parabolic antenna


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parabolic antenna

[¦par·ə¦bäl·ik an′ten·ə]
(electromagnetism)
Antenna with a radiating element and a parabolic reflector that concentrates the radiated power into a beam.

parabolic antenna

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.


Dish Antennas
Parabolic antennas are easily recognized by their bowl shape.
References in periodicals archive ?
De Villa told stories of parties honoring patron saints of Guatemalan hamlets that drew thousands of immigrants in Los Angeles; of an illiterate Mayan woman seated in front of a TV and VCR her son brought from the United States, watching a video of him in California; of parabolic antennas and cable TV in tiny highland communities; of a woman whose son sent her so many appliances, they did not fit in her tiny, rural shack; of a community of 5,000 inhabitants of a tiny highland town called Salcaja living outside of Chicago; of a Mayah family living in Canada that speaks two languages -- English and K'iche.
Extensive industry research comparing the costs of parabolic antennas to phased arrays over time show that while parabolic antennas have a lower upfront cost, they become much more expensive to maintain.
The overall dimensions of the terminal are competitive with the size of its parabolic antenna counterpart.
If the simulation is to test a receiving system that operates with a rotating parabolic antenna, each of the simulated target signals would be input to the simulator (from the signal generator) at a signal strength which includes the antenna boresight gain.
If an earth station uses a parabolic antenna, a pedestal is required to spatially track the satellite.
For example, a 1.2 m parabolic antenna has a 3 dB beamwidth of 0.58[degrees] at 30 GHz and 0.88[degrees] at 20 GHz.
The 1.8 m parabolic antenna covers the 400 MHz to 18 GHz frequency range using five interchangeable offset feeds.
The then Alcatel-Thomson Espace combine has been the prime contractor on the program and has supplied 75-bit/sec telegraphy, 2,400/16,000-bit/sec telephony and 75/2,400/16,000-bit/sec data ground stations, shelter mounted transportable stations equipped with 1.3-m-diameter monobloc reflector antennas, a triaxially stabilized antenna for shipboard use and a second type of transportable station with a 3-m parabolic antenna. In addition to the national satellite system.
Invitation to tender: Cabin Equipment Connections, Junction Boxes, Routers, Switches, Communications Cabinets, Parabolic Antenna
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