrix is 40%-55%; according to the composite material, through the synergistic effect of the graphene quantum dots, the multi-walled carbon nanotubes and the ferrite nanoparticles, the electromagnetic shielding effectiveness, the mechanical strength, the thermal stability and the lightweight property of the composite material are remarkably improved, and the composite material is particularly suitable for the fields of high-frequency electronic equipment, communication equipment and aerospace; the material has good processability, stable performance and efficient electromagnetic interference shielding capability, and can meet the requirements of modern high-frequency equipment on light, high-temperature-resistant and efficient shielding materials.

Provided is a housing comprising, a plastic assembly comprising a plastic “B” cover having one or more snap on plastic hooks protruding therefrom and one or more grooves cut therein, a display panel sandwiched into the plastic assembly behind the plastic “B” cover, in front of an electromagnetic interference shielding (EMI) material, and a plastic “A” cover having one or more grooves cut therein, the plastic assembly held together by one or more clips sliding along each side of the plastic assembly, and within the one or more grooves of the plastic “B” cover and one or more snap on plastic hooks and the one or more grooves of the plastic “A” cover, the EMI material has one or more press-on grommets which are pressed onto one or more plastic buttons protruding from a surface of the plastic “A” cover to secure the EMI material to the plastic “A” cover.

In one embodiment, a housing is coupled to a device connector (e.g., an M.2-compatible expansion slot) on a circuit board. The housing may be a conductive material (e.g., metal) and sized to cover a device coupled to the connector such that the device may be substantially encompassed by the housing and the circuit board. The housing may contact, directly or indirectly, the device to provide thermal transfer. In addition, the housing may be connected to ground to provide electromagnetic interference (EMI) shielding of the device.

The present disclosure provides an electromagnetic interference testing system and method for an electric automobile under dynamic working conditions. The method includes the steps of: estimating electromagnetic interference presence state information about each of all wiring harnesses connected to a motor driving device based on operation state data, and identifying an abnormal wiring harness in which a signal conduction interference event occurs; tracking and identifying an electromagnetic interference signal of the abnormal wiring harness to obtain propagation path information, and determining, based on this, an electronic device which may be affected by the electromagnetic interference signal inside the electric automobile; and determining whether an operation disorder event occurs in the electronic device, and determining an electromagnetic interference concentrated circuit interval inside the electronic device, which is convenient for subsequent electromagnetic interference shielding processing for corresponding circuit intervals.

Composite materials for simultaneous thermal management and electromagnetic interference screening of radiofrequency-based electronic systems are provided. The materials contain a phase change material and one or more electrically and thermally conductive filler particles. The materials provide a passive system for thermal management and EMI shielding that is lightweight, does not contain moving parts, and does not require an external power supply.

Provided is a consolidated plastic human-machine interface (HMI) chassis comprising: one or more input devices, adjacent to electromagnetic interference (EMI) shielding material, the one or more input devices and electromagnetic interference (EMI) shielding material heat staked with a plurality of plastic heat stakes to a printed circuit board (PCB). The consolidated plastic human-machine interface (HMI) chassis may improve a variety of electronic devices such as laptops, tablets, notebooks, desktop computers, televisions, gaming devices, advertising displays, and others.

The invention discloses a bacterial cellulose / silver nanowire / MXene composite conductive film and a preparation method thereof, and relates to the technical field of flexible conductive materials. The composite film comprises a bacterial cellulose substrate, an MXene conductive layer and a silver nanowire conductive network layer. The preparation method comprises the following steps: S1, preparing bacterial cellulose dispersion liquid; s2, preparation of an MXene dispersion liquid; s3, preparing a silver nanowire dispersion liquid; and S4, preparing the composite film. The composite film with a Janus structure is prepared through a vacuum-assisted layer-by-layer filtering process, and the composite film has high mechanical performance, low square resistance, excellent electromagnetic interference shielding effectiveness, rapid Joule heating performance and excellent environmental stability and mechanical durability. The problem that an existing flexible electromagnetic shielding material is difficult to consider ultrathin performance, high flexibility, strong mechanical performance and multifunctional integration is solved, and the flexible electromagnetic shielding material has wide application prospects in the fields of electromagnetic shielding, flexible electronic devices, wearable heaters and the like.

The present technology provides a curable silicone-based composition comprising a curable silicone polymer, a catalyst, an electrically conductive filler, and carbon nanostructures. The combination of the electrically conductive filler and the carbon nanostructures provide a cured material that exhibit good electrical conductivity and electromagnetic interference shielding.

Apparatuses relating generally to a microelectronic package having protection from electromagnetic interference are disclosed. In an apparatus thereof, a platform has an upper surface and a lower surface opposite the upper surface and has a ground plane. A microelectronic device is coupled to the upper surface of the platform. Wire bond wires are coupled to the ground plane with a pitch. The wire bond wires extend away from the upper surface of the platform with upper ends of the wire bond wires extending above an upper surface of the microelectronic device. The wire bond wires are spaced apart from one another to provide a fence-like perimeter to provide an interference shielding cage. A conductive layer is coupled to at least a subset of the upper ends of the wire bond wires for electrical conductivity to provide a conductive shielding layer to cover the interference shielding cage.

The present invention relates to ink formulations based on silver nanoparticles which can be advantageously used for electromagnetic interference ("EMI") shielding coatings of semiconductor chips, in particular epoxy molding compound ("EMC") chips; in particular, the present invention relates to such silver nanoparticle-based ink formulations which are stable, have improved electrical conductivity and are particularly suitable for application by spraying.

An electronic device includes at least a first radio frequency (RF) path structure and a second RF path structure; and an electromagnetic shield disposed between the first RF path structure and the second RF path structure. The electromagnetic shield comprises a plurality of fence posts extending through at least one dielectric layer and having first ends electrically connected to a common ground metallization layer, and at least one metallization layer overlying the at least one dielectric layer and electrically interconnecting second ends of the plurality of fence posts. The at least one metallization layer interconnects the second ends of the plurality of fence posts in a conductive mesh pattern.

In various embodiments, the present application provides electrically conductive metal-plated fibers and continuous processes of preparing metal-plated fibers. Additionally, provided are polymeric articles comprising the provided metal-plated fibers or other fibers prepared by the provided process, said articles having electromagnetic interference shielding effectiveness.

The utility model relates to the technical field of circuit boards, in particular to a circuit board electromagnetic interference shielding structure which comprises a positioning installation strip block and a circuit board body, a limiting sliding groove is formed in the side wall of the positioning installation strip block, and a clamping driving assembly is installed in the limiting sliding groove. A first clamping and positioning strip block and a second clamping and positioning strip block are installed on the clamping driving assembly, the first clamping and positioning strip block and the second clamping and positioning strip block are connected to the two sides of the circuit board body in a clamped mode and used for clamping and fixing the circuit board body, and installation sliding grooves are formed in the tops of the first clamping and positioning strip block and the second clamping and positioning strip block correspondingly; a movable adjusting assembly is installed in the installation sliding groove, a U-shaped shielding plate is installed on the movable adjusting assembly, and the circuit board body is covered with the U-shaped shielding plate. The position of the U-shaped shielding plate can be flexibly adjusted according to the size of the circuit board body, comprehensive coverage is ensured, electromagnetic interference is effectively shielded, meanwhile, circuit board bodies of different sizes can be stably installed, and practicability is higher.