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662 results about "Circular waveguide" patented technology
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Cylindrical or Circular Waveguides Cylindrical or circular waveguides are those that maintain a uniform circular cross section along their length. The method of solution of the electromagnetic field equations for circular waveguides is similar to that for rectangular waveguides. Cylindrical or circular waveguide
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
Hexagonal array structure of dielectric rod to shape flat-topped element pattern
InactiveUS7167139B2Wide beam scanning rangeConstant electric performanceIndividually energised antenna arraysLeaky-waveguide antennasCouplingEngineering
A hexagonal array structure of a dielectric rod for shaping a flat-topped element pattern (FTEP) is provided. The hexagonal structure of dielectric rods forming a flat-topped element pattern (FTEP) includes: a center element for forming a unit radiation pattern of the FTEP through an electromagnetic wave mutual coupling by receiving a polarization signal of a basic mode; a plurality of first ring elements arranged at vertexes of a regular hexagon based on the center element for forming the unit radiation pattern by electromagnetic wave mutual coupling with the center element and an electromagnetic wave; and a circular waveguide array supporting unit for supporting the center element and the plurality of first ring elements.
Owner:ELECTRONICS & TELECOMM RES INST
Multiband waveguide reflector antenna feed
A multiband waveguide reflector antenna feed comprises waveguide feeds in a concentric architecture. A waveguide feed is located in the center and coaxial waveguide feeds are disposed around the center feed. The waveguide feeds may be all-metallic with the center feed operating in a TE11 mode and the coaxial feeds operating in a coaxial TE11 mode. The waveguide feeds may have electromagnetic band gap (EBG) surfaces on waveguide surfaces. The center waveguide feed may have an EBG outer conductor surface and operate in a circular waveguide TEM mode. The coaxial waveguide feeds may have EBG inner and outer conductors and operate in a circular waveguide TEM mode. The coaxial feeds may have EBG inner conductors and near perfect electrical conductor (PEC) outer conductors and operate in a circular waveguide-like TE11 mode or may comprise EBG outer conductors and PEC inner conductors and operate in a quasi-TEM waveguide mode.
Owner:ROCKWELL COLLINS INC
Universal microwave waveguide joint and mechanically steerable microwave transmitter
ActiveUS8963790B2Simple processSmall sizeWaveguide type devicesAntennasRange of motionUniversal joint
A universal joint comprising a pair of circular waveguide ball-joints and a slip-joint allows for simultaneous 3-axis rotation and 3-dimensional translation between an antenna and a stationary source. As such, the universal joint does not have to be physically aligned with the azimuth, and elevation, rotation axis of the antenna and mounted on the gimbal support, greatly simplifying the antenna steering mechanism. The universal joint allows the antenna to be mass-balanced in relation to the azimuth and elevation axis without adding any additional counter weights, thus reducing the size and power requirements of the azimuth and elevation rotation drive systems. Additional ball-joints may be provided to increase the allowed range of motion of the antenna.
Owner:RAYTHEON CO
Wide-angle irradiation feed source device with parasitic matched media and microwave antenna
InactiveCN102208716AWide Feed Radiation AngleGood standing wave performanceAntennasManufacturing cost reductionMicrowave
The invention relates to a wide-angle irradiation feed source device with parasitic matched media and a microwave antenna. The wide-angle irradiation feed source device with the parasitic matched media comprises components such as guided wave media, the parasitic matched media, metal reflecting surfaces, reflective matching steps and the like. The parasitic matched media are arranged on the lateral surfaces of the guided wave media. The metal reflecting surfaces are formed on the upper surfaces of the guided wave media. The reflective matching steps are positioned at the bottom ends of the metal reflecting surfaces. Primary reflecting regions are positioned between the guided wave media and the parasitic matched media. Secondary reflecting regions are positioned outside the parasitic matched media, and are parallel to the primary reflecting regions. One end of each circular waveguide is inserted between the corresponding guided wave medium and the corresponding parasitic matched medium. The microwave antenna comprises a paraboloid and the wide-angle irradiation feed source device with the parasitic matched media. One end of the wide-angle irradiation feed source device with the parasitic matched media is fixed at the top end of the paraboloid. The feed source device provided by the invention is in fit with the short-focus paraboloid to realize the high-performance and low-profile microwave antenna, and the manufacturing cost is effectively reduced.
Owner:赵铭
Antenna device and transmitting/receiving device
InactiveUS7064726B2Conducive to loadManufacturing costWaveguide hornsIndividually energised antenna arraysPhysicsHigh frequency
An antenna apparatus includes two circular waveguides including a fixed-side circular waveguide and a rotation-side circular waveguide, each having a propagation mode in a TM01 mode, and being arranged coaxially with each other while a waveguide-side choke is provided between the two waveguides. A rectangular waveguide is connected to the fixed-side circular waveguide. Thereby, the high-frequency signal fed from the rectangular waveguide to the fixed-side circular waveguide can be radiated from a primary radiator to which the rotation-side circular waveguide is connected. While the circular waveguides and the waveguide-side choke can constitute a rotary joint, by rotating the primary radiator together with the rotation-side circular waveguide, scanning can be carried out with a high-frequency signal radiated from the primary radiator.
Owner:MURATA MFG CO LTD
Switchless combining system and method
A switchless combiner for high-power broadcast signals incorporates a circular waveguide configured as an orthogonal mode transducer to provide a coherent signal and a phase rotator to steer the combined signal to an output coupler. Out-of-phase RF is absorbed by a station load. The phase rotator is capable of redirecting the output from either of the sources or all of the combined output to the station load. Switching between destinations for the RF components may be made with power applied. The input and output characteristics and mechanical configuration permit the switchless combiner to be integrated with other high-power RF broadcast signal manipulation devices.
Owner:SPX CORP
Wideband radial power combiner/divider fed by a mode transducer
InactiveUS7385462B1Unparalleled sizeUnparalleled weightMultiple-port networksOne-port networksPower combinerTransducer
A radial power combiner / divider capable of a higher order (for example, N=24) of power combining / dividing and a 15% bandwidth (31 to 36 GHz). The radial power combiner / divider generally comprises an axially-oriented mode transducer coupled to a radial base. The mode transducer transduces circular TE01 waveguide into rectangular TE10 waveguide, and the unique radial base combines / divides a plurality of peripheral rectangular waveguide ports into a single circular TE01 waveguide end of the transducer. The radial base incorporates full-height waveguides that are stepped down to reduced-height waveguides to form a stepped-impedance configuration, thereby reducing the height of the waveguides inside the base and increasing the order N of combining / dividing. The reduced-height waveguides in the base converge radially to a matching post at the bottom center of the radial base which matches the reduced height rectangular waveguides into the circular waveguide that feeds the mode transducer.
Owner:NAT AERONAUTICS & SPACE ADMINISTATION U S GOVERNMENT AS REPRESENTED BY THE ADMINISTATOR OF THE
Process for manufacturing high gain dual-linear polarization or dual-circle polarization waveguide array antennas
ActiveCN101083359AFix compatibility issuesResolve mutual interferencePolarised antenna unit combinationsResonant cavityManufacturing technology
The invention publishes a wave guide array antennas manufacture method of high gain crewel polarized or the double circular polarized, which relates to a wave guide array antennas manufacture technique in the correspondence broadcast and measure-control domain. The invention has designed the radiation level, the horizontal polarization or the circular polarization feed wave guide level, the perpendicular polarization feed wave guide level, the perpendicular polarization feed wave guide lap, the feed way of using the square or the circular waveguide resonant cavity, has solved the receive and launch of the double polarized electromagnetism signal; The horizontal polarization uses the coupling feed way and the perpendicular polarization uses the direct feed way, completes the separation of the two polarized components, simultaneously may realizes the double circular polarized work. The invention has the double polarized radiation, the high feed efficiency, compact structure, low processing cost and so on merits, is specially suitable for the manufacture of each kind of satellite communication or single control station antenna which works in the double thread polarization or double circular polarized application situations.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
Microwave-Assisted Chemical Synthesis Instrument with Fixed Tuning
InactiveUS20030089706A1Good flexibilityImprove efficiencyLavatory sanitoryDisinfectionChemical synthesisMicrowave irradiation
Abstract of Disclosure An instrument is disclosed for microwave-assisted chemical processes that avoids tuning discrepancies that otherwise result based upon the materials being heated. The instrument includes a source of microwave radiation, a waveguide in communication with the source, with at least a portion of the waveguide forming a cylindrical arc, a cylindrical cavity immediately surrounded by the cylindrical arc portions of the waveguide, and at least three slotted openings in the circumference of the circular waveguide that provide microwave communication between the waveguide and the cavity.
Owner:CEM CORP
Cup waveguide antenna with integrated polarizer and OMT
InactiveUS8077103B1Compact structureGood radiation characteristicsWaveguide type devicesAntenna detailsPolarizerOrthomode transducer
A cup waveguide antenna with integrated polarizer and OMT for simultaneously communicating left and right hand circularly polarized electromagnetic waves is adjustable to obtain efficient propagation and reception of electromagnetic waves. The antenna includes a circular waveguide having an orthomode transducer utilizing first and second pins longitudinally spaced apart and oriented orthogonally with respect to each other. Six radially-oriented adjustable polarizer screws extend from the exterior to the interior of the waveguide. A septum intermediate the first and second pins is aligned with the first pin. Adjustment of the polarizer screws enables maximized propagation of and / or response to left hand circularly polarized electromagnetic waves by the first pin while simultaneously enabling maximized propagation of and / or response to right hand circularly polarized electromagnetic waves by the second pin.
Owner:NASA
Lens antenna with tapered horn and dielectric lens in horn aperture
A lens antenna having high antenna efficiency, low sidelobe levels, and that is easily assembled. The lens antenna includes a first horn made of a metallic conductor, a second horn made of a high-frequency absorbing plastic material, and a lens for controlling the power distribution at an aperature of the horn. Screws may be used to assemble the first horn, the second horn, and the lens. Though some of the microwave signals input through the circular waveguide of the first horn are reflected on the surface of the lens, most of the microwave signals are absorbed by the second horn. Moreover, because no wave absorber is bonded to an inner wall of a conical horn, nothing screens the microwave signal, the power density distribution at the aperture of the lens is not disrupted. Therefore, it is possible to obtain a desired power density distribution.
Owner:NEC CORP
Four-band multi-polarization co-aperture feed source
ActiveCN102938497AImprove compactnessReduce volumeWaveguide hornsRadiating elements structural formsCircularly polarized antennaResonance
The invention relates to a four-band multi-polarization co-aperture feed source. The four-band multi-polarization co-aperture feed source is formed by combining a double linear polarization antenna of a Ku band and a double circular polarization antenna of a Ka band and comprises a conical horn, a Ku circular waveguide, a tuning screw, a Ku flange, a horizontal polarization power divider, a first flange, a vertical polarization power divider, a medium rod, a circular waveguide feed window, a stop screw, a transition section and a double circular polarization antenna. The antenna of the Ku band uses four ports for symmetrical feeding to improve the symmetrical characteristic of a directional diagram, a transmission waveguide of an electromagnetic field of the Ku band is used as the transition section of the electromagnetic field of the Ka band, and the resonance medium rod is embedded into the waveguide of the Ku band for transmitting electromagnetic waves of the Ka band so that compactness of the antenna is greatly improved. By means of dielectric waveguides and conical horn nesting technologies, the purposes of achieving antenna beam conformity and sharing one phase center are achieved, uniformities of directional diagrams and uniformities of the phase centers in four working bands are guaranteed, isolation among bands is increased, and the compactness of the antenna is improved.
Owner:BEIJING RES INST OF TELEMETRY +1
Circular waveguide antenna and circular waveguide array antenna
InactiveUS20100231475A1Low priceLoss of characteristicWaveguide hornsAntenna arraysReflection lossLength wave
A low-cost, compact circular waveguide array antenna which improves an antenna reflection loss characteristic and enables an improvement in radiation characteristics, particularly radiation gain. The circular waveguide array antenna includes feeding portions which feed electromagnetic waves to one ends of circular waveguides and radiation apertures which radiate the electromagnetic waves at the opposite ends. Each circular waveguide includes a conical horn, with a diameter of a feeding side aperture at the feeding portion end being a, a diameter of the radiation aperture being d, which is larger than the diameter a of the feeding side aperture, and an opening angle being 2α. If a wavelength of a central frequency of an employed frequency band is λ, then a value of α, which is half of the opening angle 2α, is set between 0.8×Arcsin(0.1349114 / (d / λ)) and 1.2×Arcsin(0.1349114 / (d / λ)).
Owner:OKI ELECTRIC IND CO LTD +1
Millimeter wave rectangular-circular transition integrated corrugated horn antenna and processing method
InactiveCN101662072AAvoid discontinuitiesSmall VSWRWaveguide hornsWaveguide type devicesHorn antennaStanding wave ratio
The invention discloses a millimeter wave rectangular-circular transition integrated corrugated horn antenna and a processing method and adopts integrated disposable electroforming for processing. A shell is internally provided with an inner cavity communicating from top to bottom in the shell, and the inner cavity consists of a corrugated inner wall radiation section, a circular waveguide extension section, a rectangular-circular transition waveguide section and a rectangular waveguide extension section from top to bottom, and one end of the port of the rectangular waveguide extension sectionin the shell is assembled with a connection part through sleeve joint. The corrugated horn antenna is electroformed by an inner core with the structure the same as that of the inner cavity, the integrated structure is adopted instead of various independent parts, the discontinuity of inner section change and deteriorated smoothness of a transition part caused by the processing dimension difference of all components, assembly and positioning error and other reasons are avoided, voltage standing wave ratio is reduced and antenna performance is improved, and compared with the traditional discrete part scheme, the scheme also reduces the requirement on processing accuracy properly. In the invention, the antenna performance, production technology complexity and time cost are all improved.
Owner:BEIHANG UNIV
Ultrathin microwave antenna with ultra high performance
The invention discloses an ultrathin microwave antenna with ultra high performance, comprising a main reflecting surface, a secondary metal reflecting surface, a metal feed circular waveguide and a medium conical horn feed source, and all the components have the same rotary symmetry axis; the secondary metal reflecting surface is tightly connected with the metal feed circular waveguide by the medium conical horn feed source and is connected with the main reflecting surface; the bottom of the medium conical horn feed source is provided with a prolonging edge used for reflecting the surface wave energy of the medium conical horn feed source to further improve antenna gain; the sloping side of the medium conical horn feed source is provided with a plurality of outward or inward steps so as to ensure that the whole antenna has favourable matching, the whole surface antenna is convenient to process, and the yield is high.
Owner:北京天瑞星际技术有限公司
Integrated single-piece antenna feed
The invention is an integrated single-piece antenna feed, turnstile polarizer and antenna system suitable for satellite communications. One embodiment of the integrated single-piece antenna includes a circular waveguide input, a circular polarizer, a coaxial feed horn, subreflector and subreflector support. One embodiment of the circular polarizer features four branches of wrapped-single-ridged waveguide.
Owner:OPTISYS INC
Circularly polarized receive/transmit elliptic feed horn assembly for satellite communications
The present invention provides a feed horn for use in an antenna assembly having a non-circular reflector. The feed horn is capable of transmitting and receiving circularly polarized signals. The feed horn includes a circular waveguide section for connection to a transmitter and receiver of the antenna assembly. A conical waveguide section is connected to an opposed end of the circular waveguide section for creating a smooth transition from the circular waveguide section to a non-circular corrugated waveguide section. The corrugated waveguide section includes a plurality of corrugations that transition for a circular shape adjacent to the conical waveguide section to an increasing non-circular shape at an end proximal to the reflector of the antenna assembly. The corrugations have individuals depths defined in the inner wall of the corrugated waveguide section. These depths compensate circularly polarized signals propagating in the feed horn for distortions due to the non-circular reflector.
Owner:CPI SATCOM & ANTENNA TECH INC
Dual-band and dual-polarization millimeter wave feed source
ActiveCN104979638ASimple structureBreak through the technical problem of dual-frequency dual-polarization millimeter-wave feedWaveguide hornsSimultaneous aerial operationsLow-pass filterDual mode
The invention provides a dual-band and dual-polarization millimeter wave feed source which comprises a radiation end, a Ka-band orthogonal mode coupling and a W-band orthogonal mode coupling. The radiation end and the couplings use a waveguide structure. Dual bands and dual polarization are realized through single caliber. A high band is located in the middle. Low bands carry out feeding from sides. A high-band dual-mode feed source is connected with an external orthogonal mode coupling. The low bands carry out feeding from a circular waveguide segment with increasing diameter. The dual-polarization feed source has a simple main structure, and breaks through the technical problems of the dual-band and dual-polarization millimeter wave feed source. In order to prevent crosstalk and improve the feed source performance, a filter is added on an output rectangular waveguide segment of a low-band orthogonal mode coupling. The filter is a low-pass filter which has low-band passband and high-band stop-band. Two kinds of polarization exit waveguide of two bands are respectively located in four directions of a major radiation waveguide axis, are in pairwise orthogonal, are staggered up and down, are not located in the same level, and are easily connected with rear end waveguide.
Owner:ANHUI SUN CREATE ELECTRONICS
Small circularly-polarized horn antenna
InactiveCN103236586AGood radiation characteristicsImprove stabilityWaveguide hornsHorn antennaPolarizer
The invention discloses a small circularly-polarized horn antenna and mainly solves the problem that the prior art cannot simultaneously meet requirements of high power, high gain, wide band and circular polarization. The small circularly-polarized horn antenna comprises a coaxial-circular waveguide converter (1), a circular polarizer (2), a conical horn (3), a dielectric lens (4) and a circular waveguide (7), the circular polarizer (2) is mounted inside the circular waveguide (7) which is directly connected with the conical horn (3), the dielectric lens (4) is fixed in front of the conical horn (3), the conical-circular waveguide converter is mounted on the side wall of the circular waveguide (7), the circular polarizer (2) is composed of a symmetric hexagonal dielectric inserting piece (5) and two rectangular compensation grooves (6) which are fixed inside the circular waveguide (7), and the two compensation grooves are symmetrically arranged right above and right below of the dielectric inserting piece (5) inside the circular waveguide (7). The small circularly-polarized horn antenna has the advantages of wide band, good stability, high gain, large power capacity and good circular polarization characteristic.
Owner:XIDIAN UNIV
Circular to rectangular waveguide converter including a bend section and mode suppressor
ActiveUS20080186113A1Avoid excessive interactionTransmission is requiredMultiple-port networksCoupling devicesTransformerSuppressor
A compact circular waveguide system can connect circular waveguides through a bend while avoiding excessive interaction between the orthogonal modes of the circular waveguides. A compact bend system with circular waveguide input and output can be achieved by providing short quarter wave transformers. The quarter wave transformers can be positioned at the transitions between the circular waveguides and a single-mode quasi-rectangular waveguide segment. Within the single-mode quasi-rectangular waveguide segment, a bend can be formed without concern for mixing of the orthogonal modes of the circular guided wave. The undesired mode of propagation can be substantially reduced or eliminated within the quarter wave transformers with a resistive mode suppressor. The compact system can be machined out of a single block of material from the outside flange faces.
Owner:EMS TECHNOLOGIES
Large diameter D-shaped optical waveguide and coupler
InactiveUS6996316B2Easy to useEasy to manufactureLaser using scattering effectsOptical fibre with multilayer core/claddingGratingRare earth
A large diameter D-shaped optical waveguide device 9, includes an optional circular waveguide portion 11 and a D-shaped waveguide portion 10 having at least one core 12 surrounded by a cladding 14. A portion of the waveguide device 9 has a generally D-shaped cross-section and has transverse waveguide dimension d2 greater than about 0.3 mm. At least one Bragg grating 16 may be impressed in the waveguide 10 and / or more than one grating or pair of gratings may be used and more than one core may be used. The device 9 provides a sturdy waveguide platform for coupling light into and out of waveguides and for attachment and alignment to other waveguides, for single and multi-core applications. The core and / or cladding 12,14 may be doped with a rare-earth dopant and / or may be photosensitive. At least a portion of the core 12 may be doped between a pair of gratings 50,52 to form a fiber laser or the grating 16 or may be constructed as a tunable DFB fiber laser or an interactive fiber laser within the waveguide 10. The waveguide may resemble a short “block” or a longer “cane” type, depending on the application and dimensions used.
Owner:CIDRA CORP SERVICES
High-power microwave phase shifter
The invention relates to the technical field of communication devices, in particular to a high-power microwave phase shifter which comprises a rectangular waveguide, a circular waveguide placed on an E face of the rectangular waveguide, and mode-converting and circular polarization units placed on other faces of the rectangular waveguide. A short-circuiting piston which can move in the direction of the axis of the circular waveguide is arranged in the circular waveguide. The mode-converting and circular polarization units are used for converting TE10 mode microwaves into two orthogonal-polarization TE11 mode microwaves which are the same in amplitude and have 90-degree phase difference, and the mode microwaves are input to the circular waveguide. Due to the fact that the high-power microwave phase shifter can achieve phase shifting without ferrite materials, the size and loss of the phase shifter can be lowered, and meanwhile the whole high-power microwave phase shifter can be made of metal materials, and accordingly high-power capacity can be achieved.
Owner:NORTHWEST INST OF NUCLEAR TECH
Microwave applicator, plasma processing apparatus having same, and plasma processing method
InactiveUS6870123B2Easy to controlImprove uniformityVacuum evaporation coatingSputtering coatingControllabilityPlasma processing
In order to more accurately control the radiation characteristics of microwaves to improve the controllability of processing in radial and circumferential directions of an article, there are disclosed a microwave applicator and a plasma processing apparatus using the applicator, which comprise a circular waveguide having a surface provided with a plurality of slots for radiating microwaves, wherein the centers of the plurality of slots are offset in a direction parallel to the surface with respect to the center of the circular waveguide.
Owner:CANON KK
High-power laser system having delivery fiber with non-circular cross section for isolation against back reflections
ActiveUS20110249319A1Reduce lightEasy to replaceFibre transmissionActive medium shape and constructionHigh power lasersAudio power amplifier
An apparatus and method that provide optical isolation by permitting substantially all forward-propagating light into a delivery fiber from an optical amplifier and substantially preventing backward-traveling light from the delivery fiber entering the optical amplifier without the use of a conventional optical isolator. Eliminating the isolator improves efficiency and reduces cost. Some embodiments use a delivery fiber having a non-circular core in order to spread a single-mode signal into multiple modes such that any backward-propagating reflection is inhibited from reentering the single-mode amplifier. Some embodiments amplify an optical signal in a gain fiber having an output end, output the forward-propagating amplified signal as a high-brightness optical beam (having a first Rayleigh range) into a removable delivery fiber having a non-circular waveguide, output the amplified signal from a distal end of the delivery fiber, and, without the use of a non-linear optical isolator, inhibit backward-propagating light from re-entering the gain fiber.
Owner:LOCKHEED MARTIN CORP
Split ring metamaterial unit-based dual-frequency circularly polarized plane reflective array antenna
ActiveCN106532274AMeet application needsOverall small sizeRadiating elements structural formsPolarised antenna unit combinationsDielectric substrateMetamaterial
Owner:SHANGHAI RADIO EQUIP RES INST
Microwave resonance cavity
InactiveCN101127413AImprove large-area processing capabilitiesEasy to disassembleResonatorsPlasma techniquePhysicsCircular waveguide
The utility model discloses a microwave resonant cavity, comprising a coaxial waveguide and a medium window, wherein the coaxial waveguide 200 is an integrative unit comprising a circular waveguide tube and a conical waveguide tube; a flange 700 is fixed below the coaxial waveguide and is provided with a circular window at the center; a sealing groove 903 is arranged on the outer side of the window; a sealing ring is arranged in the sealing groove ; the medium window 902is fixed on the sealing ring; a fixed rubber ring 901 is fixed between the inner wall of the medium window and the flange; the medium window is provided with a non-magnetic tray 600, the internal conductor 502 of the coaxial waveguide is connected with the non-magnetic tray 600 through a choke 800; the upper external edge of the flange is in thread connection with the lower external edge of the external conductor of the coaxial waveguide; and the lower external edge of the flange is connected with the upper external edge of the craft chamber through thread. The utility model has the advantages of even distribution of the microwave electric field, big chamber processing size and easy disassembly and maintenance and is used for providing microwave electric field for the electron cyclotron resonance plasma devices.
Owner:XIDIAN UNIV
Glass melting apparatus and glass melting method
There are provided a glass melting apparatus and a glass melting method which are capable of uniformly melting glass materials and shortening or dispensing with a fining process. The glass melting apparatus 200 is comprised of an oscillator 201 having a gyrotron 202 disposed therein for emitting high-frequency waves of 28 GHz, a circular waveguide 203 for transmitting the millimeter waves from the oscillator 201, an applicator 204 having a ceramic furnace 111 disposed therein, and a CPU 205 controlling a thermocouple 206 for measuring the temperature of molten glass within the furnace 111 and a power supply panel 207 for supplying electric power to the oscillator 201. The furnace 111 has an upper part thereof formed with a batch inlet port 112 through which a mixture of glass materials (hereinafter referred to as “the batch”) is charged, and a lower part thereof formed with an outlet end 113 through which the batch melted uniformly by dielectric heating within the furnace 111 is dropped into a bus 121.
Owner:NIPPON SHEET GLASS CO LTD
Microwave ionization type plasma thruster
ActiveCN105934063AImprove the ionization effectPower optimizationMachines/enginesUsing plasmaThroatMicrowave
The invention discloses a microwave ionization type plasma thruster. The microwave ionization type plasma thruster comprises a tubular enclosure, a circular waveguide tube and a tubular working cavity. The waveguide tube is connected with the position of the central axis at the front end of the tubular working cavity. A coupler and a ceramic window are arranged on the waveguide tube. Gas importing tubes are arranged at the periphery of the waveguide tube. The gas importing tubes are connected with the working cavity. A set of intra-magnetic filed coils are mounted at the position of the central axis in the working cavity. The front end panels of the working cavity are anode plates. A throat structure is employed at the tail end of the working cavity. The tail end is connected with emitting cathodes. The tubular enclosure is mounted at external part of the working cavity. Resonant magnetic field coils and rotating magnetic field coils are mounted on the enclosure in a front and back sequence. The rotating magnetic field coils are close to the tail end of the working cavity. The rotating magnetic field coils are movably mounted on the enclosure and can rotate under drive of a motor. The plasma thruster has the advantages that the thrust amplitude is adjustable, and the ionization and acceleration processes are separately operated.
Owner:台州星空智联科技有限公司
Distributed amplification gyro traveling wave tube amplifier
InactiveCN102044398AImprove stabilityImprove toleranceTravelling-wave tubesTransit-tube circuit elementsHigh energyLinear amplification
The invention discloses a distributed amplification gyro traveling wave tube amplifier, which consists of two sections, namely a linear amplification section with a structure alternatively loading by using a smooth circular waveguide and a loss medium waveguide and a nonlinear amplification section of the smooth circular waveguide, wherein the smooth circular waveguide in the linear section is synchronous to electron beams so as to generate electronic cyclotron maser interaction; a mode in the loss medium waveguide is asynchronous to the electron beams, so that net energy exchange does not exist and a high-frequency field is absorbed by a lossy material; and the electron beams interact in the smooth waveguide and drift in the loss waveguide. Therefore, the linear section is a pre-bunchingsection with high stability. Cyclotron electron beams are fully modulated by driven power in the linear section, well-bunched electron beams intensely act with a working mode in the nonlinear sectionand transverse kinetic energy is converted into microwave energy, so that high-energy microwave output is obtained. The loss medium waveguide of the linear section can effectively absorb a competition mode so as to ensure the stability of a device. The nonlinear section works by using pre-bunched electron beams, so that high power, high stability and high efficiency are achieved.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
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