179 results about "Radiofrequency microwave" patented technology

A process of gas purification occurs in the presence of radiofrequency microwave energy and carbonaceous material by decomposing adsorbed impurities on a bed surface at near ambient conditions of temperature and pressure. Further microwave enhanced catalytic oxidation to purificatory gases normally occurs.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses an integrated substrate gap waveguide via hole cluster feed antenna. The antenna comprises a radiation structure and an integrated substrate gap waveguide structure. The integrated substrate gap waveguide structure comprises an electromagnetic band gap structure used for shielding electromagnetic radiation energy, a feed structure used for transmitting energy, an upper dielectric plate, a lower dielectric plate and a spacing dielectric plate arranged between the upper dielectric plate and the lower dielectric plate, the radiation structure is formed on the upper surfaceof the upper dielectric plate, the feed structure is formed on the lower surface of the upper dielectric plate and is provided with a metal via hole cluster composed of at least one first metal via hole penetrating the upper dielectric plate, and the electromagnetic band gap structure is formed on the lower dielectric plate. According to the invention, a linearly polarized antenna and a circularly polarized antenna with the wide bandwidth and the high gain can be achieved, and the integrated substrate gap waveguide via hole cluster feed antenna is suitable for radio frequency, microwave, millimeter wave and terahertz wave applications, and can be used for radio frequency, microwave, millimeter wave and terahertz wave antennas, especially 5G millimeter wave antennas, such as 5G millimeterwave antennas.

The invention provides a broadband triple-circuit synthetic radiofrequency microwave power amplifier, comprising an in-phase distribution circuit connected to a radiofrequency input end, three intermediate conversions circuits and an unbalanced transmission line transformer connected to a radiofrequency output end; each of the three intermediate conversion circuits is connected in parallel and then connected respectively to the in-phase distribution circuit and the unbalanced transmission line transformer; each intermediate conversions circuit comprises an input bias matching circuit, a radiofrequency microwave push-pull transistor, an output feed matching circuit, a balanced transmission line transformer and a transmission line balun; the input end of each intermediate conversion circuit is connected in parallel through its input bias matching circuit and then connected to the in-phase distribution circuit; the output end of each intermediate conversion circuit is connected in parallel through its transmission line balun and then connected to the unbalanced transmission line transformer. The power amplifier can convert synthetic and load lines, the circuitry is simple, great bandwidth and space saving are achieved finally, and the power amplifier is suitable for radiofrequency and microwave low-frequency terminals.

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.

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.

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.

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.

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.

The invention is applicable to the technical field of radio frequency microwave assemblies, and provides a transceiving assembly, which comprises a box body, a first transceiving core group module, asecond transceiving core group module, a first cover plate, a second cover plate, a transition module and a joint module. The box body is provided with a through cavity penetrating in the vertical direction, and a transverse partition plate used for dividing the through cavity into a first cavity body and a second cavity body is further arranged in the box body. The first transceiving core group module is installed in the first cavity, and the second transceiving core group module is installed in the second cavity. The first cover plate is used for sealing the first cavity; the second cover plate is used for sealing the first cavity. And a through hole for the transition module to penetrate through is formed in the transverse partition plate. According to the transceiving assembly providedby the invention, the core group modules with different heights and the transition module for electrically connecting the core group modules are arranged, so that the core group modules fully utilizethe height space of the box body, the core group modules are prevented from excessively occupying the space in the microwave signal transmission direction, and a guarantee is provided for the miniaturization design of the transceiving assembly.

Systems, devices, and methods involving cardiac pace making are provided. Implantable wireless pace making systems, devices, and methods using electromagnetic waveforms to interact with subcutaneous implanted sensors or stimulators, or both, are described. Systems, devices, and methods can include wireless, miniaturized, battery-free, radiofrequency (RF) microwave activated, sensors or stimulators or integrated sensor/stimulators that are implanted in multiple thoracic cavity locations, and interact with a remote pace making control-module or multiple modules.