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Planar-broadband dual-polarization base station antenna
InactiveCN104733844AAchieve planarizationSimple structureRadiating elements structural formsAntenna couplingsCoaxial cableCoaxial line
The invention discloses a planar-broadband dual-polarization base station antenna and belongs to the field of mobile communication base station antennae. The planar-broadband dual-polarization base station antenna mainly solves the problems that an existing base station antenna is complex in structure and has difficulty in being integrated with other devices. The planar-broadband dual-polarization base station antenna comprises radiation oscillators (1), feed baluns (2), a baffle board (3), coaxial cables (4), supporting columns (5) and a dielectric material plate (6). The radiation oscillators (1) are dual-polarization planar oscillators at + / -45 degrees, and the feed baluns (2) are planar feed baluns at + / -45 degrees. The radiation oscillator at -45 degrees and the feed balun at +45 degrees are printed on the upper surface of the dielectric material plate (6), and the radiation oscillator at +45 degrees and the feed balun at -45 degrees are printed on the lower surface of the dielectric material plate (6). The dielectric material plate (6) is fixed to the square baffle board (3) through the supporting columns (5). According to the planar-broadband dual-polarization base station antenna, planarization of the radiation oscillators and the feed baluns are achieved, meanwhile, the structure of the baffle board is simplified, and a stable directional diagram characteristic can be obtained in broadband.
Owner:XIDIAN UNIV
Broadband wave absorbing material with stable polarization
ActiveCN106058483AAchieving Polarization Stable CharacteristicsGood polarization stabilityAntennasBroadbandBand width
The invention brings forward a broadband wave absorbing material with stable polarization, for solving the technical problems of poor polarization stability and not wide low-band bandwidth existing in a conventional wave absorbing material. The broadband wave absorbing material comprises a wave absorbing structure (1), an upper medium plate (2), a foam layer (3), a lower medium plate (4) and a frequency selection surface (5), wherein the wave absorbing structure (1) is printed on the upper surface of the upper medium plate (2), the frequency selection surface (5) is printed on the lower surface of the lower medium plate (4), the upper medium plate (2), the foam layer (3) and the lower medium plate (4) are successively arranged to form an up-down stacked structure, the wave absorbing structure (1) is formed by periodically arranging M*N metal broken line units (11) of dead square structures, and the frequency selection surface (5) is formed by periodically arranging M*N frequency selection surface units (51). The polarization stability is high, the absorption frequency band width is wide, the wave absorbing feature is high, the transmission feature at a high frequency is good, and the broadband wave absorbing material with stable polarization can be applied to such fields as antenna communication and absorption shielding and the like.
Owner:XIDIAN UNIV +1
Small ultrawide band antenna with trapped wave characteristic
ActiveCN102610916AAchieve Impedance MatchingExtended current pathRadiating elements structural formsAntenna earthingsCapacitanceDielectric substrate
The invention discloses a small ultrawide band antenna with a trapped wave characteristic. The small ultrawide band antenna consists of a dielectric substrate (1) and metal coating layers positioned on the upper surface and the lower surface of the dielectric substrate (1), wherein a radiation unit (2), a microstrip feeder (4) and interdigital capacitance loading resonance rings (6) and (7) are arranged on the upper surface of the dielectric substrate; the microstrip feeder (4) consists of a microstrip line with characteristic impedance of 50 ohms and a microstrip line with characteristic impedance which is gradually changed linearly from 50 ohms; the two interdigital capacitance loading resonance rings (6) and (7) with different sizes are printed on two sides of the microstrip feeder and used for forming a trapped wave frequency band; and a metal floor consists of a rectangle (3) and a reversed L shape (5) and is printed on the lower surface of the dielectric substrate (1). The working frequency band of the antenna covers 3.1 to 10.6 GHz; interference signals of a plurality of narrowstrip frequency bands can be filtered as required by adjusting relevant parameters, and available frequency bands are retained; and the antenna has the advantages of wide frequency band, narrow attenuation band, miniaturization and strong anti-interference capacity.
Owner:杭州平治信息技术股份有限公司
Electronic static discharge (ESD) protection device with bidirectional silicon controlled rectifier (SCR) structure embedded with interdigital N-channel metal oxide semiconductor (NMOS)
ActiveCN105428354AEnhanced ESD robustnessRealize two-way protectionTransistorSemiconductor/solid-state device detailsSilicon-controlled rectifierEngineering
An electronic static discharge (ESD) protection device with a bidirectional silicon controlled rectifier (SCR) structure embedded with an interdigital N-channel metal oxide semiconductor (NMOS) can be applied to an ESD protection circuit of an on-chip integrated circuit (IC) and mainly comprises a P substrate, a P epitaxial layer, a first N pit, a P pit, a second N pit, a first N+ injection region, a first P+ injection region, a second N+ injection region, a third N+ injection region, a second P+ injection region, a fourth N+ injection region, a fifth N+ injection region, a third P+ injection region, a sixth N+ injection region, a plurality of poly-silicon gates, a plurality of thin gate oxide layers and a plurality of shallow isolation grooves. On one hand, under the positive and negative ESD pulse effects, an ESD current discharge path with a symmetric structure and complete same electrical property exists in the device, the ESD current discharge ability of the device can be improved, and bidirectional protection of an ESD pulse is achieved; and on the other hand, the interdigital NMOS composed of an NMOS M<1> and an NMOS M<2> and a parasitic P pit resistor form a resistance-capacitance coupling current path, so that the ESD robustness of the device is enhanced, the current density in an SCR current conduction path is reduced, the conduction resistance of the SCR is increased, and the maintaining voltage is increased.
Owner:JIANGNAN UNIV
Frequency selective surface structure with improved angle stability
InactiveCN106887710AReduce sensitivityGood resonance stabilityWaveguide type devicesAntennasChinese charactersClosed loop
The invention provides a frequency selective surface structure with improved angle stability, and mainly aims to solve the problem that the existing frequency selective surface is of poor angle stability. The frequency selective surface structure is composed of M*N frequency selective surface units arranged periodically, wherein M>=3, and N>=3. Each frequency selective surface unit consists of a dielectric substrate (1) and a metal patch (2) printed on the surface of the dielectric substrate (1). The frequency selective surface structure is characterized in that each metal patch (2) includes four symmetrically-arranged patterns (21) shaped like a Chinese character 'au'; for each pattern (21) shaped like a Chinese character 'au', the two outer vertical arms are each provided with a hollowed-out gap (23) in the middle and the lower left end is opened in such a way that a continuous winding strip is formed; and the four winding strips are connected end to end through rectangular strips (22) to form a complete square closed-loop strip. The frequency selective surface structure has high angle stability for differently-polarized incident waves, and can be used in satellite communication, reflector antennas and other fields.
Owner:XIDIAN UNIV
Super thin double polarized micro strip antenna
Present invention relates to a ultrathin dual polarization microstrip antenna. It contains radiating element, metal base plate and a pair of power feed parts, wherein two power feed parts fixed on metal base plate, each power feed part including power feed piece and connected impedance inverter circuit, said radiating element supported above two power feed parts, said radiating element having at least two V-groove, each V-groove axial symmetry distributed along radiating element center point, each V-groove angular point nearing to radiating element center point. Said V-groove prolongs current path, reducing resonant frequency, and shortening aerial size, and V-groove having restrictive effect to radiating element surface current to make most of flow along area between adjacent two V-grooves, thereby rising cross polarization ratio.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD
Double-waveband composite broadband wave absorbing material based on frequency selective surface
InactiveCN105655721AImprove absorbing performanceGood absorbencyMagnetic/electric field screeningAntennasDielectric plateResonance
The invention discloses a double-waveband composite broadband wave absorbing material based on a frequency selection surface and aims at solving a problem that a bandwidth of an existing wave absorbing material in a low frequency band is not wide enough. The material comprises a matrix material layer, the frequency selection surface, a dielectric plate and a floor. The frequency selection surface and the floor are printed on upper and lower surfaces of the dielectric plate respectively. The matrix material layer and the dielectric plate form an up-down stack structure. The frequency selection surface is formed through periodically arranging M*N passive resonance units, wherein the M is greater than or equal to 3 and the N is greater than or equal to 3. Each passive resonance unit is formed by a square ring paster and a deformed Jerusalem cross type paster located in an internal portion, and central points of the two are superposed. The deformed Jerusalem cross type paster is formed by a middle cross, four circular rings which are located on a middle cross axis and are successively connected to the middle cross axis and four I-shaped structures. The material possesses advantages that an absorption frequency band is wide and a wave absorbing characteristic is high. Absorption and shielding of electromagnetic waves in C and X wave bands can be realized. The material can be used for fields of communication, environmental protection, human body protection and the like.
Owner:XIDIAN UNIV +1
Low-profile broadband circularly polarized antenna for 5G communication and design method thereof
ActiveCN111864368AIncrease electrical sizeWide Impedance BandwidthRadiating elements structural formsAntennas earthing switches associationCircularly polarized antennaMicrowave
The invention provides a low-profile broadband circularly polarized antenna for 5G communication and a design method thereof and belong to the technical field of microwave passive devices and the antenna comprise an antenna radiation assembly, a reflector assembly and an antenna feed assembly. The antenna radiation assembly is used for signal radiation, and the reflector assembly is used for reflecting radiation signals of the antenna radiation assembly. The antenna radiation assembly comprises an upper layer microwave dielectric substrate and first and second irregular slotted rectangular patch antennas etched on the upper and lower surfaces of the upper layer microwave dielectric substrate. The reflector assembly comprises a lower layer microwave dielectric substrate and a plurality of AMC reflectors distributed on the upper surface of the lower layer microwave dielectric substrate at equal intervals. The AMC reflectors are loaded below the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna; and the antenna feed assembly provides feed for the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna. L-shaped grooves are respectively etched in the first irregular slotted rectangular patch antenna and the second irregular slotted rectangular patch antenna; and the antenna is low in profile and small in size, contains 5G, is compatible with a 4G frequency band, and is wide in bandwidth after being loaded with an artificial magnetic conductor.
Owner:ANHUI UNIVERSITY
Miniaturized low profile ultra-wideband logarithmic periodic monopole array antenna
ActiveCN108682944AHigh bandwidthAdd loading capacitanceLogperiodic antennasAntenna arraysUltra-widebandCapacitance
The invention discloses a miniaturized low profile ultra-wideband logarithmic periodic monopole array antenna, which is characterized by using 22 monopoles operating at different frequencies to realize ultra-wideband characteristics. A radiation directional pattern is directed to the end-fire direction of an array. Part of the monopoles introduce a capacitor to reduce the profile of the overall cell by loading a plate capacitor to the top end; and a substrate with a higher dielectric constant is used to miniaturize a feeding line and the overall structure. The invention can satisfy the standing wave ratio VSWR (2.5, the height of the profile is 0.053 Lambda <l>, and the width is 0.061 Lambda <l> in the bandwidth range of 10.7:1, wherein the Lambda <l> is the wavelength corresponding to thelowest frequency point in the free space. The invention has the advantages that the vertical polarization end-fire directional pattern can be stably realized in the ultra-wideband range, and has thecharacteristics of low profile, compact structure, easy conformality and simple design. The design method and the result can provide theoretical guidance and performance evaluation methods for an airborne platform antenna unit and array, and can provide a new idea for solving conformal antennas on metal body platforms.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Broadband circular polarization capsule antenna combining plane and flexible medium
ActiveCN107134634ASmall footprintMeet special needsRadiating elements structural formsAntenna earthingsMono layerPhysics
The invention discloses a broadband circular polarization capsule antenna combining a plane and a flexible medium and is a capsule antenna which is applied to the internal of the human body and has a broadband circular polarization characteristic and is arranged inside an endoscope. The broadband circular polarization capsule antenna firstly adopts a single-layer circular Rogers medium substrate which has a diameter the same as that of a capsule and coaxial feeding is performed from a bottom; two metal bands are perpendicular to each other on the upper surface of the substrate, wherein one of the metal bands is connected to the ground through short circuit in a position close to the end of a capsule wall and a non-balance feeding mode is formed with the coaxial feeding; on the basis of that, two metal bands on the upper surface of the substrate extend L-shaped branches to the capsule wall so as to achieve following effects: an antenna radiation caliber of the antenna is enlarged and radiation efficiency is increased. Furthermore, the broadband circular polarization capsule antenna of the invention does not occupy too much space inside the capsule while increasing current paths, can better realize miniaturization, forms two orthogonal modes in a needed frequency band and lays the groundwork for circular polarization performance.
Owner:NANJING UNIV OF POSTS & TELECOMM
Microminiature low profile omnidirectional circular polarized antenna
ActiveCN107154529AReduce horizontal sizeSmall sizeRadiating elements structural formsAntennas earthing switches associationCircularly polarized antennaSection plane
The invention belongs to the technical field of an omnidirectional circular polarized antenna and discloses a microminiature low profile omnidirectional circular polarized antenna. The antenna comprises a radiation portion, wherein the radiation portion comprises an upper medium board, four coupling plates, a circular metal ring, a circular metal disc and a center metal column, and the coupling plates, the circular metal ring and the circular metal disc are printed on an upper surface of the upper medium board. The antenna is advantaged in that four metal short circuit columns are connected between tail ends of the coupling plates and a metal floor, a current spreading path on the coupling plates is extended, the transverse dimension of the antenna is effectively reduced, and profile height is further reduced; the inner coupling plates are added in the outer coupling plates, coupling energy among antenna units is enhanced, compared with the prior art, on the condition that directional diagram performance is guaranteed, the dimension of the antenna is substantially reduced, the coupling energy among the control units can be excellently controlled through adjusting distances between the inner coupling plates and the outer coupling plates and length of the inner coupling plates, and thereby antenna work frequency is adjusted.
Owner:XIDIAN UNIV +1
Ultra-wideband planar monopole antenna
ActiveCN108172991ASmall sizeReduce operating frequencyRadiating elements structural formsAntenna earthingsUltra-widebandCapacitance
The invention discloses an ultra-wideband planar monopole antenna. The ultra-wideband planar monopole antenna comprises a dielectric substrate, a monopole radiation patch, a lumped device and a grounding plate, wherein the monopole radiation patch is formed by loading a monopole antenna main body and a top end, a part, near to the grounding plate, of the monopole radiation patch employs a triangular corner and is mainly used for impedance matching of a high-frequency part. A lumped component loaded by the antenna main body is mainly used for reducing a working frequency band of the antenna andgain of a smooth antenna in the whole frequency band, a plurality of rectangular open-circuit branches are loaded at a top end of a monopole, the capacitance between the antenna and floor is improved, and the working frequency band of the antenna is further reduced. By loading the lumped component and additionally arranging open-circuit branches on ground, the antenna size is effectively reducedas well as favorable ultra-wideband characteristic is maintained, and the application of the antenna in the monitoring field is facilitated.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Miniaturized Vivaldi antenna capable of realizing wide band
ActiveCN107317106AImprove impedance characteristicsMiniaturizationRadiating elements structural formsAntenna earthingsAntenna impedanceDielectric substrate
An embodiment of the invention provides a miniaturized Vivaldi antenna capable of realizing wide band. The antenna structure comprises three layers, wherein the second layer is a dielectric substrate prepared from a non-conductive material; the first layer comprises the floor in an antenna feed structure, two antenna radiation arms, two parasitic patches and two loaded lumped resistors; the third layer is a microstrip in the antenna feed structure; the two parasitic patches are arranged below the two antenna radiation arms respectively; and the lumped resistors are used for being connected with the parasitic patches and the antenna radiation arms. By virtue of the parasitic patches, the antenna dimension is not enlarged, the current path on the surface of the antenna and the equivalent electrical length can be prolonged, and the shape and the dimension can be adjustable; and by virtue of the loaded resistors, energy reflection can be reduced, and antenna impedance characteristic can be improved, so that miniaturization of the antenna can be realized effectively, and the dimension of the antenna can be less than or equal to 0.3 times of the corresponding wavelength at the lowest working frequency.
Owner:NAT UNIV OF DEFENSE TECH
Vehicle-mounted 4G knife type antenna
PendingCN107464989AExtended current pathExpand low frequency bandwidthSimultaneous aerial operationsAntenna adaptation in movable bodiesIn vehicleDielectric substrate
The invention discloses a vehicle-mounted 4G knife type antenna comprising a dielectric substrate, an antenna radiating unit printed on the front side of the dielectric substrate, and a metal floor. The antenna radiating unit consists of a low-frequency radiated branch segment, a high-frequency radiated branch segment, and a short-circuit branch segment connected between the antenna radiating unit and the metal floor. A microstrip feeder line for feeding power for the antenna is arranged at the edge of the antenna radiating unit; and a parasitic coupling patch is arranged on the back of the dielectric substrate. The antenna has the following advantages: the requirement on the shark fin outer case dimension is met; the 4G frequency band bandwidth is covered; the standing wave characteristic in the frequency band is good; and the antenna is suitable for automotive 4G communication.
Owner:GUANGDONG SHENGLU TELECOMM TECH
Ultra-wideband dual-polarization chipless RFID label
ActiveCN106096707ALow costImprove spectrum utilizationAntenna supports/mountingsRadiating elements structural formsChipless RFIDMain diagonal
The invention discloses an ultra-wideband dual-polarization chipless RFID label. The ultra-wideband dual-polarization chipless RFID label comprises an antenna radiation unit and a medium substrate. The antenna radiation unit is arranged on the upper surface of the medium substrate. The antenna radiation unit is formed by a square paster. The square paster is provided with four open groove structures including first, second, third and fourth open groove structures. The first and third open groove structures are arranged on a main diagonal of the square paster and are centrally symmetric with respect to the square paster. The second and fourth open groove structures are arranged on an auxiliary diagonal of the square paster and are centrally symmetric with respect to the square paster. The label antenna has the advantages that miniaturization is realized, the capacity is large, the polarization isolation is high, the bandwidth efficiency is high, and printing is easy.
Owner:SOUTH CHINA UNIV OF TECH
Back ring type coupled aerial
InactiveCN101257143AIncrease configuration lengthIncreased configuration convenienceRadiating elements structural formsAntennas earthing switches associationElectrical conductorCoupling
The invention provides a loop type coupling antenna, which includes: a feed-in wire, a coupling conductor, a first coupling part, a second coupling part, a second conductor and a ground surface, one end of the coupling conductor belongs to the first coupling part, another end belongs to the second coupling part; the feed-in wire connects with the first coupling part for providing a feed-in signal to the first coupling part; the feed-in signal couples to the second coupling part through the coupling conductor; one end of the second conductor connects with the second coupling part, another end connects with the ground surface that conduct signal of the second coupling part to the ground surface by using the second conductor. Impedance match can be adjusted efficiently by using the first coupling part, and antenna operation frequency width can be increased. The second coupling part and the second conductor reduce resonant frequency, and shorten wavelength of resonant path center frequency.
Owner:连展科技电子(昆山)有限公司
Inverted-F broadband antenna suitable for vehicle's mobile communication
InactiveCN104701604AReduce section heightExtended current pathSimultaneous aerial operationsAntenna adaptation in movable bodiesLow frequency bandBroadband
The invention discloses an inverted-F broadband antenna suitable for vehicle's mobile communication. The inverted-F broadband antenna comprises a monopole radiating body and a metallic baseboard, wherein the monopole radiating body is formed by thickening one rectangular metal sheet by forming an edge profile, and the different positions along the edge profile of the rectangular radiating body are inward provided with multiple grooves, the monopole radiating body is arranged on the metallic baseboard, the long edge of the monopole radiating body is placed along a horizontal direction, the feed is supplied to the gap between the left lower endpoint of the monopole radiating body and the baseboard, and the right lower endpoint to the metallic baseboard is in a short-circuit status. The antenna operates in high and low frequency bands, the low frequency band is 689MHz-960MHz (VSWR (Voltage Standing Wave Ratio) is no more than 2.15 and the bandwidth is 31.60%), the high frequency band is 1260MHz-6500MHz (VSWR is no more than 2.17 and the bandwidth is 135.05%), and the antenna covers all mobile communication frequency bands of three operators 2G / 3G / 4G, thus the antenna is extremely wide in frequency band, excellent in directivity, high in efficiency, small in size, low in profile and easy to process; the antennas is suitable for the optimized antenna type of high-speed rail mobile communication and beneficial to reduce the air resistance of a train which runs at a high speed.
Owner:GUANGDONG SHENGLU TELECOMM TECH
Frequency selection surface with miniaturized low frequency number ratio
ActiveCN109193167AAdd equivalent capacitanceExtended current pathAntennasLow frequency bandDielectric plate
The invention provides a frequency selection surface with miniaturized low frequency number ratio, which mainly solves the technical problems that two resonant frequency points in low frequency band are far away from each other and the electric size of a unit is large on the existing dual-band frequency selection surface. The frequency selection surface comprises a dielectric plate (2),a metal patch (1) printed on an upper surface of the dielectric board and a metal patch (3) printed on a lower surface of the dielectric board,a metal through hole (4) and a metal connecting wire (5) connectingadjacent units, Each metal patch consists of four metal strips arranged on the surface of the dielectric plate. The first two metal strips form two resonant points of TE polarization and the second two metal strips form two resonant points of TM polarization. The four metal strips of the upper and lower metal patches are connected through metal vias to prolong the current path. The invention realizes good miniaturization effect while possessing low-frequency digital ratio characteristics, and can maintain stable performance for different polarization and angles, and can be applied to antenna sub-reflector of communication system and small communication equipment.
Owner:XIDIAN UNIV +1
Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band
ActiveCN105305069ASmall sizeExtended current pathRadiating elements structural formsAntenna earthingsCircularly polarized antennaISM band
The present invention discloses a differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band. The differential feed implantable circularly polarized antenna comprises an upper layer dielectric substrate, a lower layer dielectric substrate, an antenna radiation unit, a symmetrical coaxial and a floor. The antenna radiation unit is located between two layers of dielectric substrates; the floor is located below the lower layer dielectric substrate; and the symmetrical coaxial includes an upper right coaxial and a lower left upper coaxial, the upper right coaxial and the lower left upper coaxial are located at the diagonal of the antenna radiation unit and are centrally symmetrical with respect to the dielectric substrates. According to the invention, a current path is effectively prolonged, the size of an antenna is reduced, and circular polarization is generated so that multipath loss and polarization mismatch of signals may be effectively inhibited. The differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band has small size, wide axial ratio bandwidth and the like, and is applicable to the field of the human body local area network communication.
Owner:SOUTH CHINA UNIV OF TECH
Two-dimensional circularly-polarized wide-angle scanning phased-array antenna
ActiveCN112787098AReduce gainHigh gainAntenna arraysRadiating elements structural formsEngineeringImpedance matching
The invention discloses a two-dimensional millimeter wave circularly-polarized wide-angle scanning phased-array antenna, and relates to the technical field of millimeter wave antennas. According to the technical scheme, an antenna radiation patch is connected with a rectangular parasitic patch through a high impedance matching microstrip line which is provided with a cross-carved equal length in the center and is used for carrying out impedance matching on the antenna, and a windmill-shaped microstrip radiation patch excitation equal-amplitude in-phase polarization orthogonal degenerate mode is manufactured on the symmetric center of a diagonal bisector of the corner of the antenna radiation patch; feed probes penetrate through the antenna dielectric layer and are connected with the antenna radiation patch through the four rectangular parasitic patches, the four feed probes 4 of each antenna unit feed through rotary feed structures which are equal in amplitude and sequentially differ by 90 degrees, and the windmill-shaped microstrip radiation patch is connected with rectangular blocks of the four rectangular parasitic patches of the four metallized probes for feed. feeding in equal-amplitude excitation with the phase difference of 90 degrees is performed in sequence to form circular polarization radiation, and the antenna arrays are arranged in a rectangular manner at equal intervals according to unit intervals to form an antenna array surface.
Owner:10TH RES INST OF CETC
Semiconductor device
InactiveCN1519927AStatic Energy DecayProtective jointCoupling device connectionsSemiconductor/solid-state device detailsDevice materialParasitic capacitance
Owner:SANYO ELECTRIC CO LTD
Integrated luminous-region high-power vertical-cavity surface-emitting laser
InactiveCN109326957AIncrease current densityImprove conversion efficiencyLaser detailsSemiconductor lasersVertical-cavity surface-emitting laserOhmic contact
The invention provides an integrated luminous-region high-power vertical-cavity surface-emitting laser, comprising: an emitting hole, wherein isolating channels formed in the emitting hole divide theemitting hole into narrow emitting regions communicated with one another, and an insulating layer is arranged in each isolating channel; a conductive layer filling the isolating channels and extendedto two sides to gain ohmic contact with the narrow emitting regions. The emitting hole of the vertical-cavity surface-emitting laser with large oxidization pore size is divided into the narrow emitting regions; the narrow emitting regions gain contact with the conductive layer; on one hand, a current path in the emitting hole is extended, and the current density of the middle region of the vertical-cavity surface-emitting laser with large oxidization pore size can be effectively increased; on the other hand, current may propagate transversely from the conductive layer, distribution uniformityof current density in the mitting hole is greatly improved, and conversion efficiency is improved. In addition, coherence of outgoing light in large range is maintained. The integrated luminous-regionhigh-power vertical-cavity surface-emitting laser is applicable to laser radar, infrared cameras, depth recognition detectors and other fields.
Owner:VERTILITE CO LTD
High voltage metal-oxide-semiconductor transistor and manufacturing method thereof
InactiveCN101345258AExtended current pathImprove breakdown voltageSemiconductor/solid-state device manufacturingSemiconductor devicesOxide semiconductorSource area
The invention provides a high-voltage metal oxide semiconductor transistor, comprising a doped substrate, two first separation structures, a grid structure, a source area, a drain area, two separation structures and two shifting areas; wherein, two first separation structures are respectively arranged in the doped substrate; the grid structure is arranged on part of the two first separation structures and the doped substrate between the two first separation structures; the source area and the drain area are respectively arranged in the doped substrate at one side of the two first separation structures; two second separation structures are respectively arranged below the two first separation structures; furthermore, the upper surface of the second separation structure is less than the lower surface of the first separation structure; two shifting areas are respectively arranged in the doped substrate; furthermore, the source area, the drain area, two first separation structures and two second separation structures are surrounded.
Owner:UNITED MICROELECTRONICS CORP
Log-periodic dipole antenna loaded with rectangular coupled resonators
ActiveCN104538733AIncrease profitHigh bandwidthSimultaneous aerial operationsRadiating elements structural formsDielectric slabDipole array
The invention belongs to the technical field of communication and particularly provides a log-periodic dipole antenna loaded with rectangular coupled resonators. The antenna comprises a pair of log-periodic dipole antenna arrays, a pair of rectangular coupled resonator arrays and an input port. The obverse side of a dielectric slab is provided with one log-periodic dipole array, one rectangular coupled resonator array and a ribbon feeder, wherein the rectangular coupled resonators correspond to dipoles on the reverse side of the dielectric slab in position to form coupled feeding. The reverse side of the dielectric slab is provided with the other log-periodic dipole array, the other rectangular coupled resonator array and a ribbon feeder, and the reverse side of the dielectric slab and the obverse side of the dielectric slab are distributed symmetrically in structure. The center of the dielectric slab is provided with a ribbon feeder. According to the log-periodic dipole antenna loaded with the rectangular coupled resonators, by loading a traditional log-periodic dipole antenna with the rectangular coupled resonator arrays, the advantages of widened frequency band, low cut-off frequency and compact size are achieved.
Owner:昆山亿趣信息技术研究院有限公司
Conformal omnidirectional short wave antenna for helicopter short wave radio communication
InactiveCN105609932ARemove noiseEliminate wire breakageAntenna adaptation in movable bodiesRadiating elements structural formsFiberElevation angle
The invention relates to the technical field of antennas, and particularly relates to a helicopter conformal omnidirectional short wave antenna for helicopter short wave radio communication. The conformal omnidirectional short wave antenna for helicopter short wave radio communication is composed of an antenna radiator (1) and a cable assembly (2), wherein the antenna radiator (1) and the cable assembly (2) are welded as a whole by a core wire, and a bottom feed mode is adopted. The conformal omnidirectional short wave antenna for helicopter short wave radio communication is characterized in that the conformal antenna technology is adopted, the antenna radiator (1) is mounted on the inner surface of a non-metallic and non-carbon fiber skin of the helicopter, the antenna radiator (1) has three sections, and the three sections are connected into a Z type with the consistent shape with the inner surface of the skin of the helicopter through fasteners. The antennas has better performance, and also has the advantages of simple layout, large radiation elevation angle, no jitter noise, no wire breaking phenomenon and no freezing phenomenon.
Owner:CHINA HELICOPTER RES & DEV INST
Graphene-based circularly-polarized intake antenna for capsule endoscopic device
PendingCN109935961ASmall sizeExtended current pathAntenna adaptation in movable bodiesRadiating elements structural formsInterference resistanceMultipath interference
The invention discloses a graphene-based circularly-polarized intake antenna for a capsule endoscope device. The material of each radiation unit and floor of the antenna is a copper-coated graphene film, and the material of the copper-coated graphene film has relatively high carrier density, so that the working bandwidth and gain of the intake antenna can be increased. A graphene double-S combinedstructure radiation patch (4) and a graphene double-S combined structure radiation patch (5) are connected through four short-circuit probes to form a composite spiral structure, so that the circularpolarization characteristic is generated, and the bit error rate is reduced while multipath interference is suppressed. The hook-shaped combined structure of a graphene hook-shaped combined structureradiation patch can reduce the resonant frequency of the antenna and increase the impedance bandwidth of the antenna. The size of the antenna is only Pi*(4.5)<2>mm<3>, and the antenna has the characteristics of wide frequency band, circular polarization, interference resistance, good electromagnetic compatibility, small size and the like. The antenna is suitable for an ISM2.4GHz frequency band, and can meet the working requirements after the complex environment is ingested.
Owner:JINLIN MEDICAL COLLEGE
Large-angle stable miniaturized frequency selective surface
ActiveCN112201959AExtended current pathReduce the equivalent electrical sizeAntennasRadar antennasMetal strips
The invention relates to a miniaturized frequency selective surface, and belongs to the field of radar antennas. The frequency selective surface is formed by arranging a plurality of S*T same units inan equal-period mode, wherein each unit is composed of a dielectric plate in a regular hexagonal prism shape, two layers of metals printed on the upper surface and the lower surface of the dielectricplate and a metal via hole set vertically penetrating through the dielectric plate, the two layers of metals on the upper surface and the lower surface of the dielectric plate are respectively composed of three metal strip lines which are in rotational symmetry, each metal strip line is bent into an arrow shape, and the upper metal strip line and the lower metal strip line are connected through ametal via hole which vertically penetrates through the dielectric plate to form a 2.5 D frequency selection unit structure. The frequency selective surface designed by the invention has a good miniaturization characteristic, can still keep the band elimination performance in a stable frequency band when different polarized electromagnetic waves are incident at a large angle, and is suitable for the fields of wireless communication and radar.
Owner:THE 724TH RES INST OF CHINA SHIPBUILDING IND
A mos device for integrated circuit chip esd protection
InactiveCN103280458BImprove turn-on uniformityIncrease the secondary breakdown currentSemiconductor devicesElectrical resistance and conductancePower flow
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
Microstrip antenna and implantable medical appliance with application of microstrip antenna
InactiveCN105826674AHigh gainLower resonant frequencyAntenna adaptation in movable bodiesRadiating elements structural formsPower flowCoupling
The invention discloses a microstrip antenna, wherein the outer side of a radiation plate of the antenna is an arc line, and the inner side comprises a center groove, a rectangular groove and n arc grooves; the rectangular groove is connected to the center groove and the outer side of the radiation plate; the arc grooves are located between the center groove and the outer side arc line; the head end and the tail end of the first arc groove are connected to the rectangular groove, the head end of the second arc groove is connected to the rectangular groove, the tail end of the third arc groove is connected to the rectangular groove, the head end of the fourth arc groove is connected to the rectangular groove, and this rule is obeyed in succession; and n is a natural number which is not smaller than 2. The microstrip antenna has the advantages that a radiation area is large, so gain increase becomes easier; and an arc notching structure is adopted, so that a current route is longer, resonant frequency is lower, and the antenna size can be reduced more easily. The first arc groove divides the radiation plate into an inner ring and an outer ring, and double resonance can be generated through mutual coupling of the inner ring and the outer ring, so that a bandwidth of the microstrip antenna can be increased greatly. A medical appliance which takes the microstrip antenna as an implantation antenna has a wide bandwidth and the small size.
Owner:CHENGDU UNIV OF INFORMATION TECH
Broadside coupled feeding multi-band frequency broadband planar antenna
InactiveCN103151612AIncrease coupling capacitanceLarge capacitance adjustment rangeSimultaneous aerial operationsRadiating elements structural formsBroadbandPrinted circuit board
The invention discloses a broadside coupled feeding multi-band frequency broadband planar antenna, which comprises a medium substrate, wherein the medium substrate comprises one surface regarded as a front side and another surface which corresponds to the front side and is regarded as an opposite side, the front side of the medium substrate is provided with a metal strip in the width direction, a first bent strip and a second bent strip are connected with the metal strip, the opposite side is provided with a metal surface and a monopole, the monopole is arranged from one side to the other side in the width direction, the monopole and the metal surface are separated by a gap, the monopole is fed by a feeding port formed by two feeding points which are near one side of the medium substrate and are respectively positioned and arranged at two sides of the gap, the mutual parts of projections of the metal strip and the monopole are overlapped, and in positions beyond the region being overlapped with the projection of the monopole, the metal strip is bent at the other side opposite to the feeding port and is then in short circuit with the metal surface through the metal through hole to form a short circuit strip. The broadside coupled feeding multi-band frequency broadband planar antenna has the advantages that the structure is simple, and the integration with a radio-frequency circuit system arranged on a PCB (printed circuit board) is easy.
Owner:SOUTHEAST UNIV
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