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182 results about "Radiofrequency microwave" patented technology
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Power density is the amount of energy carried by radio frequency, i.e., microwave or radio wave, radiation as it proceeds each second through a square measure of space. The energy carried by microwave and radio wave radiation is expressed in terms of milliwatts per square centimeter (mW/cm (2) = 1/1,000 of a watt)...
Process for microwave gas purification
InactiveUS6419799B1Promote oxidationGas treatmentPhysical/chemical process catalystsMicrowaveCatalytic oxidation
Owner:CHA CHANG YUL
Ultra high-speed Si/SiGe modulation-doped field effect transistors on ultra thin SOI/SGOI substrate
InactiveUS20050127392A1Improve RF performanceImprove noise figureTransistorSemiconductor/solid-state device manufacturingLow noiseEngineering
A silicon and silicon germanium based semiconductor MODFET device design and method of manufacture. The MODFET design includes a high-mobility layer structure capable of ultra high-speed, low-noise for a variety of communication applications including RF, microwave, sub-millimeter-wave and millimeter-wave. The epitaxial field effect transistor layer structure includes critical (vertical and lateral) device scaling and layer structure design for a high mobility strained n-channel and p-channel transistor incorporating silicon and silicon germanium layers to form the optimum modulation-doped heterostructure on an ultra thin SOI or SGOI substrate capable of achieving greatly improved RF performance.
Owner:GLOBALFOUNDRIES INC
System and Method for IM3 Reduction and Cancellation in Amplifiers
InactiveUS20070222512A1Maximize cancellationMinimize electrical parasiticsAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierEngineering
Sets of power amplifier branches (which comprise an RF / microwave amplifier stage) are power combined within each stage and each set of power amplifier branches are biased in different classes of operation by bias circuits possessing different impedance characteristics such that the fundamental frequency components present at the output are in-phase with one another and the IMD3 components are anti-phase over a broad range of power levels. The RF input signal is provided by the output of the previous stage of the RF / microwave amplifier. The output of each stage is formed by power combining sets of these power amplifier branches, each of which are separately biased, so the fundamental components are additive resulting in the maximum possible output power and the IM3 components cancel partially or completely. IM3 reduction or cancellation can be achieved over a large range of output powers with the use of a feed forward control loop monitoring the input power and appropriately adjusting the bias currents and impedance characteristics of the bias circuits feeding the individual power amplifier branches in each stage of the RF / microwave amplifier.
Owner:MICROSEMI
Method for automatically calibrating the field intensity distribution characteristics of electromagnetic reverberation chamber
ActiveCN104793163AImprove anti-interference abilityWide frequency rangeElectromagentic field characteristicsElectromagnetic reverberation chamberElectromagnetic field
The invention discloses a method for calibrating the field intensity distribution characteristics of an electromagnetic reverberation chamber. The field intensity of an electromagnetic reverberation chamber can be tested by eight field intensity probes at the same time to acquire the field intensity distribution characteristics. The precision is high, and the speed is high. Spatial field intensity sensors are used to sense spatial 100MHz-18GHz radio-frequency microwave electromagnetic field signals and convert the radio-frequency microwave signals into direct-current signals. The eight channels of signals are transmitted by optical fibers to a data receiving unit after data processing end encoding is carried out and the direct-current signals pass through an electro-optical converter. The field intensity distribution characteristics of the electromagnetic reverberation chamber are calculated and processed through a central processing unit. The method is disclosed to realize accurate measurement of the distribution characteristics of a spatial broadband electromagnetic field. The range of field intensity amplitude measurement is from 1V / m to 200V / m, and the inaccuracy of measurement is 1.5dB.
Owner:CHINA SHIP DEV & DESIGN CENT
Imaging Systems and Related Methods Including Radar Imaging with Moving Arrays or Moving Targets
Imaging systems, including radio frequency, microwave and millimeter-wave arrangements, and related methods are described. According to one aspect, an imaging system includes an antenna array, a position capture system configured to generate position information indicative of locations of one of the antenna array and the target at the first and second moments in time, and wherein the one of the antenna array and the target move between the first and second moments in time, a transceiver configured to control the antenna array to emit electromagnetic energy towards the target and to generate an output that is indicative of the received electromagnetic energy, a data acquisition system configured to generate radar data, processing circuitry configured to process the position information and the radar data to generate image data regarding the target, and an interface configured to use the image data to generate visual images regarding the target.
Owner:BATTELLE MEMORIAL INST
Up and down conversion systems for production of emitted light from various energy sources including radio frequency, microwave energy and magnetic induction sources for upconversion
ActiveUS20150283392A1ElectrotherapyWater/sewage treatment by irradiationFrequency changerLength wave
Methods and systems for producing a change in a medium. A first method and system (1) place in a vicinity of the medium at least one upconverter including a gas for plasma ignition, with the upconverter being configured, upon exposure to initiation energy, to generate light for emission into the medium, and (2) apply the initiation energy from an energy source including the first wavelength λ1 to the medium, wherein the emitted light directly or indirectly produces the change in the medium. A second method and system (1) place in a vicinity of the medium an agent receptive to microwave radiation or radiofrequency radiation, and (2) apply as an initiation energy the microwave radiation or radiofrequency radiation by which the agent directly or indirectly generates emitted light in the infrared, visible, or ultraviolet range to produce at least one of physical and biological changes in the medium.
Owner:IMMUNOLIGTHT LLC +1
System and method for increasing radio frequency (RF)/microwave inductor-capacitor (LC) oscillator frequency tuning range
ActiveUS20050184820A1Reduced footprintIncrease frequencyPulse automatic controlOscillations generatorsInductorRadio frequency
System and method for increasing the frequency tuning range of a RF / microwave LC oscillator. A preferred embodiment comprises a voltage controlled oscillator (VCO) configured to generate an output signal at a frequency that is dependent upon a magnitude of an input voltage level and an effective inductance of an inductive load and a variable inductor coupled to the VCO. The variable inductor comprises a primary inductor coupled to the VCO to produce a magnetic field based upon a current flowing through the primary inductor and a secondary inductor magnetically coupled to the primary inductor, the secondary inductor to affect the magnitude of the effective inductance of the primary inductor.
Owner:TEXAS INSTR INC
Radio frequency power amplifier for Internet of Vehicles communication
PendingCN110798158AGuaranteed phase differenceIncrease output impedanceGain controlAmplifier modifications to raise efficiencyField effectField-effect transistor
The invention discloses a radio frequency power amplifier for Internet of Vehicles communication. The radio frequency power amplifier comprises an input four-path differential phase shift distributionand bias network, a first differential double-stack amplifier, a second differential double-stack amplifier, a third differential double-stack amplifier, a fourth differential double-stack amplifier,an inter-stage four-path differential matching and bias network and an output four-path differential phase shift synthesis and bias network. The core architecture of the invention adopts the characteristics of high power and high gain of a double-stack amplification network formed by field effect transistors in a radio frequency microwave band; and meanwhile, the good parasitic parameter inhibition of the differential amplifier in a microwave frequency band is combined with the good power back-off efficiency characteristic of the two-stage Doherty driving amplification structure, so that thewhole power amplifier obtains good high gain, high back-off efficiency and high power output capability.
Owner:重庆桴之科科技发展有限公司 +1
Modeling and packaging method for process tolerance and electric performance coupling characteristics in radio frequency integration
ActiveCN108345749AIncrease opennessCompatibleComputer aided designSpecial data processing applicationsElectricityCombined test
The invention provides a modeling and packaging method for process tolerance and electric performance coupling characteristics in radio frequency integration. The method starts from development and application of process IP models to put forward an integrated scheme which is compatible with existing modeling algorithms and rapidly and correctly realizes model development, integrated packaging andupdating maintenance by utilizing data of electromagnetic simulation combined test, and the integrated scheme is particularly suitable for modeling and simulation of process tolerance and electric performance coupling characteristics in radio frequency microwave integration. According to the method, processing and modeling are carried out on process tolerance data in integrated manufacturing, andmanufacture process levels are truly fed back to designers for calling through a standard IP library form, so that system-level simulation can cover analysis of process tolerance, the simulation is capable of rapidly and effectively verifying influences, on system performance, of the process manufacturing levels, and benefit is brought to shorten the design verification period.
Owner:SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
Single-layer capacitor and preparation method thereof
InactiveCN102013320AImprove pass rateIncrease effective gainFixed capacitor electrodesFixed capacitor dielectricEquivalent series inductanceLaser cutting
The invention discloses a single-layer capacitor and a preparation method thereof. The preparation method comprises the preparation of ceramic slurry, the preparation of a ceramic green sheet, sintering, cleaning, the attachment of electrode layers to the upper and lower surfaces of a ceramic medium body, and cutting. In the sintering, the ceramic green sheet is arranged on a lower zirconia plate, and an upper zirconia plate is supported and covered above the lower zirconia plate by a gasket; the electrode layers are formed by vacuum sputtering; and laser cutting is adopted in the cutting. The single-layer capacitor prepared by the preparation method can meet design requirements, and has greatly improved yield of finished product, the length and width of 0.25 to 2.54 mm, the thickness of only 0.1 to 0.5 mm, ultra-small size, ultra-low equivalent series resistance, ultra-low equivalent series inductance, high Q value under radio frequency microwaves, and the application frequency of several GHz to dozens of GHz; therefore, the single-layer capacitor and the preparation method thereof are applied to hybrid microwave integrated circuits, monolithic microwave integrated circuits and the like.
Owner:GUANGDONG FENGHUA ADVANCED TECH HLDG
Direct-adjustment analog electro-optical conversion integrated component
The invention relates to the field of microwave photons and radio over fiber, and provides a direct-adjustment analog electro-optical conversion integrated component. The component comprises a microwave chip, a high-speed laser chip, a microwave matching network, a temperature regulation and control unit, a coupling lens, a control circuit unit, a radio frequency input port and an optical output port, hybrid integrated assembly in a shielding shell is achieved through adoption of a micro-assembly process, electric signals and optical signals are respectively interconnected among all the components through lead bonding, lens coupling and the like, and radio frequency microwave signals received from a microwave matching network are loaded to the optical signals to achieve electro-optical conversion, so that the radio frequency signals are modulated on the optical signals to be output through an optical output port. According to the invention, the integrated integration of the electro-optical conversion component is achieved by using the micro-assembly process, the cost, the volume and the weight are greatly reduced, and the integration degree, the expandability and the reliability are improved.
Owner:SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
Single-chip-integrated low-power-consumption microwave radar sensing chip and radar module
PendingCN109901121AGood consistencyHighly integratedRadio wave reradiation/reflectionPhysicsTime-sharing
The invention discloses a single-chip-integrated low-power-consumption microwave radar sensing chip and a radar module, thereby solving problems that the radio-frequency front end, the signal processing circuit, the analog circuit and the MCU digital control circuit can not be integrated to a chip circuit of a same substrate material by the microwave circuit and the power consumption of the radio-frequency microwave chip is high and thus the low-cost and low-power consumption requirements of the IoT application can not be met. The microwave radar sensing chip comprises a radio frequency circuit module, an analog circuit module and a digital circuit module. On the basis of an RF-CMOS complementary metal oxide process, the radio frequency circuit module, the analog circuit module and the digital circuit module are integrated to one chip to form an on-chip system. The microwave radar sensing chip inputs a signal XTAL_P / XTAL_N by an externally connected passive crystal oscillator to provide a basic clock for the system; a TX transmitting antenna transmits a radar signal externally; and an RX receiving antenna receives a signal reflected back by the target. With voltage domain segmentation and time-sharing modes, the voltage domain of the microwave radar sensing chip is segmented and power is provided respectively.
Owner:成都指灵瞳科技有限公司
Integrated transformer balun with enhanced common-mode rejection for radio frequency, microwave, and millimeter-wave integrated circuits
InactiveCN103985503AImproved self-resonant frequencyMaximize Common Mode Rejection RatioTransformers/inductances coils/windings/connectionsFixed transformers or mutual inductancesTransformerCommon-mode rejection ratio
Apparatus and method example embodiments provide an improved common mode rejection ratio in high frequency transformer baluns. According to an example embodiment of the invention, an apparatus comprises a first winding of at least one turn forming a primary coil, having first and second differential leads oriented in a first direction, the primary coil formed in a first conductive layer over a substrate and the first differential lead of the primary coil being grounded; and a second winding of at least one turn forming a secondary coil, having a third and fourth differential leads oriented in a second direction offset by an angle of greater than zero degrees and less than 180 degrees from the first direction, the secondary coil formed in a second conductive layer separated by an insulating layer from the first conductive layer.
Owner:NOKIA TECHNOLOGLES OY
Plane miniaturization communication band-pass filter with broadband external inhibition characteristic
The invention discloses a plane miniaturization communication band-pass filter with a broadband external inhibition characteristic. The band-pass filter with the broadband external inhibition characteristic is realized according to the structure of a plane substrate integrated coaxial line by adopting a quarter-wave resonator as a resonance unit through a partial coupling mode. The miniaturization band-pass filter which is low in loss, has the broadband external inhibition characteristic and can be integrated with a plane radio frequency microwave circuit is realized by the invention by aiming at the development requirements of plane integration and miniaturization wireless communication equipment. The miniaturization band-pass filter has the advantages that the structure is simple, the size is small, the requirement of plane circuit integration is met, the cost is low, the mass production is convenient and the like. Meanwhile, the filter has the broadband attenuation inhibition characteristic outside a passband.
Owner:SOUTHEAST UNIV
Miniaturized harmonic suppression equal-dividing power divider based on H-type defect ground artificial transmission line
ActiveCN110085959ASmall sizeWide Harmonic Suppression BandCoupling devicesHarmonic mitigationArtificial transmission line
The invention relates to a miniaturized harmonic suppression equal-dividing power divider based on an H-type defect ground artificial transmission line, which belongs to the field of radio frequency microwave circuits. The power divider comprises a dielectric substrate; a metal microstrip is arranged on one surface of the dielectric substrate, and comprises a metal microstrip surface portion of two sections of H-type defect ground artificial transmission lines, a signal input port microstrip line, signal first and second output port microstrip lines and a patch isolation resistor; each sectionof the H-type defect ground artificial transmission line has a bilateral symmetrical structure and comprises two sections of folded thin transmission lines, two sections of vertical short thin transmission lines, two sections of horizontal thin transmission lines, two sections of short rectangular open circuit branches, two sections of vertical long thin transmission lines, a section of horizontal thick transmission line, two long rectangular open circuit branches and an H-type defect ground structure etched on a metal grounding plate. Compared with the traditional power divider, the power divider disclosed in the invention has a significantly smaller size and has a good harmonic suppression capability for a wide stop band formed by the harmonics.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Method for extracting nonlinear behavior model of radio frequency microwave two-port device
ActiveCN113567793AEngineering practicabilityElectrical testingDesign optimisation/simulationModel extractionAlgorithm
The invention relates to a method for extracting a nonlinear behavior model of a radio-frequency microwave two-port device, which comprises the following steps of: measuring the radio-frequency microwave two-port device under different excitation powers by using a conventional vector network analyzer, and then converting a specific value S parameter of a power-related reflected wave and an incident wave obtained by measurement; and selecting the forward transmission coefficient S21 under the minimum excitation power as a reference value, performing normalization processing on the amplitude and phase of the S21 under different excitation powers, and generating a behavior model capable of representing the nonlinear characteristic of the tested piece. The model extraction method provided by the invention directly converts an actual measurement result, and has compatibility for vector network analyzers of different models. When the method provided by the invention is used for extracting the nonlinear behavior model of the two-port tested piece, only a vector network analyzer and a small number of accessories need to be used, and special test equipment does not need to be additionally purchased, so that the modeling cost can be reduced.
Owner:CHENGDU TECHCAL UNIV
Imaging Systems and Related Methods Including Radar Imaging with Moving Arrays or Moving Targets
Imaging systems, including radio frequency, microwave and millimeter-wave arrangements, and related methods are described. According to one aspect, an imaging system includes an antenna array, a position capture system configured to generate position information indicative of locations of one of the antenna array and the target at the first and second moments in time, and wherein the one of the antenna array and the target move between the first and second moments in time, a transceiver configured to control the antenna array to emit electromagnetic energy towards the target and to generate an output that is indicative of the received electromagnetic energy, a data acquisition system configured to generate radar data, processing circuitry configured to process the position information and the radar data to generate image data regarding the target, and an interface configured to use the image data to generate visual images regarding the target.
Owner:BATTELLE MEMORIAL INST
Standing Wave Electron Linear Accelerator and Container/Vehicle Inspection System
ActiveUS20160135278A1Inspection efficiency is lowImprove inspection efficiencyLinear acceleratorsMaterial analysis by transmitting radiationX ray spectraElectron linear accelerator
The present invention provides a standing wave electron linear accelerator comprising a modulator and a magnetron for producing radio frequency microwaves; a plurality of accelerating tubes for accelerating electrons; a microwave transmission system for feeding the microwaves into the plurality of accelerating tubes; a plurality of electron guns for emitting electron beams into the plurality of accelerating tubes; a plurality of targets impinged by the electrons from a plurality of accelerating tubes to form continuous spectrums of X-rays; a plurality of shielding devices for shielding the continuous spectrums of X-rays generated by the targets; and a microwave distributor disposed adjacent to the end of the microwave transmission system, wherein the microwave distributor has a microwave inlet and a plurality of microwave outlets for distributing the microwaves in the microwave transmission system into the accelerating tubes.
Owner:NUCTECH CO LTD
Nonlinear vector network analyzer measuring method with two-phase reference and device
ActiveCN107884621AAvoidance designAvoid implementation problemsSpectral/fourier analysisFrequency spectrumMicrowave
The invention discloses a nonlinear vector network analyzer measuring method with two-phase reference and device, which relate to the technical field of radiofrequency microwave signal measurement andcan improve the measurement ability of the nonlinear vector network analyzer towards a measured object with complicated spectrum components. The method comprises steps: measured sub frequency bands divided by a measured frequency band and overlapped frequency points corresponding to the measured sub frequency bands are acquired; first phase reference signals with the spectrum components coveringthe measured sub frequency bands are generated; a first phase difference between the first phase reference signals and pre-generated second phase reference signals in the overlapped frequency points is measured; according to the first phase difference, a second phase difference set between the measured signals and the first phase reference signals in the measured frequency points in the measured sub frequency bands is measured; and the measured sub frequency bands covered by the first phase reference signals are changed, measurement on all measured sub frequency bands is completed, and resultsare combined as a phase spectrum measurement result of the nonlinear vector network analyzer.
Owner:NAT INST OF METROLOGY CHINA
Integrated substrate gap waveguide via hole cluster feed antenna
PendingCN110768014AImproved energy transfer characteristicsReduce thicknessRadiating elements structural formsAntennas earthing switches associationEngineeringElectromagnetic radiation
Owner:YUNNAN UNIV
Broadband triple-circuit synthetic radiofrequency microwave power amplifier
PendingCN106788274AAchieve synthesisRealize the loadAmplifier modifications to raise efficiencyAmplifier with semiconductor-devices/discharge-tubesPush pullRadio frequency
Owner:GUANGDONG KUANPU TECH CO LTD
Novel radio frequency microwave energy acquisition device based on electron spin property
The invention provides a novel radio frequency microwave energy acquisition device based on an electron spin property, which comprises at least one radio frequency microwave energy conversion part. The radio frequency microwave energy conversion part comprises a first magnetic layer, a non-magnetic space layer and an energy conversion layer, wherein the first magnetic layer is connected with a radio frequency microwave signal receiving part; and the energy conversion layer accumulates positive and negative charges at the upper and lower ends of the radio frequency microwave energy conversion part to convert the radio frequency wave energy into DC signals. Compared with the prior art, the novel radio frequency microwave energy acquisition device based on the electron spin property has the advantages that the structure is simple, the size is small, the working frequency is wide and the like.
Owner:SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
Radio frequency microwave high-power device test system and test method
PendingCN113092976AImplement DC testingAccurate measurementIndividual semiconductor device testingDc currentRadio frequency
The invention provides a radio frequency microwave high-power device test system and test method. The system comprises a pulse generator which is used for generating periodic pulses; a microwave signal source which is used for generating a radio-frequency excitation signal according to the periodic pulse and inputting the radio-frequency excitation signal into the radio-frequency microwave high-power device; a direct-current stabilized power supply which is used for providing a constant direct-current signal; a pulse modulator which is used for modulating the constant direct-current signal into a direct-current pulse signal according to the periodic pulse and inputting the direct-current pulse signal into the radio-frequency microwave high-power device; a Hall current probe which is used for collecting direct current on the radio frequency microwave high-power device and converting the direct current into direct current voltage; and a high-precision digital multimeter which is used for measuring the direct-current voltage according to the periodic pulse. According to the radio frequency microwave high-power device test system and the test method, the direct current test of the radio frequency microwave high-power device is realized through the high-precision digital multimeter and the Hall current probe, and the test system and the test method are accurate and low in cost.
Owner:ZHEJIANG CHENGCHANG TECH
Detection system for tumble in shower room and detection method thereof
PendingCN110720926AEffective rescueDiagnostic recording/measuringSensorsLocal oscillator signalCurrent technology
The invention provides a detection system for tumble in a shower room and a detection method thereof. The detection system for tumble in the shower room comprises an antenna device, a microwave detection device electrically connected with the antenna device, and an alarm device. The microwave detection device comprises a signal generation module, an echo signal receiving module and a processing module, the signal generation module is used for transmitting a microwave signal; the echo signal receiving module receives the reflected radio frequency microwave signal and mixes the received transmitted and reflected echo signal with a local oscillator signal, the processing module analyzes and compares to obtain whether a person falls in the shower room, and when the processing module calculates, analyzes and compares to obtain a result that the person falls in the shower room, the alarm device gives an alarm; and when the processing module calculates, analyzes and compares to obtain that noperson falls down, the alarm device does not work. According to the technical scheme, the problem that in the prior art, the detection effect on falling of people in the shower room is poor, and consequently detection is difficult on the basis of the current technology is solved.
Owner:谢灏
Tabletop level radio frequency microwave index screening equipment and control method thereof
The invention discloses tabletop level radio frequency microwave index screening equipment. A base is included. Transmission boxes are arranged on the two sides of the base. A Y-axis track is arrangedon the top of each transmission box and is in sliding connection with sliding blocks. An X-axis track and a lead screw which are parallel to each other are arranged between the two sliding blocks. The X-axis track is in sliding connection with a grabbing mechanism. The grabbing mechanism is provided with a CCD vision camera and a mechanical arm, the lead screw penetrates through the grabbing mechanism, and the lead screw is in transmission connection with motors arranged on the sliding blocks. The base is further provided with a controller, a testing tool and a testing disc. The CCD vision camera, the mechanical arm, the motors and the testing tool are electrically connected with the controller. The tabletop level radio frequency microwave index screening equipment can automatically conduct device screening, sorting and testing, the production efficiency is high, and the multi-variety and small-batch production requirements are met.
Owner:成都云绎智创科技有限公司
Linearized model establishing method for non-linear radio frequency microwave circuit
ActiveCN101425107ADetermine component parameter valuesSolve problems with unknown scopeSpecial data processing applicationsCapacitanceSeries expansion
The invention discloses a linear model establishment method for a nonlinear radiofrequency microwave circuit, which comprises the steps: firstly, selecting a quality factor Q value of a no-load resonance loop according to a double parameter bifurcation diagram; secondly, carrying out linearization on a normalization state equation to ensure open loop gain g <*> of an oscillator; thirdly, calculating an inductance L value; fourthly, calculating a value of resistance R; fifthly, utilizing the parameter values to establish a Colpitts circuit simulation model. A nonlinear exponential function n (X2) equal to e<X>2 -1is converted to a linear function by taylor series expansion, thus the linearization conversion process of the nonlinear radiofrequency microwave circuit is realized. The establishment of the traditional Colpitts circuit linearization model needs to respectively select five parameter values which are L, C1, C2, IL and R, and the invention can ensure all the parameter values of the circuit model only by selecting the values of the quality factor Q, a current source I0 and capacitance C2.
Owner:BEIHANG UNIV
Modeling design method for ultra-wideband antenna with double notch characteristics based on FOA-GRNN
PendingCN111651936AGood forecastImprove simulation speedSimultaneous aerial operationsEnsemble learningComputational modelEngineering
The invention provides a modeling design method for an ultra-wideband antenna with double notch characteristics based on FOA-GRNN, and relates to the technical field of radio frequency microwave device neural network modeling. According to the method, training set data is extracted by selecting a sample object, basic parameters are set, a smooth factor of a generalized regression neural network isused as a parameter to be optimized, a root-mean-square error of prediction data is used as a fitness function, the smooth factor is optimized by using a fruit fly algorithm, and an FOA-GRNN networkmodel is established. The FOA-GRNN model is used to predict the miniaturized ultra-wideband antenna with the double notch characteristics, the data of the return loss | S11 | and the frequency f of the antenna is used to train the model, and the relative error of the prediction output data of the model is calculated and compared with the GRNN network. The method has the advantages of better prediction capability, high convergence rate and higher precision.
Owner:LIAONING TECHNICAL UNIVERSITY
Medium low-loss LTCC microwave dielectric ceramic material and preparation method thereof
ActiveCN112125668AHigh dielectric constantNo reactionChemical industryDielectric lossDielectric ceramics
The invention provides a medium low-loss LTCC microwave dielectric ceramic material and a preparation method thereof.The LTCC microwave dielectric ceramic material comprises a two-phase mixed ceramicmaterial, the main crystalline phase is ZnZr(1-x)TixNb2O8 of a monoclinic wolframite structure, x is 0.1-0.2, the auxiliary phase is Li2TiO3 of a monoclinic system structure, a ZnZr(1-x)TixNb2O8 pre-sintered material and a Li2TiO3 pre-sintered material are mixed according to a the weight percentage ratio of (63-67 wt%): (37-33 wt%), and then LMBBA glass accounting for 1.5-2.5 wt% of the two-phasemixed ceramic material is doped as a cosolvent and is sintered at 900 DEG C; and the component of the LMBBA glass is Li2CO3-MgO-Bi2O3-B2O3-Al2O3. The LTCC microwave dielectric ceramic material disclosed by the invention not only has a relatively high dielectric constant and very low microwave dielectric loss, but also has a temperature coefficient close to zero, and has a very high application value in LTCC radio frequency microwave devices.
Owner:YANCHUANG PHOTOELECTRIC TECH GANZHOU
Method and device for measuring nonlinear vector network analyzer with accurate phase synchronization
ActiveCN111665404AHigh phase stabilityMeet high-accuracy measurement requirementsElectrical testingTransmissionLocal oscillator signalIntermediate frequency
The invention discloses a method and a device for measuring nonlinear vector network analyzer with accurate phase synchronization. The invention relates to the technical field of radio frequency microwave signal measurement, and mainly aims to improve the phase stability measured by a nonlinear vector network analyzer by realizing coherence of a test signal and a phase reference signal so as to meet the measurement requirement of high accuracy. The method comprises the following steps: generating a clock signal and a coherent local oscillator signal by using a preset signal source; generatinga synchronous intermediate frequency signal according to the clock signal; carrying out frequency mixing processing on the synchronous intermediate frequency signal and the local oscillator signal togenerate a synchronous radio frequency signal of a frequency band to be tested, wherein the synchronous radio frequency signal comprises a first radio frequency signal and a second radio frequency signal; and measuring the nonlinear vector network analyzer of the frequency band to be tested by using the first radio frequency signal and the second radio frequency signal. The method is suitable formeasurement of the nonlinear vector network analyzer with accurate phase synchronization.
Owner:NAT INST OF METROLOGY CHINA
Chip testing device
PendingCN112327139AFlexible replacementEasy to replaceElectronic circuit testingMeasurement instrument housingTransmission channelImpedance matching
The invention relates to a chip testing device, which comprises a testing base, a radio frequency microwave detection body is embedded in the testing base, the radio frequency microwave detection bodycomprises a conductor, a radio frequency elastic probe externally wrapped by an insulating sleeve is inserted into the upper portion in the conductor, and a plurality of auxiliary grounding elastic probes are arranged on the outer side of the radio frequency elastic probe in the circumferential direction in a surrounding mode. The upper end part of the radio frequency elastic probe is in contactwith a radio frequency microwave signal port of a tested object, the lower end part of the radio frequency elastic probe is conductively connected with a radio frequency inner conductor arranged at the middle part in the conductor, a radio frequency cable is inserted into the lower part in the conductor, and a central conductor in the radio frequency cable is conductively connected with the lowerend part of the radio frequency inner conductor. According to the radio frequency elastic probe, a fuzz button structure is adopted as a main transmission channel of a radio frequency microwave signal, meanwhile, a transmission channel of a coaxial structure is also formed in the portion, making contact with a tested object, of the radio frequency elastic probe, the impedance matching effect is well achieved by arranging a compensation structure so that reflection of the radio frequency microwave signal can be reduced, and high-frequency and large-current testing can be met.
Owner:SHANGHAI AEROSPACE SCI & IND ELECTRIC APPLIANCE RES INST
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