paraboloid antenna
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Paraboloid — of revolution In mathematics, a paraboloid is a quadric surface of special kind. There are two kinds of paraboloids: elliptic and hyperbolic. The elliptic paraboloid is shaped like an oval cup and can have a maximum or minimum point. In a… … Wikipedia
Parabolic antenna — A parabolic satellite communications antenna at Erdfunkstelle Raisting, the biggest facility for satellite communication in the world, in Raisting, Bavaria, Germany. It has a Cassegrain type feed. A parabolic antenna is an antenna that uses a… … Wikipedia
Fan-beam antenna — A fan beam antenna is a directional antenna producing a main beam having a narrow beamwidth in one dimension and a wider beamwidth in the other dimension. This pattern will be achieved by a truncated paraboloid reflector or a circular paraboloid… … Wikipedia
dish antenna — Dish Dish (d[i^]sh), n. [AS. disc, L. discus dish, disc, quoit, fr. Gr. di skos quoit, fr. dikei^n to throw. Cf. {Dais}, {Desk}, {Disc}, {Discus}.] 1. A vessel, as a platter, a plate, a bowl, used for serving up food at the table. [1913 Webster]… … The Collaborative International Dictionary of English
Offset dish antenna — Main types of parabolic antennas An offset dish antenna is a type of parabolic antenna. It is so called because the antenna feed is offset to the side of the reflector, in contrast to a typical axial fed parabolic antenna where the feed is in… … Wikipedia
Reflector (antenna) — An antenna reflector is a device that reflects electromagnetic waves.It is often a part of an antenna assembly.The most common reflector types are * corner reflector which reflects the incoming signal back to the direction it came from *… … Wikipedia
radio telescope — Astron. a system consisting of an antenna, either parabolic or dipolar, used to gather radio waves emitted by celestial sources and bring them to a receiver placed in the focus. [1925 30] * * * Combination of radio receiver and antenna, used for… … Universalium
telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… … Universalium
radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… … Universalium
Parabolic reflector — Parallel waves coming in to a parabolic mirror are focused at a point F A parabolic reflector (or dish or mirror) is a reflective device used to collect or project energy such as light, sound, or radio waves. Its shape is that of a circular… … Wikipedia
Conical scanning — is a system used in early radar units to improve their accuracy, as well as making it easier to steer the antenna properly to point at a target. Conical scanning is similar in concept to the earlier lobe switching concept used on some of the… … Wikipedia
