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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08 Jul 2001
TL;DR: In this paper, the authors proposed a layered lens antenna for high-gain antennas, which can transform a spherical wave emanating from a feed into a collimated beam (plane wave), with the advantage that the space-fed array surface can have almost any shape including a plane.
Abstract: Reflectors are the most commonly used antennas in high-gain applications. Although very efficient radiators, they require highly accurate curved reflecting surfaces that are often cumbersome to implement. Consequently, alternatives have been investigated. Space-fed arrays are particularly relevant to this work. As in a reflector, these structures transform a spherical wave emanating from a feed into a collimated beam (plane wave), with the advantage that the space-fed array surface can have almost any shape, including a plane. However, since reflection-type space-fed arrays (e.g., reflectarrays) require the same surface accuracy as a reflector, a transmission type space-fed array (e.g., a layered lens antenna) is often a more desirable alternative. A preliminary design procedure, theoretical analysis and an 8.421 GHz layered lens prototype are presented. The theoretical analysis is based on a full-wave treatment of plane wave transmission through a uniform infinite array of elements. The prototype lens was designed for maximum gain and minimum number of layers (three). Although the presented material is preliminary, it clearly indicates that layered lenses are good candidates for high-gain antennas.
51 citations
TL;DR: In this paper, reflector shapes for truncated non-imaging cusp concentrators having various acceptance angles are presented, as well as curves for height/aperture and mirror arc length/apperture ratios versus concentration ratio.
51 citations
Patent•
13 Sep 1982
TL;DR: In this paper, a solar desalination system is proposed, in which fresh water is derived from sea water by focussing solar ray energy from a collecting reflector onto an evaporator tube located at substantially the focal apex of the reflector.
Abstract: A solar desalination system in which fresh water is derived from sea water by focussing solar ray energy from a collecting reflector onto an evaporator tube located at substantially the focal apex of the reflector. The reflector/evaporator tube assembly is mounted on a horizontal open grid platform which may support a plurality of parallel reflector/evaporator tube assemblies. The reflectors may serve as pontoons to support the desalination system unit on a body of sea water. The solar heat generated vapor is condensed in condenser tubes immersed in the sea water. Intermittently sea water concentrate is withdrawn from the evaporator tubes. Velocity of the vapor passing from the evaporator tubes to the condensers may be utilized for generating power.
51 citations
Patent•
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07 Apr 2006
TL;DR: In this article, a light-emitting diode is implemented as an independent convex portion projecting from the main surface, and a reflector is arranged on the main surfaces so as to surround an outer perimeter of the sealing resin portion.
Abstract: A light-emitting diode includes a substrate having a main surface, a light-emitting diode device arranged on the main surface, a translucent sealing resin portion sealing the light-emitting diode device so that the light-emitting diode device is implemented as an independent convex portion projecting from the main surface, and a reflector arranged on the main surface so as to surround an outer perimeter of the sealing resin portion with an inclined surface at a distance from the outer perimeter
51 citations
TL;DR: In this paper, a Yagi-Uda antenna with a stepped-width reflector is presented, which is shorter than the driven element as a result of the stepped width structure.
Abstract: A Yagi-Uda antenna with a stepped-width reflector is presented. Totally different than the traditional ones, the proposed reflector is shorter than the driven element as a result of the stepped-width structure. To further understand its working mechanics, an equivalent circuit to a dipole with a parasitic element is employed to explain the shortened length of the stepped-width reflector. Then, the proposed stepped-width reflector, shorter than the driven element, was applied to design, fabrication, and measurement of a Yagi-Uda antenna. Measured results show a good agreement with the simulated ones. In particular, the total length of the reflector employed in the Yagi-Uda antenna is 50 mm, and that of the driven element is 53 mm, which verifies the shorter length of the reflector and benefits achieving a smaller size.
51 citations