Showing papers on "Reflective array antenna published in 2020"
TL;DR: In this paper, a double-dipole resonance structure is used as the phase shift unit for the reflectarray for the required phase compensation, and a novel wiring scheme is proposed to reduce the adverse effect of the biasing line on the phase-shift performance and simplify the manufacturing process.
Abstract: This study investigated a novel electronically controlled two-dimensional beam-scanning reflective array antenna (reflectarray), which uses nematic liquid crystals. A double-dipole resonance structure is used as the phase-shift unit for the reflectarray for the required phase compensation. The simulation shows that, for about 7 GHz bandwidth of the phase shift range, over 360° can be achieved at the F-band. In addition, a novel wiring scheme is proposed to reduce the adverse effect of the biasing line on the phase-shift performance and simplify the manufacturing process. A simulation of the designed 39 × 39 reflectarray shows that the maximum beam steering range, maximum gain, and side-lobe level at 115 GHz are 20°, 16.55 dBi, and -8.4 dB, respectively.
4 citations
Patent•
03 Jan 2020
TL;DR: In this article, a reconfigurable planar reflective array antenna of the integrated reflective array provided by the invention comprises a planar reflector array and a phased array antenna, and the reflective unit performs phase compensation on an electromagnetic signal radiated by the phase center of the antenna.
Abstract: A reconfigurable planar reflective array antenna of the integrated reflective array provided by the invention comprises a planar reflective array antenna and a phased array antenna, the planar reflective array antenna comprises a metal back plate and a plurality of reflective units, and the reflective units are arranged on a plane, facing the phased array antenna, of the metal back plate in an array mode; each reflective unit is connected to an antenna controller through an MEMS switch, so that the antenna controller controls the on-off of the MEMS switch to further control whether the reflective unit is switched on or not, and the reflective unit performs phase compensation on an electromagnetic signal radiated by the phased array antenna; the phase center of the phased array antenna coincides with the focus of the planar reflective array antenna. By applying the embodiment of the invention, the reconfigurable high-gain antenna with composite characteristics can be provided for the front end.
1 citations
Patent•
03 Jul 2020
TL;DR: In this paper, a satellite-borne planar reflective array antenna designed to be conformal with the solar panel is presented, which is used to improve the earth data transmission capacity of a small satellite.
Abstract: The invention provides a satellite-borne planar reflective array antenna designed to be conformal with a solar panel, and belongs to the technical field of satellite application. The technical problemthat existing small satellites are poor in earth data transmission capacity is solved. The satellite-borne planar reflective array antenna designed to be conformal with the solar panel comprises a solar panel substrate and a planar reflective array antenna, the planar reflective array antenna comprises an air layer and a dielectric layer which are arranged on the back face of the solar panel substrate, the air layer is located between the solar panel substrate and the dielectric layer, and a plurality of radiation units are arranged on the outer side face of the dielectric layer. The satellite-borne planar reflective array antenna designed to be conformal with the solar panel is adopted, so that the earth data transmission capacity of a small satellite is improved.
Patent•
03 Apr 2020
TL;DR: In this article, a planar reflective array antenna based on a liquid crystal material is proposed to solve the problem of low working frequency, high cost, complex structure and the like in the existing beam scanning reflective array technology.
Abstract: The invention discloses a planar reflective array antenna based on a liquid crystal material, and belongs to the technical field of antenna engineering. The invention mainly aims to solve the problemsof low working frequency, high cost, complex structure and the like in the existing beam scanning reflective array antenna technology. The planar reflective array antenna comprises two metal layers having metal reflection array units with overlapping regions, a liquid crystal layer between the two metal layers, two glass substrates located at the outer sides of the two metal layers and used for medium loading and structure supporting, and a metal floor located below the glass substrate at the lower layer. During one-dimensional mode control, two bias lines are connected with the upper metal layer and the lower metal layer respectively, a bias voltage is set for a column of metal units, and the bias lines can be metal or high-resistance lines. During two-dimensional mode control, each reflection array unit is independently controlled. By changing the bias voltage of the liquid crystal material, the phase of reflected waves can be regulated and controlled, so that beam scanning is achieved. Therefore, the planar reflective array antenna can be widely applied to the communication fields of satellite communication, 5G multi-user-large-scale input and output antennas and the like.
Patent•
28 Feb 2020
TL;DR: In this paper, a reflection array antenna design method based on a diffraction-free focusing theory is described, which belongs to the field of electromagnetism, and is characterized by, to begin with, for a reflective array antenna, designing correspondence relation between the radius and the phase of each patch unit; then, according to the Bessel beam focusing principle, making the array antenna equivalent to an inverted pyramid lens, forming an array phase distribution matrix on the surface, and substituting each phase in the matrix into the correspondence relation of the patch unit to form a diffracted
Abstract: The invention discloses a reflection array antenna design method based on a diffraction-free focusing theory, and belongs to the field of electromagnetism. The method is characterized by, to begin with, for a reflective array antenna, designing correspondence relation between the radius and the phase of each patch unit; then, according to the Bessel beam focusing principle, making the array antenna equivalent to an inverted pyramid lens, forming an array phase distribution matrix on the surface, and substituting each phase in the matrix into the correspondence relation of each patch unit to form a diffraction-free focusing beam; according to a beam deflection formula, forming an array phase distribution matrix required for deflecting any beam at any angle; superposing the phase distribution matrix and the array phase distribution matrix to form an array phase distribution matrix required for deflection focusing of the diffraction-free beam; and substituting each phase in the phase distribution matrix into the corresponding relationship for calculation to form a radius corresponding to the patch unit, and finally, obtaining a target array antenna. The device is simple in overall design, and the focusing range can be effectively regulated and controlled.
Patent•
25 Feb 2020
TL;DR: In this article, a duplex feed source applied to a communication-in-motion system reflective array antenna is presented. But the authors do not consider the use of the antenna in the satellite communication system.
Abstract: The invention provides a duplex feed source applied to a communication-in-motion system reflective array antenna. The duplex feed source comprises a waveguide duplexer and a corrugated horn. The wholewaveguide duplexer is of a Y-shaped structure. The waveguide duplexer comprises an H-surface T-shaped structure, a high-frequency band-pass filter internally provided with a plurality of groups of narrow-edge membranes, a low-frequency band-pass filter internally provided with a plurality of groups of narrow-edge membranes, an impedance matching metal column and an L-shaped impedance matching step. The two ends of the H-surface T-shaped structure are connected with a high-frequency band-pass filter internally provided with a plurality of groups of narrow-edge membranes and a low-frequency band-pass filter internally provided with a plurality of groups of narrow-edge membranes respectively. The corrugated horn comprises a circular waveguide input section and a radiation section. The Ku waveband corrugated horn antenna is loaded at the front end of the waveguide duplexer for combination, the stepped device is loaded in corrugations of the corrugated horn, finally, the S11 in the frequency band can be lower than-15 dB, the out-of-band rejection rate can reach 95 dB, and the duplex feed source can be used as a feed source of a satellite communication reflection array antenna.
Patent•
03 Nov 2020
TL;DR: In this paper, a reflective array antenna with a low radar scattering cross-section was proposed to reduce the frequency band and angular domain range of the antenna, which can be applied to various long-distance wireless communication systems.
Abstract: The invention provides a reflective array antenna with a low radar scattering cross section, and mainly solves the problems that the radar scattering cross section of the existing reflective array antenna reduces the frequency band and the angular domain range is narrow. The antenna comprises a feed source (1) and a reflection array surface (2) located below the feed source, wherein the reflectionarray surface comprises M*N reflection units (3) with the same structure and different parameters, each reflection unit comprises four dielectric substrates and a metal surface printed on each dielectric substrate, each metal surface is composed of an upper metal branch knot, a lower metal branch knot and a metal branch trunk; the upper metal branch knot is composed of three metal patches, the lower metal branch knot is composed of five metal patches, every two of the four dielectric substrates are attached to each other to form two laminated dielectric substrates (31 and 32), wherein the twolaminated dielectric substrates are vertically arranged to form a cross-shaped structure. According to the invention, while the radiation efficiency of the reflective array antenna is ensured, the radar scattering cross section reduction is realized in a wide frequency band and wide angle domain range, and the antenna can be applied to various long-distance wireless communication systems.
Patent•
23 Jun 2020
TL;DR: In this paper, a focusing metasurface reflective array antenna and a preparation method thereof is described. But the antenna is not suitable for the field of microwave wireless energy transmission.
Abstract: The invention discloses a focusing metasurface reflective array antenna and a preparation method thereof. The reflective array antenna is composed of a feed horn and 3600 phase shift units, a complexfeed network is not needed, the manufacturing process is simple, the processing cost is low, and the array is a plane and is easy to disassemble and transfer. Each unit patch is composed of a square ring and a concentric square ring, so that the phase shift compensation range is large, and phase shift is not sensitive to machining errors. Meanwhile, a phase shift unit is high in area utilization rate, reflection characteristic is good and loss is low; multi-point focusing is adopted on the axis, so that the antenna maintains high transmission efficiency in a long distance; and finally, the energy transmission efficiency within the range of 10 m reaches 45% or above, and the antenna is suitable for application and popularization in the field of microwave wireless energy transmission.
Patent•
12 May 2020
TL;DR: In this paper, a folding type circularly polarized reflective array antenna is proposed, which is suitable for being applied to the wireless communication fields of base station communication, satellite communication, wireless local area networks and the like.
Abstract: The invention discloses a folding type circularly polarized reflective array antenna. The antenna comprises a horn-type feed source antenna fixed on a dielectric plate and connected with the ground, two symmetrical feed ports are arranged at the bottom of the horn-type feed source antenna, and a stepped metal diaphragm capable of generating left-handed circularly polarized waves and right-handed circularly polarized waves is arranged in the horn-type feed source antenna. The folding type circularly polarized reflective array antenna disclosed by the invention is simple in structure, the polarization purity of circular polarization can be improved, and the profile of a circularly polarized reflective array can be remarkably reduced. The working frequency of the antenna is 10GHz, the absolute value of S11 of the working frequency of the antenna is less than-10dB, the axial ratio of the antenna is 1.4dB, the sidelobe level of a right-handed circularly polarized wave is less than -10dB forthe 10GHz power frequency, and the antenna gain can reach 22dBic. The antenna has a very low profile, and the profile of the antenna is reduced by 87% compared with that of a conventional circularlypolarized reflective array antenna. The folding type circularly polarized reflective array antenna is suitable for being applied to the wireless communication fields of base station communication, satellite communication, wireless local area networks and the like.