341 results about "Cross polarization" patented technology

The invention discloses a calibration system in an active channel of a waveguide array phased-array antenna, and relates to the technical field of calibration in the active channel. Comprising a calibration judgment module, a waveguide directional coupling module, an amplitude-phase detection module and a digital domain optimization module, the calibration judgment module realizes intelligent triggering calibration through real-time monitoring of a multi-dimensional environment and performance parameters, and ensures that a calibration process is started only when the system state is deteriorated; the waveguide directional coupling module ensures that the calibration signal is accurately injected into each channel, and realizes cross polarization suppression through a polarization grid filter; the amplitude-phase detection module realizes high-precision measurement of amplitude, phase, group delay and polarization parameters of feedback signals of each channel by using superheterodyne and IQ demodulation technologies; and the digital domain optimization module calculates and updates the complex compensation weight of each channel through real-time digital signal processing and a self-adaptive algorithm, and realizes comprehensive and accurate calibration in combination with temperature-frequency interpolation and nonlinear pre-distortion compensation.

The invention relates to the technical field of data fusion transmission, and provides a heterogeneous data fusion transmission method and system for airborne multimode satellite communication. Acquiring real-time communication parameters including a dynamic spectrum occupancy state, a polarization direction difference and a hidden transmission demand level; generating a dynamic frequency hopping control instruction based on the time-varying characteristic of the dynamic spectrum occupancy state, driving carrier switching and reserving a spectrum isolation area between adjacent carriers; performing orthogonal polarization diversity analysis on the carrier switching result based on the polarization direction difference, suppressing cross polarization interference and outputting multiple paths of baseband signals; calling a preset waveform parameter library according to the hidden demand level to determine a modulation parameter, and loading the baseband signal to the asymmetric phase subcarrier to generate a hidden modulation waveform; and fusing the frequency hopping instruction and the hidden modulation waveform to generate a cooperative modulation instruction, and controlling the radio frequency unit to realize anti-interference fusion transmission. According to the technical scheme provided by the invention, the anti-interference capability of fusion transmission of multi-mode satellite data in a dynamic spectrum environment is improved.

The present invention discloses a high polarization isolation dual-polarization tightly coupled ultra-wideband phased array antenna. It includes a dipole unit, a coaxial feed line, a metal reflective floor, a fishbone cross-shaped patch and a cross-shaped metal wall; the dipole unit includes a horizontal and two vertical dielectric substrates, and the vertical dielectric substrates are orthogonal to each other; two groups of coplanar and mutually perpendicular butterfly-shaped dipole units are printed on the lower surface of the horizontal dielectric substrate; a fishbone cross-shaped patch is embedded at the intersection of the ends of the dipole units, and there is a gap between the patch and the end of the dipole; a patch with an etched groove line is printed on one side of the vertical dielectric substrate; the patch is connected to the dipole; the microstrip line on the upper surface of the horizontal dielectric substrate is connected to the inner conductor of the coaxial feed line, and the dipole is connected to the outer conductor of the coaxial feed line; the fishbone cross-shaped patch is in contact with the cross-shaped metal wall. The present invention realizes high polarization isolation and low cross-polarization of the dual-polarization tightly coupled ultra-wideband phased array in a lower frequency band without the need for a complex feeding network.

The invention discloses a Ka-band four-tilt-beam magnetoelectric dipole antenna, and belongs to the technical field of millimeter wave radio frequency front-end devices. Based on a magnetoelectric dipole composite radiation structure, four centrosymmetric radiation units are integrated on a low-loss substrate. The antenna comprises a probe patch of a coaxial gamma-shaped feed probe, a radiation patch, a parasitic patch, an upper dielectric substrate, a lower dielectric substrate, a middle curing layer, a shorter metal through hole of the coaxial gamma-shaped feed probe, a longer metal through hole of the coaxial gamma-shaped feed probe, a metal through hole c of the radiation patch, a metal through hole d of the parasitic patch and a metal ground backboard, a probe patch, a radiation patch and a parasitic patch of the coaxial gamma-shaped feed probe are located on the upper surface of the upper-layer dielectric substrate, and a metal ground backboard is located on the lower surface of the lower-layer dielectric substrate; the antenna has ultra-wide impedance bandwidth, has the characteristics of low cost, miniaturization, low cross polarization and back lobe suppression, and is superior to a traditional inclined beam antenna and an antenna array scheme.

Embodiments are provided wherein a mobile device that is associated with a cellular system is configured to communicate with a second device that is associated with the cellular system subject to a time-varying, dispersive, multipath fading environment. The mobile device comprises an antenna system comprising a plurality of polarizations and a processor that is configured to reduce a cross-polarization interference caused by said time-varying, dispersive, multipath fading environment while the mobile device uses a first polarization and a second polarization of the plurality of polarizations to increase a transmission throughput of information and / or a reception throughput of information. The mobile device is further configured to perform operations including processing first and second signals received respectively on the first and second polarizations and to use a plurality of receive channel coefficients to perform first and second mathematical operations on the first and second signal, respectively.

Disclosed is a radiator assembly configured to operate in the range of 3.4-4.2 GHz. The radiator assembly comprises a folded dipole with four dipole arms that radiate in two orthogonal polarization planes, whereby the signal of each polarization orientation is radiated by two opposite radiator arms that radiate the signal 180 degrees out of phase from each other. The radiator assembly has a balun structure that includes a balun trace that conductively couples to a ground element on the same side of the balun stem plate. The combination of the shape of the folded dipole and the balun structure reduces cross polarization between the two polarization states and maintains strong phase control between the opposing radiator arms.

The invention relates to the technical field of array antennas, in particular to a sparse linear array beam forming method and system with unit rotation and mutual coupling considered. Array elements are obtained, Euler angle derivation is carried out on rotation of the array elements around the z axis, and a radiation electric field after rotation is obtained; setting a beam forming target according to the electric field of the radiation field; according to a beam forming target, optimizing the position, the rotation angle and the excitation phase of an array element by adopting a random optimization algorithm, and generating an initial beam scheme; an active directional diagram is extracted from the initial beam scheme according to full-wave simulation, the active directional diagram is combined with a CAL-SAPSO algorithm to optimize the array element position, the rotation angle and the excitation phase, and a final array element directional diagram is generated; according to the invention, by introducing array element rotation and considering a mutual coupling effect, efficient beamforming of the sparse wiring array is realized, the radiation characteristic of the antenna array can be adjusted more finely, the peak side lobe level and the cross polarization level are effectively reduced, and the overall performance of the system is improved.

The invention provides a terahertz tunable polarization converter and a design method thereof. The polarization converter is composed of three layers of metasurface structures. A Fabry-Perot cavity is formed through an orthogonal grating, horizontal polarization destructive interference and cross polarization constructive interference are achieved through polarization selectivity, and therefore the cross polarization average conversion efficiency up to 95% or above is achieved. Meanwhile, the working frequency of the device can be effectively adjusted by adjusting the interlayer spacing. The design method comprises the specific implementation steps that the initial structure size and the material attribute of the three-layer metasurface are set; setting an objective function representing the performance of the terahertz polarization converter, and importing the initial structure of the polarization converter into electromagnetic field simulation software for simulation to obtain an objective function value of the initial structure of the polarization converter; and performing iterative optimization on the three-layer metasurface initial structure by using a multi-target particle swarm optimization algorithm until the optimized structure meets the target requirement, and obtaining the optimal design parameters of the metasurface structure.

The invention belongs to the technical field of communication, and particularly relates to a broadband, high-gain and circularly-polarized filtering folded transmission array antenna, which comprises a planar integrated feed source antenna, an SIW-Mini-SMP transition structure, a reflection type cross polarization converter RCPC and a transmission type metasurface TMMS capable of effectively generating circularly-polarized electromagnetic waves. The working frequency range of the antenna is 12.0 GHz to 18.3 GHz, the antenna covers the whole Ku wave band, the bandwidth is 41.6%, and the antenna has remarkable broadband characteristics; high gain is kept in the working frequency band, the peak gain is 22.64 dBic, and the advantage of high gain is shown.

The invention discloses a dual-polarization radar multi-parameter fusion rainfall estimation system and method, and relates to the technical field of meteorological radars, and the system comprises a data collection module which is used for starting a dual-polarization radar to carry out long-term observation when an observation scene with uniformly distributed light rain weather appears, recording radar polarization parameters at different elevation angles, and carrying out the data collection module; transmitting to the deviation analysis module; the deviation analysis module is used for receiving the radar polarization parameters and calculating ZDR statistical characteristics according to the reference uniform scene; according to the invention, by constructing the antenna isolation elevation angle dependence model, dynamic reverse correction is carried out on ZDR and rhohv measurement values under different elevation angles, the influence of dynamic degradation of the antenna cross polarization isolation along with the scanning elevation angle on the measurement values is effectively eliminated, and real-time sensing and compensation of the isolation degradation along with the dynamic change of the elevation angle are realized; the radar can keep high measurement precision in the whole scanning space, and the conditions of precipitation phase state misjudgment and missing report are reduced, so that the accuracy of precipitation estimation is improved.

The invention relates to a polarization reconfigurable array antenna beam forming method using a polarization selection dictionary matrix, and aims to solve the problems that an existing reconfigurable array polarization selection algorithm is low in calculation efficiency, high in parameter sensitivity and incapable of achieving beam scanning. The method comprises the following steps: firstly, giving an expected main polarization direction and a cross polarization direction; then, according to the polarization state which can be provided by each unit, constructing a polarization selection dictionary matrix used for selecting a unit polarization mode; then, according to the polarization selection dictionary matrix and a given polarization direction, constructing a corresponding main polarization beam matrix and a cross polarization beam matrix; and finally, converting a non-convex polarization selection problem into a convexity problem for solving. Compared with an existing stochastic optimization algorithm in the field of polarization reconfigurable array beam forming, the method has higher efficiency and better stability, so that the method has higher practical value.

The invention discloses a dual-polarization one-dimensional scanning phased-array antenna and a weather radar system, the antenna comprises a radiation layer, a first feed layer, a first PCB layer, a second feed layer, a second PCB layer and a third feed layer which are stacked from top to bottom, and a horizontal polarization radiation unit and a vertical polarization radiation unit of the radiation layer are arranged in an orthogonally staggered manner; each first feeder is etched on the top surface of the first PCB layer and corresponds to a first metal groove formed in the bottom of the first feed layer and a second metal groove formed in the top of the second feed layer in position; and each second feed line etched on the top surface of the second PCB layer corresponds to the position of a third metal groove formed in the bottom of the second feed layer and the position of a fourth metal groove formed in the top of the third feed layer. According to the invention, high cross polarization isolation is realized, and the antenna has dual polarization beams with low side lobes and consistent beam width and pointing height in the whole working frequency band.

The invention discloses a double-frequency circularly polarized antenna element, which belongs to the technical field of antennas and comprises a high-frequency-band radiation unit and a low-frequency-band radiation unit. The high-frequency band radiation unit comprises a first dielectric substrate and a first feed probe. A first radiation patch is embedded in one end face of the first dielectric substrate, and the first radiation patch is provided with two symmetrical chamfers. The top end of the first feed probe passes through the first through hole and is fixedly connected with the first radiation patch. The low-frequency-band radiation unit comprises a second dielectric substrate, a second radiation patch and a third dielectric substrate. The second radiation patch is arranged on the second dielectric substrate. The second dielectric substrate is provided with a second metalized through hole. The third dielectric substrate is provided with a Chebyshev Balun feed printed line. The antenna element provided by the invention not only can realize the circular polarization of the antenna, but also can reduce the coupling between antennas of different working frequency bands while expanding the bandwidth of the antenna, improve the isolation between two working frequency band ports, and reduce the cross polarization.

The invention relates to the technical field of radar target characteristic analysis, in particular to a radar near-field target polarization characteristic analysis method based on a vector Green function. Firstly, a target three-dimensional scattering point model is constructed, a coordinate-based scattering coefficient is defined, a full-polarization observation mode is designed, a near-field measurement matrix is calculated based on a vector Green function, and an observation model is constructed. Secondly, designing a fusion far-field constraint orthogonal matching pursuit (OMP) algorithm, realizing high-precision inversion of scattering coefficients, calculating a target far-field single-station RCS (HH / HV / VV mode) through dynamic polarization-based projection and phase compensation, and establishing a near-far field scattering characteristic mapping model; according to the method, near-field three-dimensional imaging and far-field polarization characteristic analysis are fused, the problem of insufficient cross polarization component recovery in a traditional method is solved, and the method has the advantages of high-resolution imaging, multi-physical field collaborative optimization, adaptive noise suppression and the like, and can be applied to the fields of stealth target recognition, radar cross section testing, unmanned aerial vehicle navigation and the like.

An antenna system for tracking multiple satellites comprises an RF lens (homogeneous or multiple layer Luneburg) with numerous feeds placed around the lens in a tightly packed arrangement to maintain high cross-over points between beams and high circularity. High-quality circular polarization, consisting of low axial ratio and low cross polarization levels, is maintained using a novel dielectric slab to compensate for the slight mismatch in phase delay through the lens from the two canonical polarizations vertical and horizontal. A weighted combination of beams is used to keep the resultant beam peak fixed on a satellite with the ability to use this approach in a number of places simultaneously, and simultaneously using one or more of these methods at multiple frequency bands.

The invention relates to a low-profile dual-polarization metasurface filtering antenna applied to Sub-6GHz, which comprises a first dielectric substrate, a metasurface is printed on the upper surface of the first dielectric substrate, a second dielectric substrate is downwards arranged on the upper surface of the first dielectric substrate, a metal floor is clamped between the first dielectric substrate and the second dielectric substrate, a first metalized through hole and a second metalized through hole are formed in the second dielectric substrate, and the first metalized through hole is communicated with the second metalized through hole. A first microstrip feeder line and a second microstrip feeder line are printed on the lower surface of the second dielectric substrate, and the first microstrip feeder line and the second microstrip feeder line intersect vertically. According to the invention, the metasurface structure is introduced, and by means of the metasurface structure, the antenna obtains a relatively wide impedance bandwidth 21.61% and a relatively high gain; under the condition that an extra filter circuit is not introduced, the low-frequency radiation zero point is introduced only by adding the n-shaped branch knot, and the radiation zero point frequency and out-of-band rejection can be adjusted by adjusting related parameters; according to the invention, while high isolation is realized, the cross polarization discrimination rate also exceeds 30dB; the antenna is simple in overall structure, low in manufacturing cost and easy to integrate.

The invention specifically provides a low-cross-polarization ultra-wideband wide-angle scanning low-profile tight coupling phased-array antenna based on metal grid loading, and belongs to the technical field of microwave antennas. The three-order Chebyshev impedance transformer comprises a C-shaped ring metasurface loading wide-angle matching layer, a folded dipole, a double-Y balun, a three-order Chebyshev impedance transformer, a coaxial feed port, a metal floor, a metal grid, a grounding metal sheet, a resistive film, a dielectric layer and a metal chip resistor. Different polarization electromagnetic waves are regulated and controlled through the metal grid, the resistive film is introduced to absorb cross polarization components, the front-to-back ratio is improved, and the cross polarization level is smaller than or equal to-30 dB; the working bandwidth is expanded to 5.6: 1 under the condition that the profile is only 0.09 lambda by combining the size design of the non-uniform unit and the gradient balun feed, and the scanning of the wide angle of + / -60 degrees of an E surface and an H surface is supported. The invention has the advantages of compact structure, high polarization purity and wide-angle stability, and is suitable for 5G / 6G communication, radar and electronic countermeasure systems.

The invention discloses a non-uniform compression high-order mode + / -45-degree dual-polarized base station antenna. The non-uniform compression high-order mode + / -45-degree dual-polarized base station antenna comprises a single-layer dielectric substrate, two pairs of non-uniform compression five-order mode dipoles and two pairs of fundamental mode dipoles, wherein the two pairs of non-uniform compression five-order mode dipoles are printed on the single-layer dielectric substrate; a balun coupling feeding mode is adopted, and SMA is used for exciting a high-order mode dipole and a fundamental mode dipole to generate radiation. According to the non-uniform compression high-order mode + / -45-degree dual-polarized antenna, due to the introduction of the non-uniform compression high-order mode dipole, the gain is effectively improved, the phase of an electric field is adjusted through the bending of the coplanar strip line, the amplitude of the electric field is adjusted through the adjustment of the size of the coplanar strip line and the design of the reflecting plate, and the cross polarization ratio is effectively improved.

A single-layer broadband vertically polarized endfire magnetoelectric dipole (ME-dipole) antenna and an antenna array. The main radiator of this antenna is a substrate-integrated closed loop, which consists of two horizontal metallic strips printed on the upper and lower surfaces of substrate and a pair of vertical metallic vias. Excited by a double-sided parallel-strip line at the center of the loop, the metallic vias function as electric dipoles while the entire loop aperture works as magnetic dipole. To facilitate integration, this magnetoelectric dipole loop antenna is fed by an open-ended substrate integrated waveguide (SIW), which also works as a backed cavity to enhance the front-to-back ratio. Moreover, rectangular slots are etched at the edges of the SIW aperture to further improve the front-to-back ratio and also the cross-polarization performance. Thus, a vertically polarized endfire ME-dipole loop antenna with a low-profile structure, broad bandwidth, and stable radiation performance is achieved.

The invention relates to the technical field of image recognition, in particular to a blueberry fruit detection method and system based on image recognition. Performing imaging monitoring on the blueberry fruits based on a cross polarization imaging technology to obtain a blueberry polarization image and a blueberry standard image; identifying the blueberry standard image to determine a blueberry development stage; based on a blueberry development stage, selecting an image segmentation strategy to carry out adaptive segmentation on the blueberry polarization image to obtain a white frost fruit powder mask; performing mask identification on the blueberry polarization image, the blueberry standard image and the white frost fruit powder to obtain white frost fruit powder features; obtaining white frost fruit powder characteristics with time labels to obtain fruit powder time sequence characteristics; the method comprises the following steps: identifying time sequence characteristics of fruit powder, analyzing a cooperative relationship between evolution of fruit powder characteristics and peel ground color, comparing with standard time sequence characteristics, and dividing into a normal development type and an abnormal development type; according to the method, fruit detection information is output through time sequence feature recognition of fruit powder of a normal development type and an abnormal development type.

The invention relates to the technical field of microwave remote sensing, in particular to a Ku, Ka and W three-frequency-band meteorological radar multi-source joint detection system and method and a storage medium, and the system comprises an antenna feeder subsystem, a main control computer, an integrated digital processor, a Ku / Ka integrated radio frequency machine, a Ku-frequency-band power amplifier, a Ka-frequency-band power amplifier, a W-frequency-band transmitter, a W-frequency-band power amplifier, a W-frequency-band receiver and a servo mechanism. The system is designed according to a working mode and working parameters of a main control computer, realizes multiple functions such as Ku / Ka / W single-frequency-band independent working or multi-frequency-band simultaneous working and the like, and has co-polarization and cross-polarization echo signal receiving capability; by controlling the servo mechanism, two modes of fixed-point detection and conical scanning detection are realized, and detection requirements of different meteorological elements are met; the detection capabilities of three frequency bands of Ku, Ka and W are integrated in the system, the detection mode is flexibly configured according to weather conditions and detection requirements, the system has the multi-frequency-band, multi-polarization and multi-element integrated detection capability, and the detection efficiency of the meteorological radar is improved.

The invention discloses a dual circularly polarized phased-array antenna based on triangular grid arrangement. A phased-array antenna module sub-array is formed by triangular grid arrangement of phased-array antenna units; the radiation unit adopts a cross oscillator with a gradual change structure, the impedance matching is improved, and a feed network of a three-branch linear bridge is matched, so that the impedance bandwidth of the antenna is improved, and the requirements of more communication frequency bands are met; the orthohexagonal antenna unit appearance and the metal partition wall are adopted, so that mutual coupling between the antenna units is reduced, and the isolation degree between the antenna units and the overall performance are improved; triangular grid arrangement is adopted, and the problems that the scanning range of a traditional rectangular array is limited, and grating lobes are prone to occurring during large-angle scanning are solved; the device has higher polarization purity and lower cross polarization level, supports quick splicing of N * N subarrays, and has the advantages of simple structure, low cost and easiness in processing.

The invention discloses a multichannel microwave diagnosis system, which comprises a multichannel microwave generation and emission system, a Doppler backscatterometer DBS system, a cross polarization scattering diagnosis CPS system and a frequency-adjustable reference source, and is characterized in that the multichannel microwave generation and emission system is used for generating multichannel scattering signals; the Doppler backscatterometer DBS system and the cross-polarization scattering diagnosis CPS system are integrated and share the multi-channel microwave generation and emission system to realize synchronous measurement of local density fluctuation and magnetic fluctuation at a plurality of positions in the fusion device; a reference source with an adjustable frequency is used for mixing with received multi-channel scattered signals, and a target frequency point needing to be measured is selected according to experimental requirements. According to the system, the problems of local density fluctuation and magnetic fluctuation of multiple positions in the fusion device can be synchronously measured, and meanwhile, the problem of non-uniform power distribution among frequency peak values in a comb spectrum generator scheme is solved.

The invention belongs to the technical field of antennas, and discloses a reflection unit based on a metasurface and an array antenna thereof. Comprising a linear polarization horn antenna feed source and a metasurface reflection array. The array is composed of reflection units which are arranged periodically, and each reflection unit comprises a metal resonance layer, a dielectric substrate and a metal back plate from top to bottom. The metal resonance layer comprises a non-uniform line width structure formed by a central metal strip and two symmetrically connected arc-shaped metal arms, namely, the line width of the central metal strip is unequal to that of the arc-shaped metal arms, so that the loss of the reflection unit is effectively reduced, and coupling between amplitude and phase regulation is remarkably reduced. The reflection phase of the reflection unit is realized by adjusting the central angle corresponding to the arc-shaped arm, and the reflection amplitude is realized by adjusting the rotation angle of the whole metal resonance layer around the normal axis of the metal resonance layer. Through joint optimization of parameters and array arrangement of each unit, excellent performance of low sidelobe level, low cross polarization level and high aperture efficiency is finally realized.

The invention discloses a dual polarization-based terahertz broadband polarization converter metasurface, which is an efficient terahertz wave linear polarization converter based on a square bracket-shaped metal patch unit structure array, and is formed by adding a pair of orthogonal metal gratings on the upper side and the lower side of the square bracket-shaped metal patch unit structure array. According to the invention, the orthogonal metal grating and the square bracket-shaped metal patch form a Fabry-Perot cavity, so that cross polarization reflection and co-polarization transmission can be effectively prevented, and the transmission of cross polarization waves is remarkably increased. The amplitude coding metasurface is constructed by changing the amplitude and utilizing the transmission characteristics of incidence of different linear polarization waves. Under the incidence of linear polarization terahertz waves, a dual-polarization space imaging function is realized. The designed metasurface shows the characteristics of ultra wide band and high transmission efficiency, and has potential application value in the field of wireless communication.

The invention discloses a millimeter-wave broadband high-gain low-cross polarization cavity-backed patch array antenna, which comprises a top antenna layer, a substrate integrated waveguide (SIW) cavity power divider layer and a bottom broadband feed network layer, and is characterized in that the top antenna layer is composed of a plurality of cavity-backed patch antenna units; each unit comprises an SIW dielectric back cavity and a patch antenna with two small grooves on the edge, a broken groove is added in the middle of the patch antenna to form two split small patch structures, and the patch antenna is grounded through two metal through holes. The SIW cavity power divider layer is composed of a plurality of broadband power dividers and serves as a transition structure of the antenna layer and the feed network layer, and array antenna layout is facilitated. The bottom broadband feed network layer is composed of a plurality of H-shaped sections, is a sixteen-path power divider, is cascaded with an SIW cavity power divider, and feeds the top array antenna. The array antenna structure has a broadband characteristic and a high gain characteristic, inhibits a cross polarization component, and realizes a low cross polarization characteristic.

The present invention discloses a broadband dual-polarized slot hollow waveguide antenna, which includes a radiation slot layer, an H-polarization full-common-feed feeding network, an orthogonal mode separation layer, and a V-polarization full-common-feed feeding network stacked from top to bottom. The V-polarization full-common-feed feeding network adopts a bottom-feed feeding method to excite the radiation slot layer to generate vertically polarized waves. The H-polarization full-common-feed feeding network adopts a side-feed feeding method to cause the radiation slot layer to generate horizontally polarized waves. The orthogonal mode separation layer is designed based on a double-ridge rectangular waveguide cavity. The radiation slot layer is used to generate vertically polarized waves under the excitation of the V-polarization full-common-feed feeding network and horizontally polarized waves under the excitation of the H-polarization full-common-feed feeding network, and synthesize the vertically polarized waves and the horizontally polarized waves into cross-polarized waves and radiate them into free space. The advantages are that while having a relatively wide impedance bandwidth, the grating lobe level will not deteriorate significantly, and it has a high antenna efficiency and a high cross-polarization (XPD).

The invention discloses a broadband / high gain / high isolation / low cross polarization dual polarized antenna for millimeter wave communication. The antenna is formed by combining and fastening three layers of dielectric plates through screws, and double surfaces of each layer of dielectric plate are coated with copper. From top to bottom, the first dielectric plate is provided with a square substrate integrated cavity (SIC) enclosed by metal through holes, a first metal layer is etched along the range of the SIC to form an open aperture for antenna radiation, and meanwhile, a windmill type metal patch is loaded at the central position of the aperture surface to maintain an internal electric field of the SIC to be in a TM mode in a working frequency band; the symmetrical structure provides a dual-polarization radiation condition. And meanwhile, the SIW feed transmission lines are orthogonally arranged, so that the requirement of high isolation between the two input ports can be met.

The invention discloses a broadband multi-polarization multi-beam independent regulation reflective metasurface and a design method thereof, relates to the technical field of electromagnetic metamaterials and artificial electromagnetic surfaces, and aims to solve the problem that a metasurface in the prior art generally only supports single polarization or a fixed beam direction so as to realize independent regulation of a plurality of polarization channels. According to the metasurface provided by the invention, a plurality of metasurface units form a two-dimensional array, each metasurface unit is based on a diagonally symmetrical I-shaped metasurface unit, and independent regulation and control of x polarized waves, y polarized waves, left-hand circularly polarized waves and right-hand circularly polarized waves are realized by calculating a cross polarization reflection phase and a unit rotation angle required by the position of each unit. Through phase distribution optimization design, a plurality of reflection beams with adjustable polarization channel directions can be generated in a broadband at the same time, and the antenna has remarkable advantages in anti-interference capability and system complexity reduction.

The invention discloses satellite-borne dual-channel frequency coherent data transmission equipment suitable for polarization cancellation, and belongs to the field of satellite high-speed data transmission. According to the invention, dual-channel same-frequency polarization multiplexing data transmission is adopted. The satellite end realizes the functions of data coding, modulation, frequency conversion amplification and the like of two paths of signals through the high-speed baseband data processing unit, the radio frequency emission dual-channel unit, the left-handed data transmission antenna and the right-handed data transmission antenna. According to the invention, the carrier frequency and symbol frequency of two paths of signals transmitted by the satellite end data transmission equipment are consistent, the complexity is reduced when the ground carries out cross polarization cancellation processing on the two paths of received signals, and the cross polarization cancellation effect is not influenced by factors such as frequency deviation.