13 results about "Dielectric function" patented technology

The present disclosure relates to the technical field of communications, and provides a leaky-wave antenna and an antenna system. The leaky-wave antenna comprises: a first dielectric substrate, a first metal layer, a dielectric functional layer, a second metal layer, and a second dielectric substrate. The first metal layer comprises a first transmission line and first radiation units; multiple first notches distributed at intervals are provided on a side edge, parallel to a length direction, on a first plasmon section of the first transmission line; and the multiple first radiation units and the first notches are located on the same side of the first transmission line. In the embodiments of the present disclosure, on the basis of the first plasmon section comprised in the first transmission line, the confinement capability of electromagnetic signals can be enhanced, and the radiation of the electromagnetic signals can be reduced, thereby ensuring the transmission efficiency of the electromagnetic signals, and achieving compact design of leaky-wave antennas. In addition, by radiating antenna signals outward from the first radiation units, high gain of the antenna signals can be ensured while maintaining high transmission efficiency in the first transmission line.

The invention relates to an insulator electric field homogenization and metal particle expelling collaborative optimization method based on an MLB neural network and an NSGA-II, which optimizes the structural parameters of a laminated dielectric functional gradient insulator by constructing a neural network agent model and combining with an NSGA-II multi-target genetic algorithm. Firstly, a neural network model is trained according to sample data, and rapid mapping of input design parameters, output electric field distribution and metal particle motion characteristics is achieved; and then, carrying out global optimization search on the basis of the proxy model, comprehensively considering the targets of the electric field homogenization index and the metal particle flooding efficiency to obtain a Pareto optimal solution set, and screening out a design scheme with the optimal comprehensive performance by using a TOPSIS method. Compared with a uniform insulator, the optimized insulator can realize obvious uniformization of electric field distribution on the concave side and the convex side, and has the capability of actively expelling metal particles, so that surface flashover and particle pollution risks are effectively reduced.

The utility model discloses a composite multimode waveguide structure, which belongs to the technical field of optoelectronic devices and comprises a plasmon unit made of a metal material or a material with a negative real part dielectric function. The plasmon unit is structurally characterized by comprising nanoparticles, nanowires, nanopore arrays or gradient structures; the dielectric waveguide is made of a semiconductor material with a high refractive index, and the dielectric waveguide is designed to be one of a strip-shaped waveguide, a ridge-shaped waveguide or a slit waveguide; and the substrate layer is located below the plasmon unit and the dielectric waveguide and comprises at least one low-refractive-index supporting layer, and the material system of the low-refractive-index supporting layer is one of an oxide material, a nitride material, a fluoride material or a composite substrate structure. According to the scheme, the contradiction of a plasma device and silicon photonics among mode degree of freedom, loss and process compatibility is solved.

This application discloses a lightweight PPO / PA foam material and its preparation method, relating to the field of polymer foam material technology. The method involves constructing a foaming composition using polyphenylene ether, polyamide 6, maleic anhydride-grafted polyphenylene ether, and epoxy-based reactive additives. After mixing and molding, the foam material is obtained through supercritical carbon dioxide saturation foaming and shaping. Further introduction of flame-retardant fillers composed of bisphenol A bis(diphenyl phosphate), melamine cyanurate amide, and zinc borate, as well as SiO2 aerogel or PTFE low-dielectric fillers, can yield flame-retardant, low-dielectric, and flame-retardant low-dielectric foam materials. The beneficial effects of this application are: it can maintain flame-retardant and low-dielectric properties while maintaining low-density mechanical properties, improve foaming stability and cell structure uniformity, enhance the overall structural continuity and comprehensive level of the molded body, and achieve synergy or combination of flame-retardant and low-dielectric functions.

The invention provides a band-pass phase shifter and an antenna device, and relates to the technical field of communication. The band-pass phase shifter comprises a first dielectric substrate, a first metal layer, a dielectric function layer, a second metal layer and a second dielectric substrate, the second metal layer comprises a filtering transmission line, the filtering transmission line comprises a pair of dual composite transmission lines, each dual composite transmission line comprises an interdigital capacitor and an electric transmission line, and the interdigital capacitor is connected with the dielectric function layer. Coupling feeding is formed between the electric transmission lines included in the pair of dual composite transmission lines. In the embodiment of the invention, for the dual composite transmission lines included in the filtering transmission line, the filtering characteristic of a certain bandwidth can be realized through the coupling arrangement of a pair of dual composite transmission lines based on the band elimination characteristic of the dual composite transmission lines; meanwhile, based on the arrangement of the dielectric functional layer, the adjustment of the electromagnetic wave phase can be realized by adjusting the dielectric constant of the dielectric functional layer; therefore, while the miniaturization design of the band-pass phase shifter is realized, the phase shifting characteristic and the filtering characteristic of the band-pass phase shifter are ensured.

The invention provides an analysis method of a zinc sulfide optical window surface oxide layer, which comprises the following steps: firstly obtaining the spectrum and thickness of a window without an oxide layer to accurately calibrate the intrinsic dielectric function of a zinc sulfide substrate, then establishing an optical physical model containing the surface oxide layer, and taking the test spectrum of the optical physical model with the oxide layer as a target to accurately calibrate the intrinsic dielectric function of the zinc sulfide substrate. And the physical thickness and the dielectric function of the surface oxide layer are inverted through fitting calculation at the same time. According to the method, non-destructive, synchronous and accurate measurement of the thickness and the optical constants (the refractive index and the extinction coefficient) of the surface oxide layer of the zinc sulfide optical window is realized for the first time, and the technical problem that the surface oxide layer characteristics are difficult to quantitatively analyze in special application environments such as high temperature is effectively solved; key data support is provided for accurately evaluating the window performance, predicting the service life of the window and developing efficient anti-oxidation measures, and the reliability and application development of the zinc sulfide optical window technology are remarkably promoted.

The invention provides a leaky-wave antenna and an antenna system, and relates to the technical field of communication. The leaky-wave antenna comprises a first dielectric substrate, a first metal layer, a dielectric functional layer, a second metal layer and a second dielectric substrate, the first metal layer comprises a first transmission line and first radiation units, a plurality of first notches distributed at intervals are formed in the edge of one side, parallel to the length direction, of a first plasmon section of the first transmission line, and the first radiation units and the first notches are located on the same side of the first transmission line. According to the leaky-wave antenna, based on the first plasmon segment included in the first transmission line, the binding capacity of an electromagnetic signal can be improved, radiation of the electromagnetic signal can be reduced, and therefore the transmission efficiency of the electromagnetic signal can be guaranteed, and meanwhile small-size arrangement of the leaky-wave antenna can be conveniently achieved; besides, the first radiation unit radiates the antenna signal outwards, so that the high gain of the antenna signal can be ensured on the basis that the first transmission line has relatively high transmission efficiency.

The invention belongs to the technical field of far infrared refractive index detectors, and particularly relates to a far infrared refractive index detector based on a thin metasurface and a preparation method of the far infrared refractive index detector. The method comprises the following steps: providing a polar dielectric substrate and a high-refractive-index material, obtaining dielectric functions of the polar dielectric substrate and the high-refractive-index material through an ellipsometry test, performing full-wave numerical simulation by taking the obtained parameters as input, constructing a metasurface physical model, testing transmissivity and complex refractive index of a medium to be tested, and assembling a PMMA micro-channel, the metasurface and the medium to be tested into an integrated device to carry out joint test. And finally, the reflection spectrum of the assembly device in the far infrared band is obtained through an ellipsometry test. According to the invention, through a novel material model and model optimization, comprehensive performances of insensitivity of an incidence angle of a far infrared band, high narrow-band absorption, strong near field and high penetration depth are realized; therefore, the problems of strong incidence angle dependence, insensitivity to volume phase response, easy surface pollution / adsorption interference, high device size and complexity, low detection efficiency and the like in the traditional technology are effectively solved.

The invention relates to an insulating operating rod body and a preparation method thereof, and belongs to the technical field of electric power safety tools and instruments and high-performance composite materials, the insulating operating rod body comprises a bearing core layer which is formed by an integrally-formed aramid fiber prefabricated body of a three-dimensional angle interlocking braided structure; the dielectric functional layer is a hydrophobic nano-porous silicon dioxide aerogel continuous network which is filled and fixed in internal pores of the aramid fiber preform of the bearing core layer, and silicon dioxide aerogel and aramid fibers are interwoven to form a three-dimensional interpenetrating structure; and the functional gradient protective layer is a resin-based composite material layer coated outside the dielectric functional layer. Three-dimensional weaving, nano-porous aerogel and gradient resin technologies are combined, the mechanical strength, the interface performance, the electrical insulating property and the weather resistance of the rod body are synergistically improved, unification of light weight and high reliability is achieved, and the rod body is particularly suitable for high-voltage and extra-high-voltage live working.

The invention belongs to the field of low-dielectric functional composite materials, and particularly relates to a low-dielectric-constant hydrophobic anti-icing prepreg, a preparation method and a composite material component. According to the prepreg, low-dielectric resin serves as a matrix, reinforced fibers and hydrophobic components in gradient distribution are compounded, the low-dielectric characteristic that the dielectric constant is smaller than or equal to 3.0 (10 GHz) is kept, the synergistic effect that a surface layer efficiently prevents and removes ice and an inner layer guarantees mechanical and dielectric properties is achieved through gradient distribution of the hydrophobic components, and the preparation method has the advantages that through distributed gum dipping and special-shaped compression roller regulation and control; the coating is suitable for high-frequency communication components which need excellent low dielectric properties and need anti-icing and deicing functions, and the problems that a traditional anti-icing and deicing coating is poor in compatibility with a low dielectric substrate and the dielectric properties are interfered are solved.

The invention discloses an organic-inorganic hybrid reversible phase change material as well as a preparation method and application thereof, and belongs to the field of functional materials. According to the organic-inorganic hybrid reversible phase change material, N, N, N-trimethyl isopropylamine and a halogen substituted derivative thereof are used as organic cations, an iron halide anion [FeX] (X = Cl, Br) with a tetrahedral configuration is used as an inorganic anion, and a molecular crystal is prepared through a solution evaporation method. The material is subjected to reversible solid-solid phase change in a mild temperature range (about 330-356 K) close to the working temperature of a device, and is obviously changed along with the dielectric constant in a phase change temperature region. The phase change temperature and the dielectric response behavior can be adjusted by cooperatively regulating and controlling the structure of the organic cation and the type of the inorganic halogen complex anion. The material is mild in preparation method, is suitable for amplification and film processing, and can be used for a dielectric regulation and control structure, a reconfigurable dielectric unit and a packaging layer dielectric function module.

The invention provides a method and a system for non-contact inversion of semiconductor carrier concentration based on Fourier infrared transform spectrum. Aiming at the problems that a traditional electrical detection method, such as a Hall effect, needs device preparation and causes inevitable damage to a to-be-detected sample, the invention develops a non-contact inversion semiconductor carrier concentration measurement method based on a Fourier transform infrared spectroscopy FTIR technology and in combination with a Deroude Diode model. Acquiring transmission / reflection spectrum data of the semiconductor sample by using an FTIR spectrometer; secondly, according to an optical response behavior of a free carrier in a semiconductor, adopting a classical Dyde dielectric function model, and further fitting an experimental spectrum to obtain a plasma frequency, a line width, a background dielectric constant and the like in a dielectric function of the sample; and finally, calculating a carrier concentration value in combination with parameters such as the effective mass of the carrier. The method disclosed by the invention has the advantages of no contact, no damage, rapidness and wide application concentration range.

The present application belongs to the technical field of synthesis of all-organic polymer dielectric film, and particularly relates to a copolymerized polyamide with dielectric function containing nylon 1 chain segment and a preparation method, the preparation method of the dielectric polyamide film containing nylon 1 chain segment comprising the following steps: synthesis of nylon 1 with different polymerization degrees, butane diacid anhydride end-capping nylon 1, and salt formation of the end-capped product (referred to as "PA1 diacid") and piperazine, copolycondensation reaction of piperazine-PA1 diacid salt and piperazine-dodecanedioic acid salt, and hot-pressing forming, etc. In the present application, the piperazine-PA1 diacid salt and the piperazine-dodecanedioic acid salt are copolycondensed through high temperature and high pressure, the high dielectric constant of the nylon 1 chain segment is combined with the unique low dielectric loss of the piperazine nylon, the nylon 1 is embedded into the piperazine nylon matrix as a dielectric function chain segment, and the dielectric polyamide film containing the nylon 1 chain segment is directly prepared through simple hot-pressing forming.