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39results about How to "Improve bandwidth characteristics" patented technology
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Aluminum nitride thin film, composite film containing the same and piezoelectric thin film resonator using the same
ActiveUS20070080611A1Improve featuresHigh crystallinityPiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostriction/magnetostriction machinesRocking curveComposite film
A piezoelectric thin film resonator has a substrate and a piezoelectric layered structure including a lower electrode, piezoelectric aluminum nitride thin film with c-axis orientation and upper electrode formed on the substrate in this order. The lower electrode are made of a metal thin film including a layer containing ruthenium as a major component having a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of ruthenium of 3.0° or less. The piezoelectric aluminum nitride thin film formed on the lower electrode has a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of 2.0° or less.
Owner:MEMS SOLUTIONS INC
Aluminum nitride thin film, composite film containing the same and piezoelectric thin film resonator using the same
ActiveUS7482737B2Improvement factorImprove sound qualityPiezoelectric/electrostrictive device manufacture/assemblyImpedence networksRocking curveComposite film
A piezoelectric thin film resonator has a substrate and a piezoelectric layered structure including a lower electrode, piezoelectric aluminum nitride thin film with c-axis orientation and upper electrode formed on the substrate in this order. The lower electrode are made of a metal thin film including a layer containing ruthenium as a major component having a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of ruthenium of 3.0° or less. The piezoelectric aluminum nitride thin film formed on the lower electrode has a full-width half maximum (FWHM) of a rocking curve of a (0002) diffraction peak of 2.0° or less.
Owner:MEMS SOLUTIONS INC
Two-pole notch filter
InactiveUS6842086B1Improve long-term stabilityWider inband bandwidth characteristicMultiple-port networksTunable filtersInductorFrequency response
A tunable top-pole passive notch circuit for attenuating select frequencies of a multi-frequency CATV signal. The circuit includes an input for receiving a multi-frequency CATV signal, and an output for transmitting a portion of the multi-frequency CATV signal, A filter network for attenuating a band of frequencies from the multi-frequency signal is distributed been the input and the output. The filter network includes three parallel branches A, B, and C, each being arranged in series connection between the input and the output. Branch A includes an inductor. Branch B includes an adjustable parallel tank circuit Branch C includes a second adjustable electrical resonator. The filter has frequency response characteristics that are more stable than prior art two-pole notch filters, and similar to the response characteristics of more complex three pole or four pole notch filters. The two-pole tunable notch filter circuit provides a passband response to 1 GHz.
Owner:EAGLE COMTRONICS
Compact multiple-frequency Z-type inverted-F antenna
ActiveUS7265718B2Small sizeHigh gainParticular array feeding systemsSimultaneous aerial operationsDielectric substrateHorizontal axis
A compact multiple-frequency Z-type Inverted-F antenna includes a dielectric substrate having a horizontal axis and a vertical axis perpendicular to the horizontal axis. A feed point is disposed along the horizontal axis on a first side of the vertical axis and a ground strip is disposed along the horizontal axis on a second side of the vertical axis opposite the feed point. A plurality of wedge-shaped radiating traces is arranged symmetrically with respect to the horizontal axis and disposed on the first side of the vertical axis. A plurality of wedge-shaped ground traces symmetrical to the plurality of radiating traces with respect to the vertical axis are disposed on the second side of the vertical axis.
Owner:WISTRON NEWEB
High-isolation double-unit MIMO (multiple input multiple output) antenna array
InactiveCN102832452AEasy to adjustGood impedance characteristicsSimultaneous aerial operationsRadiating elements structural formsDielectric substrateHigh isolation
The invention discloses a high-isolation double-unit MIMO (multiple input multiple output) antenna array which is characterized in that: two independent resonant modes are produced through two C-like radiating units and two inverted-L-shaped radiating units printed on the front and back surfaces of a dielectric substrate, and used for controlling the double frequency characteristics of an antenna; and on the premise of realizing double-frequency coverage, a decoupling structure is formed on an additional floor unit printed on the front surface of the dielectric substrate and an isolation groove formed on a floor, so that the isolation between antenna units in a multi-frequency range is improved, and the bandwidth performance of dual-frequency operation is ensured.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Double-frequency dual-polarization cavity backed slot antenna
ActiveCN102842757ACompact structureSmall sizeRadiating elements structural formsPolarised antenna unit combinationsMetallic foilFrequency spectrum
The invention discloses a dual-frequency dual-polarization cavity backed slot antenna which is compact in structure. The dual-frequency dual-polarization cavity backed slot antenna is divided into an upper structure, an intermediate structure and a lower structure, wherein in the upper structure (1), a single metal sheet (11) and a dielectric supported metal foil (12) of a metal round slot director which are used as antenna directors are positioned on a dielectric plate (23); in the intermediate structure (2), a double-arm feed circuit (22) is positioned above the dielectric plate (23), and a crisscross slot metal surface (24) is positioned below the dielectric plate (23); and the lower structure (3) is a rectangular or elliptical metal waveguide cavity or a rectangular or elliptical SIW (Substrate Integrated Waveguide) cavity. According to the dual-frequency dual-polarization cavity backed slot antenna, because the rectangular or elliptical waveguide cavity generates required dual-frequency resonant frequency and the antenna generates effective radiation on dual frequency bands by the special directors, a dual-frequency dual-polarization working mode is achieved, frequency spectrum sharing and efficient information transmission are realized in different frequency bands and the frequency spectrum utilization rate is increased.
Owner:SOUTHEAST UNIV
Bandwidth wireline data transmission system and method
InactiveUS20050219063A1Increasing data transmission rateImprove bandwidth characteristicsSeismology for water-loggingElectric/magnetic detectionLoad carryingData transmission systems
A suspended well logging apparatus is provided having downhole well data acquired by a sensor, transmitted to the surface via complementary modems, and conveyed to the surface modem via a data transmission cable linking the modems, the cable having at least one twisted pair of signal conductors positioned within an outer protective sheath, each of the conductors being separately insulated, the at least one twisted pair of signal conductors having a twist rate of at least ⅙ twist per inch, an insulation sheath surrounding the twisted pair of conductors and a tensile load carrier surrounding the insulation sheath, the load carrier comprising a sheath of tensile load carrying filaments enabling self support of the well logging cable.
Owner:BAKER HUGHES INC
Gradual refractive index bending resistant multimode optical fiber
InactiveCN102692675AImprove transmission bandwidthReduce macrobending additive attenuationOptical fibre with graded refractive index core/claddingOptical fibre with multilayer core/claddingRelative refractive indexNumerical aperture
The invention relates to a gradual refractive index bending resistant multimode optical fiber, which includes a sandwich layer and a cladding, and is characterized in that the radius of the sandwich layer is 20 to 50 microns; the refractive index of the sandwich layer is distributed in a gradient gradation type, the distribution power exponent Alpha is 1.89 to 1.97, and the maximum relative refringence delta 1% max of the sandwich layer is 0.9% to 2.72%; the inner cladding is arranged adjacent to the sandwich layer, the radius of the inner cladding is 22 to 57 microns, and the relative refringence delta 2% is minus 0.02% to 0.02%; and a middle cladding and an outer cladding are arranged outwards the inner cladding sequentially, the middle cladding is a pure quartz glass layer, the radius of the middle cladding is 32 to 60 microns, the relative refringence delta 3% is minus 0.01% to 0.01%. The gradual refractive index bending resistant multimode optical fiber provided by the invention not only reduces the bending dissipation of the optical fiber, but also guarantees that optical fiber has high transmission bandwidth at a 1300 nm window, effectively improves the light collection and concentration capabilities of the optical fiber to LEDs, VCSELs or LDs through increasing the core diameter and numerical aperture, and improves the coupling fault-tolerant capability of luminous devices, namely between the light source and the light transmitting device, i.e. between optical fibers.
Owner:EVERPRO TECH COMPANY
Rapid response power conversion device
InactiveUS6957631B2Improve bandwidth characteristicsRapidly provide energy and energyFree piston enginesSecondary air addition to fuelEnergy transferExternal application
An apparatus and method for extracting energy from an internal combustion engine includes a chamber having a primary piston and a secondary piston with a combustion portion of the chamber situated adjacently between the primary piston and secondary piston. The secondary piston includes a substantially lesser mass than that of the primary piston. The chamber includes at least one fluid port for supplying fuel to the combustion portion and an out-take port for releasing combustive exhaust. The chamber includes a controller for controlling the combustion therein at selected cycles of the primary piston. The secondary piston is configured to draw a portion of energy from combustion controlled by the controller in the chamber. Such portion of energy is provided with a rapid response to an energy transferring portion interconnected to the secondary piston, which in turn, transfers and / or converts the energy for acting on a load or external application.
Owner:SARCOS LC
Personnel security information collecting system based on wireless ad hoc network and working method thereof
InactiveCN103957279AImprove bandwidth characteristicsReal-timeNear-field transmissionNetwork topologiesWireless ad hoc networkBluetooth
The invention discloses a personnel security information collecting system based on a wireless ad hoc network and a working method thereof and belongs to the field of electronic devices, wireless communication and the GPS positioning technology. According to the personnel security information collecting system, intelligent bracelet terminals collect security information periodically and transmit the information to a portable application terminal through a wireless communication base station, and the portable application terminal displays coordinates and the security information of the intelligent bracelet terminals through a map and performs unified management on all the intelligent bracelet terminals. The personnel security information collecting system has real-time performance and intelligent performance, and is applicable to various scenes of production and life. The intelligent bracelet terminals and the wireless communication base station perform ad hoc networking through ZigBee, and the wireless communication base station is communicated with the portable application terminal through bluethooth. By adopting the bluetooth and the ZigBee, complementation of advantages of the bluetooth and the ZigBee is achieved, and a flexible ad hoc network function and low power consumption of a ZigBee protocol and high bandwidth of the bluetooth are made full use of.
Owner:DALIAN UNIV OF TECH
Compact Multiple-frequency Z-type Inverted-F Antenna
ActiveUS20070164906A1High gainFirmly connectedParticular array feeding systemsSimultaneous aerial operationsDielectric substrateHorizontal axis
A compact multiple-frequency Z-type Inverted-F antenna includes a dielectric substrate having a horizontal axis and a vertical axis perpendicular to the horizontal axis. A feed point is disposed along the horizontal axis on a first side of the vertical axis and a ground strip is disposed along the horizontal axis on a second side of the vertical axis opposite the feed point. A plurality of wedge-shaped radiating traces is arranged symmetrically with respect to the horizontal axis and disposed on the first side of the vertical axis. A plurality of wedge-shaped ground traces symmetrical to the plurality of radiating traces with respect to the vertical axis are disposed on the second side of the vertical axis.
Owner:WISTRON NEWEB
Slot printing monopole ultra-wideband antenna
InactiveCN101777691ASimple structureSmall reflection coefficientAntenna supports/mountingsRadiating elements structural formsRadiation propertiesDielectric substrate
The invention discloses a slot printing monopole ultra-wideband antenna, and relates to an ultra-wideband antenna. The invention provides the slot printing monopole ultra-wideband antenna with small size, large bandwidth, lower return loss, simple structure and omnidirectional radiation property. The slot printing monopole ultra-wideband antenna is provided with a dielectric substrate, a rectangular and trapezoidal structural array body is printed on the dielectric substrate, the lower bottom of the trapezoid is placed on the rectangle in the middle, the array body is provided with a slot, the array body is reversely placed at the top end of the dielectric substrate, the lower edge of the array body is connected with a microstrip line, the microstrip line is connected with a radiating element, and the microstrip line extends to the edge of the dielectric substrate; and the lower end of the back of the dielectric substrate is provided with a grounding plane, and a clearance is formed between the grounding plane and the array body on the facade of the dielectric substrate.
Owner:XIAMEN UNIV
Segmented microstrip patch antenna with exponential capacitive loading
InactiveUS7061431B1Improve bandwidth characteristicsHigh bandwidthSimultaneous aerial operationsRadiating elements structural formsCapacitanceMicrostrip patch antenna
A segmented patch antenna has a dielectric material substrate, a plurality of primary electrically conductive segments consecutively disposed on the dielectric material substrate and spaced apart so that a portion of the substrate is exposed between any pair of adjacent primary segments, and a layer of dielectric material disposed over the primary segments. Secondary electrically conductive segments are disposed over the layer of dielectric material wherein each secondary segment corresponds to a pair of adjacent primary segments. Each secondary segment overlaps a portion of each primary segment of the corresponding pair of adjacent primary segments to which that secondary segments corresponds. The overlap of each secondary segment with a portion of each primary segment in a pair of adjacent primary segments produces a plurality of capacitive gaps that capacitively couple the primary and secondary segments together to define a single antenna.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
Mobile terminal having antenna
InactiveUS20200403322A1Improve isolationImprove bandwidth characteristicsSimultaneous aerial operationsAntenna supports/mountingsPatch antennaFrequency band
A mobile terminal according to the present invention, comprises: a first patch antenna operating in a first frequency band and having a circular or polygonal shape; and a second patch antenna operating in a second frequency band that is higher than the first frequency band and having a shape different from the shape of the first patch antenna, wherein through the patch antennas having different shapes, isolation between the antennas operating in different frequency bands can be improved.
Owner:LG ELECTRONICS INC
1090ES signal expansion method based on phase modulation
InactiveCN104539567AImprove bandwidth characteristicsSolve the problem of synchronization of multiple bills and receiptsMulti-frequency code systemsTransmitter/receiver shaping networksVIT signalsPhase transition
The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic management monitoring. The process of signal processing includes the following steps that data information is collected by a signal transmitting terminal, phase dual modulation is carried out on PPM and a sub-pulse, an expansion signal is transmitted, the expansion signal is received and synchronized by a signal receiving terminal, and demodulation is carried out on PPM information and phase information. The key technology and effect are characterized in that in the modulation process, a piecewise linearity phase transition method is used to solve a frequency spectrum problem caused by phase mutation, and a band width character of an expanded 1090ES signal is improved effectively; in the carrier-frequency synchronization process, twice synchronization is performed by using a front guide pulse and a four-digit pulse, the quickness and accuracy of the synchronizations are guaranteed, and a special synchronization problem of multiple output and single input of an ADS-B receiver is solved effectively; in the base band phase information demodulation process, a phase judgment method based on error forward feedback is used, and the accuracy of the phase judgment is improved effectively.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA
Multi-frequency band novel Koch fractal antenna for mobile terminal
InactiveCN106058448AFulfil requirementsMultiple communication bandsSimultaneous aerial operationsRadiating elements structural formsPower flowOptimal control
The invention discloses a multi-frequency band novel Koch fractal antenna for a mobile terminal. The fractal antenna includes a radiator, a ground plate, a medium substrate, and a feed line. The radiator, the feed line, and the ground plate cover the right side of the medium substrate. The back side of the medium substrate is also designed with an inductance loop. The radiator adopts a Koch fractal structure with a central position hollowed, and the hollowed structure is of a Koch fractal structure which is arranged in the same orientation as the radiator. According to the invention, the fractal antenna conducts optimal control on the hollowed structure of the radiator main body of the antenna and an added loop mechanism to change the direction of the current on a metal surface of the antenna, so that the radiation of multi-frequency band mode is achieved.
Owner:BEIJING UNIV OF POSTS & TELECOMM
LED (Light Emitting Diode) display screen control device and control method capable of randomly arranging pixels
ActiveCN112967666AImprove bandwidth characteristicsMeet display needsStatic indicating devicesLED displayHigh bandwidth
The invention provides an LED display screen control device and control method capable of carrying out pixel random arrangement, and the device comprises a decoding chip which is used for decoding a video source signal into a TTL video signal; a coding chip which is used for coding the VESA standard signal into a differential signal; a SRAM array which is used for storing TTL video signals; a SPIFLASH which is used for storing an address table; a SDRAM which is used for transferring the address table; an FPGA module which is used for randomly reading the video pixel data stored in the SRAM array according to the address table; and a MCU which is used for configuring and monitoring the coding chip, the decoding chip and the FPGA module. According to the method, the high-bandwidth characteristic of the SDRAM during continuous access and the high-bandwidth characteristic of the SRAM during random access are fully combined, the output picture is changed in the mode that the address table is issued through software, and the display requirement of multi-scene change is met.
Owner:南京磊积科技有限公司
Single-chip integrated wavelength division multiplexing single-fiber bidirectional data transmission module
ActiveCN108833016AReduce volumeSolve the problem of low bandwidth isolation at the edgeOptical light guidesBidirectional transmissionDecompositionSingle fiber
The invention proposes a single-chip integrated wavelength division multiplexing single-fiber bidirectional data transmission module, and the module comprises a wavelength division multiplexing module, a wavelength division demultiplexing module and an optical circulator. A first comb filter, a second comb filter and a third comb filter are integrated on the wavelength division multiplexing module, and the first end and the second end of the first comb filter and the first end and the second end of the second comb filter respectively serve as the input ends of the wavelength division multiplexing module for receiving four optical signals with different wavelengths. A fourth comb filter, a fifth comb filter and a sixth comb filter are integrated on the wave demultiplexing module. The firstend and the second end of the fourth comb filter and the first end and the second end of the fifth comb filter respectively serve as four output ends of the wave decomposition demultiplexing module for outputting four optical signals with different wavelengths. PBSs in the optical circulator are prepared by the optical waveguide technology, and a single-mode optical waveguide between the PBSs arelaterally grooved, and a polarization conversion component is inserted, thereby realizing the loop transmission of the optical signals between the three ports.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Shorting pin loading-based cavity-backed slot antenna of substrate integrated waveguide
ActiveCN108808253AImprove bandwidth characteristicsImprove directivityAntennas earthing switches associationSlot antennasResonanceDielectric substrate
The invention discloses a shorting pin loading-based cavity-backed slot antenna of a substrate integrated waveguide. The antenna comprises a dielectric substrate body, a first shorting pin group, a second shorting pin group, a third shorting pin group, a feed joint and a slot structure, wherein the dielectric substrate body has a surface and a back surface; the feed joint is in end connection withone side edge of the dielectric substrate body, and is connected with the surface and the back surface of the dielectric substrate body; the slot structure is a slit formed in the back surface of thedielectric substrate body, and is a radiating of the antenna; the first shorting pin group, the second shorting pin group and the third shorting pin group longitudinally pass through the surface andback surface of the dielectric substrate body; the first shorting pin group encloses a waveguide cavity along the outer edge of the dielectric substrate body, and a first-stage cavity film, two second-order cavity films and a third-order cavity film are formed in the cavity; the second shorting pin group and the third shorting pin group are disposed inside the cavity, so that the first-stage cavity film and the two second-order cavity films are coupled to the third-order cavity film, and a four-resonance broadband property can be realized.
Owner:SUN YAT SEN UNIV
Radio frequency power amplifier with push-pull structure
InactiveCN101888216ARealize the structureImprove circuit efficiencyPush-pull amplifiersPhase-splittersCommon emitterAudio power amplifier
The invention discloses a radio frequency power amplifier with a push-pull structure, which comprises an input matching network connected with the input end of the power amplifier, an output matching network connected with the output end of the power amplifier and a power amplifier circuit connected between the input matching network and the output matching network, and an output-stage circuit of the power amplifier circuit is a second-stage NPN-NPN push-pull power amplifier circuit which mainly consists of a second common collector amplifier tube and a second common emitter amplifier tube. The radio frequency power amplifier with the push-pull structure can lead the push-pull structure to be applied in the field of the radio frequency power amplifiers through the HBT process, and realize the integration of linearity and efficiency.
Owner:SUZHOU INNOTION TECH
Bandwidth Wireline Data Transmission System and Method
InactiveUS20070188346A1Improve bandwidth characteristicsImprove data transfer rateSeismology for water-loggingElectric/magnetic detectionElectrical conductorModem device
Owner:BAKER HUGHES INC
High-isolation double-unit MIMO (multiple input multiple output) antenna array
InactiveCN102832452BAchieving dual frequency featuresEasy to adjustSimultaneous aerial operationsRadiating elements structural formsDual frequencyDielectric substrate
The invention discloses a high-isolation double-unit MIMO (multiple input multiple output) antenna array which is characterized in that: two independent resonant modes are produced through two C-like radiating units and two inverted-L-shaped radiating units printed on the front and back surfaces of a dielectric substrate, and used for controlling the double frequency characteristics of an antenna; and on the premise of realizing double-frequency coverage, a decoupling structure is formed on an additional floor unit printed on the front surface of the dielectric substrate and an isolation groove formed on a floor, so that the isolation between antenna units in a multi-frequency range is improved, and the bandwidth performance of dual-frequency operation is ensured.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Improved multimode optical fiber and its prepn. method
InactiveCN1198157CImprove bandwidth performanceNo need to change the composition of the structureGlass making apparatusOptical light guidesNetworked systemMaterials science
The present invention relates to a multimode optical fiber and a manufacturing method thereof. The diameters of the core layer and the cladding layer of the multimode optical fiber are 50 μm and 125 μm respectively, and its refractive index distribution is precisely optimized at a wavelength of 850 nm. The differential mode delay test curve of the optical fiber is: A continuous rising or falling curve, and its maximum change is less than 0.22ps / m, the full injection bandwidth is greater than 1500MHz·km at 850nm, greater than 600MHz·km at 1300nm, and the effective bandwidth is greater than 2000MHz·km and 600MHz·km at 850nm and 1300nm respectively. In its manufacturing method, the deposition rate is from 2.5g / min to 1.5g / min, the flow rate of germanium vapor is from 3% to 60%, and the diameter of the shrinkage hole is controlled to be between 2 and 8mm in diameter during melting and shrinkage, and then the C 2 f 6 The corrosive gas corrodes the inner tube wall; the optical fiber is rubbed during the drawing process. The invention completely eliminates the center depression of the multi-mode optical fiber, reduces inter-mode delay, increases the bandwidth of the optical fiber, and can be used not only in high-speed network systems, but also in low-speed network systems.
Owner:SICHUAN LEFEI OPTOELECTRONICS TECH CO LTD
Planar multi-port high-isolation broadband triplexer integrated antenna
ActiveCN113675607AImprove bandwidth characteristicsImproved far-field radiationSimultaneous aerial operationsAntennas earthing switches associationDielectric plateCoplanar waveguide
The invention discloses a planar multi-port high-isolation broadband triplexer integrated antenna, which belongs to the field of antennas. The antenna is based on a single-layer dielectric plate, the lower surface of the antenna is a grounding metal patch, two symmetrical square grooves are etched, and the two square grooves are connected through a gap strip to form a dumbbell-shaped groove; the upper surface is provided with a partial feed structure and is provided with three ports; the feed network of the first port and the feed network of the third port are located on the top layer of the dielectric plate, the feed lines are perpendicular to each other, the feed network of the second port is right opposite to the third port, and the feed network of the second port and the ground plane are jointly attached to the bottom layer of the dielectric plate; the first port is slot coupling feeding and is composed of a feeder line and a stepped impedance resonator; the second port is coplanar waveguide feed and comprises a feeder line and symmetrical Y-shaped microstrip branches; the third port is a coupling feed port and comprises a feed microstrip line and a T'-shaped microstrip line stub, the three feed ports are excited at the same time, simultaneous sending and receiving of the antenna are achieved, and different feed modes are beneficial to achieving high port isolation.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Double-frequency dual-polarization cavity backed slot antenna
ActiveCN102842757BCompact structureSmall sizeRadiating elements structural formsPolarised antenna unit combinationsMetallic foilFrequency spectrum
Owner:SOUTHEAST UNIV
A 1090es signal expansion method based on phase modulation
InactiveCN104539567BImprove bandwidth characteristicsSolve the problem of synchronization of multiple bills and receiptsMulti-frequency code systemsTransmitter/receiver shaping networksMulti inputFrequency spectrum
The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic control surveillance. The signal processing process includes: collection of data information by the signal transmitter, dual modulation of PPM and sub-pulse phase, transmission of expansion signals, reception and synchronization of expansion signals by the signal receiver, demodulation of PPM information and phase information. The key technologies and effects are: 1. The modulation process adopts the segmented linear phase transition method to solve the spectrum expansion problem caused by the phase mutation, which effectively improves the bandwidth characteristics of the 1090ES signal after capacity expansion; 2. The carrier frequency synchronization process uses the leading pulse and 4-bit data The pulse is synchronized twice, which ensures the fast and accurate synchronization, and effectively solves the special multi-send and single-receive synchronization problem of the ADS-B receiver; 3. The demodulation process of the baseband phase information adopts a phase based on error forward feedback Judgment method effectively improves the accuracy of phase judgment.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Ultra-wide antenna with the base-integrated wave guide feedback structure
InactiveCN1996662BRealize omnidirectional radiationImproving Impedance MatchingRadiating elements structural formsUltra wideband antennasCoplanar waveguide
Owner:SHANGHAI JIAOTONG UNIV
A single-chip integrated wavelength division multiplexing single-fiber bidirectional data transmission module
ActiveCN108833016BReduce volumeSolve the problem of low bandwidth isolation at the edgeOptical light guidesElectromagnetic transceiversOptical circulatorSingle fiber
The invention proposes a single-chip integrated wavelength division multiplexing single-fiber bidirectional data transmission module, and the module comprises a wavelength division multiplexing module, a wavelength division demultiplexing module and an optical circulator. A first comb filter, a second comb filter and a third comb filter are integrated on the wavelength division multiplexing module, and the first end and the second end of the first comb filter and the first end and the second end of the second comb filter respectively serve as the input ends of the wavelength division multiplexing module for receiving four optical signals with different wavelengths. A fourth comb filter, a fifth comb filter and a sixth comb filter are integrated on the wave demultiplexing module. The firstend and the second end of the fourth comb filter and the first end and the second end of the fifth comb filter respectively serve as four output ends of the wave decomposition demultiplexing module for outputting four optical signals with different wavelengths. PBSs in the optical circulator are prepared by the optical waveguide technology, and a single-mode optical waveguide between the PBSs arelaterally grooved, and a polarization conversion component is inserted, thereby realizing the loop transmission of the optical signals between the three ports.
Owner:HUAZHONG UNIV OF SCI & TECH +1
A LED display screen control device and control method capable of arbitrarily arranging pixels
ActiveCN112967666BImprove bandwidth characteristicsMeet display needsStatic indicating devicesComputer hardwareLED display
The invention provides a control device and a control method for an LED display screen capable of arbitrarily arranging pixels. The device includes: a decoding chip for decoding a video source signal into a TTL video signal; an encoding chip for converting VESA standard signals Encoded into differential signal; SRAM array, used to store TTL video signal; SPIFLASH, used to store address table; SDRAM, used to transfer address table; FPGA module, used to randomly read video pixels stored in SRAM array according to the address table Data; MCU, used to configure and monitor the encoding chip, decoding chip and FPGA module. The invention fully combines the high-bandwidth characteristics of SDRAM in continuous access and the high-bandwidth characteristics of SRAM in random access, and changes the output screen by issuing an address table through software to meet the display requirements of multi-scene changes.
Owner:南京磊积科技有限公司
Slot printing monopole ultra-wideband antenna
InactiveCN101777691BSimple structureSmall reflection coefficientAntenna supports/mountingsRadiating elements structural formsUltra-widebandDielectric substrate
The invention discloses a slot printing monopole ultra-wideband antenna, and relates to an ultra-wideband antenna. The invention provides the slot printing monopole ultra-wideband antenna with small size, large bandwidth, lower return loss, simple structure and omnidirectional radiation property. The slot printing monopole ultra-wideband antenna is provided with a dielectric substrate, a rectangular and trapezoidal structural array body is printed on the dielectric substrate, the lower bottom of the trapezoid is placed on the rectangle in the middle, the array body is provided with a slot, the array body is reversely placed at the top end of the dielectric substrate, the lower edge of the array body is connected with a microstrip line, the microstrip line is connected with a radiating element, and the microstrip line extends to the edge of the dielectric substrate; and the lower end of the back of the dielectric substrate is provided with a grounding plane, and a clearance is formed between the grounding plane and the array body on the facade of the dielectric substrate.
Owner:XIAMEN UNIV
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