83 results about "Impedance distribution" patented technology

The invention relates to the technical field of circuit boards, and discloses a circuit board interlayer connection detection method, device and equipment, and the method comprises the steps: carrying out the electrical characteristic parameter measurement of a multilayer flexible circuit board, and obtaining the characteristic parameter data of the circuit board; designing and arranging a multi-test-point detection structure on the multi-layer flexible circuit board, and performing signal excitation to obtain test point position information; applying a differential excitation signal, and collecting a differential response waveform between the test points to obtain a time domain reflection signal feature; impedance spectrum conversion and parameter extraction are carried out on the time domain reflection signal features, and an interlayer connection impedance distribution diagram is obtained; and establishing an interlayer connection defect characteristic model aiming at nickel-based alloy wire fracture, interface cracking and liquid metal fiber felt delamination in various bending states by utilizing the interlayer connection impedance distribution diagram, so that accurate classification of defect types and severity is realized, and interlayer connection faults and surface welding quality problems can be distinguished; and the misjudgment rate is greatly reduced.

The invention discloses a new energy-based centralized area electric power analysis management method and system, and particularly relates to the technical field of photovoltaic power station fault analysis. Direct current side current, voltage and environment air pressure data are collected, an arc noise energy judgment threshold value is dynamically adjusted based on air pressure, and a current change rate difference correction coefficient is generated; a composite index of arc noise frequency band energy and voltage signal abrupt change is constructed, and an arc feature vector is generated in combination with waveform oscillation periodicity; comparing the feature vector with a preset template through a dynamic time warping matching algorithm, calculating a matching weight and a trend slope, and judging an arc reignition event in combination with a dynamic judgment threshold and a continuous increasing condition; and generating a priority breaking instruction sequence based on the event duration, controlling the breaking time sequence of the target string according to the grounding grid impedance distribution, and sending a blocking signal to the inverter in the coverage area.

The invention discloses a method for testing a polyurethane thermal insulation layer of a new energy automobile battery pack. The method comprises the following steps: simulating the operation condition of the battery pack, constructing a scenarized digital environment, and obtaining multi-condition multi-band data; arranging a virtual electrode array based on the data, applying an alternating current signal and collecting electrical information such as impedance and phase; and a three-dimensional impedance distribution map is generated through iterative inversion by combining a multi-physics field coupling model, and the defects of the polyurethane thermal insulation layer are identified and evaluated. According to the technical scheme, under the real working conditions of high and low temperature, fast charging, discharging and the like, the potential problems of cracks, delamination, bubbles and the like in the heat insulation layer can be accurately positioned, and the safety and the heat management efficiency of the new energy automobile battery pack are improved.

The invention relates to the technical field of circuit board conductivity detection, and discloses a circuit board conductivity detection method and system based on deep learning, and the method comprises the steps: obtaining high-resolution image data and circuit design parameters of a to-be-detected circuit board, and generating a circuit board feature data set; calculating theoretical impedance distribution of each area of the circuit board by using a physical constraint neural network based on the circuit board feature data set, and outputting an impedance prediction parameter set; inputting the impedance prediction parameter set and the circuit symbol rule into a neural symbol inference device to generate a conductance fault diagnosis result; and obtaining diagnosis results of a plurality of detection sites, executing cross-site diagnosis fusion, and outputting a unified circuit board conductivity detection report. The method overcomes the limitation that a traditional visual detection method cannot identify electrical characteristic defects, and solves the detection problem of hidden faults such as discontinuous impedance of the high-frequency circuit board.

The invention relates to the field of electrical impedance detection, in particular to a resistance impedance detection probe control method, device and system, and the method comprises the steps: detecting the liquid state characteristics of the environment where a resistance impedance detection probe is located, so as to estimate the liquid ion flowing space distribution information of the surface of the probe; estimating a bioelectricity signal drift change characteristic formed by liquid ions in a detection coverage range corresponding to the electrode, and adjusting an electric signal detection parameter of the electrode; adjusting signal processing parameters of signal processing ends corresponding to the electrodes on the basis of change characteristics of bioelectricity signal queues acquired by all the electrodes on the surface of the probe; and based on the resistance impedance information generated by the signal processing end and the position change information of all the electrodes on the surface of the probe in the environment, a resistance impedance distribution image is generated, so that a resistance impedance abnormal area in the environment is determined. The working state of the probe can be adjusted in the changing process of the liquid environment in the human tissue, and therefore the bio-electricity signal of the liquid environment is accurately detected.

The invention relates to the technical field of radio frequency measurement, and discloses a method for measuring the high-frequency characteristic of a radio frequency coaxial probe. The method comprises the following steps: acquiring high-frequency response data of a radio frequency coaxial probe, segmenting a full frequency band based on a predefined frequency band division strategy, and identifying a key frequency band region; according to the response amplitude and phase distribution of the key frequency band region, screening a reference frequency band and extracting an impedance reference value, optimizing impedance matching parameters of a non-reference frequency band based on the reference value, and generating a frequency band impedance optimization parameter set; recombining a full-band impedance distribution sequence according to the parameter set to generate an initial impedance matching scheme; and finally, monitoring the high-frequency transmission deviation under the initial scheme in real time, counting the impedance fluctuation quantity and the phase offset, and generating an impedance correction instruction. The method effectively improves the stability and reliability of the measurement of the high-frequency characteristic of the radio frequency coaxial probe by accurately identifying the key frequency band in a segmented manner, guiding the impedance parameter optimization by the reference value and combining a dynamic correction mechanism.

The invention provides a four-feed-source four-polarization holographic metasurface antenna based on position weighted impedance superposition, which comprises a radiation array and four feed sources, and is characterized in that the radiation array comprises M * N radiation units which are periodically arranged and are provided with I-shaped gaps in an etching manner and are of a circular patch structure; the radius of the radiation unit is determined by the maximum equivalent scalar impedance obtained by performing weighted impedance superposition on tensor surface impedance distribution obtained when single polarized electromagnetic waves are generated by taking different feed sources as centers; the inclination angle of two transverse arms of the I-shaped gap relative to the X axis is the same as the propagation direction of electromagnetic waves corresponding to the maximum equivalent scalar impedance. According to the holographic metasurface antenna, the utilization efficiency of the radiation unit on the surface waves is effectively improved through the position weighted impedance superposition method, interference among different polarization components is reduced, the defect that the aperture efficiency is low due to the fact that a traditional impedance superposition method is adopted by the holographic metasurface antenna is overcome, and the aperture efficiency of the holographic metasurface antenna is improved by exciting the four feed sources respectively. And generation of four kinds of polarized electromagnetic waves is realized.

The invention relates to the technical field of medical instruments, and provides a radio frequency gold microneedle control system based on subcutaneous impedance identification, and a radio frequency gold microneedle is provided with an electrode array for impedance tomography. Comprising the following steps: an impedance distribution reconstruction module generates reconstructed impedance distribution from a voltage signal of subcutaneous tissue collected by an electrode array through an impedance distribution reconstruction model based on a genetic algorithm; the impedance imaging module generates an impedance distribution image for reflecting subcutaneous tissue impedance distribution from the reconstructed impedance distribution through an impedance rate segmentation model based on a UNet architecture; the depth control module determines the recommended depth of the radio frequency gold microneedle according to the impedance distribution image; and the radio frequency energy control module adjusts control parameters of a control algorithm for controlling the radio frequency energy of the radio frequency gold microneedle according to the plurality of impedance distribution images. Accurate segmentation judgment and better imaging effect on impedance distribution are achieved, and then impedance imaging is applied to depth and energy pulse control of the radio frequency gold microneedle.

The invention relates to a battery contact resistance in-plane distribution estimation method and device, computer equipment and a storage medium. The method comprises the following steps: operating a to-be-detected battery under a stable operation condition, and collecting current density distribution of each region in the to-be-detected battery; each region is obtained by dividing according to a cathode flow field structure and an anode flow field structure of the to-be-detected battery; when the state of the to-be-detected battery meets a preset state condition, ohmic impedance distribution identification is carried out according to the current density of each region, ohmic impedance of each region is determined, and the preset state condition is matched with the stable operation condition; and determining the contact resistance of each region according to the ohmic impedance of each region. And the membrane is completely hydrated through high-humidity and high-current stable operation of the battery, so that the membrane impedances in different areas in the surface are approximately equal. And the accuracy of identifying the contact resistance of the to-be-detected battery is improved.

The invention discloses a BMS board card defect intelligent detection method and system, and aims to construct a circuit state spectrum library by collecting multi-domain abnormal signals to carry out frequency domain fusion, identify an abnormal impedance mode and generate defect excitation points. Performing gradient analysis on the thermal infrared distribution signal to generate a heat flow topological field, extracting an abnormal heat source position and establishing a thermoelectric coupling coordinate; injecting a sweep frequency signal at a defect excitation point to generate a defect response characteristic, and generating an enhanced detection domain through resonance amplification; performing spectral decomposition on the enhanced detection domain to identify defect resonance frequency points, and constructing a phase detection network by using multi-frequency superposition excitation and phase weaving; performing harmonic crosstalk mining based on the phase detection network and the defect impedance distribution domain to generate a defect positioning matrix; performing impedance gradient analysis on the defect positioning matrix to reconstruct a defect electric field topology, and realizing accurate defect coordinate positioning; and finally, defect type identification and severity level evaluation are completed through hierarchical labeling and echelon damage recursive chain analysis.

The invention relates to the technical field of solid fuel cells, and discloses a porous gradient anode supported solid fuel cell impedance optimization method which is applied to a system comprising a plurality of porous gradient anode impedance sensors and an optimization controller. The method comprises the steps that a sensor collects voltage and current data to generate an impedance state data set; the optimization controller constructs a regional impedance state matrix, extracts features through processing, performs impedance distribution prediction in combination with a potential gradient and the like, outputs spatial and temporal distribution features through an impedance optimization model, and updates a data set; and dynamically optimizing regional electrode parameters according to the distribution characteristics, including voltage adjustment, current aggregation, resistance distribution and other operations. According to the method, through multi-sensor distributed acquisition, multi-dimensional feature analysis and dynamic modeling, accurate prediction and parameter dynamic regulation and control of electrode impedance spatial and temporal distribution are realized, the performance and stability of the solid fuel cell are improved, and the method is suitable for the field of solid fuel cell management.

The invention discloses an electrical impedance tomography method based on a multi-layer full-connection neural network. The method comprises the following steps: acquiring voltage measurement data of a to-be-measured area of a human thoracic cavity; performing triangle subdivision on the to-be-measured region by using a finite element method to obtain a finite element model; establishing a multi-layer full-connection neural network imaging model according to the finite element model, inputting the voltage measurement data into the neural network imaging model to obtain an initial conductivity distribution sequence of the to-be-measured region, and performing normalization to obtain a training set; training a neural network imaging model by using an early stop method according to the training set to obtain an optimal solution of a network connection weight; therefore, an optimized neural network imaging model is obtained, and a reconstructed image of impedance distribution of the to-be-measured region is obtained according to the optimized neural network imaging model. According to the method, the nonlinear mapping relation between the electrical impedance imaging input quantity and the electrical impedance imaging output quantity can be better represented, and the quality and the robustness of electrical impedance imaging are improved.

The invention relates to the technical field of ice prevention and disaster reduction of high-voltage power transmission lines, and discloses a cascaded direct-current ice melting system of a high-voltage power transmission line, a control method and a device. The method comprises the following steps: inputting a test signal to the cascaded direct-current deicing system, and detecting the voltage and current of each node; calculating line impedance distribution based on the voltage and current of each node, and constructing a line equivalent model; calculating the minimum ice melting current based on the ice thickness monitoring data and the weather data, and calculating the output current of each ice melting device based on the minimum ice melting current and the line equivalent model; monitoring circulating current between systems, and calculating virtual compensation voltage based on the circulating current; and adjusting the output voltage of each ice melting device based on the virtual compensation voltage. The ice melting success rate, the safety of the system and the service life of the system can be improved.

The invention relates to the technical field of semiconductor surface cleaning, and discloses a remote plasma-assisted semiconductor etching surface cleaning method. The method comprises the following steps: configuring a remote plasma generating device and setting an initial parameter combination; then collecting surface state data of the semiconductor wafer, and constructing a surface state change matrix after multi-dimensional preprocessing; inputting the matrix into a multi-modal feature integration model for feature integration, and constructing a plasma action anomaly feature matrix according to the feature integration; iteratively optimizing the initial parameter combination by adopting a dynamic optimization algorithm, and setting device operation parameters according to the optimized parameters; a three-dimensional surface cleaning state model is constructed based on wafer surface impedance distribution data, and a mapping relation between model parameters and surface pollutant components is established; and finally dynamically adjusting device operation parameters according to the mapping relation. According to the method, through multi-dimensional data processing, feature integration, parameter optimization and dynamic adjustment, the accuracy and adaptability of semiconductor etching surface cleaning are improved.

The invention belongs to the technical field of power systems, and particularly relates to a power distribution line fault accurate positioning method and system, and the method comprises the steps: constructing a dynamic updating topological impedance library containing a topological structure, line parameters and terminal information; after a fault signal is triggered, the multiple terminals cooperatively collect a traveling wave signal and a timestamp and complete integrity verification; preprocessing the signal, and extracting a traveling wave leading edge feature point timestamp and a voltage-current amplitude ratio; determining a fault associated branch through time difference, impedance deviation and signal polarity screening in combination with topological impedance library information; tracing and simplifying a traveling wave path, and calculating an actual propagation speed initial fault distance; and correcting the distance according to the impedance distribution characteristics and converting into geographic coordinates for output. According to the method, the problems of large deviation and high misjudgment rate of a traditional positioning method are solved, the accuracy and response speed of fault positioning are improved, the fault handling time is shortened, the operation and maintenance cost is reduced, and safe and reliable operation of a distribution line is guaranteed.

The invention relates to the technical field of electronic wire harnesses, and particularly provides a processing method of an anti-interference electronic wire harness, which comprises the following steps: generating an impedance distribution curve through time domain waveform analysis, enabling the precision of the impedance distribution curve to reach ohm level, identifying a reflection peak value of a discontinuous point and a waveform baseline noise level, and determining a specific position of impedance abrupt change; according to a discontinuous point reflection peak value in the impedance distribution curve, the connector size and the via hole pitch in the confluence structure are adjusted, the path length is optimized according to the signal propagation delay time, and the reflection signal attenuation rate is reduced; constructing a confluence structure virtual model by using three-dimensional modeling software, importing the adjusted connector size and via hole pitch, setting the geometric parameter grid density as thousand points per millimeter, and generating a digital twin body; and calculating an input signal amplitude range and a vibration mode frequency range of the optimized confluence structure by adopting a frequency domain analysis method, and verifying whether the electromagnetic field coupling strength meets a matching requirement or not.

The application belongs to the technical field of power systems, and particularly relates to a distribution line fault accurate positioning method and system, which comprises a dynamic updating topology impedance library containing topology structure, line parameters and terminal information; after a fault signal is triggered, multiple terminals cooperatively collect a traveling wave signal and a time stamp and complete integrity verification; after signal preprocessing, a traveling wave front feature point time stamp and a voltage-current amplitude ratio are extracted; in combination with topology impedance library information, a fault correlation branch is determined through time difference, impedance deviation and signal polarity screening; a traveling wave path is traced back and simplified, an actual propagation speed is calculated to preliminarily determine a fault distance; and the distance is corrected according to impedance distribution characteristics and converted into geographic coordinates for output. The application solves the problems of large deviation and high misjudgment rate of traditional positioning methods, improves the accuracy and response speed of fault positioning, shortens fault disposal time, reduces operation and maintenance cost, and guarantees safe and reliable operation of the distribution line.

The invention discloses a beam forming antenna based on a holographic tensor impedance modulation metasurface and a design method thereof, and belongs to the technical field of microwave antennas. The antenna comprises a monopole feed source and a metasurface formed by a periodic array, wherein each tensor impedance unit adopts a three-layer structure comprising an upper slotted metal patch, a middle dielectric substrate and a lower metal grounding layer. A unit library of patch sizes and electromagnetic characteristics is constructed, tensor impedance distribution of each unit is calculated by adopting an iterative algorithm based on a holographic principle, and finally accurate matching with the unit library is realized. According to the invention, the surface wave can be efficiently converted into a specified target wave beam, high-gain and low-sidelobe dual-beam or flat-topped wave beam forming can be realized in a broadband, and meanwhile, the antenna has the advantages of low profile, easiness in integration and low cost, and can be widely applied to a modern wireless communication system.

The present invention discloses a method, device, equipment and medium for suppressing circulating current, including: determining an equivalent circuit model according to the circuit structure of a common DC dual-motor controller to be optimized; determining a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model; determining a target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change rule and / or the ripple current frequency change rule of the target loop; optimizing the target device according to the target parameter value to suppress the circulating current in the target loop. According to the resonance frequency change rule and / or the ripple current frequency change rule in the target loop, the present invention can determine the target device to be optimized, and then optimize the target device to suppress the circulating current in the target loop. The present invention can be used for substantially all common DC dual-motor controllers, can provide a solution direction for suppressing circulating current, reduces the process of repeated rectification in the test stage, and reduces the test cost.

The invention provides a reinforced concrete pipeline traction structure and method, and relates to the technical field of pipeline construction. According to the reinforced concrete pipeline traction structure and method, the method comprises the following steps of S1, based on multi-frequency geological radar scanning, adopting an improved back propagation neural network algorithm, extracting 12-dimensional characteristic parameters such as a stratum dielectric constant and water content through wavelet packet decomposition, constructing a three-dimensional geological model, and generating a stratum impedance characteristic matrix; through combination of multi-frequency geological radar scanning and an improved back-propagation neural network algorithm, high-precision three-dimensional modeling of stratum parameters is realized, impedance distribution characteristics under complex geological conditions are effectively identified, historical traction data are fused by adopting a convolutional long-short-term memory network, a dynamic traction prediction model is established, and a dynamic traction prediction model is established. And the real-time performance and adaptability of traction force control are obviously improved.

This invention discloses a design method, system, device, and medium for an ultra-low profile, high-aperture efficiency transmission array antenna. The method includes: simulating tensor impedance metasurface elements and obtaining the maximum equivalent scalar surface impedance corresponding to different structural parameters; establishing an impedance-structure model; designing the impedance distribution of the tensor impedance metasurface elements; obtaining the structural parameters of the tensor impedance metasurface elements through the impedance-structure model and designing a tensor impedance metasurface; simulating transmission metasurface planar elements and obtaining the transmission coefficient phase corresponding to different structural parameters of the transmission metasurface elements; establishing a phase-structure model; obtaining the structural parameters of the transmission metasurface elements under the target aperture field phase through the phase-structure model and designing a transmission metasurface plane; and designing an ultra-low profile, high-aperture efficiency transmission array antenna based on the designed tensor impedance metasurface and transmission metasurface plane. This invention significantly improves design freedom and facilitates meeting more beamforming and radiation direction design requirements.

The application discloses a radio frequency fascia layer thermal effect lifting system and method based on an anti-gravity vector, and belongs to the technical field of skin care and beauty. An initial impedance distribution diagram of a target skin area is acquired, a detection radio frequency wave is emitted, and a relative dielectric constant offset of a fascia layer relative to an epidermis layer and a dermis layer is extracted from a reflected wave signal. The offset and a depth arrangement order are input into an anti-gravity vector calculation unit, an anti-gravity vector sequence is calculated and generated, radio frequency waveform parameters matched with the vector sequence are called from a waveform database, and are loaded to a phase control array. The surface temperature and impedance changes of the target skin area are monitored in real time, impedance fluctuation feedback values are generated, and the beam pointing adjustment parameters in the subsequent anti-gravity vector are dynamically corrected accordingly until the thermal effect area construction of all target points is completed. The application accurately controls the radio frequency beam pointing through the anti-gravity vector, realizes accurate and orderly heating of the subcutaneous fascia layer, and has self-adaptive correction capability.

The invention discloses a Moore intelligent reflecting surface for realizing beam forming. The Moore intelligent reflecting surface is structurally composed of four layers of materials, wherein the first layer and the second layer are periodic metal pattern layers which have different rotational symmetry and are tightly attached, the third layer is a dielectric material isolation layer, and the fourth layer is a metal backboard layer. The Moore intelligent reflecting surface can reflect a vertical incident wave, surface impedance distribution can be adjusted by changing the style of the metal pattern layer, and beamforming of the reflected wave is achieved. By endowing the two layers of periodic metal patterns with different rotational symmetry, single-beam, two-beam and three-beam far-field directional diagrams can be formed; the two layers of metal patterns are mutually rotated along the central axis, so that continuous scanning adjustment can be carried out on the pitch angle of a reflected wave beam within the range of 0-60 degrees and the azimuth angle within the range of 0-360 degrees. The design does not need an active device, and compared with a beam forming mode of a traditional active device, the beam forming device has the advantages of being low in cost, low in power consumption, low in profile, high in reliability, not prone to breakdown and the like.

The invention relates to the technical field of network planning, in particular to a communication equipment wire harness path optimization system based on 5G base station distribution data, which comprises the following steps: receiving base station distribution data and signal frequency characteristics, establishing a dielectric constant gradient analysis model, calculating the optimal dielectric constant distribution of a wire harness insulating layer, and generating an impedance distribution matrix; calculating electromagnetic field intensity distribution of each layer based on the impedance distribution matrix to obtain a structure parameter set, establishing a comprehensive transmission loss prediction model, calculating a weight coefficient of each transmission path in combination with base station distribution data, and obtaining a dynamic path priority and a power distribution scheme; updating the network topology analysis unit based on the base station distribution data, simulating a preset base station signal change, obtaining the dynamic path priority and the robustness of a power distribution scheme in different network states, and outputting analog transmission performance data; therefore, the adaptive capacity of the system to burst network changes is improved, and signal degradation caused by path interference and load concentration is also remarkably reduced.

Example systems, apparatus, articles of manufacture, and methods to improve audio quality based on load impedance sensing are disclosed. An example apparatus disclosed herein is to cause at least one test signal to be output to an audio device, a voltage of the at least one test signal based on a default load impedance. The example apparatus disclosed herein is to execute the instructions to measure a current drawn by the audio device based on the at least one test signal. The example apparatus disclosed herein is to execute the instructions to change the voltage based on an impedance profile, the impedance profile based on the measured current.

The invention discloses a method, a system, a medium and equipment for detecting lithium battery internal resistance consistency, in the method, a to-be-detected lithium battery module is connected to # imgabs 0 # frequency superposed low-voltage power supply to measure a time domain reflection signal, and # imgabs 1 # is a natural number; fourier transform is carried out on the time domain reflection signal to obtain a frequency domain reflection coefficient spectrum, and a part corresponding to a measuring point frequency is cut out; performing inverse Fourier transform on the frequency domain reflection coefficient spectrum to obtain time domain impedance distribution, and taking a real part; respectively executing the above steps on the lithium battery module which is confirmed to be intact and the lithium battery module to be tested and has the same scale, comparing the difference of time domain impedance distribution of the lithium battery module and the lithium battery module to be tested with the impedance of the intact lithium battery module to obtain a normalized difference value, and comparing the normalized difference value with a preset threshold value; if the normalized difference value is larger than a preset threshold value, it is judged that the lithium battery module to be detected breaks down; and if the normalized difference value is not greater than the preset threshold value, judging that the lithium battery module to be detected does not have a fault.

The utility model relates to the technical field of display, in particular to a display panel and a display device, and aims to solve the technical problems of poor vertical lines and vertical Mura caused by non-uniform distribution of bonding impedance. In order to achieve the purpose, the display panel comprises a fan-out area, the fan-out area comprises a middle area, a first edge area and a second edge area, the first edge area and the second edge area are located on the two sides of the middle area respectively, and the line width of fan-out lines in the middle area is larger than the line width of fan-out lines in the first edge area and the line width of fan-out lines in the second edge area. By widening the fan-out lines in the middle area, the impedance of the middle area is reduced, the uneven impedance caused by bonding is balanced, and the technical problems of poor vertical lines and vertical Mura are solved.

The utility model discloses a transmit-receive circuit with multifunctional mesh and a transceiver, and relates to the related field of transceiver devices, the transmit-receive circuit comprises a signal receiving module, a signal processing module, a signal sending module and a multifunctional mesh module, the four modules comprise an interface circuit, a filter circuit, a coupling circuit and an impedance distribution circuit, the first antenna and the second antenna are respectively used for realizing signal receiving, filtering, coupling and impedance matching; the transceiver comprises a POE (Power Over Ethernet) port, a power supply module, a photodiode, a boosting module, a memory, a multifunctional mesh and a shell; according to the utility model, the problem of power supply is solved through the POE network port, the problem of insufficient interfaces is solved through the multifunctional mesh module, and the problem of heat dissipation is solved through the porous heat dissipation shell.

The invention discloses a multi-feed-source common-caliber OAM mode and polarization multiplexing holographic metasurface antenna design method and system, and mainly solves the problems of few OAM modes and insufficient multiplexing dimensions in the prior art. According to the implementation scheme, q feed sources are arranged at different positions, and modes and polarization modes of the feed sources are determined; excitation waves generated by each feed source and corresponding emergent waves are calculated, interference is carried out on the excitation waves and the corresponding emergent waves to obtain tensor surface impedance distribution corresponding to each feed source, and the tensor surface impedance distribution is superposed and converted into equivalent scalar surface impedance distribution; designing units satisfying equivalent scalar surface impedance distribution, and arranging the units on the common aperture surface of the feed source to form a metasurface; independently exciting a plurality of feed sources with the same polarization on the metasurface to generate corresponding modals to realize modal multiplexing; and different polarization feed sources are respectively excited to generate multi-mode wave beams, so that mode and polarization dual multiplexing is realized. According to the invention, multiple OAM modes and multiple polarizations can be multiplexed at the same aperture, dual multiplexing of the modes and the polarizations is realized, and the antenna can be used for multiple-input multiple-output (MIMO) wireless communication.

The application belongs to the technical field of electronic circuits, and particularly relates to a high-order topological insulator circuit design method based on graphdiyne structure. The method comprises the following steps: (1) establishing an LC circuit model of a two-dimensional rhombus-shaped graphdiyne structure; (2) obtaining the admittance matrix of the circuit according to the Kirchhoff equation, solving the matrix eigenvalues and eigenvectors by using MATLAB, and obtaining the admittance band structure; (3) changing the size of the capacitance proportion parameter, so that the topological phase transition of the circuit system can be realized; (4) in the topological non-trivial phase parameter region, the impedance distribution under different frequencies is calculated, and it can be observed that the system has zero energy angle state, i.e. second-order topological state; (5) the impedance distribution under a specific frequency is measured, and it is observed in the experiment that the topological angle state is localized in the obtuse angle or acute angle region of the rhombus-shaped circuit board, and the system has high-order topological properties.