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160results about How to "Improve isolation" patented technology

Miniaturized dual-band eight-unit MIMO terminal antenna suitable for 5G

The invention discloses a miniaturized dual-band eight-unit MIMO terminal antenna suitable for 5G. The antenna comprises a dielectric substrate, two dielectric side plates and circuits printed on thesurfaces of the three dielectric plates. Feeders of eight antenna units are printed at the upper surface of the dielectric substrate of the antenna, and a metal floor is printed at the lower surface of the dielectric substrate of the antenna; four antenna units and three sets of decoupling structures distributed among the antenna units at intervals are printed at the inner side walls of the two dielectric side plates, each antenna unit is formed by a T-type feed branch and two grounding radiation patches, each grounding radiation patch is formed by a rectangular patch and a bent short-circuitwire, each decoupling structure is a short-circuit metal patch having three bent thin seams, and the antenna units pass through the floor through the feeding points located at the end portions of thefeeders to perform feed of a coaxial inner core. Through optimization design of the antenna units and the decoupling structures, the positions of the antenna units and the decoupling structures are reasonably arranged so that the antenna has the advantages of miniaturization, double frequency bands and high isolation among the antenna units and is suitable for a 5G terminal.
Owner:XIDIAN UNIV

Broadband dual-polarization antenna feeder unit

InactiveCN101197470AAvoid the problem of increased cost of widthImprove isolationPolarised antenna unit combinationsPhysicsFrequency band
The invention provides a dual-polarization broad band antenna feeder unit, which adopts a dipole which uses two striplines to feed to form a crossed structure, is fixed on an earth plate, and forms an angle of plus 45 degrees and an angle of minus 45 degrees with the axis of the earth plate serving as an angle bisector on which a separating metal sheet (27) is fixed. The conduction bands arranged on the upper ends of the two striplines bend and are arranged deviating form central points of respective dipole radiation arms and pass through crosswise up and down at the central points of respective dipole radiation arms and fixed on two radiation arms (7) and (4) which deviate far form the central points. The width of the conduction bands of the striplines, a supporting plate, and the radiation arms are respectively W3, W2 and W1. The distance between the two radiations of the dipole is W4; and the distances form the radiation arms to the central points are W5 and W6. W1, W2, W3, W4, W5, W6 as well as the height, width and position of the metal sheet (27) are all adjustable. The invention has the advantages of the frequency broad bands and an isolation of 30 Db, can compose dual-polarization array antennae, wherein HPBWH is equal to 65 degrees and HPBWH is equal to 90 degrees, for use as base station antennae of double-frequency and tri-frequency.
Owner:西安新海天通信有限公司

Radio-frequency signal perception device based on photoelectric oscillator

The present invention discloses a radio-frequency signal perception device based on a photoelectric oscillator. The device comprises a laser source, a polarization controller, a Mach-Zehnder modulator, an electromagnetic field sensor, an optical fiber coupler, an adjustable radio frequency band-pass filter, a radio-frequency amplifier, an optical filter, an intermediate-frequency band-pass filterand two photoelectric detectors; the laser source, the polarization controller, the Mach-Zehnder modulator, the electromagnetic field sensor and the photoelectric detectors are connected through optical fibers; radio frequency input ports of the photoelectric detectors, the optical fiber coupler, the adjustable radio frequency band-pass filter, the radio-frequency amplifier and the Mach-Zehnder modulator are connected in order; and one output of the optical fiber coupler, the optical fiber, the photoelectric detectors and the intermediate-frequency band-pass filter are connected in order. Theradio-frequency signal perception device achieves intermediate-frequency receiving of the high-frequency broadband electromagnetic field, reduce the cost of receiving the high-frequency device, does not need an external local oscillator, and is simple in electromagnetic sensor structure and good in radio-frequency signals to be received and the isolation of the local oscillator.
Owner:ZHEJIANG UNIV

Electromagnetic wave absorbing body-based high-isolation array antenna

ActiveCN108879079AImprove isolationEnhanced Interference Suppression PerformanceRadiating elements structural formsAntenna couplingsHigh isolationClassical mechanics
The invention discloses an electromagnetic wave absorbing body-based high-isolation array antenna, which comprises a metal bottom plate, wherein four element antennas are vertically arranged on the metal bottom plate, are symmetrically distributed relative to the center of the metal bottom plate and rotate 90 degrees in sequence; an electromagnetic wave absorbing body unit formed by electromagnetic wave absorbing walls is arranged on two vertical axes of the metal bottom plate; each electromagnetic wave absorbing wall is of a double-sided structure and comprises two layers of electromagnetic wave absorbing plates which are laminated back to back; a plurality of evenly spaced microstrip structures are arranged at the front side of each electromagnetic wave absorbing plate; and each microstrip structure comprises a cross-shaped microstrip patch and square annular microstrip lines arranged at the outer side of the cross-shaped microstrip patch. The antenna is applied to a Beidou satellitenavigation system; and spatial electromagnetic waves, close to a factory, of the element antennas are absorbed through the electromagnetic wave absorbing body unit, so that coupling of the spatial waves between the element antennas is reduced and the isolation between the element antennas is improved.
Owner:西安航捷电子科技有限公司

Radio frequency identification reader-writer and method with ultrahigh frequency

The invention provides a radio frequency identification reader-writer and a radio frequency identification method with ultrahigh frequency. The read-writer comprises a control module, an emission module, a directional coupling module, a radio frequency matching module, an antenna module, a vector modulation carrier wave cancellation module, a receiving module, an interface module and a power supply module; on one hand, carrier signal power leaked to a receiving link from the emission module is reduced through matching and increasing the isolation degree of a coupling module, on the other hand, the carrier signal power leaked to the receiving link is reduced through a vector modulation carrier wave cancellation technology. In the radio frequency identification reader-writer and the radio frequency identification method with ultrahigh frequency, the impedance characteristic of a coupler is changed by use of a radio frequency matching technology, the isolation degree is increased, the carrier signal power leaked to the receiving link from the emission module is reduced; the carrier signal power leaked to the receiving link is reduced through the vector modulation carrier wave cancellation technology; and through combination of the two technologies, the carrier signal power leaked to the receiving link is eliminated or reduced to sufficiently small, a tag returning signal is retained, thus the sensitivity of the reader-writer is improved and the read-write distance is increased.
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI

Large-aperture polarization independent high-power isolator

The invention relates to the laser field and discloses a large-aperture polarization independent high-power isolator. The large-aperture polarization independent high-power isolator comprises a first birefringent prism, a 45-degree faraday rotator, a second birefringent prism and a beam combiner, all of which are orderly arranged in the forward transmission direction of a light path, wherein the first birefringent prism and the second birefringent prism both are reflective polarizing beam splitting prisms; a half-wave plate is optically cemented on a light transmission surface at the magneto-optical crystal side of the faraday rotator. The birefringent prisms of the reflective polarizing beam splitting prisms are employed to divide light transmitted in the isolator into two beams of polarized light, the polarization directions of the two beams of polarized light are perpendicular to each other and a large separation angle is formed between the two beams of polarized light, and a pair of total-reflection optical elements is employed to further reflect two sub-beams of the returned light so that the two sub-beams are deviated away from the forward transmitted light, and therefore, the large-aperture polarization independent high-power isolator is realized; the half-wave plate is added on the side of the magneto-optical crystal so that the isolation of the isolator is enhanced, and as a result, the high-power isolator is enabled to be more stable and reliable and can be prevented from being burnt out.
Owner:SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD

Optical isolator

InactiveCN101334506AImprove isolationAdapt to miniaturization requirementsCoupling light guidesCoatingsPolarization mode dispersionEngineering
The invention provides an optical separator, consisting of an inlet optical fibre head, a separation body, two self-focus lenses and an outlet optical fibre head which are sequentially arranged; the separation body consists of a displacement-typed crystal, 45DEG Faraday rotary plate, a half-wave plate and a displacement-typed crystal which are sequentially arranged and fixedly connected with each other; the separated surfaces of the two displacement-typed crystals are parallel to each other, with the same separation quantity and reverse separation directions. The facing surfaces of the inlet optical fibre head and the first self-focus lens are parallel to each other and the facing surfaces of the outlet optical fibre head and the second self-focus lens are parallel to each other; the optical axes of the two self-focus lenses are parallel to each other, with the same focal length and coincident adjacent focal surfaces; the internal end surface of the inlet optical fibre head and the internal end surface of the outlet optical fibre head are arranged at an object/image conjugation position. The optical separator solves the technical problems of large volume and high cost in the background technique, and has the advantages of good separation effect and eliminating the polarization mode dispersion.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI

Multi-target measurement and control ground station system

The invention relates to a multi-target measurement and control ground station system. The system comprises a phased-array antenna subsystem, a receiving and demodulation subsystem and a data processing and monitoring subsystem; the phased-array antenna subsystem comprises an antenna feed module, a digital acquisition module and a digital beam forming module; the antenna feed module comprises a planar array antenna and a blind compensation linear array antenna; the digital acquisition module is used for carrying out power division, filtering, amplification, down-conversion and AD acquisition digitization on multiple paths of radio frequency signals; the digital beam forming module is used for receiving the multiple paths of digital target signals and performing digital beam forming, and each target correspondingly forms one digital beam signal; the receiving and demodulating subsystem comprises a plurality of receiving and demodulating modules and is used for receiving and demodulatingthe plurality of digital beam signals; and the data processing and monitoring subsystem is used for carrying out unified network time service and real-time monitoring on other equipment in the system. The measurement and control requirements of a plurality of large-airspace aircrafts and long-distance aerospace flight targets are met, the problems of cross-modulation and intermodulation interference and ENOB compression under the condition that a plurality of targets are located at different distances are solved, the time service precision is improved, and the system integration is improved.
Owner:CHENGDU FOURIER ELECTRONICS TECH +1
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