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- Reflective_array_antenna abstract "In telecommunication and radar, a reflective array antenna is a class of directive antennas in which multiple driven elements are mounted in front of a flat surface designed to reflect the radio waves in a desired direction. They are often used in the VHF and UHF frequency bands. VHF examples are generally large and resemble a highway billboard, so they are sometimes called billboard antennas. The curtain array is a larger version used by shortwave radio stations.Reflective array antennas usually have a number of identical driven elements, fed in phase, in front of a flat, electrically large reflecting surface to produce a unidirectional beam, increasing antenna gain and reducing radiation in unwanted directions. The individual elements are most commonly half wave dipoles, although they sometimes contain parasitic elements as well as driven elements. The reflector may be a metal sheet or more commonly a wire screen. A metal screen reflects radio waves as well as a solid metal sheet as long as the holes in the screen are smaller than about one-tenth of a wavelength, so screens are often used to reduce weight and wind loads on the antenna. They usually consist of a grill of parallel wires or rods, oriented parallel to the axis of the dipole elements.The driven elements are fed by a network of transmission lines, which divide the power from the RF source equally between the elements. This often has the circuit geometry of a tree structure.".
- Reflective_array_antenna thumbnail Eight_bay_bowtie_TV_antenna.jpg?width=300.
- Reflective_array_antenna wikiPageID "41643".
- Reflective_array_antenna wikiPageLength "6391".
- Reflective_array_antenna wikiPageOutDegree "41".
- Reflective_array_antenna wikiPageRevisionID "679596730".
- Reflective_array_antenna wikiPageWikiLink ALLISS.
- Reflective_array_antenna wikiPageWikiLink Antenna_(electronics).
- Reflective_array_antenna wikiPageWikiLink Antenna_(radio).
- Reflective_array_antenna wikiPageWikiLink Antenna_gain.
- Reflective_array_antenna wikiPageWikiLink Beamwidth.
- Reflective_array_antenna wikiPageWikiLink Billboard.
- Reflective_array_antenna wikiPageWikiLink Category:Radio_frequency_antenna_types.
- Reflective_array_antenna wikiPageWikiLink Curtain_array.
- Reflective_array_antenna wikiPageWikiLink Dipole_antenna.
- Reflective_array_antenna wikiPageWikiLink Directional_antenna.
- Reflective_array_antenna wikiPageWikiLink Driven_element.
- Reflective_array_antenna wikiPageWikiLink Duga-3.
- Reflective_array_antenna wikiPageWikiLink Half_wave_dipole.
- Reflective_array_antenna wikiPageWikiLink Light_beam.
- Reflective_array_antenna wikiPageWikiLink Main_lobe.
- Reflective_array_antenna wikiPageWikiLink Microwave.
- Reflective_array_antenna wikiPageWikiLink Over-the-horizon_radar.
- Reflective_array_antenna wikiPageWikiLink Over_the_horizon_radar.
- Reflective_array_antenna wikiPageWikiLink Parasitic_element.
- Reflective_array_antenna wikiPageWikiLink Passive_radiator.
- Reflective_array_antenna wikiPageWikiLink Patch_antenna.
- Reflective_array_antenna wikiPageWikiLink Phase_(waves).
- Reflective_array_antenna wikiPageWikiLink Phase_shift.
- Reflective_array_antenna wikiPageWikiLink Phase_shift_module.
- Reflective_array_antenna wikiPageWikiLink Phase_shifter.
- Reflective_array_antenna wikiPageWikiLink Phased_array.
- Reflective_array_antenna wikiPageWikiLink Radar.
- Reflective_array_antenna wikiPageWikiLink Radiation.
- Reflective_array_antenna wikiPageWikiLink Radiation_pattern.
- Reflective_array_antenna wikiPageWikiLink Radio_wave.
- Reflective_array_antenna wikiPageWikiLink Radio_waves.
- Reflective_array_antenna wikiPageWikiLink Reflector_(antenna).
- Reflective_array_antenna wikiPageWikiLink Shortwave.
- Reflective_array_antenna wikiPageWikiLink Shortwave_radio.
- Reflective_array_antenna wikiPageWikiLink Side_lobe.
- Reflective_array_antenna wikiPageWikiLink Sidelobe.
- Reflective_array_antenna wikiPageWikiLink Skywave.
- Reflective_array_antenna wikiPageWikiLink Telecommunication.
- Reflective_array_antenna wikiPageWikiLink Television_antenna.
- Reflective_array_antenna wikiPageWikiLink Transmission_line.
- Reflective_array_antenna wikiPageWikiLink Ultra_high_frequency.
- Reflective_array_antenna wikiPageWikiLink Ultrahigh_frequency.
- Reflective_array_antenna wikiPageWikiLink Very_high_frequency.
- Reflective_array_antenna wikiPageWikiLink File:Eight_bay_bowtie_TV_antenna.jpg.
- Reflective_array_antenna wikiPageWikiLink File:SCR-270-set-up.jpg.
- Reflective_array_antenna wikiPageWikiLinkText "Reflective array antenna".
- Reflective_array_antenna wikiPageWikiLinkText "Reflective array".
- Reflective_array_antenna wikiPageWikiLinkText "array antennas".
- Reflective_array_antenna wikiPageWikiLinkText "bedspread array".
- Reflective_array_antenna wikiPageWikiLinkText "reflect arrays".
- Reflective_array_antenna wikiPageWikiLinkText "reflective array antenna".
- Reflective_array_antenna wikiPageWikiLinkText "reflective array".
- Reflective_array_antenna align "left".
- Reflective_array_antenna caption ""Bowtie" UHF TV antenna from 1954".
- Reflective_array_antenna caption ""Panel array" VHF TV broadcasting antenna. This type is widely used for UHF today".
- Reflective_array_antenna caption "1950.0".
- Reflective_array_antenna caption "A modern form of reflective array is the "bow tie" UHF television antenna. This example has two dipole driven elements in front of a grill reflector. The "bow-tie" dipoles, consisting of two V-shaped elements, have a larger bandwidth than ordinary dipoles, allowing the antenna to cover the wide UHF television band.".
- Reflective_array_antenna caption "An ALLISS antenna, a modular type of curtain array used by international shortwave stations for broadcasting to distant areas by skywave.".
- Reflective_array_antenna caption "Enormous reflective array antenna of the Duga-3 or "Steel Yard" over-the-horizon radar system, Chernobyl, Ukraine, part of the Soviet early-warning network. It transmits at frequencies between 7 and 19 MHz. The pairs of cylindrical cages at right are the half wave dipole driven elements. Behind them is a reflector screen of horizontal wires, just visible in center.".
- Reflective_array_antenna caption "VHF reflective array TV antenna from 1954".
- Reflective_array_antenna direction "horizontal".
- Reflective_array_antenna hasPhotoCollection Reflective_array_antenna.
- Reflective_array_antenna image "2007.11".
- Reflective_array_antenna image "6".
- Reflective_array_antenna image "Bowtie UHF TV antenna 1954.png".
- Reflective_array_antenna image "Dipole array TV broadcast antenna.jpg".
- Reflective_array_antenna image "Reflective array VHF television antenna 1954.jpg".
- Reflective_array_antenna image "SCR-270 Radar Antenna2.jpg".
- Reflective_array_antenna image "Woodpecker array.jpg".
- Reflective_array_antenna width "111".
- Reflective_array_antenna width "112".
- Reflective_array_antenna width "185".
- Reflective_array_antenna width "230".
- Reflective_array_antenna width "245".
- Reflective_array_antenna width "270".
- Reflective_array_antenna width "279".
- Reflective_array_antenna wikiPageUsesTemplate Template:Antenna_Types.
- Reflective_array_antenna wikiPageUsesTemplate Template:FS1037C_MS188.
- Reflective_array_antenna wikiPageUsesTemplate Template:Multiple_image.
- Reflective_array_antenna subject Category:Radio_frequency_antenna_types.
- Reflective_array_antenna hypernym Antennas.
- Reflective_array_antenna type Article.
- Reflective_array_antenna type Article.
- Reflective_array_antenna type Source.
- Reflective_array_antenna comment "In telecommunication and radar, a reflective array antenna is a class of directive antennas in which multiple driven elements are mounted in front of a flat surface designed to reflect the radio waves in a desired direction. They are often used in the VHF and UHF frequency bands. VHF examples are generally large and resemble a highway billboard, so they are sometimes called billboard antennas.".
- Reflective_array_antenna label "Reflective array antenna".
- Reflective_array_antenna sameAs m.0bfnl.
- Reflective_array_antenna sameAs Q7307317.
- Reflective_array_antenna sameAs Q7307317.
- Reflective_array_antenna wasDerivedFrom Reflective_array_antenna?oldid=679596730.
- Reflective_array_antenna depiction Eight_bay_bowtie_TV_antenna.jpg.
- Reflective_array_antenna isPrimaryTopicOf Reflective_array_antenna.