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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
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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.
Immigration key in U.S.-Guatemalan relations
The overall dimensions of the terminal are competitive with the size of its parabolic antenna counterpart.
A K- and Ka-band vehicular phased-array antenna
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.
EW Simulation Part 7 -- Antenna Emulation
If an earth station uses a parabolic antenna, a pedestal is required to spatially track the satellite.
Antenna selection to minimize pointing requirements. (Technical Feature)
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.
SELECTING A PEDESTAL FOR TRACKING LEO SATELLITES AT KA BAND
The 1.8 m parabolic antenna covers the 400 MHz to 18 GHz frequency range using five interchangeable offset feeds.
Near-field focusing of a high field EMC test antenna
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.
Converging lines

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