307 results about "Wave transmission" patented technology

The invention relates to the technical field of power systems, and discloses a power distribution network fault positioning method, device and equipment and a medium, and the method comprises the steps: synchronously collecting fault traveling wave data through a transformer area intelligent terminal and a feeder terminal disposed in a power distribution network; dynamically calculating traveling wave transmission parameters based on the topological information and the real-time operation parameters of the power distribution network; performing feature extraction and fusion processing on fault traveling wave data acquired by the transformer area intelligent terminal and the feeder terminal to generate a joint feature matrix; based on the joint feature matrix and the traveling wave transmission parameters, cooperative verification is carried out through the single-end positioning information and the double-end positioning information, and a fault section is determined; and performing fault type identification on the fault section by using the intelligent classification model, and performing consistency verification according to an obtained fault type identification result and the fault section to generate a fault diagnosis result. According to the invention, accurate positioning of the power distribution network fault can be realized, and the problems of positioning blind areas, high cost and easy misjudgment in the prior art are solved.

The invention discloses an ultra-wideband RCS (radar cross section) reduction metasurface with mixed wave absorption and diffuse scattering and a wave-transparent window, and belongs to the technical field of electromagnetic metamaterials. The metasurface adopts a four-layer cascade structure and comprises a first layer of polarization conversion structure, a second layer of 2.5 D lossy structure, a third layer of Jerusalem cross-shaped lossy structure and a fourth layer of frequency selective surface structure. By loading a lumped resistor at a specific position and adopting a metal through hole interconnection technology, dual functions of radar cross section reduction in a 1-20GHz ultra-wideband and low insertion loss wave transmission in a 8-12GHz frequency band are realized. The structure of each layer adopts a highly symmetrical design and has the characteristic of polarization insensitivity, and meanwhile, by optimizing interlayer air gaps and dielectric material selection, the structure compactness is realized on the premise of ensuring the performance. The method has important application value in the aspect of integration of stealth equipment and a communication system.

An apparatus is provided which comprises at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receive a carrier wave transmission modulated by an ambient internet of things device in an ambient internet of things session, determine whether a received power of the carrier wave transmission is below a predetermined threshold; and in response to determination that the received power is below the predetermined threshold, prepare a notification requesting to control at least one carrier wave transmission characteristic such that the received power is increased, and transmit the notification to a carrier wave provider transmitting the carrier wave transmission or to a session control unit controlling the ambient internet of things session.

The invention provides a CEEMDAN-SSA-based power distribution network fault identification method, and the method comprises the steps: receiving a traveling wave signal of a power distribution network, and carrying out the preprocessing of the traveling wave signal; decomposing the preprocessed traveling wave signal by adopting CEEMDAN to obtain an intrinsic mode function component set, and selecting a high-frequency intrinsic mode function component from the intrinsic mode function component set; performing noise reduction on the high-frequency intrinsic mode function component by using singular spectrum analysis to obtain a pure fault feature signal; analyzing and reconstructing the frequency spectrum characteristics of the pure fault characteristic signal by using fast Fourier transform, and calculating the average frequency spectrum content of the low-frequency-band signal and the amplitude ratio of the high-frequency-band signal according to the frequency spectrum characteristics; and generating a fault identification result of the power distribution network by taking the average frequency spectrum content of the low-frequency-band signal as a main criterion and taking the amplitude proportion of the high-frequency-band signal as an auxiliary criterion according to the fault traveling wave transmission characteristics. Therefore, high-precision power distribution network fault identification can be realized in a complex working condition and a high-noise environment.

A frequency selective unit, a frequency selective surface, and an antenna base station. The frequency selective unit comprises a metal reflector plate and at least two conductive material pattern layers, wherein through holes are provided in the metal reflector plate, the at least two conductive material pattern layers run through the through holes, and there is a gap between the conductive material pattern layers and the metal reflector plate; and at least one conductive material pattern layer comprises a first transmission mode, and at least the other conductive material pattern layer comprises a second transmission mode, and in a transition band, electromagnetic waves in the two transmission modes have opposite phases and cancel each other, such that the electromagnetic waves cannot be transmitted through the frequency selective unit; moreover, an electromagnetic wave transmission zero can be generated in the transition band, and a sharp roll-off is formed at an out-of-band edge of a second band, thereby realizing high-frequency selectivity. The conductive material pattern layers are not parallel to the metal reflector plate, the transmission direction of the electromagnetic waves is parallel to the surfaces of the conductive material pattern layers, and it is not necessary to provide a metallized via hole between the at least two conductive material pattern layers to perform electrical connection, thereby simplifying the manufacturing process and processing difficulty of the frequency selective unit.

The invention discloses a micro-through-hole structure polymer metallization method for guided wave transmission, and belongs to the technical field of photoelectric device processing, a polymer substrate is used for replacing a traditional all-metal material, and the micro-through-hole structure polymer metallization method for guided wave transmission is achieved through the multi-stage processes of plasma activation, chemical coarsening, sensitization, chemical plating, electroplating and the like. And forming a compact and high-adhesion metal layer on the inner surface of the through hole of the polymer substrate. In the process, a microfluid pump or a peristaltic pump is adopted to drive the solution to circularly flow in the through hole and the microcavity. According to the micro-through-hole structure polymer metallization method for guided wave transmission, dynamic flowing of a chemical plating solution in a micro-through hole and an internal cavity is achieved by introducing a micro-fluid pump or a peristaltic pump, and therefore a uniform, compact and firmly-attached metal layer is obtained.

The invention provides a plasma transient time boundary-based terahertz wave spectrum regulation and control method and device, and the method comprises the steps: obtaining femtosecond laser and terahertz waves, and enabling the femtosecond laser and the terahertz waves to enter a terahertz wave transmission space through beam combination; when the femtosecond laser and the terahertz wave synchronously pass through a first position point, the terahertz wave after frequency spectrum regulation and control is obtained; the first position point is located in the terahertz wave transmission space, a time boundary caused by medium transient refractive index sudden change is formed at the first position point when the femtosecond laser ionizes gas to obtain plasma, and frequency shift occurs when terahertz waves pass through the time boundary. According to the invention, the modulation effect on the terahertz wave frequency demand can be realized according to the abrupt change of the refractive index caused by the transient generation of the plasma.

The embodiment of the invention provides a multi-physical field collaborative simulation method and device for a high-speed silicon-based electro-optical modulator, and the method comprises the steps: building a physical model of the electro-optical modulator, carrying out the simulation under different bias voltage and temperature conditions, solving a Poisson equation, a carrier continuity equation and a drift diffusion transport equation, and obtaining the corresponding carrier concentration distribution; performing small-signal simulation analysis on the model to obtain corresponding PN junction electrical characteristic parameters; performing waveguide optical mode simulation on the model to obtain corresponding electric field mode distribution and effective refractive index, and calculating the effective refractive index and absorption coefficient change of the waveguide; constructing a traveling wave electrode model, simulating the traveling wave electrode model to solve an S parameter of a traveling wave electrode, and determining a distribution parameter of the no-load traveling wave microstrip line; a load traveling wave transmission line model is constructed in combination with PN junction electrical characteristic parameters, and based on the model, the frequency response characteristics and the modulation bandwidth of the electro-optical modulator at different temperatures are determined, so that the accuracy of a simulation result can be improved.

The invention provides a permeable breakwater and a design method thereof, and relates to the technical field of permeable breakwater. Aiming at the lack of a design method for high-precision environment coupling and high-accuracy structure stress prediction during design of a permeable breakwater in the prior art, the method comprises the following steps: establishing a wave-structure-foundation coupling model based on structure stress data, environment soil characteristics and a transmission coefficient of waves; s5, selecting a wave-structure-foundation coupling model, simulating different structure parameter combinations based on the wave-structure-foundation coupling model, and when the simulation results do not meet the target requirements, circularly executing the steps S2 to S5 until the simulation results meeting the target requirements are screened out, and determining a corresponding final structure parameter combination. The cooperative working mechanism of the reduction foundation and the pile foundation is realized, the dynamic interaction of the wave load and the structural response is simulated, and the environmental coupling precision and the structural stress prediction accuracy are improved.

The invention discloses a frequency selection absorber design method based on cross-layer electromagnetic function decoupling mapping and cross-layer coupling electromagnetic network abstraction, which comprises the following steps: decoupling and mapping wave absorbing and wave transmitting function requirements to a set space region of a double-layer structure through cross-layer electromagnetic function decoupling mapping, forming a physical structure comprising an edge loss region, a central resonance region, a middle coupling region and a system wave-transparent resonance region; abstracting the physical structure into a unified model comprising a composite RLC integrated network, a band-pass resonance network and a coupling network through cross-layer coupling electromagnetic network abstraction; carrying out collaborative optimization on model parameters of the unified model so as to realize path collaborative control of electromagnetic energy of the frequency selection absorber under frequency band selection; and meanwhile, the ultra-thinness and robustness of the structure are realized. According to the invention, an integrated design normal form for solving functional contradictions in principle is adopted, and the inherent contradiction between broadband wave absorption and extremely low loss wave transmission is solved.

The invention discloses a temperature monitoring system suitable for a fusion reactor low-clutter system and an over-temperature protection method. The temperature monitoring system comprises a high-speed temperature acquisition unit, a thermocouple sensor, an industrial control upper computer and a database server. A microwave excitation signal of the microwave excitation source is amplified by the microwave source klystron and then transmitted to the low-clutter coupled antenna through the microwave transmission line, and a plurality of temperature measuring points are arranged on the waveguide surface of the microwave transmission line and the end face of the low-clutter coupled antenna. Measurement output ends of the thermocouple sensors are uniformly accessed and gathered into the high-speed temperature acquisition unit and are uploaded to the industrial control upper computer, and the industrial control upper computer records and stores acquired multi-channel real-time temperature data, control signal output values and alarm events into the database server. The method has the advantages that early warning and temperature regulation are carried out for potential thermal runaway faults, so that the equipment safety of a high-power microwave transmission device and the normal operation of a low-clutter current driving system are guaranteed.

The invention provides a high-temperature-resistant low-dielectric-loss cyanate ester-based composite material and application thereof to a radar-resistant high-power-density antenna housing, and meets the requirement of continuously improving the transmission power of antenna signals on the power-resistant performance of the antenna housing. The high-temperature-resistant low-dielectric-loss cyanate ester-based composite material disclosed by the invention is composed of a prepreg plate, a glue film and a honeycomb, matrix resins of the prepreg plate, the adhesive film and the honeycomb are all modified cyanate ester-based resins; the modified cyanate ester-based resin is prepared by blending and modifying benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin and cyanate ester resin. The cyanate ester-based composite material with high temperature resistance and low dielectric loss has the advantages of high wave transmission rate, low reflectivity, low thermal conversion efficiency, high heat dissipation efficiency and excellent heat resistance.

The application provides a traveling wave distance measurement method and device based on modal decomposition and transient energy spectrum, equipment, and a medium. The method comprises the following steps: performing variational modal decomposition on transient traveling wave signals of two substations to obtain a function set composed of multiple intrinsic modal functions; determining modal components from the two function sets based on a kurtosis energy joint criterion; determining transient energy sequences based on the modal components and multiple Teager energy operators; determining the arrival time of the wave head from the transient energy sequences based on an adaptive dynamic threshold method; and determining the fault point position based on the arrival time of the wave head, a preset line length, and a target traveling wave transmission speed. The kurtosis and energy can be used to capture the mutation point of the wave head at the signal level, the arrival time of the wave head can be determined based on the physical characteristics of the signal, noise can be suppressed by combining the modal components and the Teager energy operator, and efficient calculation and anti-interference can be realized without introducing a neural network model.

An acoustic manipulation device is disclosed for acoustic treatment of a fluid volume. The acoustic manipulation device comprises a transducer and a superstrate. The transducer comprises a transducer piezoelectric material and transducer electrodes configured to apply an electric field to the transducer piezoelectric material, the transducer having a transducer acoustic wave transmission surface and the transducer being operable to generate and propagate acoustic waves to the transducer acoustic wave transmission surface. The superstrate has a superstrate acoustic wave transmission surface detachably coupled to the transducer acoustic wave transmission surface. The superstrate further has or is coupled to a fluid volume acoustic wave transmission surface, the fluid volume acoustic wave transmission surface being configured to receive a fluid volume for interaction with acoustic waves generated by the transducer and transmitted to the fluid volume via the superstrate. The superstrate comprises a superstrate piezoelectric material.

The invention discloses an energy selection surface with a polarization conversion function, which is formed by periodically arranging a plurality of energy selection surface units with the same structure, each unit comprises a polarization conversion layer and an energy selection layer, and the polarization conversion layer is composed of two metal layers and three dielectric plate layers so as to realize the polarization conversion function; the energy selection layer is composed of two metal layers, two dielectric plate layers and an air layer so as to realize an energy selection function; the polarization conversion layer and the energy selection layer are separated by an air layer. According to the energy selection surface, through the combined action of the polarization conversion layer and the energy selection layer, the insertion loss of the energy selection surface can be lower than-1dB in a wave transmission mode in a working frequency band, and the polarization conversion efficiency exceeds 90%. In a protection mode, the energy selection surface shows a remarkable energy selection characteristic in an ultra-wideband range, the protection efficiency is superior to-20dB, and the energy selection surface is suitable for an aircraft antenna housing.

The embodiment of the invention relates to the technical field of millimeter wave antennas, and discloses a millimeter wave antenna and a radar system.The millimeter wave antenna comprises a waveguide structure, a metallization layer, an isolation structure and a welding structure, and the waveguide structure comprises a first waveguide assembly and a second waveguide assembly; the first waveguide assembly and the second waveguide assembly are oppositely arranged to form a combination surface, the combination surface is provided with a functional area and a welding area, the functional area forms a millimeter wave transmission channel, the metalized layer covers the waveguide structure, the isolation structure is arranged between the welding area and the functional area, and the metalized layer covers the isolation structure. The isolation structure is used for preventing the soldering tin from diffusing from the soldering area to the functional area, in this way, effective separation of the soldering function and the waveguide performance function can be achieved, the isolation structure can effectively prevent the soldering tin from diffusing to the functional area, and it is ensured that the geometric dimension and the internal state of the millimeter wave transmission channel are kept stable; and the consistency of the electromagnetic performance of the antenna core is maintained.

The application relates to a method, a system, a device and a storage medium for transmitting high-frequency signals based on millimeter wave transmission, and belongs to the technical field of data transmission. The method comprises the following steps: converting, by a wireless signal conversion IC of a wireless device, a first USB-Thunderbolt signal to be transmitted into a first millimeter wave transmission signal, transmitting the first millimeter wave transmission signal in a wireless mode, and transmitting the first USB-Thunderbolt signal to a USB-Thunderbolt chip; receiving and resetting, by a millimeter wave signal conversion chip, the first millimeter wave transmission signal into the first USB-Thunderbolt signal, transmitting the first USB-Thunderbolt signal to the USB-Thunderbolt chip, and distributing the first USB-Thunderbolt signal to different interfaces according to the signal type of the first USB-Thunderbolt signal. The application has the following effects: long-distance lossless high-frequency full-load transmission of wireless signals is realized, the signals are converted into millimeter waves for transmission, the transmission efficiency and length between devices are improved by taking advantage of the transmission advantages of millimeter waves, and the application is not limited by wires and is more flexible to use.

The preparation method of the narrow-band optical filter comprises the following steps: S1, cleaning the surface of a glass substrate; s2, putting the treated glass substrate into a tool clamp, and hanging the tool clamp into a cavity of a vacuum coating machine; s3, vacuumizing is carried out, the vacuum degree reaches 1.0 * 10 <-3 > Pa, and radio frequency ion source cleaning is carried out; s4, plating the first surface with a short-wave-pass film system; s5, after the first surface is plated with the short-wave pass film system, taking out the tool clamp and the glass substrate plated with the first surface after the cavity is cooled to 50-60 DEG C or below; s6, repeating the steps S1 to S3; s7, plating an antireflection film system on the second surface; and S8, after plating of the antireflection film system on the second surface is completed, the tool clamp and the glass substrate are taken out after the cavity is cooled to 50-60 DEG C or below. The transmittance of the prepared glass substrate together with the short-wave pass film system on the first surface and the antireflection film system on the second surface at a 0-degree test angle in a 530 + / -20 nm wave band (namely a narrow band) is more than 99.5% on average, and the transmittance cut off in 400-500 nm and 560-700 nm wave bands on the two sides of the narrow band is less than 0.3% on average.

The invention discloses an infusion medicine category identification method, system and device and a storage medium, and the method comprises the steps: carrying out the frequency mixing of a millimeter wave transmission signal and a reflection signal, obtaining an intermediate frequency signal, determining a first data pair sequence through fast Fourier transform based on the intermediate frequency signal, and obtaining a first data pair sequence; performing abnormal data deletion on the first data pair sequences of all the windows through an Euclidean distance function, and inputting the second data pair sequences into the trained generator to obtain a first feature vector output by the trained generator; and inputting the first feature vector into a trained classifier to obtain a category identification result of the to-be-identified infusion medicine output by the trained classifier, thereby realizing lossless identification, and improving the efficiency and accuracy of infusion medicine category identification.

The application provides a low-frequency antenna, an antenna array and an electronic device. The low-frequency antenna comprises a dielectric substrate and a plurality of radiation units arranged on the dielectric substrate. Each radiation unit comprises a ring-shaped radiation element and a frequency selective surface arranged in the ring-shaped radiation element, and the frequency selective surface and the ring-shaped radiation element are insulated from each other. Each ring-shaped radiation element is provided with a gap. The low-frequency antenna provided by the application has a relatively wide wave transmission characteristic, and can realize relatively independent regulation and control.

The application discloses a broadband low radar scattering cross section antenna loaded with an ATFSS, which comprises three layers of dielectric plates, namely, an upper layer plate, a middle layer plate and a lower layer plate, the upper surface and the lower surface of the upper layer plate are attached with wave absorbing structures, the lower surface of the middle layer plate is attached with a band-pass FSS structure, the upper surface of the lower layer plate is attached with a patch antenna, the lower surface of the lower layer plate is a metal ground plate, coaxial line feeding is adopted, and the upper layer plate, the middle layer plate and the lower layer plate are all air cavities. The broadband low radar scattering cross section antenna adopts the wave absorbing structure with a multi-resonance structure and the band-pass FSS structure, can realize the integrated characteristics of wave absorption and wave transmission, and the wave absorbing structure and the band-pass FSS can be loaded as a coating above the microstrip patch antenna to realize the RCS reduction in a wide frequency band under the condition of ensuring the normal radiation of the antenna.

When the human society enters the highly informationized era, instant uninterrupted communication between electronic devices is everywhere, which causes innovative application of the 5G / 6G communication technology in work and life, such as automobile automatic driving, virtual / augmented reality, digital logistics and the like. The development of the technologies also continuously improves the performance requirements of the low-dielectric composite material, such as high frequency, high speed and low loss, which are the key points of the current research. The invention provides preparation of a polytetrafluoroethylene-based quartz fiber low-dielectric composite material, quartz fibers and polytetrafluoroethylene resin are used as a reinforcement and a matrix, the resin content of a composite material substrate is regulated and controlled by adopting a multi-impregnation mode, and surface defects of the composite substrate are repaired through polydopamine deposition. The polytetrafluoroethylene-based quartz fiber low-dielectric composite material prepared by the invention is high in strength, has low dielectric constant and dielectric loss in a high-frequency environment, is simple in preparation process, and can meet wave-transparent performance requirements and packaging requirements of a new generation of communication technology and related equipment.

The invention relates to the technical field of industrial nondestructive testing and automatic measurement, in particular to a non-contact liquid level detection device and method based on millimeter wave transmission imaging. According to the technical scheme, the system comprises a gantry type scanning rack, an objective table, a millimeter wave transmitting and receiving assembly and a data acquisition and processing module. Two-dimensional grating type scanning is achieved by synchronously driving the X-axis sliding block and the Z-axis sliding block, a focused millimeter wave beam is emitted to penetrate through the container, and a signal is received and converted into voltage data. A two-dimensional transmission image is generated based on the voltage attenuation difference, the liquid level edge is recognized through image processing, and the liquid level height is automatically calculated. The method has the advantages of no contact, no damage, visualization, high precision, strong environmental adaptability and the like, and is suitable for automatic detection of liquid in flammable and explosive or non-transparent containers.

The invention discloses a nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter and a control method, and belongs to the field of terahertz devices. The nonlinear quasi bound state terahertz non-magnetic regulation non-reciprocal transmitter is formed by periodically arranging and splicing a plurality of unit structures, and each unit structure comprises a silicon carbide substrate and a cylindrical groove gallium arsenide cylinder with the same outer diameter and different inner diameters. The non-linearity of the gallium arsenide material is combined with the asymmetry of the gallium arsenide cylindrical unit structures of the cylindrical grooves with the same outer diameter and different inner diameters, and the non-reciprocal transmission intensity of the terahertz waves is adjusted by changing structural parameters, so that the non-reciprocal transmission regulation and control of the terahertz waves are realized. The nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device designed by the invention is simple in structure, terahertz wave transmission can be regulated only by changing the incident power of terahertz waves without additionally arranging bias mechanisms such as an external magnetic field, electricity, light, a heat source and the like, and the nonlinear quasi-bound-state terahertz non-magnetic regulation non-reciprocal transmission device is suitable for a future terahertz integrated system.

The application discloses a kind of wideband sandwich radome based on double-band super surface, it includes sequentially arranged first impedance matching layer, radome frequency selective surface layer, second impedance matching layer, the radome frequency selective surface layer includes several periodic frequency selective surface units, radome frequency selective surface layer is formed by multilayer metal structure and dielectric substrate A space filter, so that corresponding wideband sandwich radome has wave band selectivity;When electromagnetic wave irradiates to the surface of wideband sandwich radome based on double-band super surface, two transmission poles are generated in low frequency band to form second-order band-pass filter response, and three transmission poles are generated in high frequency band to form third-order band-pass filter response.The advantages are: the wideband sandwich radome has the excellent characteristics of double-band wideband wave transmission, large-angle stability, out-of-band steep cutoff, adjustable frequency ratio of wave transmission band center frequency, polarization insensitivity and the like by the above structure, and the overall structure is simple and easy to process.

The present application relates to the technical field of slurry concentration detection, and particularly relates to a mine filling slurry concentration detection method, device and system. According to the time domain distribution of the frequency domain amplitude of each frequency in the spectrum diagram in the ultrasonic echo signal, the particle size of each frequency domain amplitude and whether the dominant frequency needs to be adjusted are obtained. If it is judged that the dominant frequency needs to be adjusted, the new dominant frequency of each frequency domain amplitude is obtained according to the dominant frequency and the particle size mismatch of the sound wave. According to the particle and the sound wave mismatch of each frequency domain amplitude, and the ultrasonic wave transmission distance, the new ultrasonic wave transmission distance of each frequency domain amplitude is obtained. The new ultrasonic echo signal is obtained. Until it is judged that the dominant frequency of each frequency domain amplitude does not need to be adjusted, the optimal dominant frequency of each frequency domain amplitude is obtained. The concentration of the filling slurry is detected. The present application improves the accuracy of the filling slurry concentration detection by analyzing the effective dominant frequency corresponding to the particle size corresponding to each frequency amplitude.

The invention discloses wave-transparent flame-retardant resin for a millimeter wave radome and a preparation method of the resin, and relates to a resin material with excellent wave-transparent performance and flame-retardant performance and a preparation method of the resin material. The resin is composed of fluorine-containing polyfunctional glycidyl amine type epoxy resin and a porous hollow fluorine-containing polyimide low-dielectric microsphere filler. The resin realizes low dielectric constant and low dielectric loss tangent value through specific molecular structure design and introduction of the functional filler, so that the wave-transparent performance is improved. Meanwhile, nitrogen and fluorine elements are introduced into the molecular structure, so that the resin shows a good intrinsic flame-retardant effect. The preparation method comprises the following steps: synthesizing the fluorine-containing polyfunctional glycidyl amine type epoxy resin and the porous hollow fluorine-containing polyimide low-dielectric microsphere filler, and then blending the fluorine-containing polyfunctional glycidyl amine type epoxy resin and the porous hollow fluorine-containing polyimide low-dielectric microsphere filler to obtain the wave-transparent flame-retardant resin for the millimeter wave radome. Compared with the prior art, the resin disclosed by the invention has the characteristics of keeping a low dielectric constant and a low dielectric loss tangent value at high temperature, the wave-transparent performance at high temperature is improved, and meanwhile, nitrogen and fluorine elements in a molecular structure provide an excellent intrinsic flame-retardant effect. The millimeter wave radome prepared from the resin disclosed by the invention has the advantages that the wave transmission performance is maintained, the flame retardant property is obviously improved, and the millimeter wave radome is suitable for advanced driving assistance systems (ADAS) and other millimeter wave radar application fields.

This disclosure discloses a millimeter-wave antenna device and a millimeter-wave antenna base station, belonging to the field of antenna technology. The millimeter-wave antenna device includes a transmitting module, a receiving module, an radome with wave transmission characteristics, and a base with electromagnetic wave shielding characteristics. The radome is fixedly connected to the base to form a cavity, and the transceiver modules are located inside the cavity and spaced apart on the base. An absorbing material layer is provided on the side of the radome facing the base, and the projection of the absorbing material layer onto the base lies between the transceiver modules. The absorbing material layer comprises the following components in parts by weight: 10-60 parts thermoplastic resin, 40-85 parts absorbing powder, and 2-15 parts toughening agent, wherein the absorbing powder includes carbonyl iron powder, and the particle size D50 of the carbonyl iron powder is 1μm-6μm. The absorbing material layer has strong normal and wide-angle absorption efficacy for millimeter waves in the 24.25GHz-29.5GHz frequency band, effectively reducing millimeter wave reflection interference from the base and improving signal isolation between the transceiver modules.

The invention relates to the technical field of terahertz detection, in particular to a signal measurement method for a terahertz wave transmission system. According to the technical scheme, the method comprises the following steps that a terahertz source is used for emitting terahertz waves, and after the terahertz waves are transmitted through one or more optical assemblies, stable transmission light beams are formed; an image of the transmission light beam is collected through a terahertz detector, and an original gray level image is obtained; and carrying out image processing on the original grayscale image, and extracting a light spot area. A complete two-dimensional light spot image is obtained at a time through the area array detector, an effective light spot area is automatically extracted in combination with an image processing algorithm, coordinate mapping is carried out, and efficient and stable measurement of terahertz wave energy distribution is achieved; by calculating light spot center energy and comparing energy changes under different optical assembly configurations, the transmission loss of the assembly can be quantitatively analyzed, and a reliable and quantifiable measurement means is provided for terahertz system debugging, assembly performance evaluation and multi-scene application.

The invention discloses a terahertz non-reciprocal transmission regulator with a double-quasi bound state effect and a method thereof, and belongs to the field of terahertz technologies and devices. The terahertz non-reciprocal transmission device with the double quasi bound state effect is formed by periodically arranging and splicing a plurality of unit structures, and each unit structure is composed of amorphous chalcogenide glass arsenic selenide with unequal rectangular grooves. According to the invention, the nonlinearity of the arsenic selenide material is combined with the asymmetry of the amorphous chalcogenide glass arsenic selenide unit with unequal grooves to generate a double quasi bound state effect, and the first quasi bound state effect and the second quasi bound state effect are utilized to realize the terahertz wave nonreciprocal transmission regulation and control of double frequency points at the same time. The terahertz non-reciprocal transmission device with the double quasi bound state effect designed by the invention is simple in structure, terahertz wave transmission can be regulated and controlled only by changing the incident power of terahertz waves without adding any external bias, and the research of an integratable non-reciprocal device is facilitated.