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- Log-periodic_antenna abstract "A log-periodic antenna (LP), also known as a log-periodic array or aerial, is a multi-element, directional, narrow-beam antenna that operates over a broad band of frequencies. The antenna normally consists of a series of dipoles positioned along the antenna axis, spaced at following a logarithmic function of the frequency. It is normal to drive alternating elements with 180° (π radians) of phase shift from one another. This is normally done by connecting individual elements to alternating wires of a balanced transmission line. LP antennas are widely used with television receivers, especially in the VHF band. LP's are also used for UHF, but have more recently been increasingly replaced by the Grey-Hoverman antenna and similar designs.The log periodic antenna was invented by Dwight E. Isbell, Raymond DuHamel and variants by Paul Mayes. The University of Illinois at Urbana-Champaign had patented the Isbell and Mayes-Carrel antennas and licensed the design as a package exclusively to JFD electronics in New York. Channel Master and Blonder-Tongue ignored the patents and produced a wide range of antennas based on this design. Lawsuits regarding the antenna patent which the UI Foundation lost, evolved into the Blonder-Tongue Doctrine. This precedent governs patent litigation.In this connection, it should be strictly noted that the "log-periodic shape" does not provide with broadband property for antennas. Actually, broadband property of so-called Log-periodic Antenna comes from self-complementary antenna that has always constant input impedance, 60π≒188.4 (Ω), independent of the frequency and its shape with Infinite freedom.This antenna design is used where a wide range of frequencies is needed while still having moderate gain and directionality. It is sometimes used for a (VHF/UHF) television antenna.".
- Log-periodic_antenna thumbnail Schwarzbeck_UHALP_9108_A.jpg?width=300.
- Log-periodic_antenna wikiPageExternalLink blonder-tongue-doctrine.
- Log-periodic_antenna wikiPageExternalLink log-periodic.php.
- Log-periodic_antenna wikiPageExternalLink lpda.php.
- Log-periodic_antenna wikiPageExternalLink log%20periodic_A.htm.
- Log-periodic_antenna wikiPageID "41332".
- Log-periodic_antenna wikiPageRevisionID "602567211".
- Log-periodic_antenna hasPhotoCollection Log-periodic_antenna.
- Log-periodic_antenna subject Category:Radio_frequency_antenna_types.
- Log-periodic_antenna comment "A log-periodic antenna (LP), also known as a log-periodic array or aerial, is a multi-element, directional, narrow-beam antenna that operates over a broad band of frequencies. The antenna normally consists of a series of dipoles positioned along the antenna axis, spaced at following a logarithmic function of the frequency. It is normal to drive alternating elements with 180° (π radians) of phase shift from one another.".
- Log-periodic_antenna label "Antenne log-périodique".
- Log-periodic_antenna label "Log-periodic antenna".
- Log-periodic_antenna label "Logarithmisch-periodische Antenne".
- Log-periodic_antenna label "対数周期アンテナ".
- Log-periodic_antenna sameAs Logarithmisch-periodische_Antenne.
- Log-periodic_antenna sameAs Antenne_log-périodique.
- Log-periodic_antenna sameAs 対数周期アンテナ.
- Log-periodic_antenna sameAs m.0bbmv.
- Log-periodic_antenna sameAs Q1433783.
- Log-periodic_antenna sameAs Q1433783.
- Log-periodic_antenna wasDerivedFrom Log-periodic_antenna?oldid=602567211.
- Log-periodic_antenna depiction Schwarzbeck_UHALP_9108_A.jpg.
- Log-periodic_antenna isPrimaryTopicOf Log-periodic_antenna.