69 results about "Reflective array antenna" patented technology

The invention discloses a low-profile dual-circularly polarized wave beam scanning folding reflection array antenna. The low-profile dual-circularly polarized wave beam scanning folding reflective array antenna comprises a lower reflective array antenna and an upper circularly polarized selection metasurface. A circular polarization plane feed source is integrated in the middle of the reflective array antenna, and beam deflection is achieved. The circular polarization selection metasurface introduces opposite phase gradients to a left-hand circular polarization wave beam and a right-hand circular polarization wave beam through spin decoupling, and then introduces opposite wave beam deflection angles. Meanwhile, due to the polarization selection function of the circular polarization selection metasurface, the profile height of the antenna is half of the focal length of a traditional reflective array. By rotating the lower-layer reflective array antenna and the upper-layer circular polarization selection metasurface, the antenna can realize simultaneous + / -42-degree pitch angle scanning and 360-degree azimuth angle scanning of left-hand circular polarization and right-hand circular polarization dual beams, and the aperture efficiency, the axial ratio, the scanning loss and other performances are good. The low-profile dual-circularly-polarized wave beam scanning folding reflection array antenna provided by the invention can realize simultaneous scanning of two circularly-polarized wave beams, and is low in profile, compact in structure, low in cost and novel in function.

The invention relates to the technical field of antennas, and discloses a reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation, which comprises a control circuit, and a first polarization grid layer, a first dielectric layer, M * N resonant sheets, a second dielectric layer and a second polarization grid layer which are sequentially arranged, the resonance piece comprises a radiation part, a grounding wire, four extension parts and two PIN diodes, the four extension parts are symmetrically arranged on the periphery of the radiation part and are connected with the radiation part, and the two PIN diodes are respectively arranged on two adjacent extension parts and are respectively connected with the upper polarization grid layer and the lower polarization grid layer through bending wires on the extension parts and metal columns in the dielectric layer; one end of the grounding wire is connected with the radiation part, and the other end is connected with direct-current ground; and the control circuit controls the connection and disconnection of the PIN diode through the polarization gate layer to realize a transmission mode or a reflection mode. The reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation is relatively simple in structure, and loss can be reduced.

The invention discloses a reflective array antenna control method and system based on a broadband dual-polarization unit, and the method comprises the steps: obtaining a target wave beam pointing instruction, and carrying out the orthogonal decomposition of the target wave beam pointing instruction into a first polarization control vector and a second polarization control vector; calculating a theoretical phase frequency spectrum of each unit according to the polarization control vector; calling a preset database to extract a basic phase spectrum; quantitative mapping is carried out by calculating a matching error between a theory and a basic phase frequency spectrum, a phase control code containing the first polarization and the second polarization is obtained and loaded to a corresponding broadband dual-polarization unit to drive the switching of a physical state of the broadband dual-polarization unit, and real-time reconstruction of a wave beam is realized. Compared with the prior art, the antenna can overcome the defects that a traditional reflective array antenna is serious in polarization component coupling, low in phase matching degree in a broadband range and inaccurate in phase control code acquisition, and remarkably enhances the independent pointing precision and the full-band gain stability of dual-polarization beams. Therefore, flexible reconstruction of the wave beam in polarization and frequency dimensions is realized.

The invention discloses a broadband and high-efficiency true time delay reflective array antenna, and belongs to the technical field of antenna engineering. Through the design of the broadband horn feed antenna, the broadband butterfly-shaped dipole antenna and the real-time-delay coaxial transmission line, high-efficiency directional radiation is realized. The gain bandwidth of the multi-layer patch type reflective array antenna is much larger than that of a traditional multi-layer patch type reflective array antenna; compared with a traditional transmission line phase modulation type reflective array antenna, due to stable time delay and shielding and no resonant structure, the antenna has better gain stability, and an in-band gain curve is increased approximately linearly. Finally, the antenna is simple in structure and can be realized only by a single-layer patch structure and a common coaxial transmission cable, and high-cost laminated patch processing is not needed.

An antenna includes a supporting layer and a reflection element disposed on the supporting layer configured to reflect an incident wave with a respective reflection phase, the reflection element extending perpendicularly from the supporting layer at a height configured to achieve the respective reflection phase, and both the supporting layer and the reflection element being formed with an all-dielectric material. The antenna is not susceptible to metallic corrosion and has flexible design freedom. It is in a simple and compact structure for providing complete reflection and phase adjustment simultaneously. The simple structure of the antenna enables it to be manufactured in an efficient and cost-effective manner.

The invention belongs to the technical field of antennas, and particularly relates to a low-profile single-layer dual-polarization structure composite array antenna for a C / K wave band. Comprising a dielectric substrate, the lower surface of the dielectric substrate is a metal floor, and m * m composite array elements are integrated on the upper surface; each composite array element comprises a square ring structure and a Jerusalem cross structure arranged in the square ring structure, and the Jerusalem cross structure and the square ring structure are not in contact and coincide in center; all the square ring structures form a C-band array antenna, super units are divided according to n * n, and each super unit is fed through an SMA coaxial line; all the Jerusalem cross structures form a k-band reflective array antenna, super units are divided according to z * z, and each super unit is connected with a horn antenna through a waveguide for coupling radiation; wherein: nlt; zlt, zlt; m, z and n are positive numbers. According to the invention, multiplexing of a C / K wave band antenna structure is realized by using the single-layer dielectric substrate, the height is reduced, the process is simplified, the cost is reduced, the antenna is suitable for a multi-frequency satellite communication system, and large-scale array arrangement can provide high-gain radiation.

The present invention discloses a single-layer broadband reflectarray antenna with independent control of dual-linear polarization. The present invention realizes the x-polarization working state and the y-polarization working state of the reflectarray antenna by rotating the horn antenna 0° and 90° relative to the planar reflectarray; the planar reflectarray includes a plurality of reflective units, each of which includes a dielectric layer, a metal reflective layer and a metal backplane layer; the metal reflective layer includes a metal ring and a cross-shaped metal patch. The present invention realizes independent reflection responses in two directions of the reflective unit through a single degree of freedom, and relies on rotating the feed horn antenna to change the polarization working state of the array antenna. The present invention adopts a single-layer structure without air gaps, achieving low profile, lightweight, simple manufacturing and low cost, and adopts a continuous phase adjustable method. It is the first time to propose a single-layer broadband reflectarray antenna with independent dual-linear polarization and continuous phase adjustment, realizing a lightweight single-layer design while ensuring high aperture efficiency and broadband.

Examples disclosed herein relate to a reflectarray antenna system with two-dimensional beam scanning that includes a first reflectarray having a polarizing grid that operates as a reflective surface in a first polarization and operates as a transparent surface in a second polarization. The reflectarray antenna system includes a second reflectarray comprising an array of reflectarray cells and arranged parallel to the first reflectarray. The second reflectarray includes a first set of feed elements arranged along a first axis and a second set of feed elements arranged along a second axis orthogonal to the first axis to scan a field of view along the first and second axes. The second reflectarray can radiate radio frequency (RE) beams in the first polarization with the first and second sets of feed elements for reflection at the polarizing grid and radiate reflected RE beams in the second polarization for transmission through the polarizing grid.

The invention belongs to the technical field of antenna design, and discloses a broadband reflective array antenna unit, which comprises a metal layer, a dielectric layer and a metal back plate which are sequentially stacked, the metal layer comprises eight arc-shaped metal wires of which the centers are communicated, every two of the eight arc-shaped metal wires form a group, two groups are arranged along a first direction, the other two groups are arranged along a second direction, the two directions are orthogonal, and the two groups of arc-shaped metal wires in each direction are rotationally symmetrical about the communication center; any two metal wires which are rotationally symmetrical about the communication center have equal central angles; and in the eight arc-shaped metal wires, any two adjacent arc-shaped metal wires are staggered by a certain distance along the radius direction and extend in opposite rotating directions. The staggered structure not only avoids overlapping of the metal wires and improves the reflection phase range, but also forms a double-resonance mode, so that broadband linear phase response can be provided, and the designed reflective array antenna unit is simple in structure and easy to process, and can also realize linear-circular polarization conversion.

The present invention relates to the field of wireless communication technologies, and discloses a transmissive and reflective array antenna, which includes a feed source, a dielectric substrate, M×N transmissive units and m×n reflective units thereon; the transmissive unit includes two transmissive layers and two metal vias, the transmissive layer includes a first metal sheet and second metal sheets on both sides thereof, and two ends of the metal via are connected to two first metal sheets; the reflective unit includes a first reflective layer and a second reflective layer, the first reflective layer includes a third metal sheet and fourth metal sheets on both sides thereof, and the second reflective layer is a fifth metal sheet; the feed source can radiate orthogonal first polarization signals and second polarization signals to the side of the dielectric substrate; by adjusting the sizes of the respective metal sheets, the transmissive unit can generate a preset phase shift value for the transmitted electromagnetic wave, and the reflective unit can generate a preset phase shift value for the reflected electromagnetic wave, so that the antenna can achieve two-way communication to expand the signal coverage range and simultaneously form a radiation beam with a desired shape.

The application discloses a shared-aperture metasurface antenna with high isolation, which comprises a horn feed source and a shared-aperture metasurface patch antenna assembly, and the shared-aperture metasurface patch antenna assembly comprises at least one microwave metasurface patch unit, and each microwave metasurface patch unit comprises at least two reflective array units. The shared-aperture metasurface antenna forms the effect of microwave metasurface antenna and millimeter wave reflective array antenna multiplexing on the side close to the horn feed source, the required compensation phase can be obtained by adjusting the size of the reflective array unit, the independent design of the shared-aperture antenna is realized, the high isolation and stable radiation pattern in the microwave and millimeter wave working frequency bands are realized, the antenna has a large frequency ratio of 1:8.57, the ultra-high isolation of more than 100 dB and 40 dB is realized in the low frequency band and the high frequency band respectively, the microwave metasurface and the millimeter wave reflective array effect of the antenna can be integrated on the same layer of the antenna, the antenna structure is compact, and the antenna profile and cost are effectively reduced.

[Problem] The present invention addresses the problem of providing a lightweight and flexible electromagnetic wave reflecting sheet that has folding parts that are highly resistant to deterioration even when repeatedly folded and unfolded, that can be stowed compactly, and that is suitable for use in a deployable reflectarray antenna to be mounted on an artificial satellite. [Solution] In this electromagnetic wave reflecting sheet, a first layer consisting of a fiber base material having a metal pattern formed directly on at least one surface thereof and a second layer consisting of a fiber base material having a metal film formed directly over at least one entire surface thereof are arranged such that the first layer and the second layer face one another, and, furthermore, a reflecting element row is formed from elements comprising the metal pattern in the first layer, and the second layer is used as a ground layer, thereby forming a reflectarray for a deployable antenna.

This invention discloses a dual-band common-aperture conformal transflective array antenna with a high frequency division ratio, belonging to the field of emergency communication. It comprises, from top to bottom, a common-aperture, coplanar integrated dielectric substrate, three shared frequency selective surfaces, and a reflection-transmission coordinated control layer. Each of the three shared frequency selective surfaces includes a central cascaded frequency selective surface and surrounding extended frequency selective surfaces. The reflection-transmission coordinated control layer includes a double-opening ring located at the bottom of the central cascaded frequency selective surface, with its diameter limited by the period of the central cascaded frequency selective surface, and surrounding extended frequency selective control surfaces. Using this dual-band common-aperture conformal transflective array antenna with a high frequency division ratio, independent amplitude and phase control of the two frequency bands at 35GHz and 140GHz, with a 4:1 frequency division ratio, is achieved without mutual interference.

The invention relates to the technical field of wireless communication, and discloses a transmission and reflection unit of an antenna and a transmission and reflection array antenna, the unit comprises a reflection patch, a first substrate, a first gate layer, a second substrate, a transmission patch, a third substrate and a second gate layer which are arranged in sequence; the reflection patch comprises a first I-shaped patch and C-shaped patches which are symmetrically arranged on two sides of the middle part of the first I-shaped patch; the first gate layer and the second gate layer are a plurality of metal strips which are orthogonally arranged; the transmission patch comprises a second I-shaped patch, a square patch and two rectangular patches, the two ends of the second I-shaped patch are arc-shaped, the included angle between the length direction of the second I-shaped patch and the length direction of the first grid layer is 45 degrees, the square patch is arranged in the middle of the second I-shaped patch, and the two rectangular patches are symmetrically arranged on the two sides of the square patch. The reflection phase shift value and the transmission phase shift value of the unit can be adjusted by adjusting the size parameters of the reflection patch and the transmission patch, and the array antenna composed of the unit has the characteristics of wide bandwidth, high gain and multiple modes.

The invention relates to the technical field of antennas, in particular to a design method of a reflective array antenna for realizing multi-beam circular polarization and the reflective array antenna, and the design method comprises the following steps: step 1, extracting irradiation electric field distribution of a feed source antenna (3) on an aperture of the reflective array antenna; 2, based on irradiation electric field distribution and reflection phase distribution of the reflective array antenna, low-sidelobe elliptical beam synthesis is carried out by adopting an adaptive iterative Fourier algorithm, in the iteration process, a beam area of each beam is automatically identified according to an obtained directional diagram, and the beam areas and sidelobe areas are respectively corrected according to constraint conditions; step 3, according to a phase synthesis result, a circular polarization reflection unit (1) corresponding to the synthesized reflection phase distribution is arranged on the reflection array antenna aperture; and step 4, arranging a wave absorbing unit (2) surrounding the circularly polarized reflection unit (1) in the edge area of the aperture of the reflective array antenna.

The application discloses a low-profile full-metal circularly polarized reflective array. The reflective array antenna comprises a circularly polarized horn antenna for feeding, a full-metal circularly polarized reflective array, and a support for fixing the circularly polarized horn antenna and the full-metal circularly polarized reflective array. The circularly polarized reflective array is composed of units with different reflection phases, and the units are adjusted by rotation to form a required radiation beam. The antenna has a full-metal structure, and has certain advantages over a reflective array realized by using a dielectric substrate in application scenarios such as high power and conformal. The antenna has the characteristics of simple structure, low profile, low cost and short design period, and is suitable for satellite communication and radar fields.

The application relates to the technical field of wireless communication, and discloses a transmission-reflection unit of an antenna and a transmission-reflection array antenna, the unit comprising a reflection patch, a first substrate, a first grid layer, a second substrate, a transmission patch, a third substrate and a second grid layer arranged in sequence; the reflection patch comprises a first W-shaped patch and C-shaped patches symmetrically arranged on both sides of the middle part of the first W-shaped patch; the first grid layer and the second grid layer are a plurality of metal strips arranged in an orthogonal mode; the transmission patch comprises a second W-shaped patch, a square patch and two rectangular patches, the two ends of the second W-shaped patch are arc-shaped patches, the length direction of the second W-shaped patch and the length direction of the first grid layer form an included angle of 45 degrees, the square patch is arranged in the middle of the second W-shaped patch, and the two rectangular patches are symmetrically arranged on both sides of the square patch. The size parameters of the reflection patch and the transmission patch can be adjusted to adjust the reflection phase shift value and the transmission phase shift value of the unit, and the array antenna composed of the unit has the characteristics of wide bandwidth, high gain and multiple modes.

An antenna includes a supporting layer and a reflection element disposed on the supporting layer configured to reflect an incident wave with a respective reflection phase, the reflection element extending perpendicularly from the supporting layer at a height configured to achieve the respective reflection phase, and both the supporting layer and the reflection element being formed with an all-dielectric material. The antenna is not susceptible to metallic corrosion and has flexible design freedom. It is in a simple and compact structure for providing complete reflection and phase adjustment simultaneously. The simple structure of the antenna enables it to be manufactured in an efficient and cost-effective manner.

The invention discloses a method for obtaining phase distribution of a plane reflection array antenna based on a multi-target algorithm. The method comprises the following steps: designing a plane reflection array; establishing a near-field electric field calculation model through the parameters of the plane reflection array, and defining a forming target area and a limiting target area; respectively establishing a first target loss function and a second target loss function according to the forming target and the limiting target; an NSGA-III multi-objective optimization algorithm is adopted to carry out optimization solution, a contradictory relation between a forming objective and a limiting objective in a solution set is analyzed based on a Pareto graph, the range of a limiting area is adjusted, and an optimized second objective loss function is obtained; and solving the optimized second target loss function, selecting a Pareto optimal phase distribution scheme in an optimal solution set, designing a reflective array antenna, and verifying a near-field rectangular focal spot generation effect. According to the method, the target is adjusted through a method of improving the loss function, so that a better shaping effect is obtained.

The invention discloses a reconfigurable unit of a paper folding reflective array antenna and an array bias circuit wiring method thereof. The reconfigurable unit sequentially comprises a metal ground, a foam air layer, a polyimide film layer and a metal patch layer from bottom to top, wherein the metal patch layer comprises a first metal patch layer and a second metal patch layer which are distributed at an interval, and a PIN diode is arranged between the first metal patch layer and the second metal patch layer; the first metal patch layer and the second metal patch layer are respectively provided with direct current bias via holes. The reflective array antenna unit based on the polyimide film has the advantages of being simple in structure, low in cost, light in weight, high in folding-unfolding ratio and high in performance, can be well suitable for a satellite-borne paper folding reflective array antenna, and meanwhile brings good wave beam regulation and control performance to the satellite-borne paper folding reflective array antenna.

The invention provides a wide-area wave beam scanning reflective array antenna based on mechanical control. The reflective array antenna is composed of a reflection aperture and a horn antenna feed source. The reflection aperture is formed by arranging reflection units on a plane, and each reflection unit structurally comprises an upper layer dielectric plate, an air gap, a lower layer dielectric plate, a metal ground, an elastic clamping piece and a control rod. The reflection coefficient phase of the reflection unit is regulated and controlled by mechanically controlling the height of the air gap between the upper dielectric plate and the lower dielectric plate, so that beam scanning is realized. The reflection unit has four reconfigurable states, and the position of the upper dielectric plate is fixed, and the position of the lower dielectric plate is controlled by pushing and pulling the control rod, so that the reconfiguration of the reflection unit is realized. By using a 20 * 20 array formed by the reflection units, wide-area beam scanning of + / -60 degrees with the gain greater than 18dBi can be realized, and the gain bandwidth, the directional diagram stability and the like all meet the requirements of super-large-scale MIMO wireless communication.

This invention relates to the field of antenna technology and discloses a method for correcting assembly errors in planar reflective array antennas. It aims to address the problems of existing assembly processes failing to maintain subwavelength-level accuracy, traditional compensation methods being unable to dynamically detect non-uniform deformation and local misalignment, and lacking the ability to jointly model multi-dimensional coupling errors. The method includes: constructing a digital twin model containing the theoretical positions and phase configurations of the reflective elements; acquiring spatial coordinates and radiation field data under the actual assembly state through 3D scanning and near-field measurement; establishing the mapping relationship between element position deviation, angle deflection, beam pointing error, and gain loss; identifying key error patterns and distribution regions using principal component analysis and spatial clustering; calculating the required phase correction for each element and generating a compensation distribution map. This application enables accurate perception, adaptive compensation, and online correction of assembly errors, significantly improving antenna gain, sidelobe suppression capability, and beam pointing accuracy.

The application discloses a reconfigurable transreflective unit, a reconfigurable transreflective array antenna and a vehicle, and relates to the technical field of antennas. The second dielectric substrate in the unit is oppositely arranged with the first dielectric substrate along the X direction. The side, away from the first dielectric substrate, of the second dielectric substrate is provided with a transmissive patch. The side, away from the second dielectric substrate, of the first dielectric substrate is provided with a reflective patch electrically connected with the transmissive patch. Two diodes are arranged on the reflective patch. By controlling the conduction and the cut-off of the two diodes, the reconfigurable transreflective unit can be switched between the reflection mode and the transmission mode. In the reflection mode, the reflective patch is used for reflecting the incident X-polarized electromagnetic wave to the space where the feed source is located. In the transmission mode, the transmissive patch is used for converting the incident X-polarized electromagnetic wave into Y-polarized electromagnetic wave and transmitting the Y-polarized electromagnetic wave to the space opposite to the feed source. The application can solve the problem of high isolation and large-angle low-loss scanning under the severe vehicle environment.

The embodiment of the invention discloses an array radiation unit, an array antenna unit, an array antenna and an antenna device, and relates to the technical field of communication, the array radiation unit takes a first metal patch as a basis, the whole array surface can be arranged on a dielectric substrate of the antenna, and strip-shaped gaps formed in the array radiation unit form a K-waveband reflective array; by setting the length of the strip-shaped gaps, the reflection phase of the K wave band can be obtained, the second metal patch units embedded between the strip-shaped gaps form a reflection array of the Ka wave band, the reflection phase of the Ka wave band can be obtained by scaling the size of the reflection array, and the combination of the array radiation units forms a C wave band phased array. And the antenna shares one radiation structure with the reflective array antenna of the K and Ka wavebands, so that the structure is compact, the aperture multiplexing rate of the common-aperture antenna can be improved through the arrangement of the three-frequency structure, and the gain effect is remarkably improved.

Disclosed examples provide for a reconfigurable reflectarray antenna assembly. A feature of the disclosed antenna assembly is the utilization of a spatial phase shifting technique within each unit cell of an antenna array. The unit cell includes sub-wavelength capacitive patches. These capacitive patches are moved such that the device achieves beam steering, and in turn, achieves wideband continuous phase reflections over a broad frequency range. This enables 2D millimeter-wave beam steering without the need for electronic elements such as diodes and MEMS integration on the surface.

The present invention discloses a high-power, electrically controlled, phase-modulated reflectarray antenna based on liquid crystal materials. The antenna comprises a feed source and a reflectarray, wherein the feed source is positioned above the reflectarray. The reflectarray comprises a plurality of reflectarray units, each comprising a radiating patch, a dielectric plate, a liquid crystal layer, and a reflective surface. The dielectric plate is positioned above the liquid crystal layer, the radiating patch is positioned between the dielectric plate and the liquid crystal layer, and the reflective surface is positioned below the liquid crystal layer. The present invention achieves fast-response, electrically controlled phase-modulated performance, overcoming the long response time limitations of conventional high-power antennas that use mechanically rotating arrays for beam steering. It also eliminates the limitations on antenna efficiency caused by insertion loss from forced feeding, maintaining high efficiency while achieving high gain.

The application discloses a microstrip reflective array antenna and a design method thereof, and belongs to the field of antenna technology.The microstrip reflective array antenna comprises a feed source and a planar reflective array antenna which is oppositely arranged with the feed source through a support.The planar reflective array antenna is a single-layer patch structure which is coupled to a back microstrip line through a gap for phase shifting, and is used for realizing a standing wave bandwidth of 15%, satisfying a dual-polarization working characteristic, and stably working at an angle of 45 degrees and having an aperture efficiency of not less than 30%.The microstrip reflective array antenna and the design method thereof are used, and through design based on simulation analysis, the obtained sample has excellent aperture efficiency.

The invention discloses a high-power circularly polarized reflective array antenna applied to hard rock crushing, and belongs to the technical field of microwave antennas. The antenna comprises a circular polarization horn feed source and a plane reflection array composed of a plurality of basic units capable of independently rotating. The basic unit adopts a structure that a quincunx metal patch, a supporting metal wall and a metal base are integrally wrapped by an insulating injection molding medium, and continuous regulation and control of a reflection phase are realized through the rotating unit. The device has extremely high power capacity, can realize high-precision energy focusing in a near-field region, and effectively improves the coupling efficiency of microwave energy to rock mass through a circular polarization working mode. The antenna is firm in structure, flexible in regulation and control and suitable for microwave-assisted rock breaking and other industrial scenes.

The present application discloses a reflectarray antenna unit, a reflectarray antenna and a manufacturing method. The upper dielectric substrate and the lower dielectric substrate of the reflectarray antenna unit are press-fitted and connected. A radiation patch is provided at a corner of the top surface of the upper dielectric substrate. A first coupling slot, a second coupling slot and a third coupling slot are provided on the upper foil plate below the radiation patch. The lower dielectric substrate contains metallized vias, which together with the upper foil plate and the lower foil plate form a dielectric integrated waveguide. The metallized vias include first metallized vias uniformly distributed around the antenna unit and on at least one side of the radiation patch. The three slots and the radiation patch act as resonators, and there is coupling and cross-coupling between them, which have filtering characteristics and can effectively suppress out-of-band interference. The reflectarray antenna uses an air-feed method to feed each antenna unit, and has the characteristics of low loss, low profile and high gain, good signal quality, and has the characteristics of miniaturization and integration.

The invention provides a high-frequency-ratio triple-band antenna for Wi-Fi / WiGig application. The high-frequency-ratio triple-band antenna comprises a first dielectric plate and a second dielectric plate, one surface of the first dielectric plate is defined as a front surface, the other surface of the first dielectric plate is defined as a back surface, the front surface of the first dielectric plate is provided with a reflective array surface and a rectangular patch, the back surface of the first dielectric plate is provided with a grid patch and a dipole array arranged in a blank area of the grid patch, and the grid patch and the dipole array are multiplexed as a floor in the reflective array antenna; a metal floor is arranged on one surface, opposite to the back surface of the first dielectric plate, of the second dielectric plate, and a first through hole and a second through hole which are respectively used for feeding the grid patch antenna and the dipole array antenna are formed in the metal floor; and a differential feed network, a power divider and a band-pass filter are arranged on the other surface of the second dielectric plate. The grid patch antenna, the dipole array and the reflective array antenna have a multiplexing relation in structure, three-frequency work can be realized without adding extra space, and the integration level of the antenna structure is improved.