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array directivity - перевод на русский
![Diagram illustrating how directivity is defined. It shows the [[radiation pattern]] of a [[directional antenna]] ''<span style="color:gray;">(R, grey)</span>'' that radiates maximum power along the z-axis, and the pattern of an [[isotropic antenna]] ''<span style="color:green;">(R<sub>iso</sub>, green)</span>'' with the same total radiated power. The directivity is defined as the ratio of the maximum signal strength ''S'' radiated by the antenna to the signal strength ''S''<sub>iso</sub> radiated by the isotropic antenna <math display="block">G = {S \over S_\text{iso}}</math>
Since the directional antenna radiates most of its power into a small solid angle around the z-axis its maximum signal strength is much larger than the isotropic antenna which spreads the same power in all directions. Thus the directivity <math>G</math> is much greater than one.](https://commons.wikimedia.org/wiki/Special:FilePath/Antenna directive gain diagram.svg?width=200 "Diagram illustrating how directivity is defined. It shows the [[radiation pattern]] of a [[directional antenna]] ''<span style=\"color:gray;\">(R, grey)</span>'' that radiates maximum power along the z-axis, and the pattern of an [[isotropic antenna]] ''<span style=\"color:green;\">(R<sub>iso</sub>, green)</span>'' with the same total radiated power. The directivity is defined as the ratio of the maximum signal strength ''S'' radiated by the antenna to the signal strength ''S''<sub>iso</sub> radiated by the isotropic antenna <math display=\"block\">G = {S \over S_\text{iso}}</math>
Since the directional antenna radiates most of its power into a small solid angle around the z-axis its maximum signal strength is much larger than the isotropic antenna which spreads the same power in all directions. Thus the directivity <math>G</math> is much greater than one.")
нефтегазовая промышленность
направленность группы сейсмоприёмников
электроника
коэффициент направленного действия
[direk'tiviti]
общая лексика
коэффициент направленности
направленность
направленность антенны
радиотехника
коэффициент защитного действия
Смотрите также
существительное
физика
направленность (излучения и т. п.)
математика
динамическая таблица
общая лексика
двумерный массив, матрица
в программировании - структура данных, каждый элемент которой адресуется значениями двух индексов: один определяет столбец, а другой - строку расположения данного элемента
нефтегазовая промышленность
двухмерная расстановка
синоним
Смотрите также
математика
одномерная таблица
нефтегазовая промышленность
коэффициент установки
![''Sachsen''-class frigate]] F220 ''Hamburg's'' superstructure of the [[German Navy]]](https://commons.wikimedia.org/wiki/Special:FilePath/APAR.jpg?width=200 "''Sachsen''-class frigate]] F220 ''Hamburg's'' superstructure of the [[German Navy]]")
![[[BMEWS]] & [[PAVE PAWS]] Radars](https://commons.wikimedia.org/wiki/Special:FilePath/PAVE PAWS&BMEWS.svg?width=200 "[[BMEWS]] & [[PAVE PAWS]] Radars")
![AN/SPY-1A radar installation at [[National Severe Storms Laboratory]], Norman, Oklahoma. The enclosing [[radome]] provides weather protection.](https://commons.wikimedia.org/wiki/Special:FilePath/Par installation.jpg?width=200 "AN/SPY-1A radar installation at [[National Severe Storms Laboratory]], Norman, Oklahoma. The enclosing [[radome]] provides weather protection.")
![phase difference]] between adjacent antennas is swept between −120 and 120 degrees. The dark area is the beam or [[main lobe]], while the light lines fanning out around it are [[sidelobe]]s.](https://commons.wikimedia.org/wiki/Special:FilePath/Phasearray.gif?width=200 "phase difference]] between adjacent antennas is swept between −120 and 120 degrees. The dark area is the beam or [[main lobe]], while the light lines fanning out around it are [[sidelobe]]s.")
техника
решетка фазированная
нефтегазовая промышленность
фазированная сейсмическая группа
Определение
Википедия
In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction. It is the ratio of the radiation intensity in a given direction from the antenna to the radiation intensity averaged over all directions. Therefore, the directivity of a hypothetical isotropic radiator is 1, or 0 dBi.
An antenna's directivity is greater than its gain by an efficiency factor, radiation efficiency. Directivity is an important measure because many antennas and optical systems are designed to radiate electromagnetic waves in a single direction or over a narrow-angle. By the principle of reciprocity, the directivity of an antenna when receiving is equal to its directivity when transmitting.
The directivity of an actual antenna can vary from 1.76 dBi for a short dipole to as much as 50 dBi for a large dish antenna.
