19 results about "Single polarization" patented technology

An antenna, an antenna device and a communication base station belong to the technical field of antennas and aim to reduce coupling among multi-band signals, the antenna is configured to radiate a signal of a first band and comprises at least one single-polarized radiator, and the single-polarized radiator comprises a radiation structure and a plurality of radiation structures, comprising a first dielectric substrate and a radiation arm located on one side of the first dielectric substrate, the radiation arm comprises a plurality of radiation branches, and the plurality of radiation branches are sequentially connected to form a ring; the feed structure is connected with the radiation structure and is configured to feed an electric signal into the radiation structure; and the filtering structure is at least loaded between the radiation branches and is configured to weaken the influence of the antenna on a signal of a second frequency band, and no overlapped frequency band exists between the second frequency band and the first frequency band.

This invention provides a dual-polarized butterfly slot antenna, comprising a radiating component, a reflecting component, and a cavity component. The dual-polarized butterfly slot antenna has mutually perpendicular length, width, and height directions. The radiating component and the reflecting component are arranged parallel to each other along the height direction. Projections along the height direction onto the same plane perpendicular to the height direction are made, with the projection of the radiating component located within the projection of the reflecting component. A cavity component is fixedly connected to each end of the reflecting component along the width direction, and each cavity component extends along the height direction towards the radiating component. The side of each cavity component away from the reflecting component is engaged with the radiating component. The radiating component includes two single-polarized units, each with a butterfly slot. The technical solution provided by this invention can solve the problems of complex structure, difficulty in assembly and production, and low radiation gain in existing dual-polarized antennas.

The application discloses a dual-polarization weather radar speed ambiguity resolution method based on lag-1 cross-correlation, which utilizes lag-1 cross-correlation of adjacent radial directions instead of radial velocity of the adjacent radial directions in a traditional algorithm to calculate an ambiguity resolution reference speed. This makes the ambiguity resolution speed range of the ATAR mode expand to twice that of the traditional algorithm, so that the speed measurement range is consistent with that of the single-polarization mode. Application of the algorithm improves the reliability of speed data of the ATAT mode weather radar in severe weather detection.

The present application belongs to the technical field of synthetic aperture radar interferometry, and provides a kind of spaceborne multi-baseline InSAR data vegetation height retrieval method, comprising: obtaining spaceborne multi-baseline InSAR data and external DEM data, and carrying out main auxiliary image registration operation to multi-baseline InSAR data;Based on spaceborne multi-baseline InSAR data, obtain the vertical wave number of the multiple interference baselines formed by main satellite and auxiliary satellite and interference complex coherence;Multi-baseline is respectively constructed RVoG model, and vertical wave number and interference complex coherence are substituted into the RVoG model of multi-baseline, and three-dimensional look-up table is formed respectively;The intersection of three-dimensional look-up table is obtained, and the unknown parameter at intersection is the vegetation scene parameter obtained by inversion.The present application utilizes the multiple independent single polarization interference data that can be provided by spaceborne multi-baseline InSAR satellite system, and through constructing three-dimensional look-up table between extinction coefficient, vegetation height and ground scattering ratio and interference complex coherence, the effective inversion of vegetation height is realized.

The application provides a BB84 polarization encoding integrated photon chip and an encoding method, which can be applied to the technical field of quantum communication and integrated photonics. The chip sequentially integrates a decoy state generation unit, a polarization encoding unit and an optical switch unit through optical paths on a single integrated photon chip, aiming to solve the problems of large volume, poor stability and slow switching speed existing in traditional discrete optical encoding schemes. The polarization encoding unit adopts a discretization generation mechanism based on multiple parallel fixed optical paths to synchronously generate four polarization quantum states required by the BB84 protocol; the optical switch unit high-speed gates the fixed optical paths to realize random output of a single polarization quantum state. The application realizes full-function monolithic integration of decoy state generation and polarization encoding, and has the beneficial effects of compact structure, stable output, high speed, low loss and strong anti-interference ability.

The application discloses a kind of laser scanning detection method and system of glass surface defect, belong to optical intelligent detection technical field.This method establishes multi-angle laser scanning optical path, makes incident angle in 15° to 75° range continuously adjustable, and drives light beam to carry out two-dimensional scanning;Polarization light path system is configured, incident laser is converted into single polarization state linearly polarized light, and reflected light is divided into two ways by beam splitter at detection end, respectively for monitoring total light intensity and measuring light intensity after polarization analysis, and performing polarization state orthogonal alignment process, so that the transmission axis of polarization analysis element and the polarization direction of mirror reflection component are orthogonal;Double-mode scanning detection is executed, low-angle incidence mode is used to quickly establish overall topography profile, and high-angle incidence mode is used for fine detection of specific area.The application can effectively suppress the mirror reflection interference of high-reflectivity glass surface, avoid signal saturation, and realize high-precision and high-efficiency glass surface flatness detection.

This application proposes a Littman external cavity tunable laser, relating to the field of laser technology, comprising: a semiconductor optoelectronic device for outputting a broadband optical signal; a focusing module for collimating and focusing the broadband optical signal, projecting the focused light onto a mode-spot conversion polarization rotating beam splitter; a mode-spot conversion polarization rotating beam splitter for adapting the mode size and controlling the polarization state of the focused light, filtering out non-target polarization components, outputting a target polarized optical signal with a single polarization state, and also for adapting the mode size of the reflected external cavity feedback light; and a tuning output module for spatial dispersion separation of different wavelength components, generating zero-order diffracted light as the laser output light, and generating first-order diffracted light as the external cavity feedback light, and achieving laser wavelength tuning by changing the wavelength of the external cavity feedback light. This application can solve the defect of unstable polarization state during the tuning process of traditional Littman lasers.

The utility model provides a kind of single polarization spotlight antenna, by setting fixed device including installation side plate and antenna mounting plate, and one end of installation side plate and antenna mounting plate is hinged rotation connection, the other end is connected by adjusting rod, the relative angle between antenna mounting plate and installation side plate can be flexibly adjusted, to realize the adjustment of antenna body angle when installing;Quick release device on antenna mounting plate makes that antenna body can realize quick disassembly and assembly, improves the efficiency of installation and disassembly, greatly simplifies installation process, improves the convenience of operation, especially in multi-frequency band, high-precision application scene, this flexibility and convenience can significantly improve product performance and optimize user experience. Thirdly, the antenna body of the application covers a wide frequency range (700-3700MHz), provides rich frequency band resources for selection and allocation, so that the working frequency band can be flexibly selected and adjusted according to the specific application requirements and scene, to realize more optimized network performance.

A polarization conversion metasurface design method is used to realize wideband radar scattering cross section reduction. The feature is to design a polarization conversion metasurface unit first, each polarization conversion metasurface unit includes a bottom metal unit, an upper layer metal etching microstructure unit and a dielectric substrate unit; the configuration of different polarization conversion units is described by the difference of metal etching microstructure and the change of dielectric substrate thickness; the single polarization conversion metasurface unit is modeled, the scattering characteristics are calculated, the configuration optimization and parameter optimization of the metal etching microstructure and the dielectric substrate unit of the polarization conversion unit are carried out based on the genetic algorithm, and the optimal polarization conversion unit structure is obtained; the polarization conversion metasurface with periodic metal etching microstructure array is constructed, the polarization conversion metasurface capable of reducing scattering is designed, and the scattering characteristics are calculated. The mirror polarization conversion metasurface is used as the implementation form to realize the scattering reduction of the incident electromagnetic wave, which is conducive to the automatic design of the polarization conversion metasurface with special working frequency requirements.

This invention relates to the field of ground-penetrating radar detection and civil engineering structure inspection technology, and discloses an anchor cable positioning method based on single-hole radar waveform characteristics and dual-hole geometric constraints, including the following steps: Step 1: Construct at least two parallel boreholes, acquire borehole wall images through borehole optical imaging, and identify geological information based on the images; Step 2: Perform single-hole reflection scanning and cross-hole multi-offset scanning using a single-polarization borehole radar to acquire single-hole reflection data and cross-hole scanning data; Step 3: Based on the cross-hole scanning data, invert and construct an inter-hole electromagnetic wave velocity field model; Step 4: Use geological information as constraints to correct the inter-hole electromagnetic wave velocity field model; Step 5: Based on the inter-hole electromagnetic wave velocity field model, perform offset processing on the single-hole reflection data of each borehole to obtain a radar profile; thereby achieving precise positioning of oblique anchor cables through algorithmic innovation.

The application provides an epsilon phase gallium oxide based material and a crystal student growth method and use thereof, the crystal student growth method comprising epitaxial growth of the epsilon phase gallium oxide based material on a substrate with a polar surface, so that the epsilon phase gallium oxide based material has the same polarization direction as the polar surface. The application selects a substrate with a specific surface polarity and controls the growth of high-quality crystals through substrate and template engineering, thereby guiding controllable polarity growth by using the specific substrate as a template. Thus, active regulation of the polarization direction of the epsilon phase gallium oxide based material can be supported, the bottleneck of single polarization characteristics of the material system is broken, a key material foundation for developing a new generation of high-performance functional devices based on polarization engineering is laid, and the application has important scientific and application values.

The application provides a two-dimensional beam scanning staggered compact millimeter wave array antenna, relates to the technical field of millimeter wave antenna and array, and is composed of dual-polarized patch broadside antenna units and single-polarized patch end-fire antenna units, so that multiple radiation modes can work cooperatively and stable array scanning performance can be realized under the condition of limited planar size and extremely low profile. The end-fire antenna unit is composed of a microstrip dipole, a bending structure is formed by the fact that the dipole arm is perpendicular to the feed line, the end-fire unit realizes stable end-fire radiation in a compact space, the working frequency is controlled by adjusting the size of the dipole arm, and the requirements of size controllability and frequency designability of the millimeter wave array are met. The dual-polarized patch broadside antenna unit is used, two mutually orthogonal coupling slots are etched on the floor, and microstrip feed lines are connected, respectively, so that the horizontal polarization and the vertical polarization can be independently excited, and the polarization flexibility and direction control ability of the array in two-dimensional scanning are improved.

The application discloses a dark field confocal microscopic measuring device and method based on circular dichroism, which comprises a circular dichroism light beam generating module, a ring light generating module, a light beam scanning illumination module and a dark field confocal detection module; linearly polarized light is incident on a polarization grating to simultaneously generate first polarized light and second polarized light, and an acousto-optic modulator is controlled to modulate the light beam into a pulse form to realize that the polarized light alternately performs illumination in the same period. The light beam is modulated into a ring illumination light beam via a cone lens group, and a complementary aperture stop is utilized to collect scattering signals, and the collected scattering signals of the first polarized light and the second polarized light are differentiated. Direct analysis of the scattering signals in a single polarization state can extract three-dimensional distribution information of defects such as surface scratches, abrasions and subsurface cracks, bubbles and the like; analysis of the scattering signal difference under illumination of left-handed and right-handed ring light can obtain optical chirality information of micro-nano structure materials, and the sensitivity of chirality detection is improved.

A micro-electromechanical systems (MEMS) steered antenna array may include micro-electromechanical systems which may mechanically steer the individual radiating antenna elements of the array independently from each other. The antenna elements may be mechanically steered to form subarrays which may be separately steered. The micro-electromechanical systems may mechanically adjust the orientation of the antenna elements for linear polarization control and to reduce shadowing from adjacent of the antenna elements. The micro-electromechanical systems may also adjust rotation independently to form sub-groups of elements to fine tune for a single polarization or a plurality of different polarizations. Individual control over physical positioning of directional radiating elements at the element level of an array system realizes the benefit of mechanically orienting the entire assembly, without the penalty of size, weight, power, and mechanical steering speed, while remaining a stationary platform and enabling an array to be adaptable in real time to various configurations.

The application discloses an agricultural pest control method based on polarized light interference, which comprises the following steps: obtaining the visual spectrum of pests and the polarization navigation habit; selecting a polarization light control medium with a polarization degree greater than 60% in the 300nm-600nm wave band; based on the migration direction of pests, laying a strip or array with a vertical or greater than 45° angle; using the polarization light control medium to construct an interference light field with a deviation from the polarization direction of natural light, and making the light field present polarization degree fluctuation and direction jitter through a micro-nano composite structure array to disturb the navigation of pests; and dynamically adjusting according to the pest density and the light requirement of crops. Through the synergistic effect of polarization direction deviation and spatial non-uniformity, the application solves the problem that a single polarization light field is easily adapted and compensated by pests, the pest control effect is as high as 95%, and the pest control effect is all above 88% under the combination of different substrates and fillers, so that the light requirement of photosynthesis of crops is ensured and efficient and green prevention and control are realized.

This invention discloses a liquid dielectric rod antenna with reconfigurable polarization, comprising an antenna housing, a metal waveguide, a loading container, an RF coaxial probe, and a metal cylinder. The antenna housing is mounted on the metal waveguide, with helical first to third channels arranged along its axis. The loading container has excitation channels passing through its two sides and sealed to the container. The metal waveguide encloses the loading container and has mounting holes communicating with the excitation channels. The inner conductor of the RF coaxial probe extends into the excitation channels and connects to the metal cylinder. The loading container is filled with dimethyl silicone oil. When tetrahydrofuran is injected into the first channel, the dielectric rod antenna operates in circular polarization mode; when tetrahydrofuran is injected into the first to third channels simultaneously, the dielectric rod antenna operates in linear polarization mode. This invention solves the problem that traditional dielectric rod antennas can only operate in a single polarization mode, and has great potential in future wireless communications.

This invention relates to the field of jewelry testing technology, and provides a light source adaptive adjustment device for jewelry testing, including a base and a worktable. A multispectral array light source is arranged above the worktable, and a camera is arranged on one side of the multispectral array light source. The multispectral array light source provides ultraviolet light, white light, near-infrared light, and various monochromatic visible light. A lens switching mechanism is installed at the output end of the multispectral array light source, which can switch the lens to a condenser lens or a diffuser lens. A third motor is fixedly installed on the camera, and a polarization mode switching disk is installed on the output shaft of the third motor. The polarization mode switching disk consists of four sets of polarization mode plates, which correspond to no polarization mode, single polarization mode, cross polarization mode, and parallel polarization mode, respectively. Through the coordinated automatic switching of the lens and polarization mode, multi-level and multi-dimensional observation from the surface to the interior is realized, improving the testing efficiency.

The application discloses a rice lodging monitoring method and device, a terminal and a storage medium, and relates to the field of agricultural remote sensing.The method determines an initial radar feature map according to full-polarization unmanned aerial vehicle synthetic aperture radar data of a target rice area, extracts each polarization feature parameter according to the initial radar feature map and stacks the polarization feature parameter to determine a three-dimensional radar feature cube; the method extracts each polarization feature parameter according to the initial radar feature map and stacks the polarization feature parameter to determine a three-dimensional radar feature cube; the method performs deep characterization and classification on the three-dimensional radar feature cube through a trained rice lodging monitoring model to determine a lodging monitoring result of the target rice area.Because the application performs multi-direction and multi-dimensional feature extraction on full-polarization unmanned aerial vehicle synthetic aperture radar data and fuses target three-dimensional radar features, the application can effectively solve the problem that existing technologies are mostly limited to backscattering coefficients or single polarization features and are difficult to fully mine multi-dimensional structural information contained in synthetic aperture radar data.