199 results about "Reflective array antenna" patented technology

A method of manufacturing a cellular reflectarray antenna arranged in an m by n matrix of radiating elements for communication with a satellite includes steps of determining a delay φm,n for each of said m by n matrix of elements of said cellular reflectarray antenna using sub-steps of: determining the longitude and latitude of operation, determining elevation and azimuth angles of the reflectarray with respect to the satellite and converting theta₀ (θ₀) and phi₀ (φ₀), determining Δβ_m,n, the pointing vector correction, for a given inter-element spacing and wavelength, determining Δφ_m,n, the spherical wave front correction factor, for a given radius from the central element and/or from measured data from the feed horn; and, determining a delay φm,n for each of said m by n matrix of elements as a function of Δβ_m,n and Δφ_m,n..

The invention provides a reflection array antenna beam scanning antenna based on a rotation phase shift surface technology. The reflection array antenna beam scanning antenna comprises a feed source antenna (401) and a reflection array panel (301); the reflection array panel (301) comprises a partial wave beam micro-strip reflection array layer (101) and a high transmittance phase shift surface layer (201); the partial wave beam micro-strip reflection array layer (101) is a micro-strip reflection array panel capable of achieving feed source wave beam deflection and the high transmittance phase shift surface layer (201) is a phase shift surface panel capable of achieving plane wave beam deflection. The partial wave beam micro-strip reflection array layer (101) and the high transmittance phase shift surface layer (201) are stacked through certain air space so that the reflection array panel (301) can be assembled. The positive feeding type is adopted by a feed source antenna (401). The central axis of the reflection array panel (301) serves as an axis and two layers are rotated respectively so that scanning of antenna beams can be achieved. The reflection array antenna beam scanning antenna based on the rotation phase shift surface technology is simple in structure, easy to manufacture, capable of responding to any polarized electromagnetic wave, suitable for sending and receiving the polarized electromagnetic waves and capable of bearing high power.

The invention discloses a millimeter wave folding-type reflective array antenna integrated with a plane feed source. The millimeter wave folding-type reflective array antenna is of a layered structure and is sequentially provided with a polarization grid, a reflective array and the plane feed source from top to bottom. On the basis of a plane substrate integration waveguide structure, a substrate integration waveguide gap array antenna is used as the feed source for conducting feed on folding-type reflection, phase compensation is obtained on a reflection face, spherical waves are converted to plane waves, and therefore the antenna which is high in gain and efficiency and stable in beam pointing is realized. Under the Q-LINKPAN application background and directing at the development demands of a plane-integration and miniaturized long-distance wireless communication system, the low-section antenna which is high in gain and efficiency and capable of being integrated with a plane millimeter wave circuit is realized, the millimeter wave folding-type reflective array antenna has the advantages of being simple in structure, compact in size and low in cost, and the requirements for plane circuit integration are met.

The invention provides a reflective array antenna. The reflective array antenna comprises a reflective array face, and the reflective array face comprises a function board which is used for beam modulating of incidence electromagnetic wave and a reflecting layer which is arranged on one side of the function board and is used for reflecting the electromagnetic wave. The function board comprises two or more function board units. The reflecting layer comprises reflecting units, wherein, the number of the reflecting units corresponds to the number of the function board units. A phase shift unit which is used for shifting phase is formed by each function board unit and each corresponding reflecting unit. The reflective array face has a focusing ability for the incidence electromagnetic wave in a scheduled angle range with a normal direction of the reflective array face. According to the fact that the reflective array antenna has the focusing ability of the incidence electromagnetic wave in the preset angle range, the reflective array antenna is capable of having a plurality of focal points so as to be used for different environment or areas.

The invention discloses a Ku frequency band double-frequency dual-polarization micro-strip plane reflective array antenna. A plane medium substrate is provided with two kinds of frequency passive micro-strip resonance units, each kind of frequency units is arranged in equal rows and equal lines, the distance between every two rows is equal to that between every two lines, the distance is less than or equal to one half of the wavelength of the highest work frequency free space, and each second frequency unit is located at the center of every four first frequency units in a square array. The center of all the first frequency units is provided with a set of gaps, the center of all the second frequency units is provided with a set of gaps perpendicular to the gaps of the first frequency units, and polarization in the two perpendicular directions is formed. Each kind of frequency units is of loop line patch structures with at least two layers, and the size of a loop is determined according to the phase position needing compensation. According to the Ku frequency band double-frequency dual-polarization micro-strip plane reflective array antenna, the phase difference between a feed source and the space of each unit on the array surface is compensated by regulating the size of each micro-strip unit on the medium substrate, reflected waves achieve same-phase superposition in the special direction, pencil beams are formed, and the purpose of high gain is achieved.

The invention is directed to deployable reflectarray antenna structure. In one embodiment, the deployable reflectarray antenna structure includes a pair of flexible electrical elements, a feed antenna, and a deployment mechanism that employs a plurality of tapes to respectively transition the pair of flexible electrical elements from an undeployed state in which the elements are folded towards a deployed state in which the deployment mechanism and electrical elements cooperate to form a reflectarray and a subreflector of a reflectarray antenna structure. Further, the deployment mechanism also operates to position the reflectarray and subreflector relative to one another and to the feed antenna so as to realize a reflectarray antenna structure.

A deployable structure for use in establishing a reflectarray antenna is provided that includes a flexible reflectarray and a deployment structure that includes an endless pantograph for deploying the flexible reflectarray from a folded, undeployed state towards a deployed state in which the flexible reflectarray is substantially planar. In a particular embodiment, the deployment structure includes a plurality of tapes that engage the endless pantograph and are used to establish a positional relationship between the deployed reflectarray and another component of the reflectarray antenna.

The invention discloses a dual frequency band dual polarization spaceborne cloud-rain measurement radar system which is mainly composed of an antenna subsystem, a radio frequency subsystem, a digitalsubsystem, a monitoring subsystem and a power supply subsystem. The antenna subsystem adopts a parabolic reflector/microstrip reflective array antenna feeder system, and comprises a parabolic reflector/microstrip reflective array antenna, a Ka frequency band active phased array feed source, a W frequency band beam waveguide feed system and a Ka/W frequency band shared parabolic reflector/microstrip reflective array antenna. The radio frequency subsystem is connected with the Ka frequency band active phased array feed source, the W frequency band beam waveguide feed system and the digital subsystem. The digital subsystem is connected with a terminal. The system provided by the invention has the advantages that the three-dimensional vertical structure information of clouds and precipitationin the field of view can be quantitatively acquired; and the acquired global cloud-rain three-dimensional structure data can be applied to three-dimensional high-precision inversion of atmospheric clouds and precipitation, can be applied to global extreme weather monitoring and forecasting, and can be applied to atmospheric science and numerical simulation studies.

The invention discloses a low-scattering plane-reflective array antenna mainly solving the problem between the radiation characteristic and the low RCS (Radar Cross Section) characteristic of the traditional antenna. The antenna comprises a feed source (1), an upper medium plate (2), a lower medium plate (3), a radiation array (4), a frequency selection surface (5) and a support frame (6), wherein the feed source (1) adopts a rectangular microstrip structure and is fixed above the upper medium plate (2) through the support frame (6); the radiation array (4) is formed by arranging a plurality of hollow square or hollow round radiation units (40) in a round area and printed on the front of the upper medium plate (2); the frequency selection surface (5) is formed by arranging a plurality of same hollow square or hollow round frequency selection units (501) in a rectangular area and printed on the back of the lower medium plate (3); and the upper medium plate is in clearance fixation withthe lower medium plate. Through the low-scattering plane-reflective array antenna, the RCS of the reflective array antenna can be effectively reduced; and the low-scattering plane-reflective array antenna can be directly applied to the invisible design of weapon platforms.

The invention discloses a split ring metamaterial unit-based dual-frequency circularly polarized plane reflective array antenna. The antenna is provided with a dual-frequency composite plane reflective array and a circularly polarized horn feeding source arranged below the dual-frequency composite plane reflective array, wherein the reflective array comprises grounding metal, an interlayer dielectric substrate, and a metal split ring array plane which is formed by low-frequency and high-frequency split ring units in alternate arrangement and has a center winding two-dimensional array structure; the array plane adopts a multi-partition sub-array parallel structure; and the feeding source comprises a rectangular waveguide, a rectangular waveguide transitional section, a circular waveguide with angle of chamfer, a circular waveguide transitional section, and a circular opening waveguide, wherein the opening of the circular opening waveguide is changed from narrow to wide. The working bandwidth of the reflective array can be improved based on the multi-resonant characteristic of the split ring metamaterial units; by virtue of the multi-partition sub-array parallel design method, the modeling speed and efficiency of the array plane can be effectively improved; and partition processing and shaping of the large-scale plane array can be facilitated.

A center-fed deployable reflectarray antenna system comprised of a stack of flat reflectarray panels, a deployment mast, a waveguide, and an antenna feed. The flat reflector in its deployed configuration is subdivided about its center into n equal panels. The stowed configuration has the n panels arranged in a vertical stack with each separated from the next by a small distance. Panel mounting brackets are attached to each panel at the center area where they would have converged in their deployed configuration. The deployment mast is a hollow cylinder with guide slots cut through its wall. The bottom panel is fixedly attached to the bottom of the deployment mast while the remaining panels are moveable attached to the guide slots. The guide slots are designed so that when going from the stacked to the deployed configuration each panel is moved with respect to the fixed panel along its guide slots a predetermined angle at which point it is dropped to the plane of the fixed panel. The waveguide is located along the central axis of the deployment mast and the antenna feed attached to the waveguide at the appropriate distance from the antenna reflector.

The invention discloses a dual-band dual-polarization wave-beam-controllable microstrip reflective array antenna. The dual-band dual-polarization wave-beam-controllable microstrip reflective array antenna comprises a dielectric substrate, a reflective structure and an antenna feed source, wherein M*N periodically-arranged metal patch units are etched on the upper surface of the dielectric substrate; M and N are integers, wherein M is greater than 1 and less than 50; N is greater than 1 and less than 50; the reflective structure is positioned on the lower surface of the dielectric substrate; a metal floor structure is adopted; and the antenna feed source is positioned in the upper half space of a radiation structure. By adoption of the dual-band dual-polarization wave-beam-controllable microstrip reflective array antenna, the problem that continuous wave-beam scanning cannot be realized by a conventional microstrip reflective array antenna which can only work in a single-band or single-polarization mode is solved; by employing the metal patch units and variable capacitance diodes, the dual-band dual-polarization wave-beam-controllable microstrip reflective array antenna realizes reconfigurable frequency, reconfigurable polarization and wave-beam continuous scanning, thereby satisfying requirements of a radar and a communication system on multifunctional caliber multiplexing; and therefore, the dual-band dual-polarization wave-beam-controllable microstrip reflective array antenna can be applied to the wireless communication field.

A deployable reflectarray antenna includes a plurality of reflectarray antenna panels each having one edge connected to be folded and unfolded. Each reflectarray antenna panel includes a membrane having reflecting elements and a support frame. The support frame includes outer frames surrounding edges of the membrane, and a plurality of reinforcing members disposed in a vertical direction between the outer frames in a length direction.

The invention relates to a holographic reflective array compact range. The holographic reflective array compact range is composed of a feed source, a reflective array antenna and edge teeth, wherein the feed source is fed forward and is vertically irradiated on the reflective array antenna, the reflective array antenna corrects spherical waves emitted by the feed source into plane waves at a close distance, and through caliber layout and inhibition of edge diffraction via the edge teeth, a specific plane wave dead zone is generated so that the far-field condition demand of an antenna pattern or a target RCS test is satisfied. According to the invention, the processing precision of the reflective array antenna is lower than a conventional reflection plane by one order of magnitude, a printing structure is employed, the structure is portable, the manufacturing is simple, the installation is convenient, the manufacturing cost can be decreased, and the holographic reflective array compact range is suitable for low-cost construction of a radiation or scattering test system of a millimeter wave/submillimeter wave band.

The invention provides a microstrip reflective array unit loaded with a cross slot on the ground. The microstrip reflective array unit comprises a patch, a low-dielectric constant dielectric substrate, a high-dielectric constant dielectric substrate, a floor loaded with a cross slot, a foam layer and a floor, wherein the floor loaded with the cross slot is a metal flat plate opened with the cross slot at the middle, the foam layer is a honeycomb flat plate made of foam material or paper, and all adjacent layers are in close contact. Further, the invention also provides a microstrip reflective antenna. The antenna comprises a feeding source and a microstrip reflective array, wherein the feeding source is a pyramidal horn antenna, the microstrip reflective array comprises a plurality of microstrip reflective array units loaded with the cross slots on the ground, which are transversely, longitudinally and uniformly arranged. The unit loaded with the cross slot, provided by the invention, can work in two polarization directions perpendicular to each other, and different polarizations are completely independent to one another. The reflective array antenna has the performance of line-polarized wave conversion.

The invention discloses a planar dual-reflection array antenna. The planar dual-reflection array antenna comprises a polarization selection layer, a main reflection surface, a microstrip patch unit positioned on the main reflection surface and a feed source on the same side with the main reflection surface, wherein the polarization selection layer is used for reflecting an electromagnetic wave signal emitted by the feed source to the main reflection surface; and the microstrip patch unit is used for performing phase compensation on the electromagnetic wave signal reached the main reflection surface and changing the polarization direction of the electromagnetic wave signal to enable the electromagnetic wave signal to transmit to the polarization selection layer to form a synthesized wave beam with an assigned setting direction. Therefore, the section profile height of the planar dual-reflection array antenna is half of that of the conventional reflection array antenna, so that the problem of relatively high section of the antenna is effectively avoided; and meanwhile, the polarization direction of the electromagnetic wave signal is adjusted by the microstrip patch unit of the planar dual-reflection array antenna, so that the performance of the planar dual-reflection array antenna is effectively improved.

The invention provides a single-layer triple-frequency micro-strip reflection array antenna comprising a feed source and a micro-strip reflection array. The micro-strip reflection array comprises a plurality of cross vibrator units which are evenly arranged on the upper surface of a dielectric substrate, and multi-resonant units of which each is formed by combining a circular ring and a circle coaxially. The cross vibrator units respectively work in an X band and in a Ku band through two intersecting directions. The multi-resonant units work in a Ka band. As the cross vibrator units and the multi-resonant units are arranged and the mutual coupling effect between the bands is taken into full account, the single-layer triple-frequency micro-strip reflection array antenna of the invention can simultaneously work in the X, Ku and Ka bands. The single-layer structure makes the aperture of the reflection array antenna fully reused. The micro-strip reflection array antenna of the invention has good multi-frequency radiation performance, has a relatively simple structure, is easy to implement in engineering, and has high value of engineering application.

Provided in the invention is an X/Ku-frequency-band double-frequency dual-polarization microstrip-flat-reflective-array antenna comprising a feed source and a microstrip flat reflective array. The feed source is a pyramidal horn antenna. The microstrip flat reflective array contains a plurality of dual-parallel oscillator units; each dual-parallel oscillator units includes two parallel oscillator pasters with different lengths and identical width: a long oscillator paster and a short oscillator paster; and the units are arranged on a dielectric substrate horizontally and longitudinally in a uniform intersected mode. According to the invention, the provided antenna has the good dual-frequency radiation characteristic and has advantages of simple structure, light weight, and low cost.

The invention discloses a micro-strip reflective array antenna, and mainly solves problems in the prior art that the structure is complicated and the bandwidth is narrower. The micro-strip reflectivearray antenna is formed by periodically arranging a plurality of horizontally and longitudinally uniformly arranged paster units. A reflecting phase of each paster unit is different, and an arrangement period D is 0.3-0.5 Lambda. Each unit successively comprises a paster (1), a medium substrate (2) and a floor (3) from top to bottom. The paster (1) uses a circular structure. The circular paster isprovided with two pairs of gaps (11). The two pairs of the gaps (11) are positioned at two ends of two mutual perpendicular diameter lines of the circle. The micro-strip reflective array antenna is capable of improving the gain bandwidth, simple in structure, smaller in cross-polarization, and good in unit frequency characteristic curve parallelism, and can be used for the electromagnetic wave regulation and control of a microwave band.

The invention provides a micro-strip reflective array antenna with a honeycomb-like unit arrangement, and the antenna works in a Ku waveband. The antenna comprises a feed source and a micro-strip reflective array; the antenna is characterized in that the feed source is a pyramid horn antenna and the feeding mode is positive feed; the micro-strip reflective array is hexagonal, including multi-resonant structural units nested by coaxial hexagonal rings of different sizes in a rotating manner; the multi-resonant structural units are attached to a dielectric substrate in a honeycomb-like arrangement; a foaming layer is arranged between the dielectric substrate and a floor; the beam direction of the whole reflective array is a direction perpendicular to the array plane. The unit arrangement mode of the micro-strip reflective array antenna is different from the conventional transversal and longitudinal arrangement mode; instead, the units of the micro-strip reflective array antenna are in the honeycomb-like arrangement; due to the arrangement mode, the space utilization of the reflective array surface is improved to enable the unit arrangement to be more tightened; and in addition, the micro-strip reflective array antenna is attractive in appearance, wider in bandwidth and good in the radiation performance.