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76results about How to "Increased Polarization Purity" patented technology
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Wideband phased array radiator
InactiveUS7180457B2Increased Polarization PurityLow mismatch lossIndividually energised antenna arraysSlot antennasEngineeringRadio frequency
Owner:RAYTHEON CO
Wideband phased array radiator
ActiveUS20050007286A1Increased Polarization PurityLow mismatch lossIndividually energised antenna arraysSlot antennasEngineeringRadio frequency
A radiator element includes a pair of substrates each having a transition section and a feed surface, each of the substrates is spaced apart from one another. The radiator element further includes a balanced symmetrical feed having a pair of radio frequency (RF) feed lines disposed adjacent to and electromagnetically coupled to the feed surface of one of a corresponding one of the pair of transition sections, and the pair of radio frequency feed lines forms a signal null point adjacent the transition sections.
Owner:RAYTHEON CO
Common optical-path testing of high-numerical-aperture wavefronts
ActiveUS20050046863A1Improve polarizationIncreased Polarization PurityOptical measurementsInterferometersWavefrontPhase shifted
A polarizing point-diffraction plate is used to produce common-path test and reference wavefronts with mutually orthogonal polarizations from an input wavefront. The common-path test and reference wavefronts are collimated, phase shifted and interfered, and the resulting interferograms are imaged on a detector. The interference patterns are then processed using conventional algorithms to characterize the input light wavefront.
Owner:ONTO INNOVATION INC
Dual polarization wireless repeater including antenna elements with balanced and quasi-balanced feeds
InactiveUS20060205341A1Feedback suppression be improveImprove polarization purityTransmission systemsActive radio relay systemsCross polarizationEngineering
Wireless repeaters that utilize balanced and quasi-balanced antenna feed circuits for feedback suppression. The wireless repeater typically implements dual cross-polarization isolation both along and between uplink and downlink signal paths, which relies on dual-polarization server and donor antennas. The unit may utilize balanced antenna feeds for both polarizations or balanced antenna feeds for one polarization and unbalanced antenna feeds for the other polarization. In addition, the unbalanced antenna feeds may be deployed in a two-element quasi-balanced configuration, and the antenna may include dual-polarization antenna element. The antenna elements may include dual-polarization antenna elements or separate antenna elements for each polarization.
Owner:ANDREW LLC
Single pulse wide angle electric scanning reflective array antenna
ActiveCN102593589ACompact structureImprove structural performanceAntennasRadar systemsOptoelectronics
The invention discloses a single pulse wide angle electric scanning reflective array antenna comprising a reconfigurable reflective array surface (1), a polarization grid (2), a bias voltage circuit (3), a wave control machine (4), a control processor (5) and a feed source subsystem (6). The size of the caliber of the polarization grid (2) is equal to that of the caliber of the reconfigurable reflective array surface (1), and the polarization grid (2) is positioned above the reconfigurable reflective array surface (1). A radiation aperture surface of a feed source (61) is parallel and level to the reconfigurable reflective array surface (1) and is positioned at the center of the reflective array surface. The single pulse wide angle electric scanning reflective array antenna adopts a spatial feed mode, that is to say, the feed source irradiates the polarization grid and feeds the array surface after reflection. A polarization grid structure is applied to a reconfigurable reflective array antenna, and the feed source, the polarization grid and the reflective array surface form a double reflective structure, therefore, the performance of an antenna structure is excellent, the antenna structure can facilitate the installation of an antenna port and the connection of the antenna port and a radar system, and the antenna is compact in structure with a low section.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Dual-polarization strong-coupling ultra-wideband phased-array antenna loaded with electromagnetic metamaterial
ActiveCN110323575AEnhanced couplingReduce weightParticular array feeding systemsRadiating elements structural formsUltra-widebandTransition line
The invention discloses a dual-polarization strong-coupling ultra-wideband phased-array antenna loaded with an electromagnetic metamaterial. The antenna comprises a strong-coupling folding dipole unit, a feed balun, a metamaterial wide-angle impedance matching layer, a microstrip transition line and a reflection floor, wherein the tail end of the strong-coupling folding dipole unit is slotted forfacilitating the dual-polarization design. A dipole and the designed feed balun are integrated on the same dielectric substrate, and the bottom of the dipole and the bottom of the designed feed balunare vertically embedded in the reflection floor; the wide-angle impedance matching layer is arranged at the top of the strong-coupling dipole unit, and the lower part completes the coaxial electric connection with the balun by bending the microstrip transition line, thereby achieving the impedance matching effect at the same time. The dual-polarization characteristic is achieved through the careful design of the tail end of the dipole, and a strong coupling folded dipole form is introduced; a novel wide-angle impedance matching layer structure is loaded to achieve the physical characteristicsof low profile and light weight and the excellent radiation performance of ultra wide band, low cross polarization and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
High isolation dual-polarized microstrip antenna fed by slot
ActiveCN101950859AImproved Polarization Current LinearityIncreased Polarization PurityRadiating elements structural formsPolarised antenna unit combinationsMicrostrip antennaEngineering
The invention discloses a high isolation dual-polarized microstrip antenna fed by slot, which comprises a first-layer medium plate, a second-layer medium plate and a third-layer medium plate, wherein the second-layer medium plate and the third-layer medium plate are arranged below the first-layer medium plate, and the lower surface of the first-layer medium plate is provided with radiation stickers; the second-layer medium plate and the third-layer medium plate are fixedly connected to form a whole by a public metal layer, and the public metal layer is provided with a standard cross-shaped slot; the upper surface of the second-layer medium plate and the lower surface of the third-layer medium plate are respectively provided with a first feeding structure and a second feeding structure, and the symmetry axes, which are projected on the public metal layer, of the first feeding structure and the second feeding structure coincide with the symmetry axis of the horizontal slot along the length direction and the symmetry axis of the vertical slot along the length direction. The dual-polarized antenna of the invention can greatly improve the isolation between two orthogonal polarized fields of the dual-polarized antenna, and has extensive applicability and flexibility.
Owner:SOUTHEAST UNIV
Common optical-path testing of high-numerical-aperture wavefronts
ActiveUS7057737B2Improve polarizationIncreased Polarization PurityOptical measurementsInterferometersWavefrontPhase shifted
Owner:ONTO INNOVATION INC
Broadband dual-polarized antenna unit
ActiveCN102074779AWide impedanceFeature wideAntenna supports/mountingsRadiating elements structural formsIntegrated designBroadband
The invention discloses a broadband dual-polarized antenna unit, which is used for realizing broader band characteristic. A radiating element comprises a reflective plate, a main radiating body, an upper insulating block, a lower insulating block and a balance feed device, wherein the main radiating body comprises a support body and radiating pieces; four radiating pieces and the support body form a whole, and the four radiating pieces respectively form an angle of 90 degrees with the support body; the outline of each radiating piece has a 90-degree fan shape; each radiating piece is provided with a hollowed structure and a loading section used for broadening the bandwidth and improving polarization purity; a clearance between two adjacent radiating pieces is less than 0.1 wavelength; and the radiating element adopts coupling balance feed and an integrated design that four support body bottoms are mutually short-circuited, and is fixed on the reflective plate. The broadband dual-polarized antenna unit has impedance bandwidth of over 45 percent, and has the advantages of small size, simple structure, a few components, convenience for assembly, easy production, low cost and the like.
Owner:TONGYU COMM INC
Active ring resonator-based single longitudinal mode low noise narrow band column vector fiber laser
InactiveCN106253039AIncreased Polarization PurityStable output powerActive medium shape and constructionLow noiseGrating
The invention discloses an active ring resonator-based single longitudinal mode low noise narrow band column vector fiber laser. The single longitudinal mode low noise narrow band column vector fiber laser comprises a pumping source, a wavelength division multiplexer, a gain fiber, an isolator, a coupler, a seed source, a first optical circulator, a second optical circulator, a single-mode fiber, a few-mode fiber engraved with a grating, a first polarization controller and a second polarization controller which are connected with one another in a closed end-to-end manner through a fiber coupling way to form a ring optical fiber resonator. The components of the single longitudinal mode low noise narrow band column vector fiber laser adopts an all-fiber coupling mode; the structure is compact, the polarization purity of output column vector laser is high, the coherence is well, a single longitudinal mode working manner is realized, and the spectrum stability is high.
Owner:NANJING UNIV OF POSTS & TELECOMM
Beamsplitter for high-power radiation
InactiveUS7049544B2Improve thermal conductivityReduce radiationPolarising elementsMountingsRefractive indexThermal effect
A beamsplitter apparatus for use with high-power radiation is disclosed. The apparatus includes a thermally conductive frame with a central aperture. The frame holds a window in the central aperture at the window's periphery. The window includes a diamond substrate with an optional coating formed thereon. Because the substrate is diamond and the frame is thermally conductive, the window is less susceptible to thermal effects caused by absorption of the incident radiation by the window. Thus, the original flatness of the widow surfaces is preserved, and variations in its index of refraction will be minimal. The result is that high-power radiation beams reflected from and transmitted by the widow remain substantially undistorted.
Owner:ULTRATECH INT INC
Dual-probe reverse phase feeding microstrip antenna
InactiveCN102637957APromote polarizationImprove featuresRadiating elements structural formsMechanical engineeringPhysics
The invention discloses a dual-probe reverse phase feeding microstrip antenna, which comprises a first medium substrate, a second medium substrate and a ground level, wherein the first medium substrate is parallel to the ground level; the second medium substrate penetrates through the ground level vertically; the upper end of the second medium substrate is adjacent to the lower surface of the first medium substrate; the first medium substrate is provided with a microstrip patch; a first L-shaped probe strip and a second L-shaped probe strip are arranged symmetrically on the second medium substrate; the first L-shaped probe strip is formed by connecting a first coupling exciting strip which is parallel to the ground level and a first feeding strip which is vertical to the ground level; the second medium substrate is partitioned into an upper area and a lower area by an intersection line between the second medium substrate and the ground level; an area of the second medium substrate, which is positioned on the lower side of the intersection line, is provided with a microstrip power divider in two penny; one path of the microstrip power divider is connected with the first feeding strip through an inverter; and the other path of the microstrip power divider is directly connected with the second feeding strip.
Owner:SOUTHEAST UNIV
Cassegrain reflector array antenna
The invention discloses a Cassegrain reflective array antenna, which comprises a waveguide feed, a main reflective surface and a sub-reflective surface, wherein the waveguide feed, the main reflectivesurface and the height difference between the sub-reflective surfaces are jointly determined by a design focal length and a mirror image principle; the antenna comprises a waveguide feed, a main reflective surface and a sub-reflective surface. The waveguide feed is used for emitting spherical waves; The main reflecting surface is used for converting the spherical wave into plane wave while polarizing and twisting 90 DEG; The sub-reflecting surface has the function of polarization filtering, that is, the sub-reflecting surface can maintain the total transmission of a linearly polarized wave while reflecting the cross-polarized wave. The Cassegrain reflective array antenna realizes 48% of 3dB gain bandwidth and 68.4% of 20dB cross polarization suppression bandwidth, and the profile is almost half of that of the reflective array antenna, thus realizing the characteristics of low profile, wide band, high gain and high polarization purity operation.
Owner:AIR FORCE UNIV PLA
Radiation structure and array antenna
ActiveCN110098477AIncreased cross-polarization rejection ratioReach profileParticular array feeding systemsRadiating elements structural formsPhysicsRadiation
The invention provides a radiation structure and an array antenna. The radiation structure comprises a radiation fin with a radiation slot in the middle. The radiation slot consists of a transverse slot and a longitudinal slot, which are communicated with each other and are cross-orthogonal. The length of the transverse slot and the length of the longitudinal slot are less than the length of the radiation fin in the extending direction of the corresponding radiation slot. By adding the radiation slot to the radiation fin, the radiation structure can produce two kinds of radiation synchronouslywhen working in an antenna system, so as to achieve an effect of polarization vector superposition enhancement. Thus, the same radiation efficiency and radiation gain of the multi-layer patch structure in the traditional antenna can be achieved by only one layer of radiation fin, fewer components are used, the structure is simple, the antenna profile can be reduced, and antenna miniaturization isfacilitated.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD
Small high-isolation dual-polarization medium resonator antenna
ActiveCN105071044AHigh Isolation Dual PolarizationEasy to integrateSimultaneous aerial operationsRadiating elements structural formsElectricityMetal sheet
The invention discloses a small high-isolation dual-polarization medium resonator antenna. The antenna comprises an antenna structure frame, a circuit board, a first load metal sheet, a second load metal sheet, and a rectangular medium resonator. The circuit board is arranged on the antenna structure frame and is provided with an H-shaped gap feed structure. The first load metal sheet is arranged on the circuit board. The second load metal sheet is arranged on the antenna structure frame and under the circuit board. The rectangular medium resonator is arranged on the circuit board. A gap is formed between the rectangular medium resonator and the first load metal sheet, and a gap is formed between the rectangular medium resonator and the first load metal sheet. The rectangular medium resonator rotates 45 DEG around the central shaft of the circuit board, so two edges of the rectangular medium resonator are in the direction parallel to the diagonal of the circuit board, thereby forming + / - 45 DEG dual polarization.
Owner:SICHUAN TAOGUANG COMM
Dual-polarization plane reflective array antenna
InactiveCN105609967AGood broadband dual polarization characteristicsIncreased Polarization PuritySimultaneous aerial operationsPolarised antenna unit combinationsOpticsPolarization plane
The invention provides a dual-polarization plane reflective array antenna. The antenna comprises a dual-polarization feed source used for emitting dual-polarization electromagnetic waves and a plane reflective plate used for focusing and modulating the incident dual-polarization electromagnetic waves, wherein the reflective plate comprises two or more than two reflective arrays; the reflective arrays form one or more phase-shifting units for performing phase shifting; and the plane reflective plate has convergence capability for the dual-polarization incident electromagnetic waves within a preset angle range in the normal direction of the reflective plate.
Owner:超视距(南京)科技有限责任公司
Method and system for generating polarization state of high-order Poincare sphere with robustness
The invention discloses a method and system for generating a polarization state of a high-order Poincare sphere with robustness. The method comprises the following steps of: loading a vortex phase on a completely coherent vector light beam, and then regulating and controlling the completely coherent vector light beam into left-handed circularly polarized light and right-handed circularly polarized light of the high-order Poincare sphere; synthesizing the left-handed circularly polarized light and the right-handed circularly polarized light into vector polarized light on the high-order Poincare sphere, and generating a polarization matrix of the high-order Poincare sphere through adjustment; reducing the spatial coherence of the polarized light, obtaining a random electromagnetic beam through shaping, and extracting polarization information in a polarization matrix to a spatial correlation tensor of the random electromagnetic beam; transmitting a random electromagnetic beam to a far field, in the far field, transferring polarization information from a space correlation tensor to a polarization matrix of the random electromagnetic beam, and obtaining a high-order Poincare sphere polarization state with robust characteristics. The problems that an existing high-order Poincare spherical polarized beam is difficult to generate, does not have the robust characteristic and is easily damaged by the external environment are solved.
Owner:SUZHOU UNIV
Efficient polarization purifying device
ActiveCN103487945AHigh degree of polarizationIncreased Polarization PurityNon-linear opticsOptical elementsOptical axisHigh energy
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Low cross-polarization microstrip patch antenna
InactiveCN108879085AExcellent low cross polarizationIncreased Polarization PurityRadiating elements structural formsAntenna earthingsMicrostrip patch antennaMicrowave
The invention discloses a low cross-polarization microstrip patch antenna, comprising a microwave dielectric substrate, a rectangular metal patch, a metal floor, short-circuited metal pillars and a feeding probe, wherein the rectangular metal patch is disposed on the upper surface of the microwave dielectric substrate, and the metal floor is disposed on the lower surface of the microwave dielectric substrate; two rows of short-circuited metal pillars are arranged on the rectangular metal patch, and are respectively arranged along the edges of two non-radiative sides of the rectangular metal patch, and the short-circuited metal pillars short the rectangular metal patch and the metal floor; and the feeding probe is placed on the rectangular metal patch. The invention realizes excellent low cross polarization, improves the polarization purity of the antenna, increases the gain of the rectangular microstrip patch antenna, and has the advantages of low profile, simple structure, and simpleand convenient processing.
Owner:NANJING UNIV OF SCI & TECH
Radiation patch for microstrip antenna and microstrip antenna
ActiveCN103474756AReduce closureIncreased Polarization PurityAntenna arraysRadiating elements structural formsMiniaturizationBroadband
The invention discloses a radiation patch for a microstrip antenna and the microstrip antenna and relates to the technical field of antennas. The radiation patch for the microstrip antenna and the microstrip antenna aim at solving the problems that broadband-orientation and miniaturization of an existing microstrip antenna can not be achieved and the cross polarization rejection ratio is not ideal. Cross-shaped grooves are formed in the radiation patch for the microstrip antenna and comprise at least four long sealing grooves arranged in a cross shape. The long sealing grooves are not communicated with one another. The radiation patch for the microstrip antenna and the microstrip antenna are used for design of antennas of a mobile communication base station.
Owner:HUAWEI TECH CO LTD
Illumination optical system, exposure apparatus, and device manufacturing method
InactiveUS20090086185A1Increased Polarization PurityObtain goodPhotomechanical apparatusPhotographic printingPupilControl unit
An illumination optical system comprises a first polarization control unit which is located between a light source and a pupil of an illumination optical system, and a second polarization control unit which is located between the first polarization control unit and the pupil, wherein a region on the pupil includes a plurality of partial regions which are classified into a first group including a partial region having a largest area, and a second group including a partial region different from the partial region having the largest area, and the second polarization control unit controls a polarization state in the partial region which belongs to only the second group.
Owner:CANON KK
Ultra-wide-band microstrip patch antenna and multi-frequency antenna array
PendingCN107086363ASolve the problem of narrow standing wave bandwidthNo dispersion problemAntenna arraysRadiating elements structural formsMicrostrip patch antennaUltra-wideband
The invention relates to an ultra-wide-band microstrip patch antenna and a multi-frequency antenna array. The microstrip patch antenna comprises a metal reflective plate and a radiation patch apparatus above the metal reflective plate; a metal patch and two gaps with opening slots in a first straight line direction are arranged on a microstrip patch layer; the opening slots of the gaps in the first straight line direction are opposite in directions; a feed network layer comprises a first feed input port, a first power division node, a first feeder line, a second feeder line and a third feeder line; one end of the first feeder line is connected with the first feed input port while the other end is connected with the input end of the first power division node; and the fixed ends of the second feeder line and the third feeder line are connected with the output end of the first power division node separately while the free ends extend towards the same side of the two gaps in the first straight line direction separately to cross over the two gaps in the first straight line direction respectively. By virtue of the technical scheme provided by the invention, the problems of antenna feed chromatic dispersion, poor directional diagram cross polarization and cross coupling of different frequencies in a multi-frequency antenna can be solved.
Owner:ANPULUO SUZHOU COMM TECH CO LTD
Single reflecting surface compact range device of high cross polarization isolation
PendingCN107727946ACompact structureEasy to manufactureAntenna radiation diagramsCompact rangeEngineering
The invention discloses a single reflecting surface compact range device of high cross polarization isolation. The device is mainly composed of a reflecting surface of a single reflecting surface compact range, a feed source and a polarization grid. The feed source illuminates the precise reflecting surface of the single reflecting surface compact range and beforehand collimates and corrects spherical waves into planar waves. To lower shielding of the feed source, an offset feed structure is adopted in geometric layout, while the offset feed layout is the main reason of large cross polarization. The polarization grid is arranged in front of a planar wave silent area of the single reflecting surface compact range, and a silent area range is subjected to polarization filtering and gating, wherein the polarization states of the feed source and the polarization grid are controlled by respective controllers. Polarization and gating of the polarization grid have the advantages of wideband working, can almost completely reflect the polarization component parallel to polarization grid silk, almost completely transmit the polarization component perpendicular to the polarization grid silk and improve the polarization isolation of the single reflecting surface compact range to a great extent with the cost of introducing very small insertion loss. The engineering achievability of compact range system design is improved, and control over the dynamic range of a radio frequency system is improved.
Owner:BEIHANG UNIV
Wideband high-isolation low-cross polarization dual polarization antenna
ActiveCN107591610AImprove isolationHigh gain characteristicAntenna arraysRadiating elements structural formsCommunications systemCoupling
The invention belongs to the field of millimeter wave antennas and provides a wideband high-isolation low-cross polarization dual polarization antenna, which is applicable to a terahertz-band wirelessfull-duplex communication system. The wideband high-isolation low-cross polarization dual polarization antenna comprises a wideband sub array feed network and a dual polarization sub array unit antenna, wherein the dual polarization sub array unit antenna comprises a polarization one feed structure, a polarization two feed structure, a polarization isolation structure, a sub array power divisionstructure and a radiation unit; the polarization one feed structure and the polarization two feed structure are connected with the polarization isolation structure and the excitation modes of the twoare orthogonal; the sub array power division structure is arranged on the polarization isolation structure and is composed of a power division coupling cavity and a coupling gap arranged on the uppersurface of the power division coupling cavity, and the coupling gap is connected with the radiation unit through a matching structure. According to the wideband high-isolation low-cross polarization dual polarization antenna provided by the invention, wideband high-efficiency high-gain features can be realized, the dual polarization input port has high isolation (larger than 60 dB), and the dual polarization has high polarization purity (larger than 50 dB).
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Meander-line circular polarization grid of any incidence angle
InactiveCN106935943AReduce lossGuaranteed circular polarization effectWaveguide type devicesMeanderLower upper
The invention provides a meander-line circular polarization grid of any incidence angle, and aims at providing the circular polarization grid of low loss, high circular polarization purity and capable of satisfying any incidence angle. Meander-line metal grids arranged according to periods are prepared on upper, inner and lower metal grid layers respectively, adjacent metal grids are separated via air slots whose width is the same with that of the metal grids respectively, the inner metal grid layer is prepared between upper and lower foam medium layers; the upper foam medium layer is adhered to the upper metal grid layer, the lower upper foam medium layer is adhered to the inner metal grid layer, and the lower metal grid layer is adhered to the lower foam medium layer; and an electric field is polarized horizontally, the included angle between a vector direction of the electric field and a meander metal grid is 45 degree, and after polarization change by the meander-line metal grids of the upper, inner and lower metal grid layers, and linearly polarized waves can be converted to left-hand and right-hand circular polarization waves.
Owner:10TH RES INST OF CETC
Small broadband differential excitation dual-mode and dual-polarized base station antenna
ActiveCN110112562ASteady Directed RadiationImprove isolationRadiating elements structural formsAntennas earthing switches associationDual modeDielectric plate
The invention belongs to the field of wireless communication, and particularly relates to a small broadband differential excitation dual-mode and dual-polarized base station antenna in this field. Theantenna comprises a first dielectric plate, a second dielectric plate a third dielectric plate, a reflection plate, a coaxial connector, a radiation patch, a driving branch and baluns. The first dielectric plate is horizontally arranged at the uppermost layer of the whole antenna; the reflection plate is horizontally arranged at the lowest layer of the whole antenna; the pair of mutually orthogonal baluns are arranged between the first dielectric plate and the second dielectric plate, and the first dielectric plate and the reflection plates are respectively perpendicular to the baluns up anddown; the orthogonal surfaces of the orthogonal baluns are respectively printed with the second dielectric plate and the third dielectric plate to allow the second dielectric plate and the third dielectric plate to be mutually perpendicular to the first dielectric plate and the reflection plate. The small broadband differential excitation dual-mode and dual-polarized base station antenna ensuresthe miniaturization while ensuring the broadband.
Owner:XIDIAN UNIV
Dual-polarization printed slot antenna with compact structure
InactiveCN108258433AImprove isolation characteristicsIncreased Polarization PurityRadiating elements structural formsAntennas earthing switches associationElectrical conductorDielectric substrate
The invention discloses a dual-polarization printed slot antenna with a compact structure, which belongs to the technical field of antennas. The dual-polarization printed slot antenna with a compact structure is composed of a rectangular dielectric substrate and a metal good conductor layer applied to the upper surface, wherein a horizontal rectangular slot arm, a first vertical rectangular slot arm, a second vertical rectangular slot arm, a first long strip-shaped slot and a second long strip-shaped slot are etched on the upper surface of the metal good conductor layer, and the etching depthis equal to the thickness of the metal good conductor layer; the median of the narrow side of the horizontal rectangular slot arm is coincident with that of the long side of the rectangular dielectricsubstrate, and one narrow side of the horizontal rectangular slot arm is coincident with the long side of the rectangular dielectric substrate. Two ports of the antenna have high isolation characteristics, and in a working band, the port isolation is greater than 27dB; the radiation field of the antenna with two ports also has high polarization purity and can reach 34 dB; and the antenna is suitable for small base station MIMO systems such as a narrow block or a tunnel.
Owner:JILIN UNIV
High-gain wideband omnidirectional antenna
InactiveCN101958463BHigh gainIncreased Polarization PurityAntenna arraysAntenna supports/mountingsVertical planeAntenna gain
The invention provides a high-gain wideband omnidirectional antenna, which comprises a main feeder, a two-cone shaped reflector, a wideband slot antenna, a feed network and an antenna cover. The high-gain wideband omnidirectional antenna has the characteristics of: 1, bandwidth of over 110 percent, higher radiation efficiency, adoption of inconsistent slot line shaped curves and contribution to further widening the bandwidth of the antenna; 2, capacity of being arranged in a plastic bucket and an antenna cover in any shape, ideal directional diagram, capacity of covering the whole space, uniform current distribution, capacities of realizing non-blind area coverage and improving communication quality; 3, capacity of compressing beam width in a vertical plane of the omnidirectional antenna so as to improve the antenna gain due to the adoption of the two-cone shaped reflector structure, capacity of making waves transmitted by a radiating unit radiate from the plane to free space, convenience for improving polarized purity of the antenna; 4, easy implementation of dual-polarized design; and 5, simple technology, fewer welding spots, convenient design and manufacture, and contribution to improving third-order passive intermodulation of the antenna.
Owner:HARBIN ENG UNIV
High-power column vector fiber laser based on linear pseudolaser cavity
InactiveCN106848814AIncreased Polarization PurityIncrease output powerActive medium shape and constructionFew mode fiberGrating
The invention discloses a high-power column vector fiber laser based on a linear pseudolaser cavity. The high-power column vector fiber laser comprises a pumping source, a signal / pumping light beam combiner, a double-cladding ytterbium-doped fiber, a few-mode fiber carved with a raster, a first polarization controller and a second polarization controller. The output end of the pumping source is connected with the pumping input end of the signal / pumping light beam combiner, the few-mode fiber and the signal input end of the signal / pumping light beam combiner are welded in a staggered mode, a stagger point is formed at the welded position, the first polarization controller is arranged on a tail fiber of the few-mode raster on the left side of the staggered point, and the second polarization controller is arranged between the signal input end of the signal / pumping light beam combiner and the staggered point. The output end of the signal / pumping light beam combiner is connected with the double-cladding ytterbium-doped fiber, the output end of the double-cladding ytterbium-doped fiber is a vertical cutting end face and serves as a reflector, resonance is formed by the double-cladding ytterbium-doped fiber and the rasters, and therefore the linear pseudolaser cavity is formed. The high-power column vector fiber laser is simple in structure, high in output column vector laser power and good in polarization purity.
Owner:NANJING UNIV OF POSTS & TELECOMM
Broadband feed source antenna based on asymmetric feed
ActiveCN113140909AIncreased matching bandwidthReduce mutual coupling effectsWaveguide hornsAntennas earthing switches associationBroadbandingWaveguide
The invention relates to the technical field of antennas, and discloses a broadband feed source antenna based on asymmetric feed, which is characterized by comprising a waveguide tube, a horn is arranged at one end of the waveguide tube, a short circuit plate is arranged at the other end of the waveguide tube, and four groups of feed structures are arranged on the waveguide tube. The four groups of feed structures are arranged on the outer side wall of the waveguide tube in an annular array mode, each feed structure comprises a feed end and a conical probe, the conical probes are arranged in the waveguide tube and play a role in disturbing an electromagnetic field in the waveguide tube so that the electromagnetic field can excite a needed field, meanwhile, the conical structures of the conical probes can effectively broaden the matching bandwidth at the feed position, the broadband performance is thus achieved, and due to the fact that in the axial direction of the conical probe, the amplitude phases of electric fields on all surface points are different, the design of the conical probe with the gradually-changed size is adopted, and the matching bandwidth of corresponding ports can be independently widened; uniform-amplitude and anti-phase signals are fed into the feed structures opposite in position, so that the two conical probes opposite in position excite a co-polarization field in the waveguide tube.
Owner:杭州永谐科技有限公司
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