477 results about "Electromagnetic coupling" patented technology

The invention relates to the technical field of fault testing, in particular to a dry-type air-core reactor turn-to-turn short circuit monitoring method based on a magnetic field difference method. According to the method, regularization constraint is introduced in an initial baseline stage to construct a reference electromagnetic coupling matrix, a heat accumulation index is recursively analyzed based on three-phase current energy, a thermally-induced magnetic field drift model is fitted in combination with magnetic field residual errors, and combined with combined constraint of the reference electromagnetic coupling matrix and the thermal drift model, a three-phase electromagnetic coupling model is established. The normal thermally induced magnetic field drift component is dynamically stripped in real-time monitoring; and under the constraint of a reference electromagnetic coupling matrix, fitting and optimizing a current vector through weighted least square state estimation, and integrating magnetic field and current two-dimensional deviation to obtain a structure consistency deviation index for fault monitoring. According to the invention, monitoring is carried out in consideration of a linear electromagnetic transfer rule and nonlinear thermal drift compensation, a complex magnetic field environment and a variable load operation condition of the dry-type air-core reactor are adapted, and continuous and reliable monitoring guarantee is provided for long-term stable operation of equipment.

A power transmission tower grounding resistance non-contact measurement method based on the electromagnetic coupling principle comprises the following steps that transmitting and receiving electromagnetic coupling coils are arranged around an iron tower grounding body, and geometric calibration and spatial positioning of a measurement area are completed by combining grounding grid structure parameters and soil conduction characteristics; injecting a high-frequency alternating-current excitation signal into the transmitting coil, and synchronously acquiring the amplitude and phase response of the induced voltage at a receiving coil end; carrying out filtering processing on the induction signal by adopting a time-frequency analysis and phase decoupling algorithm, and solving a function relationship between electromagnetic response and grounding impedance by combining a coupling equivalent model; based on experimental calibration data and scene parameters, a nonlinear mapping model of induction response and grounding resistance is constructed, and real-time inversion calculation is carried out by combining a solving result obtained in the third step. According to the invention, the real-time accurate measurement of the grounding resistance under the conditions of no power failure and no wire breakage is realized, and the safety, the operation convenience and the anti-interference capability in a complex environment in the measurement process are obviously improved.

The invention discloses an electromagnet electromagnetic ultrasonic thickness measurement method and system based on an anti-collision unmanned aerial vehicle, and relates to the field of nondestructive testing, and the method comprises the steps: obtaining the coordinates of a preset detection point, controlling the flight path of the unmanned aerial vehicle, and determining the safety position information of the unmanned aerial vehicle located near the preset detection point; the motion of the multi-degree-of-freedom mechanical arm is controlled through a servo motor and an encoder, contact impact is reduced through a buffer mechanism, and attitude information of the electromagnetic ultrasonic sensor unit aligned with the surface of the to-be-detected object is determined; the magnetic attraction force is adjusted in real time through a closed-loop feedback system, and a linear frequency modulation pulse is adopted as an excitation signal to obtain an echo signal containing acoustic-electromagnetic coupling interference; acoustic-electromagnetic coupling interference is corrected and processed in an auxiliary mode through a multi-mode signal separation algorithm and machine learning, and final thickness data is obtained; and transmitting the final thickness data to a cloud platform, and providing a data visualization interface and an alarm function on the cloud platform. According to the invention, accurate thickness detection and remote monitoring of a complex structure material can be realized.

The invention provides a direct heating type reconfigurable intelligent metasurface based on a phase change material and a preparation method thereof, the metasurface is composed of a plurality of metasurface units arranged in an array mode, and each metasurface unit comprises a substrate, a first dielectric layer, a middle metal layer, a second dielectric layer and a phase change material layer which are sequentially arranged from bottom to top; the two sides of the phase change material layer are respectively provided with a metal patch of a metal radiation patch structure. A contact electrode is arranged in the substrate; the first dielectric layer and the second dielectric layer are insulating layers, a first vertical through hole and a second vertical through hole are further formed in the metasurface unit, the metal patch radiation structure and a contact electrode of the substrate form an electrical path flow through the first vertical through hole and the second vertical through hole, and the current flows through the phase change material layer to drive the phase change material to generate crystalline state / amorphous state conversion. And an equivalent conductive path, electromagnetic coupling strength or local impedance between the metal patch radiation structures is changed in different phase states.

The invention relates to a cast-rolling casting nozzle with an electric-magnetic coupling oscillation effect. Relates to a cast-rolling casting nozzle with an electromagnetic oscillation effect, which is matched with a horizontal double-roller cast-rolling machine in the field of aluminum alloy die casting. The method is used for solving the inevitable internal macrosegregation defect of the high-alloy-content aluminum alloy cast-rolled product. The device comprises an L-shaped electrode pair 1; a side seal 2; an excitation device 3; a guide plate 4; a cooling water pipe (inlet / outlet) 5; a copper enameled wire (excitation) 6; a countersunk self-tapping screw 7; a casting nozzle upper plate 8; a rhombic shunting block 9; a nozzle lower plate 10; and a casting nozzle bottom plate 11. In the casting and rolling process, an oscillating electric field and a steady magnetic field are introduced, electromagnetic coupling force is generated at the outlet end of a casting nozzle, the electromagnetic force effectively stirs a semi-solid aluminum alloy melt, and therefore the purposes that alloy is evenly distributed, and segregation defects are reduced or even eliminated are achieved. The method is used in 4-series, 6-series and 7-series aluminum alloys, and the effect is obvious.

The invention relates to the field of force-electromagnetic coupling measurement, and discloses a low-voltage electric energy metering box internal arrangement method and system based on a modular mutual inductor plugging structure, and the method comprises the steps: synchronously collecting three-phase module magnetic flux density, base strain field and pre-tightening force time sequence data through deploying a multi-source sensor; a directed weighted hypergraph is constructed to represent a magnetoelastic coupling topology, the topology is converted into a time-varying creep rate matrix through a viscoelastic creep memory operator, a compensation strategy is generated in combination with phase space division and a magnetostriction response tree, and finally an optimization scheme of module spacing and interface rigidity is reversely mapped. By accurately capturing the time-varying mechanical law of the strain field and the pre-tightening force, the problem of time-varying coupling drift of the modular mutual inductor caused by structure-electromagnetic coupling and viscoelastic memory effect is solved, the limitation of traditional static independent calibration is broken through, and long-term stability of three-phase metering precision is achieved.

The invention provides a flywheel energy storage system with an electromagnetic coupler, which comprises a motor, a flywheel rotor, the electromagnetic coupler, a frequency converter and a generator, and is characterized in that the motor is connected with the flywheel rotor to drive the flywheel rotor to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, and the outer rotor sleeves the inner rotor and is spaced from the inner rotor; the flywheel rotor is in transmission connection with the inner rotor, the inner rotor generates a rotating magnetic field to drive the outer rotor to rotate, and the frequency converter is connected with the outer rotor to change the current frequency of the outer rotor so as to change the magnetic field rotating speed matched with the current, so that the mechanical rotating speed of the outer rotor is kept constant. The generator generates power, accesses the power grid and inputs electric energy with stable frequency into the power grid, the requirement of power transmission to the power grid is met, power electronic devices are not needed, rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, and the capacity of the power grid for efficiently accepting new energy is improved.

The invention provides a low-profile circularly polarized antenna unit for slot coupling feed and an array thereof, and the antenna unit employs a plurality of metal layers which are coaxially arranged, are sequentially stacked up and down and are separated through dielectric layers, thereby achieving the high integration of a feed network, a coupling structure and a radiation unit in the vertical direction of the antenna unit. Specifically, the parasitic patch and the radiation patch which are stacked and coupled up and down are adopted, so that the working bandwidth of the antenna unit is expanded; furthermore, the interference of a feed network on the radiation performance of the antenna is reduced through the separation of the upper metal ground and the lower metal ground, and meanwhile, two orthogonally distributed gap structures formed in the upper metal ground are matched with the microstrip transmission line to perform coupling feed, so that the circular polarization performance of the antenna unit is improved; in addition, periodically arranged metallized shielding through holes are formed in the edges of the antenna units, so that surface wave propagation and electromagnetic coupling between the units are effectively inhibited, and the performance stability of the antenna unit during large-angle scanning is improved while the low-profile characteristic of the antenna unit is ensured.

The invention relates to the technical field of high-voltage cable intelligent monitoring, and discloses a high-voltage cable multi-mode fault diagnosis method, system and device based on a space-time heterogeneous graph neural network and a medium, and the method comprises the steps: constructing a space-time heterogeneous graph fusing the physical connection and electromagnetic-thermal field coupling relation; respectively extracting physical connection features and electromagnetic coupling features by adopting dual-channel convolution; modeling a time dependency using a timing gating unit; introducing heat conduction and Joule heat effect constraints into the loss function; and fault classification and three-dimensional positioning are realized based on an attention mechanism. According to the invention, by fusing multi-source monitoring data and physical rules, early warning, accurate positioning and dynamic risk assessment of cable faults are realized.

The utility model relates to the technical field of motors, in particular to an integrated joint motor, which comprises a rotor comprising a rotor upper cover and magnetic steel arranged on the rotor upper cover; the harmonic reducer comprises a wave generator, a flexible gear and a gear, the wave generator is fixed on the rotor upper cover and drives the flexible gear, and the flexible gear is meshed with the gear; the connecting shaft is connected with the rotor and an output shaft of the harmonic reducer; the stator is fixedly arranged and forms an electromagnetic coupling gap with the magnetic steel; wherein the gear is fixedly connected with the output fixing seat, and the first stator is installed on the periphery of the output fixing seat and the gear. The robot joint is small in size, light in weight, high in torque output, high in output position control precision, high in power density and high in output position control precision, and is suitable for robot joints which have requirements for weight and space and are high in torque and control precision.

The invention relates to the technical field of motor control, and discloses a torque adjustment control method of a magnetic stirrer based on sample characteristics, which comprises the following steps: acquiring an armature three-phase current and a rotor position signal, and converting the armature three-phase current and the rotor position signal into a quadrature-axis actually measured current and a direct-axis actually measured current by utilizing coordinate transformation logic; extracting a magnetic declination estimated value reflecting the phase lag degree of the stirrer based on an electromagnetic coupling model; calculating a magnetic declination change rate according to the magnetic declination estimated value of the continuous sampling period; a transient compensation current is generated by adopting a nonlinear compensation operator and combining a real-time synchronous torque coefficient; according to the invention, the transient characteristics of the magnetic declination are utilized to realize the real-time sensing of the load disturbance, the magnetic coupling slippage caused by the sudden change of the characteristics of the sample is effectively inhibited, and the stability of the magnetic declination is improved. And the ineffective temperature rise of the motor is reduced while the system stability is guaranteed.

The invention relates to the technical field of nuclear magnetic resonance, and provides a broadband tuning system for a high-field nuclear magnetic resonance coil. The system comprises a radio frequency coil, a radio frequency shielding layer and a driving mechanism, the radio frequency shielding layer and the radio frequency coil are coaxially arranged in the axial direction, and the radial size of the radio frequency shielding layer is larger than that of the coil. The driving mechanism drives the radio frequency shielding layer and the radio frequency coil to generate axial relative movement, so that the axial overlapping length between the radio frequency shielding layer and the radio frequency coil is continuously changed. According to the system, the electromagnetic coupling strength between the radio frequency shielding layer and the radio frequency coil can be adjusted through mechanical displacement, then the equivalent inductance of the coil is changed, and finally continuous and broadband tuning of the resonant frequency of the coil is achieved. According to the invention, traditional capacitance tuning is replaced by pure physical mechanical adjustment, so that the physical limitation and parasitic effect of micro capacitance in a high field are effectively avoided, the uniformity of a radio frequency magnetic field is maintained on the premise of not changing the structure of the coil, and the compatibility and stability of high-field and multi-core detection are effectively improved.

The invention relates to the technical field of energy storage converters, and discloses a grid-connected and off-grid switching photoelectric control device for PCS (Power Control System) equipment, which is characterized in that a double-isolation barrier of a power grid side and a control side is constructed through photoelectric isolation and photoelectric conversion processing of a control signal between a main controller and a power grid controller; intrusion paths of interference signals such as voltage fluctuation and surge are thoroughly blocked, a control loop is prevented from being influenced by electromagnetic coupling interference from the source, the risk of false triggering of a control instruction is effectively reduced, and stability and accuracy of control signal transmission in a complex power environment are ensured.

The utility model discloses a wireless charging assembly and charging equipment, and the wireless charging assembly comprises a charging pedestal which is installed below an installed object, and is internally provided with a first mainboard and a first coil electrically connected with the first mainboard; the transfer pad is mounted above the mounted object, an electromagnetic induction coil and a signal conversion circuit electrically connected with the electromagnetic induction coil are arranged in the transfer pad, and the signal conversion circuit is used for enhancing an electric signal converted by the electromagnetic induction coil; wherein the first coil and the electromagnetic induction coil transmit energy through electromagnetic coupling. The charging device comprises a second main board and a second coil electrically connected with the second main board, and the second coil is used for transmitting energy with the electromagnetic induction coil of the wireless charging assembly through electromagnetic coupling. According to the utility model, through the design of the transfer pad, distance attenuation is effectively compensated, the receiving distance of charging is prolonged, and stable charging and state communication can be realized in a large range.

The invention provides an electro-thermal-magnetic-force coupling field finite element simulation life prediction method for a board-level electronic packaging device, relates to the field of electronic packaging reliability analysis and finite element simulation, and aims to solve the problems that life prediction depends on single / partial field coupling, neglects the influence of electromagnetic force and magnetic field, lacks a multi-field transmission mechanism, and cannot predict the life of the board-level electronic packaging device. Therefore, the problems of large prediction deviation and incapability of realizing full-field coupling are solved. According to the method, a real welding spot model is firstly built and repaired, a board-level packaging three-dimensional structure subdivision grid is constructed, electromagnetic force and additional heat are obtained through electro-magnetic coupling, heat-force coupling loading is input to calculate heat stress, at least two fatigue models are substituted, and the service life of a key welding spot is calculated. Electro-thermal-magnetic-force full-coupling simulation is achieved, life prediction precision is improved through multi-model fusion, multi-package and multi-load adaptation is achieved, a reliable basis is provided for electronic package design, the test period is shortened, the experiment cost is reduced, and development of package reliability research towards multi-field life prediction is promoted.

The invention relates to an electromagnetic sensor based on a split-ring resonator array and a crack detection method, the sensor comprises a first flexible dielectric substrate, a bonding layer, a second flexible dielectric substrate and a metal grounding layer which are bonded from top to bottom, and the top surface of the first flexible dielectric substrate is provided with a microstrip transmission line; one end of the first flexible dielectric substrate is provided with an SMA interface hole, and the bottom surface of the first flexible dielectric substrate is provided with a split-ring resonator array which is in electromagnetic coupling with the microstrip transmission line. The invention also provides a crack detection method of the sensor. The electromagnetic sensor is adjustable in detection area and uniform in field distribution.

The invention relates to a system comprising a heat sink (200) and a transformer (100), said transformer comprising an electronic circuit board (102) having an electrically conductive track, a first rigid electrical conductor (104, 106), a primary including at least the electrically conductive track of the electronic circuit board (102), a secondary including at least the first rigid electrical conductor (104, 106); and an electromagnetic coupling core (108) of the primary and secondary, the first rigid electrical conductor (104) comprising at least one open loop around a central leg (108C) of the electromagnetic coupling core (108) and at least one thermal connection (1041), said thermal connection (104) extending from said open loop to the outside of said open loop, said thermal connection (1041) being in thermal contact with said heat sink (200). Figure for the abstract: Fig.1.

The invention discloses a multi-channel high-precision liquid injection device for DNA synthesis and a method thereof, and relates to the field of deoxyribonucleic acid synthesis equipment.The multi-channel high-precision liquid injection device comprises a device shell; the movable mounting box is arranged at the bottom in the device shell in a sliding mode, a mounting groove is formed in the top of the movable mounting box, a clamping plate is arranged at the top in the mounting groove, and a plurality of combined columns are arranged on the clamping plate; and the cover plate is rotationally arranged on the fixed plate through a connecting rod. According to the invention, through the modularized liquid injection head assembly and the flexibly configured sequence identification system, the device can carry out multiple groups of different DNA synthesis operations at the same time, so that the synthesis flux and flexibility are obviously improved; by means of the driving and guiding mechanism and the electromagnetic coupling technology, efficient and accurate positioning of the liquid beating head in a two-dimensional plane is achieved, and the contradiction between multi-channel processing and positioning accuracy is solved.

This invention relates to the field of fault testing technology, specifically to a method for monitoring inter-turn short circuits in dry-type air-core reactors based on the magnetic field difference method. This method constructs a reference electromagnetic coupling matrix by introducing regularization constraints in the initial baseline stage. Based on the recursive analysis of the three-phase current energy thermal accumulation index, it combines the magnetic field residual to fit a thermally induced magnetic field drift model. By combining the joint constraints of the reference electromagnetic coupling matrix and the thermal drift model, the normal thermally induced magnetic field drift component is dynamically removed during real-time monitoring. Under the constraints of the reference electromagnetic coupling matrix, the current vector is optimized through weighted least squares state estimation. The structural consistency deviation index is obtained by comprehensively considering the dual-dimensional deviations of the magnetic field and current for fault monitoring. This invention balances linear electromagnetic transfer laws with nonlinear thermal drift compensation for monitoring, adapting to the complex magnetic field environment and variable load operating conditions of dry-type air-core reactors, providing continuous and reliable monitoring assurance for the long-term stable operation of the equipment.

This invention relates to the field of electronic measurement technology and discloses an online measurement method and system for the quality factor of resonant circuits. The method involves injecting a small-amplitude sinusoidal disturbance signal into the excitation end of the resonant circuit under test using weak electromagnetic coupling, extracting the amplitude and phase of the disturbance response using lock-in amplification technology, performing Lorentz fitting on the frequency response curve to calculate the negative 3 dB bandwidth, outputting the quality factor in real time from the ratio of the resonant frequency to the bandwidth, introducing cross-correlation narrowband filtering to compress the equivalent noise bandwidth to below 1 Hz, and having an automatic resonant frequency tracking function.

This invention relates to the field of force-electromagnetic coupling measurement, and discloses a method and system for the internal arrangement of a low-voltage power metering box based on a modular transformer plug-in structure. This method deploys multi-source sensors to synchronously collect time-series data on the magnetic flux density of the three-phase modules, the strain field of the base, and the preload. A directed weighted hypergraph is constructed to represent the magnetoelastic coupling topology, which is then converted into a time-varying creep rate matrix using a viscoelastic creep memory operator. Combined with phase space partitioning and a magnetostrictive response tree generation compensation strategy, the final result is an inverse mapping to an optimized scheme for module spacing and interface stiffness. This invention solves the problem of time-varying coupling drift caused by structure-electromagnetic coupling and viscoelastic memory effects in modular transformers by accurately capturing the time-varying mechanical laws of the strain field and preload, overcoming the limitations of traditional static independent calibration, and achieving long-term stability of three-phase metering accuracy.

A method of testing a semiconductor device. An apparatus comprising a semiconductor device and a testing apparatus. The semiconductor device comprises an integrated circuit and a plurality of external radiating elements at a surface of the device, the radiating elements comprising transmitting elements and receiving elements. The testing apparatus comprises a surface placed against the surface of the device. The testing apparatus further comprises at least one waveguide extending through the testing apparatus for routing electromagnetic radiation transmitted by one of the transmitting elements of the device to one of the receiving elements of the device. Each waveguide comprises a plurality of waveguide openings for electromagnetic coupling to a corresponding radiating element of the plurality of radiating elements located at the surface of the device. A spacing between the waveguide openings of each waveguide is greater than or less than a spacing between the corresponding radiating elements.

The invention belongs to the technical field of water treatment, and provides a self-cleaning water treatment module and a purification technology.The self-cleaning water treatment module comprises an equipment shell, a multi-stage filter unit is arranged in the equipment shell, an electromagnetic coupling cleaning module is arranged on the periphery of a filter element of the filter unit, and the outer side of the equipment shell is connected with a bipolar circulation switching module; the electromagnetic coupling cleaning module is electrically connected with the control box, the bipolar circulation switching module is in signal interaction with the control box through a water pressure sensor, and a blow-off pipe is arranged at the bottom of the filter unit; according to the water purifier, reversible switching of the water flow direction is achieved through the bipolar circulation switching module, disassembly-free cleaning is conducted on the filter element in cooperation with the electromagnetic coupling cleaning module, the problems of pollutant accumulation, too fast scaling and filter material overpressure damage are solved, the filter element replacement period is prolonged, and the maintenance cost is reduced.

The embodiment of the application relates to the technical field of wireless charging, and discloses a cover plate and communication equipment, the cover plate comprises a cover plate body, a wireless charging module and a covering film, the cover plate body is provided with an accommodating window, the wireless charging module is embedded in the accommodating window, the wireless charging module comprises a charging coil and a shielding layer, the shielding layer is arranged below the charging coil and is stacked with the charging coil, the shielding layer is tightly embedded with the inner wall of the accommodating window, and the covering film is arranged above the accommodating window and covers the wireless charging module. In the above manner, the distance between the charging coil in the wireless charging module and an external transmitting end can be greatly shortened, and the electromagnetic coupling strength of the system is effectively improved.

The invention relates to the technical field of direct-current power transmission system simulation, and discloses an online simulation method of an LCC direct-current power transmission electromechanical electromagnetic hybrid system. The method comprises the following steps: constructing a system diagram structure model, and respectively representing electrical components and electromagnetic coupling relations thereof by nodes and edges; mapping the real-time operation data into a space-time diagram data sequence; performing multi-resolution wavelet decomposition on the sequence, and extracting a low-frequency contour and a high-frequency detail electromagnetic characteristic mode; dynamically calculating a node weight according to a feature mode by using a graph attention network, and generating enhanced electromagnetic field distribution fusing local and global features; and finally, a simulation signal is output by solving an electromagnetic field equation. According to the method, through multi-scale feature separation and dynamic coupling relation modeling, finer and more adaptive simulation of the broadband electromagnetic transient process of the system is realized, and the simulation precision and the depicting capability of complex working conditions are improved.

This invention discloses a visible transparent, ultra-wideband microwave absorption structure, comprising, from top to bottom, a visible transparent spatial shielding layer, an impedance-gradient absorption layer, and a total reflection bottom layer. The spatial shielding layer is highly transparent to the microwave band. The impedance-gradient absorption layer is composed of multiple layers of low-dielectric-constant transparent dielectric substrates and an array of transparent conductive patterns disposed thereon, stacked alternately. The total reflection bottom layer is totally reflective to the microwave band. By precisely designing the gradient period and equivalent resistance of the multilayer transparent conductive pattern array, and utilizing the electromagnetic coupling and multi-point resonance mechanism of the upper and lower layers, this invention achieves ultra-wideband microwave strong absorption of more than 90% in the 1-40 GHz frequency band at the subwavelength scale, breaking through the bandwidth limitation bottleneck of traditional microwave absorbing structures; and it also possesses excellent visible light transparency characteristics.

The application provides a wireless power transmission system based on active adjustment of a coupling coefficient, comprising two corresponding electromagnetic change modules, one of which is electrically connected with an input power supply, and the other is electrically connected with a load device; the electromagnetic change modules are correspondingly provided with feedback adjustment modules, which are used for adjusting equivalent electrical parameters of the two electromagnetic change modules and a coupling degree between the two electromagnetic change modules. The application has the beneficial effects that, based on the influence of high magnetic permeability material on equivalent electrical parameters of a coil, the relative positions of an electromagnetic change coil and an electromagnetic shielding plate are used to realize active adjustment of the coupling degree of an electromagnetic coupling mechanism, so that the influence of external factors on the coupling degree of the electromagnetic coupling mechanism is overcome or the requirements of the load on power transmission are met.

This application relates to the field of automotive radar technology, disclosing an antenna array and an automotive radar. The antenna array includes a substrate, an electromagnetic isolation structure, and a feeding assembly. The substrate is provided with a transmitting part and a receiving part. The transmitting part includes multiple transmitting radiating elements arranged to form a transmitting radiating array. The receiving part includes multiple receiving radiating elements arranged to form a receiving radiating array. The electromagnetic isolation structure is disposed between adjacent radiating elements to suppress electromagnetic coupling between the radiating elements. The feeding assembly is disposed on the substrate and is connected to both the transmitting radiating array and the receiving radiating array. Through the above method, this application embodiment can block the coupling path of electromagnetic waves, thereby improving the overall isolation of the array.

A feeding structure comprises: a dielectric plate for vehicle window having a first surface and a second surface opposite to the first surface; a feeding unit positioned on the first surface side of the dielectric plate; and a receiving unit positioned on the second surface side of the dielectric plate, wherein the dielectric plate includes a first dielectric region between the feeding unit and the receiving unit, and a second dielectric region adjacent to the first dielectric region in a plan view, and the second dielectric region has a relative permittivity lower than that of the first dielectric region when the feeding unit and the receiving unit are electromagnetically coupled to each other.

The invention discloses a BOPP (Biaxially-oriented Polypropylene) rolling driving safety linkage control method, which relates to the technical field of industrial automation control and comprises the following steps: establishing an electromagnetic disturbance distribution diagram of a driving and rolling signal transmission path, extracting electromagnetic coupling strength distribution on the basis of a current pulse space diffusion track generated by a driving device and a rolling device in a start-stop stage, and calculating a driving speed of the driving and rolling signal transmission path; and dividing a strong coupling region and a weak coupling region according to the coupling strength to form a continuous electromagnetic characteristic band. The delay absorption layer and the reverse phase shift guide chain are arranged in a signal path, so that layered energy absorption and reverse phase counteracting are realized, electromagnetic pulse propagation is weakened, and false triggering is prevented; and meanwhile, a low-amplitude periodic slip signal is injected into the signal input end, so that the channel frequency generates micro-amplitude wandering, a dynamic self-adaptive anti-interference mechanism is formed, and stable and reliable signal transmission is ensured.