Topic
Reflector (antenna)
About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.
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26 Jan 1979
TL;DR: In this article, a reflector antenna system suitable for ground stations used in communication with geostationary satellites is described, and a novel method for shaping subreflectors using the ratios of ray lengths squared and variable focal lengths is applied in the optimally tilted offset geometry results in almost uniform aperture power distributions.
Abstract: A reflector antenna system is described suitable for ground stations used in communication with geostationary satellites. Dual beams or multi-beams can be directed at several satellites spaced angularly from 5° to 20° apart and these beams are scanned by feed motion keeping a single main reflector surface fixed. Offset feed geometry is used for low aperture blocking and shaping of subreflectors and main reflector results in very high aperture efficiencies, low sidelobes and symmetric low cross-polarization patterns needed for satellite links. A novel method for shaping subreflectors using the ratios of ray lengths squared and variable focal lengths is applied in the optimally tilted offset geometry results in almost uniform aperture power distributions. A new general procedure for shaping doubly curved surfaces intercepting a known population of rays such that these rays are focused to a point or reflected in a given direction is used to shape the main reflector for elimination of aperture phase errors and to shape a second subreflector which focuses perfectly to the apex of a second feed horn.
142 citations
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TL;DR: In this paper, the authors describe the design, ground testing, an in-orbit experiment, and a novel inorbit operation for large deployable antenna reflectors (LDRs).
141 citations
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11 Jun 1981TL;DR: In this paper, a linear array of feed elements is used to produce a fixed linear phase taper along the minor axis by all elements by linearly scanning the array along the major axis of the aperture of the array, a beam is scanned along an arc which can be made to correspond to an orbital arc segment around a celestial body.
Abstract: The present invention relates to phased array antenna arrangements which comprise a linear array of feed elements where the array has an aperture which is out at a bias angle along the minor axis of the array to produce a fixed linear phase taper along the minor axis by all elements Then by linearly scanning the array along the major axis of the aperture of the array, a beam is scanned along an arc which can be made to correspond to an orbital arc segment around a celestial body and within the field of view of the antenna arrangement when the bias angle is properly chosen The feed elements can comprise long feedhorns or horn antenna configurations which can be used in a separate array or disposed in an array on a conjugate plane of a main cylindrical reflector when used in multiple reflector phased array antenna arrangements
141 citations
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21 Sep 2015
TL;DR: In this article, an antenna having at least one reflector for improving radiation efficiency, gain, and directivity is disclosed, where the reflector is positioned relative to the antenna to redirect electromagnetic radiation away from surrounding materials or objects that affect, i.e., reflect, refract, diffract, absorb and scatter the antenna's electromagnetic radiation.
Abstract: An antenna having at least one reflector for improving radiation efficiency, gain, and directivity is disclosed. The antenna may be formed on a substrate or be a standalone conductive material that is designed to operate in at least one band of frequency. The antenna includes a reflector for each band of frequency the antenna is designed to operate in. The reflector is positioned relative to the antenna to redirect electromagnetic radiation of the antenna away from surrounding materials or objects that affect, i.e., reflect, refract, diffract, absorb and scatter the antenna's electromagnetic radiation.
140 citations
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15 Sep 2010
TL;DR: In this paper, a band clamp for coupling a radome to a distal end of a reflector dish for improving the front to back ratio of the reflector antenna is proposed. But the band clamp is not suitable for the use of a single antenna.
Abstract: A band clamp for coupling a radome to a distal end of a reflector dish for improving the front to back ratio of a reflector antenna, the band clamp provided with an inward projecting proximal lip and an inward projecting distal lip. The distal lip dimensioned with an inner diameter equal to or less than a reflector aperture of the reflector dish. The proximal lip provided with a turnback region dimensioned to engage an outer surface of a signal area of the reflector dish in an interference fit. A width of the band clamp may be dimensioned, for example, between 0.8 and 1.5 wavelengths of an operating frequency.
140 citations