DBpedia 2016-04

Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Helical_resonator> ?p ?o }

Showing triples 1 to 38 of 38 with 100 triples per page.

Helical_resonator abstract "A helical resonator is a passive electrical component that can be used as a filter resonator.Physically, a helical resonator is a wire helix surrounded by a square or cylindrical conductive shield. One end of the helix is connected to the shield and the other end is left open (Weston, 2001, p. 660). The device works like a coaxial resonator, but it is much shorter because the helical inner conductor reduces the velocity of wave propagation (Lancaster, 2006, p. 99).Like cavity resonators, helical resonators can achieve Q factors in the 1000s. This is because at high frequencies, the skin effect results in most of the current flowing on the surface of the helix and shield. Plating the shield walls and helix with high conductivity materials increases the Q beyond that of bare copper (Blattenberger, 1989).The length of wire is one quarter of the wavelength of interest. The helix is space wound, the gap between turns is equal to the diameter of the wire (Blattenberger, 1989). If the open end of the helix is close to the end cap of the metal shield the length is somewhat reduced due to the capacitance between the conductor and the shield (Whittaker, 2000, p. 227).Coupling to the resonator can be achieved with a tap wire soldered to the helix at some distance from the shorted end. Input impedance varies with distance from the shorted end by impedance transformer action. The tap point is chosen to achieve an impedance match with the connected circuit. Tuning of the resonator may be achieved by inserting a screw into the central axis of the helix (Weston, 2001, p. 660). Other means of input and output coupling used are a wire loop coupling to the magnetic field near the shorted end, or a probe capacitively coupling near the open end. Coupling between resonators in a multi-resonator filter is often simply achieved with apertures in the shielding between them (Whittaker, 2000, p. 227).Helical resonators are well suited to UHF frequencies ranging from 600 MHz to 1500 MHz (Blattenberger, 1989).".
Helical_resonator thumbnail Helical_Resonator_(3116177343).jpg?width=300.
Helical_resonator wikiPageExternalLink helical-resonator.htm.
Helical_resonator wikiPageID "21516878".
Helical_resonator wikiPageLength "3657".
Helical_resonator wikiPageOutDegree "15".
Helical_resonator wikiPageRevisionID "634461313".
Helical_resonator wikiPageWikiLink Category:Distributed_element_circuits.
Helical_resonator wikiPageWikiLink Category:Electrical_components.
Helical_resonator wikiPageWikiLink Coaxial_resonator.
Helical_resonator wikiPageWikiLink Electric_current.
Helical_resonator wikiPageWikiLink Electrical_resistivity_and_conductivity.
Helical_resonator wikiPageWikiLink Electronic_component.
Helical_resonator wikiPageWikiLink Electronic_filter.
Helical_resonator wikiPageWikiLink Helix.
Helical_resonator wikiPageWikiLink Passivity_(engineering).
Helical_resonator wikiPageWikiLink Q_factor.
Helical_resonator wikiPageWikiLink Resonator.
Helical_resonator wikiPageWikiLink Skin_effect.
Helical_resonator wikiPageWikiLink Stub_(electronics).
Helical_resonator wikiPageWikiLink Ultra_high_frequency.
Helical_resonator wikiPageWikiLink File:Helical_Resonator_(3116177343).jpg.
Helical_resonator wikiPageWikiLinkText "helical resonator".
Helical_resonator wikiPageUsesTemplate Template:OCLC.
Helical_resonator subject Category:Distributed_element_circuits.
Helical_resonator subject Category:Electrical_components.
Helical_resonator hypernym Component.
Helical_resonator type MilitaryUnit.
Helical_resonator type Circuit.
Helical_resonator type Component.
Helical_resonator comment "A helical resonator is a passive electrical component that can be used as a filter resonator.Physically, a helical resonator is a wire helix surrounded by a square or cylindrical conductive shield. One end of the helix is connected to the shield and the other end is left open (Weston, 2001, p. 660). The device works like a coaxial resonator, but it is much shorter because the helical inner conductor reduces the velocity of wave propagation (Lancaster, 2006, p.".
Helical_resonator label "Helical resonator".
Helical_resonator sameAs Q5704945.
Helical_resonator sameAs m.05h276k.
Helical_resonator sameAs Q5704945.
Helical_resonator wasDerivedFrom Helical_resonator?oldid=634461313.
Helical_resonator depiction Helical_Resonator_(3116177343).jpg.
Helical_resonator isPrimaryTopicOf Helical_resonator.