92 results about "Axial ratio bandwidth" patented technology

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The invention discloses a low-profile and high-integration broadband dual-circularly-polarized transceiving common-aperture phased-array antenna, which adopts a multi-layer PCB (Printed Circuit Board) laminated structure, comprises a radiation patch layer, a quasi-rectangular patch layer, a metal reflection ground layer and a feed layer from top to bottom, and is combined with a metalized blind hole and a buried hole to form a complete coupling path. A U-shaped groove, a U-shaped metal strip and a C-shaped groove are integrated on a metal reflection ground, and a staggered groove is loaded on a quasi-rectangular patch, so that a K / Ka dual-band separated dual-coupled feed structure is realized, and dual circularly polarized radiation is obtained under the same aperture. The antenna is further provided with outer ring and inner ring plated-through hole arrays, the outer ring plated-through hole arrays are used for constructing an isolation area to improve the isolation degree between wavebands, and the inner ring plated-through hole arrays introduce a horizontal electric field component to improve the circular polarization purity and expand the axial ratio bandwidth. Wide impedance bandwidth and wide axial ratio bandwidth are realized in the K wave band and the Ka wave band, the isolation degree is high, the profile is low, the structure is compact, and the broadband phased array antenna is suitable for broadband phased array systems such as satellite communication terminals and mobile platforms.

The invention discloses a broadband circularly polarized magnetoelectric dipole antenna with superposed Ka-band radiation modes, and belongs to the field of radio frequency front-end devices. The antenna is composed of an electric dipole patch composed of a rectangular patch and a stepped patch, a magnetic dipole radiator composed of four metal columns, an H-shaped slotted coupling floor, a feeder line, coaxial feed metal columns, an SIW structure, a metal ground backboard, an upper dielectric substrate, a lower dielectric substrate and a pp bonding layer, an antenna unit is subjected to 4 * 4 arraying, and the circularly polarized radiation performance of the antenna unit is verified. According to the invention, the circularly polarized wave beam range is wide, and the axial ratio bandwidth is 3GHz to cover the complete working frequency band. After the array is formed, the active S parameters of the array elements are well matched, and the excellent axial ratio performance is still achieved during beam scanning.

The invention, which relates to the technical field of modern communication, discloses a metasurface-based high-gain low-profile dual-circularly polarized antenna comprising a first dielectric plate, a second dielectric plate arranged below the first dielectric plate, and a metasurface structure arranged above the first dielectric plate. Three rows and three columns of periodically arranged metasurface structures are arranged above the first dielectric plate, a multi-level cooperative working mechanism is constructed by combining 45-degree symmetrical composite gaps etched in a layer indirect floor and a microstrip feeder line which is orthogonally arranged on the lower layer, and the metasurface array realizes high-gain radiation by regulating and controlling the phase of electromagnetic waves. The composite slot structure efficiently converts microstrip line energy into an orthogonal degenerate mode through non-contact coupling, circular polarization purity is guaranteed, the axial ratio bandwidth is expanded to 24.2%, an orthogonal microstrip feeder line forms a 90-degree phase difference through accurately controlled size, high isolation and stable standing-wave ratio of double ports are guaranteed, and the antenna has a wide application prospect. And finally, dual-circular-polarization independent radiation is realized in a 5mm low-profile structure.

The invention provides a wide-axial-ratio circularly polarized antenna based on a four-feed annular dipole, and relates to the technical field of antennas. Comprising a bottom dielectric plate, and a feed network is printed on the upper surface of the bottom dielectric plate; the isolation plate is positioned above the bottom dielectric plate; the top dielectric plate is located above the isolation plate, and a coaxial cable is arranged between the top dielectric plate and the isolation plate; a radiation patch is printed on the lower surface of the top dielectric plate, four metal patches are printed on the upper surface of the top dielectric plate, and the radiation patch is formed by surrounding four fan-shaped patches; the metal sheet covers the central position above the top dielectric plate; the metal ring is arranged outside the bottom dielectric plate and the top dielectric plate in a covering mode, the isolation plate, the coaxial cable, the radiation patch, the metal patch and the feed network are wrapped in the metal ring, and the technical problems that in the prior art, the axial ratio bandwidth of an antenna is narrow, and the 3dB axial ratio beam width is not large enough are solved.

The invention provides a filtering circularly polarized antenna with a wide axial ratio bandwidth. The filtering circularly polarized antenna comprises a first dielectric plate, a second dielectric plate, a third dielectric plate and a fourth dielectric plate which are sequentially arranged in parallel from bottom to top, a metal reflecting plate is printed on the lower surface of the first dielectric plate; a feed network is printed on the lower surface of the second dielectric plate, a slotted metal ground is printed on the upper surface of the second dielectric plate, a feed port is formed in one side edge of the second dielectric plate, and the feed port is electrically connected with the feed network and the slotted metal ground; a second square patch and an octagonal parasitic microstrip line frame are printed on the upper surface of the third dielectric plate, and the octagonal parasitic microstrip line frame surrounds the outer side of the second square patch; and a first square patch is printed on the lower surface of the fourth dielectric plate. Through an interlayer coupling collaborative design, 2.3-5.0 GHz broadband circular polarization radiation and high gain characteristics are realized, and the antenna also has high out-of-band rejection capability and can effectively filter out-of-band clutter interference.

The invention provides an antenna unit and an antenna array, belongs to the technical field of antennas, and aims to broaden the impedance bandwidth and the axial ratio bandwidth of the antenna unit, the antenna unit comprises: a feed structure comprising a metal element for feeding; the radiation structure is coupled with the feed structure and comprises a radiation patch, and the radiation patch comprises a target point; wherein the radiation patch comprises at least one circle of slit pattern surrounding the target point, the slit pattern comprises a plurality of slits, and the plurality of slits are arranged at intervals along the perimeter direction of the radiation patch; wherein in the normal direction of the radiation patch, the distance between the metal element and the radiation patch is larger than 0 mm and smaller than or equal to 0.01 mm.

This invention discloses a broadband circularly polarized integrated feed transmission array antenna covering the entire Ka-band, comprising an array surface and an integrated feed. The phase center of the integrated feed coincides with the focal point of the array surface, illuminating the array surface perpendicularly and forming a 45-degree angle with the array surface in the horizontal direction. The array surface comprises multiple array elements of different sizes arranged linearly. Each array element includes two orthogonally arranged first and second dielectric substrates, which have the same height but different thicknesses. The integrated feed comprises a stacked first and second PCB board. A substrate integrated waveguide is disposed on the first PCB board with coupling slots, and a substrate integrated waveguide cavity and annular metal patches surrounding the substrate integrated waveguide cavity are disposed on the second PCB board. This invention achieves a wide axial ratio bandwidth and gain bandwidth, and has the advantages of low profile, light weight, easy fabrication, and low cost.

The application discloses a circularly polarized logarithmic-periodic antenna based on rotation of radiating oscillators, and belongs to the technical field of antenna engineering, and aims at solving the problem of how to design a circularly polarized logarithmic-periodic antenna with wide bandwidth, low profile and simple structure. The application forms corresponding circularly polarized characteristics by rotating a plurality of groups of radiating oscillators by a certain angle with parallel assembly lines as the shaft. The antenna only has a plurality of radiating oscillators which change according to the logarithmic-periodic antenna rule, and does not have a main oscillator and a sub-oscillator, so that the structure is simpler and easier to realize. Meanwhile, the circularly polarized effect is formed by rotating the radiating oscillators to a certain phase and the phase difference between the electromagnetic waves of each oscillator and the zero point of the antenna, so that the logarithmic-periodic antenna can obtain good impedance bandwidth and 3dB axial ratio bandwidth in the working frequency band.

A single-feed broadband circularly polarized patch antenna for navigation provided by the present invention comprises a first dielectric plate, a second dielectric plate, a third dielectric plate, a metal shielding box and a coaxial cable; an antenna radiator is printed on the first dielectric plate, a coplanar waveguide structure is printed on the second dielectric plate, and a feeding structure is printed on the third dielectric plate; the coaxial cable feeds power to the coplanar waveguide structure on the second dielectric plate through the feeding structure on the third dielectric plate; and the coplanar waveguide structure on the second dielectric plate couples and feeds power to the antenna radiator on the first dielectric plate. The present invention combines a coplanar waveguide structure with a patch antenna, and through a coplanar waveguide coupling feeding technique, successfully improves the axial ratio bandwidth of the single-feed circularly polarized antenna, doubles the maximum operating bandwidth of the single-feed circularly polarized antenna, solves the problem that it is difficult to apply the single-feed circularly polarized antenna with a narrow bandwidth to satellite navigation, and has extremely high applicability and flexibility in the satellite navigation applications of multiple systems and multiple frequency bands.

The invention relates to the technical field of antennas, in particular to a circular polarization patch antenna with a wide axial ratio bandwidth. The antenna comprises a patch, a grounding plate, parasitic units and a reactance load structure, the grounding plate is located at the lowest layer of the whole antenna, the patch and the parasitic units are arranged above the grounding plate at intervals, the parasitic units are arranged near the patch, coupling gaps are arranged between the parasitic units and the patch at intervals, and the reactance load structure is connected to the parasitic units. The reactance load structure adopts one or more combinations of the following structural forms: a capacitive element combined connection conductor, an extension branch knot and a short circuit column. According to the circularly polarized patch antenna with the wide axial ratio bandwidth, the parasitic unit regulated and controlled by the load is arranged beside the main radiation patch, so that the problems of narrow axial ratio bandwidth, complicated structure or high cost of a circularly polarized antenna in the prior art are effectively solved.

The application discloses a kind of super surface circularly polarized antennas, belong to wireless communication technical field, including: super surface, super surface includes a plurality of first super surface units and a plurality of second super surface units arranged in array, first super surface unit is located in the periphery of second super surface unit, and second super surface unit is the symmetrical structure formed by cutting first super surface unit;Dielectric substrate, dielectric substrate includes upper layer dielectric substrate and lower layer dielectric substrate;Driving patch, driving patch is located between upper layer dielectric substrate and lower layer dielectric substrate;Metal floor, metal bottom plate is arranged on the lower surface of lower layer dielectric substrate;Microstrip feed structure, through coupling gap and driving patch non-contact coupling;By unit array optimization, phase difference is generated in orthogonal radiation mode, and circularly polarized radiation is realized.50 ohm microstrip line feeding is used, and non-contact coupling excitation is realized by coupling gap and driving patch;Synergistic design realizes 31.5% impedance bandwidth, 20.4% axial ratio bandwidth, and full coverage WBAN5.15-5.825GHz frequency band.

The present invention discloses a ultra-wideband compact circularly polarized antenna based on a miniaturized phase shifter, belonging to the technical field of antenna engineering. The antenna of the present invention adopts the form of cascading a feeding network and a Vivaldi antenna, and has the characteristic of wide bandwidth; the broadband matching characteristic is realized by designing forms such as a metal coupling sheet, a serrated structure, and a Γ-shaped balun; a novel miniaturized ultra-wideband 90-degree phase shifter is designed by adopting a Π network and a negative group delay circuit; both the Vivaldi antenna layer and the feeding network layer adopt the PCB process, which is easy to process and has low cost. Compared with the traditional phase shifter, a 75% size reduction is achieved, and its size is 67mm * 44.5mm (0.071λ l * 0.047λ l ). At the same time, the simulation results show that the proposed circularly polarized antenna has a 10 dB impedance bandwidth of 0.32 - 1.2 GHz (3.75:1) and a 3 dB axial ratio bandwidth of 0.32 - 1.15 GHz (3.59:1).

This invention relates to the field of phased array antenna technology, specifically disclosing a low-profile broadband circularly polarized phased array antenna element, antenna array, and fabrication method. The antenna includes a body and interconnected feed layers disposed at the bottom of the body. The body comprises, from top to bottom, a parasitic patch, a first dielectric layer, a radiating patch, and a second dielectric layer. A metallized via, coaxial with the body and interconnected with the radiating patch, is disposed on the second dielectric layer. The feed layer is interconnected with the metallized via. A U-shaped slot is disposed on the radiating patch. The metallized via is located within the U-shaped region formed by the U-shaped slot. Compared with the traditional eccentric feeding method, this invention reduces the antenna profile height, lowers fabrication costs, broadens the impedance bandwidth and axial ratio bandwidth, and optimizes the antenna's axial ratio performance.

This invention discloses a dual-substrate circularly polarized reconfigurable omnidirectional antenna based on PIN diode control. The antenna comprises a first substrate and a second substrate. The second substrate has a ground plane printed on it, and the first substrate has a radiating patch printed on it. The radiating patch includes a central square patch, a Γ-shaped stub, a loop antenna, PIN diodes, and via shorting posts. Seamless switching between left-hand and right-hand circular polarization is achieved through the on / off combinations of 16 PIN diodes, with a simple switching logic. High polarization purity is achieved in both polarization modes, and the via shorting posts effectively reduce mutual interference between modes, resulting in strong switching reliability. In both circular polarization modes, the relative impedance bandwidth and axial ratio bandwidth are wide. In the left-hand circular polarization mode, the relative impedance bandwidth reaches 19.38%, covering 2.33-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 26.3%, covering 2.08-2.71GHz with AR<3dB. In the right-hand circular polarization mode, the relative impedance bandwidth reaches 19.8%, covering 2.32-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 23.43%, covering 2.11-2.67GHz with AR<3dB, which is significantly better than existing narrowband designs of the same type.

The invention provides a broadband wide-axial-ratio circularly polarized antenna based on a tight coupling principle, and relates to the technical field of microstrip antenna structure design, the broadband wide-axial-ratio circularly polarized antenna comprises a first dielectric plate as a substrate, and a feed network capable of realizing one-to-four power division and 90-degree phase shift is printed on the lower bottom surface of the first dielectric plate; a second dielectric plate is arranged above the first dielectric plate in parallel, four arc-shaped metal patches are arranged on the lower bottom surface of the second dielectric plate to form a radiation unit, and the adjacent patches are tightly coupled through an interdigital capacitor; and a strip-shaped microstrip line is arranged on the upper top surface of the second dielectric plate. And the four coaxial feeder lines are vertically connected with the output end of the feed network and each metal patch, so that high-efficiency transmission of signals is realized. The upper surface of the first dielectric plate is provided with an annular metal cavity which is connected with the metal ground and is used for improving the axial ratio at a low elevation angle. According to the invention, wide impedance bandwidth and wide axial ratio bandwidth are realized, and the antenna has wide axial ratio beam width and high radiation efficiency.

The utility model discloses a dual-frequency circularly polarized combined antenna, which comprises a metal reflecting plate, a high-frequency circularly polarized radiation unit and a low-frequency wide-beam radiation unit, the high-frequency circularly polarized radiation unit and the low-frequency wide-beam radiation unit share the same reflecting plate, and the high-frequency circularly polarized radiation unit is positioned above the low-frequency wide-beam radiation unit. According to the utility model, the embedded orthogonal dipole pair is adopted, so that the high-frequency-band axial ratio bandwidth breaks through the limitation of the traditional single-feed microstrip antenna, the relative bandwidth with the actually measured axial ratio less than or equal to 3dB reaches 18.7%, and the Beidou third-generation B1C / B2a frequency band requirement can be completely covered. The nickel-chromium alloy films evaporated on the upper and lower surfaces of the dielectric plate effectively inhibit interlayer crosstalk, the cross polarization ratio is improved to be greater than 15dB, and the dual-band radiation purity is ensured.

The invention relates to the technical field of antennas, in particular to a miniaturized low-profile circularly polarized microstrip antenna with double axial ratio points. A circular radiation patch unit is adopted, and the circular radiation patch unit comprises a cross dipole, a rectangular feed strip, a fan-shaped NFRP unit and an L-shaped NFRP radiation unit. The cross dipole patch is symmetrical along the X axis on the whole and is formed by crossing a pair of printed dipoles of which the tail ends are of fan-shaped structures, metal short circuit columns are loaded at the tail ends of the fan-shaped structures so as to realize the miniaturization of the antenna size, the coaxial feed structure feeds a rectangular strip extending from the cross dipoles in the + X axis direction, and the Left-hand polarization (LHCP) of the antenna is realized. The NFRP patch comprises a fan-shaped NFRP patch and two L-shaped NFRP patches, the fan-shaped NFRP patch is embedded in the-X axis direction of the crossed dipole, and a new resonance mode is introduced for the antenna so as to generate a second axial ratio point; the two L-shaped NFRP patches are respectively embedded in the-Y-axis direction and the + Y-axis direction of the crossed dipole and are used for reducing the frequency division ratio of two axial ratio points, and at the moment, the axial ratio bandwidth of the original crossed dipole circularly polarized antenna is effectively expanded.

The application discloses a planar dual-circularly polarized antenna based on a quadrature magnetic dipole, and relates to the technical field of dual-circularly polarized antennas. The antenna comprises a first dielectric substrate, a metal ground layer, a second dielectric substrate and a third dielectric substrate which are stacked from top to bottom. The metal ground layer is provided with a first coupling slot and a second coupling slot in the middle. The first dielectric substrate is provided with two first metallized through holes and two second metallized through holes. A first metal strip is connected with the metal ground layer through the two first metallized through holes, and the two first metallized through holes are rotationally symmetrical about the first coupling slot. The position relationship between the second metallized through hole and the second coupling slot is the same as the position relationship between the second metallized through hole and the second coupling slot. The coupling slots and the microstrip feed line are coupled to excite the metallized through holes and the metal strip, and generate right-handed circularly polarized radiation waves or left-handed circularly polarized radiation waves in the direction upwards. The application has the performance advantages of low profile, simple structure and wide axial ratio bandwidth.

The invention discloses a millimeter wave dual-circular polarization multi-beam antenna based on a polarization grating lens. The millimeter wave dual-circular polarization multi-beam antenna comprises a dielectric polarization grating lens and a millimeter wave + / -45-degree dual-linear polarization antenna array. According to the multi-beam antenna, a + / -45-degree dual-line polarization planar antenna array is used as a feed source and is placed on a horizontal focal plane of a dielectric polarization grating lens, and dual-circular polarization beam scanning is realized by exciting different ports of the feed source array. Each perforated column in each layer of the dielectric polarization grating lens has dielectric constants in radial gradient distribution and anisotropy in horizontal and vertical directions, and can convert + / -45-degree dual-linear polarization into dual-circular polarization while converting spherical waves into plane waves to improve antenna gain. The planar lens and the polarization grid structure are integrated, the system size is effectively reduced, + / -50-degree dual circular polarization beam scanning is achieved, the axial ratio bandwidth reaches 21.8% (24.5-30.5 GHz), and the maximum gain reaches 19.2 dBic.

The invention relates to the technical field of wireless, and provides a cavity-backed circularly polarized antenna. The cavity-backed circularly polarized antenna comprises a resonant cavity, the top layer of the resonant cavity is etched with a radiation structure, and the radiation structure is used for generating an inherent circularly polarized resonance point; at least one resonant structure is arranged in the resonant cavity, the at least one resonant structure is used for generating an additional circularly polarized resonant point, and the at least one resonant structure is electromagnetically coupled with the radiation structure, so that the inherent circularly polarized resonant point and the additional circularly polarized resonant point interact to widen the circularly polarized bandwidth. According to the invention, the axial ratio bandwidth is effectively expanded so as to meet the requirements of a modern broadband communication system.

The antenna is of a layered structure and comprises a first dielectric substrate and a second dielectric substrate which are arranged in parallel, an air layer is arranged between the first dielectric substrate and the second dielectric substrate, a rectangular parasitic metal patch is arranged on the upper surface of the first dielectric substrate, and the rectangular parasitic metal patch is arranged on the lower surface of the second dielectric substrate. Each rectangular parasitic metal patch is connected with a continuously bent metal stub line; a rectangular driving metal patch is arranged on the upper surface of the second dielectric substrate, and a metal ground is arranged on the lower surface of the second dielectric substrate. The wide axial ratio bandwidth and circular polarization self-decoupling of the laminated microstrip patch antenna can be realized without an additional decoupling structure or circuit, and the antenna has the characteristics of simple structure, wide axial ratio bandwidth, self-decoupling, multi-antenna expansion, easy integration and the like, and is suitable for satellite communication, global positioning system, mobile communication and the like.

The application discloses a heart-shaped broadband circularly polarized patch antenna, which comprises a dielectric substrate, a heart-shaped radiation patch, a microstrip feed line and a ground plate. A characteristic mode analysis method suitable for irregular geometric shapes is proposed, that is, a plurality of non-orthogonal characteristic modes are used to realize a broadband circularly polarized antenna. The application has the advantages of simple structure, beauty, compactness, simple feed mode, wide impedance and axial ratio bandwidth, and stable radiation pattern. The new method has clear physical mechanism, simple steps and wide application prospect.

The invention discloses a low-profile broadband circularly polarized array antenna based on traveling wave slot coupling feeding. The array adopts a multi-layer structure and comprises a feed microstrip line layer, a first dielectric substrate, a metal plate with a cross recess, second to fifth dielectric substrate layers, a first metal sheet layer and a second metal sheet layer from top to bottom. The feed network realizes energy equal-amplitude in-phase and unequal-phase transmission through the first-stage T-shaped microstrip line and the second-stage unequal-length T-shaped microstrip line. The cross recess on the metal plate and the metalized through hole in the dielectric substrate work cooperatively to guide electromagnetic waves to radiate upwards and suppress transverse loss. The multiple layers of dielectric plates and the metal sheets are mixed and stacked and are arranged in a sequential rotation mode, so that the impedance bandwidth and the axial ratio bandwidth are effectively widened, and the antenna gain is improved. The antenna realizes the characteristics of high gain, wide bandwidth and low profile of 0.056 working wavelength under the center frequency of 7GHz.

The application discloses a method for improving the bandwidth and efficiency of a 1bit circularly polarized transmission array antenna, which comprises the following steps: rotating the radiation patch of a 1bit circularly polarized phase encoding transmission unit by 90 degrees to form a type of unit which is orthogonally arranged with the radiation layer of the original transmission unit; cross-distributing the original transmission unit and the orthogonal unit to form a 2*2 structure block; exchanging the positions of the original unit and the orthogonal unit in the 2*2 structure block to form a 2*2 permutation structure block; cross-distributing the original structure block and the permutation structure block to form a 4*4 unit supercell; the radiation layer distribution pattern of the 4*4 unit supercell is approximately the order rotation of 4 2*2 structure blocks at 0 degrees, 90 degrees, 180 degrees and 270 degrees; and the 4*4 unit supercell is used to construct a 1bit circularly polarized transmission array antenna. The application solves the strong correlation of the main polarization and cross-polarization phase control in the uniform array, and improves the axial ratio bandwidth of the circularly polarized beam and the aperture efficiency of the array antenna.

The application discloses a broadband circularly polarized magneto-electric dipole antenna for 5G communication. The antenna comprises an upper layer metal patch, an upper layer dielectric substrate, a middle layer metal patch, a lower layer dielectric substrate and a lower layer metal patch; the upper layer metal patch comprises two pairs of metal sheets, each metal sheet is provided with a group of metal through holes, penetrates through the upper layer dielectric substrate to connect the upper layer and the middle layer metal patch, one pair of rectangular metal sheets is etched with rectangular corners and metal through holes to realize circular polarization characteristics, and the other pair of rectangular metal sheets is etched with triangular corners and increased inclined elliptical metal patches to expand the axial ratio bandwidth; the middle layer metal patch is laid on the upper surface of the entire lower layer dielectric substrate and etched with a rectangular gap; the lower layer metal patch is composed of three different rectangulars to form a stepped microstrip transmission line, and in combination with the rectangular gap, the antenna is more compact, and the radiation direction is more concentrated. The antenna has the advantages of wide working frequency band, wide axial ratio bandwidth, high and stable gain and application in a 5G communication system.

The invention discloses a metasurface near-field loaded dual circularly polarized phased array, which comprises M * N antenna units which are uniformly distributed according to M rows and N columns to form an antenna array, each antenna unit comprises a circular polarizer, a radiator, a feed network, a grounding layer and a reflecting layer, the radiator comprises two linear dipoles and a metal matching patch structure, and the metal matching patch structure is arranged between the two linear dipoles. The two linear dipoles respectively form an included angle of 45 degrees and an included angle of-45 degrees with the row direction of the antenna array, and are respectively connected with the grounding layer through a plurality of short circuit columns, and the metal matching patch structure sets the equivalent impedance of the radiator; the circular polarizer is realized by adopting a linear circular polarization converter based on a frequency selective surface, is positioned in a near field of the radiator and radiates right-handed circular polarized waves to a reflecting layer and a free space, and the reflecting layer reflects one part of left-handed circular polarized waves or right-handed circular polarized waves back to the circular polarizer and transmits the other part of the left-handed circular polarized waves or right-handed circular polarized waves to the free space; the antenna has the advantages of wide axial ratio bandwidth, wide scanning angle, high isolation, low scanning gain drop characteristic and low profile.

The invention discloses an S-band dual-polarization high-temperature-resistant high-gain flatness circularly polarized antenna, and belongs to the technical field of communication. The antenna comprises an all-metal radiator, a metal floor and an antenna housing, the all-metal radiator comprises a circular metal radiation patch with an arc-shaped gap, a metal column and a cross-shaped metal radiation patch; dual-polarization directional circularly-polarized radiation is realized by coaxially feeding power to the circular metal radiation patch under the antenna on the + X axis and the + Y axis, the hexagonal metal columns are used for improving the working frequency band of the whole antenna and providing good mechanical stability, and the topmost cross-shaped metal radiation patch is used for improving the final gain, the working bandwidth and the axial ratio bandwidth. The metal floor is added to the outer layer of the antenna, the antenna housing is added to the upper portion of the radiator, the working performance of the whole antenna is protected, an all-metal structure is adopted, high temperature stability and high gain are ensured, the gain flatness is 0.5 dB, the working frequency band is 2.09 GHz-2. 58 GHz, the axial ratio bandwidth is 2.09 GHz-2. 5 GHz, the profile height is 0.25, and the center frequency wavelength is achieved.

The application discloses an ultra-low profile wideband circularly polarized microstrip patch antenna array and a design method thereof, the antenna array is constructed on a single-layer thin dielectric substrate, the antenna unit is composed of a substrate integrated waveguide resonant cavity and a microstrip patch resonator embedded in the center, and the combination of the double resonators is realized without increasing the size of the antenna. Adjacent antenna units are arranged with zero spacing, and share a metal column around the edge of the substrate integrated waveguide resonant cavity. By using the center slot, the ring slot and the four symmetrical slots connected thereto, two pairs of degenerate modes with orthogonal polarization and similar resonant characteristics are introduced, thereby forming four resonant points with similar radiation characteristics and similar resonant frequencies and two axial ratio zero points, so that the synchronous expansion of the impedance bandwidth and the axial ratio bandwidth is realized. In addition, the radiation cancellation effect along the two sides of the ring slot produces a radiation zero point near the upper edge of the passband, thereby improving the out-of-band suppression performance of the antenna.

This invention discloses a broadband circularly polarized millimeter-wave antenna. It uses a magnetoelectric dipole antenna as a linearly polarized antenna source, satisfying the characteristics of wide impedance bandwidth and stable gain. A polarizer is then used to increase the gain while simultaneously achieving circular polarization. This design eliminates the need for a complex feed network, reducing design complexity, improving efficiency, and providing a wide axial ratio bandwidth. The invention includes a polarizer 1 and a magnetoelectric dipole antenna 2. The polarizer 1 consists of multiple polarization layers, each composed of spaced-apart grating media 11 and air plates 12. Adjacent polarization layers satisfy the following conditions: the grating media 11 and air plates 12 are cuboid structures; the length of the grating media 11 is less than the length of the air plate 12; the upper right corner of the lower grating media 11 is connected to the upper left corner of the upper grating media 11; along the height direction of the grating media 11, the magnetoelectric dipole antenna 2 is separated from the polarizer 1 by a distance g, and is supplied to the antenna sequentially through a rectangular waveguide-to-SIW structure 3 and a flange.