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729results about How to "Small insertion loss" patented technology
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Phased-array antenna based on dynamic-regulating artificial electromagnetic structural materials
ActiveCN103474775ARealize two-dimensional dynamic scanningSimple structureWaveguide hornsEngineeringDielectric slab
The invention provides a phased-array antenna based on dynamic-regulating artificial electromagnetic structural materials. The phased-array antenna comprises a horn feed source and multiple layers of the dynamic-regulating artificial electromagnetic structural materials covering the upper portion of the horn feed source. Each layer of the materials is formed in the modes that metal patches with annular gaps distributed periodically are printed on the front of a dielectric slab, variable capacitance diodes are embedded in vertical centers of the annular gaps, gap lines used for isolating direct currents are etched between the annular gaps in different columns, and metal leads are printed on the back of the dielectric slab and via holes are metallized so that direct-current voltage can be provided for the metal patches in the annular gaps in different rows. Capacitance of the variable capacitance diodes between different rows or different columns is adjusted through controlling of a direct-current voltage source, so that radiation phases of regions in adjacent rows or adjacent columns gradually increase or decrease, the phase different value is dynamically adjusted, and dynamic scanning of antenna beams can be achieved. The phased-array antenna has the advantages of being simple in structure, convenient to power up, low in insertion loss, low in cost and the like and can achieve two-dimensional dynamic scanning of an E face and an H face.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Signal transceiving device and terminal equipment
ActiveCN109802699ASmall insertion lossImprove performanceSpatial transmit diversityRadio transmissionTerminal equipmentEngineering
The invention provides a signal receiving and transmitting device and terminal equipment. The signal receiving and transmitting device comprises a first communication module and a second communicationmodule, a first switch is respectively connected with the first end of the first communication module and the first end of the second communication module; a second switch is connected with the second end of the first communication module; a first antenna structure is connected with the second switch; a third switch is connected with the second end of the second communication module; a second antenna structure is connected with the third switch; Wherein the first communication module corresponds to a first transmitting link and two receiving links, and the second communication module corresponds to a second transmitting link and two receiving links; At least one of the first transmitting link and the second transmitting link is conducted during signal transmitting, and two receiving linkscorresponding to the first communication module and the second communication module are conducted during signal receiving. According to the invention, the insertion loss of a receiving link can be reduced, the performance of a transmitting link is improved, the routing length is reduced, and the compatibility of 1T4R and 2T4R modes is realized.
Owner:VIVO MOBILE COMM CO LTD
Full-duplex active phased filter antenna array surface
ActiveCN109616759ALow costReduce power consumptionAntenna arraysRadiating elements structural formsRadio frequencyActive phase
The invention discloses a full-duplex active phased filter antenna array surface, and aims at providing an antenna array surface with high-isolation array transmitting and receiving and good filter characteristic. A transmitting antenna array surface of a transmitting array antenna and a receiving antenna array surface of a receiving array antenna consist of a plurality of arrayed radiation units;a multi-layer printed board integrally integrating a radiation circuit, a feed switching circuit and a filter circuit achieves connection between different circuits by vertical interconnection structures of metallized via holes; a metal upper cavity body of a transmitting-receiving component serves as a metal ground; a metal upper cavity body base of a metal floor is consubstantially connected byradio-frequency fuzz button connectors; and then a radiation unit and transmitting-receiving component integrated box-type submatrix module filter antenna unit is formed. With the adoption of the full-duplex active phased filter antenna array surface, high-isolation array transmitting and receiving can be achieved; insertion losses of array transmitting and receiving can be reduced; and high-precision amplitude and phase control can be achieved.
Owner:10TH RES INST OF CETC
High/intermediate-frequency front-end circuit of digital short-wave receiver
The invention relates to a high / intermediate-frequency front-end circuit of a digital short-wave receiver, which mainly comprises a PIN diode electric control attenuator, digital control electric tuning preselected tracking filter groups, a gain control low-noise amplifier, a direct digital frequency synthesizer, a plurality of frequency mixers, an intermediate-frequency amplifier, an amplitude detection and grain control circuit and a preselected controller, wherein a weak signal sensed by an antenna is subjected to tracking frequency selection by the first digital control electric tuning preselected tracking filter group after passing through the PIN diode electric control attenuator and then is subjected to frequency selection by the second digital control electric tuning preselected tracking filter group after being amplified by the gain control low-noise amplifier, the signal after being subjected to frequency selection is subjected to frequency mixing three times with the plurality of frequency mixers by three local oscillators formed by the frequency synthesizer and is transmitted to a demodulator for demodulation after being subjected to multistep intermediate-frequency amplification and gain control processing. The high / intermediate-frequency front-end circuit of the digital short-wave receiver can meet the requirement of high sensitivity, strong anti-interference performance and wide dynamic range for the short-wave receiver, is suitable for a frequency-hopping receiving machine with rapid frequency change and has the effects of low insertion loss, low in-band ripple and high selectivity.
Owner:WUHAN UNIV OF TECH
Low-pass and high-absorption electromagnetic functional layer
InactiveCN105304978AAdjusting the absorbing performanceLow costMagnetic/electric field screeningWaveguide type devicesHigh resistanceHigh absorption
The invention discloses a low-pass and high-absorption electromagnetic functional layer, which comprises a low-pass and high-resistance frequency selection surface and a wave absorption unit array, wherein the low-pass and high-resistance frequency selection surface comprises metal structure unit arrays which are etched on two surfaces of a dielectric substrate and are different in structure size; the periods p of the unit arrays are 10.0mm to 20.0mm; metal structure units have rotation symmetry; the frequency selection characteristics of the metal structure units are irrelevant to the polarized direction of an incident wave; the metal structure units on two surfaces are different in size; the wave absorption unit array is a periodic array which comprises square or round sheets which are fabricated by magnetic loss radar wave-absorbing materials or resistance type wave-absorbing materials; the wave absorption unit array has broadband wave absorption performance on a high-frequency band; the sizes of wave absorption units are smaller than those of the metal structure units; and each wave absorption unit is adhered to one side of each metal structure unit with a relatively small size of the low-pass and high-resistance frequency selection surface. The obtained material is small in insertion loss, small in thickness, flexible in design and low in cost.
Owner:AIR FORCE UNIV PLA
BOSA (Bi-Di Optical Subassembly) optical structure used for high-speed receiving and transmitting system
ActiveCN104076450AReduce technical difficulty and costCompensation for Optical Path MismatchCoupling light guidesElectromagnetic transceiversWavelength-division multiplexingCoupling efficiency
A BOSA (Bi-Di Optical Subassembly) optical structure used for a high-speed receiving and transmitting system comprises a shell; the shell is internally provided with a transmitting-end TOSA optical structure and a receiving-end ROSA optical structure; the transmitting-end TOSA optical structure comprises a wavelength division multiplexing device (MUX), an isolator and a receiving collimator; and the receiving-end ROSA optical structure comprises a wavelength division demultiplexing device (DEMUX) and a second collimator. The BOSA (Bi-Di Optical Subassembly) optical structure used for the high-speed receiving and transmitting system is characterized in that the shell is internally provided with a baffle; the baffle separates the transmitting-end TOSA optical structure and the receiving-end ROSA optical structure; the transmitting-end TOSA optical structure also comprises a first rhombic prism bending a beam emergent from the isolator to the receiving collimator; and the receiving-end ROSA optical structure also comprises a second rhombic prism bending a beam emergent from the second collimator to the wavelength division demultiplexing device. by adopting the micro optical structure design, beam insert loss can be greatly reduced, the coupling efficiency is improved, power consumption is reduced, and long-distance transmission of optical signals is facilitated.
Owner:SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
Wireless surface acoustic wave temperature measurement system reader-writer
InactiveCN103279777AGood effectGuaranteed stabilityCo-operative working arrangementsThermometers using physical/chemical changesDigital signal processingBandpass filtering
The invention discloses a wireless surface acoustic wave temperature measurement system reader-writer, which consists of a signal generating unit 101, an amplifier unit 102, a band-pass filter 103, a radio frequency switch 104, a crystal oscillator 105, a local oscillator 106, a band-pass filter 107, a low noise amplifier 108, a filter 109, an intermediate frequency amplifier 110, an analog-digital conversion module 111 and a digital signal processing module 112. The reader-writer has a double phase-locked loop structure, ensures that the expected frequency can be achieved during transmission and receiving, and provides guarantee for accurately measuring temperature.
Owner:SOUTHWEST JIAOTONG UNIV
Meta-material film for left-hand circular polarization conversion
InactiveCN105161857AWith circular polarization filter functionKeep the functions passedWaveguide type devicesAntennasPhase differenceLight beam
Owner:欧阳征标 +1
Distributed miniature band-pass balance filter
InactiveCN103413993AIn-band flatLow insertion loss in the passbandWaveguide type devicesElectricityEngineering
The invention discloses a distributed miniature band-pass balance filter which comprises a surface mounted 50-ohmage resistance input port, four parallel resonance units, two surface mounted 75-ohmage resistance output ports and a grounded terminal. The input port is connected with the first-stage parallel resonance unit. The two output ports are connected with two strip lines of the fourth-stage parallel resonance unit respectively. The strip lines of the first-stage parallel resonance unit, the second-stage parallel resonance unit, the third-stage parallel resonance unit and the fourth-stage parallel resonance unit are respectively grounded at one end and provided with an open circuit at the other end. Two ends of two Z-shaped interstage coupling strip lines are both grounded. The distributed miniature band-pass balance filter has the advantages of being small in size, light in weight, high in reliability, excellent in electrical performance, simple in circuit implementation structure, low in cost and convenient to use and install.
Owner:NANJING UNIV OF SCI & TECH
Phase shifter, phase shifting component and phase shifting feed network with the phase shifter
ActiveCN104103875APhase shiftingSmall structure sizeWaveguide type devicesAntennasElectricityElectrical conductor
The invention discloses a phase shifting feed network. The phase shifting feed network comprises a plurality of phase shifters, a plurality of power dividing units and a drive unit, wherein each phase shifter comprises a suspended strip-shaped line structure composed of a conductor shielding cover, a second medium board and a U-shaped coupling line thereon, a parallel coupling line and a first medium board with the same, and a metal ground in a successive stacking mode. The first medium boards of the phase shifters are connected to form a connected medium board; the connected medium board is provided with the power dividing units; the phase shifters are symmetrically arrayed in two rows, and the parallel coupling lines of the adjacent phase shifters in the same row are connected through the power dividing units; the drive unit is connected with the second medium board of each phase shifter to synchronously drive several medium boards to move so as to enable the U-shaped coupling lines to move relative to the parallel coupling lines to realize the signal phase shifting. The phase shifting feed network is a hybrid phase shifting feed network which comprises the suspended strip-shaped line and a micro-strip line, and the hybrid phase shifting feed network is capable of realizing the phase shifting of a tunable antenna in higher integration level, better expansibility and more excellent performance.
Owner:COMBA TELECOM TECH (GUANGZHOU) CO LTD +1
Low-profile one-dimensional active transceiving phased-array antenna for satellite communication in motion
ActiveCN103022727AMeet the requirements of the scan rangeLow gain lossPolarised antenna unit combinationsDual linear polarizationRadio frequency signal
The invention discloses a low-profile one-dimensional active transceiving phased-array antenna for satellite communication in motion. The antenna comprises dual-linear-polarization antenna units in inclined and staggered arrangement, flat waveguide dual-channel feed networks, flat waveguide dual-channel miniaturized duplexers, waveguide transition and miniaturized TR components and miniaturized printed board power division networks. The units of the phased-array antenna are dual-linear-polarization waveguide radiators in triangularly inclined and rear-staggered arrangement, so that the antenna is low. By the aid of a method of sharing the same aperture for horizontal polarization and vertical polarization, aperture utilization efficiency of the antenna is increased, a flat waveguide feedback mode is adopted for both horizontal polarization and vertical polarization, loss of the feed networks is reduced, and quite high antenna efficiency is achieved. After passing through the antenna units, the feed networks and the duplexers, dual-polarization signals are subjected to polarization adjustment via polarization adjustment modules in the TR components and are synthesized via pitching surface networks so as to achieve a transceiving function of radio-frequency signals.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
SIC technology-based four-element dual-polarization microstrip antenna array
InactiveCN108493626ABandwidthHigh bandwidthParticular array feeding systemsIndividually energised antenna arraysMicrostrip antenna arrayBroadband
The invention relates to an SIC technology-based four-element dual-polarization microstrip antenna array, which comprises six layers of printed circuit boards and metal supports (6), wherein the lowersurface of a top layer of printed circuit board (17) is printed with rectangular parasitic patches (1); the upper surface of a third layer of printed circuit board (16) is printed with rectangular main patches (2) and a main patch layer reflection plate (11); the upper surface of a fourth layer of printed circuit board (15) is printed with a vertical-polarization feeder line (3) and a ring (8); the upper surface of a fifth layer of printed circuit board (14) is printed with a grounding plate (4); cross gaps (9), circular openings (19) and circular openings (20) are etched on the grounding plate (4); a horizontal-polarization feeder line (5) and a strip line (10) are printed on the lower surface of the fifth layer of printed circuit board (14); and the lower surface of the bottom layer ofprinted circuit board (12) is provided with an antenna bottom reflection plate (13). The SIC technology-based four-element dual-polarization microstrip antenna array has the advantages of wider bandwidth, higher port isolation and lower cross polarization level.
Owner:HARBIN ENG UNIV
Optical add drop multiplexer based on antisymmetric multimode waveguide Bragg grating
InactiveCN105866893ARealize optical signal add-drop multiplexing functionRealize add-drop multiplexing functionWavelength-division multiplex systemsOptical light guidesMultiplexingHigh density
The invention discloses an optical add drop multiplexer based on an antisymmetric multimode waveguide Bragg grating. When being input from a single-mode input waveguide, TE light is converted into a base mode of a multi-mode waveguide when passing through an input gradual change waveguide; the antisymmetric multimode waveguide Bragg grating reversely couples incident light meeting the phase matching condition into one step mode of the multi-mode wave guide; reflecting light is converted into a TE mode of a lower-path single-mode waveguide when passing through a lower-path coupling region; transmission light is output from a single-mode output waveguide through the output gradual change waveguide. Identically, the ET light is input from an upper path single-mode waveguide, an upper-path coupling region converts the TE light into the TE one step mode of the multi-mode waveguide; the antisymmetric multimode waveguide Bragg grating reversely couples the incident light meeting the phase matching conditions into a base mode of the multi-mode waveguide; reflecting light is output from the single-mode output waveguide through the output gradual change waveguide. The optical add drop multiplexer has the advantage that the optical signal add drop multiplexing function is realized, and the optical add drop multiplexer can be applied to an on-chip high-density integrated optical interconnection system.
Owner:LONGYAN UNIV
Right-hand circularly-polarized conversion meta-material film
InactiveCN105044814AWith circular polarization filter functionImprove output beam qualityPolarising elementsNanoopticsMicro structurePhase difference
Owner:SHENZHEN UNIV
Single-pole double-throw switch for radio frequency transceiving switching
PendingCN107994918ASimplify the number of transceiver control voltage circuitsShorten the transmission pathTransmissionTransmitted powerRadar
The invention belongs to the field of radar antenna control, and provides a single-pole double-throw switch for radio frequency transceiving switching. The switch comprises two microstrip lines and aswitch tube core, wherein one end of a first microstrip line is connected with an antenna, and the other end of the first microstrip line is connected with a PA output matching end; one end of a second microstrip line is connected with the antenna, and the other end of the microstrip line is connected with both an LNA input matching end and a drain of the switch tube core Q4; and a source of the switch tube core Q4 is grounded, an inductor L is connected between the drain and the source in parallel, and a gate is a control end. Compared with the traditional single-pole double-throw switch in which two switch tube cores are connected in parallel and grounded and connection statuses of the two switch tube cores are different, the switch provided by the invention has the advantages that the number of switch transceiving control voltages is reduced, and an original control switch in a transmitting circuit and a 1 / 4 wavelength microstrip line connected with the control switch are removed, so that a switch path is simplified, a transmission route for transmitted signals is shortened, the size is reduced, the problem of transmitting power back-off is effectively avoided, and insertion loss of a transmitting output end is further reduced.
Owner:武汉华讯国蓉科技有限公司
Hybrid lumped distribution miniature band-pass filter
InactiveCN102509824ACompact structureSimple structureMultiple-port networksWaveguide type devicesCapacitanceOut of band rejection
The invention relates to a hybrid lumped distribution miniature band-pass filter. The hybrid lumped distribution miniature band-pass filter comprises a 50-ohmage input-output port installed on the surface, four parallel-connection resonance units, two interstage coupling inductors, a interstage coupling capacitor, a Z-shaped cross coupling capacitor and an input / output inductor which are all achieved through the multilayer low-temperature co-fired ceramic technical skill. The hybrid lumped distribution miniature band-pass filter has the advantages of being good in band-pass selectivity and out of band rejection, low in insertion loss, light in weight, small in volume, high in reliability, good in electric performance, phase-frequency characteristic linearity, temperature stability and electric performance batch uniformity, low in cost, capable of being produced massively and the like, and is especially applicable to radars, communication, rocket carrying, plane carrying, missile carrying, spacecrafts, man-portable mobile communication terminals and other wireless communication handheld and portable terminal products and corresponding frequency range systems with strict requirements for volume, weight, electric performance, reliability and the like.
Owner:WUXI NANLIGONG TECH DEV
Filter based on axial direction apodized grating
ActiveCN106896446ARealize downloadLarge toleranceOptical waveguide light guideSingle mode waveguidesSideband
The present invention discloses a filter based on axial direction apodized grating. Input single mode waveguide is connected with the upper end port of the left end of an asymmetrical gradual changing directional coupler through input gradual changing waveguide, and the lower end port of the left end of the asymmetrical gradual changing directional coupler is connected with bending waveguide to realize reflection signal download; and the upper end port of the right end of the asymmetrical gradual changing directional coupler is connected with the left end of an antisymmetrical multimode waveguide grating, and the right end of the antisymmetrical multimode waveguide grating is connected with the output single mode waveguide through output gradual changing waveguide. The separation of grating reflection signals employs the asymmetrical gradual changing directional coupler with large tolerance and small insertion loss to realize download of the grating signals; based on a grating filter, the filter based on axial direction apodized grating is large in tolerance and wide in bandwidth regulation range and cannot be limited by the FSR so as to realize filters with various different bandwidth demands; and moreover, the axial direction position regulation of grating teeth realizes apodization so as to realize a grating filter with large sideband suppression ratio and greatly improve the performance of the grating filter.
Owner:ZHEJIANG UNIV
Antenna system and mobile terminal
ActiveCN107123863ASmall insertion lossReduce high frequency insertion lossAntenna supports/mountingsTelephone set constructionsMulti bandComputer module
The invention relates to an antenna system and a mobile terminal. The antenna system comprises a main set radio frequency front-end module, a diversity radio frequency front-end module, a first antenna and a second antenna. The main set radio frequency front-end module and the diversity radio frequency front-end module are connected with the first antenna and the second antenna respectively; or the main set radio frequency front-end module and the diversity radio frequency front-end module are connected with the second antenna and the first antenna respectively. The main set radio frequency front-end module is provided with N main set antenna ports, wherein the N main set antenna ports are connected with the first antenna or the second antenna simultaneously, N being a natural number, N>1. Besides, one of the main set antenna ports is used for transmitting main set signals at a first frequency band, and the first frequency band is higher than frequency bands of main set signals transmitted by the other main set antenna ports. The antenna system can reduce high-frequency insertion loss; and since the high-frequency insertion loss is larger than low-frequency insertion loss, insertion loss of the antenna system under a multi-band application scene is reduced on the whole.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Broadband dual-polarization base station filter antenna element and array without external filter circuit
PendingCN109004340AGood radiation characteristicsStable radiation characteristicsAntenna supports/mountingsRadiating elements structural formsOut of band rejectionBroadband
The invention discloses a broadband dual-polarization base station filter antenna unit without an external filter circuit and an array thereof. The antenna unit is arranged in the middle of the reflector. The antenna comprises an oscillator arm, a balun and two parasitic metal rings. The vibrator arm is provided with a microstrip line branch, is connected through the balun, and is fed through thebalun, and the balun is provided with a feeder line. The upper part and the lower part of the vibrator arm are respectively provided with parasitic metal rings. The antenna unit has the characteristics of compact and simple structure. The invention realizes good out-of-band rejection effect and has good frequency selectivity without cascading filter, thus avoiding filter insertion loss. The invention realizes high polarization isolation, and realizes stable pattern in wide frequency band at the same time.
Owner:SOUTH CHINA UNIV OF TECH
Antenna switching device and mobile terminal
ActiveCN107135019AImprove performanceReduce switchingSpatial transmit diversityRadio frequency signalRadio frequency front end
The invention relates to an antenna switching device and a mobile terminal. The antenna switching device comprises a main radio-frequency front-end module, a diversity radio-frequency front-end module, a shift switch, a first main antenna, a second main antenna, a diversity antenna and a control module; a first terminal of the main radio-frequency front-end module is connected with the first main antenna, and a second terminal and a third terminal of the main radio-frequency front-end module are respectively connected with the second main antenna via the shift switch; the diversity radio-frequency front-end module is connected with the diversity antenna via the shift switch; and the control module controls the shift switch to be in an idle state by judging a frequency band where a current radio-frequency signal locates when the frequency band where the current radio-frequency signal locates is consistent with a frequency band of radio-frequency signals received and sent by the first main antenna. By fixing the first main antenna on the first terminal of the main radio-frequency front-end module, the radio-frequency signals received and sent by the first main antenna and the switching of the diversity antenna can be reduced, the channel insertion loss is reduced, the performance of the first main antenna is improved, and the user experience is provided.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Gallium arsenide dual-mode band-pass filter and manufacturing method thereof
ActiveCN104466317AStrong coupling characteristicsReduce volumeWaveguide type devicesVIT signalsResonator
The invention provides a gallium arsenide dual-mode band-pass filter and a manufacturing method of the gallium arsenide dual-mode band-pass filter. According to the filter, the requirement for a miniaturized millimeter-wave circuit is met, the insertion loss is small, and the selectivity is high. According to the technical scheme, a loading branch and a lambda / 2 resonator constitute a bent branch line loading type dual-mode resonator of an annular structure; microwave signals fed through an input micro-strip are transmitted to an output micro-strip through two physical channels of the filter, so that frequency selection of a pass band is achieved, wherein according to one channel, the signals are transmitted through an input coupling branch and an output coupling branch, an extra out-of-band transmission zero is provided, and the position of the zero is adjusted through the lengths and the coupling distances of the input coupling branch and the output coupling branch, and according to the other channel, the microwave signals are coupled to the dual-mode resonator through an incoming feeder and then are coupled to the output micro-strip through the dual-mode resonator, two transmission pole pass bands and two transmission zero stop bands are formed by the dual-mode resonator, and one of the transmission pole pass bands and one of the transmission zero stop bands are provided by a dual module of the dual-mode resonator.
Owner:10TH RES INST OF CETC
High-power synthesizer and synthetic method for light satellite-borne synthetic aperture radar (SAR)
ActiveCN104934675AAvoid high power pointsSmall insertion lossCoupling devicesPower combinerSynthetic aperture radar
The invention relates to a high-power synthesizer for a light satellite-borne synthetic aperture radar (SAR). A signal is input to a power divider (in a case of a single feed source, the signal is directly input to an electronic switch), the signal is output to a certain port of an input Butler matrix by the electronic switch, the input Butler matrix is used for performing power division on the signal according to a certain phase relation, the signal is output to a phase shifter group for phase error compensation, the signal is output to a pulse power amplifier group for power amplification after being subjected to phase error compensation by the phase shifter group, the pulse power amplifier group outputs the signal to an output Butler matrix, the output Butler matrix is used for synthesizing the signal to a corresponding output port according to the selective relation of the previous electronic switch, and finally the signal passes through a circulator and then enters an antenna feed source to form corresponding emission wave beams. By adopting the technology disclosed by the invention, the development bottleneck of aerospace high-power pulse power amplification and the on-orbit failure risk of a high-power electronic switch can be avoided, the high-power synthesizer is simple to implement and is high in reliability, and moreover, the wave control function of antenna wave beam switching can be achieved.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Miniature LTCC 1.8-GHz power divider with built-in resistor
ActiveCN104362997ASmall phase differenceEasy to useMultiple-port networksShunt capacitorsPhase difference
The invention discloses a miniature LTCC 1.8-GHz power divider with a built-in resistor. The miniature LTCC 1.8-GHz power divider with the built-in resistor comprises a surface-mounted 50-ohm impedance input port, an input inductor, a first spiral inductor, a second spiral inductor, a ground capacitor, a shunt capacitor, two vertical ports, two first parallel ports, two second parallel ports, the built-in tantalum absorption resistor, a first output inductor, a second output inductor, a first surface-mounted 50-ohm impedance output port, a second surface-mounted 50-ohm impedance output port and a ground plate. The miniature LTCC 1.8-GHz power divider is made of LTCC materials in a three-dimensional integrated mode and has the advantages that use is easy and convenient, the size is small, the isolation degree is high, the insertion loss is low, the phase difference between the two output ports is small, the reliability is high, the electrical performance and the temperature stability are good, the cost is low, and mass production can be achieved.
Owner:深圳波而特电子科技有限公司
Polarization-independent phase-coded quantum key distribution system and method
PendingCN110324145APolarization consistentAchieving Polarization PerturbationKey distribution for secure communicationPhotonic quantum communicationVoltage amplitudePhase Code
The invention discloses a polarization-independent phase encoding quantum key distribution system and method. A sending end comprises a pulse laser, an intensity modulator, an optical fiber isolator,a phase encoding unit and an electrically adjustable attenuator which are connected in sequence. A receiving end comprises an optical fiber circulator, a phase decoding unit, a first single photon detector and a second single photon detector. The phase decoding unit is composed of an unequal-arm Mch (Zehnder) interferometer and a Sagnac ring. Compared with the prior art, polarization changes of along arm and a short arm of an MZ interferometer can be automatically compensated, and polarization consistency of two paths of pulses passing through the long arm and the short arm is ensured so thatchannel polarization disturbance resistance is realized. The requirement on the voltage amplitude of the phase modulator is low. Due to the introduction of the Sagnac ring, two polarization components of one optical pulse respectively pass through the phase modulator from opposite directions, equivalently, the whole optical pulse is only subjected to phase modulation once, so that insertion lossis small, working rate of the system is not limited by the structure and can reach more than GHz, and key productivity is greatly improved.
Owner:赵义博
Radio frequency circuit switch chip, radio frequency circuit, antenna apparatus and electronic device
InactiveCN107070485ASmall insertion lossIncrease flexibilityTransmission path divisionFrequency bandIntermediate frequency
The embodiment of the invention provides a radio frequency circuit switch chip, a radio frequency circuit, an antenna apparatus and an electronic device. In the radio frequency circuit switch chip, an input end of a first switch comprises a high frequency port, the input end of a second switch comprises a medium frequency port and the input end of a third switch is a low frequency port; the first switch selectively turns on a combiner through a fourth switch, and meanwhile the third switch turns on the combiner so as to realize carrier aggregation of high frequency signals and low frequency signals; and the second switch can selectively turn on the combiner through the fourth switch, and meanwhile the third switch turns on the combiner so as to realize the carrier aggregation of medium frequency signals and the low frequency signals. In the scheme, the radio frequency circuit switch chip can switch to control the radio frequency signals of different frequency bands to perform the carrier aggregation, thereby reducing the insertion loss of the radio frequency circuit and improving the carrier aggregation flexibility of the radio frequency signals by the electronic device.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Hexagonal resonant cavity substrate integrated waveguide filter
InactiveCN102723543AHigh unloaded figure of meritHigh selectivityWaveguide type devicesResonant cavityCoupling
The invention relates to a hexagonal resonant cavity substrate integrated waveguide filter. The hexagonal resonant cavity substrate integrated waveguide filter comprises a medium substrate, and upper surface metal copper and lower surface metal copper, which are respectively positioned on the upper and lower surfaces of the medium substrate, wherein plated through holes are arrayed to form a first hexagonal resonant cavity, a second hexagonal resonant cavity and a third hexagonal resonant cavity, which are sequentially connected and are in a shape of regular hexagon; the first hexagonal resonant cavity and the third hexagonal resonant cavity are in mirror symmetry around the central axis of the second hexagonal resonant cavity and are not adjacent; the right upper side edge of the first hexagonal resonant cavity and the left lower side edge of the second hexagonal resonant cavity are coincided and provided with a first sensitive coupling window; the right lower side edge of the second hexagonal resonant cavity and the left upper side edge of the third hexagonal resonant cavity are coincided and provided with a second sensitive coupling window; a coplanar waveguide input end is arranged at the left lower side edge of the first hexagonal resonant cavity; and a coplanar waveguide output end is arranged at the right lower side edge of the third hexagonal resonant cavity.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
On-chip active phase shifter based on vector synthesis
ActiveCN105207644AReduce in quantityReduce power consumptionPhase shifting networksDifferential signalingActive phase
The invention relates to an active phase shifter, and provides an on-chip active phase shifter based on a vector synthesis technology. The on-chip active phase shifter is used for solving the problems that an active phase shifter is high in power consumption and large in phase error and amplitude error. The on-chip active phase shifter based on the vector synthesis technology comprises a power distribution unit, an orthogonal signal generation unit, two differential signal generation units, a signal synthesis unit and an output balun; a single-ended input signal is input to the input end of the power distribution unit, the power distribution unit divides the input signal into two paths of in-phase signals to be output to the orthogonal signal generation unit which produces a group of orthogonal signals to be input to the two differential signal generation units respectively, each differential signal generation unit produces a group of differential signals to be input to the signal synthesis unit, and the signal synthesis unit synthesizes the two groups of the differential signals into one group of differential signal to be input to the output balun. The active phase shifter is simple in structure, capable of effectively improving signal power gain on the condition that the low circuit power consumption and high phase accuracy are guaranteed and suitable for large-scale application and promotion.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Dimmable filter
InactiveCN103018837AEnables tunable filtering performanceSmall insertion lossOptical light guidesOptical communicationLight filter
The invention discloses a dimmable filter which comprises an optical fiber collimator, a beam-expanding system, a diffraction grating, a 4f system and a micro-electromechanical system (MEMS) with a reflector, and also comprises an etalon or a slit aperture. The chromatic dispersion action of the diffraction grating is matched with a filter regulation action of the MEMS technology, so that the dimmable filtering performance of the light filter is realized, and the problem of flattening in optical communication is solved by utilizing the etalon and the slit aperture. The signal filtered by the dimmable filter has high edge steepness and top flatness, and the filter has the advantages of low insertion loss, compact structure, low cost and easiness and convenience in operation.
Owner:FUZHOU PHOTOP QPTICS CO LTD
Multiband wireless signal transceiver system
The invention provides a multiband wireless signal transceiver system which comprises a power amplifier, a frequency switching outputting unit and a monitor, wherein the power amplifier is used for amplifying an inputted wireless signal; the frequency switching outputting unit comprises a transceiver switch used for receiving an output signal of the power amplifier, a first selector switch coupled with the transceiver switch, a filter coupled with the first selector switch and a second selector switch coupled with the filter; the filter comprises a filtering unit which is adaptive to the corresponding sections of the first selector switch and the second selector switch respectively; the monitor comprises a frequency detecting unit and a processing control unit; the frequency detecting unit is used for detecting frequency signals of the power amplifier and the frequency switching outputting unit; and the processing control unit is used for controlling the gain of the power amplifier and the corresponding switching sections of the first selector switch and the second selector switch according to a detecting result of the frequency detecting unit. The multiband wireless signal transceiver system is suitable for wider frequency signals, the cost is lowered and the efficiency is improved.
Owner:深圳市虹远通信有限责任公司
Optical control terahertz wave amplitude modulator based on silicon nanoneedle
InactiveCN105914565AIncrease modulation depthGreat modulation depthSolid masersRefractive indexHigh resistivity silicon
The invention belongs to the field of terahertz imaging technologies, relates to a modulation device in the related field of terahertz imaging, and in particular provides an optical control terahertz wave amplitude modulator based on a silicon nanoneedle. The optical control terahertz wave amplitude modulator comprises a semiconductor laser, an optical fibre, an optical fibre modulator and a terahertz amplitude modulation structure; laser generated by the semiconductor laser enters the optical fibre modulator through optical fibre coupling; the optical control terahertz wave amplitude modulator is characterized in that the terahertz amplitude modulation structure is composed of a silicon-based bottom layer and a silicon nanoneedle tip array on the surface; and the optical fibre modulator outputs modulated laser incident to the surface of the silicon nanoneedle tip array. According to the optical control terahertz wave amplitude modulator disclosed by the invention, a dual-layer structure including the silicon nanoneedle tip array and a high-resistivity silicon / intrinsic silicon layer is adopted; the silicon nanoneedle tip array has the gradient change of a refractive index on the surface of high-resistivity silicon / intrinsic silicon; reflection of terahertz wave and pumping laser can be reduced simultaneously; the insertion loss of the device is obviously reduced; the pumping laser utilization rate is increased; and the device has relatively high modulation depth under relatively low pumping laser power.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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