Parabolic-antenna meaning

părə-bŏlĭk
An antenna that receives or sends electromagnetic signals such as radio waves or microwaves by using a parabolic mirror to focus incoming radiation onto one reception point or to direct the emissions of radiation from a focal source point into a beam.
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An antenna used for sending or receiving radio signals that uses the principle of a parabolic mirror to focus incoming signals onto one reception point or direct the emissions of signals from a focal source point into a directed beam. Parabolic antennae are used extensively in radio communications, especially with satellites, and in radar.
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A bowl-shaped antenna that reflects and focuses incoming radio waves into a narrow beam directed toward a receiver typically positioned above the center of the unit. Also called a "dish" or "mirror," parabolic antennas are used for satellite signals and planetary telescopes. The reflective mirror design can also emit energy such as in a flashlight or automobile headlight. See DBS.
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An antenna comprising a parabolic reflector with a transmitting and receiving element positioned at or near its focal point. The parabolic reflector is made of a reflective material, usually metal, and is shaped like a parabola, which looks much like a cross-section of a bowl. A parabolic reflector shapes a transmitted radio signal, focusing it into a collimated beam, with increased power density, or signal strength. Similarly, the reflector gathers an incoming signal and focuses it on the receiving element with greater intensity, i.e., gain.A fully circular parabola, or paraboloid, is a three-dimensional parabola that looks much like a shallow bowl. A paraboloid antenna shapes a radio signal much as the mirror in a flashlight shapes an optical signal. Paraboloid antennas are used on satellites to create spot beams. See also collimation, gain, satellite, and spot beam.
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