Early localizer arrays used antenna elements that were nearly omnidirectional in a horizontal plane, in order to generate both a front and back course, and to transmit all-around "clearance" (full scale right or left) signals. The Instrument Landing System (ILS) localizer provides azimuth guidance to aircraft on final approach to landing, by radiating guidance signals from an antenna array located at the stop end of the runway and disposed perpendicular to the runway. H01Q21/22- Antenna units of the array energised non-uniformly in amplitude or phase, e.g.H01Q21/06- Arrays of individually energised antenna units similarly polarised and spaced apart.238000006467 substitution reaction Methods 0.000 description 2.238000005755 formation reaction Methods 0.000 description 2.230000015572 biosynthetic process Effects 0.000 description 2.FKDHHVKWGRFRTG-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine Chemical compound 1OC(=N)C=1N1CCOCC1 FKDHHVKWGRFRTG-UHFFFAOYSA-N 0.000 description 2.238000000926 separation method Methods 0.000 description 8.Application granted granted Critical Publication of US4415902A publication Critical patent/US4415902A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by US Government filed Critical US Government Priority to US06/258,793 priority Critical patent/US4415902A/en Assigned to UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF TRANSPORTATION reassignment UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF TRANSPORTATION ASSIGNMENT OF ASSIGNORS INTEREST. Original Assignee US Government Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Redlich Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/258,793 Inventor Robert W.
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Google Patents Array for reducing the number of antenna elements for radiating instrument landing system localizer signalsĭownload PDF Info Publication number US4415902A US4415902A US06/258,793 US25879381A US4415902A US 4415902 A US4415902 A US 4415902A US 25879381 A US25879381 A US 25879381A US 4415902 A US4415902 A US 4415902A Authority US United States Prior art keywords array antenna elements line localizer elements Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4415902A - Array for reducing the number of antenna elements for radiating instrument landing system localizer signals US4415902A - Array for reducing the number of antenna elements for radiating instrument landing system localizer signals
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