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field measurements - translation to russian
строительное дело
полевые методы исследования (физико-технических характеристик грунтов)
нефтегазовая промышленность
эксплуатационные измерения, измерения в условиях эксплуатации
полевые измерения, измерения в полевых условиях
![genus]] two (two handles). The genus can be read off the field of meromorphic functions on the surface.](https://commons.wikimedia.org/wiki/Special:FilePath/Double torus illustration.png?width=200 "genus]] two (two handles). The genus can be read off the field of meromorphic functions on the surface.")
![The fifth roots of unity form a [[regular pentagon]].](https://commons.wikimedia.org/wiki/Special:FilePath/One5Root.svg?width=200 "The fifth roots of unity form a [[regular pentagon]].")
математика
алгебраическое поле
Definition
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Wikipedia
Antenna measurement techniques refers to the testing of antennas to ensure that the antenna meets specifications or simply to characterize it. Typical parameters of antennas are gain, bandwidth, radiation pattern, beamwidth, polarization, and impedance.
The antenna pattern is the response of the antenna to a plane wave incident from a given direction or the relative power density of the wave transmitted by the antenna in a given direction. For a reciprocal antenna, these two patterns are identical. A multitude of antenna pattern measurement techniques have been developed. The first technique developed was the far-field range, where the antenna under test (AUT) is placed in the far-field of a range antenna. Due to the size required to create a far-field range for large antennas, near-field techniques were developed, which allow the measurement of the field on a surface close to the antenna (typically 3 to 10 times its wavelength). This measurement is then predicted to be the same at infinity. A third common method is the compact range, which uses a reflector to create a field near the AUT that looks approximately like a plane-wave.
