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59results about How to "Suppress signal interference" patented technology
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Antenna device and communication apparatus using the same
InactiveUS6281848B1High strengthInhibition decreasedSimultaneous aerial operationsAntenna supports/mountingsDielectric substrateOptoelectronics
An antenna device comprising: a feeding radiation electrode and a non-feeding radiation electrode separately disposed on a surface of a dielectric substrate; a short circuit part of the feeding radiation electrode and a short circuit part of the non-feeding radiation electrode adjacently disposed to each other on one side surface of the dielectric substrate; and an open end of the feeding radiation electrode and an open end of the non-feeding radiation electrode disposed on mutually different surface sides of the dielectric substrate other than the surface on which said short circuit parts are disposed.
Owner:MURATA MFG CO LTD
Surface-mounted antenna and communication apparatus using same
InactiveUS6297777B1Isolation effectBand of the communication wavelength can be widenedSimultaneous aerial operationsAntenna supports/mountingsLeft halfCoupling
A compact surface-mounted antenna having a wide frequency band. In the surface-mounted antenna, a first radiation electrode is formed on the left-half region of the upper surface of a base dielectric substrate. A multi-layer dielectric substrate is laminated on the upper surface of the base dielectric substrate to be bonded and fixed thereto. A second radiation electrode is formed on the right-half region of the upper surface of the multi-layer dielectric substrate. The first and second radiation electrodes are not vertically opposed to each other. Opposing edges of the first and second radiation electrodes are oblique lines. A feeding signal of a signal source is supplied to the first radiation electrode by coupling from a feeding connection electrode, and then, is supplied to the second radiation electrode from the first radiation electrode by another coupling between the first and second radiation electrodes. A direction in which the first radiation electrode excites is set to be substantially perpendicular to a direction in which the second radiation electrode excites.
Owner:MURATA MFG CO LTD
Optical fiber intelligent monitoring system and monitoring method based on phase signal carrier technology
ActiveCN103065407AHigh sensitivityExpand the detection rangeSubsonic/sonic/ultrasonic wave measurementBurglar alarm mechanical actuationVIT signalsEngineering
The invention discloses an optical fiber intelligent monitoring system and a monitoring method based on a phase signal carrier technology. The optical fiber intelligent monitoring system comprises two-core closed-loop inducting optical cables distributed in an inducting area, an optical package, a signal processing unit and a personal computer (PC) host computer. Signals inducted by the two-core closed-loop inducting optical cables are transmitted to the PC host computer sequentially through the optical package and the signal processing unit. The optical package carries out light splitting and modulation to the optical signals, the two-core closed-loop inducting optical cables generate two lines of interference lights to external inductions, and the interference lights are processed through the signal processing unit and sent to the PC host computer, and alerting signals are generated after the signals are analyzed. And therefore the purposes of high sensitivity, large detecting range and short response time are achieved.
Owner:新疆美特智能安全工程股份有限公司
Small-size high-isolation double-frequency MIMO antenna for WLAN (Wireless Local Area Network)
ActiveCN105762513ASmall sizeImprove isolationSimultaneous aerial operationsRadiating elements structural formsMimo antennaEngineering
The invention discloses a small-size high-isolation double-frequency MIMO antenna for a WLAN (Wireless Local Area Network), and belongs to the technical field of antennas. A first dielectric plate (1) is covered by two metal grounding plates (11), and the two metal grounding plates (11) are arranged vertically and are connected with each other through an inductor (12). Two surfaces of a second dielectric plate (2) and two surfaces of a third dielectric plate (3) are respectively coated with metal layers, wherein one metal layer is a dipole antenna unit which is arranged symmetrically, and the other metal layer is a rectangular metal belt (25). The antenna can completely cover the working frequency bands (2.4-2.485GHz and 5.15-5.85GHz) of the WLAN, is small in size, is high in isolation, and is good in performance of directed radiation. Moreover, the impact on the antenna from a background installation environment is smaller, and the antenna is suitable for roof-absorbing installation.
Owner:FUJIAN HUICHUANG XINGAO ELECTRONICS SCI & TECH
Radio detector for seismic exploration or vibration test
InactiveCN104749615AHigh sensitivityImprove effective signalSubsonic/sonic/ultrasonic wave measurementUsing electrical meansPhysicsMagneto
The invention discloses a radio detector for seismic exploration or vibration test. At least a pair of paired radio detector core bodies with consistent performance are installed in a rigid outer shell (2) made of magnetic materials in the form of head-to-head or bottom-to-bottom, a tail cone (5) or a tail base (12) is rigidly connected with the rigid outer shell (2); when a pair of radio detector cores are formed, two pairs of output signals are linked in parallel or in series reversely to form a pair of output signals as the output signal; when there are more than two pairs of radio detector cores, same-phase output signals of the radio detector cores at one side are linked in series or in parallel to form a pair of output signals; two pairs of output signals at both sides are linked in series or in parallel reversely to form a pair of output signals as the output signal. By using magneto-electrical type radio detector cores with matured technology and low cost, the radio detector basically removes the interference or false frequency of cross vibration on the radio detector; the radio detector is applicable to the analyzing field of the seismic exploration including slot wave exploration and various vibration tests.
Owner:CENT SOUTH UNIV
Special radiation signal simulation device and implementation method
ActiveCN106772294AEasy to detectSuppress signal interferenceWave based measurement systemsManagement unitIntermediate frequency
The invention discloses a special radiation signal simulation device and an implementation method. The simulation device comprises a restraint condition construction unit, an array weighting coefficient calculating unit, an emission array amplitude control unit, an emission antenna array unit, a battle situation parameter management unit, a radar signal source unit, an up-conversion unit, a receiving array amplitude control unit, a receiving antenna array unit, a down-conversion unit and an intermediate frequency signal processing unit, wherein the restraint condition construction unit, the array weighting coefficient calculating unit, the emission array amplitude control unit and the emission antenna array unit are connected in sequence; the battle situation parameter management unit, the radar signal source unit and the up-conversion unit are connected in sequence; the receiving array amplitude control unit, the receiving antenna array unit, the down-conversion unit and the intermediate frequency signal processing unit are connected in sequence; the array weighting coefficient calculating unit is connected with the receiving array amplitude control unit; the up-conversion unit is connected with the emission antenna array unit; the emission antenna array unit is an emission antenna array consisting of a plurality of emission antenna array elements; the receiving antenna array unit is a receiving antenna array consisting of a plurality of receiving antenna array elements. By adopting the special radiation signal simulation device and the implementation method, nulls can be formed at a plurality of specified angles, a quick calculating process is achieved, and radiation signals with a capability of suppressing echoes in specific directions can be simulated.
Owner:航天科工微系统技术有限公司
Miniaturized ultra-wideband antenna with dual-attenuation band function
InactiveCN101246992ASuppress signal interferenceResonant frequency controllableRadiating elements structural formsAntenna feed intermediatesOptoelectronicsOperating frequency
Ultra-wideband antenna with dual stopband capability can resolve efficiently problem that ultra-wideband communication system is disturbed by signal of narrowband communication system, one side adhesion of medium substrate is as metal layer of radiation cell and microstrip feeder, the other side adhesion is as metal layer of floor, radiation cell is a semicircle metal slice, microstrip and radiation cell are connected. Floor has symmetrical shape with radiation cell and lies on the back of microstrip feeder. Arc gap is set on radiation cell and U-shaped gap is etched on floor. The present invention can realize dual stopband capability at a certain working range (3.1GHz-10.6GHz) to filter disturb to ultra-wideband system by other latent narrowband system.
Owner:SOUTHEAST UNIV
Mechanical arm posture robustness control method based on interference estimator
ActiveCN107505841AMeet the transientSatisfy Steady State PerformanceAdaptive controlInterference resistanceDynamic models
The invention discloses a mechanical arm posture robustness control method based on an interference estimator. The mechanical arm robustness control method comprises steps of establishing a mechanical arm dynamic model and performing feedback linearity on the mechanic arm dynamic model to simplify the dynamic model into a disturbed double integration model, setting a double-component posture robustness controller in order to realize mechanical arm posture robustness tracking control, and converting a compensated control signal to a voltage signal to input into an actuator so as to complete posture robustness control of the mechanical arm under a disturbed condition. The double-component posture controller comprises two parts. One part is used for configuring an input of a nominal system in order to guarantee that a closed loop system can track reference signals and the other part is used for configuring an interference estimator for performing real-time estimation on model uncertainty and external disturbance and then performing compensation on a control signal. The mechanical arm robustness control method based on the interference estimator can effectively remove or inhibit uncertainty or an interference signal in a kinematic model in order to realize high accuracy tracking on a mechanical arm posture expectation reference signal, and is strong in interference resistance, clear in controlling parameters, less in calculation and strong in implementation.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Millimeter wave antenna array with characteristic of diversified oblique transmission angles
ActiveCN110085979ARealization of Diversified Oblique Angle CharacteristicsVariety of oblique angle characteristics guaranteedAntenna arraysRadiating elements structural formsPhase differenceWaveguide
The embodiment of the invention provides a millimeter wave antenna array with a characteristic of diversified oblique transmission angles. The antenna comprises substrate integrated waveguide ports, feed network units and antenna units, wherein the substrate integrated waveguide ports are used for receiving signals and feeding the received signals into a feed network layer; the feed network unitsare used for being mutually stacked through the dual-polarized two-layer feed network layer, carrying out coupled feeding upward through planar slots, determining the phase difference of the signals,acquiring signals to be transmitted and transmitting the signals to be transmitted to the antenna units, and signals with different phase differences are different in transmission angle; and the antenna units are used for receiving the to-be-transmitted signals transmitted by the feed network units and transmitting the to-be-transmitted signals outward in the form of millimeter waves. The millimeter wave antenna array with the characteristic of diversified oblique transmission angles has the characteristics of broadband, high gain and diversified oblique transmission angles, realizes the oblique transmission characteristic of the millimeter wave antenna array, and ensures the characteristics of broadband and high gain of the antenna.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Side-lobe suppression based beam optimization method for electrical tilt parasitic antennas
ActiveCN104102775AImprove robustnessImprove adaptabilitySpecial data processing applicationsElectricityMultipath interference
The invention provides a side-lobe suppression based beam optimization method for electrical tilt parasitic antennas. The method includes the steps of firstly, establishing an antenna array three-dimensional model according to a designed sign, calculating resonant frequencies of antennas and admittance features of antenna ports, introducing calculation results as known parameters of a side-lobe suppression algorithm into a side-lobe suppression algorithm program, and using an optimized result output after the side-lobe suppression algorithm program converges, as an impedance load value; performing further verification on the obtained load value, putting the optimized load value into ports of parasitic units, and calculating a directional diagram of the antennas. The side-lobe suppression based beam optimization method for the electrical tilt parasitic antennas has the advantages that side-lobe suppression is introduced in the optimization process as a second target function, suppression ratios of the main lobe relative to any side lobes are larger than a certain level, and multipath interference suppression can be improved on the premise of ensuring gain, main lobe formation and few nulls.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Dual-frequency broadband differential antenna
ActiveCN103560316AHigh bandwidthRealize dual frequency transmissionRadiating elements structural formsAntenna earthingsDual frequencyElectrical conductor
The invention discloses a dual-frequency broadband differential antenna which comprises a radiation sheet (1), U-type grooves (2), a medium plate (3), a feed portion (4), an inner conductor, an earth plate (5) and an antenna interface (6). The radiation sheet (1) is used for emitting electromagnetic wave energy; the U-type grooves (2) are roughly and symmetrically arranged on the two side edges of the radiation sheet (1) in parallel; the medium plate (3) is used for carrying the radiation sheet (1); the feed portion (4) is used for supplying signal feed to the radiation sheet (1); the inner conductor of the antenna interface (6) is connected to the earth plate (5); the earth plate (5) is used for carrying an antenna body and supplying grounding signals; the antenna interface (6) is used for inputting differential signals. The dual-frequency broadband differential antenna is simple in structure, symmetrical in directional diagram, wide in working band, low in cross polarization and large in gain, thereby having good popularization prospects.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Electromagnetic wave-potential communication system
InactiveUS20090034657A1Improve matchSuppress signal interferenceModulated-carrier systemsAntenna supports/mountingsCommunications systemOptoelectronics
A wave-potential detector and a wave-potential radiator are provided that detect and radiate wave-potential signals having longitudinally polarized A vectors, respectively. Wave-potential receivers and transmitters incorporating the wave-potential detector and wave-potential radiator, respectively, are also provided. The wave-potential detector includes a biased plasma device, having at least a portion of its bias current that is parallel to the direction of propagation of a wave-potential signal having a longitudinally polarized A vector. Both omnidirectional and directive wave-potential radiators are provided.
Owner:MCMASTER UNIV
Communication apparatus
ActiveUS20210099893A1Shorten the propagation distanceSuppress powerSynchronisation arrangementSpatial transmit diversityCommunication deviceReal-time computing
The present disclosure has an object to provide a specific communication technology for realizing effective communication with a flying object in a communication apparatus including the flying object. The communication apparatus includes a first base station, a flying object including a second base station, and a mobile terminal to communicate with the second base station. The first base station notifies flying object specification information that is information indicating that the second base station is included in the flying object. When the flying object specification information is received, the mobile terminal sets a direction of a beam for detecting the second base station to a second direction that is a direction vertically upward compared to a first direction that is the direction of the beam in a case where the flying object specification information is not received.
Owner:MITSUBISHI ELECTRIC CORP
White light interference measurement device and method based on sample space structure illumination
ActiveCN111220068ASuppress signal interferenceNon-destructive testingImage analysisUsing optical meansSample imageLighting system
The invention discloses a white light interference measurement device and method based on sample space structure illumination. A micro-display is added to an illumination system, and different space patterns can be projected to the surface of a sample; during measurement, a measurement area of the sample is divided according to an acquired sample image in combination with characteristics of the sample to form different illumination patterns; the illumination patterns are input into the micro-display, and asynchronous spatial illumination and white light interference measurement are carried outon adjacent areas, so as to avoid coherent interference signal interference caused by multiple reflections between adjacent points; and then, the plurality of groups of measured surface height distributions are combined to obtain the height distribution of the whole surface. Interference between adjacent points during white light interference measurement of samples such as a micro-groove array issuppressed by adopting a spatial pattern illumination method, and the samples can be quickly detected in a nondestructive manner.
Owner:INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle
InactiveCN110696622AImprove anti-interference abilityEfficient detectionElectric devicesElectric/fluid circuitClosed loopEngineering
The invention discloses an anti-interference PWM high-voltage interlocking signal detection and compensation control method for an electric vehicle, and the method comprises the steps: enabling all high-voltage parts to be sequentially connected in series through a low-voltage wire harness to form a closed loop, enabling the high-voltage part of any node to monitor a high-voltage interlocking signal transmitted by a previous node, and outputting the high-voltage interlocking signal with the same frequency to a next node; and when the HVIL signal frequency detected by the high-voltage componentof a certain node is abnormal, immediately reporting the abnormal HVIL signal frequency to the VCU to immediately turns off the high-voltage output of the whole vehicle. According to the invention, the high-voltage interlocking signal is a PWM signal with a fixed frequency duty ratio, the anti-interference capability is strong, and the high-voltage interlocking signal can be effectively detected;according to the invention, the HVIL signal is compensated, signal interference is effectively suppressed, and detection of a lower-level interlocking unit is facilitated; each high-voltage part is directly communicated with the vehicle control unit, and when a fault occurs, related safety actions are executed at the first time, which is safer and more efficient; the position of each high-voltagecomponent in the series closed loop is unique, and the high-voltage fault occurrence position can be accurately positioned.
Owner:HEFEI JUYI POWER SYST CO LTD
System and method for wideband interference suppression
ActiveUS8526550B1Suppress signal interferenceSimple systemError preventionLine-faulsts/interference reductionTime delaysSignal conditioning
A wideband interference suppression system comprises at least one signal conditioning device receiving at least one input signal having a signal of interest portion and an interference signal portion, wherein the at least one signal conditioning device is adapted to provide selective, independent, and variable control of one of a phase, a time delay, an amplitude, a radio frequency signal division, and a radio frequency signal summation of the at least one input signal to produce a modified signal. A tunable cross correlator receives a signal representative of the modified signal and is adapted to estimate one of an amplitude, a time delay and a phase delay parameter of the interference signal portion and to generate a control logic signal therefrom, wherein the control logic signal is received by the at least one signal conditioning device for independently and selectively activating and adjusting the various components thereof to suppress the interference signal portion.
Owner:LOCKHEED MARTIN CORP
Power supply device and its designing method
InactiveCN1612451ANoise suppressionSuppress signal interferencePower conversion systemsTransformerEngineering
Power supplier is in use for restraining signal interference generated in electronic equipment caused by fluctuant earth current. The power supplier includes a transformer, a first side circuit, second side circuit, and grounded conductor. Through cascaded a capacitor and an inductor, the method connects the first side circuit and the second side circuit to grounded conductor. Added capacitor can filter out noise and interference in DC and low frequencies components as well as help to maintain representation of lowered electromagnetic interference. Added inductor is in use for getting rid of noise in high frequency and interference. Most part of noise and interference signal is not possible to pass through conduction route formed. The result of the grounded method is that interfere degree is reduced greatly.
Owner:ARIMA COMP
Electromagnetic heat meter
InactiveCN102798488AReduce heating retrofit costsPromote the implementation of deepening thermal energy transformationCalorimeterThermal energyDigital signal processing
The invention discloses an electromagnetic heat meter. The electromagnetic heat meter comprises an electromagnetic flow sensor, a temperature sensor and a converter, wherein the converter comprises an amplification filter circuit and a central processor; the amplification filter circuit is internally provided with a feedback circuit; the feedback circuit comprises an analogue-digital conversion module, a digital signal processing module, a digital-analogue conversion module, a signal conversion unit and a negative feedback module; the digital signal processing module arranged in the feedback circuit analyzes flow signals and respectively feeds back a flow signal and interference noise into the amplification filter circuit to suppress interference signal and low-frequency flow noise. The electromagnetic heat meter, disclosed by the invention, has the advantages of guaranteeing the measuring precision while guaranteeing stability of the zero point of the flow and the micro-flow and satisfying high-precision requirements on detection of a small flow.
Owner:SHANGHAI YANRONG INSTR EQUIP
Wireless battery control system, method and battery pack for assigning id to a plurality of slave management modules
ActiveUS20200200828A1Improve space utilizationSuppress signal interferenceBatteries circuit arrangementsCharging stationsTelecommunicationsControl system
Provided is a wireless battery control system, a method and a battery pack. The system includes a master, and a plurality of slaves sequentially positioned at different distances from the master. The master wirelessly transmit a preparation signal when entering an ID assignment mode. Each slave wirelessly transmits Received Signal Strength Indicator (RSSI) of the preparation signal to the master when wirelessly receiving the preparation signal from the master or other slave during operation in a standby mode. The master wirelessly transmits an ID associated with the operation count to a slave having wirelessly transmitted a maximum RSSI among the RSSIs of the preparation signal, and increases the operation count by 1.
Owner:LG ENERGY SOLUTION LTD
Process for making magnetic recording medium and magnetic recording-reproducing apparatus
ActiveUS8336193B2Excellent partitionabilityImprove recording densityDecorative surface effectsNanoinformaticsReactive plasmaRecording density
Owner:RESONAC CORPORATION
Method for producing magnetic recording medium, and magnetic recording/reproducing apparatus
ActiveUS8551349B2Good head-floatabilityExcellent partitionabilityDriving/moving recording headsDecorative surface effectsNon magneticMagnetic characteristic
Owner:RESONAC CORPORATION
Display panel and display device
ActiveCN112542447AReduce magnetic shared spaceSuppress signal interferenceSemiconductor/solid-state device detailsSolid-state devicesAnode voltageDisplay device
The invention relates to a display panel and a display device. The display panel comprises a substrate, a gate layer, a first electrode layer and a first shielding layer. The gate layer is arranged onone side of the substrate. The first electrode layer is arranged on the side, which is away from the substrate, of the gate layer. The first shielding layer is arranged between the gate layer and thefirst electrode layer. The first shielding layer divides the space into a first space between the first shielding layer and the substrate and a second space between the first shielding layer and thefirst electrode layer. The first shielding layer reduces the magnetic field sharing space among the three layers, further suppresses the signal interference of the change of the magnetic field of thegate layer or the first electrode layer on other metal layers, improves the stability of the cathode and anode voltage difference, and further improves the consistency of the brightness of the same kind of pixels, thereby improving the display uniformity and the picture quality of the display panel.
Owner:HEFEI VISIONOX TECH CO LTD
Circuit for inhibiting interference signal and carrying out surge protection
ActiveCN102386619AThe overall impact is smallSuppress signal interferenceData switching networksEmergency protective arrangements for limiting excess voltage/currentTelecommunicationsInterference (communication)
Owner:黄兴英
Wireless battery control system and method and battery pack for allocating id to multiple slave management modules
ActiveCN110945742ANo risk of disconnectionImprove utilizationBatteries circuit arrangementsCharging stationsTelecommunicationsReceived signal strength indication
Wireless battery control system and method and a battery pack are provided. The system comprises: a master; and a plurality of slaves positioned sequentially such that the distances from the master are different from one another. The master wirelessly transmits a ready signal when entering into an ID allocation mode. Each of the slaves wirelessly transmits the RSSI of the ready signal to the master when the ready signal is wirelessly received from the master or another slave during operation in standby mode. The master wirelessly transmits an ID associated with an operation count to a slave which has wirelessly transmitted the maximum RSSI among the RSSIs of the ready signal, and increases the operation count by 1.
Owner:LG ENERGY SOLUTION LTD
A miniaturized high-isolation dual-band mimo antenna for wireless local area networks
ActiveCN105762513BReduce volumeGood for expanding bandwidthSimultaneous aerial operationsRadiating elements structural formsMimo antennaEngineering
Owner:FUJIAN HUICHUANG XINGAO ELECTRONICS SCI & TECH
Flexible anti-aging shielding twisted pair cable and preparation method thereof
PendingCN110853827ASuppress interferenceContainment leakNon-insulated conductorsFlexible cablesElectrical conductorHigh density
The invention discloses a flexible anti-aging shielding twisted pair cable and a preparation method thereof. The cable is characterized in that four twisted-pair wire cores and a cross-shaped fillingcore material are twisted together to form a cable core, the exterior of the cable core is coated with a fluororesin wrapping tape layer, an aluminum-plastic composite tape wrapping layer, a copper wire shielding winding layer and a silane grafted crosslinked high-density polyethylene insulating layer, the pair-twisted wire core is formed by pair twisting of two insulating wire cores, each insulating wire core comprises an inner conductor and a silane grafted crosslinked low-density polyethylene insulating layer, a nickel copper damage prevention coating and a zinc oxide barrier layer are sequentially sprayed outside the inner conductor and the copper wire shielding winding layer, the cross-shaped filling core material comprises a cross-shaped resin matrix and an aluminum foil layer, an aluminum-plastic composite belt wrapping layer is of an aluminum-plastic composite belt gap wrapping structure, and the aluminum-plastic composite belt comprises an aluminum foil belt outer layer and aPET resin belt inner layer. The cable is advantaged in that the cable effectively suppresses signal interference caused by crosstalk between the pair-twisted wire cores, can effectively suppress a copper damage phenomenon of an insulating layer, and has better mechanical strength, flexibility and electrical characteristics.
Owner:浙江元通线缆制造有限公司
Method for fabricating magnetic recording medium, and magnetic recording/reproducing apparatus
InactiveCN101960517ASuppress signal interferenceImprove productivityConductive/insulating/magnetic material on magnetic film applicationRecord information storageRecording densityNon magnetic
Owner:RESONAC HOLDINGS CORPORATION
A radiation signal simulation device and its implementation method
ActiveCN106772294BEasy to detectSuppress signal interferenceWave based measurement systemsManagement unitIntermediate frequency
The invention discloses a special radiation signal simulation device and an implementation method. The simulation device comprises a restraint condition construction unit, an array weighting coefficient calculating unit, an emission array amplitude control unit, an emission antenna array unit, a battle situation parameter management unit, a radar signal source unit, an up-conversion unit, a receiving array amplitude control unit, a receiving antenna array unit, a down-conversion unit and an intermediate frequency signal processing unit, wherein the restraint condition construction unit, the array weighting coefficient calculating unit, the emission array amplitude control unit and the emission antenna array unit are connected in sequence; the battle situation parameter management unit, the radar signal source unit and the up-conversion unit are connected in sequence; the receiving array amplitude control unit, the receiving antenna array unit, the down-conversion unit and the intermediate frequency signal processing unit are connected in sequence; the array weighting coefficient calculating unit is connected with the receiving array amplitude control unit; the up-conversion unit is connected with the emission antenna array unit; the emission antenna array unit is an emission antenna array consisting of a plurality of emission antenna array elements; the receiving antenna array unit is a receiving antenna array consisting of a plurality of receiving antenna array elements. By adopting the special radiation signal simulation device and the implementation method, nulls can be formed at a plurality of specified angles, a quick calculating process is achieved, and radiation signals with a capability of suppressing echoes in specific directions can be simulated.
Owner:航天科工微系统技术有限公司
Miniaturized broadband five-frequency-band band-pass filter
ActiveCN113097671AFive-bandSuppress signal interferenceWaveguide type devicesFrequency bandDielectric substrate
The invention discloses a miniaturized broadband five-frequency-band band-pass filter. The filter comprises an upper-layer micro-strip structure, a middle-layer dielectric substrate and a lower-layer grounding metal plate, the upper-layer micro-strip structure is attached to the upper surface of the middle-layer dielectric substrate, and the lower-layer grounding metal plate is attached to the lower surface of the middle-layer dielectric substrate. The upper-layer microstrip structure is a five-frequency-band band-pass filter, the five-frequency-band band-pass filter comprises an input feeder line and an output feeder line which are arranged at the two ends, a square structure is arranged between the input feeder line and the output feeder line, a regular octagonal structure is arranged in the square structure, a+9nd two groups of gradually-changed stepped impedance resonators are symmetrically arranged in the regular octagonal structure by taking the diagonal line of the square structure as the center line. In order to improve the broadband, a pair of open-circuit branches are loaded at each of the eight vertexes of the regular octagonal structure, an open-circuit branch is loaded at the midpoint of each side of the square structure, and the open-circuit branches are connected with the input feeder line and the output feeder line at the two ends respectively, so that the broadband five-frequency band is realized.
Owner:XIDIAN UNIV
Motor train unit safety interlock control device
InactiveCN113364476AImprove signal-to-noise ratioImprove accuracyTransmissionCapacitanceAdaptive filter
The invention discloses a motor train unit safety interlock control device, which comprises a preliminary filter circuit, an amplitude detection circuit, an amplitude compensation circuit, a frequency comparison circuit and a self-adaptive filter circuit, and is characterized in that a capacitor C1 and a resistor R1 are utilized to form a low-pass network to enable high-frequency interference signals to fall to the ground, and a capacitor C2 and a resistor R2 are utilized to form a high-pass network to enable low-frequency interference signals to fall to the ground. An operational amplifier AR8 is used for carrying out voltage amplification on a ground transponder signal, a triode Q5 is used for carrying out current amplification on the ground transponder signal, and a parallel resonance network 1, a parallel resonance network 2 and a parallel resonance network 3 are selected for carrying out accurate frequency-selecting filtering on the ground transponder signal. The adverse effect of the Doppler effect on receiving the ground transponder signal by the vehicle-mounted transponder receiver can be reduced, so that the signal-to-noise ratio of the received ground transponder signal is improved while the vehicle-mounted transponder receiver completely receives the ground transponder signal.
Owner:ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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