Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Parabolic_antenna> ?p ?o }
- Parabolic_antenna abstract "A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity. It functions similarly to a searchlight or flashlight reflector to direct the radio waves in a narrow beam, or receive radio waves from one particular direction only. Parabolic antennas have some of the highest gains, that is, they can produce the narrowest beamwidths, of any antenna type. In order to achieve narrow beamwidths, the parabolic reflector must be much larger than the wavelength of the radio waves used, so parabolic antennas are used in the high frequency part of the radio spectrum, at UHF and microwave (SHF) frequencies, at which the wavelengths are small enough that conveniently-sized reflectors can be used.Parabolic antennas are used as high-gain antennas for point-to-point communications, in applications such as microwave relay links that carry telephone and television signals between nearby cities, wireless WAN/LAN links for data communications, satellite communications and spacecraft communication antennas. They are also used in radio telescopes. The other large use of parabolic antennas is for radar antennas, in which there is a need to transmit a narrow beam of radio waves to locate objects like ships, airplanes, and guided missiles. With the advent of home satellite television receivers, parabolic antennas have become a common feature of the landscapes of modern countries.The parabolic antenna was invented by German physicist Heinrich Hertz during his discovery of radio waves in 1887. He used cylindrical parabolic reflectors with spark-excited dipole antennas at their focus for both transmitting and receiving during his historic experiments.".
- Parabolic_antenna thumbnail Erdfunkstelle_Raisting_2.jpg?width=300.
- Parabolic_antenna wikiPageExternalLink dish-with-biquad-feed.
- Parabolic_antenna wikiPageExternalLink www.dishpointer.com.
- Parabolic_antenna wikiPageExternalLink index.html.
- Parabolic_antenna wikiPageExternalLink parabolic_reflector.php.
- Parabolic_antenna wikiPageExternalLink www.sat-direction.com.
- Parabolic_antenna wikiPageExternalLink watch?v=785kRIZ7aeI.
- Parabolic_antenna wikiPageExternalLink parabolic_antenna.html.
- Parabolic_antenna wikiPageID "208264".
- Parabolic_antenna wikiPageLength "33241".
- Parabolic_antenna wikiPageOutDegree "152".
- Parabolic_antenna wikiPageRevisionID "669239242".
- Parabolic_antenna wikiPageWikiLink Airplane.
- Parabolic_antenna wikiPageWikiLink Allen_Telescope_Array.
- Parabolic_antenna wikiPageWikiLink Antenna_(radio).
- Parabolic_antenna wikiPageWikiLink Antenna_aperture.
- Parabolic_antenna wikiPageWikiLink Antenna_boresight.
- Parabolic_antenna wikiPageWikiLink Antenna_feed.
- Parabolic_antenna wikiPageWikiLink Antenna_gain.
- Parabolic_antenna wikiPageWikiLink Astronomer.
- Parabolic_antenna wikiPageWikiLink Bandwidth_(signal_processing).
- Parabolic_antenna wikiPageWikiLink Beam_diameter.
- Parabolic_antenna wikiPageWikiLink Beam_width.
- Parabolic_antenna wikiPageWikiLink Beamwidth.
- Parabolic_antenna wikiPageWikiLink C_band.
- Parabolic_antenna wikiPageWikiLink Cassegrain_antenna.
- Parabolic_antenna wikiPageWikiLink Category:Radio_frequency_antenna_types.
- Parabolic_antenna wikiPageWikiLink Category:Satellite_broadcasting.
- Parabolic_antenna wikiPageWikiLink Classical_antiquity.
- Parabolic_antenna wikiPageWikiLink Coaxial_cable.
- Parabolic_antenna wikiPageWikiLink Collimated_light.
- Parabolic_antenna wikiPageWikiLink Communications_satellite.
- Parabolic_antenna wikiPageWikiLink Cornwall.
- Parabolic_antenna wikiPageWikiLink Curved_mirror.
- Parabolic_antenna wikiPageWikiLink Decibel.
- Parabolic_antenna wikiPageWikiLink Dipole_antenna.
- Parabolic_antenna wikiPageWikiLink Direct-broadcast_satellite.
- Parabolic_antenna wikiPageWikiLink Direct_broadcast_satellite.
- Parabolic_antenna wikiPageWikiLink Directional_antenna.
- Parabolic_antenna wikiPageWikiLink Directivity.
- Parabolic_antenna wikiPageWikiLink Dishware.
- Parabolic_antenna wikiPageWikiLink Electric_current.
- Parabolic_antenna wikiPageWikiLink Electric_field.
- Parabolic_antenna wikiPageWikiLink Electrical_conduction.
- Parabolic_antenna wikiPageWikiLink Electrical_resistivity_and_conductivity.
- Parabolic_antenna wikiPageWikiLink Electromagnetic_interference.
- Parabolic_antenna wikiPageWikiLink Ellipsoid.
- Parabolic_antenna wikiPageWikiLink English_Channel.
- Parabolic_antenna wikiPageWikiLink Feed_horn.
- Parabolic_antenna wikiPageWikiLink File:Erdfunkstelle_Raisting_2.jpg.
- Parabolic_antenna wikiPageWikiLink Fixed-satellite_service.
- Parabolic_antenna wikiPageWikiLink Fixed_Service_Satellite.
- Parabolic_antenna wikiPageWikiLink Flashlight.
- Parabolic_antenna wikiPageWikiLink Focal_length.
- Parabolic_antenna wikiPageWikiLink Focus_(optics).
- Parabolic_antenna wikiPageWikiLink Frequency.
- Parabolic_antenna wikiPageWikiLink Goonhilly_Satellite_Earth_Station.
- Parabolic_antenna wikiPageWikiLink Green_Bank,_West_Virginia.
- Parabolic_antenna wikiPageWikiLink Green_Bank_Telescope.
- Parabolic_antenna wikiPageWikiLink Gregorian_telescope.
- Parabolic_antenna wikiPageWikiLink Grote_Reber.
- Parabolic_antenna wikiPageWikiLink Guglielmo_Marconi.
- Parabolic_antenna wikiPageWikiLink Guided_missile.
- Parabolic_antenna wikiPageWikiLink Heinrich_Hertz.
- Parabolic_antenna wikiPageWikiLink High-gain_antenna.
- Parabolic_antenna wikiPageWikiLink Horn_antenna.
- Parabolic_antenna wikiPageWikiLink Hyperboloid.
- Parabolic_antenna wikiPageWikiLink ITU-R.
- Parabolic_antenna wikiPageWikiLink In-phase_and_quadrature_components.
- Parabolic_antenna wikiPageWikiLink In_phase.
- Parabolic_antenna wikiPageWikiLink Isotropic_antenna.
- Parabolic_antenna wikiPageWikiLink Isotropic_radiator.
- Parabolic_antenna wikiPageWikiLink James_Clerk_Maxwell.
- Parabolic_antenna wikiPageWikiLink KDDI.
- Parabolic_antenna wikiPageWikiLink Linear_polarization.
- Parabolic_antenna wikiPageWikiLink Low-gain_antenna.
- Parabolic_antenna wikiPageWikiLink Main_lobe.
- Parabolic_antenna wikiPageWikiLink Microwave.
- Parabolic_antenna wikiPageWikiLink Microwave_relay.
- Parabolic_antenna wikiPageWikiLink Microwave_transmission.
- Parabolic_antenna wikiPageWikiLink Missile.
- Parabolic_antenna wikiPageWikiLink Mitsubishi_Electric.
- Parabolic_antenna wikiPageWikiLink Nippon_Telegraph_and_Telephone.
- Parabolic_antenna wikiPageWikiLink Numerical_Electromagnetics_Code.
- Parabolic_antenna wikiPageWikiLink Offset_dish_antenna.
- Parabolic_antenna wikiPageWikiLink Optics.
- Parabolic_antenna wikiPageWikiLink Parabola.
- Parabolic_antenna wikiPageWikiLink Parabolic_reflector.
- Parabolic_antenna wikiPageWikiLink Paraboloid.
- Parabolic_antenna wikiPageWikiLink Plane_wave.
- Parabolic_antenna wikiPageWikiLink Point-to-point_(telecommunications).
- Parabolic_antenna wikiPageWikiLink Polarizer.
- Parabolic_antenna wikiPageWikiLink Polarizing_filter.
- Parabolic_antenna wikiPageWikiLink RF_front_end.
- Parabolic_antenna wikiPageWikiLink Radar.
- Parabolic_antenna wikiPageWikiLink Radiation_pattern.
- Parabolic_antenna wikiPageWikiLink Radio_astronomy.
- Parabolic_antenna wikiPageWikiLink Radio_frequency.
- Parabolic_antenna wikiPageWikiLink Radio_receiver.