241 results about "Wide band" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

A method for forming semiconductor devices includes: attaching a glass structure to a wide band-gap semiconductor wafer having a plurality of semiconductor devices; forming at least one pad structure electrically connected to at least one doping region of a semiconductor substrate of the wide band-gap semiconductor wafer, by forming electrically conductive material within at least one opening extending through the glass structure; and reducing a thickness of the wide band-gap semiconductor wafer after attaching the glass structure. Additional methods for forming semiconductor devices are described.

This invention relates to a high numerical aperture, large field-of-view total internal reflection microscope objective in the ultraviolet wide band. Along the optical axis from image to object, it comprises: a first objective consisting of a first and a second reflecting mirror arranged sequentially along the optical axis OA from image to object, used to receive parallel light and form an intermediate image plane; and a second objective consisting of a third and a fourth reflecting mirror arranged sequentially along the optical axis OA from image to object, used to image the intermediate image plane onto the object plane. The first reflecting mirror is a convex mirror with negative optical power; the second reflecting mirror is a concave mirror with positive optical power; the third reflecting mirror is a concave mirror with positive optical power; and the fourth reflecting mirror is a concave mirror with positive optical power. This invention employs a four-mirror total internal reflection structure, and by optimizing the focal length and aperture ratios of each reflecting mirror, it achieves a balance between high numerical aperture and a large field of view, overcoming the limitations of traditional total internal reflection objectives where numerical aperture and field of view are mutually constrained.

The embodiment of the application provides a kind of based on integrating sphere light source's photosensitive diode multispectral calibration device and method, for by dark current measurement, photocurrent correction and wavelength response fitting, photosensitive diode array is carried out wide band multispectral calibration.The device of the application includes integrating sphere device, multi-band adjustable light source module, the photosensitive diode array to be calibrated and control and analysis unit;The inner wall of integrating sphere device is high reflectivity diffuse reflection material;Integrating sphere device further includes trap detector, and trap detector is used for real-time monitoring the reflection loss of the inner wall of integrating sphere device;Trap detector is connected with control and analysis unit communication;Multi-band adjustable light source module is accessed integrating sphere device;The photosensitive diode array to be calibrated is composed of multiple photosensitive diodes;Control and analysis unit and multi-band adjustable light source module, the photosensitive diode array to be calibrated establish communication connection.

The application discloses an anti-interference data communication cable and a preparation method thereof, and belongs to the technical field of communication cables. The cable core is composed of a conductor and a gradient insulation layer coated on the outer side. The conductor is composed of a plurality of super-smooth silver-plated copper alloy filaments which are concentrically stranded. The gradient insulation layer is composed of an inner layer of nano-modified foamed insulation layer and an outer layer of crosslinked solid insulation layer. Two cable cores form a differential signal line pair, and a plurality of differential signal line pairs are coated in a shielding layer and a protective layer. The shielding layer and the protective layer sequentially comprise an inner shielding layer, a functional buffer layer, an outer shielding layer and an outer sheath layer from the inside to the outside. Compared with the prior art, the application realizes a shielding effectiveness of more than 80 dB in a wide frequency band through conductor surface treatment, gradient insulation design and a multi-layer cooperative shielding system, simultaneously significantly reduces high-frequency signal transmission loss, and improves the signal integrity and long-term reliability of the cable in a high-speed, high-density and strong-interference environment.

The application discloses a kind of wideband signal-oriented distributed movable antenna layout optimization method, comprising: based on swarm intelligence algorithm, antenna layout scheme is iteratively optimized until reaching iteration stop condition, the best fitness of population corresponding antenna layout scheme is regarded as the optimal scheme of antenna layout output;Wherein, the fitness of population is determined according to the wideband cumulative Cramer-Rao bound of its corresponding antenna layout scheme.The present application can directly construct the bottom mapping relationship between continuous position variable and wideband signal direction finding error lower limit by introducing wideband Cramer-Rao bound as fitness function.Because the index itself represents the theoretical minimum direction finding error of antenna layout, it can accurately quantify the spatial spectrum coupling effect of full frequency band;As fitness function, it can make the optimization directly towards the most essential optimization goal, ensure that the output physical array theoretically approximates the wideband direction finding physical limit under this degree of freedom.

This invention relates to a high-fidelity torque measurement device and method based on resonance suppression and measurement optimization, belonging to the field of high-precision detection technology for spacecraft, and includes a closed-loop measurement scheme in both hardware and software. The device comprises a high-precision triaxial air-bearing stage, a high-frequency torque measurement sensor system, a fiber optic inertial measurement unit, an active control actuator system, and a host computer control and data processing system. The method sequentially achieves precise locking of inertial parameters with variable weights for measurement innovations through pre-test calibration, completes wideband resonance active suppression based on inertial linkage during testing, and achieves mode-free signal purification through variational mode decomposition using multidimensional measurement optimization after testing. This invention overcomes the physical limits of traditional mechanical structures in broadening the measurement bandwidth, eliminates dynamic calibration model mismatch errors, and achieves high-fidelity and robust measurement of wideband dynamic torque, suitable for precise detection of high-frequency micro-vibration dynamic torque in spacecraft actuators.

The utility model discloses an antenna, it includes: metal base plate, first slit, it is set up on metal base plate, and two opposite boundaries of first slit respectively are provided with first feed point and second feed point, and first feed point and second feed point constitute feed port, second slit, it is set up on metal base plate, and with first slit intercommunication, first slit is used at least for producing support first frequency band's first resonant mode, and second slit is used at least for producing support second frequency band's second resonant mode, first frequency band is higher than second frequency band, and / or, first frequency band is ultra wide band frequency band. Accordingly, the utility model discloses an antenna assembly, it includes: dielectric substrate and at least one utility model above-mentioned antenna, and each antenna is located on dielectric substrate. Meanwhile, the utility model discloses a vehicle, it includes the antenna assembly of utility model above-mentioned, and dielectric substrate is glass base plate.

The application discloses a preparation method of a wide-bandgap perovskite photoactive layer, and comprises the following steps: S1, lead iodide powder, cesium iodide powder and ytterbium bromide powder are proportioned according to a proportioning molar ratio, and an inorganic target material is prepared by using a hot-press sintering process; S2, formamidinium hydriodide powder and methylammonium bromide powder are proportioned according to a proportioning molar ratio, and an organic target material is prepared by using a normal-temperature preparation process; S3, a pretreated substrate is placed on a magnetron sputtering sample table, the target materials prepared in steps S1 and S2 are respectively installed on corresponding radio frequency sputtering targets, and the background of a magnetron sputtering system is vacuumized; S4, high-purity argon gas is used as a sputtering gas, and a wide-bandgap perovskite thin film is prepared by using a magnetron co-sputtering method; the sputtering power of the inorganic target material prepared in step S1 is controlled, the sputtering power of the organic target material prepared in step S2 is controlled, and the thickness of the thin film is controlled, so that the high-quality thin film is prepared by using the differential target material preparation process.

A mobility service providing method and apparatus are provided. The method includes: moving, by a vehicle, to a customer when the customer requests the vehicle to provide a mobility service and forming, by one or more anchors mounted on the vehicle, an Ultra-Wide Band (UWB) link with an information technology (IT) device carried by the customer when a determination is made that a distance between the vehicle and the customer is within a predetermined distance; performing a smart anchor positioning (SAP) algorithm to estimate a position of the IT device; performing position-based security authentication with the customer; and arriving, by the vehicle, at the customer, wherein the one or more anchors and the IT device transmit or receive UWB pulse waves.

This invention discloses a multilayer stripline 90-degree bridge, belonging to the field of microwave passive device technology. The bridge includes a first metal base and a second metal base arranged opposite each other and each having a groove; a multilayer dielectric substrate sealed and sandwiched between the two bases, completely filling the grooves; and a first stripline and a second stripline disposed on different layers within the multilayer dielectric substrate. The first and second striplines are parallel to each other and DC isolated from each other, with their central coupling units corresponding to the groove positions in their vertical projection. The bridge also includes an input port, a through output port, a coupled output port, and an isolation port. This invention, through the sandwich sealing structure of the metal base grooves and the multilayer dielectric substrate, enhances the electromagnetic coupling between the striplines, allowing for the use of wider and thicker coupling lines, thereby achieving low insertion loss, high power capacity, and good amplitude and phase balance over a wide frequency band, and exhibiting excellent low-temperature environmental adaptability.

The embodiment of the application provides a magneto-electric monopole antenna unit, a magneto-electric monopole antenna array, an antenna and equipment, and belongs to the technical field of wireless communication. The antenna unit comprises a first dielectric substrate, a monopole radiator, a microstrip feed line, a metal reflector plate, a short-circuit metal column and two ground patches. It generates an electric monopole mode through the monopole radiator excitation, and generates a magnetic monopole mode through the short-circuit metal column, the ground patch and the reflector plate, and the two modes work together to realize wideband radiation and widen the beam width. The coupled currents on the two ground patches produce two pairs of opposite electric field components in the far field and offset each other, thereby realizing low cross polarization. The array composed of multiple units is loaded with a metasurface above, which significantly improves the port isolation by introducing a reflection path opposite in phase to the original coupling path. The application solves the technical problem that it is difficult to simultaneously realize wide-angle scanning, low cross polarization and high isolation in a wide frequency band.

This invention discloses a sound velocity profile assimilation and inversion method and system based on dual physical data driving. The method includes: performing adaptive observation and sparse characterization of the sound propagation path to obtain the sparse characterization results; performing long-term noise cross-correlation calculation and passive time delay self-calibration to obtain the virtual sound source arrival time series after absolute time delay reference correction; performing constraint verification through a physical-data dual-driven, dual-stream coupled generative inversion network; acquiring a broadband electromagnetic response time series and performing cross-medium electromagnetic-acoustic joint inversion constraints to obtain a strongly constrained calibrated full-depth sound velocity profile; and performing ensemble Kalman filtering assimilation and uncertainty propagation based on POD order reduction. This invention can quantify the uncertainty of the inversion results. As a sound velocity profile assimilation and inversion method and system based on dual physical data driving, this invention can be widely applied in the field of underwater acoustic engineering technology.

This invention relates to the field of unmanned aerial vehicle (UAV) navigation technology, specifically to an autonomous navigation control method for UAVs in strong electromagnetic environments. The method includes: acquiring raw electromagnetic interference signals within the flight airspace using a multi-band electromagnetic spectrum sensor array mounted on the UAV, containing broadband power spectral density distribution, pulse interference timestamp sequences, and phase jitter characteristics at specific frequencies; generating an interference source distribution heatmap using an electromagnetic environment feature analyzer, and constructing an electromagnetic situational awareness constraint field by fusing inertial navigation attitude data; dynamically reconstructing the global flight path topology based on this constraint field, generating a set of local flight path segments that avoid high-interference sectors and marking their electromagnetic safety margin levels; and spatially registering the ground feature point image sequence acquired by an optically assisted positioning module with the local flight path segment set to generate composite navigation guidance commands. This method can effectively adapt to strong electromagnetic environments, improving the stability and accuracy of UAV autonomous navigation.

The present application relates to the technical field of wide band gap semiconductor devices, and particularly relates to a Ga2O3 power device heat dissipation optimization method based on a hetero-substrate structure, which comprises the following steps: combining a first principle to construct an interface atomic model, adopting the first principle to screen a high-thermal-conductivity substrate material, constructing a hetero-interface model to analyze key physical parameters, calculating an interface thermal resistance based on a machine learning potential function and a molecular dynamics method, and combining finite element thermal simulation to carry out macro-scale thermal analysis and structure optimization. The present application covers the whole process from material screening to interface optimization and then to device-level thermal simulation, systematically improves the thermal management performance of the Ga2O3 power device, and simultaneously improves the efficiency and reduces the trial and error cost, thereby providing differentiated strategies for adapting to various complex application scenarios.

This invention discloses a circularly polarized selective wireless energy harvesting rectifier, comprising a metasurface module, a power combining module, and a rectification module. The metasurface module includes multiple absorbing units arranged in a periodic array. Each absorbing unit includes a resonant structure on the front side of a dielectric substrate and a metallized via penetrating the substrate. The resonant structure is a conductive ring with two offset openings, one of which contains a capacitive element. The power combining module includes a power combining network disposed on the back side of the dielectric layer of the power combining network. The input terminal of the rectification module is connected to the output terminal of the power combining module. This rectifier simultaneously solves the two core problems of polarization mismatch and bandwidth limitation. It integrates polarization selection, wideband energy harvesting, and high-efficiency rectification functions. Its core function is to efficiently selectively absorb and convert right-hand circularly polarized waves while generating strong reflection of left-hand circularly polarized waves to suppress interference.

An ultra wide band (UWB) antenna includes: a planar portion arranged above and parallel to a ground plane; a ground connecting portion configured to electrically connect the UWB antenna to the ground plane; a tapered portion configured to be electrically connected to a feed, the tapered portion extending around at least 40 percent of a periphery of the planar portion and extending from the planar portion toward the ground plane, where a height of the tapered portion decreases around the periphery of the planar portion moving away from the feed, and where a lower edge of the tapered portion is spaced from the ground plane by a gap; and a circuit board including one or more circuit components and configured to electrically connect: the feed to the tapered portion; and the one or more circuit components to the ground plane.

The application provides an E-FSR unit with an absorption and transmission mode controlled by an HPM and a direct current bias, comprising a plurality of periodically arranged E-FSR units, each unit being a five-layer cascade structure, and from top to bottom, the five-layer cascade structure is sequentially a first loss layer, a first air layer, a second loss layer, a second air layer and a frequency selection layer; the first loss layer, the second loss layer and the frequency selection layer each comprise a dielectric substrate, a metal pattern printed on the upper and lower sides of the dielectric substrate and a metal connecting column penetrating through the dielectric substrate; the frequency selection layer and the first loss layer and the second loss layer each are provided with a diode, the absorption and transmission mode is switched by applying a direct current bias voltage to the diode or driving the diode by using high-power microwave incidence, so as to meet the antenna mute stealth requirement, and the absorption and transmission mode is adaptively switched to an absorption band when high-power microwave is incident, so as to realize a protection function. The application solves the in-band strong scattering problem when the antenna is muted, has the advantages of dual-polarization characteristics, wide-band absorption and low insertion loss and the like.

The application relates to a series double-stage shock absorber for oil drilling, which comprises a shell, a fluid damping module, an inertial vibration absorption module, a pressure compensator system and a heat dissipation and sealing system arranged in the shell, the fluid damping module and the inertial vibration absorption module are axially connected in series to form a series double-stage shock absorbing structure, the fluid damping module is arranged in a fluid damping chamber at the lower part of the shell, the inertial vibration absorption module is arranged in an inertial vibration absorption chamber at the upper part of the shell, and the pressure compensator system is arranged between the fluid damping module and the inertial vibration absorption module; the fluid damping module comprises rectangular damping discs, a transition flow channel and damping liquid, the rectangular damping discs are uniformly arranged outside the transition flow channel, and the rectangular damping discs are provided with damping holes and damping rib plates; heat dissipation fins are uniformly arranged at the lower part of the shell. The series double-stage shock absorbing structure is adopted, large energy low-frequency impact is consumed through the fluid damping chamber, high-frequency vibration is filtered through the inertial vibration absorption chamber, and wide-band and high-efficiency multidimensional vibration suppression is realized.

This invention discloses a variable-step automatic gain control method based on an adaptive window, applicable to signal automatic gain control in data acquisition systems. The method preprocesses the input signal and samples it using an ADC to obtain a digital signal, which is then fed into an FPGA. A zero-crossing detection method based on a hysteresis comparator is used to estimate the signal frequency, and the window length is calculated based on this adaptive amplitude matching. The average signal amplitude within the window is then calculated and compared with a preset automatic gain threshold range. The gain step value is dynamically matched and updated to the variable gain amplifier to complete closed-loop control. Finally, the gain value is used to perform an amplitude inverse calculation to restore the signal. This invention improves the detection accuracy and dynamic response speed of the system over a wide bandwidth and dynamic range, eliminates the hardware resource consumption of floating-point division operations, and accurately outputs a distortion-free original proportional signal stream.

Etch-free optical metasurface (free space optical resonator) supporting million-quality-factor resonances at visible wavelengths in free space and associated systems and methods are described. In an embodiment, a free space optical resonator includes: a low refractive index layer; a high refractive index layer having a wide band gap; and a low refractive index resist layer. The high refractive index layer is disposed between the low refractive index layer and the resist layer. The resist layer includes a 2-D subwavelength periodic pattern of openings. The low refractive index layer, the high refractive index layer and the low refractive index resist layer are arranged as a vertical stack. The optical resonator is lossless at visible wavelengths of light.

The utility model provides a gear acoustic metamaterial structure for wide band noise reduction, include: bottom plate and set up on the acoustic metamaterial unit of bottom plate, acoustic metamaterial unit includes several layers of resonant cavity, and resonant cavity is different section radius and coaxial setting's cylinder cavity respectively, the outer wall of each layer resonant cavity is provided with the opening of vertical through -penetration respectively, the inner wall of the resonant cavity of outermost layer and the outer wall of other resonant cavity are provided with gear structure respectively, the utility model discloses first introduce multilayer gear shape resonant cavity to acoustic metamaterial, and the gear -like structure is strengthened sound wave reflection and energy dissipation to break through the performance limit of traditional helmholtz resonator.

The application relates to a wide-band circularly-polarized duplex feed network in the technical field of satellite communication, in particular to a wide-band circularly-polarized duplex feed network which comprises three layers of metal layers connected by screws, a first waveguide cavity and a second waveguide cavity formed in the inside, and horizontal polarization ports and vertical polarization ports arranged on the three layers of metal layers for entering electromagnetic waves; a low-frequency left-circularly-polarized port and a low-frequency right-circularly-polarized port are arranged on the first waveguide cavity for outputting low-frequency linearly-polarized signals; a high-frequency left-circularly-polarized port and a high-frequency right-circularly-polarized port are arranged on the second waveguide cavity for outputting high-frequency linearly-polarized signals; the application can realize the functions of simultaneous transmission and reception, time-sharing transmission and reception, and left and right circular polarization; when used for single circular polarization, the corresponding cross-polarization ports are connected with loads, and at this time, the application is used as a single-rotation-direction antenna feed source; when used for double circular polarization, all the ports are connected with corresponding radio frequency channels.

The application discloses a kind of based on low-loss anti-resonance hollow waveguide broadband high-efficiency leaky-wave antenna design method and structure, its technical scheme includes: first based on anti-resonance principle design single dielectric wall hollow waveguide;Further introduce second dielectric wall optimization form double dielectric wall anti-resonance hollow waveguide, significantly enhance the transverse restraint to electromagnetic energy in air cavity by cascading reflection effect, realize super low loss transmission;Finally, etching periodic radiation slot in the upper layer metal plate of double dielectric wall hollow waveguide, construct leaky-wave antenna with frequency scanning function.The application uses air as main transmission medium, fundamentally reduces dielectric loss, so that the antenna has ultra-low transmission loss and ultra-high radiation efficiency in wide frequency band, while the structure is simple, process compatibility is strong, only through standard PCB process can be realized, can be widely used in 5G / 6G communication, millimeter wave radar, terahertz imaging and other high-performance wireless systems.

This invention provides a beamformer-based feed design method. By utilizing a pattern synthesis method based on Fourier transform, the excitation amplitude and phase of each array element are obtained through inverse synthesis. The obtained excitation amplitude and phase of each array element are then assigned to that element. Full-wave simulation of the array is performed in electromagnetic simulation software to obtain the array's radiation pattern, which is compared with the desired feed radiation pattern. If deviations exist, the excitation amplitude and phase can be adjusted until the overlap with the desired feed radiation pattern reaches the target. This invention achieves nearly 90% efficiency after illuminating the reflector, far exceeding the efficiency of conventional feeds illuminating reflectors. Furthermore, different excitation coefficients can be flexibly constructed for different frequencies, achieving high-precision approximation of the ideal delta function across a wide frequency range. Higher gain can be obtained with the same aperture, or the aperture size of the reflector antenna can be reduced with the same gain requirements. This significantly improves system performance and reliability.