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207 results about "Axial ratio" patented technology
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Axial ratio, for any structure or shape with two or more axes, is the ratio of the length (or magnitude) of those axes to each other - the longer axis divided by the shorter. In chemistry or materials science, the axial ratio (symbol P) is used to describe rigid rod-like molecules. It is defined as the length of the rod divided by the rod diameter.
Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna
InactiveCN102136634ACompact and efficientExcellent transceiver isolationAntenna supports/mountingsPolarised antenna unit combinationsReflection lossAxial ratio
The invention provides a Ku / Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna applied to antenna systems, such as a paraboloid antenna and the like, in satellite communication. The antenna adopts a coaxial nested compact structure, and is applied to Ku frequency band and Ka frequency band at the same time. The basic structure of a feed source comprises a circular waveguide, on which a pointed cone shaped dielectric rod is loaded, a flange, a coaxial waveguide, a symmetrical SMA connector pair, a circular polarizer and an orthogonal mode coupler, wherein the feed source in the Ka frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, the circularly polarization axial ratio in Ka double band is smaller than minus 2dB, and the transmitter-receiver isolation is smaller than minus 70dB; and the feed source in the Ku frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, a cross polarization level smaller than minus 40dB, and good transmitter-receiver isolation and reflection loss.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Circularly-polarized-wave patch antenna which can be used in a wide frequency band
InactiveUS6952183B2Wide bandImprove axle ratioSimultaneous aerial operationsRadiating elements structural formsAxial ratioCoaxial cable
A circularly-polarized-wave patch antenna includes a main body having a patch electrode provided with two feeding points and a circuit for generating a phase difference of 90° between signals supplied to the feeding points. A Wilkinson distribution circuit is provided between the 90°-phase-difference generating circuit and a coaxial cable (feeder line) so as to improve a reflection characteristic. The patch antenna includes two feeding points, and thus a favorable axial ratio characteristic can be obtained in a wide band. Also, a favorable reflection characteristic can be obtained in a wide band because of the Wilkinson distribution circuit. Accordingly, the patch antenna can be used in a wider frequency band.
Owner:ALPS ALPINE CO LTD
Agile Diverse Polarization Multi-Frequency Band Antenna Feed With Rotatable Integrated Distributed Transceivers
ActiveUS20140057576A1Agile polarization diversityImprove antenna efficiencyWaveguide hornsSimultaneous aerial operationsTransceiverAxial ratio
A compact, agile polarization diversity, multiple frequency band antenna with integrated electronics for terrestrial terminal use in satellite communications systems is disclosed. The antenna includes an antenna feed having highly integrated microwave electronics that are mechanically and electromagnetically coupled thereto in a distributed arrangement so that diverse polarization senses having a low axial ratio and electronic switching control of the polarization senses is provided. The arrangement of the integrated distributed transceiver configuration enables the mechanical rotation of the orientation of a first transceiver for skew alignment while a second transceiver remains stationary relative to the antenna feed assembly. The first transceiver can be a high-band transmitter and receiver pair that supports linear polarization senses and the second transceiver can be a low-band transmitter and receiver pair that supports circular polarization senses. The antenna system presented is highly compact and offers improved polarization performance previously achievable by only larger devices.
Owner:KVH IND INC
Vehicle mounted satellite antenna system with ridged waveguide
ActiveUS20060132374A1Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesLinear waveguide fed arraysAxial ratioRidge waveguides
The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, the present invention provides a ridged waveguide instead of a conventional rectangular waveguide to alleviate the effects of grating lobes. The ridge waveguide provides a ridged section longitudinally between walls forming the waveguide. A plurality of radiating elements are formed in a radiating surface of the ridged waveguide.
Owner:RENDA TRUST
Low-cost microwave- and millimeter-wave polarized antenna of multi-layer PCB (Printed circuit board) process
InactiveCN104103906AImproving Impedance BandwidthSmall structure sizeRadiating elements structural formsSlot antennasAxial ratioDielectric substrate
The invention discloses a low-cost microwave- and millimeter-wave polarized antenna of the multi-layer PCB (Printed circuit board) process. The polarized antenna is of a multi-layer structure and comprises a quadrate radiating metal patch, an upper dielectric substrate, a metal floor equipped with an H-shaped coupling gap, a medium dielectric substrate, a feed metal plate with power division network, a lower dielectric substrate and a bottom metal floor; the quadrate radiating metal patch is coupled with the floor equipped with the H-shaped coupling gap to realize feed; the feed network of a microstrip line structure is positioned below the floor; the metal floor equipped with the H-shaped coupling gap is connected with the bottom metal floor through a metal through hole; the feed metal plate with the power division network is connected with the bottom metal floor through a second metal through hole to form a coaxial microstrip line conversion structure by which feeding from the bottom part of the antenna is realized. The antenna has the characteristics that the frequency band is wide, the size is small, the cost is low, the manufacturing and processing are simple, and the axial ratio feature is great.
Owner:SOUTHEAST UNIV
Vehicle mounted satellite antenna embedded within moonroof or sunroof
InactiveUS20050146478A1Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesPolarised antenna unit combinationsAxial ratioIn vehicle
The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states.
Owner:RENDA TRUST
Printed quasi-tapered tape helical array antenna
ActiveUS20120188142A1Reduce decreaseMinimize couplingAntenna arraysElectrically long antennasCopper conductorAxial ratio
A printed quasi-tapered tape helical element and printed helical array antenna arc disclosed. The helical element comprises a thin helix conductor having a uniform section associated with a tapered section. The helix conductor can be printed on a thin dielectric sheet and bonded to a hollow composite dielectric support. A solid copper conductor is configured to provide electrical connection between a feeding point of the helix conductor and a microstrip line of a microstrip feed network. The uniform and tapered helix turns are respectively wrapped around the uniform and tapered sections, which enables impedance matching, axial mode excitation, gain and radiation patterns, and damping out of standing waves generated in current distribution over the helix conductor. Conductive composite cups surrounding each helical element reduces mutual coupling in array environment. Thus, the helical element and the array antenna achieve low on-axis and off-axis axial ratio performance over the wideband for global coverage.
Owner:INDIAN SPACE RES ORG OF ISRO
Vehicle mounted satellite antenna system with ridged waveguide
ActiveUS7202832B2Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesLinear waveguide fed arraysAxial ratioRidge waveguides
Owner:RENDA TRUST
Vehicle mounted satellite antenna system with inverted L-shaped waveguide
ActiveUS20050146477A1Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesLinear waveguide fed arraysAxial ratioWaveguide
The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, an inverted L-shaped waveguide has a first wall extending vertically downward from a top surface. The top surface can include a ridge portion. The top surface includes a plurality of radiating elements for forming a radiating surface.
Owner:RENDA TRUST
Circular polarized compound loop antenna
ActiveUS8164532B1Improve antenna efficiencyImproves axial ratio of antennaElongated active element feedLoop antennasElectricityAxial ratio
Embodiments provide single-sided and multi-layered circular polarized, self-contained, compound loop antennas (circular polarized CPL). Embodiments of the CPL antennas produce circular polarized signals by using two electric field radiators physically oriented orthogonal to each other, and by ensuring that the two electric field radiators are positioned such that an electrical delay between the two electric field radiators results in the two electric field radiators emitting their respective electric fields out of phase. Ensuring the proper electrical delay between the two electric field radiators also maintains high efficiency of the antenna and it improves the axial ratio of the antenna.
Owner:DOCKON
Small-sized double-frequency active navigation antenna device
InactiveCN103022663AHigh gainSuppress interferenceRadiating elements structural formsResonant antenna detailsAxial ratioMultipath interference
The invention provides a small-sized double-frequency active navigation antenna device which comprises a suppression plate, a first microstrip patch, a second microstrip patch, a first substrate and a second substrate. The first microstrip patch is arranged on the top face of the first substrate, the second microstrip patch is arranged on the top face of the second substrate, the second microstrip patch is arranged between the first substrate and the second substrate, and the second substrate is arranged on the top face of the suppression plate; the first microstrip patch, the second microstrip patch, the first substrate and the second substrate are arranged in a 45 degrees inclined angle in an axial direction with the suppression plat. The device improves the the axial ratio, the impedance bandwidth, the stability of a phase center of the antenna, the signal receiving ability of a low elevation GNSS (Global Navigation Satellite System) and an ability to resist multipath interference, and the placing form of the antenna microstrip patch is more applicable to the actual handheld device application. By means of a combination way of a low insertion loss filter and a out-of-band high suppression filter, the noise figure is low and the antijamming capability is improved. The inside antenna and the outside arranged antenna have the advantages of being quick in switching speed, simple in operation and high in insulation.
Owner:GUANGZHOU HI TARGET NAVIGATION TECH
Ku/Ka two-waveband transmitting-receiving share feed source
The invention provides a Ku / Ka two-waveband transmitting-receiving share feed source, which comprises a Ku waveband transmitting-receiving system and a Ka waveband transmitting-receiving system, wherein the Ku waveband transmitting-receiving system comprises a Ku radiation end, a stepped choke ring, a coaxial connecting piece, a Ku waveband coaxial orthomode coupler and a Ku waveband receiving-end filter which are connected in sequence; the Ka waveband transmitting-receiving system and the Ku waveband transmitting-receiving system are nested coaxially; and the Ka waveband transmitting-receiving system comprises a dielectric rod structure, a dielectric circular polarizer, a Ka waveband orthomode coupler and a Ka waveband receiving-end filter which are connected in sequence. According to the Ku / Ka two-waveband transmitting-receiving share feed source provided by the invention, a Ku wave receiving-end standing wave is less than 1.4, the cross polarization is less than -30dB, a transmitting-end standing wave is less than 1.3, the cross polarization is less than -23dB, the transmitting-receiving isolation is less than -110dB, a Ka wave receiving-end standing wave is less than 1.8, a transmitting-end standing wave is less than 1.7, the axial ratio is less than 1.8, and the transmitting-receiving isolation is less than -82dB.
Owner:BEIJING TIANGONG KAIZHENG TECH
Multifrequency patch antenna device
ActiveCN101789538AImprove stabilityHigh measurement accuracySimultaneous aerial operationsAntenna supports/mountingsLow noiseAxial ratio
The invention relates to a multifrequency patch antenna device, comprising a patch antenna, a printed circuit board (PCB), a shielding case and a low-noise amplifying circuit, wherein the patch antenna further consists of a patch antenna, a multi-frequency band feed network, a multi-frequency band feed probe and at least four feedback points; the at least four feedback points form at least two groups of feed points; one end of each of the at least two feed points is connected with the patch antenna, and the other end thereof respectively passes through the PCB via the multi-frequency band feed probe to be connected with the multi-frequency band feed network; and a shielding case is connected with the PCB. The invention improves the stability of antenna phase center, lowers axial ratio, and enables the matching to be much simpler and the antenna to become more compact. The device in the invention can receive multipath carrier at the same time, thus eliminating interference on an ionized layer and improving measurement precision.
Owner:HARXON CORP
Vehicle mounted satellite antenna system with inverted L-shaped waveguide
ActiveUS6977621B2Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesLinear waveguide fed arraysAxial ratioWaveguide
The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, an inverted L-shaped waveguide has a first wall extending vertically downward from a top surface. The top surface can include a ridge portion. The top surface includes a plurality of radiating elements for forming a radiating surface.
Owner:RENDA TRUST
Vehicle mounted satellite antenna system with in-motion tracking using beam forming
InactiveUS7391381B2Low axle ratioImprove efficiencyRadio wave direction/deviation determination systemsAntenna adaptation in movable bodiesAxial ratioAzimuth direction
Owner:RENDA TRUST
Vehicle mounted satellite antenna embedded within moonroof or sunroof
InactiveUS7227508B2Low axle ratioImprove efficiencyAntenna adaptation in movable bodiesPolarised antenna unit combinationsAxial ratioEngineering
Owner:RENDA TRUST
Broadband low-section omni-directional circularly polarized antenna
ActiveCN106785408AHigh bandwidthGood axial ratioRadiating elements structural formsIndividually energised antenna arraysAntenna impedanceCircularly polarized antenna
The invention discloses a broadband low-section omni-directional circularly polarized antenna. A dielectric substrate of the broadband low-section omni-directional circularly polarized antenna comprises an upper-layer dielectric substrate and a lower-layer dielectric substrate, the upper-layer dielectric substrate and the lower-layer dielectric substrate are parallel to each other, and the upper-layer dielectric substrate is positioned right above the lower-layer dielectric substrate; a metal floor is adhere on the lower-layer dielectric substrate; a zero-order resonator, a parasitic radiator and a radiation type feeding network are adhered on the upper-layer dielectric substrate; the radiation type feeding network is positioned in the center of the upper-layer dielectric substrate; zero-order resonant patches of the zero-order resonator are annularly on the outer side of the radiation type feeding network, one end of each zero-order resonant dowel of the zero-order resonator is connected with the corresponding zero-order resonant patch, and the other end of each zero-order resonant dowel is connected with the metal floor; parasitic radiation patches are annularly arranged on the outer sides of the zero-order resonant patches, one end of each parasitic radiation dowel of the corresponding parasitic radiation patch is connected with the corresponding parasitic radiation patch, and the other end of each parasitic radiation dowel is suspended. The broadband low-section omni-directional circularly polarized antenna has the advantages that impedance of the broadband low-section omni-directional circularly polarized antenna and the bandwidths of directional diagrams can be increased, and excellent axial ratio characteristics can be kept.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Broadband broad-angle circular polarization overlapping microstrip antenna
ActiveCN104078768ALow profileImprove radiation efficiencyRadiating elements structural formsResonant antennasAxial ratioResonance
The invention discloses a broadband broad-angle circular polarization overlapping microstrip antenna which is low in profile, wide in axial ratio and impedance bandwidth, and good in wide-angle axial ratio performance. According to the technical scheme, an upper-layer rectangular microstrip metal patch (9) serving as a parasitic radiator is attached under a covering layer dielectric slab (1), a lower-layer rectangular microstrip metal microstrip patch (8) serving as a driving radiator is attached to the upper portion of a bottom-layer dielectric slab (5), the upper-layer rectangular microstrip metal patch works at a high-frequency end in a resonance mode, and the lower-layer rectangular microstrip metal microstrip patch works at a low-frequency end in a resonance mode; a cavity with the dielectric slabs as walls is formed in the central area of a rectangular box body, the cavity area is filled with a dielectric body of which the dielectric constant is similar to that of the air, a feed probe (10) is fixedly connected with the lower-layer rectangular microstrip metal microstrip patch through a metallized via hole, the metallized via hole penetrates through the bottom-layer dielectric slab, and the diameter of the metallized via hole is larger than the feed probe. By means of the broadband broad-angle circular polarization overlapping microstrip antenna, a wider work bandwidth can be achieved.
Owner:10TH RES INST OF CETC
Vehicle mounted satellite antenna system with in-motion tracking using beam forming
InactiveUS20050146476A1Low axle ratioImprove efficiencyRadio wave direction/deviation determination systemsAntenna adaptation in movable bodiesAxial ratioAzimuth direction
The present invention relates to a vehicle mountable satellite antenna as defined in the claims which is operable while the vehicle is in motion. The satellite antenna of the present invention can be installed on top of (or embedded into) the roof of a vehicle. The antenna is capable of providing high gain and a narrow antenna beam for aiming at a satellite direction and enabling broadband communication to vehicle. The present invention provides a vehicle mounted satellite antenna which has low axial ratio, high efficiency and has low grating lobes gain. The vehicle mounted satellite antenna of the present invention provides two simultaneous polarization states. In one embodiment, a hybrid mechanic and electronic steering approach provides a more reasonable cost and performance trade-off. The antenna aiming in the elevation direction is achieved via control of an electronic beamforming network. The antenna is mounted on a rotatable platform under mechanical steering and motion control for aiming the antenna in the azimuth direction. Such approach significantly reduces the complexity and increases the reliability of the mechanical design. The antenna height is compatible to the two-dimensional electronic steering phased-array antenna. Additionally, the number of the electronic processing elements required is considerably reduced from that of the conventional two-dimensional electronic steering phased-array antenna, thereby allowing for low cost and large volume commercial production. The present invention provides electronically generated left, right, up, and down beams for focusing the antenna beam toward the satellite while the vehicle is moving. All of the beams are simultaneously available for use in the motion beam tracking. This provides much faster response and less signal degradation.
Owner:RENDA TRUST
Communication and navigation integrated integration antenna
PendingCN110401034ASave spaceComposite functionParticular array feeding systemsRadiating elements structural formsAxial ratioSystems design
The invention discloses a communication and navigation integrated integration antenna, and belongs to the technical field of microwave array antennas. The invention proposes an integrated design of anantenna unit and a network, physically adopts a multi-layer plate crimping technology to integrate the radio frequency and a digital circuit, perform the aperiodic arrangement of the antenna unit ofthe satellite communication and rotate the feeding to improve the axial ratio of the antenna. In the gap between the antenna units, a series of antennas for satellite navigation, including an L-band anti-jamming receiving antenna, a Beidou antenna, a Beidou directional antenna and a short message service antenna, are fully utilized, so that the functional diversification of the system design is fully considered, and the S-band satellite communication phased array antenna is laid out, and the navigation antenna is decomposed and designed to simplify the design difficulty. The communication andnavigation integrated integration antenna is applicable to various platforms, can be used as an antenna for satellite communication and satellite navigation combination, and is particularly suitable for occasions where the installation space of the platform is limited but the type of the antenna is required.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
High Efficiency Agile Polarization Diversity Compact Miniaturized Multi-Frequency Band Antenna System With Integrated Distributed Transceivers
ActiveUS20140139386A1Agile polarization diversityImprove antenna efficiencyWaveguide hornsSimultaneous aerial operationsTransceiverPolarization diversity
Owner:KVH IND INC
Multimode occulting antenna with stable phase center
ActiveCN102509845AImprove impedance characteristicsImprove frequency coverageAntenna supports/mountingsRadiating elements structural formsAxial ratioGlobal Positioning System
A multimode occulting antenna with a stable phase center comprises a reflection cavity, a lower radiation paster, an upper radiation paster, four feed probe sleeves, four feed probe inner cores and two support columns. Each feed probe sleeve comprises a metal seat and filler, one end of the metal seat is a metal column, the other end of the metal seat is a cylindrical metal cavity, and the filler is used for filling the cylindrical cavity of the metal seat. The sleeve-shaped probes are coupled with feed through four points, probes are uniformly distributed on the circumference, an aerial radiation paster consists of an upper layer and a lower layer, the lower layer is coupled with the feed through the sleeve-shaped probes, the upper layer is coupled with the feed through the lower radiation paster, the middle is supported by the metal support columns, and the reflection cavity is of a round bowl-shaped structure and higher than the upper radiation paster. The occulting antenna is excellent in performance and structure, simple and reliable in process, wide in frequency band, capable of meeting use requirements of a GPS (global positioning system), BD-2, GALILEO and GLONASS, wide in beam coverage, high in gain, stable in phase center, excellent in axial ratio performance, and applicable to a precise obscuration detection system and other high-precision detection systems.
Owner:SPACE STAR TECH CO LTD
Final fabrication and calibration steps for hierarchically elaborated phased-array antenna and subarray manufacturing process
A process writes phase shift error correction values into a phased-array antenna to normalize a range of manufacturing variances. An axial ratio is determined for an antenna weight vector (AWV) by making multiple measurements with the horn of a test antenna mechanically rotating from 0 to 180 degree or with dual polarization test antenna. For calibration of the whole array, each subarray is treated in the same fashion as equivalent to an antenna element in the subarray calibration. The subarray is electronically rotated as a whole (all elements rotated by the same phase shift value) from 0 to 360 degree during the full array calibration. Due to small power variation among AWVs, calibration solely by REV results fail to consistently converge to resolution. Accordingly, the apparatus measures and compares axial ratios. During final fabrication, the apparatus programs an AWV with best axial ratio into each non-transitory array element.
Owner:TUBIS TECH INC +1
Elliptic blade edge-modeling system and elliptic blade edge-modeling method for impellers
ActiveCN103032372AImplement the modeling programImprove computing efficiencyPump componentsPumpsImpellerAxial ratio
The invention provides an elliptic blade edge-modeling system for impellers, which comprises a data input module, a coordinate transformation module, a two-dimensional plane curve elliptic transition module, a three-dimensional curved surface generation module and a data output module, which are used for first reading blade surface data points and blade edge parameters, then transforming and mapping the coordinates of the blade data points into a two-dimensional plane (m, r * Theta), using B-splines to fit the two-dimensional data points to obtain a curve (1) and a curve (2), first generating an initial ellipse on the bases, then iteratively generating a final ellipse and a blade surface and finally outputting impeller data. The invention also provides a corresponding method. The invention provides a modeling design method for a variable-axial ratio elliptic blade edge for the first time, achieves an impeller-modeling program, and can automatically generate an impeller under the conditions of given impeller data points and blade edge shape parameters. The calculation efficiency of a programmed algorithm is high, operation is easy, and the invention can be applied in the three-dimensional modeling design of various impellers.
Owner:SHANGHAI JIAO TONG UNIV
Satellite positioning antenna device
InactiveCN103311670AGood circular polarization axis ratioHigh elevation gainPolarised antenna unit combinationsAntenna couplingsAxial ratioPhase shifted
The invention relates to an antenna technology, and provides a satellite positioning antenna device which can realize low elevation gain, good circular polarization axial ratio and high transmitting and receiving isolation. The satellite positioning antenna device comprises an upper layer of microstrip antenna, an intermediate layer of microstrip antenna, a lower layer of microstrip antenna and a printed circuit board (PCB) with a phase shift feed network on the back side, wherein the upper layer of microstrip antenna comprises an upper layer of microstrip antenna dielectric slab and an upper layer of microstrip antenna radiation patch layer; the intermediate layer of microstrip antenna comprises an intermediate layer of microstrip antenna dielectric slab and an intermediate layer of microstrip antenna radiation patch layer; the lower layer of microstrip antenna comprises a lower layer of microstrip antenna dielectric slab and a lower layer of microstrip antenna radiation patch layer; a feed probe of the lower layer of microstrip antenna, a feed probe of the intermediate layer of microstrip antenna and a coaxial feed cable of the upper layer of microstrip antenna are connected with the feed network; and a first plated-through hole is formed in the central position of the lower layer of microstrip antenna, a second plated-through hole is formed in the central position of the intermediate layer of microstrip antenna, and a third plated-through hole is formed in the lower layer of microstrip antenna at the feed probe of the intermediate layer of microstrip antenna.
Owner:HARXON CORP
Method and system for a single-fed patch antenna having improved axial ratio performance
InactiveUS20060097922A1Simultaneous aerial operationsAntenna adaptation in movable bodiesAxial ratioDielectric substrate
A micro-strip antenna includes a conducting ground plane and a dielectric substrate mounted above the conducting ground plane. A patch element is mounted above the dielectric substrate and configured to produce an antenna pattern. The antenna pattern is formed by a number of linear polarization components. The patch element includes a single feed point extending through the conducting ground plane and the dielectric substrate. Two or more notches within the patch element are configured to perturb each of the linear polarization components.
Owner:MITRE SPORTS INT LTD
Compact type broadband bicircular polarization patch antenna based on coupling microstrip line coupler
ActiveCN103247866ALow costSimple structural designAntenna supports/mountingsRadiating elements structural formsCapacitanceAxial ratio
A compact type broadband bicircular polarization patch antenna based on a 3 dB coupling microstrip line coupler adopts a printed circuit board technology to arrange a feed network, a ground plane and capacitance coupling patches and a main radiation patch on the upper surfaces and the lower surfaces of two dielectric substrates from bottom to top, wherein the feed network is the 3 dB broadband coupling microstrip line coupler with a compact structure, so that the circular polarization orthogonal feed network with functions of power distribution and 90-degree phase shift is formed; and the two dielectric substrates are supported and fixed by upright columns and nuts made of a non-conducting material, and a gap is reserved between the two dielectric substrates to form air dielectrics. Two output ends of the feed network and the two capacitance coupling patches are connected together through two feed probes, and the orthogonal feed is performed on the main radiation patch through the mode of combining the metal probes and the capacitance coupling patches, and accordingly, circular polarization radiation with high gain, low axial ratio and broadband is achieved. The antenna achieves miniaturization of the broadband circular polarization patch, is simple in structure and low in cost, and facilitates popularization and application.
Owner:北京神州腾耀通信技术有限公司
Circular polarized antenna with omnidirectional broad axial ratio beam width
InactiveCN102509879AImproved Axial Ratio BeamwidthWide Impedance BandwidthRadiating elements structural formsAntenna earthingsElectrical conductorCircularly polarized antenna
The invention discloses a circular polarized antenna with omnidirectional broad axial ratio beam width. The circular polarized antenna comprises a parasitic element, an upper-layer medium baseplate, an exciting element, a middle-layer medium baseplate, an earthing unit, a lower-layer medium baseplate and a 3dB mixed electric bridge electric feeding network, wherein the parasitic element and the exciting element are respectively arranged on the upper surfaces of the upper-layer medium baseplate and the middle-layer medium baseplate; the upper-layer medium baseplate and the middle-layer medium baseplate are separated by an air layer; the 3dB mixed electric bridge electric feeding network is placed on the lower surface of the lower-layer medium baseplate; an internal conductor of a coaxial electric feeding unit is connected with an input port of the 3dB electric bridge electric feeding network; and an external conductor of the coaxial electric feeding unit penetrates through the lower-layer medium baseplate and is connected with the earthing unit. According to the invention, not only is the circular polarized radiation realized very well, at the same time, the circular polarized antenna has broader axial ratio beam width within the omnidirectional range, is small in volume, is low in section plane, is light in weight, is simple in structure, and is easy to be conformal.
Owner:SHANGHAI JIAO TONG UNIV
A design method for compact and lamination structure microstrip antenna integrated with the receiving and sending functions
InactiveCN101060199AMeet the performance requirements of the whole machineTake advantage ofRadiating elements structural formsAxial ratioModeling and simulation
The related design method for compact stack integrated microstrip antenna comprises: 1. modeling and simulating the entire structure to obtain the key performance parameter; 2. determining / adjusting the top antenna radiator and its feed part position according to real requirement, adding a compensation strip on the bottom antenna radiation strip, determining the exact size, and optimizing the axial ratio performance and angle of elevation gain; and 3. adding a metal base under the public ground.
Owner:BEIHANG UNIV
Leaky wave antenna with radiating structure including fractal loops
ActiveUS7250916B2Solve narrow bandwidthCurrent smoothingSimultaneous aerial operationsRadiating elements structural formsAxial ratioPhased array
An antenna is provided for acquiring RF signals from various satellite ranging systems including GPS, GLONASS, GALILEO and OmniSTAR®. The antenna configuration includes a radiating structure of multi-arm spiral slots terminated with fractal loops. A leaky wave microstrip spiral feed network is used to excite the radiating structure of the antenna. The fixed beam phased array of aperture coupled slots is optimized to receive a right hand polarized signal. The proposed antenna is made out of a single PCB board. The antenna has a very uniform phase and amplitude pattern in the azimuth plane from 1.15 to 1.65 GHz, therefore providing consistent performance at GPS, GLONASS, GALILEO and OmniSTAR® frequencies. The antenna also has a common phase center at the various frequencies from 1175 MHz to 1610 MHz and substantially the same radiation pattern and axial ratio characteristics.
Owner:NOVATEL INC
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