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Was (wer) ist synthetic aperture antenna - definition
AREA, ORIENTED PERPENDICULAR TO THE DIRECTION OF AN INCOMING RADIO WAVE, WHICH WOULD INTERCEPT THE SAME AMOUNT OF POWER FROM THAT WAVE AS IS PRODUCED BY THE ANTENNA RECEIVING IT
Antenna effective area; Radiating aperture; Aperture efficiency; Effective aperture; Effective area; Antenna area; Antenna effective length; Antenna length; Aperture efficiency (antennas); Antenna aperture
Aperture (antenna)
In electromagnetics and antenna theory, the aperture of an antenna is defined as "A surface, near or on an antenna, on which it is convenient to make
Aperture
![Thomas Blount]], ''Glossographia Anglicana Nova: Or, A Dictionary, Interpreting Such Hard Words of whatever Language, as are at present used in the English Tongue, with their Etymologies, Definitions, &c. Also, The Terms of Divinity, Law, Physick, Mathematics, History, Agriculture, Logick, Metaphysicks, Grammar, Poetry, Musick, Heraldry, Architecture, Painting, War, and all other Arts and Sciences are herein explain'd, from the best Modern Authors, as, Sir Isaac Newton, Dr. Harris, Dr. Gregory, Mr. Lock, Mr. Evelyn, Mr. Dryden, Mr. Blunt, &c.'', London, 1707.</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/ApertureDefn1707.png?width=200 "Thomas Blount]], ''Glossographia Anglicana Nova: Or, A Dictionary, Interpreting Such Hard Words of whatever Language, as are at present used in the English Tongue, with their Etymologies, Definitions, &c. Also, The Terms of Divinity, Law, Physick, Mathematics, History, Agriculture, Logick, Metaphysicks, Grammar, Poetry, Musick, Heraldry, Architecture, Painting, War, and all other Arts and Sciences are herein explain'd, from the best Modern Authors, as, Sir Isaac Newton, Dr. Harris, Dr. Gregory, Mr. Lock, Mr. Evelyn, Mr. Dryden, Mr. Blunt, &c.'', London, 1707.</ref>")
![Diagram of decreasing aperture sizes (increasing [[f-number]]s) for "full stop" increments (factor of two aperture area per stop)](https://commons.wikimedia.org/wiki/Special:FilePath/Aperture diagram.svg?width=200 "Diagram of decreasing aperture sizes (increasing [[f-number]]s) for \"full stop\" increments (factor of two aperture area per stop)")
![Alvin Clark polishes the big [[Yerkes Observatory]] [[Great Refractor]] objective lens, with 40 inches 102 cm across, in 1896.](https://commons.wikimedia.org/wiki/Special:FilePath/Yerkes Observatory Astro4p6.jpg?width=200 "Alvin Clark polishes the big [[Yerkes Observatory]] [[Great Refractor]] objective lens, with 40 inches 102 cm across, in 1896.")
HOLE OR OPENING THROUGH WHICH LIGHT TRAVELS
Aperture stop; Aperture Stop; Apertures; Lens aperture; Aperature; Aperture factor; Apature; Optimal aperture; Clear aperture; Aperture (optics)
·noun The act of Opening.
II. Aperture ·noun An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
III. Aperture ·noun The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
Inverse synthetic-aperture radar
Inverse Synthetic aperture radar; Inverse Synthetic Aperture Radar; Inverse SAR; Inverse synthetic aperture radar
Inverse synthetic-aperture radar (ISAR) is a radar technique using radar imaging to generate a two-dimensional high resolution image of a target. It is analogous to conventional SAR, except that ISAR technology uses the movement of the target rather than the emitter to create the synthetic aperture.
Wikipedia
Aperture (antenna)
In electromagnetics and antenna theory, the aperture of an antenna is defined as "A surface, near or on an antenna, on which it is convenient to make assumptions regarding the field values for the purpose of computing fields at external points. The aperture is often taken as that portion of a plane surface near the antenna, perpendicular to the direction of maximum radiation, through which the major part of the radiation passes."
