77 results about "Characteristic impedance" patented technology

This application relates to the field of radio frequency (RF) power supply technology, and discloses a gain calibration method, a dynamic impedance testing method, equipment, and dielectric. The gain calibration method includes: acquiring multiple RF power measurements, where the RF power measurements are the output power measurements of an RF power supply in an open-loop state under multiple load impedance values; performing two-dimensional interpolation fitting in the complex plane of reflection coefficient based on the load impedance values ​​and the RF power measurements to obtain a continuous power distribution; selecting a minimum RF power value in the complex plane of reflection coefficient based on the continuous power distribution to obtain a target minimum RF power value; and calculating the gain of the RF power supply based on the target minimum RF power value, the load impedance value corresponding to the target minimum RF power value, and a preset characteristic impedance value. The embodiments of this application can improve the accuracy of RF power supply gain calibration and reduce the impact of environmental noise and small impedance fluctuations.

The application discloses a broadband multi-stage Gysel power divider based on an IPD process, comprising a microstrip structure layer, and first and second dielectric substrates and a ground metal layer; the microstrip structure layer adopts a multi-layer nested structure, each layer of the nested structure is formed by cascading multi-stage Gysel power division units, and is arranged on the upper surface and the interior of the first dielectric substrate, so that an integrated layout based on the IPD process is formed, and a planar spiral structure, an air bridge, a parallel plate capacitor, a thin film resistor and a layered ground unit structure are integrated; the planar spiral structure is equivalent to a specific characteristic impedance transmission line, the air bridge structure solves cross interference and suppresses a parasitic capacitor, the parallel plate capacitor structure calibrates equivalent reactance parameters, the thin film resistor effectively improves port isolation and heat dissipation, and the layered ground unit structure strengthens heat dissipation and ground reliability. The application can realize stable power distribution in a wide frequency band, and is suitable for the integration requirements of high-frequency, high-power and small-sized radio frequency front ends.

A Doherty amplifier according to the present disclosure comprises a main amplifier, an auxiliary amplifier, a distribution circuit that distributes signals to the main amplifier and the auxiliary amplifier, and a phase compensation circuit. The main amplifier has a first input matching circuit and a plurality of main amplification stages. The auxiliary amplifier has a second input matching circuit and a plurality of auxiliary amplification stages. The distribution circuit has a first line connected to the first input matching circuit and a second line connected to the second input matching circuit. The electrical length of the first line is such that the input impedance of the first line is higher than the characteristic impedance of the first line and the imaginary component is less than 10% of the real component when a small signal is input. The electrical length of the second line is such that the input impedance of the second line is higher than the characteristic impedance of the second line and the imaginary component is less than 10% of the real component when a small signal is input. The phase compensation circuit is provided in an inter-stage matching circuit of the plurality of main amplification stages or the plurality of auxiliary amplification stages.

The application provides a pad structure in a PCB and a method for optimizing the impedance of a pad in a PCB, and relates to the technical field of circuit board design. The pad structure comprises: a target pad formed on the PCB; a first transmission line electrically connected to the target pad, the line width of the first transmission line being smaller than the width of the target pad; a second transmission line electrically connected to the first transmission line, the line width of the second transmission line being smaller than the width of the target pad; and a third transmission line electrically connected to the second transmission line, the line width of the third transmission line being larger than the line width of the second transmission line. By setting the line widths of the first transmission line and the second transmission line to be smaller than the width of the target pad, a high-impedance thin line section is formed, and by utilizing the high characteristic impedance characteristic of the high-impedance thin line section, the capacitive low impedance of the wide pad itself can be effectively offset, so that the overall impedance of the pad area is improved without increasing the cost and process difficulty.

The application provides an antenna assembly, an antenna and a communication device, and relates to the technical field of communication, to solve the problem of poor electrostatic discharge capability in a radiator. The antenna assembly provided by the application comprises a floor, a radiator and a grounding network, the radiator is used for radiating or receiving electromagnetic waves, the grounding network comprises a grounding end and a connecting end, the grounding end is connected with the floor, and the connecting end is connected with the radiator; the grounding network further comprises a resistive line and an inductive structure, and the resistive line and the inductive structure are connected between the grounding end and the connecting end. In the antenna assembly provided by the application, the resistive line has a relatively high characteristic impedance, thus, the working frequency or bandwidth and other performances of the radiator are not obviously affected, the inductive structure can conduct direct current and block alternating current, thus, the static electricity in the radiator can be discharged to the floor through the grounding network, and the grounding network can obviously block high-frequency radio frequency signals, so that the working performance of the antenna assembly is ensured.

This utility model discloses a high-impedance ultra-fine signal transmission line comprising a central conductor and a first insulating layer and at least one second insulating layer sequentially disposed on its outer periphery. A shielding layer and an outer sheath are sequentially disposed outside the second insulating layer. The first insulating layer is a PFA insulating layer, and the second insulating layer is a PTFE insulating layer. This utility model solves the problem that traditional high-impedance ultra-fine signal transmission lines for medical equipment typically employ foamed PFA insulation or foamed PTFE wrapping processes to improve their characteristic impedance, but these methods suffer from difficulties in molding and poor performance.

Disclosed is an aerosol-generating device. The aerosol-generating device includes an antenna configured to radiate microwaves to an insertion space accommodating an aerosol-generating article, a source unit configured to provide a radio-frequency (RF) signal to the antenna, and a printed circuit board connected to the source unit and the antenna. The printed circuit board includes a first part including a first insulating layer and a transmission line disposed on one surface of the first insulating layer and electrically connected to the source unit and the antenna, and a characteristic impedance of the first part corresponds to an input impedance of the antenna.

The present application relates to the field of smart grid industry, and more particularly to a current source control method and system based on a phase-shifted full-bridge circuit. The method comprises the following steps: 1) calculating the disturbance of the equivalent characteristic impedance on the current source at the current moment; calculating the disturbance of the input DC voltage on the current source at the current moment; calculating the total disturbance of the current source at the current moment, and predicting the total disturbance of the current source at the next moment; 2) calculating the basic compensation of the phase-shift angle at the next moment, and then calculating the feedforward compensation of the phase-shift angle at the next moment; 3) calculating the proportional gain coefficient at the next moment; calculating the integral gain coefficient at the next moment; combining the proportional gain coefficient, the integral gain coefficient and the deviation at the next moment to calculate the closed-loop phase-shift angle adjustment at the next moment; 4) controlling the current source based on the phase-shifted full-bridge circuit based on the feedforward compensation of the phase-shift angle and the closed-loop phase-shift angle adjustment.

The application discloses a kind of λ / 4 stepped impedance transformation method and system.Therein, the method includes: in the impedance mismatching of partial discharge ultrahigh frequency load impedance and the characteristic impedance of partial discharge ultrahigh frequency measurement system, access λ / 4 stepped impedance transformation two-port network, the load impedance is wave impedance;According to characteristic impedance Z 0, wave impedance Z L And the characteristic impedance of two-section λ / 4 transmission line Z 1, Z 2, determine partial voltage reflection coefficient;According to the partial voltage reflection coefficient, determine total voltage reflection coefficient;According to the total voltage reflection coefficient, broaden the working frequency band of λ / 4 stepped impedance transformer.Therefore, break through the limitation of direct matching, by the progressive stepped impedance matching mode of sensor element, realize partial discharge ultrahigh frequency signal sensor element and subsequent radio frequency processing circuit good matching, thereby reduce the partial discharge ultrahigh frequency signal attenuation caused by impedance mismatching.

The application discloses a lithium ion battery temperature estimation method and system based on electrochemical impedance spectroscopy. The method first performs electrochemical impedance spectroscopy testing on the same type of lithium ion battery under different states of charge, different charge and discharge cycle numbers, and different temperature conditions to obtain electrochemical impedance spectroscopy data of the battery. Based on electrochemical impedance spectroscopy analysis, a characteristic frequency with low coupling degree to the state of charge and the charge and discharge cycle number and sensitive to temperature is selected, and corresponding characteristic impedance parameters are extracted. Combined with correlation analysis, electrochemical impedance spectroscopy characteristic variables suitable for temperature estimation are determined. The global optimization of hyperparameters of the extreme gradient boosting algorithm is performed by using the Canthon optimization algorithm, and a Canthon optimization-extreme gradient boosting temperature estimation model is trained. The battery electrochemical impedance spectroscopy characteristics are input into the model, and the temperature estimation result of the lithium ion battery is output. The method is suitable for electric vehicles, energy storage systems, portable electronic devices, and the like.

The utility model relates to the technical field of connector, especially a signal transmission connector of butt joint stability, including metal shell, be provided with plastic main part in metal shell, the contact terminal assembly is fixed in plastic main part, metal shell includes a slot, and the contact terminal assembly is located in the slot, and the contact terminal assembly includes lower row terminal assembly and upper row terminal assembly, and the lower row terminal assembly includes lower row metal terminal and lower row injection fixing part, and the lower row metal terminal and lower row injection fixing part are integrally formed through injection fixing, and the upper row terminal assembly includes upper row metal terminal and upper row injection fixing part, and the upper row metal terminal and upper row injection fixing part are integrally formed through injection fixing. Compared with prior art, the signal transmission connector of butt joint stability of the utility model can effectively reduce the assembly difficulty through respectively using plastic injection fixing to the upper and lower row metal terminal, and then carries out subsequent assembly, is convenient for tuning characteristic impedance, is convenient for assembly, and is favorable to improving assembly efficiency.

This application provides a radio frequency (RF) front-end module and an electronic device. The RF front-end module has a connection port for connecting to a signal port via a first inductor. The RF front-end module includes a substrate, a low-noise amplifier (LNA), and a microstrip line. The substrate has the connection port, and the LNA is mounted on the substrate. The LNA includes an input port. The microstrip line is mounted on the substrate, with a first end connected to the connection port and a second end connected to the input port of the LNA. The microstrip line has a characteristic impedance greater than 50 ohms. By connecting a microstrip line with a characteristic impedance greater than 50 ohms in series between the input port of the LNA and the connection port of the RF front-end module, the real part of the input impedance of the input port can be increased, improving the matching performance and thus increasing the gain of the LNA.

This application discloses a filtering trace structure, device, and flexible circuit board. The filtering trace structure includes at least one high-impedance trace and at least one low-impedance trace. The high-impedance and low-impedance traces are alternately arranged and connected in series. The characteristic impedance of the high-impedance trace is greater than a preset threshold, and the characteristic impedance of the low-impedance trace is less than the preset threshold. By alternately arranging and connecting at least one high-impedance and at least one low-impedance trace in series, a transmission line structure with periodic impedance changes is formed. The filtering effect is achieved by utilizing the impedance mismatch effect between the high-impedance and low-impedance segments, thereby directly integrating the filtering capability into the signal trace and effectively suppressing radio frequency interference.

This invention belongs to the field of semiconductor packaging and antenna technology, specifically an AiP packaged antenna structure and fabrication method that is easy to mass-produce, including a substrate layer, a redistribution layer, a molding insulating layer, and an antenna radiating layer; characterized in that a vertical coaxial interconnect component is embedded in the molding insulating layer, which includes a central signal conductor, an inner dielectric sleeve, and a metal shielding wall; the central signal conductor connects to the signal path, and the metal shielding wall connects to the ground plane to form a closed electromagnetic channel; through the above solution, this application achieves precise control of characteristic impedance, improves channel isolation, reduces transmission loss, and improves mass production yield through modular technology.

An ultrawideband flexible THz absorber based on a structured water layer is characterized by comprising a four-layer structure, from top to bottom: the first layer is a dielectric layer; the second layer is a structured water layer, which is a cuboid with a hemisphere on top; the third layer is the same dielectric layer as the first layer; and the fourth layer is a conductive glass layer. By introducing the structured water layer, the characteristic impedance of the absorber can be well matched with the free-space impedance across an extremely wide frequency band, thus maintaining extremely high absorption across this wide range. The interface between the first dielectric layer and the second structured water layer, and the fourth metal reflective layer, constitute a Fabry-Perot resonant cavity with a continuously varying cavity length. This causes electromagnetic waves with continuously varying wavelengths entering the absorber to undergo multiple reflections and destructive interference within the cavity until they are completely absorbed.

An electric wire inspection system and method that can sensitively detect damage on an electric wire, and an electric wire capable of being inspected using the same. The electric wire inspection system includes: an inspection unit which performs electric wire inspection wherein a characteristic impedance between two conductive members of the electric wire is obtained as a response signal by time domain or frequency domain reflectometry; a storage unit which stores the response signal obtained at a first time point; and an analysis unit which retrieves the response signal obtained at the first time point from the storage unit, compares it with the response signal obtained at a second time point later than the first time point, and, if a difference exists between the two response signals, correlates a region in which the difference exists in the response signals with a position along an axial direction of the electric wire.

The application discloses a flat-plate cascade linear folded pulse generator and belongs to the technical field of pulse power devices, and solves the technical problems of low output index and large volume of the pulse generator. The pulse generator comprises a first flat-plate conductor, a second flat-plate conductor, a third flat-plate conductor, a load and a switch. The first flat-plate conductor, the second flat-plate conductor and the third flat-plate conductor are arranged in parallel, the first flat-plate conductor and the second flat-plate conductor form a first flat-plate line, and the second flat-plate conductor and the third flat-plate conductor form a second flat-plate line. The first flat-plate line and the second flat-plate line are cascaded. The left end of the first flat-plate line is open, and the second flat-plate line is connected with the load and the switch in series. The first flat-plate line and the second flat-plate line are equal in length and equal in characteristic impedance. During operation, the first flat-plate line and the second flat-plate line are charged simultaneously. The application is used for a pulse power generator.

The application belongs to a high-sensitivity sensing circuit based on transmission valley degeneracy, a sensing method and a pressure sensor, and the sensing circuit comprises: a first LC resonator and a second LC resonator, the first LC resonator and the second LC resonator are weakly coupled with a transmission line with a predetermined characteristic impedance; a coupling element connected between the first LC resonator and the second LC resonator for realizing the coupling between the two resonators; and a signal extraction device for extracting the scattering parameter of the transmission line; wherein the first LC resonator and the second LC resonator are used to make the sensing circuit work at the transmission valley degeneracy point by adjusting the coupling element and the external coupling element, and when the coupling element is disturbed, the splitting of the spectral line valley in the reflection spectrum occurs. The application significantly improves the output signal-to-noise ratio and solves the contradiction between sensitivity and noise.

A connector is provided that improves the characteristic impedance of a UTP module. The connector includes a first connector (10) and a second connector (11) that can be mated with each other. The first connector (10) has a UTP module (15). The UTP module (15) has a UTP inner conductor (65) that is connected to a wire (53) of a UTP cable (12). The second connector (11) has a conductive shielding member (21) that covers the outer periphery of the UTP inner conductor (65) when the first connector (10) and the second connector (11) are mated.

The application discloses a transverse feedback excitation device with high shunt impedance and horizontal light extraction, and belongs to the technical field of particle accelerators. The device comprises a beam position probe (BPM), an RF front end, an ADC module, a digital signal processing module, a DAC module, a power divider, a power amplifier, a low-pass filter, an exciter (Kicker) and a matching load. The exciter Kicker has four electrode strips located on both sides of the beam center line and parallel to each other, two electrode strips on the same side are connected in parallel, the characteristic impedance of a single electrode strip is 100Ω, and the equivalent total characteristic impedance after parallel connection is 50Ω; the four electrode strips are distributed in a quadrangular symmetry in the cross section of the vacuum chamber and avoid the horizontal median plane, so as to form an open light path channel. The application improves the shunt impedance of the exciter, reduces the radio frequency power demand, realizes impedance matching with a standard 50Ω system, and guarantees the horizontal unobstructed extraction of the synchrotron radiation light.

The application relates to the technical field of automation monitoring, in particular to a PCB characteristic impedance tolerance automatic monitoring method and system, which comprises the following steps: extracting waveform extreme value coordinates to calculate offset and construct a correction sequence, performing coordinate mapping on a voltage waveform, adjusting to obtain a reconstructed waveform, calculating a waveform inflection point time interval and a compression ratio, collecting a dielectric constant quantization propagation delay, accumulating to construct a position sequence, associating the reconstructed waveform with the position sequence to construct a space-time matrix, calculating a regional impedance difference value, inputting a support vector machine model to output an abnormal category. In the application, the derivative of the waveform is extracted to calculate the offset, the coordinates are corrected to eliminate misplacement interference, the compression ratio is calculated to extract fluctuation characteristics, the dielectric constant propagation delay is quantized, the space-time characteristics and the impedance difference value are fused to be input into the support vector machine model for classification, multi-dimensional correlation information is effectively mined, and the impedance abnormality monitoring accuracy is improved.

The application discloses a swing enhancement type voltage mode driver and belongs to the technical field of integrated circuits. The driver comprises a driving switch, a controllable matching impedance and a swing enhancement module. The controllable matching impedance is adjusted in resistance value by a single controllable impedance MOS tube and a DAC, and replaces a traditional large-scale MOS array to save area. The swing enhancement module adopts a cascode current source structure, is controlled by the DAC to inject a current, and improves output swing without changing a power supply voltage and without destroying impedance matching. The application is suitable for various characteristic impedance transmission protocols, has stable output common-mode voltage, is suitable for a SERDES chip of 28 nm and below CMOS process, and has the advantages of low power consumption, small area and strong driving capacity.

The application discloses a kind of cable health state evaluation method and system based on single-end open circuit impedance spectrum, belong to nondestructive testing and impedance spectrum analysis technical field.This method only needs to carry out frequency sweep test at one end of cable and keep open circuit at the end, after obtaining wideband input impedance spectrum, extract real part data and identify resonance extreme point;The upper and lower envelope lines are constructed by extreme point interpolation, and the high-frequency characteristic impedance and attenuation constant of the full frequency band are derived;Further, the distributed parameters of the cable are calculated by combining the phase constant.By comparing the characteristics of the distributed parameters, the health status of the cable can be accurately evaluated, and the physical mechanism can effectively distinguish between thermal aging and moisture damage.The application eliminates the cumbersome of double-end cooperation test, does not need to intercept samples, greatly saves the test time, has wide applicability and strong anti-interference ability.

A time domain reflectometry (TDR) controlled-impedance testing system includes one or more ultra-low impedance testing channels (e.g., having a characteristic impedance of less than 10 ohms, or less than 5 ohms, or less than 2 ohms) to couple a test signal to a test target ("device under test"). In one example, the TDR testing system includes one or more printed circuit boards (PCBs) on which at least a portion of the testing channel is implemented. The PCB includes an ultra-wide impedance-controlled trace and one or more return conductors constituting at least a portion of an ultra-low impedance PCB RF transmission line having a characteristic impedance of less than 10 ohms (or less than 5 ohms, or less than 2 ohms).

The application relates to an asymmetric coupling broadband balun based on low-temperature co-fired ceramics, which adopts an LTCC multilayer circuit process, uses ceramic powder as a medium substrate raw material, selects silver as a metal conductor and embeds the metal conductor in multilayer ceramics, divides a main circuit into a, b, c and d four-layer structures, realizes interconnection of conductors in each layer through vertical through holes between layers, adopts spiral wide-side coupling lines, and distributes the coupling lines on different layers to adapt to the requirement of characteristic impedance with large difference, the conductor in the c layer has the multifunctional role of the 'ground' of the a and b layers and a short-circuit line formed by the ground layer, and the conductor in the d layer is responsible for the connection of external electrodes and internal circuits. The balun is packaged in the form of a surface-mounted device. The application relies on LTCC materials and design technology, realizes miniaturization and surface packaging of the ultra-wideband balun through multilayer integration, bent coupling lines and functional reuse design, conforms to the LTCC process specification, is convenient to assemble, and is suitable for compatible connection of single-ended and differential devices in various radio frequency circuits.

The application relates to the technical field of communication, and provides a feeding switching device connected with an antenna, which comprises a feeding conversion piece used for electrically connecting with a nano-silver antenna in an insulating transparent hard base material, a part of the feeding conversion piece is used for adhering connection with the insulating transparent hard base material, the feeding conversion piece is a flexible piece, and the impedance of the feeding conversion piece is used for jointly reaching a preset impedance of an antenna body with the impedance of the nano-silver antenna. Through the technical scheme, the feeding switching device can be electrically connected with the nano-silver antenna in the insulating transparent hard base material, the characteristic impedance matching of the antenna body is realized, and the antenna signal is ensured to be low-loss transmitted to a radio frequency module end through the feeding switching device.

The present invention relates to a differential pair noise suppression structure. A circuit board includes at least one substrate having opposite first and second surfaces. A pair of plated vias are disposed along a z-axis. The first surface of the substrate is provided with a first metal line, a second metal line, a first plated via opening, and a second plated via opening to form a differential pair circuit structure. A metal ground is provided on the second surface of the substrate, the metal ground having a blank area. From a projection perspective, the metal ground area encompasses both signal lines to eliminate reflection noise caused by a boundary between the blank area and the metal ground so that the differential pair signal lines have a uniform characteristic impedance.