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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Patent•
29 Jan 1986
TL;DR: In this article, a lamp assembly integrally comprising the functions of a fog lamp and a cornering lamp on a motor vehicle is described, where the fixed reflector reflects the light rays from the source in the forward direction of the lamp assembly.
Abstract: A lamp assembly integrally comprising the functions of a fog lamp and a cornering lamp on a motor vehicle. Included are an electric bulb or like light source immovably mounted within a lamp housing, a fixed reflector behind the light source, and a movable reflector between the light source and the fixed reflector. The fixed reflector reflects the light rays from the source in the forward direction of the lamp assembly. Considerably less in size than the fixed reflector, the movable reflector is pivotable between a first position, where it coacts with the fixed reflector to reflect the light rays from the source forwardly as when the lamp assembly is being used as a fog lamp, and a second position where the movable reflector deflects part of the light rays from the source toward one side of the lamp assembly as when the lamp assembly is desired to serve the additional function of a cornering lamp. An electric control circuit can be provided to cause the displacement of the movable reflector from the first to the second position upon manual activation of a cornering switch. An alternate embodiment is disclosed which has but one reflector.
52 citations
TL;DR: In this article, the design of a reflectarray antenna consisted of metallic elements, which can be manufactured via the simple die casting process as that for the reflector antennas, resulting in very high radiation efficiency at a low manufacture cost.
Abstract: This letter presents the design of a reflectarray antenna consisted of metallic elements, which can be manufactured via the simple die casting process as that for the reflector antennas. In the design, the reflecting elements are integrated as a whole piece of metal without using any dielectric or air substrates, and result in very high radiation efficiency at a low manufacture cost. The antenna is prototyped at Ku-band for the civilian satellite DTV applications. The experimental results show a radiation efficiency up to 90% comparable to the reflector antennas, and demonstrate the feasibility of the design concept.
52 citations
Patent•
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TL;DR: In this article, a surface acoustic wave filter provided on a substrate, comprising a transducer and a first reflector for surface acoustic waves at one end of the transducers, was presented.
Abstract: A surface acoustic wave filter provided on a substrate, comprising a transducer and a first reflector for surface acoustic waves at one end of the transducer, the first reflector being integral with conductive material that defines a busbar of the filter.
52 citations
TL;DR: A dual-polarized antenna based on a vector synthetic mechanism that mainly embraces four radiators, a feed structure, and a reflector would find its wide application in the future fifth-generation base station application.
Abstract: A dual-polarized antenna based on a vector synthetic mechanism is demonstrated in this letter. It mainly embraces four radiators, a feed structure, and a reflector. All the radiators participate in the synthesis process, and there is almost no cross-polarization current on the radiators. Hence, the antenna element could cover 3.3–3.6 GHz with high port isolation and low cross polarization. A prototype of the antenna element is also experimentally studied. Then, the antenna element is extended to an array. By assigning different weighting factor and phase for each element's port, the antenna array can generate different patterns to meet the multimode requirements of the communication network. High isolation, low cross polarization, low sidelobes, and high front-to-back ratio can still be obtained. Having such merits, the multiple-input–multiple-output antenna would find its wide application in the future fifth-generation base station application.
52 citations
Patent•
14 Sep 1992
TL;DR: In this article, a line focus on the cornea of an eye is proposed to create radial and circumferential curved incisions, including rectilinear and curvilinear line focus.
Abstract: An apparatus and method for delivering radiant energy beams onto an area of a cornea in a line focus to create a linear incisions. The radiant energy beams may be focused in a linear configuration onto the external surface of the cornea or onto intrastromal areas of the cornea of an eye to ablate the cornea in a radial slot, circumferential curved slot, or lenticular pattern, and thereby modify its curvature and refractive power. The apparatus includes an array of central reflectors and an assembly of peripheral reflectors. Each central reflector is associated with a respective peripheral reflector so that a beam reflected by the central reflector is intercepted by its associated peripheral reflector and is again reflected to precisely incise either external or internal areas of the cornea. Each peripheral reflector has a curved reflective surface to provide a line focus on the cornea, including both rectilinear and curvilinear line focus to create radial and circumferential curved incisions. In a modified embodiment, the assembly of peripheral reflectors and the array of central reflectors rotate to permit lathing of the cornea.
52 citations