75results about How to "Reduce electromagnetic coupling" patented technology

A neurostimulation lead is configured to be implanted into a patient's body and has at least one distal electrode. The lead comprises at least one conductive filer electrically coupled to the distal electrode, a jacket for housing the conductive filer and a shield surrounding at least a portion of the filer for reducing electromagnetic coupling to the filer.

An antenna configuration includes two closely spaced antennas each positioned so as to be orthogonally polarized with respect to the other. The antenna configuration increases antenna isolation and reduces electromagnetic coupling between donor side antenna and repeat side antenna. The antennas include printed dipoles connected to respective transceivers through respective baluns to balance the non-symmetrical portions of the antenna feed paths to reduce unwanted radiation therein. Printed features such as chokes and non-symmetrical and non-parallel structures are preferably included in the ground plane of a multi-layer circuit board to reduce or eliminate circulating ground currents.

A wireless communication node, such as a repeater, including a frequency translating repeater, a physical layer (PHY) repeater, time divisional duplex repeater (TDD) and the like, is configured with a pair of directional patch antennae and an omni-directional antenna. The patch antennae can be selected depending on the orientation of the repeater package to communicate with a station such as an access point or a base station. The omni-directional antenna can be directed toward another station such as a client. The patch antennae and the omni-directional antenna can be orthogonally polarized to increase isolation and reduce electromagnetic coupling. Multiple antennae can be used in multiple-input-multiple-output (MIMO) configurations.

A neurostimulation lead is configured to be implanted into a patient's body and has at least one distal electrode. The lead comprises at least one conductive filer electrically coupled to the distal electrode, a jacket for housing the conductive filer and a shield surrounding at least a portion of the filer for reducing electromagnetic coupling to the filer.

A controller of a MIMO antenna apparatus calculates a current transmission capacity based on signal levels detected by a signal level detector circuit. The controller calculates an estimated transmission capacity assuming that at least one of antenna elements currently connected to a MIMO modulator and demodulator circuit is changed to a further antenna element not connected to the MIMO modulator and demodulator circuit, based on the detected signal levels and degrees of electromagnetic coupling stored in a degree-of-coupling memory. The controller controls a switch circuit to connect the further antenna element to the MIMO modulator and demodulator circuit when the current transmission capacity becomes lower than the estimated transmission capacity.

The present invention provides a vertical magnetic field MRI apparatus which is capable of speeding up imaging for taking an image of any cross section of a wide area such as a total body, while suppressing increase of the number of channels and maintaining high sensitivity in a deep portion of a subject. A receiver coil unit 500 incorporates a bed coil unit 600 whose longitudinal direction agrees with a body axis direction of the test object 103, and an upper coil unit 700 which is detachably mounted on the bed coil unit 600. The bed coil unit 600 is provided with a carrying surface 601 for placing the test object 103 thereon and multiple lower sub-coils arranged in a lower part of the carrying surface 601, and the upper coil unit 700 is provided with multiple upper sub-coils which are connected to the lower sub-coils. The upper sub-coils are separated into two parts; one arranged in a flexible inner support 20-1 covering the installation surface 601 and another arranged in a flexible outer support 20-2 covering the external side of the inner support 20-1. The upper sub-coils and the lower sub-coils are connected by mounting the upper coil unit 700 on the bed coil unit 600, thereby forming the multiple types of sub-coils.

A signal transmission structure is provided. The structure mainly comprises at least a conductive via, at least a via land and a conductive wall. One end of the conductive via is connected to the via land. The conductive wall covers only a portion of the inner wall of a through hole in the core layer of a circuit substrate. The conductive wall has a semi-circular or a C-shaped structure. Therefore, when a signal passes the conductive via and the via land of the circuit substrate through the conductive wall in the interior of the via, because of a more continuous impedance between the via land and the conductive wall, signal reflection due to impedance mismatch along the signal transmission pathway can be reduced to enhance signal transmission quality.

The invention discloses a non-shielded symmetry data cable used in 10G Ethernet, comprising a plurality of coupled twisted lines, stuff, an inner protective sleeve, and an outer protective sleeve, wherein the outer surface of the inner sleeve is provided with a plurality of protrusions. The invention uses double layers of protective sleeves to resolve the inter-group interference problem between nearby cables of non-shielded wire system at high-speed transmission in 10G Ethernet, and uses special waveform inner protective sleeve or the like to increase the distance between nearby cable groups of beam bonded communication cables, as well as meet the wire flexible and easy installment demands, while The invention can save the material of protective sleeve, with high benefits and practicality. The invention uses special waveform structure of the double layers of protective sleeves to effectively restrain inter-group interference.

The invention discloses a broadband low-loss passive balun on chip having a laminated winding structure. The balun on chip is provided with three layers of metal conducting wires. The metal conducting wires in a first layer are secondary conducting wires, the metal conducting wires in a second layer are primary conducting wires and the metal conducting wires in a third layer are ground wires. U-shaped continuous bent winding structures are formed between the heads and tails of the conducting wires of each layer. The geometrical shapes of all U-shaped bends are completely consistent. The U-shaped bends are broken from midpoints between the heads and tails of the secondary conducting wires in the first layer to form left and right discontinuous U-shaped bend sections. Single-end signals of an unbalanced end are connected with the heads of the primary conducting wires. The tails of the primary conducting wires are connected to the ground wires. The heads and tails of the secondary conducting wires are all connected with the ground wires. Breakpoints of the conducting wires in the same sections with the heads of the secondary conducting wires are normal phase signal output ends, and the breakpoints of the conducting wires in the same sections with the tails of the secondary conducting wires are inverted signal output ends. The single-end signals of the unbalanced end are convertedinto differential signals of a balanced end for output under the coupling action of the primary and secondary conducting wires. The ground wires reduce the insertion loss of the balun and simultaneously expand a gain bandwidth and a matched bandwidth.

A signal transmission structure is provided. The structure mainly comprises at least a conductive via, at least a via land and a conductive wall. One end of the conductive via is connected to the via land. The conductive wall covers only a portion of the inner wall of a through hole in the core layer of a circuit substrate. The conductive wall has a semi-circular or a C-shaped structure. Therefore, when a signal passes the conductive via and the via land of the circuit substrate through the conductive wall in the interior of the via, because of a more continuous impedance between the via land and the conductive wall, signal reflection due to impedance mismatch along the signal transmission pathway can be reduced to enhance signal transmission quality.

The invention provides a radiation structure and an array antenna. The radiation structure comprises a radiation fin with a radiation slot in the middle. The radiation slot consists of a transverse slot and a longitudinal slot, which are communicated with each other and are cross-orthogonal. The length of the transverse slot and the length of the longitudinal slot are less than the length of the radiation fin in the extending direction of the corresponding radiation slot. By adding the radiation slot to the radiation fin, the radiation structure can produce two kinds of radiation synchronouslywhen working in an antenna system, so as to achieve an effect of polarization vector superposition enhancement. Thus, the same radiation efficiency and radiation gain of the multi-layer patch structure in the traditional antenna can be achieved by only one layer of radiation fin, fewer components are used, the structure is simple, the antenna profile can be reduced, and antenna miniaturization isfacilitated.

A plasma material design method includes: adopting a fluorescent tube as a plasma generator, simulating a cylindrical plasma material, acquiring electromagnetic parameters of the cylindrical plasma material, adopting the cylindrical plasma material to construct a single plasma material layer, calculating an effective dielectric constant according to transmission and reflection characteristics of the cylindrical plasma material so as to acquire complex permeability and complex dielectric permittivity of an equivalent structure of the single plasma material layer, and adopting a genetic algorithm for optimization design of single plasma material layers different in electron density to obtain a final wideband high-absorptivity plasma multilayer distribution structure. The plasma material design method has advantages that electromagnetic wave absorptivity of plasma materials is improved while reflection is reduced, electromagnetic scattering of a target and electromagnetic coupling betweena background and the target can be reduced, influences of the background on target testing are reduced, and low preparation cost and great application effects are realized.

A multi-conducting through hole structure is provided. The multi-conducting through hole structure has a substrate, at least two signal lines and at least a reference line. The substrate has a through hole passing therethrough. The signal lines are disposed on a portion of an inner surface of the through hole and extended through the through hole. The reference line is disposed on a portion of the inner surface of the through hole and extended through the through hole, wherein the reference line is disposed between the lines for signal. Because the signal lines are separated by the reference line, the electromagnetic coupling generated by signals can be reduced to lower the cross-talk interference between signals passing through the through hole, so as to promote the signal-transmission quality.

The invention provides an MIMO antenna device comprising a mainboard, a grounding board which is arranged on the main board, and a first antenna unit and a second antenna unit which are arranged on the mainboard in a mirror symmetry way. Each antenna unit comprises an antenna radiation body and a feed part. The grounding board is provided with a trough structure which is arranged between the feed parts of the two antenna units. The trough structure comprises a longitudinal trough and multiple transverse troughs which are intersected with the longitudinal trough. According to the MIMO antenna device and a mobile terminal, electromagnetic coupling between the antenna units is reduced by arrangement of multiple cross troughs on the grounding board arranged between the feed parts of the antenna units so that degree of isolation between the antenna units is improved, frequency bandwidth of the antenna units is expanded and transmission performance is also enhanced.

This antenna device is provided with two antenna elements (A1 and A2), two feed lines (L1 and L2), a feed point (P1) provided at one end of the antenna element (A1), and a feed point (P2) provided at the one end of the antenna element (A2). The feed lines (L1 and L2) extend in a first direction from the feed points (P1 and P2). The antenna element (A1) extends from the feed point (P1) in a second direction perpendicular to the first direction, and the antenna element (A2) extends from the feed point (P2) in a third direction which is oriented opposite to the second direction. The antenna device is provided with a sleeve element (S0) which has an end which is connected to a respective grounded conductor of each of the feed lines (L1 and L2) at positions near the feed points (P1 and P2), and extends in the first direction from the position near the feed points (P1 and P2).

The invention provides a Brew Rayne pulse-forming line voltage multiplier. The voltage multiplier is formed by stacking of a plurality of single-stage flat-plate Brew Rayne pulse-forming lines in a crossed mode, and each single-stage flat-plate Brew Rayne pulse-forming line comprises a ceramic solid-state flat-plate transmission line, a GaAs photoconductor switch, a laser diode triggering system and a non-inductive resistance load. The single-stage flat-plate Brew Rayne pulse-forming lines are compactly distributed on a platform to form a multi-stage stacking flat-plate Brew Rayne pulse-forming line voltage multiplier. According to the Brew Rayne pulse-forming line voltage multiplier, short pulse high voltage output several times higher than the amplitude of output voltage of each ingle-stage flat-plate Brew Rayne pulse-forming line and with a nanosecond pulse width can be obtained, and through the fact that multiple groups of multi-stage stacking flat-plate Brew Rayne pulse-forming line voltage multiplier can be formed by multiple groups of multi-stage flat-plate Brew Rayne pulse-forming line voltage multipliers or multi-stage stacking flat-plate Brew Rayne pulse-forming line with more stages are designed, short pulse high voltage with a higher voltage amplitude and higher peak power can be obtained.

A non-volatile storage having individually controllable shield plates between storage elements. The shield plates are formed by depositing a conductive material such as doped polysilicon between storage elements and their associated word lines, and providing contacts for the shield plates. The shield plates reduce electromagnetic coupling between floating gates of the storage elements, and can beused to optimize programming, read and erase operations. In one approach, the shield plates provide a field induced conductivity between storage elements in a NAND string during a sense operation so that source / drain implants are not needed in the substrate. In some control schemes, alternating high and low voltages are applied to the shield plates. In other control schemes, a common voltage is applied to the shield plates.

The invention provides a winding modular permanent-magnet motor. The winding modular permanent-magnet motor comprises a stator, a rotor and air gaps, wherein the stator comprises a stator core, armature windings, permanent magnets and magnetic conduction small teeth, large grooves are formed in the stator core, the permanent magnets and the magnetic conduction small teeth are arranged at groove openings facing the air gaps, the arc lengths of the permanent magnets and the magnetic conduction small teeth both are Pi, the magnetization direction of the permanent magnets are same, a positive winding and a negative winding of a single effective coil of each phase are arranged in two adjacent large grooves, N coils in the same phase are sequentially wound around adjacent 2N large grooves according to a single coil winding method, teeth among the grooves where the same phase winding is located are first teeth, teeth among different phase windings are second teeth, the rotor comprises rotor cores and gaps, the arc length distance between adjacent rotor cores is 2Pi, and an air gap is formed between the stator and the rotor. The motor employs a same-phase winding modular structure design, the winding structure is simplified, the length of an end part of the winding is shortened, the winding utilization ratio is improved, and the torque density is improved.

In a magnetic resonance scanner, a main magnet system (10) is wound to generate a longitudinally directed main magnetic field (B0) at least in a scanning region (20). The main magnet system includes a central magnet winding region (30) wound layer-by-layer disposed between outer magnet winding regions (32, 34). A longitudinal magnetic field gradient system (12, 12') includes a central gradient winding region (40, 40', 42, 42') wound to generate a main longitudinally directed magnetic field gradient disposed between outer gradient winding regions (44, 46) wound to generate a compensatory longitudinally directed magnetic field gradient having opposite polarity from the main longitudinally directed magnetic field gradient. The outer gradient winding regions are arranged to substantially null mutual inductance between the outer magnet winding regions (32, 34) and the longitudinal magnetic field gradient system (12, 12').

The invention discloses a high-performance voltage-controlled oscillator, and belongs to the technical field of semiconductor integrated circuits. The voltage-controlled oscillator comprises an automatic amplitude control circuit (1), a first compensation loop (2), an inductor assembly (3), a capacitor assembly (4) and a second compensation loop (5) which are connected in parallel. The automatic amplitude control circuit (1) comprises a digital automatic amplitude control circuit (11) and an analog automatic amplitude control circuit (12), and through the combination of the digital automatic amplitude control circuit and the analog automatic amplitude control circuit, the voltage-controlled oscillator can work at a critical point of a current limited region and a voltage limited region. The inductor assembly (3) adopts an 8-type inductor designed by connecting metal layers in parallel. The capacitor assembly (4) comprises a switched capacitor array unit (41) and a varactor unit (42), so that the voltage-controlled oscillator realizes a broadband function. According to the voltage-controlled oscillator, the broadband and low-phase noise are realized, and meanwhile, the low-power consumption performance can be realized.

A multi-microgrid flexible interconnection structure based on common connection units comprises a plurality of alternating current interface connection lines, a plurality of direct current interface connection lines and a plurality of common connection units; two ends of each alternating current interface connection line are respectively connected with a public supply network and one correspondingcommon connection unit; two ends of each direct current interface connection line are respectively connected with the common connection units; and each common connection unit is connected with one corresponding microgrid. The multi-microgrid flexible interconnection structure based on common connection units can improve the operation reliability of the multi-microgrid system by support of the frequency, the voltage and the power of the public supply network and can provide a higher control dimension and more flexible control strategy so as to obtain a better control effect, improve operationflexibility of the multi-microgrid system, reduce the electromagnetic coupling between the microgrids, improve the electric energy quality and improve the access capacity and the utilization rate of distributed new energy.

The invention discloses a large current measuring device with an anti-skin effect. The large current measuring device with the anti-skin effect comprises a coil mother plate, a positive electrode, a negative electrode, multi-split current conduits, and a signal acquisition and processing device; large current to be measured flowing through the positive electrode and the negative electrode is introduced into the multi-split current conduits and is split into multiple parts, each current conduit penetrates through the coil center on the coil mother plate to generate induced voltage, and a largecurrent value is obtained by measuring the superimposed induced voltage; the coil mother plate adopts an integrated forming technology, consistency of each coil is high, electromagnetic interference between adjacent coils is reduced, and accuracy of measurement results is improved; the current flowing through each current conduit is very small compared to total current, and the skin effect is effectively reduced; current directions of adjacent conduits are opposite, magnetic induction intensity around a conductor is weaken, and electric force between conductors is decreased; and multiple current conduits increase the heat dissipation area of the measuring device, and the problems that the measuring range is too narrow or the upper limit is difficult to be raised due to the heating effect of the current are solved.

A controller of a MIMO antenna apparatus calculates a current transmission capacity based on signal levels detected by a signal level detector circuit. The controller calculates an estimated transmission capacity assuming that at least one of antenna elements currently connected to a MIMO modulator and demodulator circuit is changed to a further antenna element not connected to the MIMO modulator and demodulator circuit, based on the detected signal levels and degrees of electromagnetic coupling stored in a degree-of-coupling memory. The controller controls a switch circuit to connect the further antenna element to the MIMO modulator and demodulator circuit when the current transmission capacity becomes lower than the estimated transmission capacity.

A method for fabricating non-volatile storage having individually controllable shield plates between storage elements. The shield plates are formed by depositing a conductive material such as doped polysilicon between storage elements and their associated word lines, and providing contacts for the shield plates. The shield plates reduce electromagnetic coupling between floating gates of the storage elements, and can be used to optimize programming, read and erase operations. In one approach, the shield plates provide a field induced conductivity between storage elements in a NAND string during a sense operation so that source / drain implants are not needed in the substrate. In some control schemes, alternating high and low voltages are applied to the shield plates. In other control schemes, a common voltage is applied to the shield plates.

The invention relates to an anti-crosstalk eddy current nondestructive flaw detection system based on a magnetic sensing probe. The array probe is composed of a plurality of probe units, and each probe unit is wrapped by a magnetic shielding cover and then is vertically arranged in a groove of an array framework; and analog voltage acquired by the probe array passes through a multi-path signal conditioning module, is automatically acquired by a data acquisition card and is then output to an upper computer so that a detection result is displayed. According to the invention, influence of the lift-off distance in eddy current nondestructive testing is effectively inhibited, the detection speed is high, the detection range is wide, the influence of mutual inductance between the probe units is effectively reduced, the anti-interference capability and the detection precision are improved, and finally, the detection result is displayed in real time by utilizing the upper computer, so that detected defect information can be more intuitively obtained.

The invention discloses a crosslinked polyethylene insulated low-smoke halogen-free flame-retardant computer cable, which comprises a waterproof protective sleeve, a total shielding layer, fillers, isolation layers, split-phase shielding layers, polyester film belts, insulating layers, cable cores, a clamping block and a second magnetic ring, and is characterized in that the total shielding layeris arranged in the waterproof protective sleeve, two fillers are arranged in the total shielding layer, two isolation layers are arranged in the total shielding layer, the split-phase shielding layersare arranged in the two isolation layers, the polyester film belts are arranged on the sides, which are away from the isolation layers, of the two split-phase shielding layers, and two insulating layers are arranged in each of the two polyester film belts, and cable cores are arranged in the four insulating layers. The low-halogen low-smoke flame-retardant polyvinyl chloride has the characteristics of flame retardancy, low smoke amount during combustion and small HCl gas amount. the cable cores adopt concentric layer stranding, transmission parameters are stable, electromagnetic coupling canbe reduced, and the anti-interference performance is improved.

The invention relates to a passive mixer driven power amplification device and a nonlinear compensation method, wherein the passive mixer driven power amplification device comprises a first digital-to-analog converter, a first low-pass filter, a second digital-to-analog converter, a second low-pass filter, a power amplifier, a compensation unit and a passive mixer, wherein an output end of the first digital-to-analog converter is connected with an input end of the first low-pass filter, and the output end of the first low-pass filter is connected with a first input end of the passive mixer; the output end of the second digital-to-analog converter is connected with the input end of the second low-pass filter, and the output end of the second low-pass filter is connected with a second inputend of the passive mixer; the output end of the passive mixer is connected with the input end of the power amplifier; the compensation unit is used for injecting a baseband harmonic compensation signal with preset frequency, phase and amplitude into a baseband signal; the passive mixer is used for performing frequency mixing for the baseband signal comprising the baseband harmonic compensation signal, and a local oscillation signal to obtain a radio frequency signal; and the radio frequency signal is output after being amplified through the power amplifier.

The invention discloses a wide bandgap semiconductor double-sided heat dissipation module packaging structure based on a conductive metal band, semiconductor power chips of different bridge arms are arranged on different power substrates, the size of a module is reduced, and the power density of the module is greatly improved; the power gasket is arranged between the top power substrate and the bottom power substrate, plays a role in mechanical support and electrical connection, provides an additional heat dissipation path for each semiconductor power chip on the basis of double-sided heat dissipation, reduces the thermal coupling degree between the chips, achieves the chip temperature equalization effect, and improves the heat dissipation environment of the chips; the driving loop and the commutation loop are nearly vertical in space, the electromagnetic coupling degree between the loops is greatly reduced, and the reliability of the module is further improved; the commutation loop uses the conductive metal belt to complete electrical connection required by the chip, the parasitic inductance value of the module is greatly reduced, and the source electrode conductive metal belt is provided with a hole groove at the joint, so that the distribution uniformity of the parasitic inductance can be improved, and the current sharing effect of the chip is achieved.