82 results about "Electromagnetic metasurface" patented technology

The invention discloses a method for generating multiple orbital angular momentum beams, and mainly aims at solving the problems that multiple orbital angular momentum vortex beams which radiate towards different directions and are the same or different in mode number cannot be simultaneously generated under a single working frequency in the prior art. According to the implementation scheme, the method comprises the following steps: selecting a feed source, a wave beam radiation direction and a geometric position of each reflecting unit; calculating a compensation phase matrix required by each super-surface reflecting unit according to the geometric position, the working frequency and the required orbital angular momentum mode; selecting electromagnetic super-surface units with different sizes to design a phase-shift network; putting the feed source at the central axial position of the electromagnetic super-surface and making an incident wave sent out from the feed source radiate the electromagnetic super-surface to obtain a compensation phase provided by the phase-shift network; and generating multiple orbital angular momentum vortex beams with vortex wavefronts in the set direction. The method can effectively improve the capacity and the coverage area of an orbital angular momentum wireless communication system and is used for modulating and multiplexing different signals in the wireless communication system.

The invention discloses a filtering antenna with low profile, wide band and high gain. The antenna comprises an electromagnetic super-surface radiator and a feed part. The electromagnetic super-surface is constituted by non-uniformly small electrical units and is used as a high-efficiency radiator so that the bandwidth and gain of antenna are increased. At the same time, radiation zero points can be produced, and frequency selectivity can be increased through adjusting roll-off degree of an upper edge of a pass-band. According to the antenna, discrete micro-strip coupling slits are creatively used for feeding; metal via holes are introduced in between the micro-strip and floor; good filtering effect of low frequency stop band is guaranteed; roll-off degree of pass-band lower edges is increased. According to the invention, electromagnetic super-surface with filtering effect is creatively designed and is applied in filtering antenna; the antenna structure is simple and no complicated filtering circuit is used; The height is only 0.06[lambda]0; 10dB impedance bandwidth is 28.4%; antenna loss is low and efficiency reaches up to 95%; in-band average gain is 8.2dBi; out-band rejection is over 20dB; the stop-band is wide.

The embodiment of the invention provides an electromagnetic metasurface design method and device based on deep learning. The electromagnetic metasurface design method comprises the steps: carrying outforward prediction of electromagnetic metasurface design according to a deep learning model M1 to obtain a forward mapping relation between electromagnetic metasurface structures/arrangements and corresponding optical responses; and according to the deep learning model M2, carrying out reverse prediction of the electromagnetic super-design to obtain a reverse mapping relationship between the electromagnetic super-surface structure/arrangement and the corresponding optical response. In forward prediction, the defect that a traditional method depends on numerical simulation iteration to solve the problem that a Maxwell equation is complex and time-consuming is overcome, the calculation complexity is greatly reduced, and the calculation time is shortened. In the reverse design, the geometricparameters of the electromagnetic super-unit are effectively discovered and optimized by using the reversely designed deep learning model obtained by training, and the electromagnetic super-surface structure/arrangement under different incident wave information is obtained in real time, so that the electromagnetic super-surface design which is customized by a user and can be strained as requiredis realized.

The invention discloses a MIMO antenna array using an electromagnetic meta-surface covering layer. The MIMO antenna array comprises a meta-surface covering layer and an antenna array layer. The meta-surface covering layer comprises an upper covering layer and a meta-surface dielectric layer. The antenna array layer comprises a metal patch layer, an antenna dielectric layer and a metal floor layer.The antenna dielectric layer is arranged between the metal patch layer and the metal floor layer. An air layer is arranged between the meta-surface covering layer and the antenna array layer, and themeta-material covering layer and the antenna array layer are separated by a support structure. The upper covering layer comprises 20 basic units periodically arranged in 4 rows and 5 columns. The metal patch layer comprises two patch cells of the same size arranged on the E-plane or the H-plane. The array having quite close spacing between elements can be decoupled and the E-plane and H-plane coupled antenna array can be greatly decoupled and processing is easy.

The invention discloses an electromagnetic metasurface design method based on a support vector machine algorithm, and the method comprises the steps: building and training an auto-encoder and an artificial bee colony support vector machine model through a group of samples according to the relationship between a unit structure of a metasurface and electromagnetic characteristics, wherein the reflection amplitude curve is input, and the structural matrix of the metasurface is output; and inputting the design target of the reflection amplitude curve into the trained auto-encoder and artificial bee colony support vector machine model to generate a metasurface unit structure. The design speed is remarkably increased, and the efficiency is remarkably improved; the design is automatic; a result is directly obtained through the metamaterial and the design target of the metasurface, related professional knowledge of an electromagnetic field is not needed, an engineer can focus on the function of the metasurface more, and the design process does not need to be concerned.

The invention discloses a multi-beam radiation and polarization regulation design method based on an anisotropic electromagnetic metasurface. The method comprises following steps of calculating phase distributions needing to be satisfied for forming a single beam on the anisotropic electromagnetic metasurface according to the radiation angles of the single beam in two orthogonal directions; with respect to the beams with the same radiation angles in the two orthogonal directions, on the basis of satisfying the phase distributions of the single beam, designing the phase difference in the two orthogonal directions according to the polarization mode of each beam; carrying out vector superposition on the phase distributions of the multiple beams in the two orthogonal directions according to an aperture field superposition method, thus obtaining the final phase distributions on the anisotropic electromagnetic metasurface; and finding out the sizes of the anisotropic unit structures corresponding to the final reflection phase distributions according to the final reflection phase distributions on the anisotropic electromagnetic metasurface in the two orthogonal directions. Compared with the prior art, the method has the advantages that the polarization mode of each beam can be regulated and the multiple beams can be regulated.

The invention discloses an electromagnetic super-surface polarization converter based on solid state plasma. The electromagnetic super-surface polarization converter comprises a second dielectric substrate, a first dielectric substrate and an underlying metal reflector plate which are laminated from top to bottom in sequence; and a resonance unit, capable of realizing linear-circular polarizationconversion in an ultra wide band range, consisting of a metal patch, a solid state plasma resonance unit and a vanadium dioxide resonance unit is laminated above the second dielectric substrate. The excited state of the resonance unit composed of the solid state plasma is controlled through an external logic array program, and the phase-change state of a vanadium dioxide area is controlled throughtemperature, so that the linear-circular polarization conversion of the polarization converter in different frequency domain ranges is realized, and the frequency band dynamic control range of circular polarization can stretch over four wave bands such as X wave band, Ku wave band, K wave band and Ka wave band through reasonable parameter optimization.

The invention discloses an anisotropic reflection type electromagnetic metasurface-based broadband crossed polarized converter, and relates to a crossed polarized converter. The broadband crossed polarized converter consists of three layers of optical materials, including a one-dimensional metal grating, a printed circuit board and a metal film. The method comprises the following steps of (1) waveincoming: enabling linear polarized wave at the frequency of 8.7-13.2GHz to come to the metal grating directly or in an inclined manner; and (2) wave reflecting, wherein the wave reflected from the crossed polarized converter is the required reflective polarized wave. Anisotropic reflection of the anisotropic reflection type electromagnetic metasurface-based broadband crossed polarized converteralso can be generated in a relatively large incident angle, and can be adjusted by changing the geometric dimensions; and in addition, the provided crossed polarized converter has the advantages of relatively wide bandwidth, high efficiency and the like in multiple potential applications of a microwave instrument, wavefront treatment and polarized component and the like.

The invention discloses a hybrid mechanism electromagnetic metasurface for broadband wide-angle RCS reduction. The hybrid mechanism electromagnetic metasurface mainly solves the problems that in the prior art, the RCS reduction bandwidth is narrow, and the angle stability is poor. The metasurface is composed of an upper dielectric plate (2) and a lower dielectric plate (3) which are tightly attached to each other, a metasurface structure layer (1) is arranged on the upper surface of the lower dielectric plate, and a metal reflecting plate (4) is arranged on the lower surface. The metasurface structure layer is formed by clockwise rotating 2*2 mixed mechanism metasurface modules along the center of the structure, and each metasurface module is composed of 4*4 mixed mechanism metasurface units. Each mixing mechanism metasurface unit is composed of three sets of L-shaped metal patches with different lengths, two sets of metallized through holes and two sets of lumped resistors welded to the metasurface unit, and the metasurface units and the metal reflecting plate are connected into a whole through the metallized through holes. According to the invention, the reduction bandwidth of the RCS is broadened, the angle stability of the metasurface is improved, and the hybrid mechanism electromagnetic metasurface can be used for reducing the RCS of the broadband wide-angle radar scattering cross section.

The invention provides a converging device of vortex electromagnetic waves. The converging device comprises an electromagnetic metasurface and a vortex electromagnetic wave generating device; the electromagnetic metasurface comprises five dielectric plates which are sequentially stacked and do not contact each other; the central positions of the upper surfaces of the first dielectric plate, the second dielectric plate, the fourth dielectric plate and the fifth dielectric plate are printed with periodically-arranged M*N square metal patches, wherein M is larger than or equal to 2, and N is larger than or equal to 2; and the upper surface of the third dielectric plate is printed with metal patches with periodically-arranged M*N rectangular slits which are formed through etching; the dielectric plates are fixed through a bracket; the vortex electromagnetic wave generating device is fixed on the central axis of the sides of the dielectric plates on the electromagnetic metasurface, the metal patches being printed on the sides of the dielectric plates; vortex electromagnetic waves generated by the vortex electromagnetic wave generating device enjoy phase compensation by means of equivalent capacitance and inductance generated by mutual resonance between the unit metal patches of the electromagnetic metasurface, so that a plane phase can simulate a spherical phase, and therefore, theconvergence characteristic of the vortex electromagnetic waves can be completed.

The invention discloses an electromagnetic super surface-based environment radio-frequency micro energy collection device, which comprises a dielectric substrate, wherein a metal floor is laminated on the back surface of the dielectric substrate; a metal ring structure is laminated on the front surface of the dielectric substrate; the dielectric substrate is of a rectangular structure of which the surface is in a square form; metalized through holes are arranged on the diagonal lines of the surface of the dielectric substrate; the metal floor is in the square form and the side length is equal to that of the square on the surface of the dielectric substrate; the metal floor, the metal ring structure and the dielectric substrate are coaxial; the metalized through holes are connected with the metal ring structure on the front surface of the dielectric substrate; and the metalized through holes are connected with the metal floor through loading resistors. The electromagnetic super surface-based environment radio-frequency micro energy collection device is simple and compact in structure, can keep high load energy collection efficiency within a wide-angle incident range when an incident electromagnetic wave is in an arbitrary polarization mode, is applied to energy supply of a wireless sensor network, and has a wide application prospect in the aspects of the internet of things, a wireless sensor and the like.

The invention discloses a rapid air interface testing method based on an electrically-adjustable wave-absorbing metasurface. The method comprises the following steps: 1, deploying an electrically-adjustable wave-absorbing metasurface on one or more cavity walls of a reverberation chamber, wherein the electrically-adjustable wave-absorbing metasurface is an electromagnetic metasurface and has two working modes of total reflection and total absorption; 2, putting a reference antenna and a plurality of to-be-tested devices required by testing into the reverberation chamber, and enabling the electrically-adjustable wave-absorbing metasurface in the step 1 to work in a total reflection mode through a program to complete a reference test; 3, switching the electrically-adjustable wave-absorbing metasurface in the step 2 to work in a full absorption mode through a program, and switching back to the total reflection mode after a certain time to complete the test of the specified to-be-tested device; and 4, repeating the step 3 till that the tests of all the to-be-tested devices are completed. On the premise of not influencing the uncertainty of measurement, the total time of the air interface test can be remarkably shortened, and the air interface test of the plurality of to-be-tested devices can be quickly completed.

The invention discloses an electromagnetic super surface complementary structure-based environment radio-frequency micro energy collection device, which comprises a dielectric substrate, wherein a metal floor is laminated on the back surface of the dielectric substrate; a metal patch structure is laminated on the front surface of the dielectric substrate; the metal floor is in a square form and the side length is equal to that of the square on the surface of the dielectric substrate; the metal patch structure is in the square form and the side length is smaller than that of the square on the surface of the dielectric substrate; the metal floor, the metal patch structure and the dielectric substrate are coaxial; the dielectric substrate is of a rectangular structure of which the surface is in the square form; metalized through holes are arranged on the diagonal lines of the surface of the dielectric substrate and are connected with the metal patch structure laminated on the front surface of the dielectric substrate; and the metalized through holes are connected with the metal floor through loading resistors. The electromagnetic super surface complementary structure-based environment radio-frequency micro energy collection device is simple and compact in structure, can keep high load energy collection efficiency within a wide-angle incident range when an incident electromagnetic wave is in an arbitrary polarization mode, and is wide in application.

The invention discloses a lithium tantalate narrowband detector and a preparation method thereof, and belongs to the field of pyroelectric infrared detectors. The detector comprises a detector body and an electromagnetic ultra-surface structure, wherein the electromagnetic ultra-surface structure is arranged on the detector body, the detector body comprises from bottom to top, a silicon pedestal support, a lower electrode, a lithium tantalate wafer and an upper electrode, and the electromagnetic ultra-surface structure comprises, from bottom to top, a gold backboard, a dielectric layer and an antenna. The gold backboard and the upper electrode are the same one article. The invention further provides a method for preparing the lithium tantalate narrowband detector. Ultra-surface technology is employed to overcome the defects of lack of wavelength selectivity wavelength selectivity in a conventional pyroelectric detector, detection of specific wavelength in a certain wavelength scope can be realized, and the preparation flow of an infrared detector is simplified.

The invention provides an electromagnetic metasurface. The electromagnetic metasurface comprises a plurality of encoding sub-modules, each encoding sub-module comprises a first dielectric plate, a second dielectric plate, a metal reflection floor, a third dielectric plate and an air pressure switch which are sequentially arranged in the preset direction, a basic unit empty groove and a vertical through hole are formed in each second dielectric plate, and the bottom of each basic unit empty groove is communicated with the corresponding vertical through hole; a liquid metal liquid storage tank is arranged in the third dielectric plate and is communicated with the vertical through hole in the second dielectric plate; the metal reflection floor is composed of a metal patch with a hole, and anopening is formed in the center of the metal reflection floor and communicated with the vertical through hole; and the air pressure switch is arranged at the bottom of the third dielectric plate and is communicated with the liquid metal liquid storage tank in the third dielectric plate.

The invention discloses a source stirring method of an electrical modulation electromagnetic wave orbit angular momentum mode for reducing reverberation room measurement uncertainty. An electrically modulated vortex electromagnetic metasurface is deployed in a reverberation room, thus, a brand new degree of freedom is introduced; for the electromagnetic wave orbit angular momentum, various independent electromagnetic wave orbit angular momentum modes can be controlled and switched through an electrical modulation mode, independent sample number is increased effectively, the source stirring method can be used simultaneously with other stirring methods under a limited space condition, measurement uncertainty is reduced further, when the source stirring method is used simultaneously with theother stirring methods, and under a condition where total sample number is fixed, overall test time can be controlled through control of the number of work modes of the electromagnetic metasurface. The method provided by the invention can effectively reduce measurement uncertainty of the reverberation room, and has the characteristics of occupying small space, using simple modulation modes, needing short test time, being convenient to make, and being low-cost.

The invention relates to a vortex electromagnetic metasurface structure, which belongs to the technical field of microwave band electromagnetic wave regulation and control, and solves the problem thatvortex beams generated by an existing vortex electromagnetic metasurface structure are difficult to be compatible with performances such as ultra-wideband, polarization insensitivity and high gain, so that the working efficiency is relatively low. The vortex electromagnetic metasurface structure comprises a plurality of vortex electromagnetic metasurface units arranged in a two-dimensional arraymode. The vortex electromagnetic metasurface unit comprises an I-shaped metal unit, a middle layer dielectric substrate and a bottom layer metal grounding plate which are sequentially stacked from topto bottom; the rotation angle of the I-shaped metal unit on the vortex electromagnetic metasurface unit is determined based on the vortex phase. Vortex wave beams generated based on the vortex electromagnetic metasurface structure can be compatible with ultra-wideband, polarization insensitivity, high gain and other performance at the same time, and the working efficiency of the vortex electromagnetic metasurface structure is improved.

The invention discloses an optically transparent electromagnetic metasurface for broadband and wide-angle RCS reduction, which is composed of three indium tin oxide (ITO) thin film layers and two polyethylene glycol terephthalate (PET) dielectric layers, wherein the surface ITO layer and the middle ITO layer are respectively composed of N * N metasurface modules arranged in a chessboard mode; each metasurface module is composed of M * M basic units, every two adjacent metasurface modules are distributed in a clockwise rotating mode along the center, the upper ITO layer is composed of a set of L-shaped patches arranged along the diagonal line, and the middle ITO layer is composed of a set of L-shaped patches arranged along the diagonal line and a set of arched strips. The optically transparent electromagnetic metasurface further comprises a bottom ITO layer reflecting plate. The problem that compatibility of RCS reduction and optical transparency is difficult to achieve in the prior art is solved. The optically transparent electromagnetic metasurface has the advantages of being good in broadband and wide-angle RCS reduction performance, optical transparency and the like and has potential application in scenes needing optical transparency or perspective observation and RCS reduction at the same time.

The embodiment of the invention provides a data sending method, a device and a system applying an electromagnetic metasurface array. The method comprises the following steps: obtaining first to-be-sent data, and after the first to-be-sent data is obtained, according to the constellation information of the first to-be-sent data and the mapping relation between the constellation information and a sub-array, determining a first target sub-array used for sending the first to-be-sent data, the first target sub-array being a sub-array of an electromagnetic metasurface array, and the first target sub-array comprising a preset number of array units; and after the first target sub-array is determined, controlling the first target sub-array to perform amplitude and phase modulation on an incident carrier signal reaching the first target sub-array according to the constellation information, and sending a carrier signal corresponding to the modulated first to-be-sent data by the first target sub-array. According to the mode, the problem of out-of-band interference can be avoided while the simultaneous modulation of the amplitude and the phase is realized, and the data transmission quality and the data receiving are ensured not to be influenced.

The invention discloses an electromagnetic metasurface-loaded narrow wave beam WLAN AP antenna. A circular parasitic patch is loaded above a square radiation patch; the square radiation patch and thecircular parasitic patch are fixed above an antenna grounding plate through an insulating medium supporting column to form an original type WLAN AP antenna; the original type WLAN AP antenna performsfeeding in different positions of the square radiation patch by adopting a 50-<ohm> coaxial line for realizing dual polarization; the WLAN AP antenna disclosed in the invention has the working frequency band of 5.15-5.95GHz and supports the dual polarization working mode; compared with the original type WLANAP antenna, the antenna disclosed in the invention has relatively narrow 3dB wave beam width and relatively high directivity, and the antenna is a dual-polarized narrow wave beam WLAN AP antenna capable of satisfying the use standard of IEEE802.11a/n; and the antenna can be widely applied to WLAN network coverage with indoor high-density user scenario requirement.

The invention provides a novel electromagnetic metasurface with a nonreciprocal transmission phase, which is formed by arranging units integrated with active devices (such as a radio frequency amplifier, a radio frequency gain module and the like), and the units have the nonreciprocal transmission phase characteristic by integrating the active devices into a pair of Wilgold power dividers. By designing the transmission phase of each unit, the metasurface can have a non-reciprocal transmission phase, and different non-reciprocal functions such as non-reciprocal energy transmission, non-reciprocal beam direction regulation and control, non-reciprocal beam focusing and the like can be designed at will. The antenna has the advantages of being easy to design, low in profile, low in cost, high in integration level, customizable in function and the like, and has important application prospects in the fields of high-performance antennas, electromagnetic transceiving systems and the like.

The invention discloses an ultrathin broadband coding RCS (radar cross section) reduction metasurface, which relates to the technical field of artificial electromagnetic metamaterials and is formed by arranging two metasurface units with the same reflection amplitude and the reflection phase difference of 180 degrees according to an optimization rule obtained by a PSO (particle swarm optimization) algorithm. According to the invention, two AMC structures are designed based on an array theory and are compounded, so that the RCS reduction effect bandwidth is effectively widened; according to a phase cancellation principle, optimization design is carried out by using a particle swarm optimization (PSO) algorithm to obtain an ultra-thin and ultra-wideband coding RCS reduction metasurface. The phase difference of the basic units of the two metasurfaces reaches 180 +/-1 degrees at the full-action bandwidth (21-35 GHz), so that the excellent performance that the relative bandwidth of the coding electromagnetic metasurface reaches 47.2% and the reduction effect exceeds 10 dB is achieved.