131 results about "Circular polarization" patented technology

This invention discloses a coaxial telecentric polarization hyperspectral imaging device and a biological tissue detection system. The device includes: a light source emitting unpolarized light; a circular polarization generator converting the unpolarized light emitted by the light source into circularly polarized light; the circularly polarized light being coupled into a coaxial telecentric lens via a coaxial optical interface; the coaxial telecentric lens reflecting the circularly polarized light, which then illuminates the target object plane; the signal reflected from the target object re-enters the coaxial telecentric lens and is transmitted to a polarization analyzer module via a beam splitter. The polarization analyzer module includes a first waveplate and a first linear polarizer. The first waveplate receives the signal transmitted from the beam splitter and transmits the signal to the first linear polarizer. The first linear polarizer sends the output light to a hyperspectral camera, and the hyperspectral camera sends the output image to a computer for image analysis.

This invention discloses a dual-frequency circularly polarized fusion antenna with a high frequency ratio and its design method. It includes a first and a second dielectric substrate, with the first substrate positioned above the second. The lower surface of the first substrate is a copper-clad ground plane, and its upper surface is provided with a first, second, third, and fourth metal radiator. A metal post is loaded at one end of each radiator near the center of the dielectric substrate and connected to the ground plane, while a millimeter-wave metal probe is loaded at the other end away from the center. The lower surface of the second dielectric substrate has a microwave feed network and four 180-degree phase difference power dividers. The output ports of the microwave feed network are connected to the four microwave metal probes, and the output ports of the 180-degree phase difference power dividers are connected to eight millimeter-wave metal probes. This invention features dual-frequency circular polarization, effectively reducing the impact of multipath effects and enabling the reuse of radiators, thereby reducing the space resource requirements of communication equipment.

This invention provides an indoor positioning system and method. A WiFi signal is generated via a WiFi access point. A first leaky-wave antenna converts the received WiFi signal into a first circularly polarized signal and propagates it to a target receiver. A second leaky-wave antenna converts the received WiFi signal into a second circularly polarized signal and propagates it to the target receiver. The second circularly polarized signal is orthogonal to the first circularly polarized signal. The target receiver obtains the target's indoor location information based on the first and second circularly polarized signals. This method eliminates the need for the target to switch between multiple WiFi access points, is less affected by WiFi signal quality, has strong applicability, and provides more accurate positioning.

An antenna unit includes an antenna radiation element and a polarization selection circuit. The polarization selection circuit is configured to selectively convert an input signal to a first output signal and / or a second output signal. The first output signal and / or the second output signal is fed to the antenna radiation element so as to generate linearly polarized electromagnetic waves or circularly polarized electromagnetic waves which are radiated out by the antenna radiation element. The first output signal and the second output signal have a first phase difference therebetween that is fixed at a specific value between 0-180°.

The application relates to a laser surface periodic structure construction method based on geometric structure guidance, and belongs to the field of laser micro-nano processing. The method first constructs a geometric structure with characteristic size and spatial arrangement on a material surface, and the geometric structure is obtained through mechanical processing, high-energy beam processing or other forming methods; then under the condition of random polarization or circular polarization laser irradiation, the geometric structure modulates the near-surface electromagnetic field distribution, thereby forming a periodic micro-nano structure. By adjusting the size, spacing and arrangement form of the geometric structure, controllable construction of one-dimensional gratings and two-dimensional array structures can be realized. The period of the formed structure is related to the wavelength of the incident laser, and satisfies the near-wavelength scale relationship (Lambda approximately 0.8-1.2 lambda), and can be adjusted by adjusting the wavelength of the laser. The method can realize large-area periodic structure preparation, and the process is relatively simple, and is suitable for surface optical regulation and functional interface construction.

To provide an optical laminate including a liquid crystal alignment cured layer and suppressing peeling defects when peeling the alignment substrate. 【Solution means】The optical laminate according to an embodiment of the present invention has a polarizing plate including a polarizer, a retardation layer laminated on the polarizing plate via a first adhesive layer, and a substrate laminated on the retardation layer in a peelable manner; the retardation layer includes, in order from the polarizing plate side, a first liquid crystal alignment cured layer and a second liquid crystal alignment cured layer laminated on the first liquid crystal alignment cured layer via a second adhesive layer; the retardation layer as a whole has a circular polarization function or an elliptical polarization function, has a relationship of Re(450)<Re(550)<Re(650), and its Nz coefficient is 0.30 to 0.70; the substrate is an alignment substrate of the second liquid crystal alignment cured layer, and its tensile elastic modulus is 3000 N / mm 2 or more.

The application provides a wideband co-transmit-receive antenna array for X-band airborne SAR, and belongs to the technical field of antenna control, and a specific scheme comprises a rectangular dielectric resonator antenna array, a dielectric substrate, a double-layer feed network, a cross-shaped slotted floor and a nylon support column; the rectangular dielectric resonator antenna array is a 4*4 array and comprises four groups of antenna subarrays with the same size and the same spacing; the dielectric substrate comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, and the first dielectric substrate is located below the rectangular dielectric resonator antenna array; the structure of the antenna array realizes co-transmit-receive of the same right-handed circular polarization, and the isolation of the transmit-receive ports reaches a performance of >30dB.

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.

The application relates to the technical field of antennas, in particular to a wideband satellite communication antenna. The wideband satellite communication antenna comprises a grounding plate, a feeding device, a patch, a connecting device and a coupling branch. The grounding plate is arranged at the bottom of an antenna structure, the patches are arranged above the grounding plate at intervals, at least one coupling branch is arranged at the periphery of the patch at intervals, one end of the coupling branch is connected with the grounding plate, the other end of the coupling branch is an open circuit structure, the feeding device inputs a radio frequency signal to the patch or the coupling branch, the edge area of the patch and / or the open circuit end area of the coupling branch is provided with the connecting device, and the connecting device forms an impedance loading or electrical coupling path between the patch and the grounding plate and between the coupling branch and the grounding plate. The application can consider the wideband and miniaturization of the antenna, has strong orthogonal mode independent regulation and control ability, has a simple structure and is easy to implement in engineering, and has good engineering implementability and application value in the aspects of miniaturization, light weight, wideband and high-performance circular polarization radiation.

This invention discloses a high-aperture-efficiency terahertz antenna, comprising: a metal resonant cavity unit, which includes a metal feed layer and a metal resonant layer stacked sequentially, wherein the metal resonant layer has a resonant through slot; and a metasurface structure unit stacked and connected to the surface of the metal resonant layer, the metasurface structure unit including a first metal layer, a dielectric substrate, and a second metal layer stacked sequentially connected to the surface of the metal resonant layer, wherein a hollow position is formed in the center of the second metal layer, and an M-row N-column metasurface reflector component is disposed within the hollow position, where M and N are both 5-7. Based on the metal feed layer and the metasurface structure unit with the dielectric substrate, this antenna achieves high aperture efficiency and high gain in the terahertz band, stable beam performance, a simple and highly integrated antenna structure, and high circular polarization conversion efficiency, meeting the requirements of long-distance communication.

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.

This application provides an antenna structure based on a slot gap waveguide, comprising a first cover plate, a second cover plate, and an intermediate conductive plate spaced between the first and second cover plates; a first slot is provided on the surface of the first cover plate adjacent to the intermediate conductive plate; a second slot is provided in the intermediate conductive plate extending along its thickness direction; a plurality of first conductive pins are periodically distributed on the surface of the intermediate conductive plate adjacent to the first cover plate, the first cover plate, the intermediate conductive plate, and the plurality of first conductive pins constituting a first antenna element; a plurality of second conductive pins are periodically distributed on the surface of the intermediate conductive plate adjacent to the second cover plate, the second cover plate, the intermediate conductive plate, and the plurality of second conductive pins constituting a second antenna element; the first antenna element transmits horizontally polarized waves when fed with a signal alone, and the second antenna element transmits vertically polarized waves when fed with a signal alone; the first slot and the second slot are configured to achieve circular polarization characteristics when the first antenna element and the second antenna element are simultaneously fed with signals of equal amplitude and a phase difference of 90°.

The display device (10) includes a sensor device (15) comprising: a surface-emitting semiconductor laser (102) configured to emit laser radiation (17) along an emission direction; and a metasurface (105) configured to convert the polarization state of the laser radiation (17) into a circular polarization state. The display device (10) also includes an array (22) of light-emitting elements (23) configured to emit electromagnetic radiation (24) along an emission direction, the array (22) of light-emitting elements (23) being arranged along the emission direction on one side of the sensor device (15).

A dual-polarized or circularly polarized microstrip antenna employs a multi-layer stacked structure, comprising a feed layer, an upper dielectric substrate, a radiating layer, a prepreg layer, a lower dielectric substrate, and a ground layer connected sequentially from top to bottom. The upper dielectric substrate, radiating layer, prepreg layer, lower dielectric substrate, and ground layer are all square structures with chamfered corners. Rectangular slots are formed at the center edges of the four sides of the squares in the upper dielectric substrate, radiating layer, and prepreg layer. This invention introduces differential feeding, forming a ring structure with openings in the radiating layer and slots along ±45° directions. Radiation through these slots excites higher-order modes, resulting in higher gain. This antenna has a simple structure, is easy to manufacture, and offers significantly improved performance. It exhibits good impedance and gain bandwidth within the operating frequency band, low sidelobes, strong directivity, and high polarization purity. Furthermore, depending on the power divider applied, it can achieve either dual-polarized or circularly polarized operating modes.

The application discloses a low-profile full-metal circularly polarized reflective array. The reflective array antenna comprises a circularly polarized horn antenna for feeding, a full-metal circularly polarized reflective array, and a support for fixing the circularly polarized horn antenna and the full-metal circularly polarized reflective array. The circularly polarized reflective array is composed of units with different reflection phases, and the units are adjusted by rotation to form a required radiation beam. The antenna has a full-metal structure, and has certain advantages over a reflective array realized by using a dielectric substrate in application scenarios such as high power and conformal. The antenna has the characteristics of simple structure, low profile, low cost and short design period, and is suitable for satellite communication and radar fields.

This application relates to a universal compensation glasses and method. The universal compensation glasses and method include: a frame and a lens. The lens is disposed on the frame and includes a protective outer layer, a linear polarization layer, a circular polarization conversion layer, a phase compensation layer, and a contact layer. One end of the linear polarization layer is adhered to the protective outer layer, and the other end of the linear polarization layer is adhered to one end of the circular polarization conversion layer, the other end of the circular polarization conversion layer is adhered to one end of the phase compensation layer, and the other end of the phase compensation layer is adhered to the contact layer. The solution provided by this application can solve the "wide viewing angle washout phenomenon" of VA panels or IPS panels.

The present specification provides a satellite communication antenna and electronic equipment, the antenna comprises a first radiation branch and a parasitic unit, the parasitic unit is a ring branch, and at least part of the branch is close to the first radiation branch and is coupled, and the parasitic unit is connected to the ground through at least one ground point.The satellite communication antenna of the embodiment of the present specification forms circular polarization by using the coupling effect of the parasitic unit, greatly improves the antenna gain compared with linear polarization satellite antenna, and improves the actual experience of satellite communication.And the radiation direction of the satellite communication antenna is mainly towards the zenith region, so that the antenna efficiency is higher, the satellite searching and communication efficiency in the state of user handheld mobile phone is improved, and the user experience is improved.

The application discloses a miniaturized high-isolation receiving array applied to GNSS and belongs to the technical field of antennas. The miniaturized high-isolation receiving array comprises an antenna unit and a cross-shaped electron bandgap structure, and the antenna unit is arranged in a right angle of the structure. The antenna unit is surrounded by three dielectric substrates to form a closed cuboid air cavity, a second substrate is provided with a reflecting ground, and a third substrate is covered with a bent gable-shaped metal side wall, so that left-handed or right-handed circular polarization can be realized; and a first substrate is provided with an open ring-shaped dipole arm. The cross-shaped electron bandgap structure comprises a mushroom-shaped structure, a cross-shaped metal reflecting ground and a cross-shaped dielectric block, and a top metal patch of the mushroom-shaped structure is connected with the metal reflecting ground through a metal column. The miniaturized high-isolation receiving array adopts high dielectric constant substrates to realize miniaturization, the metal side wall is connected with the reflecting ground to improve the radiation effect, the size of the dipole arm and the opening are adjusted to form circular polarization radiation, and the units are sequentially rotated to form an array and the mushroom-shaped structure is loaded to realize high isolation.

The application provides a dual-frequency dual-mode dual-polarized antenna based on mode modulation and application, and belongs to the technical field of antennas. The antenna is composed of a flexible dielectric substrate, a circular metal radiation patch, a metal ground and a feed point. The key innovation lies in a plurality of groove structure groups etched on the radiation patch, including a center groove, a first groove group, a second groove group, a T-shaped groove group and a circular groove group. The groove structure groups are designed to be able to excite mode and mode, so that the antenna realizes directional circular polarization mode at a 2.4 GHz frequency band and omnidirectional linear polarization mode at a 5.7 GHz frequency band. The application adopts the above-mentioned dual-frequency dual-mode dual-polarized antenna based on mode modulation and application, and through optimization of groove parameters and feed point positions, realizes efficient work of dual-frequency bands, solves polarization mismatch problems and realizes intelligent adaptation of dual modes.

This invention discloses a method and system for optimizing the cleaning efficiency of a glass cleaning machine, relating to the field of optical inspection technology. The method includes: imaging and weighing the glass to determine its shape; setting the clamping fixture and mapping different zones to obtain a table corresponding to the zone coordinates and optical windows; using this table, performing multi-angle shadow plate illumination / discontinuity imaging, two-state polarization-gated imaging, and dual-band transmission acquisition to generate a zone contamination indicator map; performing cross-circular polarization phase deflection fringe sequence measurement and calculating the surface gradient abrupt change distribution on the glass area covered by the zone contamination indicator map to obtain a zone damage indicator map; mapping the zone contamination indicator map and zone damage indicator map to a zone process script, performing zone cleaning and drying to form the cleaned glass state. This invention uses dual-band transmission verification to lock in residual zones, and then uses key zone phase deflection verification to constrain and maintain the reprocessing range, reducing invalid reprocessing.

The invention relates to an antenna for signal transmission using circularly polarized radio signals, comprising: a printed circuit board (20), an electrically conductive radiator structure (11), and a dielectric support element (30). The radiator structure (11) comprises at least one conductor loop (12) with a closed, rotationally symmetrical basic shape. The support element (30) supports the radiator structure (11) at a predetermined distance (d) from the printed circuit board (20), such that the radiator structure (11), in a supported state, is arranged substantially parallel to the printed circuit board (20) with respect to a main surface 12a of the at least one conductor loop (12). Each conductor loop (12) has a plurality of bend sections (13) which project at predetermined positions along the main surface (12a) of the at least one conductor loop (12) relative to it and in the direction of the printed circuit board (20).At least two of the bent sections (13) form a respective antenna feed surface (14) for operating the antenna (10). For this purpose, the circuit board (20) has coupling surfaces (22) for the respective antenna feed surfaces (14) at predetermined positions. In the supported state of the radiator structure (11), the respective antenna feed surface (14) is arranged above one of the coupling surfaces (22) and is capacitively coupled to the respective coupling surface (22) for operating the antenna (10).

The invention discloses a polarized reconfigurable reflective metasurface system driven by an eye tracker and a method, and belongs to the technical field of wireless communication. The system comprises an eye movement tracking module, a central processing unit, a programmable reflective metasurface array and a control circuit. The eye movement module acquires three-dimensional coordinates of a fixation point of a user in real time; the processor calculates a target beam state and regulation and control parameters according to the coordinates, the metasurface position and communication requirements; the metasurface array is composed of a plurality of independently controllable super atoms, each super atom comprises a pi-type structure and at least two tunable devices, and reflection response reconstruction is achieved by switching device state combination. And the control circuit converts parameters into driving signals to control each device. According to the invention, near-field three-dimensional dynamic focusing and far-field beam deflection driven by eye movement are realized, adaptive agility between vertical / horizontal polarization and left / right-handed circular polarization is supported, and the problems of lack of intention interaction, inflexible polarization regulation and control and insufficient near-field focusing capability of an existing system are solved.

The present application discloses a visual optical system, which includes, along the optical axis from the human eye side to the image source side: a first element group with positive optical power; a second element group with optical power; a third element group with positive optical power; the first element group includes a first lens, a quarter-wave plate, and a reflective polarizing element; wherein, for the visual optical system, the effective focal length is f, the effective focal length of the first element group is F1, and the combined focal length of the second element group and the third element group is f23, and they satisfy: 1.5 < f / F1 + f23 / f < 6.0. Through the visual optical system of the present application, the first element group has positive optical power, which is beneficial to converging light rays and meets the actual application conditions. The quarter-wave plate can convert light rays between the circular polarization state and the linear polarization state. Combining with the transmission of polarized light rays in a specific direction and the reflection characteristics of the orthogonal direction by the reflective polarizing element, the optical path is folded, which is beneficial to realizing a short focal length and wide angle design within a limited TTL range.

This disclosure provides an antenna assembly and electronic device, relating to the field of electronic equipment technology. The antenna assembly provided includes: a radiating section, comprising at least a first radiator, a second radiator, and a third radiator connected in sequence by bending, the first and third radiators being arranged parallel to each other; and a frame antenna, which is coupled to the radiating section via spatial electromagnetic waves, with a first angle between the current direction of the frame antenna and the current direction of the second radiator. Because of the first angle between the current direction of the frame antenna and the current direction of the second radiator, the radiating section can provide a current component perpendicular to the current direction of the frame antenna, thereby reducing the axial ratio of the antenna radiating towards the sky, increasing the circular polarization radiation gain of the antenna, and improving communication stability. Furthermore, the design of the radiating section can effectively control the size of the antenna assembly, facilitating integration and installation.

This utility model discloses an auxiliary orientation device for a circularly polarized horn antenna, including a circular ring, a cylindrical body coaxially disposed at the center of the circular ring, and a laser lamp mounted on the cylindrical body. The circular ring is provided with a fixing assembly consisting of hooks, connecting rods, and sliding rods for hanging on the edge of the antenna horn mouth. The sliding rods are slidably disposed on the circular ring to accommodate antennas of different diameters. The core of this utility model is that a gear is rotatably disposed inside the cylindrical body, and each sliding rod is connected to an L-shaped rack through a connecting block. The rack is inserted into the cylindrical body and meshes with the same gear to form a linkage mechanism, ensuring that multiple hooks move synchronously and automatically center during adjustment. A laser beam coaxial with the antenna axis is emitted by the laser lamp to provide an intuitive and accurate visual reference for the antenna orientation. This utility model solves the problems of difficult initial antenna orientation, low efficiency, and poor accuracy in the prior art, and has the advantages of compact structure, convenient operation, and strong versatility.

In improving the power reception efficiency of wireless power transmission systems, optimizing the operation of rectifier circuits using MPPT control presents challenges depending on the magnitude of the received power, such as increasing the size of the circuit and imposing high voltage resistance requirements on the rectifier and charge control circuits. Furthermore, even if optimal operation of the rectifier circuit can be achieved, optimizing the charging of the energy storage elements remains difficult. Moreover, even with power transmission using retrodetective methods, measures are needed to ensure that the power is received without loss by the receiving antenna and to prevent a decrease in power reception efficiency. [Solution] Prioritizing the optimization of the rectifier circuit's operation, the charging current control unit sequence-controls the charging current of the linear charging control unit to maintain the burst mode operation of the buck-boost converter. Furthermore, the antenna system for receiving circularly polarized high-frequency power is arranged and grouped along the rotation direction of the circular polarization to connect the output voltages from each rectifier circuit in parallel without coupling loss and output them to the charging control unit.

This invention relates to a polarization-customized holographic device based on a spin-decoupled plasmonic metasurface, belonging to the fields of micro-nano optics, diffraction optics, and holographic imaging. The device employs a three-layer metal-dielectric-metal reflective structure, consisting of a bottom metal reflective surface, an intermediate dielectric spacer layer, and a top anisotropic metaatomic layer. The top metaatomic layer is composed of various periodically arranged metaatoms. By superimposing the propagation phase and geometric phase, phase decoupling between left-handed circular polarization (LCP) and right-handed circular polarization (RCP) is achieved, allowing independent control of their phase delays. Precise customization of the output linear polarization direction is achieved by adjusting the phase difference between the two. This invention breaks the lock-in relationship between geometric phase and spin state in existing metasurface holographic devices, achieving highly integrated, high-quality polarization-customized holographic imaging. It exhibits stable performance over a wide spectral range and large incident angles, and can be widely applied in optical encryption, secure displays, and optical communications.

Embodiments of the present application relate to the technical field of antennas, and provide a terminal antenna and an electronic device. The solution enables circularly polarized wide-angle radiation over the upper hemispherical spatial domain above the electronic device. The terminal antenna comprises: a first radiator and a reference ground. The projection of the first radiator onto a first plane where the reference ground is located is a first projection. The first projection is comprised within the projection of the reference ground onto the first plane. The first radiator is provided with a feed point and a grounding structure. The first radiator is electrically connected to the reference ground by means of the grounding structure. When the first radiator is operating, an annular magnetic current is distributed between the first radiator and the reference ground. A first current is distributed on a first edge of the reference ground, and the phase of the first current is different from the phase of the annular magnetic current.