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75results about How to "Low loss transmission" patented technology
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Optical converter flex assemblies
InactiveUS20020126951A1Increase flexibilityLess rigidPrinted circuit assemblingHigh frequency circuit adaptationsElectricityFlexible circuits
Optical to electrical and electrical to optical conversion assemblies provide precise and stable alignment, low loss, unperturbed electrical transmission and high thermal conductivity. Mechanically isolating the ceramic substrate of the conversion assembly relative to the surrounding structures enables good long-term optical alignment. Electrical transmission line connections to and from the optical conversion circuits on the ceramic substrates are made via flexible circuit board designs. The alignment of the components on the substrate relative to the plastic optics is thus preserved. The flexible circuit board includes a cross hatched ground layer, which relieves portions of the metallization below the signal layer and yet is able to maintain the desired transmission line properties. Electrical to optical conversion circuits are provided where the transmission of the electrical signals to the converter circuits is accomplished with minimal loss and with good signal integrity.
Owner:BLAZE NETWORK PRODS
Micro-structured optical fiber surface plasmon resonance sensor
InactiveCN102590143AImprove performanceLow loss transmissionOptical fibre with multilayer core/claddingPhase-affecting property measurementsImage resolutionCoupling
The invention discloses a micro-structured optical fiber surface plasmon resonance sensor, wherein a cladding layer is an annular cladding layer consisting of three concentric layers; the inner annular cladding layer consists of fan-shaped annular supporting arms (3) and inner layer air holes (2); the outer annular cladding layer consists of rectangular supporting arms (6) and outer layer liquid holes (5); the middle annular cladding layer is connected with the fan-shaped annular supporting arms (3) and the rectangular supporting arms (6); the number of both the fan-shaped annular supporting arms (3) and the rectangular supporting arms (6) is N; and the sensor has 360 / No rotational symmetry. The fan-shaped annular supporting arms are used for adjusting coupling depth; and the spatial distribution of a fiber core fundamental mode is enabled to be gaussian. The operation wavelength of the sensor is at C+L wavelength; the spectral sensitivity within an analytic liquid refractive index range of 1.320-1.335 can reach over 10,000 nm RIU<1>, and the corresponding sensing resolution reaches the magnitude of 10<5> RIU; and the micro-structured optical fiber surface plasmon resonance sensor is suitable for high-accuracy real-time detection of liquid refractive index.
Owner:JIANGSU UNIV
Ultra-wideband supercontinuum source based on two-waveband fiber optic laser
ActiveCN104201545ALow loss transmissionLaser arrangementsActive medium shape and constructionUltra-widebandLaser light
The invention belongs to the technical field of fiber optic laser light and provides an ultra-wideband supercontinuum source based on a two-waveband fiber optic laser. The ultra-wideband supercontinuum source comprises a first fiber optic laser, a second fiber optic laser, a wavelength division multiplexer, and a cascaded two-stage supercontinuum evolution assembly. The ultra-wideband supercontinuum source based on the two-waveband fiber optic laser is characterized in that two fiber optic lasers of different wavebands are adopted as seed sources to form the two-waveband fiber optic laser for simultaneously outputting two-waveband laser light, and the two-waveband laser light is used for pumping the cascaded evolution assembly. Specifically, when the two-waveband laser light passes through the first-stage evolution assembly, the laser light of one waveband is evolved into a visible light- near infrared supercontinuum, while the laser light of the other waveband is evolved into an ultrashort pulse, the visible light- near-infrared supercontinuum and the ultrashort pulse are coupled together to go into the second-stage evolution assembly, next, the ultrashort pulse is evolved into a near infrared-intermediate infrared supercontinuum in the second-stage evolution assembly, while the visible light- near-infrared supercontinuum generated in the previous stage is transmitted in the second-stage evolution assembly at low loss, and finally, an ultra-wideband supercontinuum covering three wavebands of visible light, near infrared and intermediate infrared is output from a cascaded optical fiber.
Owner:MIL MEDICAL TECH (SHENZHEN) CO LTD
Electrically controlled micronano optical fiber optical switch based on graphene thin film
InactiveCN102495479ALower turn-on voltageBroad prospects for integrationNon-linear opticsRefractive indexGraphene
The invention discloses an electrically controlled micronano optical fiber optical switch based on a graphene thin film. The electrically controlled micronano optical fiber optical switch comprises a tapering light output micronano optical fiber, a tapering light input micronano optical fiber and a circuit control module based on the graphene thin film, wherein in the circuit control module based on the graphene thin film, a silicon base coated with the graphene thin film is used as a center; a metal electrode is arranged on the rim of the silicon base; the tapering light output micronano optical fiber and the tapering light input micronano optical fiber are oppositely arranged on the graphene silicon base; the ends of the two micronano optical fibers are adsorbed together by a van der Waals force, and serve as a coupling end of a light path; and ultraviolet photoresist with low refractive index is coated on the micronano optical fibers. On the basis of the property of graphene, the novel optical fiber optical switch has the characteristics of small size, short response time, low driving voltage and improved reliability by combining the evanescent wave characteristics of the micronano optical fibers.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
High-frequency transmission based LTCC and PCB perpendicular interconnecting structure and method
ActiveCN106028641ALow loss transmissionSmall footprintPrinted circuit assemblingPrinted circuit aspectsSystem integrationHigh density
The invention relates to transmission of broadband high-frequency signals, belongs to the field of electrical interconnection, and particularly to a high-frequency transmission based LTCC and PCB perpendicular interconnecting structure and method. The invention provides the perpendicular interconnecting structure and method for overcoming the problems existing in the prior art. The designed interconnecting structure is based on a ball grid array (BGA) welding structure, so that the miniaturization and high-density system integration can be promoted. The perpendicular interconnecting structure comprises an LTCC assembly, a PCB assembly and an interconnecting structure; ball-mounting welding on the bonding pad is carried out on the quasi coaxial structure of the second LTCC assembly; then the ball-mounted LTCC assembly is used as a device; next, the device is assembled on the PCB assembly by adopting a standard SMT process, so that the interconnection between the quasi coaxial structure of the second LTCC assembly and the coaxial structure in the first PCB assembly is realized through the solder ball; and the perpendicular interconnection between the LTCC assembly and the PCB assembly is realized.
Owner:SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
Optical energy collection and perfect reflection optical energy transmission system
InactiveCN101424785AReduce lossesLow loss transmissionSolar heating energySolar heat collector controllersLight energyFocal position
A light energy collection and full reflecting light energy transmission system belongs to a solar energy collection and transmission device and comprises a concave collecting mirror, wherein the focal position of the concave collecting mirror is provided with a light energy density multiplier through a positioning bracket; the cylindrical light output end of the light energy density multiplier is connected with a full reflecting light transmission rod which is connected with a soft light transmission pipe; the light transmission pipe transmits light energy to using points; the light energy density multiplier is composed of a light energy density multiplication convex lens, a lens positioning body, a coat, a light transmission direction regulation convex lens or a light transmission regulation concave lens and a light transmission output end. The light energy collection and full reflecting light energy transmission system utilizes the full reflecting broadcasting principle of light in media to realize solar energy density multiplication and low-loss transmission of energy and expands the application field of the technology.
Owner:罗德礼
Lens array type light energy collecting and transmitting system
InactiveCN102608740AImprove absorption efficiencyLow loss transmissionCoupling light guidesCondensersTransport systemLight energy
A lens array type light energy collecting and transmitting system mainly comprises a light energy collecting unit and a light energy transmitting unit. The light energy collecting unit consists of a lens array, and light energy is collected by the aid of the lens array and then is gathered to the light energy transmitting unit. The light energy transmitting unit consists of three portions, the first portion includes optical fiber couplers corresponding to small lenses of the lens array in a one-to-one manner, light is collected to the optical fiber couplers by the aid of the small lenses, the second portion includes sub optical fibers corresponding to the optical fiber couplers in a one-to-one manner, the light energy is transmitted to the sub optical fibers by the aid of the optical fiber couplers, the third portion includes a main optical fiber gathering the previous sub optical fibers, and the sub optical fibers transmit the light energy gathered and transmitted by the lens array to the optical fiber couplers to the main optical fiber, so that the light energy is collected and transmitted. The system is low in cost, the light energy can be collected in a large area, and low-loss transmission of the light energy is realized.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna
The invention discloses a medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna, which comprises a simulated light module, a medium-frequency transceiver module, radio transceiver modules and antenna units, wherein the simulated light module connected with a near-end machine is connected with the radio transceiver modules through the medium-frequency transceiver module; and each radio transceiver module is connected with one antenna unit. Different from the conventional array antenna, the medium-frequency simulated RoF type phase control active integrated antenna has the characteristics that each antenna unit in the active integrated antenna array is directly connected with one complete radio transceiver module, and a signal of each unit is subjected to power distribution / combination on the medium frequency, passes through the medium-frequency transceiver module and is connected with the light module and finally converted into a light signal through the light module for long-distance low-loss transmission; and the phase of the radio transceiver module behind each antenna unit is controllable, so that the wave beam of the whole array can be scanned in the perpendicular direction.
Owner:SOUTHEAST UNIV
Implantable side-pumping coupling method
The invention discloses an implantable side-pumping coupling method. The implantable side-pumping coupling method is characterized by including a double-cladding active optical fiber and at least one multimode fiber, wherein the double-cladding active optical fiber is used for producing laser or amplifying the laser, and the multimode fiber is used for being connected with a pumping source. Pumping light is coupled into the double-cladding active optical fiber through the multimode fiber in the implantable side-pumping coupling method. The method includes the following steps: (1) carrying out pretreatment on the double-cladding active optical fiber and the multimode fiber respectively, (2) heating an area to be coupled in the double-cladding active optical fiber and implanting the multimode fiber into the double-cladding active optical fiber, and (3) encapsulating the implantation point after the area to be coupled cools down. Through the implantable side-pumping coupling method, pumping coupling efficiency is high, multipoint distributed pumping can be conveniently adopted, manufacturing process is simple, cost is low, and the method is particularly applicable to high-power fiber lasers high-power fiber amplifiers.
Owner:CHINA ELECTRONICS TECH GRP NO 46 RES INST
Plug-in connector for medical tubes
ActiveUS20100056933A1Guaranteed reliable connectionManufactured and handledFluid pressure sealed jointsEvaluation of blood vesselsEngineeringMechanical engineering
Owner:DRAGERWERK AG
Side-pumping middle-infrared band fiber pumping signal beam combiner
InactiveCN106299983ALow loss transmissionImprove coupling efficiencyActive medium shape and constructionFiberMiddle infrared
The invention provides a side-pumping middle-infrared band fiber pumping signal beam combiner. The side-pumping middle-infrared band fiber pumping signal beam combiner comprises a signal fiber and a plurality of pumping fibers arranged on the signal fiber. after a coating layer of one end of each pumping fiber is stripped, fused biconical taper is performed, and the end and a part, which is of the signal fiber, with the coating layer being stripped are fixedly connected via melting and solidification. Middle-infrared signal laser and pumping laser respectively enter the signal fiber and the pumping fibers, and through coupling, are output from the other end of the signal fiber. The core of the signal fiber is made of germanium dioxide, and an inner cladding material is a mixed material of germanium dioxide and quartz or a pure quartz material, and therefore, low loss transmission of middle-infrared signal light in the band of 2.7-3.1[mu]m in the fiber core is achieved, and low loss transmission of pumping light in an inner cladding layer is achieved. Coupling efficiency can be controlled not less than 98%, passing rate of the signal light is not less than 99%, pumping laser of more than one hundred watts can be coupled to output fibers, and a high power middle-infrared fiber amplifier is achieved.
Owner:NAT UNIV OF DEFENSE TECH
Three-channel microwave rotary joint
The invention discloses a three-channel microwave rotary joint which comprises a single-waveguide rotor, a double-waveguide rotor, a double-waveguide stator, a single-waveguide stator, a first bearing, a second bearing, a first connection arm, a second connection arm, a first inner conductor, a second inner conductor and a third inner conductor. According to the three-channel microwave rotary joint, the axial distance is short, the signal transmission loss is reduced, the problem of multi-channel Ka frequency band signal transmission is solved, the transmit-receive insulation degree is good, double-bearing design is adopted, coaxiality is guaranteed through precise machining and assembling, electrical performance fluctuation generated in the rotating process is greatly lowered, and the reliability of spacecraft moving components is improved.
Owner:BEIJING RES INST OF TELEMETRY +1
Air-core polarization maintaining photonic crystal optical fiber
ActiveCN106842418AAchieving polarization maintaining performanceLow loss transmissionOptical fibre with polarisationMulticore optical fibreRefractive indexLinear coefficient
The invention relates to an air-core polarization maintaining photonic crystal optical fiber. Along a circle of the inner wall of a glass tube, a plurality of micro capillaries are arranged to form a pore inner covering layer area, the peripheral part of the pore inner covering layer area and the contact part of the inner wall of the glass tube are fixed on the inner wall of the glass tube in a welding mode, the middle part of the pore inner covering layer area is a low refractive index fiber core I, namely a fiber core area, and the two sides of the fiber core area are low refractive index fiber cores II, namely seven-cell pores; the two sides in the fiber core area are gap areas which are enveloped by symmetrical fiber cores; or the upper side and the lower side in the fiber core area are symmetrically provided with convex areas which are enveloped by two fiber cores; or the two sides in the fiber core area are the gap areas which are enveloped by the fiber cores, and the upper side and the lower side in the fiber core area are symmetrically provided with the convex areas which are enveloped by the two fiber cores. The polarization maintaining performance, low-loss transmission and single-model advantages can be achieved, and the air-core polarization maintaining photonic crystal optical fiber has the advantages of being high in temperature stability, low in non-linear coefficient, low in magnetic field sensitivity, good in irradiation resistance and the like.
Owner:CHINA ELECTRONICS TECH GRP NO 46 RES INST
Collimating optical system, based on elliptical mirror focusing, enabling high-resolution rapid scan imaging
ActiveCN104898171AFast scan imagingIncrease rotation speedDetection using electromagnetic wavesPublic placeImage resolution
The invention discloses a collimating optical system, based on elliptical mirror focusing, enabling high-resolution rapid scan imaging. The system comprises a flat mirror, a condenser and a reception antenna. The condenser is an elliptical mirror. A wedge mirror is arranged between the elliptical mirror and the reception antenna. The wedge mirror receives reflected light information of the elliptical mirror, and reflects the reflected light information to the reception antenna. The flat mirror is a pitching flat mirror, the mirror surface of which faces a to-be-measured object to pitch and swing. The wedge mirror is a rotary wedge mirror, the wedge surface of which faces the elliptical mirror and the reception antenna to rotate. The system helps to overcome the disadvantages that terahertz waveband close range passive safety check imaging is low in resolution and long in time. The elliptical reflector, the rotary wedge mirror and a detector array are combined together to achieve high resolution and high-efficiency quick safety check imaging. The collimating optical system is simple in control and high in precision, and can be widely applied to the close range safety check imaging field in public places such as airports, subways and ferry wharfs.
Owner:BEIJING AEROSPACE YILIAN TECH DEV
Millimeter wave multi-channel radio frequency receiving front end for Ka frequency band feed source
ActiveCN104363024ALow loss transmissionThe connection is tight and firmWave based measurement systemsTransmissionLocal oscillatorRadio frequency signal
The invention discloses a millimeter wave multi-channel radio frequency receiving front end for a Ka frequency band feed source. The front end comprises a Ka frequency band receiving component, a local oscillator 16 branching unit, a waveguide network, an N type local oscillator input socket, a high-low frequency mixing intensive connector, a support beam, a connector, a shell, a receiving component support, a local oscillator branching unit support, a base, an adjusting cushion block and a base cover plate. The waveguide network feeds received radio frequency signals into the Ka frequency band receiving component, the Ka frequency band receiving component outputs down-conversion signals through the high-low frequency mixing intensive connector, the N type local oscillator input socket is connected with an external local oscillator source signal, the output end of the local oscillator 16 branching unit is connected with the local oscillator input end of the Ka frequency band receiving component, the adjusting cushion block is fixed on the waveguide network and used for adjusting the heights of the Ka frequency band receiving component and the waveguide network, the local oscillator 16 branching unit is fixed on the connector through the local oscillator branching unit support, the connector is mounted on the support beam, and the shell and the base cover plate are mounted on the base.
Owner:BEIJING RES INST OF TELEMETRY +1
Mode filtering fiber
ActiveCN104503018AThe filtering method is simpleLow loss transmissionCladded optical fibreOptical waveguide light guideFew mode fiberDielectric cylinder
Owner:JIANGSU UNIV
Hollow core energy transfer mid-infrared fiber and preparation method thereof
PendingCN110333570ABand filtering is goodHigh damage thresholdGlass making apparatusOptical fibre with multilayer core/claddingMid infraredPeriodic Interval
The invention discloses a hollow core energy transfer mid-infrared fiber and a preparation method thereof. The fiber is applied to a quantum cascade laser, has a hollow tubular shape and comprises a fiber cladding, an air core therein and a fiber polymer protective layer disposed on the outer surface of the fiber cladding, wherein the fiber cladding comprises alternating spaced polymer layers andchalcogenide glass layers containing tellurium elements. In the hollow core energy transfer fiber cladding provided by the invention, the chalcogenide glass layers and the polymer layers are periodically spaced to form a photonic band gap structure. Since the cladding contains tellurium elements and the two materials have a high refractive index difference, a wide transmission range (covering 3-20[mu]m) and low loss therein are ensured. In addition, the core contains an air medium to increase the damage threshold of the fiber. Therefore, the fiber provided by the invention can be applied to the quantum cascade laser and rationally designs the above periodic structure to realize the adjustability of the transmission band. In addition, the polymer makes the fiber light, flexible and portable, thereby enabling the portable transmission of laser from the quantum cascade laser.
Owner:HUAZHONG UNIV OF SCI & TECH
Power transmission line vibration monitoring device
PendingCN109668619AAvoid electromagnetic interferenceImprove reliabilitySubsonic/sonic/ultrasonic wave measurementUsing wave/particle radiation meansEngineeringPower transmission
The invention provides a power transmission line vibration monitoring device, which comprises an outer sleeve (2), an inner sleeve (3), a heavy object (5) and a first optical fiber grating sensing unit (1), wherein the outer sleeve (2) and the inner sleeve (3) are glidingly connected; the inner sleeve (3) is sheathed on a conducting wire to be tested; the heavy object (5) is connected with the lower part of the outer sleeve (2); the first optical fiber grating sensing unit (1) is fixedly arranged at the outer wall of the inner sleeve (3). The technical scheme provided by the invention has theadvantages that an optical fiber grating sensor is used as a main sensing unit; the vibration of the conducting wire in the vertical direction, the transverse direction and the torsion direction is monitored; the reliability is high; the function is strong; the comprehensive accurate obtaining of power transmission line vibration parameters is realized; the line security is guaranteed; important data support is provided for design and modification.
Owner:CHINA ELECTRIC POWER RES INST +1
Low-profile absorption/transmission integrated anti-interference device with ultra-wide absorption band
InactiveCN113410650ASolve the problem that the signal cannot be transmittedImprove electromagnetic anti-interference abilitySubstantially flat resonant elementsSlot antennasUltra-widebandInterference resistance
The invention is applied to the field of invisible radomes, and particularly relates to a low-profile absorption / transmission integrated anti-interference device with an ultra-wide absorption band. The device comprises an absorption type metasurface, a band-pass type metasurface and two layers of dielectric substrates, wherein the absorption type metasurface is printed on the upper surface of the upper-layer dielectric substrate; the band-pass metasurface is printed on the upper surface of the lower-layer dielectric substrate; an air layer is arranged between the upper-layer dielectric substrate and the band-pass metasurface. A unit structure of the absorption type metasurface is composed of four 90-degree arc-shaped metal patches, and a patch resistor is loaded in a gap between every two adjacent arc-shaped metal patches. Each unit of the band-pass metasurface is formed by etching a cross-shaped gap in the center of a square metal patch. According to the invention, ultra-wideband absorption can be realized at a lower frequency band, low-loss transmission can be realized at a higher frequency band, the problem that a traditional metamaterial wave absorber cannot transmit signals is solved, and the anti-interference device has great significance in development of the fields of electromagnetic protection and invisible radomes.
Owner:SHANXI UNIV
High-frequency low-loss adhesive-free flexible copper-clad plate and manufacturing method thereof
ActiveCN110733211ALow dielectric constantLow loss transmissionLamination ancillary operationsSynthetic resin layered productsAdhesiveDielectric loss
The invention provides a high-frequency low-loss adhesive-free flexible copper-clad plate. The high-frequency low-loss adhesive-free flexible copper-clad plate comprises two layers of copper foils arranged on the top layer and the bottom layer, fluororesin films formed on the surfaces of the inner sides of the two layers of copper foils respectively, and a PI film arranged between the upper fluororesin film and the lower fluororesin film. The fluororesin film is a film layer formed by coating a copper foil with a fluororesin coating liquid, and the thickness of the fluororesin film is 3-50 [mu] m; wherein the melting temperature of the fluororesin film is greater than or equal to 290 DEG C, the peel strength of the fluororesin film to the copper foil is greater than 1.0 kg / cm, and the peelstrength of the fluororesin film to the polyimide film is greater than 0.6 kg / cm; the thickness ratio of the fluororesin film to the PI film is 1: 4-2: 1; the dielectric constant of the copper-clad plate at the frequency of 20-40GHz is lower than 3.0, the dielectric loss is lower than 0.2%, the bending resistance is higher than 300,000 times, and the linear expansion coefficient is lower than 30ppm. According to the invention, the loss of high-frequency signals in the transmission process can be reduced.
Owner:SHENZHEN HONGHAI ELECTRON MATERIAL TECH CO LTD
Laser optical fiber adjustment device based on optical fiber coupler and optical fiber collimator
InactiveCN107479146AAchieve fine tuningIncrease flexibilityCoupling light guidesMountingsLight beamOptical fiber coupler
The invention discloses a laser optical fiber adjustment device based on an optical fiber coupler and an optical fiber collimator and belongs to the precision optical instrument technical field. The laser optical fiber adjustment device comprises an optical fiber coupling system, a transmission system and an optical fiber alignment system; the optical fiber coupling system comprises a laser (1), a optical fiber coupling device (2) and a base (3); the transmission system comprises an optical fiber jumper (4); and the optical fiber alignment system comprises a fiber collimating device (5) and a bottom plate (6). According to the laser optical fiber adjustment device of the present invention, with a laser beam emitted from the laser used as references, the optical fiber coupler is adopted to complete the spatial adjustment of the laser fiber of the laser, and therefore, the low-loss transmission of the laser beam can be realized; and the transmitted laser beam is collimated and sent out by the optical fiber collimator, so that the collimated laser beam can be adopted as the working light source of a precision optical instrument.
Owner:BEIJING UNIV OF TECH
Low-loss bend insensitive single mode fiber with pure silicon fiber core
InactiveCN103901533AReduce lossLow refractive indexOptical fibre with multilayer core/claddingSilicon dioxideSilicon
The invention discloses a low-loss bend insensitive single mode fiber with a pure silicon fiber core. The low-loss bend insensitive single mode fiber comprises the pure silicon dioxide fiber core, inner cladding doped with the low refractive index, air vent hole structures and outer pure silicon cladding. The fiber core is coated with the inner cladding. The air vent hole structures are symmetrically distributed outside the inner cladding in a regular hexagon. The outer cladding is arranged outside the air vent hole structures so that the fiber core, the inner cladding and the air vent hole structures can be coated. The pure silicon dioxide fiber core is adopted so that loss of the fiber core can be effectively reduced. The structure of the inner cladding with the low refractive index is adopted, so that the refractive index of the fiber core is higher than that of the inner cladding, low-loss transmission of light in the fiber core is limited, and the mode field area and appearance of a high-order mode are controlled. The structure that air vent holes are compounded with the outer cladding is adopted, so that the influence of bending on the fiber core is reduced, bending loss is reduced, and the excellent bend insensitive performance is obtained. Air vent holes are distributed in the regular hexagon so that prefabricated rods can be well stacked and controlled in the rod forming process and the accuracy of the structure is improved.
Owner:SHANGHAI JIAO TONG UNIV
RoF (radio over fiber) phased active integral antenna applicable to FDD (frequency division duplexing) system
The invention discloses a RoF (radio over fiber) phased active integral antenna array applicable to an FDD (frequency division duplexing) system. The RoF antenna array comprises an optical module, an intermediate-frequency transmitting and receiving module, a plurality of radiofrequency transmitting and receiving modules and antenna units; and the optical module connected with a near-end machine is connected with the radiofrequency transmitting and receiving modules by the intermediate-frequency transmitting and receiving module, and each radiofrequency transmitting and receiving module is connected with the corresponding antenna unit. Compared with the traditional array antenna, the RoF phased active integral antenna array has the advantages that each antenna unit in the active integral antenna array is directly connected with the corresponding complete radiofrequency transmitting and receiving module, signals of each unit are subjected to power division / combination in intermediate frequencies, are connected with the optical module after being processed by the intermediate-frequency transmitting and receiving module, and finally can be converted into optical signals by the optical module, and the optical signals can be transmitted at low loss over long distances; and the phase of each radiofrequency transmitting and receiving module behind the corresponding antenna unit is controllable, and accordingly beams of the integral array can be scanned in the vertical direction.
Owner:SOUTHEAST UNIV
One-into-six equipower distributor
InactiveCN103700918ASmall transmission lossSolve welding difficultiesCoupling devicesHigh isolationCopper
The invention provides a one-into-six equipower distributor. The power distributor comprises a box body, a PCB (Printed Circuit Board), a box cover and an SMA connector joint; a metal copper-clad bottom layer, a lower medium layer, a middle transmission line layer, an upper medium layer and a metal copper-clad top layer are sequentially arranged on the PCB from bottom to top, an input end is arranged on one side of the middle transmission line layer, the input end is connected with a one-into-three equipower distribution circuit after being led out, the tail ends of the one-into-three equipower distribution circuit are connected with a one-into-two equipower distribution circuit, the tail ends of the one-into-two equipower distribution circuit are output ends and extend to the other side of the middle transmission line; the PCB and the box cover are fixedly arranged in the cavity of the box body, the metal copper-clad bottom layer of the PCB and the bottom of the cavity of the box body are fit, the box cover and the metal copper-clad bottom layer of the PCB are fit, the input end and the output end of the PCB respectively correspond to the position of the SMA connector joint on the box body, and an SMA connector is arranged on the SMA connector joint. The one-into-six equipower distributor has the characteristics of being capable of realizing wideband, low loss and high isolating degree, low in cost and the like.
Owner:北京理工雷科电子信息技术有限公司
Asymmetric directional coupler, adjustable mode generator and optical circulator
The invention provides an asymmetric directional coupler which comprises a substrate, top silicon is arranged on the substrate and comprises a first port, a coupling area, a first output waveguide and a second output waveguide, one end of the coupling area is connected with the first port, and the other end of the coupling area is connected with the first output waveguide and the second output waveguide. The coupling area is covered with a phase change material layer, the coupling area is divided into N * M rectangular units, a non-periodic first punching array meeting a preset first output target is formed by adjusting the state of the rectangular units, and the first output target refers to the sum of the transmittance of the first output waveguide and the transmittance of the second output waveguide; the asymmetric directional coupler provided by the invention is small in size, easy to process, stable in performance and capable of realizing regulation and control of a light propagation path.
Owner:NAT UNIV OF DEFENSE TECH
Terahertz waveguide
ActiveCN110289471AAvoid interferenceReduced tethering lossNanoopticsWaveguidesMicro structureWavelength
The invention provides a terahertz waveguide comprising: an input end including an input-end waveguide and an input-end micro-structure waveguide which are successively connected to each other; a transmission end including a sub-wavelength waveguide, an air layer surrounding the sub-wavelength waveguide, and an outer wrapping layer surrounding the air layer, wherein one end of the sub-wavelength waveguide is connected to the other end of the fiber core of the input-end micro-structure waveguide, and one end of the outer wrapping layer is connected to the wrapping layer of the input-end micro-structure waveguide; and an output end including an output-end micro-structure waveguide and an output-end waveguide, wherein the other end of the sub-wavelength waveguide is connected to one end of the fiber core of the output-end micro-structure waveguide, the other end of the outer wrapping layer is connected to the wrapping layer of the output-end micro-structure waveguide, and the other end of the fiber core of the output-end micro-structure waveguide is connected to the other end of the output-end waveguide. The terahertz waveguide solves the problem that a conventional sub-wavelength waveguide needs mechanical support in the whole transmission direction, ensures that the two-end structure has the least influence on the transmission of the internal terahertz wave in the main transmission section, and realizes the isolation of the transmission waveguide and the environment.
Owner:JIANGSU UNIV
Radio frequency module and communication device
ActiveUS20210351903A1Low loss transmissionTransmission path divisionDuplex signal operationRF moduleCommunication device
A radio frequency module includes: a first antenna connection terminal; a second antenna connection terminal different from the first antenna connection terminal; a first filter having a passband of a first frequency range including a first communication band allocated as a TDD communication band; a second filter having a passband of a second frequency range including a second communication band allocated as a TDD communication band; and a third filter having a passband of a third frequency range including a third communication band allocated as a TDD communication band. The third frequency range is located between the first frequency range and the second frequency range. The first and second filters are both connected to one of the first antenna connection terminal and the second antenna connection terminal. The third filter is connected to the other of the first antenna connection terminal and the second antenna connection terminal.
Owner:MURATA MFG CO LTD
Silicon-based on-chip Fourier transform spectrometer with high resolution and large measurement range
ActiveCN112013959AIncreased waveguide length differenceSmall waveguide length differenceRadiation pyrometryInterferometric spectrometryBeam splitterLight flux
The invention discloses a silicon-based on-chip Fourier transform spectrometer with high resolution and a large measurement range. A to-be-measured light source is connected with an input waveguide; the output end of the input waveguide is connected with the input end of a 3dB power beam splitter; two ends of the 3dB beam splitter are respectively connected with one ends of multi-stage optical path selectors, and the two multi-stage optical path selectors are used as upper and lower interference arms; the output ends of the two multi-stage optical path selectors are connected with low-loss Euler spiral lines which have a specific length and is covered with metal electrodes; the other ends of the two low-loss spiral line waveguides are simultaneously input to the input end of the optical power beam combiner; and the output end of the optical power beam combiner is connected with the input end of the optical power detector to monitor the intensity of output optical signals. According tothe invention, the low-loss waveguide and the quasi-continuous thermal regulation waveguide are combined with a traditional on-chip Fourier spectrometer for the first time, and the silicon-based on-chip Fourier transform spectrometer can be used for biosensing, spectral measurement and other systems, and has the advantages of high resolution, large measurement range, high luminous flux, compact structure and the like.
Owner:ZHEJIANG UNIV
Millimeter wave/light wave common caliber transmission device
InactiveCN107560499ALow loss transmissionImprove reflectivityMirrorsAiming meansVIT signalsTransmittance
The invention discloses a millimeter wave / light wave common caliber transmission device. The device comprises a millimeter wave signal source, a millimeter wave signal detecting device, a light wave signal source and a light wave signal detecting device. Light wave signals emitted by the light wave signal source are transmitted to a pattern place for transmission according to an optimal reflectingrule in a direction of an optimal emitting angle equal to an incident angle, and are detected by the light wave signal detecting device; millimeter wave signals sent by the millimeter wave signal source are transmitted to one side of a nonmetal surface of a substrate for transmittance; the resonant frequency of the pattern is selected; and after selection of the resonant frequency of the pattern,the millimeter wave signals are transmitted in a traditional transmitting direction in space, and are detected by the millimeter wave signal detecting device. The thickness of a medium substrate andthe thickness and the material of a plated metal film layer are measured through the size change of the pattern; the selective low-loss transmission of radio-frequency signals with specific frequencyis realized; and high-reflectivity transmission of infrared signals is realized.
Owner:BEIJING ZHENXING METROLOGY & TEST INST
High heat dissipation silicon-based package substrate and manufacturing method thereof and high heat dissipation package structure
PendingCN109686707AHighly integratedReduce volumeSemiconductor/solid-state device detailsSolid-state devicesHeat conductingEngineering
The invention provides a high heat dissipation silicon-based package substrate, which includes a silicon base. A plurality of vertical through-holes are formed in the silicon base longitudinally, thevertical through-holes penetrate through the upper surface and the lower surface of the silicon base, electric and heat conducting columns are arranged in the vertical through-holes, both ends of theelectric and heat conducting columns are exposed to the upper surface and the lower surface of the silicon base, electrical isolation layers are arranged on the outer side walls of the electric and heat conducting columns, and the diameter range of the vertical through-holes is 50-200 [mu]m. The high heat dissipation silicon-based package substrate has the advantages of high heat dissipation module integration level, small volume, low cost, and being facilitated to application of a package structure. Furthermore, the invention further provides a manufacturing method of the high heat dissipation silicon-based package substrate and the package structure based on the manufacturing method.
Owner:苏州锐杰微科技集团有限公司
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