161results about How to "Band width" patented technology

The present application provides an antenna assembly and an electronic device. The antenna assembly comprises a first radio frequency signal source, a first antenna radiator, a second antenna radiator, a first adjustment circuit, a second adjustment circuit, a mode switch and a controller, wherein the controller generates first, second and third control signals, the first radio frequency signal source generates a first radio frequency signal, the first adjustment circuit adjusts an equivalent electrical length of the first antenna radiator under the control of the first control signal to generate first electromagnetic wave signals of different bands, the second antenna radiator comprises a first portion arranged at a preset clearance away from the first antenna radiator, the first portioncouples the first electromagnetic wave signals to generate second electromagnetic wave signals, and when the mode switch is in a first state under the control of the second control signal, the secondadjustment circuit is electrically connected with the first portion, and the second adjustment circuit adjusts the equivalent electrical length of the first portion under the control of the third control signal to radiate the second electromagnetic wave signals.

The invention discloses rare-earth doped oxyfluoride tellurate scintillation glass and a preparation method thereof. Raw materials TeO2, PbF2, BaF2 and Gd2O3 of the scintillation glass are high-density compounds, so the obtained oxyfluoride tellurate glass has high density, and the density can reach over 6g / cm<3>. Compared with the traditional scintillation glass containing the raw materials PbO, Bi2O3 and the like according to the raw material formula, the scintillation glass of the invention has high short wavelength blue-violet light transmittance and avoids self absorption of the glass; wide wave band also can transmit visible light; the Gd2O3 raw material contained in the scintillation glass can sensitize the luminescence of rare-earth ions such as Tb3+, Ce3+ and the like and greatly improves the output of scintillation light; therefore, the scintillation glass has the advantages of high density, strong scintillation light emission and output, wide wave band and good short wavelength transmission performance. The preparation method for the scintillation glass is simple and has low production cost.

The invention provides an antenna, and an antenna switching method and device, and is used for solving the problem that at present an existing antenna is difficult to cover a relatively broad frequency band. The antenna includes at least two main feed points, at least one ground feed point, a matching circuit and a change-over switch, the main feed points and the ground feed point are accessed to an antenna circuit or disconnected with the antenna circuit through the change-over switch, and the scheme enables the antenna to cover a broader frequency band.

The invention discloses an onboard goggle-type helmet display optical system, and provides a large-field optical display system. The optical display system comprises an image source, a relay lens assembly, a prism assembly and a concave surface reflector along optical axis direction in sequence, wherein, the concave surface reflector receives and reflects image light of the image source from the prism assembly; the concave surface reflector has a bending angle corresponding to the image source, thus asymmetric astigmation is generated in the reflection image; the bending angle is defined as an included angle between an optical axis and a normal line of each point of the inner surface of the concave surface reflector; the relay lens assembly is composed of three groups of a front group, a middle group and a rear group; each group respectively comprises a plurality of lens; the front group closes to the prism assembly, the rear group closes to the image source, and the middle group is positioned between the front group and the rear group in the optical axis direction; the three groups of the front group, the middle group and the rear group can be respectively used as a whole to translate and rotate to form a crossing angle between the local area shafts of the front group lens, the middle group lens and the rear group lens, thus compensating the asymmetric astigmation of the optical display system.

The invention relates to a no-blocking pure reflection optical system. The system is of an eccentric three-mirror structure and comprises a primary mirror, a secondary mirror, an aperture diaphragm, a ternary mirror and a detector focal plane which are arranged along the optical path from the object space to the image space in sequence, wherein the primary mirror, the secondary mirror and the ternary mirror are all reflecting mirrors, the primary mirror is a concave-paraboloid mirror, the secondary mirror is a convex hyperboloidal mirror, and the ternary mirror is a free-form-surface mirror; light is reflected on the surface of the primary mirror, the surface of the secondary mirror and the surface of the ternary mirror in sequence and blocking is avoided, and light reflected by the three mirrors irradiates on the focal plane perpendicularly. The system has the advantages of being wide in wave band, large in visual field, small in distortion, small in F number, free of blocking, telecentric in image space, free of chromatic aberration or thermal aberration and the like and is suitable for high-resolution observation.

The invention discloses a Fe-Co alloy / C composite nanofiber microwave absorbent. The Fe-Co alloy / C composite nanofiber microwave absorbent comprises Fe-Co alloy nanoparticles and carbon nanofiber, wherein the Fe-Co alloy nanoparticles are distributed in the carbon nanofiber or on the surface of the carbon nanofiber uniformly, and are wrapped by a graphitized carbon layer. The invention also discloses a preparation method of the Fe-Co alloy / C composite nanofiber microwave absorbent. The method combines electrostatic spinning with later-stage heat treatment to prepare the Fe-Co alloy / C composite nanofiber microwave absorbent by a one-step method, is simple in process, low in cost and high in yield, and can continuously prepare a large amount of the target product Fe-Co alloy / C composite nanofiber microwave absorbents. The Fe-Co alloy / C composite nanofiber microwave absorbent prepared by the method is a wave absorbing material with excellent comprehensive performance, has the advantages of light weight, wideband, strong absorption performance, convenient, adjustable electromagnetic parameters and the like, and has an excellent application prospect in the technical fields of electromagnetic stealth, electromagnetic shielding, resistance to electromagnetism radiation interference and the like.

The invention discloses a cobalt / graphene composite nano wave-absorbing material and a preparation method thereof, and belongs to the field of wave-absorbing materials. The cobalt / graphene composite nano wave-absorbing material is composed of cobalt and graphene, and the cobalt is loaded on the surface of the graphene. According to the cobalt / graphene composite nano wave-absorbing material and the preparation method thereof, a chemical oxidation-reduction method is used for preparing the graphene, and then nano cobalt particles are loaded on the surface of the graphene through a chemical plating method. Plating is conducted by one hour under the condition of 70 DEG C, the prepared composite material has wide wave-absorbing frequency bands, when the matched thickness is 2 mm, the frequency band with the reflectivity smaller than -10 dB is 12.5-17.5 GHz, and the maximum absorption is -12.5 dB when the frequency band is about 15.5 GHz.

The invention relates to a satellite constellation system for solar burst-near-earth space environment response detection, which comprises three or more satellites, the three satellites are respectively distributed on two non-coplanar and heteroid sun-synchronous orbits, each satellite further comprises an integrated electronic computer, a sun observation load and a near-earth space environment detection load, both the sun observation load and the near-earth space environment detection load are connected with the integrated electronic computer, the integrated electronic computers directly communicate with a ground station on the earth, and moreover, the integrated electronic computers of the three satellites are self-networked for communication. The satellite constellation system can be used for observing solar burst activities and the causal response of the near-earth space environment at the same time, is applicable to the integrative research of solar activity-near-earth space environment change, and has the advantages of multi-satellite networking, different-orbit and heterogeneous distribution, broad wave band, multiple layers, causal chain observation and low cost.

The invention relates to a device and a method for generating a double-layer plasma photon crystal. The device comprises a vacuum reaction chamber, two water electrodes and a plasma generation power supply, wherein the two water electrodes are arranged in the vacuum reaction chamber and provided with opposite pole plates; and the plasma generation power supply is electrically connected with the water electrodes. The device is characterized in that two borders with different thicknesses, which are used as the boundaries of a discharge air gap, are arranged between the two water electrodes; a dielectric plate is arranged between the two borders; and the borders and the dielectric plate are respectively perpendicular to the axial lines of the two water electrodes. According to the device and the method disclosed by the invention, the double-layer plasma photon crystal is realized for the first time; and the double-layer plasma photon crystal has the advantages of fixed lattice constant proportion and different symmetries and achieves the purpose that optical transmission is regulated by regulating lattice symmetry, so that the double-layer plasma photon crystal has wide in application field and application prospect.

The invention discloses an integrated noise parameter measuring device and method and belongs to the technical field of electronic test. The integrated noise parameter measuring device comprises an Sparameter measuring module, an electronic impedance tuner Zx, a noise measuring module and a local oscillator; the S parameter measuring module comprises a signal source, reference coupler CR1, reference coupler CR2, reference measuring receiver R1, reference measuring receiver R1, port coupler CP1, port coupler CP2, measuring receiver A and measuring receiver B; the noise measuring module comprises switch circuit SW and noise power measuring circuit NR; the port coupler CP1 is connected with port 1, and the port coupler CP2 is connected with port 2. The S parameter measuring module, the noisemeasuring module, the electronic impedance tuner and the local oscillator are integrated in a case; noise parameters, noise coefficient and S parameter can be precisely and quickly measured at the same time for a test piece; the device and method have the advantages of good calibration convenience, high measuring precision, high speed and the like.

The present invention provides an antenna device which comprises a metal frame which comprises a first end part and a second end part opposite to the first end part. One end of the first end part extends to form a low frequency radiation part, and the other end extends to form a high frequency radiation part opposite to the low frequency radiation part. The low frequency radiation part is used for connecting a low frequency circuit to receive and send a low frequency signal. The high frequency radiation part is used for connecting a high frequency circuit to receive and send a high frequency signal. The metal frame is the frame of a mobile terminal. The invention also provides the mobile terminal.

The invention provides a mobile terminal and a multiband aerial used on the same, belonging to the field of basic electric elements. The multiband aerial comprises a grounding part, a first radiation part and a first feed part arranged on the first radiation part, wherein the first radiation part comprises a first radiation arm and a second radiation arm, and the first radiation arm is formed by upwards extending from one side of the two opposite sides of the grounding part and is provided with at least one first gap; the second radiation arm is formed by extending from the side opposite to the jointing side of the first radiation arm and the grounding part, positioned on the same side of the first radiation arm together with the ground part and provided with at least one second gap; a plurality of gaps are arranged on the first radiation part of the multiband aerial to ensure that induction current generated by electromagnetic waves in the multiband aerial can flow through the first radiation part and can be coupled in the gaps on the first radiation part, thus a resonance structure with broadband characteristics can be formed to ensure that the resonance can work in multiband and has wider frequency band.

The invention relates to an optical system of a helmet mounted display based on a free-form surface prism. The optical system is the free-form surface prism formed by an S1 surface, an S2 surface and an S3 surface, wherein the S2 surface is a plane, and the S3 surface is a spherical surface. An overall coordinate system is firstly defined as follow: an original point O is positioned in the center of an entrance pupil; a Z axis is reversely traced from the center of the entrance pupil to the prism along a main optical axis L0; a Y axis is vertical to the Z axis and is positioned in the plane including the main optical axis L0; and an X axis is simultaneously vertical to the Y axis and the Z axis. A local coordinate system of each optical plane is then defined as follow: an original point is positioned on overall coordinates (SXi, SYi, SZi), a Zi axis passes through the original point of the local coordinate system and forms a thetai angle with the Z axis in the overall coordinate system, and a Yi axis passes through the original point and forms a right angle with the Zi axis in a symmetrical plane; and an Xi axis is vertical to coordinate axis of the Zi axis and the Yi axis, and a function expression of each optical plane is obtained according to the definition of the coordinate system, wherein a function expression of the S1 plane is a Zenike polynomial. The invention can realize the color display, effectively correct the aberration and improve the image quality.

The invention provides a base station antenna and base station radio frequency equipment. The base station antenna comprises a plurality of array antennas and a feed network connected with the array antennas, wherein the feed network comprises an input port for being connected with an external circuit, a power divider unit and a plurality of reconfigurable units, wherein an input end of the powerdivider unit is connected with the input port; the power divider unit is used for carrying out power distribution on a transmission signal to broaden a frequency band; the input ends of the reconfigurable units are connected with various output pends of the power divider unit separately; the reconfigurable units are used for carrying out phase reconfiguration on the transmission signal; and the output end of each reconfigurable unit is connected with one array antenna separately. According to the base station array antenna and the base station radio frequency equipment, power distribution is carried out on the transmission signal through a power divider, so that the impedance bandwidth is increased and broadening of the frequency band is achieved; and the transmission signal is subjected to phase reconfiguration through the reconfigurable units and then feeds the power.

The invention belongs to a far infrared composite material and particularly provides an environment-friendly inorganic wide-wave far infrared composite material. An existing far infrared material has the shortcomings of single material, narrow far infrared wave band and large function limitation, and some composite materials are not reasonable in composition and contain components harmful to the human body. The environment-friendly inorganic wide-wave far infrared composite material is prepared from, by weight, 25 parts of hetian jades, 25 parts of Sishui stone needles, 25 parts of magnets and 25 parts of tourmaline. A preparation method comprises the steps that the raw materials are respectively smashed to reach 6000 mesh, mixing is performed, and a proper amount of water is added for even stirring; press forming is performed; normal temperature air-drying is performed; calcination is performed at the high temperature of 1000 DEG C for 24 hours; normal temperature cooling is performed. Shapes formed through pressing include a powdery shape, a granulated shape, a sheet shape and a cylindrical shape. The environment-friendly inorganic wide-wave far infrared composite material has the advantages that all the selected materials are traditional Chinese medicinal materials and are toxic, a far infrared wave band is wide, multiple functions are achieved, and application is wide; wide-wave far infrared rays can be transmitted persistently, long-term benefit is obtained through one-shot usage, and the usage cost is low.

The invention discloses an infrared double frequency sulfur-system devitroceram and preparing method, which is characterized by the following: It is prepared by the raw material of GeS2, Ga2S3 and CdS (GeS250-90%, Ga2S35-25% and CdS 5-25% in mole percent); The total content of raw material is 100 moles. The preparing method comprises the following steps: preparing sulfur-system glass; making heat treatment with the temperature higher than glass transformation temperature and lower than glass crystallization temperature; keep the course of germination and crystallization; sepearating out the a good deal of one-size and sub-micron weighting infrared double frequency crystal; preparing the sulfur-system devitroceram with infrared transmitting and double frequency function. The infrared double frequency sulfur-system devitroceram has wide penetrant window (0.45-12 mum). The invention simplifies the craft, which reduces the production circle.

The invention relates to an infrared non-linear optical material Ba3AGa5Se10Cl2 and a preparation method thereof. The infrared non-linear optical material Ba3AGa5Se10Cl2 is synthesized by a high-temperature solid phase synthesis method by reacting at the temperature of 850 DEG C for 100 hours. In the invention, a novel infrared non-linear optical crystal Ba3AGa5Se10Cl2 (A=Cs, Rb and K) belongs to a tetragonal system space group; Ba3CsGa5Se10Cl2 has high non-linear performance; during primary measurement, the particle size of the material of 2.05 micrometers is between 46 and 74 micrometers, and the non-linear coefficient of the material is 13.6 times that of a commercial material AgGaS2; and the material can have potential non-linear optical application value.

The invention relates to a rapid detection system and a detection method for micro-plastics in offshore sediments based on a spatial heterodyne Raman spectrum technology. A visual light source of thedetection system is assisted by a microscopic unit and a fluorescence imaging unit, so that the detection process of the micro-plastics is more visual; through the combined application of the fluorescence imaging unit and the Raman detection system, the Raman detection system can quickly find an interested area through the auxiliary effect of the three-dimensional displacement table, so that a micro-plastic fluorescence signal is automatically recognized, and the detection efficiency is greatly improved; meanwhile, a Raman spectrum technology is coupled with a standard optical microscope, so that an acquired Raman signal returns to the spatial heterodyne Raman spectrometer through a microscopic unit, and Raman spectra with high flux, broadband and high resolution are obtained at the same time; a tunable laser is used for carrying out secondary acquisition on a signal of a target sample point, and a pure Raman spectrum signal is obtained through differential calculation and a multi-constraint iterative algorithm.

The invention discloses a high-performance Fe-Ni alloy / C composite nanofiber microwave absorbent and a preparation method thereof. The absorbent is prepared by electrostatic spinning and a post heat treatment one-step method; a synthetic technology is simple; the mean diameters of obtained fibers are 200-400nm; generated Fe-Ni alloy nanoparticles are relatively uniformly distributed in or on the surfaces of the carbon nanofibers, and are wrapped by a graphitized carbon layer; and the absorbent has better oxidation resistance and corrosion resistance. The density of a wave absorption coating prepared by compositing with silica gel is only 0.8-1.0g / cm<3> when the content of the absorbent is 3-10wt%; when the thickness of the coating is 1.2-2.0mm, the minimum reflection loss of the absorbent reaches -40dB to -95dB; the effective absorption band width with the reflection loss less than -10dB at 2-18GHz reaches 10.2GHz;a whole Ku wave band and an X wave band are covered; and the absorbent has the advantages of light mass, broadband, strong absorption, convenient adjustment of electromagnetic parameters, and the like.

The invention discloses a super surface quarter wave plate based on surface plasmon polariton. The wave plate comprises a rectangular base and a silver film which is arranged on the rectangular base. The silver film is composed of multiple periodic aperture units which are arranged in matrixes. Each aperture unit is provided with two transverse apertures which are centrally symmetrical in a vertical direction and two longitudinal apertures which are centrally symmetrical in a left-and-right direction. The extension line of the internal side of the transverse apertures has no intersection point with the longitudinal apertures. The extension line of the internal side of the longitudinal apertures has no intersection point with the transverse apertures. The super surface quarter wave plate based on the surface plasmon polariton has advantages of being simple in structure, easy to integrate, low in thickness and low in processing difficulty so that the super surface quarter wave plate based on the surface plasmon polariton has great application value in an optical sensing system, an advanced nano-photonic device and an integrated optical system.

The invention discloses a high-performance magnetic carbon-based composite nanofiber microwave absorbent and a preparation method thereof. Composite nanofibers are prepared by electrostatic spinning and a post heat treatment one-step method; a synthetic technology is simple; the mean diameters of the obtained fibers are 100-300nm; generated Ni nanoparticles are relatively uniformly distributed in or on the surfaces of the carbon nanofibers, and are wrapped by a graphitized carbon layer; and the absorbent has better oxidation resistance and corrosion resistance. The density of a wave absorption coating prepared by compositing with silica gel is only 0.8-1.0g / cm<3> when the content of the absorbent is 3-10wt%; when the thickness of the coating is 1.2-2.0mm, the minimum reflection loss of the absorbent reaches -36dB to -71dB; the effective absorption band width with the reflection loss less than -10dB at 2-18GHz reaches 9.7GHz; a whole Ku wave band and 5% of X wave band are covered; and the absorbent has the advantages of light mass, broadband, strong absorption, convenient adjustment of electromagnetic parameters, and the like.

The invention provides a multi-layer radar absorbing coating and a preparation method thereof. The absorbing coating includes alternately superimposed dielectric loss composite coating layers and magnetic loss composite coating layers; the dielectric loss coating mainly includes four needle-shaped zinc oxide Whiskers, conductive carbon black; magnetic loss composite coating mainly includes ferric oxide and nano-iron powder; it is applied to the aluminum flat material by spraying or brushing, and the spraying sequence from the bottom layer to the surface layer is: magnetic layer - dielectric Layer - magnetic layer - dielectric layer..., the coating is cured at room temperature to obtain an absorbing coating. The total thickness of the coating is 1.5±0.1mm, and the thickness of each layer is evenly distributed. The reflectivity of the radar wave absorbing stealth coating of the present invention reaches -4~-6dB in the 4-8GHz band; the reflectivity in the 8-18GHz band reaches -5~-8dB. The surface density of the coating is about 1.6±0.2kg / m2, the adhesion reaches more than 13.5MPa, the impact strength reaches 50kg.cm, and it has good temperature resistance and environmental stability.

The invention discloses rare earth doped oxyfluoride tellurite scintillation glass and a preparation method thereof. The scintillation glass and the preparation method have the following advantages: the raw materials of the scintillation glass, such as TeO2, PbF2, BaF2 and Gd2O3, are all high-density compounds, so the obtained oxyfluoride tellurite glass has density higher than 6g / cm<3>; compared with the traditional scintillation glass containing such raw materials as PbO and Bi2O3, the scintillation glass containing the above raw materials has higher short wavelength blue and violet light transmittance, so self-absorption of the scintillation glass is avoided and visible light can transmit the glass even the wave band is wider; and the scintillation glass contains Gd2O3, and luminescence of sensitized Tb3<+>, Ce3<+> and other rare earth ions greatly improves flare light output. Therefore, the scintillation glass has the advantages of high density, strong flare light luminescence output, wider wave band and good short wavelength transmittance; and the preparation method of the scintillation glass is simple and is lower in production cost.

The invention discloses a laser fluorescent induction technology-based real-time in-situ detection device for soil pollution. The detection device comprises a drilling head, a laser emission system, adetection system, a data acquisition processing system and a control system, wherein a probe is arranged on the drilling head, the laser emission system is used for emitting and transferring a pulselaser signal to the probe, a fluorescent signal is generated when a soil pollutant at the probe is simulated by laser and then is transferred to the detection system for detection, and the data acquisition processing system is used for processing detected data and outputting a result in real time, and the control system is connected with the drilling head, the laser emission system and the detection system. The detection device employs an LIF technology to research a pollution site in real time, real-time in-situ detection can be performed on an organic pollutant in soil, and three-dimensionaldirection of the pollutant in the soil is provided in real time.

The invention relates to a nanocrystalline alloy electromagnetic shielding sheet, a preparing method, a nanocrystalline alloy and a shielded antenna. The general formula of the nanocrystalline alloy is Fe100-d-e-f-g-z-mDdEeFhSifBgNizCom; the electromagnetic shielding sheet made of the nanocrystalline alloy has the high magnetic permeability and the low losses within the using frequency domain; and when the nanocrystalline alloy electromagnetic shielding sheet is used in NFC, the requirement for the electromagnetic shielding sheet is that at the corresponding frequency, the magnetic permeability of the electromagnetic shielding sheet is within a certain scope, and the losses are low.

The invention discloses a high-performance and high-frequency responsivity ferrite-based composite having a laminated structure, which is formed by superposing an underlying material, a top layer material and a sandwich material in sequence, wherein the underlying material is a layer of black or sub-black non-transparent double-sided pressure-sensitive adhesive; the top layer material is a layer of black or sub-black single-sided glue; and the interlayer material is a magnetic material laminated structure which is formed by alternately laminating any two or three kinds of soft magnetic materials such as ferrite, nanocrystal and amorphous. Compared with the conventional ferrite, nanocrystalline and amorphous soft magnetic materials, the ferrite-based composite having the laminated structureprovided by the invention has the advantages of high magnetic saturation strength, wide frequency band and high-sensitive frequency response, high magnetic permeability, low magnetic loss and the like. The ferrite-based composite in the invention is applicable to a next generation of wireless charging transmitting end and receiving end and is particularly suitable for a non-contact resonant A4WPwireless charging scheme.

The invention relates to a noise suppression sheet and relates to a noise suppression sheet made from a compound material of NiZn ferrite and FeSiAl. The noise suppression sheet is synthesized by mixing the NiZn ferrite and the FeSiAl, wherein the mixing proportion of the NiZn ferrite to the FeSiAl is 1 to 4-1 to 5. By utilizing the noise suppression sheet, the frequency band of the noise suppression sheet for suppressing the noise can be wide.

The invention relates to a liquid crystal metamaterial-based two-dimensional luneberg lens antenna, and aims at solving the technical problems that the lens antenna is great in loss, low in efficiency and small in bandwidth. According to the technical scheme, the two-dimensional luneberg lens antenna comprises a luneberg lens and an antenna feed source arranged on the surface of the luneberg lens along the axial direction, wherein the luneberg lens comprises at least one circle area; each circle area comprises a plurality of liquid crystal metamaterial units; each liquid crystal metamaterial unit comprises a first dielectric layer, one liquid crystal alignment layer, a liquid crystal cavity, another liquid crystal alignment layer and a second dielectric layer which horizontally overlap and are sequentially arranged; a luneberg lens structure patch is arranged on the surface of each first dielectric layer; and each liquid crystal cavity is used for being filled with a liquid crystal metamaterial, so that the problems are relatively well solved, and the liquid crystal metamaterial-based two-dimensional luneberg lens antenna can be applied to a microwave antenna.

The invention provides a broadband high spectral resolution imaging system for foundation-to-moon observation, and relates to the technical field of imaging spectrum and radiometric calibration, and can solve the problem that a foundation-to-moon observation system employing an existing optical filter type spectrum imager is narrow in wave band, less in number of spectra sections, discontinuous in spectral observation and low in the spectral resolution. The system comprises a primary mirror, a secondary mirror, an incident slit, a wedge form color separation film, a first VNIR reflector, a VNIR convex raster, a second VNIR reflector, a VNIR plane turnover mirror, a VNIR level selection optical filter, a VNIR focal plane detector, a first IR reflector, an IR convex raster, a second IR reflector, an IR level selection optical filter and an IR focal plane detector. The broadband high spectral resolution imaging system for foundation-to-moon observation utilizes the moon-to-earth motion to adjust the angle of a rotary table to realize broadband and high resolution scanning observation of the whole moon disc. The broadband high spectral resolution imaging system for foundation-to-moon observation utilizes the wedge form color separation film to realize simultaneous detection of the visible near-infrared wave band and infrared wave band, and has the advantages of being wide in wave band, increasing the number of spectra sections, being continuous in spectral observation, and being high in spectral resolution and spectral purity.

The invention relates to a K3YB6O12 compound, a K3YB6O12 single crystal and preparation methods and applications of the K3YB6O12 compound and the K3YB6O12 single crystal. The K3YB6O12 compound is prepared by chemical synthesis, and the K3YB6O12 single crystal grows by melting salt with a fluxing agent, wherein the fluxing agent is a K2O-B2O3-KBF4 fluxing agent. The K3YB6O12 single crystal has no center of symmetry, belongs to a trigonal system and has an R32 space group, and the cell parameters comprise a=13.2202(19)Angstrom, c=30.281(6)Angstrom, v=4583.3(13)Angstrom<3>, and Z=15. The K3YB6O12 single crystal can be used for preparing a nonlinear optical element, has high purity, low cost, strong nonlinear optical effect, good mechanical performance and wide transmission range, is not easy to be doped with impurities, is non-deliquescent, is easy to process and preserve and has an ultraviolet interception edge of 195nm.