66results about How to "Suppress electromagnetic radiation" patented technology

A display panel module such as a liquid crystal display (LCD) panel module in an electronic apparatus is designed to receive a driving signal of a predetermined frequency. An electrically conductive frame or bezel of the display panel module tends to suffer from the transmission of electromagnetic waves which are related to the wavelength of the driving signal. An electrically conductive member is located behind the display panel and electrically connected to the electrically conductive frame. The electrically conductive member serves to diverge the electromagnetic waves out of the electrically conductive frame. This divergence of the electromagnetic waves serves to suppress the electromagnetic radiation out of the electrically conductive frame.

The present invention relates to a multi-functional energy conditioner having architecture employed in conjunction with various dielectric and combinations of dielectric materials to provide one or more differential and common mode filters for the suppression of electromagnetic emissions and surge protection. The architecture allows single or multiple components to be assembled within a single package such as an integrated circuit or connector. The component's architecture is dielectric independent and provides for integration of various electrical characteristics within a single component to perform the functions of filtering, decoupling, fusing and surge suppression.

In a connector to be mounted to a connection object, an insulating housing holds a first and a second contact and has a receiving portion for receiving and holding a circuit board with an electronic element mounted thereon. The first contact has a first contacting portion to be contacted with a mating connector and a first elastic contacting portion brought into elastic contact with the circuit board. The second contact has a second contacting portion to be connected to the connection object and a second elastic contacting portion brought into elastic contact with the circuit board. Conductive first and conductive second connecting portions are disposed on the circuit board to be connected to the first and the second elastic contacting portions, respectively. In addition, a pair of ground patterns is disposed on the circuit board with the first and the second connecting portions interposed therebetween.

A differential transmission circuit includes a grounded conductive layer, a pair of transmission line conductors, a conductive film and a via hole which connects the grounded conductive layer to the conductive film. The differential transmission circuit further includes a straight-line region which is present in the differential transmission circuit through which a differential transmission signal output by a driving circuit is transmitted and in which the pair of transmission line conductors extends parallel so as to have a first width, and a band rejection filter region in which the pair of transmission line conductors planarly overlaps the conductive film and extends parallel so as to have a second width narrower than the first width and a common mode of the differential transmission signal is attenuated at one of the frequencies which are natural number multiples of a frequency corresponding to the predetermined bit rate.

In a printed circuit board of the invention, a first signal wiring layer, a first ground layer, a second ground layer and a second signal wiring layer are laminated via an insulating material. A first signal wiring is formed on the first signal wiring layer and a second signal wiring is formed on the second signal wiring layer. The two signal wirings are connected via a first through hole. The conductive first ground layer and the conductive second ground layer are connected via a second through hole. The second through hole is insulated from the first through hole and formed so as to surround the first through hole.

The invention discloses a radiation resistant mobile phone shell with the signal enhancement function and a manufacturing method of the radiation resistant mobile phone shell with the signal enhancement function, and belongs to the field of electronic device materials and application. The radiation resistant mobile phone shell comprises a mobile phone protection shell body, the inner side of the mobile phone protection shell body is coated with a radiation resistant coating, stainless steel powder is used as main shielding components of the radiation resistant coating, the particle sizes of the stainless steel powder range from 1 micrometer to 10 micrometer, and alcohol solubility phenolic aldehyde paint is used as base materials of the radiation resistant coating. Two external antennas are machined on the mobile phone protection shell body and used for being connected with a signal antenna and a Wi-Fi antenna of a mobile phone respectively. By means of the radiation resistant mobile phone shell, more than 70% of electromagnetic radiation of the mobile phone can be restrained; with the method that the external antennas are arranged, attenuation, caused by the radiation resistant coating, of signals of the mobile phone can be reduced to 5% from 30% generated when no external antenna is arranged, harm of electromagnetic wave radiation of the mobile phone to the human body is accordingly and effectively restrained, and meanwhile the conversion quality and the network quality of the mobile phone are guaranteed.

The invention discloses a slot waveguide theory-based electromagnetic radiation suppression structure and an application thereof. Periodic electromagnetic bang gap (EBG) structures are arranged between a packaging substrate and a heat dissipation packaging cover or between the packaging substrate and a radiator, so as to realize a boundary condition of PMC within the required frequency band to perform electromagnetic radiation suppression; specifically, the periodic electromagnetic bang gap structures refer to pin type two-dimensional metal EBG structures and mushroom type two-dimensional metal EBG structures which are in array and uniform distribution at intervals; and an air gap is formed between the electromagnetic bang gap structure and the packaging substrate, so that the distance between the bottom surface of the electromagnetic bang gap structure and the packaging substrate is less than 1 / 4 of corresponding wavelength of the center frequency of the working frequency bands. By adoption of the slot waveguide theory-based electromagnetic radiation suppression structure and the application thereof, the electromagnetic radiation in the working frequency bands can be effectively lowered, particularly, an obvious suppression effect is played on high-frequency electromagnetic radiation; miniaturization of design dimensions are realized; and the electromagnetic radiation suppression structure can be applied to packaging design of a chip, a printed circuit board and the like.

The invention provides an aerogel composite material with a heat insulation and stealth function and a preparation method of the aerogel composite material, and belongs to the technical field of aerogel composite materials. The aerogel composite material comprises a nano-fiber aerogel matrix layer, a nano-fiber aerogel conductive layer and a nano-fiber aerogel heat insulation layer. According to the invention, under the condition of not using an adhesive, the effective fixation of aerogel particles and the tight combination between the base material and each functional layer can be realized by utilizing the unique hydrophilicity and pore structure of the nanofibers, and the heat insulation performance of the base material layer and the heat insulation layer is utilized; the electromagnetic shielding and controllable heat transmission performance of the conducting layer can achieve the heat insulation and electromagnetic infrared double-shielding synergistic function, and the invention has application prospects in the fields of national defense military industry and functional textiles.

The invention relates to an electrode assembly of a low-temperature plasma generator. A positive electrode and A negative electrode of the electrode assembly are conductive metal wires. Insulating materials which resist electrical high voltage and chemical corrosion are coated or sheathed on the external surfaces of the conductive metal wires to form dielectric barrier layers. The same distance is kept between the positive electrode and the negative electrode. The positive electrode and the negative electrode form a positive and negative electrode pair according to a certain geometric shape. The positive and negative electrode pair is clamped and fixed by an insulating support. The positive and negative electrode pair of the electrode assembly is linear, elliptic or spiral. The positive electrode is arranged on the internal side of the electrode pair and the negative electrode is arranged on the external side of the electrode pair. The low-temperature plasma generator which is manufactured by using the electrode assembly has the outstanding advantages that the structural device is simple to manufacture, the spatial electromagnetic radiation is smaller, the energy conversion efficiency is higher, the volume density of plasmas is higher, the development and application field of secondary products is wider and the like.

The invention relates to an electromagnetic shielding package body which includes: a substrate; at least two chips which are disposed on the substrate; a shielding body which is made of a shielding gel and covers the chips and separate the chips from one another so as to provide electromagnetic shielding between the chips and the environment and among the chips, wherein the shielding body is grounded through a conductor; and an insulating layer which is made of an insulating gel, wherein the insulating layer is coated to a conductive structure of the chips, in supposedly electrical insulation from the shielding body, and / or is coated to a conductive structure of the substrate, in supposedly electrical insulation from the shielding body, such that the conductive structure and the shielding body are electrically insulated. The invention also relates to a method for manufacturing such electromagnetic shielding package body.

An air conditioner includes a direct-current (DC) power supply, a compressor, and a compressor driving device that converts a current supplied from the DC power supply into an alternate-current (AC) for driving the compressor. The DC power supply energizes the driving device through a center conductor and an outer conductor of a shield cable. This structure allows the driving device not to include a capacitor for smoothing a power current, and to suppress surge voltages and electromagnetic-wave radiation, thus providing an air-conditioner including a compact size and light-weighted compressor driving device.

The invention relates to the circuit board wiring technology field and discloses a circuit board, a distribution method of surface-layer high-speed difference lines and communication equipment. The circuit board comprises a routing layer, a grounding metal layer and a dielectric layer located between the routing layer and the grounding metal layer. At least one pair of difference lines and ground lines are formed in the routing layer. Two sides of each pair of the difference lines are provided with the ground lines. In the ground lines of the two sides of each pair of the difference lines, the ground lines and the grounding metal layer are connected through a plurality of via holes. In the via hole corresponding to one side ground line, a distance between each via hole and an edge of one side of the one side ground line is less than 2000 micrometers, wherein the edge faces towards one side of the difference line. A distance between the any two adjacent via holes is less than 2000 micrometers. By using the circuit board, an electromagnetic interference generated by the difference lines during high frequency signal transmission can be reduced.

The invention discloses a circuit board shielding method and the electronic apparatus applying the method. The method comprise: arranging two areas with good connection near the electronic circuit needing shielding on the inner circuit board, connecting shielding wire or thin sheet metal which is exactly upon the electronic circuit. Consequently, by adopting shielding wire or thin sheet metal instead of current metal shielding case, the electromagnetic radiation of the circuit board is inhibited effectively by a simple structure, thereby the invention achieves the evident advantages of good manufacturability and low cost; further more, by arranging inserting structures on both sides of the shielding wire or thin sheet metal, and connecting and fixing with circuit board by inserting, the electronic apparatus maintenance is made more convenient.

The invention discloses a power supply system of a buried sewage treatment equipment fan room. A drive module for converting alternating current provided by a power supply device into alternating current or direct current required by a load device is arranged between a power supply device and the load device, an input stage of the drive module is connected with a filtering decoupling circuit for inhibiting differential mode interference from the power supply device, the power supply device is connected with the drive module through a connecting cable, and the drive module and the load device are connected through a connecting cable, at least one core wire is arranged in an outer protection layer of each connecting cable and wraps an inner protection layer. The power supply system is provided with a first lightning protection circuit and a second lightning protection circuit, wherein the first lightning protection circuit is connected between the input end and the grounded end of the drive module, and the second lightning protection circuit is connected between the output end and the grounded end of the drive module. The power supply system of the buried sewage treatment equipment fan room can improve the performance on at least one aspect of safety, anti-interference or controllability and the like.

The invention relates to a compound microstrip line device for inhibiting the electromagnetic radiation of a double frequency mobile. The device comprises a microstrip line, a patch inductor LL, a patch capacitor CL, a metal receiving plate, a corner microstrip line, a taper microstrip line, a grounding spot, a U shape metal belt and two blocks of external metal conduction tablets. A microwave LC loop is formed by the metal receiving plate, the compound microstrip line of left / right and the grounding spot of the device, which is capable of consuming the excess electromagnetic radiation of the mobile phone, so as to reduce the damage to the brain of mobile phone users. The invention is manufactured by adopting low cost materials like the patch capacitor, the patch inductor, the metal copper sheet conductor and microstrip line. The invention has the advantages of low manufacturing cost, easy assembling and convenient for embedding into the double frequency mobile.

A printed wiring board device used for electronic equipment, such as the information equipment, etc. A printed wiring board (10) has a power source layer (11) and a ground layer (12) and is mounted with active elements (3 and 4), such as digital ICs, etc. A first capacitor (1) which conductively couples the layers (11 and 12) with each other at a high frequency is provided in the peripheral section of one end side or the other end side of the section of the board (10) where the layers (11 and 12) are faced to each other. Second capacitors (2) which respectively supply transient currents to the active elements (3 and 4) are provided between the power supply pins (3V and 4V) of the elements (3 and 4) and the ground layer (12) near the elements (3 and 4). Therefore, the electromagnetic radiation caused by the power source layer (11) and the ground layer (12) of the printed wiring board (10) can be suppressed easily and remarkably.

The invention relates to the field of electronic devices, in particular to a miniaturized power divider. The miniaturized power divider comprises two power dividing branches, micro-strip connecting units, a medium plate and a plurality of metal conductive via holes, each power dividing branch comprises a forward circuit and a reverse circuit which are connected through the corresponding micro-strip connecting unit, each forward circuit comprises forward micro-strip-coplanar waveguide transmission units which are connected end to end, and each reverse circuit comprises reverse micro-strip-coplanar waveguide transmission units which are connected end to end; each forward micro-strip-coplanar waveguide transmission unit comprises a micro-strip transmission line section and a coplanar waveguide transmission line section which are connected end to end through the corresponding metal conductive via holes, each micro-strip transmission line section is located at the top of the medium plate, and each coplanar waveguide transmission line section is located at the bottom of the medium plate; each reverse micro-strip-coplanar waveguide transmission unit comprises a micro-strip transmission line section and a coplanar waveguide transmission line section which are connected end to end through the corresponding metal conductive via holes, each micro-strip transmission line section is locatedat the top of the medium plate, and each coplanar waveguide transmission line section is located at the bottom of the medium plate. The miniaturized power divider has the advantages that the double-layer micro-strip-coplanar waveguide Z-shaped cross transmission lines are adopted, and miniaturization of the power divider is achieved.

The invention discloses an electric control assembly and electrical equipment. The electric control assembly comprises an electric control board, wherein the electric control board is provided with asystem protection ground, a power supply input terminal and a ground wire terminal used for accessing a power supply, and a power supply output terminal and a motor ground terminal used for accessinga motor, the ground wire terminal being connected with the system protection ground; a power supply filter circuit, wherein the input end of the power supply filter circuit is connected with the powersupply input terminal, and the output end of the power supply filter circuit is connected with the power supply output terminal; an EMC filter circuit, wherein the input end of the EMC filter circuitis connected with the motor grounding terminal and the grounding end of the power supply filter circuit, and the output end of the power supply filter circuit is connected with a system reference ground. According to the invention, EMC electromagnetic radiation generated by the motor is suppressed, and the overall EMC anti-interference performance of an electrical equipment product is improved.

An electromagnetic shielding structure includes a first shielding material disposed at a first location with respect to at least one radiation source and a second shielding material attached with the first shielding material by fastening means. The second shielding material is disposed at a second location with respect to the at least one electromagnetic radiation source so as to define a predetermined gap between the first shielding material and the second shielding material. The first shielding material shields at least part of first frequency electromagnetic radiations generated from the at least one electromagnetic radiation source and penetrating through the second shielding material and the predetermined gap. The second shielding material shields at least part of second frequency electromagnetic radiations generated from the at least one electromagnetic radiation source.

The invention discloses a Hall sensor device with temperature compensation. The Hall sensor device comprises a power supply circuit, a main Hall sensor circuit, an auxiliary Hall sensor circuit and an output filter circuit; the output end of the auxiliary Hall sensor circuit is used for driving a Hall sensor coil; each Hall sensor circuit comprises a Hall sensor, a voltage limiting circuit, a same-direction proportion circuit and a driving power amplification circuit which are connected in sequence; and the output ends of the two driving power amplification circuits are respectively connected with the output filter circuit. The Hall sensor device has a power supply reverse connection protection function and a function of inhibiting external power supply fluctuation, has a function of reducing power supply ripples, has a same-direction proportion circuit function, has a function of suppressing electromagnetic compatibility, has a function of inhibiting electromagnetic radiation, has a function that a coil magnetic field of the sensor and an external bus are used for forming a closed-loop system, and has a function of automatically compensating the temperature performance is realized.

The invention discloses a multifunctional nano-composite lace fabric which comprises a lace base cloth layer, a nano-antibacterial layer, a nanometer radiation-resistant layer and an outer fabric layer, wherein the nanometer radiation-resistant layer is arranged on the lace base cloth layer, the outer fabric layer is arranged on the nanometer radiation-resistant layer, the nano-antibacterial layer is arranged at the bottom of the lace base cloth layer, and a nano-resin layer is arranged on the outer fabric layer. Through the manner, the multifunctional nano-composite lace fabric provided by the invention can effectively restrain electromagnetic radiation, and a water-proof effect is good.

The invention relates to an entertainment induction cooker. The entertainment induction cooker comprises a cooker body, and an electromagnetic wire coil coupled to a control module is arranged in thecenter of the interior of the cooker body; a transparent annular sealing cavity surrounding a central heating area is formed in the upper surface of the cooker body, a transparent annular elastic bagis embedded in the annular sealing cavity, the annular elastic bag is filled with a water body, and bright wafers are suspended in the water body; and a circle of annular conducting layer is arrangedon the outer circumferential face of the annular elastic bag, and a circle of annular conducting layer is also arranged on the inner circumferential face of the annular sealing cavity. In the heatingprocess of the induction cooker, the dynamic artistic effect can be shown, high interestingness and ornamental value are achieved, and meanwhile electromagnetic radiation can be restrained to a certain extent.

To achieve a size-reduction of an optical module having a circuit that generates a high-frequency clock signal for controlling optical modulation by an optical modulator and to suppress radiation of electromagnetic waves from the optical module. A through-hole via is formed on a multilayer printed circuit board so as to be insulated from a plurality of grounded wiring layers by an anti-pad. A coaxial connector and an intensity modulation control IC that generates a high-frequency clock signal are provided on the multilayer printed circuit board. The high-frequency clock signal is input to the coaxial connector through a micro-strip line formed on the multilayer printed circuit board. An open stub connected to the through-hole via is provided on a wiring layer between a first wiring layer and a second wiring layer among the plurality of wiring layers.

The invention discloses a millimeter-wave wideband low-sidelobe horn antenna. A rectangular feeding waveguide, a rectangular circular transition segment, a round stepped transition segment, a round radiation aperture surface are sequentially arranged along a transferring direction of an electromagnetic wave to form an electromagnetic radiation region, wherein the rectangular circular transition segment is used for achieving conversion from the rectangular feeding waveguide to the round stepped transition segment, the round stepped transition segment is used for gradually expanding a round aperture surface of the last stage of the rectangular round transition segment to the tail-stage aperture surface by a plurality of steps, and a matching segment is extended from the tail-stage aperture surface at equal width to form the round radiation aperture surface. The horn antenna employs a stepped transition radiation segment to substitute a continuous transition radiation segment, a structureof a wave limitation groove is integrated at the periphery of the radiation aperture surface, the proposed antenna has the integrated structure characteristic and can be implemented purely by a conventional mechanical processing technology, other complicated processed are not needed to help, subsequent splicing assembly is not needed, the product consistency is good, and a single piece is low incost, wide in frequency band and low in radiation sidelobe.