79 results about "Microwave band" patented technology

The invention provides an all-dielectric film system structure with visible near-infrared high absorption, intermediate infrared selective radiation and microwave high transmission. The all-dielectric film system structure sequentially comprises a protection and antireflection layer, a visible near-infrared absorption and infrared selective radiation layer and a substrate layer from top to bottom, the protection and antireflection layer comprises a first dielectric layer and a second dielectric layer which are arranged up and down; the visible near-infrared absorption and infrared selective radiation layer comprises a plurality of third dielectric layers and fourth dielectric layers which are alternately stacked. According to the structure, high absorption can be achieved in the wave band of 380-1100 nm, high reflection (low radiation) can be kept in the wave bands of 3-5 m and 8-14 m, high transmissivity is achieved in the microwave wave band, certain radiation can be kept in the wave bands of 5-8 m and 14-25 m, and effective heat management is achieved. The all-dielectric film system structure also considers the stability of the material in a space environment, and is provided with a protection and antireflection layer, so that the potential application reliability of the film system is improved.

The invention provides an all-dielectric film system structure with visible near-infrared low transmission vegetation simulation, intermediate infrared high reflection and microwave high transmission. The device sequentially comprises, from top to bottom, a visible near-infrared simulated vegetation layer which is composed of first to fourth dielectric layers and is configured to simulate vegetation reflection spectrum characteristics in a wave band of 380-2500 nm and has a low transmission characteristic; the intermediate infrared high-reflection layer is formed by alternately stacking a first dielectric layer and a third dielectric layer, and is configured to form high reflection in a wave band of 3-14 microns; and a substrate layer; the thickness of the whole film layer is far smaller than the microwave wavelength, so that the film system keeps high transmission in the microwave band. According to the invention, the amorphous InSb material with high loss characteristic in visible near-infrared light is introduced, so that the average transmissivity of 1500-2500 nm is reduced to 0.095 while high-precision simulation of the vegetation reflectivity spectrum is realized, thereby realizing simulation of low transmissivity of the wave band vegetation.

A polarization conversion transmission type reconfigurable metamaterial structure with amplitude-phase independent regulation and control is formed by copying and translating n * n basic units, and each basic unit comprises three dielectric layers, five metal layers and two air layers; the dielectric layers comprise a first dielectric layer, a second dielectric layer and a third dielectric layer from top to bottom; a first air layer is arranged between the first dielectric layer and the second dielectric layer, and a second air layer is arranged between the second dielectric layer and the third dielectric layer; the amplitude regulation and control layer is located on the upper surface of the first dielectric layer, and the amplitude regulation and control bias circuit layer is located on the lower surface of the first dielectric layer; the polarization conversion phase regulation and control layer is located on the upper surface of the second dielectric layer, and the polarization conversion phase regulation and control bias circuit layer is located on the lower surface of the second dielectric layer; the polarization gate layer is located on the upper surface of the third dielectric layer. According to the invention, efficient electromagnetic regulation and control in a transmission mode are realized, independent regulation and control in two dimensions of amplitude and phase are realized, and unification of high transmissivity and accurate regulation and control in a microwave frequency band is realized.

The invention discloses a method and device for establishing a moon infrared microwave radiation calibration model, and the method comprises the steps: obtaining an indication parameter of the radiation energy expression of the moon at a target moment in a reference remote sensing satellite observation wave band, and obtaining the radiation energy of the moon at the target moment; a plurality of reference remote sensing satellites or target moments are provided; the observation wave band comprises an infrared wave band and / or a microwave wave band; the indication parameters comprise the distance between the sun and the moon, a first angle parameter of the sun irradiating the moon and a second angle parameter of the reference remote sensing satellite observing the moon; and based on the indication parameters and the radiation energy corresponding to the indication parameters, training a pre-established neural network model to obtain a moon infrared microwave radiation calibration model. According to the method and device for establishing the moon infrared microwave radiometric calibration model, artificial intelligence and the moon infrared microwave radiometric calibration model are effectively combined, and the high-precision moon infrared microwave radiometric calibration model can be established.

The invention relates to the technical field of terahertz wave application, in particular to a terahertz low-pass filter based on a frequency selective surface, which comprises a first dielectric layer, a second dielectric layer, a third dielectric layer, a first metal layer and a second metal layer. The first dielectric layer, the second dielectric layer and the third dielectric layer are stacked in sequence; the first metal layer is arranged on the surfaces of the first dielectric layer and the third dielectric layer, and the first metal layer is formed by arranging four metal sheets in a square shape; the second metal layer is arranged between the first dielectric layer and the second dielectric layer and between the second dielectric layer and the third dielectric layer, and the second metal layer is of an annular structure with a through hole. According to the terahertz wave filter, the filtering effect on terahertz waves can be achieved, the working frequency band can cover a microwave band and a terahertz band, the cut-off frequency of the terahertz wave filter can be regulated and controlled, and the cut-off frequency range of the terahertz wave filter is 0.01-1 THz; the device is simple in structure and low in preparation difficulty; the band-pass filter has high transmissivity in a passband, and has a good stop-band suppression characteristic at a high frequency.

The application relates to the technical field of infrared stealth, precise thermal control and electromagnetic compatibility, and particularly discloses a film system structure with visible ultra-high reflectivity, middle-infrared and far-infrared low emissivity and microwave high permeability; the medium stack layer has high reflectivity to visible light; the metal microstructure layer has low emissivity to middle-infrared and far-infrared light and high permeability to microwaves; the film system structure has visible light reflectivity greater than 60%, middle-infrared and far-infrared light emissivity lower than 30% and microwave permeability higher than 60%. The application realizes perfect compatibility of infrared stealth and microwave absorption, keeps infrared low emissivity (epsilon < 0.1) and realizes high permeability (greater than 95%) to 1-18GHz microwave bands. The application solves the thermal failure problem of the composite stealth structure, realizes average visible light reflectivity (greater than 95%) through the medium stack layer, greatly reduces the solar heat load and improves the overall optical performance.

The invention relates to an asymmetric transmission wavefront modulation method based on a multilayer metasurface, and belongs to the technical field of polarization optics application. The problems that an existing metasurface unit is complex in structure and has symmetrical transmission limitation are solved. The cascaded metal grating and the metal'bidirectional arrow 'are used as basic structure units, the spatial symmetry in the electromagnetic wave propagation direction is broken, the asymmetric transmission characteristic is obtained, meanwhile, full-range phase modulation is achieved, electromagnetic waves incident in the two directions can be independently regulated and controlled by changing the size parameters of the unit structures, and the structure is simple. Corresponding deflection and convergence effects are achieved respectively. Therefore, the invention provides a microwave band sub-wavelength unit structure, which has the advantages of easiness in design, easiness in processing and the like, has an asymmetric property, and is applied to the fields of holographic display, information encryption and the like.

This invention discloses a visible transparent, ultra-wideband microwave absorption structure, comprising, from top to bottom, a visible transparent spatial shielding layer, an impedance-gradient absorption layer, and a total reflection bottom layer. The spatial shielding layer is highly transparent to the microwave band. The impedance-gradient absorption layer is composed of multiple layers of low-dielectric-constant transparent dielectric substrates and an array of transparent conductive patterns disposed thereon, stacked alternately. The total reflection bottom layer is totally reflective to the microwave band. By precisely designing the gradient period and equivalent resistance of the multilayer transparent conductive pattern array, and utilizing the electromagnetic coupling and multi-point resonance mechanism of the upper and lower layers, this invention achieves ultra-wideband microwave strong absorption of more than 90% in the 1-40 GHz frequency band at the subwavelength scale, breaking through the bandwidth limitation bottleneck of traditional microwave absorbing structures; and it also possesses excellent visible light transparency characteristics.

The application discloses a visible light-infrared-microwave compatible imaging metasurface, and relates to the technical field of electromagnetic compatibility, which comprises a surface infrared emission layer, an intermediate microwave functional layer and a reflective backboard; the surface infrared emission layer is attached to the lower surface of the intermediate microwave functional layer, and the reflective backboard is attached to the lower surface of the intermediate microwave functional layer; the surface infrared emission layer comprises two kinds of frequency selection surface structures with different duty cycles; the microwave functional layer is in a circular arc structure; a picture is attached to the bottom of the reflective backboard; by combining the surface infrared emission layer, the intermediate microwave functional layer and the reflective backboard, the false image effect can be generated in the visible light, infrared and microwave bands simultaneously, and the problem that the conventional metasurface is difficult to realize multi-spectrum compatibility is solved.

The invention discloses a CaLaPrNdGdFeO perovskite high-entropy ferrite wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The chemical composition of the material is (Ca < 0.2 > La < 0.2 > Pr < 0.2 > Nd < 0.2 > Gd < 0.2 >) FeO3. The preparation method comprises the following steps: dissolving metal nitrate and a complexing agent in water, adjusting to alkalescence to obtain a metal ion-complexing agent solution, heating to obtain gel, aging, drying and carrying out self-propagating reaction to obtain precursor xerogel; and then grinding, pre-sintering and carrying out heat treatment. The ferrite wave-absorbing material composed of the equimolar high-entropy components fully solves the disadvantages of narrow effective wave-absorbing frequency band and poor low-frequency performance stability of the traditional ferrite, has the advantages of strong synthesis stability, good oxidation resistance, high absorption efficiency and stable performance, can absorb electromagnetic waves in the microwave band of 2-18 GHz, and has a wide application prospect. And the material can be used in the fields of stealth coatings, electromagnetic shielding, 5G communication devices and the like.

The invention discloses a thermal radiation and microwave collaborative intelligent regulation device structure and a preparation method thereof, and belongs to the field of electromagnetic wave intelligent regulation. The problem that an existing device is difficult to achieve dynamic decoupling and coupling regulation and control between infrared and microwave bands is solved. The invention discloses a thermal radiation and microwave collaborative intelligent regulation and control device structure, which consists of a top VO2 layer, a SiO2 layer and a bottom VO2 layer in sequence from top to bottom. The preparation method comprises the following steps: 1, pretreatment; and 2, preparing a VO2 layer. The invention is used for the thermal radiation and microwave collaborative intelligent regulation and control device structure and the preparation thereof.

This invention relates to the field of optical imaging technology, specifically providing an optical radar co-aperture off-axis imaging system, comprising: an off-axis mirror assembly, a frequency-splitting device, a radar transceiver system, and an optical imaging system. The frequency-splitting device is disposed in the rear optical path of the secondary mirror and is used to reflect light waves and transmit microwaves. The frequency-splitting device includes a frequency-selective surface, which comprises an FSS pattern layer and a bias line layer. The FSS pattern layer includes periodically arranged FSS units. Nonlinear capacitors are electrically connected to the FSS units. The bias line layer applies a voltage to the nonlinear capacitors according to the received microwave band. By changing the voltage applied to the nonlinear capacitors, the resonant frequency of the FSS units is tuned, thereby changing the microwave passband frequency of the frequency-splitting device. This invention not only achieves a reflective wave-transmitting microwave design but also solves the problem that transmitting only a single band of microwaves in microwave-transmitting and light-reflecting methods is difficult to adapt to different task requirements.

A System and method for producing K-Net devices and improving a K-Net communication network on which the devices run to provide electronic services. A divided Net Extender extends the wireless network. K-Net devices utilize a modem card as an internal or external modem over Wi-Fi, cellular, millimeter wave and microwave bands. A processor on a circuit board coupled to a G chip or traffic controller chip embedded with a network control protocol and coupled to a dedicated cache memory manages networking of mobile devices and autonomous vehicles from a Local Area Network (LAN) manager device. A geographical internet protocol (Geo IP) enhances security. The modem connects to a wireless router device that runs a card control protocol, wherein the router plugs into the LAN manager device, connecting to internal and external DNS servers, GIP allocation and authentication servers. Devices are self-powered by alternating current generated from a direct current.

The invention discloses a cereal crushing impurity detection method and device based on a spectral imaging and deep learning hybrid network, belongs to the technical field of spectral analysis, and realizes accurate sparse selection of spectral features by constructing a feature wavelength extraction method with microwave band gating and physical prior constraint. By combining importance sorting and grouping fusion of the multi-dimensional characteristic wave bands, the effectiveness of the spectral characteristic image is improved; a detection model is constructed by taking lightweight GrainCINet as an encoder and layer-by-layer up-sampling fusion as a decoder, a multi-target parameter optimization strategy combining grid search preliminary screening with Bayesian iterative optimization is adopted, detection result comprehensive identification is carried out through category voting, on the basis, the crushing and impurity-containing condition of a sample is calculated through category pixel density and proportion, and the detection accuracy is improved. Finally, efficient, accurate and robust detection of the crushed grains and impurities of the grains is achieved, and the actual application requirements of grain quality detection are met.

Aiming at the deficiencies in the morphology and structure of NdFeO3 microwave-absorbing fine powders, the structure and morphology of the materials are improved through temperature processes. An open-pored peanut-shaped perovskite-type NdFeO3 microwave-absorbing fine powder material is invented and designed. The preparation method is as follows: Weigh neodymium(III) nitrate hexahydrate and iron(III) nitrate nonahydrate in a certain proportion, and then add citric acid monohydrate and ammonia water. The NdFeO3 microwave-absorbing fine powder is prepared by the sol-gel method. By controlling the pH, sintering temperature, and sintering time, peanut-pored perovskite-type NdFeO3 microwave-absorbing fine powder is prepared. It has good microwave absorption performance in the 15 - 18 GHz microwave band, and the particles are generally in the shape of neat and regular rice grains, providing the possibility for coating the material surface in the later stage to prepare directional reflection components. At the same time, by controlling the drying temperature, the process operation is made easy.

The invention provides a flexible cross-band compatible electromagnetic camouflage metasurface and a preparation method thereof, and the metasurface achieves high-absorptivity electromagnetic camouflage of visible-infrared bands through a micro-nano feature structure formed by a metal-dielectric material, and achieves high transmittance in a microwave band through the design of gaps of periodic patterns. The preparation method comprises the following steps: preparing the cross-band compatible electromagnetic camouflage structure on a hard substrate, and transferring the cross-band compatible electromagnetic camouflage structure to a flexible substrate through wet stripping or laser stripping and other processes. According to the invention, a visible-infrared wave-absorbing structure and a microwave transmission structure are organically integrated to form a cross-band compatible electromagnetic camouflage function layer, and the cross-band compatible electromagnetic camouflage function layer can be transferred to a flexible substrate to realize conformal fitting of complex curved surfaces such as a radome.

The utility model provides a cement-based electromagnetic wave-absorbing superstructure based on a stranded cable structure, a substrate of the cement-based electromagnetic wave-absorbing superstructure is made of a cement-based flat plate material, and a cement-based stranded cable periodic structure is arranged on the surface of the cement-based electromagnetic wave-absorbing superstructure. The cement-based electromagnetic wave-absorbing superstructure can achieve the technical index of excellent wave-absorbing performance, has the characteristics of wide frequency band and wide-angle wave-absorbing, and can achieve the effects that the average reflectivity in the microwave band of 1-40GHz is less than-15dB (the absorptivity is 96.8%), the effective absorption bandwidth of-10dB exceeds 60% of the total bandwidth, and the effective absorption bandwidth of-10dB exceeds 60% of the total bandwidth. And the average absorptivity under the large incidence angle of 60 degrees is not less than the average absorptivity under the normal incidence angle of 0 degree.

The application is a high degree of freedom far-field customized compact circularly polarized planar lens antenna. The application relates to the technical field of radiative metasurface antennas. Due to the limitation of space feed, it is difficult for metasurfaces in the microwave band to be applied to integrated systems. Here, the application realizes precise far-field radiation mode manipulation. Two E-shaped unit superimpositions constitute a geometric phase-based metasurface unit, realizing 2pi range transmission phase coverage and high transmittance. The application method realizes highly customized far-field mode control. Several proof-of-concept RTM prototypes are designed and manufactured, realizing energy-controllable multi-beam, wide-angle deflection and customized beamforming. Simulation and experimental results verify that the proposed method and RTM structure can provide a compact wavefront modulation platform and realize highly accurate and customized far-field beamforming.

The present application discloses an edge-side extreme weather identification method applicable to microwave radiometer data, which belongs to the field of remote sensing technology. It addresses the problem of low bandwidth and lack of real-time performance of satellite-to-ground communication in the existing technology. The method of the present application obtains brightness temperature data from a remote sensing satellite equipped with a microwave radiometer, filters out the corresponding remote sensing data packet, and constructs a microwave image containing multiple microwave bands and polarization information through data unpacking, brightness temperature data processing and image generation steps. According to the type and number of extreme weather that needs to be identified, a suitable network architecture is built for model training to generate an extreme weather identification model. Subsequently, quantization technology is used to optimize the trained model to ensure efficient operation on edge devices. The advantages of the present application are that it is efficient and practical, and is suitable for executing complex deep learning tasks in resource-constrained edge computing devices, providing an effective technical means for real-time monitoring of extreme weather.

The invention discloses a metasurface device for high-dimensional light field detection and a detection method of the metasurface device, and belongs to a light field detection technology. According to the metasurface device, a sub-wavelength slit array structure arranged along an Archimedes spiral line is etched on a metal film, and a transmission phase related to frequency and a geometric phase related to polarization are decoupled by utilizing the spatial dispersion and frequency dispersion characteristics of the array structure; therefore, the frequency and the polarization of the incident light are mapped to the topological charge and the composition coefficient of the plasmon vortex light. Through cooperation of the metasurface device and the neural network, the incident frequency and polarization information of the light field to be measured can be accurately extracted from the vortex light interference pattern, and synchronous analysis of multi-dimensional parameters of the light field is realized. The metasurface device not only can cover visible light, near-infrared and terahertz wave bands and even microwave wave bands, but also can extract multi-dimensional information of a light field, can realize accurate regulation and control of the light field on a micron scale through monolithic integration, and provides a solution for a compact optical system.

A microwave-optical transducer device, comprising: an optical cavity formed by a first dielectric substrate having a first optical reflector disposed thereon and a second dielectric substrate having a second optical reflector disposed thereon; a spin ensemble material disposed in the optical cavity, the spin ensemble material disposed on the second dielectric substrate; a planar microwave resonator disposed proximal to the spin ensemble material and inductively coupled thereto; and wherein: the optical cavity is configured to expose the spin ensemble material to an optical-range electromagnetic field; the microwave resonator is configured to expose the spin ensemble material to a micro wave-range electromagnetic field; the spin ensemble material, when exposed to a magnetic field and to an optical pump field having a driving frequency Ωp, to emit the optical-range electromagnetic field upon exposure to the microwave electromagnetic field, and to emit the microwave electromagnetic field upon exposure to the optical-range electromagnetic field.

The application is suitable for the field of silicon-based radio frequency and millimeter wave integrated circuit technology, and provides a satellite distributed configuration numerical control unit, a micro single sheet and an antenna unit, which comprises a decoupling capacitor module, a main control module and a distributed satellite module; the positive electrode of the decoupling capacitor module and the power supply pin of the main control module are connected with the power supply pin of the numerical control unit, and the negative electrode of the decoupling capacitor module and the ground pin of the main control module are connected with the ground pin of the numerical control unit; the distributed satellite module comprises a first satellite sub-module, a second satellite sub-module, a third satellite sub-module and a fourth satellite sub-module, and the connection mode of the first satellite sub-module with the main control module, the connection mode of the second satellite sub-module with the main control module, the connection mode of the third satellite sub-module with the main control module and the connection mode of the fourth satellite sub-module with the main control module are the same. The numerical control unit has the bandwidth universality suitable for various microwave bands and the universality suitable for various semiconductor manufacturing processes.

A large-frequency-ratio dual-frequency Fabry-Perot resonant cavity antenna comprises a dielectric substrate and a magnetoelectric dipole antenna on the dielectric substrate. The magnetoelectric dipole antenna is provided with a Y-shaped microstrip line feed structure, an electric dipole radiator with a rectangular groove and a magnetic dipole structure composed of two pairs of parallel metal plates perpendicular to the ground, and the integrated Fabry-Perot resonant cavity antenna comprises a series resonant cavity composed of upper and lower parallel metal plates and an F-shaped probe feed structure at the center of the ground. The antenna is characterized in that 1, microwave band dual-passband coverage, impedance bandwidth improvement and gain flatness optimization are realized through grooved electric dipoles and Y-shaped feed; 2, a metal plate structure is multiplexed, the size is reduced, millimeter wave dual-passband coverage is realized, and the plate spacing tolerance is improved; and 3, the Y-shaped and F-shaped probes are orthogonally arranged to improve frequency band isolation, the F-shaped probe realizes millimeter wave high peak gain, and the Y-shaped microstrip line realizes microwave band low in-band VSWR (Voltage Standing Wave Ratio).

The present invention discloses a multi-port, high-frequency-ratio antenna, comprising a metal floor and a dielectric substrate. Metal patches are connected to the surface of the dielectric substrate. The metal patches include a first metal patch and a second metal patch. The first and second metal patches are both E-shaped patches, each having a first branch and a second branch located in the center of the E-shaped patch. The first branch is provided with a first Vivaldi antenna unit, the second branch is provided with a second Vivaldi antenna unit, and the antenna further includes a third Vivaldi antenna unit and a fourth Vivaldi antenna unit. By integrating a dipole antenna unit with four Vivaldi antenna units, the specific shape of the dipole antenna unit provides two different resonant paths, achieving dual-band operation in the microwave band. The four Vivaldi antennas operate in the millimeter-wave band. The antenna can operate simultaneously in the microwave and millimeter-wave bands, achieving a high frequency ratio and covering commonly used Wi-Fi, Bluetooth, and 5G communication bands.

The invention discloses a metasurface for visible light-infrared-microwave compatible imaging, and relates to the technical field of electromagnetic compatibility, and the metasurface comprises a surface infrared emission layer, a middle microwave function layer and a reflection backboard. The surface infrared emission layer is attached to the lower surface of the middle microwave function layer, and the reflection backboard is attached to the lower surface of the middle microwave function layer; the surface infrared emission layer comprises two frequency selection surface structures with different duty ratios; the microwave functional layer is of an arc-shaped structure; a picture is attached to the bottom of the reflecting back plate; by combining the surface infrared emission layer, the middle microwave function layer and the reflection backboard, an illusion effect can be synchronously generated in visible light, infrared and microwave bands, and the problem that a traditional metasurface is difficult to achieve multi-spectrum compatibility is solved.

The invention belongs to the technical field of microwave frequency selective surface and infrared reflection focusing composite metasurface structures and design. A unit of a microwave band adopts a layered structure of metal pattern-ceramic dielectric-air gap-silicon substrate. The metal pattern is a miniaturized design of a three-order nested square patch, and the unit period is only 0.164 times of the working wavelength. According to the invention, a passive factor of a silicon substrate of an infrared band and an air gap generated by actual processing are creatively converted into an active design degree of freedom, and through collaborative optimization, a transmission coefficient higher than 0.99 at a center frequency of 15GHz, a-1dB bandwidth greater than 30%, and excellent angle stability under oblique incidence of 0-45 degrees are realized. The unit reflectivity of the infrared band is higher than 99% and close to 1, phase modulation can be achieved, and the infrared metasurface has a convergence function. The device is simple in structure and easy to integrate, and a new scheme is provided for realizing a function integrated device of microwave and infrared bands.

The invention relates to an artificial surface plasmon on-chip differential dual-mode transmission line based on Balun. The on-chip differential dual-mode transmission line comprises a differential dual-mode transmission line located in the middle, symmetrical Balun structures located at the two ends of the differential dual-mode transmission line and bonding pad structures located on the outer sides of the Balun structures. The differential dual-mode transmission line has three different structures which are respectively four metal strip lines which are parallel to each other and branch knots which are arranged among the metal strip lines. The four metal strip lines are parallel to one another; the cross-layer branch knots are positioned below the metal strip lines; the two pairs of parallel metal strip lines are distributed on different metal layers; and the branches are arranged between the metal lines on the same layer. Transmission of two pairs of differential artificial surface plasmon signals can be supported at the same time, and the differential artificial surface plasmon antenna is suitable for technologies of gallium arsenide, silicon nitride and other III-V chips, other chips, circuit boards and the like, and supports design of a terahertz wave band, a microwave band and a millimeter wave band.

The invention discloses a broadband wave-absorbing metamaterial of an umbrella-like polyhedral structure and application of the broadband wave-absorbing metamaterial, and belongs to the technical field of electromagnetic metamaterials. The broadband wave-absorbing metamaterial with the umbrella-like polyhedral structure comprises a substrate layer and an umbrella-like polyhedral structure layer, the bottom surface of the umbrella-like polyhedral structure layer is connected with the substrate layer; the umbrella-like polyhedral structure layer is a hemisphere-like body formed by connecting a plurality of gradient layers, and the bottom surface of the hemisphere-like body is a regular polygon; and the surface of each gradient layer is formed by splicing a plurality of similar trapezoids or similar triangles with the same size. The umbrella-like polyhedral structure and the gradient gradient structure are combined, the highly symmetrical structure design is adopted, the broadband wave absorbing performance can be shown in the microwave band, wave absorbing performance regulation and control and 100% effective wave absorbing in the full frequency band of 12.00-40.00 GHz can be achieved through parameter adjustment, the wave absorbing performance has polarization insensitivity, and high wave absorbing stability is achieved.

The application relates to a gap waveguide liquid crystal phase shifter, which comprises, from top to bottom, an upper layer structure, a middle metal layer and a lower layer structure; the upper layer structure comprises, from top to bottom, an upper metal layer, an upper dielectric plate, an upper glass plate, a metal patch and a liquid crystal layer; the lower layer structure comprises, from top to bottom, a lower glass plate, a lower dielectric plate and a lower metal layer; the upper dielectric plate is provided with a plurality of upper metal through holes, and the lower dielectric plate is provided with a plurality of lower metal through holes; the plurality of upper metal through holes form a gap waveguide type cavity, and the middle metal layer is provided with two slit structures. When a driving voltage is applied between the metal patch and the middle metal layer, the liquid crystal molecule deflection occurs, when the liquid crystal molecule reaches the full deflection state, the transmission phase change reaches the maximum value, and finally the continuous adjustable liquid crystal phase shifter is realized, thereby solving the problems that the traditional liquid crystal phase shifter has large loss in the microwave band and needs a certain transmission line length to achieve corresponding phase shifting capacity.

The application relates to the field of super surfaces and relates to a microwave band loss type super surface lens for observing chiral singular points. The application is aimed at solving the problem of difficulty in forming a plasmonic surface in a microwave band and introducing loss. The microwave band loss type super surface lens for observing chiral singular points comprises a plurality of double-resonance loop units arranged in a rectangular array, each double-resonance loop unit comprising a dielectric plate, an open resonant loop and a line structure; the open resonant loop comprises three coaxially nested rectangular loops and a rectangular sheet located at the center of the innermost rectangular loop, and one side of the outermost rectangular loop is provided with an opening; the line structure is in the shape of an I letter; the open resonant loop and the line structure are fixed on the dielectric plate, and a gap is left between the two. The application can realize the observation of X-band singular points by coupling resonance modes in two orthogonal directions and introducing loss without forming a plasmonic surface.