33 results about "Permittivity" patented technology

A surface acoustic wave resonator comprising a multilayer piezoelectric substrate including a layer of piezoelectric material, and interdigital transducer (IDT) electrodes disposed on the layer of piezoelectric material, the IDT electrodes including a first and second bus bars, a first plurality of electrode fingers extending from the first bus bar toward the second bus bar, and a second plurality of electrode fingers extending from the second bus bar toward the first bus bar and interleaved with the first plurality of electrode fingers in a central region of the resonator, gap regions defined between tips of the first plurality of electrode fingers and the second bus bar and between tips of the second plurality of electrode fingers and the first bus bar, regions of piezoelectric material forming the layer of piezoelectric material in the gap regions having a lesser permittivity and / or piezoelectricity than the piezoelectric material in the central regions.

Electric fields are used to determine electrical characteristics of an object, such as permittivity. A dielectric substrate (101, figure 1) has first and second surfaces, with a first set 116, 117, 11

A semiconductor chip device includes a substrate with a first dielectric material of a first permittivity value. A power input line and ground line are positioned in the substrate and arranged to form a decoupling capacitor. A region of the substrate in between the power input line and the ground line is doped with a second dielectric material of a second permittivity value that is higher than the first permittivity value. The region doped with the second dielectric material lacks a signal body. By incorporating a region with higher permittivity, in what is generally unused space for power delivery, the region becomes a decoupling capacitor for nearby power delivery elements. By adding decoupling capacitance to the previously unused space, noise in a circuit is more easily controlled and the chip device becomes more reliable.

The application discloses a physical neural network-based electrical property tomography method, which spatially obtains permittivity and conductivity of all points through four steps.The application does not need to simplify the core equation of MR-EPT to solve, and does not need to use a numerical method to solve by discretizing the derivative of the dielectric property in space, thereby avoiding the discretization error, so that the application has higher precision in obtaining the permittivity and the conductivity.The physical neural network-based electrical property tomography method uses a neural network to construct a mapping relationship between a transmit field and its spatial derivative and electrical properties, so that the precision of the obtained result is higher.

The present disclosure provides a protective enclosure for electronic systems integrating two key components: a preconfigurable polymer matrix and a tunable metamaterial. The polymer matrix forms a lightweight, structurally robust foundation with excellent mechanical properties and design flexibility, configurable for specific application requirements. Integrated within this matrix is a highly adaptable metamaterial system, precisely tunable to interact with electromagnetic energy in customized ways. By adjusting its permittivity and permeability, the metamaterial can selectively repel or absorb specific frequencies of electromagnetic radiation, allowing targeted shielding against harmful interference while permitting desired communication signals to pass through. This integration overcomes limitations of traditional electromagnetic shielding approaches, offering enhanced design flexibility and customization for various electronic applications. The use of carbon nanoparticles enables fine-grained control over the metamaterial's electromagnetic properties, creating protective enclosures that effectively manage electromagnetic energy while remaining lightweight and mechanically robust.

The disclosure relates to a sensor for a quantity of a medium, such as the permittivity of the medium. This sensor comprises at least one sensitive element capable of: injecting waves, the injection being controlled by the application of an input signal, and collecting received waves, perturbed by physical properties of the medium related to said quantity, to form an output signal having, with respect to the input signal, a modulation from which a measurand indicative of said quantity of the medium is determined. The sensor also comprises a control unit capable of generating said input signal with a wave frequency to be injected corresponding to a chosen excitation frequency, and a processing unit applying a demodulation of the output signal to determine the corresponding measurand. In particular, the processing unit is configured to cooperate with the control unit to generate the input signal.The excitation frequency is adjusted according to the input and output signals using a feedback loop within the processing unit. This maintains a linear response of the output signal over a range of measurands by continuously adjusting the excitation frequency. The feedback loop is thus configured to ensure constant sensor sensitivity over this range. (See Figure 4 for an abstract diagram.)

Electric fields are used to determine electrical characteristics of an object, such as permittivity, by energising selected electrodes and monitoring remaining electrodes. A dielectric substrate (101,

A new LC medium exhibits a ferroelectric-nematic phase at ambient temperature. It comprises at least one or more compounds selected from each of the groups of formula IA, IB and IC-1 / IC-2 / IC-3, wherein the variable groups have the meanings indicated in the text and claims. The mixture can be used in electro-optics, electronics, electromechanics and other applications for materials with very high dielectric permittivity and other energy saving applications.

The invention relates to the technical field of harmonic suppression, and discloses a load harmonic suppression method and system for a remote micro-grid, and the method comprises the steps: analyzing the stator flux linkage data of a motor in the remote micro-grid to determine a filtering parameter and SVG reactive data, analyzing the SVG reactive data to obtain a DC side capacitor, and carrying out the electromagnetic torque simulation. Generating stator flux linkage response data and determining a response speed; determining permittivity parameters according to the direct-current side capacitance, and calculating a damping coefficient in combination with the response speed and a preset model; carrying out harmonic suppression processing on the voltage transient data based on the damping coefficient, and if the suppression effect does not reach the standard, decomposing the voltage transient data to optimize SVG impedance matching parameters; extracting an angle deviation in the voltage transient data to determine the switching frequency of the converter valve, further constructing an electromagnetic torque ripple response model to optimize SVG reactive data, and generating a load harmonic suppression strategy in combination with optimized filtering parameters and the switching frequency; and the voltage stability and the electric energy quality of the independent micro-grid in the remote area are improved.

The present disclosure provides a protective enclosure for electronic systems integrating two key components: a preconfigurable polymer matrix and a tunable metamaterial. The polymer matrix forms a lightweight, structurally robust foundation with excellent mechanical properties and design flexibility, configurable for specific application requirements. Integrated within this matrix is a highly adaptable metamaterial system, precisely tunable to interact with electromagnetic energy in customized ways. By adjusting its permittivity and permeability, the metamaterial can selectively repel or absorb specific frequencies of electromagnetic radiation, allowing targeted shielding against harmful interference while permitting desired communication signals to pass through. This integration overcomes limitations of traditional electromagnetic shielding approaches, offering enhanced design flexibility and customization for various electronic applications. The use of carbon nanoparticles enables fine-grained control over the metamaterial's electromagnetic properties, creating protective enclosures that effectively manage electromagnetic energy while remaining lightweight and mechanically robust.

There remains a need for a ferrite material with low magnetic loss, high permeability, and low permittivity and dielectric loss in the gigahertz range, and a method of making the ferrite material.SOLUTION: The polycrystalline ferrite composition is represented by the M5Me2Ti3Fe12O31 formula, wherein M is Ba2 +, Sr2 +, or a combination thereof; Me is Mg2 +, Zn2 +, Cu2 +, Co2 +, or a combination thereof; and has an average grain size of 1 micrometer to 100 micrometers. The composite comprises a polymer matrix and the polycrystalline ferrite composition described above. Methods of making the polycrystalline ferrite compositions and composites thereof are also disclosed.SELECTED DRAWING: None

The invention is directed a fixation assembly for a medical lead providing better energy dissipation during MRI conditions. The fixation assembly comprises an elongated body extending between a distal end and a proximal end, wherein the fixation assembly further comprises at least one electrode and / or at least one radiopaque marker, wherein the elongated body comprises at least one energy dissipating element located in close proximity to the at least one radiopaque marker and / or the at least one electrode, wherein the material of the at least one energy dissipating element exhibits a permittivity that is equal to or greater than 4 F / m.

The present invention addresses the problem of providing a multilayer laminated film that transmits visible light in the front direction, is transparent, and has a near-infrared reflection function and a function of reflecting P-wave visible light in an inclined direction, and the present invention is a multilayer laminated film in which three or more types of resin layers are regularly arranged, when the permittivity of each layer at an energy loss of 2.5 eV measured by EELS is defined as a permittivity Xi (i = 1, 2, 3,...), and the layer A, the layer B, and the layer C are defined in this order from the layer having a large permittivity Xi, all of the following conditions (1)-(3) are satisfied. (1) The film has a repeating unit structure in which repeating units are laminated, the repeating units being arranged in the order of A layer / B layer / C layer / B layer. And (2) the repeating units having a total layer thickness of 250-630 nm in the repeating units account for 80-100% of the total repeating units. And (3) the A layer is a crystalline thermoplastic resin layer, and the B layer and the C layer are amorphous thermoplastic resin layers.

The application aims to provide a complex permittivity inversion correction method of a free space focusing system, and belongs to the technical field of microwave and millimeter wave material complex permittivity testing. The method decomposes a focusing beam into many uniform plane waves, and obtains a correction formula through superposition of reflection fields of each uniform plane wave component, thereby correcting model errors caused by deviation of the focusing beam radiated by an actual focusing system from the uniform plane wave, and improving the precision of the complex permittivity inversion model of the focusing beam system.

The application discloses a train interference analysis method and device and a storage medium, and relates to the field of train interference analysis. In the scheme, the complex permittivity under different frequencies is measured in advance to obtain a corresponding relationship between the complex permittivity and the frequency, so that when electromagnetic analysis is performed on the whole train, the target complex permittivity corresponding to the current simulation frequency in the corresponding relationship is used instead of the complex permittivity provided in the existing literature, thereby avoiding the problem that the cited complex permittivity cannot be verified. Furthermore, the accuracy of electromagnetic testing on the whole train is higher by using the pre-measured complex permittivity. In addition, when electromagnetic analysis is performed on the whole train in the application, an electromagnetic simulation model is established, which is an entity simulation model based on the vehicle body structure. Compared with the simplified electromagnetic model commonly used in the prior art, the simulation result obtained is closer to the actual application scenario, so that the reference significance of the simulation result is greater and the value is higher.

The invention relates to an antenna element (1) for an antenna array having a dielectric first antenna bar (3) and a dielectric second antenna bar (4), wherein a converter section (5) is formed in the antenna element (1), in which the first antenna bar (3) tapers in cross section in a longitudinal direction and the second antenna bar (4) is formed at a distance from the first antenna bar (3), forming a gap (6), and increases in cross section, and the gap (6) extending in the longitudinal direction has a gap medium with a lower permittivity than a permittivity of the first antenna bar (3) and of the second antenna bar (4), such that a mode of a signal coupled into the antenna element (1) is guided in the gap (6). In this way, a low-loss wideband antenna element is provided in which a propagation time of a signal is easily adjustable. The antenna element according to the invention can also be produced in a compact and cost-efficient manner and is easily integratable.

Provided herein are electrohydrodynamic devices, systems, and methods configured to isolate of one or more particles of varying size and dielectric properties.

A system for analysis of a porous formation is disclosed. Such a system can provide electrical signals for one or more of the porous formation or a representation of the porous formation; can determine, using the electrical signals, permittivity and conductivity measures for the porous formation or the representation of the porous formation; and can model the permittivity and conductivity measures to generate a first estimation model associated with pore features for the porous formation, so that a downhole rock formation can be evaluated for pore connectivity, permeability, and Archie's texture parameters using estimation models.

A method includes introducing a first material component having a first permittivity and a second material component having a second permittivity to a mixing unit. The first and second material components are advanced through the mixing unit at a mixing ratio to form a material component mixture that is dispensed from the mixing unit. A third permittivity of the material component mixture, which is related to the first permittivity, the second permittivity, and the mixing ratio, is determined. The third permittivity is compared to a predetermined permittivity, which is related to the first permittivity, the second permittivity, and a predetermined mixing ratio. If the third permittivity differs from the predetermined permittivity by a threshold limit or more than the threshold limit, a corrective response is generated.

The application discloses a kind of powder material complex permittivity test system and its calibration method: including vector network analyzer, first wave same converter, second wave same converter, first waveguide, second waveguide, waveguide fixture, gasket, waveguide fixture is made of a group of different length waveguide pieces;When testing, two gaskets are respectively embedded in the two ports of the opposite sides of waveguide fixture, and the powder material to be measured is sealed in waveguide fixture;First waveguide and second waveguide are connected with straight-through calibration piece, and Thru calibration is carried out;First waveguide or second waveguide is connected with reflection calibration piece, and gasket and metal sheet are embedded in reflection calibration piece, and Reflect calibration is carried out;First waveguide and second waveguide are connected with transmission line calibration piece, and Line calibration is carried out.The application is equipped with waveguide fixture of different lengths simultaneously, ensures the measurement accuracy of powder material complex permittivity, removes the influence of gasket during calibration test, and the test process is simple and accurate.

The application discloses a method and device for measuring complex permittivity of wave-transparent material based on radiometer, and belongs to the field of passive microwave / millimeter wave remote sensing and detection technology. The method comprises the following steps: preparing N (N>=3) material samples with different thicknesses, and recording the thicknesses as d [d1, d2, d3…, d N ]; the thickness of each sample should be smaller than the skin depth of the material to ensure that electromagnetic waves can effectively penetrate the sample; measuring linear polarization transmittance of the material samples with all the thicknesses at an incident angle θ, and recording the transmittance as γ [γ1, γ2, γ3…, γ N ]; using a fitting algorithm to fit the output loss index factor Q (ε r , θ) and the Fresnel reflectivity T p (ε r , θ) according to the calculation formula of the transmittance of the wave-transparent material; and calculating the complex permittivity ε r using the Q (ε p , θ) and the T r (ε r ). The application can obtain a unique solution of the complex permittivity of the wave-transparent material, and realize accurate measurement of the complex permittivity of the wave-transparent material.

A surface plasmon resonance spectrometer includes a substrate, a first dielectric spacer, a detector, a second dielectric spacer, and a plurality of metal scattering structures. The substrate includes a region having a permittivity gradient. The first dielectric spacer is positioned on the substrate at a location corresponding to the region having the permittivity gradient. The detector is positioned over the region having the permittivity gradient with the first dielectric spacer therebetween. The second dielectric spacer is positioned on the detector opposite the first dielectric spacer. The plurality of metal scattering structures are positioned on the second dielectric spacer opposite the detector.

The application relates to a metal organic framework (MOFs) derived carbon coated FeSi-based composite magnetic wave-absorbing material and a preparation method thereof. The surface oxidized flaky FeSi-based magnetic wave-absorbing powder is combined with MOFs derived carbon as a core to improve interface polarization, dipole polarization, increase complex permittivity, strengthen multi-level structure interface scattering, and optimize impedance matching of the composite material. When the content of the prepared material is 10% and the coating thickness is 1.5 mm, the reflectivity is optimized from -2 dB to -36.5 dB. The material prepared by the application can realize effective absorption of electromagnetic waves at low thickness, has good chemical stability, and has a simple preparation method. After the surface of the flaky FeSi-based magnetic wave-absorbing powder is oxidized, the FeSi-based core can be prevented from being eroded in the MOFs combination process, and the existence of the oxidation layer improves the stability and corrosion resistance of the material.

A radar fill level measuring device for detecting the level of a medium with low permittivity located in a container is shown and described, with a feed and receiving element arranged outside the container for generating and receiving electromagnetic radiation, with a measuring window in the wall of the container that is permeable to electromagnetic radiation, with a waveguide arranged in the container and extending over a level measurement range. The waveguide can be flooded by the medium. The feed and receiving element, the measuring window and the waveguide form a measuring path over which, during measuring operation, electromagnetic radiation generated by the feed and receiving element propagates through the measuring window and through the waveguide during measurement operation. Electromagnetic radiation reflected from a medium surface in the waveguide is guided back through the waveguide and through the measuring window to the feed and receiving element.

A pumping system includes a pumping chamber with a fluid sensor that has a cylindrical shaft extending into the priming chamber. The sensor has a sensing dome at one end of the cylindrical shaft extending into the priming chamber, the dome having a vertical base with a diameter smaller than the diameter of the cylindrical shaft. The sensor indicates to a controller whether fluid is present based on an algorithm with settings for electromagnetic field damping, electric field conductance, and / or magnetic field permittivity, using configurations that correlate with the fluid environment. The controller controls the operation of the pump and priming system based on the sensor signal.

Embodiments provide a method for determining an alternating magnetic field (AMF) transmitter design that produces a magnetic field that achieves a more uniform surface current or heating of an implant. Embodiments may utilize the method to be applicable to different geometries of implants and AMF transmitters. Embodiments produce a non-uniform magnetic field that in turn produces a more uniform current density / distribution on the implant surface. This leads to uniform heating and consistent biofilm reduction, while minimizing damage to adjacent tissues. Also, the differences in electrical properties such as conductivity, permittivity, and permeability of the implant components can be factored into the design process to achieve a uniform current density / distribution across components. An ultimate benefit derived from embodiments described herein is consistent biofilm reduction, inactivation, eradication, destruction, and / or removal and improved safety arising from heat conduction into surrounding tissues.

Embodiments described herein may be related to optical devices and apparatuses directed to forming waveguides and optical phase modulators that enable high baud rate modulation. In one embodiment, an optical phase modulator includes: photonic optical waveguides having their cladding regions and electrical contacts formed by material with its absolute permittivity near zero (ENZ), and their waveguide core region formed by electro-optical (EO) material or silicon PN junction whose optical refractive index changes with strength of externally applied electrical field. The ENZ material described herein further possesses properties of both optical transparency at operating wavelength and electrical conductivity. The ENZ claddings and electrodes may further have dimensions to enable high externally applied electrical field within waveguide core. The EO material described herein includes but not limited to organic polymers, LiNbO3, liquid crystals. Other embodiments are described and claimed.

The stator comprises: a stator core having a plurality of radially extending toothed sections; resin insulators attached to the stator core; and coil winding sections, each wound onto a corresponding toothed section of the stator core over a corresponding insulator. Furthermore, an insulating layer having a lower permittivity than the insulators is provided between the stator core and each coil winding section.

The present application relates to a kind of lightweight microwave absorbing material based on high aspect ratio conductive fiber and its preparation method.The present application utilizes the unique dispersion characteristics (permittivity changes with frequency) of high aspect ratio conductive fiber, which is mixed with resin to make wave-absorbing layer, and is applied to Jaumann wave-absorbing structure, achieving significant improvement of overall wave-absorbing performance in 2-18GHz.The material is composed of wave-absorbing layer and dielectric layer (porous foam), and the wave-absorbing frequency band is closely related to the impedance characteristics, order and thickness of each layer.The aspect ratio of the conductive fiber in the present application is greater than or equal to 1000, and the electrical conductivity is greater than or equal to 10 4 S / m; the areal density of the microwave absorbing material in the present application is less than or equal to 0.3kg / m 2 , the thickness is less than or equal to 25mm, the microwave reflectivity is less than or equal to -10dB in 2GHz-4GHz, and less than or equal to -25dB in 4GHz-18GHz, which is a lightweight ultra-wideband wave-absorbing material.

The application provides a broadband non-via reusable permittivity measuring device and method, which comprises a metal floor, a metal gasket, a to-be-measured substrate, a periodic electromagnetic band gap structure and a standard waveguide structure; the standard waveguide structure of the test structure is sequentially provided with a standard flange and a standard waveguide from bottom to top; the periodic electromagnetic band gap structure comprises two rectangular coupling holes and periodic rectangular metal columns; feeding of the application is coupled through the standard waveguide through the coupling holes; the resonant cavity formed by the gap waveguide is used for testing the permittivity of a film or sheet-shaped medium represented by a packaging material; compared with a traditional testing method, the medium substrate of the method is simple to process, does not need to be punched and has higher testing precision.