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2534 results about "Circular polarization" patented technology
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In electrodynamics, circular polarization of an electromagnetic wave is a polarization state in which, at each point, the electric field of the wave has a constant magnitude but its direction rotates at a constant rate in a plane perpendicular to the direction of the wave.
Hybrid-mode horn antenna with selective gain
ActiveUS6992639B1Designing can be facilitatedMechanically simpleWaveguide hornsHorn antennaMixed mode
The present invention provides a new class of hybrid-mode horn antennas. The present invention facilitates the design of boundary conditions between soft and hard, supporting modes under balanced hybrid condition with uniform as well as tapered aperture distribution. In one embodiment, the horn antenna (100) is relatively simple mechanically, has a reasonably large bandwidth, supports linear as well as circular polarization, and is designed for a wide range of aperture sizes.
Owner:LOCKHEED MARTIN CORP
Wideband circularly polarized hybrid dielectric resonator antenna
ActiveUS8928544B2High bandwidthCompact geometryAntenna supports/mountingsAntennas earthing switches associationDielectric resonator antennaPhase difference
The present invention provides a dielectric resonator antenna comprising: a dielectric resonator; a ground plane, operatively coupled with the dielectric resonator, the ground plane having four slots; and a substrate, operatively coupled to the ground plane, having a feeding network consisting of four microstrip lines; wherein the four slots are constructed and geometrically arranged to ensure proper circular polarization and coupling to the dielectric resonator; and wherein the antenna feeding network combines the four microstrip lines with a 90 degree phase difference to generate circular polarization over a wide frequency band.
Owner:HER MAJESTY THE QUEEN AS REPRESENTED BY THE MINIST OF NAT DEFENCE OF HER MAJESTYS CANADIAN GOVERNMENT
Microstrip antenna
InactiveUS7994999B2FlexibilityImproving Impedance MatchingAntenna arraysSimultaneous aerial operationsDual frequencyCapacitance
A microstrip antenna that can be linear, co-circular, or dual-circularly polarized having co-planar radiating elements and operating at dual frequency bands wherein an inner radiating element is surrounded by and spaced from an outer radiating element. Each radiating element resonates at a different frequency. In one embodiment of the invention a feed network has a single, cross-shaped, feed line that is positioned between the inner and outer radiating elements and capacitively coupled to the inner and outer radiating elements. In another embodiment of the present invention, the radiating elements are fed separately by first and second feed networks each having a plurality of feed points. The radiating elements each have one active feed point that is either directly or indirectly coupled to its respective feed network.
Owner:HARADA IND OF AMERICA
Circular-polarization dipole helical antenna
InactiveUS20060232493A1Quick fine-tuningReduce lossRadiating elements structural formsHelical antennasElectrical conductorPhase difference
A circular-polarization dipole helical antenna is used for electronic device and satellite terminal and includes a base, and an antenna conductor arranged on surface of the base. The antenna conductor includes a plurality of metal conductors with high Q value and anti-oxidation property and continuously and helically coated on surface of the base. The base is made of low loss and high dielectric constant material. An unbalance-to-balance circuit module connects two signal-feeding ends to the base with phase difference of 180 degree. The problems of narrow bandwidth, low efficiency, complicated structure and precise manufacture can be solved.
Owner:CIREX TECH CORP
Substrate Integrated Waveguide Antenna Array
InactiveUS20090066597A1Reduce the overall heightMeet cutting requirementsLinear waveguide fed arraysWaveguidesMobile antennasDielectric substrate
A substrate integrated waveguide (SIW) slot full-array antenna fabricated employing printed circuit board technology. The SIW slot full-array antenna using either single or multi-layer structures greatly reduces the overall height and physical steering requirements of a mobile antenna when compared to a conventional metallic waveguide slot array antenna. The SIW slot full-array antenna is fabricated using a low-loss dielectric substrate with top and bottom metal plating. An array of radiating cross-slots is etched in to the top plating to produce circular polarization at a selected tilt-angle. Lines of spaced-apart, metal-lined vias form the sidewalls of the waveguides and feeding network. In multi-layer structures, the adjoining layers are coupled by transverse slots at the interface of the two layers.
Owner:UNIV OF TENNESSEE RES FOUND
Substrate integrated waveguide antenna array
InactiveUS7808439B2Reduce the overall heightMeet cutting requirementsLinear waveguide fed arraysWaveguidesMobile antennasDielectric substrate
Owner:UNIV OF TENNESSEE RES FOUND
Low cost antenna design for wireless communications
ActiveUS20080284661A1Simultaneous aerial operationsRadiating elements structural formsAntenna designGround plane
A low cost and multi-featured antenna is disclosed. The antenna employs a radiating element mounted to a ground plane and having first and second branches spaced above the ground plane forming a generally L shaped planar radiating structure. The antenna can be either linear or circular polarization, and can be either single band or dual band, and only one feeding port is needed to obtain circular polarization. The antenna can be easily applied to various frequency bands.
Owner:INTEL CORP
Two-panel liquid crystal system with circular polarization and polarizer glasses suitable for three dimensional imaging
InactiveUS20070035830A1Easy to adaptEasy to separateCathode-ray tube indicatorsSteroscopic systemsLiquid-crystal displayPolarizer
Disclosed herein are systems and methods for three dimensional display that produce stereo images (left and right eye images) each having particular known polarization so that they can be segregated and viewed with suitable polarizer eyeglasses to create the perception in the human mind of a three-dimensional image. According to one or more embodiments, two liquid crystal panels are utilized with the two panels being stacked one in front of the other relative to a light source and two polarizers are used surrounding the panel closest to the light source. In alternative embodiments, that panel and polarizers comprise a typical liquid crystal display (“LCD”) monitor. In preferred embodiments, images produced by the system are then circularly polarized for decoding by eyeglasses having corresponding circularly polarized lenses.
Owner:VIRRILLI JAMES
Liquid crystal geometrical phase optical elements and a system for generating and rapidly switching helical modes of an electromagnetic wave, based on these optical elements
InactiveUS8264623B2Easy to controlUniform and very small thicknessNon-linear opticsOptical radiationWavefront
Owner:CONSIGLIO NAT DELLE RICERCHE
L-waveband broadband circular polarization micro-strip antenna
InactiveCN103490151ABroadened circular polarization bandwidthImproving Impedance BandwidthRadiating elements structural formsAntennas earthing switches associationDielectric substrateNavigation system
The invention discloses an L-waveband broadband circular polarization micro-strip antenna which comprises an upper-layer radiating antenna dielectric substrate and a lower-layer feed network dielectric substrate; a radiation patch is printed on the upper surface of the upper-layer radiating antenna dielectric substrate; four coupling patches are printed on the lower surface of the upper-layer radiating antenna dielectric substrate; an earth plate is arranged on the upper surface of the lower-layer feed network dielectric substrate, and a micro-strip power dividing phase-shifting feed network with one input end and four output ends is printed on the lower surface of the lower-layer feed network dielectric substrate; an air gap is formed between the upper-layer radiating antenna dielectric substrate and the lower-layer feed network dielectric substrate; each coupling patch is connected with one output end of the micro-strip power dividing phase-shifting feed network through a metal probe. The L-waveband broadband circular polarization micro-strip antenna is simple in structure, low in cost, easy to tune, wide in impedance bandwidth and circular polarization bandwidth and suitable for application to a maritime satellite communication system and a satellite positioning navigation system terminal.
Owner:DALIAN MARITIME UNIVERSITY
3D stereo OLED display
ActiveUS7221332B2Effectively produce and alter handednessLarge color gamutStatic indicating devicesSolid-state devices3d imageDisplay device
A switchable stereoscopic display system, wherein the switchable stereoscopic display system can display two-dimensional and three-dimensional images, includes: an organic light emitting diode (OLED) display device; Electronics that rapidly updates individual OLEDs; and a linearly polarizer for the OLED display device. Additionally, a circular polarizing layer changes light from linearly polarized light to circular polarized light. A polarization layer, on top of the circular polarization layer, switches a polarization direction of emitted light within the OLED display device. Other electronics switches the polarization direction within independent segments of the polarization layer. Refreshed OLEDs are synched with the independent segments of the polarization layer.
Owner:GLOBAL OLED TECH
Wideband circularly polarized hybrid dielectric resonator antenna
ActiveUS20120212386A1High bandwidthCompact geometryPolarised antenna unit combinationsAntennas earthing switches associationDielectric resonator antennaPhase difference
The present invention provides a dielectric resonator antenna comprising: a dielectric resonator; a ground plane, operatively coupled with the dielectric resonator, the ground plane having four slots; and a substrate, operatively coupled to the ground plane, having a feeding network consisting of four microstrip lines; wherein the four slots are constructed and geometrically arranged to ensure proper circular polarization and coupling to the dielectric resonator; and wherein the antenna feeding network combines the four microstrip lines with a 90 degree phase difference to generate circular polarization over a wide frequency band.
Owner:HER MAJESTY THE QUEEN AS REPRESENTED BY THE MINIST OF NAT DEFENCE OF HER MAJESTYS CANADIAN GOVERNMENT
Satellite communications systems and methods using diverse polarizations
InactiveUS20060189274A1Active radio relay systemsWireless commuication servicesTelecommunicationsSatellite Telecommunications
Communications occur between a satellite and respective first and second classes of terminals using substantially different polarizations. The first class of terminals may include fixed and / or vehicle-based terminals, and the second class of terminals may include handheld terminals. The second class of terminals may include terminals configured to preferentially receive and / or transmit linearly polarized signals, for example, terminals with substantially linearly polarized antennas, and the first class of terminals may include terminals configured to preferentially receive and / or transmit circularly polarized signals, for example, terminals with patch and / or helical antennas configured to transmit and / or receive substantially circularly polarized signals.
Owner:ATC TECH LLC
Low return loss rugged RFID antenna
ActiveUS20070096919A1Readily apparentMemory record carrier reading problemsLifting devicesHybrid couplerEngineering
Methods, systems, and apparatuses for RFID devices, such as reader antennas, are described. A reader antenna includes a quadrature hybrid coupler, a termination element, and an antenna, such as a patch antenna. The quadrature hybrid coupler has first, second, third, and fourth ports. The first port receives an input radio frequency RF signal. The second port outputs a first RF output signal. The third port outputs a second RF output signal. The second RF output signal is shifted in phase by 90 degrees relative to the first RF output signal. The fourth port is coupled to the termination element. The patch antenna has a first point coupled to the first RF output signal and a second point coupled to the second RF output signal. The patch antenna radiates a circularly polarized RF signal due to the received first and second RF output signals. The circularly polarized RF signal may be used to interrogate tags. Furthermore, the reader antenna is integrated into a ruggedized structure that provides environmental protection for the antenna, including providing shock absorption for impacts to the antenna.
Owner:SYMBOL TECH LLC
Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles
ActiveUS20100200649A1High durability/stabilityEasy to distinguishPaper-money testing devicesRecord carriers used with machinesComputer scienceAuthentication
Optical identification and / or authentication of a document or item with the help of a marking comprising a random distribution of circular polarized light reflecting particles, the marking being applied to the document or item through an ink, and the reading device exploiting circular polarization to discriminate the flakes from the background.
Owner:SICPA HLDG SA
Wireless Energy Transfer for Misaligned Resonators
InactiveUS20140197691A1Reduce couplingEnhanced couplingTransformersTransformers/inductances circuitsEnergy transferCoupling
A system for transferring energy wirelessly includes a source for generating a circular polarized field in response to receiving the energy and a sink strongly coupled to the source for receiving the energy wirelessly via a resonant coupling of the field.
Owner:MITSUBISHI ELECTRIC RES LAB INC
OLED display device having touch sensor and method of manufacturing the same
ActiveUS20140152912A1Reduce manufacturing costReduce thicknessSolid-state devicesSemiconductor/solid-state device manufacturingDisplay deviceComputer science
An OLED display device having a touch sensor is provided. The touch sensor includes a base layer; a plurality of first touch electrodes arranged in a first direction on a first surface of the base layer; a plurality of second touch electrodes arranged in a second direction crossing the first direction on a second surface of the base layer; a plurality of first routing wires connected to the first touch electrodes on the first surface of the base layer, respectively; a plurality of second routing wires separated from the plurality of first routing wires and formed on the first surface of the base layer; and a plurality of third routing wires connected to the second routing wires respectively via holes, and formed on the second surface of the base layer. The base layer is one of a barrier layer, an anti-scratch layer, and a circular polarization layer.
Owner:LG DISPLAY CO LTD
Achromatic retarder array for polarization imaging
In addition to having color, light waves have the attribute of polarization. An apparatus and method to convert circular polarized light into linearly polarized light over a wide range of wavelengths is provided by utilizing a first surface-relief grating functioning as a quarter-wave waveplate and a second surface-relief grating functioning as a half-wave waveplate. A plurality of such devices are arranged in a two-dimensional array and combined with an array of linear polarizers and an array of photodetectors to form a polarization imaging sensor. Such a sensor could have applications in automobiles to alert drivers of the presence of other vehicles, especially at night, in fog, or in rain. Military applications include the detection of vehicles placed among trees and shrubs. Another advantage of using circular polarization images is that the sign and magnitude of the circular polarization can potentially be used to reveal the spatial orientation, material, and surface roughness of the object's surface.
Owner:CHUN CORNELL SEU LUN
Microstrip antenna
InactiveUS20090140927A1FlexibilityImproving Impedance MatchingAntenna arraysSimultaneous aerial operationsCapacitanceDual frequency
A microstrip antenna that can be linear, co-circular, or dual-circularly polarized having co-planar radiating elements and operating at dual frequency bands wherein an inner radiating element is surrounded by and spaced from an outer radiating element. Each radiating element resonates at a different frequency. In one embodiment of the invention a feed network has a single, cross-shaped, feed line that is positioned between the inner and outer radiating elements and capacitively coupled to the inner and outer radiating elements. In another embodiment of the present invention, the radiating elements are fed separately by first and second feed networks each having a plurality of feed points. The radiating elements each have one active feed point that is either directly or indirectly coupled to its respective feed network.
Owner:HARADA IND OF AMERICA
Single layer dual band antenna with circular polarization and single feed point
InactiveUS20090153404A1Simple structureWide bandwidthSimultaneous aerial operationsRadiating elements structural formsElectromagnetic couplingDual band antenna
A single-layer dual-band antenna with circular polarization is disclosed. The antenna includes a first radiator formed on the top surface of a substrate and electrically coupled to a feeding element, and a second radiator formed on the top surface of the substrate, spaced apart from the first radiator by a predetermined distance and electromagnetically coupled with the first radiator. The antenna is thin because it has a single-layer structure. Furthermore, there is no deterioration in the radiation characteristic due to interference between the radiators. Moreover, impedances of the radiators can be independently matched at their frequency bands by adjusting the position of a feed point and the relative position of the radiators.
Owner:E M W ANTENNA CO LTD
Broadband polarized antenna including magnetodielectric material, isoimpedance loading, and associated methods
ActiveUS20070188397A1Loop antennas with ferromagnetic coreProtective material radiating elementsMiniaturizationBandwidth limitation
The broadband small antenna has equal magnetic electric proportions, circular polarization, and an isoimpedance magnetodielectric (μr≡εr) shell for controlled wave expansion. The shell is a radome without bandwidth limitation, with reflectionless boundary conditions to free space, providing loading and broad bandwidth antenna size miniaturization. The system is spherically structured based upon size, quality (Q) and bandwidth.
Owner:HARRIS CORP
Communication system and receiver
ActiveUS20110221779A1Television system detailsCathode-ray tube indicatorsCommunications systemComputer graphics (images)
A transmitter that outputs an image signal for displaying a first image and outputs an image signal of a synthesized image made of the reversal image of the first image and a second image. A display apparatus, based on the image signals output from the transmitter, displays the first image and the synthesized image with circular polarizations having different senses of rotation from each other. A receiver includes a circular polarization selecting and transmitting means that separates the first image and the synthesized image displayed on the display apparatus, based on the sense of rotation of the circular polarization, and selectively allows the images to pass therethrough, so as to be able to photograph the first image displayed on the display apparatus.
Owner:NEC CORP
Diffraction gratings formed by metasurfaces having differently oriented nanobeams
ActiveUS20180231702A1Mechanical apparatusHolographic light sources/light beam propertiesWaveguideCircular polarization
Metasurfaces provide compact optical elements in head-mounted display systems to, e.g., incouple light into or outcouple light out of a waveguide. The metasurfaces may be formed by a plurality of repeating unit cells, each unit cell comprising two sets or more of nanobeams elongated in crossing directions: one or more first nanobeams elongated in a first direction and a plurality of second nanobeams elongated in a second direction. As seen in a top-down view, the first direction may be along a y-axis, and the second direction may be along an x-axis. The unit cells may have a periodicity in the range of 10 nm to 1 μm, including 10 nm to 500 nm or 300 nm to 500 nm. Advantageously, the metasurfaces provide diffraction of light with high diffraction angles and high diffraction efficiencies over a broad range of incident angles and for incident light with circular polarization.
Owner:MAGIC LEAP INC
Antenna system and method to transmit cross-polarized signals from a common radiator with low mutual coupling
InactiveUS20070254587A1Eliminate couplingResonant long antennasAntenna supports/mountingsRadio broadcastingCoupling
A dual-port IBOC® antenna provides omnidirectional radiation of orthogonal, circularly polarized analog (FM) and digital (OFDM) signals using quadruple coplanar square loops driven from a hybrid having balanced outputs. The loops are arranged in a tiled square, with proximal sides functioning as further stripline hybrids to cancel cross coupling between the loops. Each loop quad is reflector-backed and emits a directional signal; multiple loop quads oriented radially form an omni bay. Vertical spacing between bays includes a minimum position for mutual coupling, while symmetry establishes uniform input impedance on the hybrid input ports. Tuning barbs on the loops fine tune frequency response. Bandwidth is wide, so that a single antenna can radiate multiple FM analog and hybrid IBOC® channels over the VHF FM radio broadcast band.
Owner:SPX CORP
System and method for duplex operation using a hybrid element
InactiveUS20060087385A1Polarised antenna unit combinationsCoupling devicesPhase shiftedHybrid coupler
A system for duplex transmission and reception utilizing circular polarization wherein a pair of linear polarized orthogonal antennas is coupled to a transmitter through a hybrid coupler and a receiver is coupled to the antennas via the same hybrid coupler by using the port isolated from the transmitter. The hybrid may be a quadrature hybrid coupler or may comprise a 180 degree hybrid combined with a 90 degree phase shift network. Embodiments are shown for receiving a first reflection (opposite handed sense) circular polarized wave and alternatively, for receiving a second reflection (same handed sense) (multi-path) circular polarized wave.
Owner:TIME DOMAIN
Low cost antenna design for wireless communications
Owner:INTEL CORP
Polarization light splitting film, backlight system and liquid crystal display
A polarization light splitting film having a light receiving side and a light transmitting side. The polarization light splitting film includes an optical rotation selection layer at the light receiving side for reflecting one of right and left circularly polarized components of a light beam that is incident on the light receiving side and for transmitting the other one of the right and left circular polarization components of the light beam, and a quarter-wave layer laminated over the optical rotation selection layer at the light transmitting side.
Owner:DAI NIPPON PRINTING CO LTD
Circularly-polarized tuning modulator based on tunable metasurface and design method thereof
ActiveCN105161858AFast dynamic modulationSame rate of changeAntenna earthingsAntennas earthing switches associationDielectric plateResonance
The invention belongs to the technical field of reflection systems, and specifically relates to a circularly-polarized tuning modulator based on a tunable metasurface and a design method thereof. The circularly-polarized tuning modulator is mainly composed of an upper microstrip conduction band layer, a middle dielectric plate and a lower metal grounding plate. The upper microstrip conduction band layer is an electric brush structure and is mainly composed of a circular electric resonance (ELC) structure, a bias circuit and a PIN diode. The circular electric resonance (ELC) structure is composed of an upper semicircular arm, a lower semicircular arm, an arc intermediate opening, central vertical arms and intervals. By controlling the on-off state of the PIN diode, the switching from a turning transition function to a turning maintenance function and the switching from a turning hybridization function to the turning maintenance function are realized for the circularly-polarized tuning modulator. According to the invention, two or more function devices are integrated on one plate, the manufacturing cost is lowered, the efficiency and the reusability are improved, the circularly-polarized tuning modulator is realized without a multi-layer torsion chiral structure, and the circularly-polarized tuning modulator is simple in structure, small in size, low in loss, wide in frequency band and light in weight.
Owner:FUDAN UNIV
Process for manufacturing high gain dual-linear polarization or dual-circle polarization waveguide array antennas
ActiveCN101083359AFix compatibility issuesResolve mutual interferencePolarised antenna unit combinationsResonant cavityManufacturing technology
The invention publishes a wave guide array antennas manufacture method of high gain crewel polarized or the double circular polarized, which relates to a wave guide array antennas manufacture technique in the correspondence broadcast and measure-control domain. The invention has designed the radiation level, the horizontal polarization or the circular polarization feed wave guide level, the perpendicular polarization feed wave guide level, the perpendicular polarization feed wave guide lap, the feed way of using the square or the circular waveguide resonant cavity, has solved the receive and launch of the double polarized electromagnetism signal; The horizontal polarization uses the coupling feed way and the perpendicular polarization uses the direct feed way, completes the separation of the two polarized components, simultaneously may realizes the double circular polarized work. The invention has the double polarized radiation, the high feed efficiency, compact structure, low processing cost and so on merits, is specially suitable for the manufacture of each kind of satellite communication or single control station antenna which works in the double thread polarization or double circular polarized application situations.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
3D stereo OLED display
ActiveUS20050151152A1Large color gamutLarge viewing angleSolid-state devicesSemiconductor/solid-state device manufacturingDisplay devicePolarizer
A switchable stereoscopic display system, wherein the switchable stereoscopic display system can display two-dimensional and three-dimensional images, includes: an organic light emitting diode (OLED) display device; Electronics that rapidly updates individual OLEDs; and a linearly polarizer for the OLED display device. Additionally, a circular polarizing layer changes light from linearly polarized light to circular polarized light. A polarization layer, on top of the circular polarization layer, switches a polarization direction of emitted light within the OLED display device. Other electronics switches the polarization direction within independent segments of the polarization layer. Refreshed OLEDs are synched with the independent segments of the polarization layer.
Owner:GLOBAL OLED TECH
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