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

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 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 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 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 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).

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.

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 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.