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30results about How to "Improve selection features" patented technology
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Multi-branch loading-based three passband high-temperature superconductive filter
InactiveCN103367844AMiniaturizationImprove selection featuresResonatorsFeed lineHigh-temperature superconductivity
A multi-branch loading-based three passband high-temperature superconductive filter is characterized in that four open circuit branches and one short circuit branch are loaded on a uniform impedance resonator, wherein the short circuit branch is loaded at the middle position point of the uniform impedance resonator; the first and third open circuit branches are loaded on the uniform impedance resonator by being symmetrical about the short circuit branch; the second and fourth open circuit branches are loaded on the uniform impedance resonator by being symmetrical about the short circuit branch, and are the same as or opposite to the direction of the first and third open circuit branches on the uniform impedance resonator; an incoming feeder and an outgoing feeder are coupled with the branch loaded uniform impedance resonator by gaps; and the incoming and outgoing feeders are coupled in an interdigital manner. The multi-branch loading-based three passband high-temperature superconductive filter realizes the control on the band pass position and band width of the filter, is capable of effectively reducing the number of the resonators, and effectively improving the stop band property of the filter, has the good characteristics of linear phase and steep out-of-band property, and realizes the miniaturization of the filter.
Owner:EAST CHINA JIAOTONG UNIVERSITY
High performance frequency selective surface based on integrated waveguide multi-cavity cascade
InactiveCN1937307AImprove selection performanceImprove selection featuresWaveguide type devicesSatelliteMultiple frequency
Integrated wave-guide multicavity-cascaded frequency selection surface on base plate in high performance can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in communication system of satellite, radar etc. Pressing multiplayer microwave plates produces the frequency selection surface. The said surface includes following parts: outer up and low metal surfaces, middle metal surfaces in multi-layer, and intermediate media layer for filling gap between metal surfaces; etching out'#'shaped slot in large size on outer up and low metal surfaces, and etching out'#'shaped slot in small size on middle metal surfaces in multi-layer with their central positions being coincided each other; finally, a series of metalized through holes with even interval surrounding each slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate of traditional metal cavity. The invention raises selectivity characteristic greatly.
Owner:SOUTHEAST UNIV
Ultra wide band bandpass filter with notch property
The invention provides an ultra wide band bandpass filter with a notch property. The ultra wide band bandpass filter comprises a T-shaped stub-loaded resonator, a first open ring resonator, a second open ring resonator, an input feeder line and an output feeder line. The input feeder line and the output feeder line are connected at left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the T-shaped stub-loaded resonator. The first open ring resonator and the second open ring resonator are symmetrically arranged at the left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the left and right sides of the T-shaped stub-loaded resonator. Through adoption of the T-shaped stub-loaded resonator, the bandwidth of a passband can be controlled well, a zero point is respectively generated at two sides of the passband, and the selectivity of the passband is improved. Through adoption of the open ring resonators, a notch stopband is generated, a location of center frequency of the stopband can be adjusted conveniently, the zero point is respectively generated at two sides of the stopband, and the selectivity of the stopband is improved.
Owner:XI AN JIAOTONG UNIV
Tri-band planar filter based on multi-mode resonators
PendingCN109713409AReduce volumeIncreased Design FreedomWaveguide type devicesDual modeBand-pass filter
The invention discloses a tri-band planar filter based on multi-mode resonators. The tri-band planar filter is manufactured on a double-sided copper-clad micro-strip board in the form of a printed circuit board. One surface of the double-sided copper-clad micro-strip board is a micro-strip wiring layer, and the other surface of the double-sided copper-clad micro-strip board is a copper-clad grounding board. A dielectric layer is arranged in the middle of the double-sided copper-clad micro-strip board. A feeder line, a first multi-mode resonator arranged above the feeder line and a second multi-mode resonator arranged below the feeder line are manufactured on the micro-strip wiring layer. The first multi-mode resonator and the second multi-mode resonator are independently adjustable. The two feeders form a left-right mirror symmetry structure and are coupled with each other through a gap between the two feeders. The first multi-mode resonator is a double-frequency four-mode resonator composed of a first resonant body, a T-shaped loading branch and two open circuit loading branches. The second multi-mode resonator is a single-frequency dual-mode resonator composed of a second resonant main body and an inverted T-shaped loading branch. The tri-band planar filter based on multi-mode resonators has the advantages of simple structure, flexible design, convenient debugging, small sizeand the like.
Owner:SOUTH CHINA UNIV OF TECH
Dual-band band-rejection filter based on defected microstrip structure and defected ground structure
ActiveCN104966873AImprove selection featuresImprove performanceWaveguide type devicesDielectric substrateEngineering
The invention discloses a dual-band band-rejection filter based on a defected microstrip structure and a defected ground structure, and the filter comprises a dielectric substrate (1), a metal coating grounding plate (2) disposed on the dielectric substrate (1), and a metal microstrip line (3) disposed on the dielectric substrate (1). The metal coating grounding plate (2) and the metal microstrip line (3) are respectively provided with a delta-shaped defected structure in an etched manner. The metal coating grounding plate (2) and the metal microstrip line (3) are respectively provided with one delta-shaped defected structure in the etched manner, thereby forming the filter, and effectively improving the selectivity of the filter. In addition, the center frequencies of two stop bands of the filter can be adjusted independently through the change of the lengths of the defected microstrip structure and defected ground structure, and two widths can be adjusted independently through the change of the tilt width of the defected microstrip structure and defected ground structure.
Owner:NORTHEASTERN UNIV
Three-screen double-passband high-selectivity frequency selective surface and design method thereof
The invention discloses a three-screen double-passband high-selectivity frequency selective surface and a design method thereof. The frequency selective surface comprises a first metal patch layer, a first dielectric layer, a second metal patch layer, a second dielectric layer and a third metal patch layer which are sequentially pressed together; the first metal patch layer and the third metal patch layer are both composed of a first square loop and a second square loop, the first square loop is larger than the second square loop, the two loops are nested, and a gap exists between the two loops. The second metal patch layer is composed of a third square loop and a fourth square loop, the third square loop is larger than the fourth square loop, the two loops are nested, and a gap exists between the two loops. High-order resonance is achieved in a multi-screen cascade mode, sideband roll-off is accelerated while low insertion loss is guaranteed, multiple transmission zeros are obtained outside a passband through the multi-loop resonance design, stopband bandwidth is superposed, the suppression is improved, and therefore the structure obtains the high selection characteristic. And electromagnetic waves with different frequencies can be efficiently and accurately separated in a complex environment.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Novel coupling network based planar CQ diplexer
InactiveCN106058391AImprove selection featuresImprove isolationWaveguide type devicesCouplingNetwork structure
The invention discloses a microstrip aided and novel coupling network based planar CQ diplexer, which comprises a band-pass filter with symmetrical CQ structures at left and right and a new coupling network. The planar CQ diplexer proposed by the invention has a novel coupling network structure and can be widely used in the design of various types of duplexers. With the adoption of a filter with a compact CQ structure, it is possible not only to make a diplexer highly selective, but also to ensure good isolation. As the duplexer is designed with a microstrip structure, it is light in weight, low in cost, and suitable for industrial mass production. Therefore, the duplexer is advantageous for its simple structure, easy design, and low manufacturing cost.
Owner:SOUTH CHINA UNIV OF TECH
Fuse type load disconnection switch
InactiveCN104867776AProtectObvious current limiting characteristicsElectrical apparatusEngineeringSpring steel
The invention relates to a fuse type load disconnection switch. A spring energy storage operating mechanism is composed of a handle, a support, a main shaft, a shaft sleeve, a spring leaf in the shaft sleeve, a fastener, stop blocks, a pull bar and the like. A switch body is composed of an insulating base plate, a support member, an arc extinguishing shield, main contacts, steel spring rings (or sheet spring steel), a crossbeam, a blade assembly, flash barriers, a guide rail and the like. The handle is pushed or pulled to drive the main shaft, the main shaft drives the spring leaf in the shaft sleeve, energy storage of the spring in the shaft sleeve is completed when the main shaft rotates to a certain position, under the elastic force of the spring leaf, the shaft sleeve rapidly rotates to drive a link rod welded to the shaft sleeve, the link rod drives the pull bar fixed to the crossbeam of the switch, and the pull bar drives the crossbeam and the blade assembly fixed to the crossbeam to slide rapidly up and down in the guide rail to realize rapid closing and opening of the switch.
Owner:杨顺杰
Preparation method for anti-dielectric substrate delamination of multi-layer fss radome
ActiveCN105186131BAvoid the effects of differences in expansion coefficientsImprove selection featuresRadiating element housingsRelational modelDielectric substrate
The invention discloses a preparation method for anti-dielectric substrate delamination of a multi-layer FSS radome. Before the radome is laminated, the polyimide frequency selective surface is plasma activated and the cyanate resin is sprayed for viscosity-increasing treatment; Quantitatively describe the influence of curing process parameters on the internal stress, establish the relationship model between the internal stress of the multilayer frequency selective surface stealth radome and the curing process parameters, and then make the polyimide frequency selective surface into prepreg; select according to the multilayer frequency The circuit design of the surface stealth radome requires the frequency selective surface and the layup sequence design of the composite material dielectric layer, and the layup is carried out according to the layup sequence; after the layup is completed, the autoclave is formed and cured. The invention makes up for the defect that air bubbles are easily trapped when the polyimide frequency selective surface and the dielectric layer prepreg are laminated in the traditional method, and solves the problem that the air bubbles cannot be excluded due to the barrier of the frequency selective surface when the dielectric layer is formed, and separation will occur. layer problem.
Owner:10TH RES INST OF CETC
Millimeter-wave broadband band-pass filter
InactiveCN103474725AReduce volumeEasy to processWaveguide type devicesSoftware engineeringBand-pass filter
The invention discloses a millimeter-wave broadband band-pass filter which is applicable to a 25-50 GHz frequency band and based on substrate-integrated waveguides. The filter includes a serially connected high-pass filter and low-pass filter and a cascade matching circuit arranged between the high-pass filter and the low-pass filter. A cut-off frequency of the high-pass filter is lower than a cut-off frequency of the low-pass filter. The high-pass filter includes substrate-integrated waveguides (1) and the low-pass filter includes compact microstrip resonance units (2). The cascade matching circuit is two sections of matching circuits (3). The millimeter-wave broadband band-pass filter applies the substrate-integrated waveguides and realizes a filtering function through a filter cascade method. The filter is simple in structure, visually observable, planar in structure, small in size, convenient to manufacture and convenient for integration of other circuits.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
5G communication-oriented polarization-independent silicon-based optical wavelength division multiplexing receiver and device
PendingCN113759466AReduce volumeLow costCoupling light guidesOptical waveguide light guideMultiplexingGrating
The invention discloses a polarization-independent silicon-based optical wavelength division multiplexing receiver and device for 5G communication. The receiver comprises a two-dimensional grating coupler for receiving optical signals, an optical cross connector, two multimode interference couplers, a bidirectional angle multimode interference coupler optical wavelength division multiplexing device and a germanium waveguide detector. According to the receiver, sensitivity to the polarization state of the optical signal is effectively improved, optical loss can be reduced, and the bit error rate is reduced.
Owner:苏州微光电子融合技术研究院有限公司
Millimeter waveband filter and method of increasing rejection band attenuation
ActiveUS20140015626A1Arbitrary shapeImprove selection featuresWaveguide type devicesUltrasound attenuationResonance
A millimeter waveband filter is provided with a resonator formed by a pair of electric wave half mirrors in a transmission line of a waveguide allowing electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode, and allows frequency components centering on the resonance frequency of the resonator to pass therethrough. A high-pass filter which has a transmission line reduced in size so as to have a cutoff frequency matching an upper limit of a lower rejection band of a filter passband is formed in a transmission line between the end of the waveguide and the electric wave half mirror, thereby increasing the attenuation of the lower rejection band.
Owner:ANRITSU CORP
A slot-based balanced filter with high selectivity and wide stopband
ActiveCN110137644BImprove selection featuresReduce areaWaveguide type devicesSplit ringDielectric substrate
The invention belongs to the technical field of balance filters, and discloses a high-selectivity wide-stopband balance filter based on a slot line. The high-selectivity wide-stopband balance filter comprises a microstrip, a dielectric substrate and a conductive layer which are arranged successively. A slot line is etched on the conductive layer to form a passband selection module and a stopband suppression module. The passband selection module comprises two open ring resonators symmetrically arranged in a horizontal direction. The coupling end of one open ring resonator serves as the signal feed-in end of the passband selection module. The coupling end of the other open ring resonator serves as the signal feed-out end of the passband selection module. The stopband suppression module comprises two slot line [pi]-type networks symmetrically arranged in the vertical direction, wherein one slot line [pi]-type network is connected to the signal feed-in end of the passband selection module,and the other slot line [pi]-type network is connected to the signal feed-out end of the passband selection module. The high-selectivity wide-stopband balance filter achieves a wide stopband and highpassband selectivity by using a second-order resonant circuit composed of the slot line [pi]-type networks and the two slot line open ring resonators.
Owner:HUAZHONG UNIV OF SCI & TECH
Filter power divider based on half-mode substrate integrated waveguide
ActiveCN109301422BHigh quality factorImprove isolation characteristicsCoupling devicesElectrical resistance and conductanceDielectric substrate
The present invention proposes a filter power divider based on half-mode substrate integrated waveguide, which takes the substrate integrated waveguide rectangular cavity and the half-mode substrate integrated waveguide rectangular cavity as the basic resonant unit, and the adjacent rectangular cavities are realized by opening windows Magnetic coupling, open S-shaped slots to realize electrical coupling, there is a jumper isolation resistor between the openings of the second-order half-mode substrate integrated waveguide rectangular cavity, slot lines are set at the corresponding positions between the metal conductive layer on the lower surface and the opening, and the input and output terminals use Microstrip-coplanar waveguide structure. The substrate-integrated waveguide rectangular cavity includes a dielectric substrate whose upper and lower surfaces are covered with metal conductive layers, and the dielectric substrate is evenly distributed along the edge of the cavity with metal through holes penetrating the upper and lower metal conductive layers; the half-mode substrate integrated waveguide rectangular cavity consists of The substrate-integrated waveguide rectangular cavity is obtained by dividing along the magnetic wall. The invention has a compact structure and improves the isolation characteristic and out-of-band suppression performance of the filter power divider.
Owner:NANJING UNIV OF SCI & TECH
Tri-Band Monopole Antenna
InactiveCN103762417BSmall sizeReduce volumeSimultaneous aerial operationsRadiating elements structural formsCouplingAntenna feeder
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
A current double-loop control method for active power filter based on mixed load
ActiveCN113839388BSuppress resonanceGuaranteed harmonic compensation effectActive power filteringAc-dc conversionHybrid typeLoop control
The invention relates to a current double-loop control method of an active power filter based on a mixed load. The control method is based on a mixed-load active power filter system current double-loop control system and an equivalent model of a harmonic amplification phenomenon established by the system. The method includes Compensation current outer loop control and damping inner loop control, harmonic current controller adopts proportional vector resonant controller, fundamental wave current controller adopts proportional resonant controller, DC voltage controller adopts proportional integral controller, damping inner loop adopts proportional Control mode, the invention can well compensate the harmonics of the harmonic amplification phenomenon caused by the hybrid nonlinear load, and at the same time suppress the resonance problem of the LCL filter, ensure the harmonic compensation effect of the APF, and enhance the stability of the system , and the harmonic compensation and DC side voltage regulation of the APF can be independently controlled.
Owner:HUBEI UNIV OF TECH
Ultraviolet photodetector and preparation method based on single twin structure gan nanowire
ActiveCN107819046BLarge specific surface areaHigh absorbance coefficientSemiconductor devicesNanowireManufacturing technology
The invention belongs to the field of photoelectric detectors and specifically relates to a single root twin structure GaN nano wire-based ultraviolet light photoelectric detector and a preparation method therefor. The detector comprises an Si substrate, an SiO2 insulating layer, a single root twin structure GaN nano wire on the insulating layer and metal electrodes covering two ends of the singleroot twin structure GaN nano wire that are orderly arranged from bottom to top. The twin structure GaN nano wire in the ultraviolet light photoelectric detector is high in specific surface area, andseparation and rapid transport of photo-generated carriers can be effectively realized via a twin structure; high optical responsivity, external quantum efficiency and photoelectric current gains canbe achieved. More importantly, the ultraviolet light photoelectric detector is high in selectivity concerning ultraviolet light in a UV-A wave band. The ultraviolet light photoelectric detector is simple in manufacture technology, low in cost, high in sensitivity and stable in performance.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Millimeter waveband filter and method of increasing rejection band attenuation
ActiveUS8970321B2Arbitrary shapeImprove selection featuresCoupling devicesUltrasound attenuationResonance
Owner:ANRITSU CORP
Dual-band Band-Stop Filter Based on Defective Microstrip Structure and Defective Ground Structure
ActiveCN104966873BImprove selection featuresReduce volumeWaveguide type devicesDielectric substrateBand-stop filter
The invention discloses a dual-band band rejection filter based on a defective microstrip structure and a defective ground structure, comprising: a dielectric substrate (1), a metal-coated grounding plate (2) arranged on the bottom surface of the dielectric substrate (1), and a The metal microstrip line (3) on the substrate (1), the ground plate (2) and the microstrip line (3) are all etched with δ-shaped defect structures. The present invention constitutes a dual-band band-stop filter by using a ground plate and a microstrip line etched with a δ-shaped defect structure, thereby effectively improving the selection characteristics of the dual-band band-stop filter; in addition, the dual-band band-stop filter of the present invention The center frequencies of the two stopbands can be independently adjusted by changing the lengths of the defect microstrip structure and the defect ground structure, and the two bandwidths can be independently adjusted by changing the gap widths of the defect microstrip structure and the defect ground structure.
Owner:NORTHEASTERN UNIV LIAONING
A UWB Bandpass Filter with Notch Characteristic
Owner:XI AN JIAOTONG UNIV
mmWave broadband bandpass filter
The invention discloses a millimeter-wave broadband band-pass filter based on a substrate integrated waveguide suitable for the 25-50 GHz frequency band, including a high-pass filter, a low-pass filter and a cascaded matching between the two in series circuit, the cut-off frequency of the high-pass filter is lower than the cut-off frequency of the low-pass filter, the high-pass filter is composed of a substrate integrated waveguide (1), the low-pass filter is composed of a compact microstrip resonant unit (2), cascaded The matching circuit is a two-section matching circuit (3). The millimeter-wave broadband bandpass filter of the present invention uses a substrate integrated waveguide and realizes the filtering function through a filter cascading method.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
A Planar CQ Duplexer Based on Novel Matching Network
InactiveCN106058391BImprove selection featuresImprove isolationWaveguide type devicesCouplingNetwork structure
The invention discloses a microstrip aided and novel coupling network based planar CQ diplexer, which comprises a band-pass filter with symmetrical CQ structures at left and right and a new coupling network. The planar CQ diplexer proposed by the invention has a novel coupling network structure and can be widely used in the design of various types of duplexers. With the adoption of a filter with a compact CQ structure, it is possible not only to make a diplexer highly selective, but also to ensure good isolation. As the duplexer is designed with a microstrip structure, it is light in weight, low in cost, and suitable for industrial mass production. Therefore, the duplexer is advantageous for its simple structure, easy design, and low manufacturing cost.
Owner:SOUTH CHINA UNIV OF TECH
A ku-band ultra-narrowband microstrip bandpass filter
InactiveCN104810581BAdjustable lengthImprove selection featuresWaveguide type devicesBandpass filteringCoupling
Owner:NANJING UNIV OF SCI & TECH
Dual-mode and dual-frequency coaxial cavity filter
PendingCN110429361AAchieving dual frequency featuresImprove selection featuresWaveguide type devicesDual frequencyResonant cavity
The invention discloses a dual-mode dual-frequency coaxial cavity filter. The dual-mode and dual-frequency coaxial cavity filter comprises a metal cavity and input / output ports; the structure in the metal cavity is linearly distributed and comprises a first coaxial resonant cavity, a first coupled resonant window, a second coaxial resonant cavity, a second coupled resonant window and a third coaxial resonant cavity. The first, second and third coaxial resonant cavities are respectively internally provided with vertical metal cylinders and horizontal metal cylinders, the first and second coupled resonant windows are both formed by coupling structures and coupling windows, and there are the two input / output ports which are both coaxial feed lines and are respectively extended and inserted into the vertical metal cylinders of the first and third resonant cavities. On the basis of the traditional conventional coaxial filter, the two metal cylinders can respectively control the first resonant frequency and the second resonant frequency of the resonant cavities by adding the metal cylinders in the horizontal direction to achieve dual frequency characteristics, and the dual-mode dual-frequency coaxial cavity filter is simple and compact in structure, miniaturized, easy to tune, wide in bandwidth and good in selectivity.
Owner:SOUTH CHINA UNIV OF TECH
High-selectivity wide-stopband balance filter based on slot line
ActiveCN110137644AImprove selection featuresReduce areaWaveguide type devicesDielectric substrateEngineering
The invention belongs to the technical field of balance filters, and discloses a high-selectivity wide-stopband balance filter based on a slot line. The high-selectivity wide-stopband balance filter comprises a microstrip, a dielectric substrate and a conductive layer which are arranged successively. A slot line is etched on the conductive layer to form a passband selection module and a stopband suppression module. The passband selection module comprises two open ring resonators symmetrically arranged in a horizontal direction. The coupling end of one open ring resonator serves as the signal feed-in end of the passband selection module. The coupling end of the other open ring resonator serves as the signal feed-out end of the passband selection module. The stopband suppression module comprises two slot line [pi]-type networks symmetrically arranged in the vertical direction, wherein one slot line [pi]-type network is connected to the signal feed-in end of the passband selection module,and the other slot line [pi]-type network is connected to the signal feed-out end of the passband selection module. The high-selectivity wide-stopband balance filter achieves a wide stopband and highpassband selectivity by using a second-order resonant circuit composed of the slot line [pi]-type networks and the two slot line open ring resonators.
Owner:HUAZHONG UNIV OF SCI & TECH
Method for detecting ethanol by indium oxide-based folded microspheres and application of indium oxide-based folded microspheres
PendingCN113189148AResponse recovery time is shortImprove featuresGallium/indium/thallium compoundsMaterial resistanceIndiumMicrosphere
The invention belongs to the technical field of semiconductor oxide gas sensors, and discloses a method and application for detecting ethanol by indium oxide-based folded microspheres. The method comprises the following steps: weighing In(NO3)3, dispersing the In(NO3)3 in deionized water, and stirring until the solution is transparent; adding the solution into an atomization device in spray pyrolysis, and setting N2 as carrier gas; after the solution completely reacts, collecting a terminal reaction product, cleaning, drying and calcining; ultrasonically dispersing a sensitive material in deionized water, coating a ceramic tube of the sensor with a brush, and calcining; welding a sensitive electrode and a heating wire on a hexagonal base, aging, and starting a test after the resistance of a device is stable. According to the In2O3 folded microspheres provided by the invention, through a spray pyrolysis method and inheritance, the response recovery time of a sensor can be shortened, the selection characteristic and sensitivity of the sensor are improved, the moisture resistance of the sensor is improved, and a new thought is provided for synthesizing a nano material.
Owner:西安电子科技大学芜湖研究院 +1
High performance frequency selective surface based on integrated waveguide multi-cavity cascade
InactiveCN1937307BHigh selectivityImprove selection featuresWaveguide type devicesCommunications systemMicrowave
Integrated wave-guide multicavity-cascaded frequency selection surface on base plate in high performance can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in communication system of satellite, radar etc. Pressing multiplayer microwave plates produces the frequency selection surface. The said surface includes following parts: outer up and low metal surfaces,middle metal surfaces in multi-layer, and intermediate media layer for filling gap between metal surfaces; etching out'#'shaped slot in large size on outer up and low metal surfaces, and etching out'#'shaped slot in small size on middle metal surfaces in multi-layer with their central positions being coincided each other; finally, a series of metalized through holes with even interval surroundingeach slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate of traditional metal cavity. The invention raises selectivity characteristic greatly.
Owner:SOUTHEAST UNIV
A frequency selective surface with three screens and two passbands with high selectivity and its design method
The invention discloses a three-screen dual-passband high-selectivity frequency selection surface and a design method thereof. The frequency selection surface comprises: a first metal patch layer, a first medium layer, a second metal patch layer, and a second medium layer and the third metal patch layer, and press them together in sequence; the first and third metal patch layers are composed of first and second square loops, the first square loop is larger than the second square loop, The two loops are nested, and there is a gap between them; the second metal patch layer is composed of third and four square loops, the third square loop is larger than the fourth square loop, the two loops are nested, and There is a gap between the two. The invention realizes high-order resonance by means of multi-screen cascading, accelerates sideband roll-off while ensuring low insertion loss, obtains multiple transmission zero points outside the passband through multi-loop resonance design, superimposes stopband bandwidth and improves suppression , so that the structure can obtain high selectivity characteristics, and can efficiently and accurately separate electromagnetic waves of different frequencies in complex environments.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Coaxial cavity duplexer
PendingCN110444845AMiniaturizationImprove selection featuresWaveguide type devicesResonant cavityResonance
The invention discloses a coaxial cavity duplexer; the coaxial cavity duplexer comprises a metal cavity and input and output ports; the metal cavity is in a convex shape, and is divided into four resonant cavities, wherein three resonant cavities protrude outwards respectively, and the left one is located in the middle; the resonant cavity in the middle part is a second-order coaxial resonant cavity, and the resonant cavities on the left side, the right side and the back part of the second-order coaxial resonant cavity are a first-order coaxial resonant cavity, and third-order coaxial resonantcavities on the right side and the back part; the first-order coaxial resonant cavity and the second-order coaxial resonant cavity are shared resonant cavities and have double-frequency characteristic; the third-order coaxial resonant cavities on the right side and the back part are single-frequency resonant cavities, and single-frequency-band parts thereof are taken out; and the four resonant cavities are coupled through a coupling resonance window; and the three input and output ports are coaxial feeder lines which are all extend into a vertical metal cylinder of the first-order coaxial resonant cavity and the resonant rods of the third-order coaxial resonant cavities on the right side and the back part. The coaxial cavity duplexer is compact in structure, miniaturized, easy to tune andhigh in selectivity.
Owner:SOUTH CHINA UNIV OF TECH
Super thin one side steep filter property frequency selecting surface
InactiveCN100433448CImprove selection featuresReduce volumeWaveguide type devicesCommunications systemMicrowave
This invented super thin single-side steep filter property frequency selection surface can be used in multiple frequency antennas of satellite, radar communication system as a frequency band multiplex machine, which is processed on a multi-layer chip with three-layers of metal faces and two dielectric layers formed by laminating two microwave plate layers, in which, the top and bottom metal surfaces are etched with periodic large square loop slots in the same size, another size of periodic small square loop slot coincident with the central position of the large one is etched on the middle metal side, two media layers are filled among the three metal surfaces, a serial metal through holes in even intervals around each of the slot unit on the laminated multi-layer chip to form a chip integrated waveguide cavity equivalent to traditional metal cavities.
Owner:SOUTHEAST UNIV
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