258 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 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.

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.

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.

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 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 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 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.

A dual-resonant antenna device is provided, exhibiting improved impedance bandwidth, cross-polarization, and isolation, and is less susceptible to spurious surface wave excitation. More specifically, at least one antenna element and a resonant structure are provided on a non-conductive substrate, such that at least one continuous conductive sidewall of the resonant structure surrounds the one or more antenna elements, forming a resonant cavity filled with a dielectric material covering the one or more antenna elements. Each antenna element is used to excite a TM mode, while the dielectric material and size of the resonant cavity are selected such that the resonant structure is used to excite a TE mode. In a preferred embodiment, the TM mode is a TM 01 mode, and the TE mode is a TE 111 mode.

The circularly polarized metasurface antenna comprises a metasurface layer, a first dielectric plate layer, a metal floor layer, a second dielectric plate layer and a feed network layer which are sequentially stacked from top to bottom, the metasurface layer comprises a plurality of mutually orthogonal metasurface subunits, each metasurface subunit comprises a plurality of metasurface structures arranged in an array period, and each metasurface structure is provided with a monopole radiation structure; the feed network layer is provided with a plurality of output feed points, and the number of the output feed points is the same as that of the metasurface structures. The output feeding points are connected with probes, and the probes sequentially penetrate through the second dielectric plate layer, the metal floor layer and the first dielectric plate layer until the probes are connected with the input feeding points of the corresponding radiation structures. According to the antenna, each layer adopts a covering laminated design, the structure is compact, the antenna has the characteristics of ultra-wideband circular polarization radiation, high gain and good cross polarization, the dual ultra-wideband characteristics of working and RCS reduction are realized, the RCS reduction bandwidth completely covers the working bandwidth, and effective invisibility in and out of the antenna band is achieved.

The embodiment of the invention provides a horn antenna, and relates to the field of antennas. The horn antenna comprises an antenna body, the antenna body is in a horn shape, the inner side radius and the axial position of the antenna body meet the function relation of index gradual change, and a plurality of annular tables are arranged on the outer periphery of the antenna body at intervals in the axial direction of the antenna body. The horn antenna provided by the invention has the excellent radiation performance of beam equalization, low side lobe, low cross polarization and the like of a traditional inner corrugated horn antenna, but is easier to process and implement at low cost, and can also avoid the problem of breakdown between inner corrugated walls of the traditional corrugated horn antenna during high-power microwave radiation, thereby improving the electromagnetic wave radiation capability.

The invention provides a curved surface polarization torsion reflecting surface and an antenna using the same, and belongs to the technical field of antennas. The curved surface polarization torsion reflection surface comprises a curved surface dielectric plate, and a metal bottom plate and an electromagnetic metasurface which are respectively arranged on the outer side and the inner side of the curved surface dielectric plate; the electromagnetic metasurface is formed by periodically arranging a plurality of single-layer electromagnetic metasurface units. The single-layer metasurface unit with the polarization torsion function is conformal on the curved surface, so that the technical problems that a traditional multi-layer planar polarization torsion structure is complex to process, curved surface conformal is difficult, and the performance is deteriorated after conformal are solved. The reflecting surface is preferably a paraboloid, so that the incident wave polarization torsion is realized, and the spherical wave can be converted into the plane wave to improve the antenna gain. The metasurface unit keeps good cross polarization reflection performance within the wide incidence angle range of 0-40 degrees, is suitable for curved surface conformal design, can be integrally formed through 3D printing, and is easy and convenient to machine and stable in performance.

This application proposes a method, apparatus, storage medium, and terminal device for controlling a fully polarized antenna. Based on a first primary polarization level, a first cross-polarization level, a second primary polarization level, a second cross-polarization level, and a target polarization, the coefficient relationship between the first and second polarizations is determined. The first primary polarization level is the primary polarization level of the first polarization, the first cross-polarization level is the cross-polarization level of the first polarization, the second primary polarization level is the primary polarization level of the second polarization, and the second cross-polarization level is the cross-polarization level of the second polarization. In determining the coefficient relationship, in addition to considering the first and second primary polarization levels, the first and second cross-polarization levels are also fully considered. By adjusting the phase difference and amplitude ratio between the first and second polarizations, the coefficient relationship is adapted, which can avoid cross-polarization deterioration while achieving target polarization fitting, thus ensuring the antenna's cross-polarization performance.

The invention provides a metal patch loaded miniaturized dielectric resonator antenna for a base station, and relates to the technical field of wireless communication, a specific parasitic metal patch is introduced at the bottom of a dielectric resonator, the limitation that the traditional design only depends on geometric dimension to adjust the frequency is broken through, the TM12 high-order mode frequency is obviously pulled down to be close to a fundamental mode TM10 and fusion is realized, and the antenna has the advantages of being simple in structure and convenient to use. On the premise that the size of the antenna is not increased, the working bandwidth is expanded to 3.4-4.0 GHz. Through the structural design, a cross-shaped groove structure is loaded in the central area of the dielectric resonator, a current path of a TM20 parasitic mode is cut off accurately, directional diagram distortion and cross polarization interference caused by the mode are effectively suppressed, and it is ensured that the antenna has stable radiation performance. Therefore, the antenna has excellent broadband and radiation characteristics, can still keep compact physical size, low profile structure and simple processing technology, and meets the urgent demand of a microwave frequency band wireless communication terminal on high performance and miniaturization antennas.

The invention discloses a zero-order-eliminating large-point projector based on a polarization conversion metasurface and a design method thereof, and belongs to the field of optical devices. The zero-order-eliminating large-point projector comprises a linear polarization VCSEL dot matrix light source and a metasurface diffraction device; the metasurface diffraction device comprises a two-in-one metasurface structure layer and a linear polaroid layer. The two-in-one metasurface structure layer collimates and splits incident dot matrix light beams generated by the linear polarization VCSEL dot matrix light source at the same time through superposition collimation phase distribution and Dammann light splitting phase distribution, and large-point copying and splicing of the incident dot matrix light beams in a far field are achieved. The linear polaroid layer carries out cross polarization modulation on light beams, so that the polarization states of modulated light and incident light are orthogonal, zero-order light which is not modulated is filtered out, and therefore the problem that a large-point-number two-in-one projector is seriously affected by zero order is solved. The system is compact in structure and low in installation and adjustment cost, interference of zero-order light is inhibited in principle, and the system is suitable for meeting the requirements of thousands to tens of thousands of speckle spots required by the market.

The application discloses an antenna pair with high isolation and low cross polarization level, which comprises a first radiation patch and a second radiation patch arranged as two half-circle ring structures, and the first radiation patch and the second radiation patch are connected through a first branch and a second branch; the first radiation patch and the second radiation patch work in a full-wave mode; the first branch and the second branch are arranged to overlap the resonant frequencies under differential and common mode excitation of two feed ports, and good matching is ensured, so that the isolation of the first radiation patch and the second radiation patch in the band is effectively improved; through the above arrangement, the mode Q value under differential and common mode excitation is close to the same, and the first radiation patch and the second radiation patch can further have high isolation in a wider frequency range. In addition, by introducing a first short pin group and a second short pin group, the polarization current in the x-axis direction can be effectively weakened, and the cross polarization level is reduced.

The application discloses a dual-polarized microstrip patch antenna applied to a millimeter wave phased array, and belongs to the field of radio frequency front ends.The antenna mainly comprises two substrates and two patch structures, wherein the top patch is fed by two coaxial probes, the feeding port has two feeding slits, and the bottom patch is in a cross shape, which increases the cross-polarization ratio of the dual-polarized antenna radiation.The antenna realizes the dual-polarized characteristic at H plane + / -45 DEG, the 10dB relative bandwidth is 38.9%, and the radiation pattern half-power beam width is greater than 100 DEG. The antenna has the characteristics of simple structure and simple manufacturing, and can be rapidly printed and manufactured by adopting a planar microstrip structure.

The invention discloses a wide-angle-domain polarization conversion metasurface with an ultra-wideband characteristic and electronic equipment, the wide-angle-domain polarization conversion metasurface with the ultra-wideband characteristic is formed by periodically arranging a plurality of polarization conversion metasurface units, each polarization conversion metasurface unit comprises two dielectric plate layers and three metal layers, the three metal layers are arranged to be a top-layer metasurface, a middle-layer metasurface and a bottom-layer metal floor from top to bottom, the two dielectric plate layers are arranged among the three metal layers at intervals, and two metal holes are formed in the longitudinal central axis of a metal strip of the top-layer metasurface. And each metal hole penetrates through the upper-layer dielectric plate and is in short circuit with the two rectangular metal patches in the middle of the middle-layer metasurface to form a magnetic resonator. Efficient cross polarization conversion can be achieved within the ultra-wideband range of 9.79-20.62 GHz, the polarization conversion rate is always kept to be 0.9 or above within the wide angular domain of 0-42 degrees, and the ultra-wideband high-polarization-conversion-efficiency ultra-wideband antenna has the advantages of being ultra-wideband, high in polarization conversion efficiency and stable in wide angular domain performance.

The invention discloses a polarization cancellation network for improving polarization isolation of a dual-polarized antenna and a design method thereof, and belongs to the technical field of polarization multiplexing wireless communication systems. A small part of signals are coupled to a cross polarization channel through a coupling method, the purpose of polarization cancellation is achieved by controlling the amplitude and phase of the coupled signals, and the polarization cancellation method is effective not only in the axial phase of the antenna, but also in the wide angle range deviating from the axial direction. Meanwhile, the method is suitable for various forms of dual-polarized antennas, the polarization cancellation network is simple in structure and convenient to process, and the method is a very effective method for improving the polarization isolation of the dual-polarized antenna.

The invention provides a novel low-profile broadband dual-polarization base station antenna, and mainly solves the problems that a base station antenna is large in size and narrow in coverage bandwidth. According to the scheme, the antenna comprises four parts, namely a metasurface, a radiator, a feed network and a reflector, the metasurface is of a uniform annular structure formed by printed microstrip lines, and the radiator is of an orthogonal dual-polarization patch structure. The feed network is a coaxial line penetrating through the ground plane of the reflector, and inner and outer conductors of the feed network are respectively connected with two arms of the dipole; the reflector comprises a reflecting ground and a zigzag reflecting wall; compared with a traditional low-profile dual-polarization base station antenna, the low-profile dual-polarization base station antenna is simple in structure, not only reduces the profile height, but also reduces the area of the ground plane, achieves high port isolation, low back lobe and low cross polarization in a working frequency band, and has wide application value in base station design.