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- Antenna_aperture abstract "In electromagnetics and antenna theory, antenna aperture or effective area is a measure of how effective an antenna is at receiving the power of radio waves. The aperture is defined as the 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. At any point, a beam of radio waves has an irradiance or power flux density (PFD) which is the amount of radio power passing through a unit area. If an antenna delivers an output power of Po watts to the load connected to its output terminals when irradiated by a uniform field of power density PFD watts per square metre, the antenna's aperture Aeff in square metres is given by:.So the power output of an antenna in watts is equal to the power density of the radio waves in watts per square metre, multiplied by its aperture in square metres. The larger an antenna's aperture is, the more power it can collect from a given field of radio waves. To actually obtain the predicted power available Po, the polarization of the incoming waves must match the polarization of the antenna, and the load (receiver) must be impedance matched to the antenna's feedpoint impedance.Although this concept is based on an antenna receiving a radio frequency wave, knowing Aeff directly supplies the (power) gain of that antenna. Due to reciprocity, an antenna's gain in receiving and transmitting are identical. Therefore Aeff can just as well be used to compute the performance of a transmitting antenna. Note that Aeff is a function of the direction of the radio wave relative to the orientation of the antenna, since the gain of an antenna varies according to its radiation pattern. When no direction is specified, Aeff is understood to refer to its maximum value, with the antenna oriented so its main lobe, the axis of maximum sensitivity, is directed toward the source.".
- Antenna_aperture wikiPageID "1470583".
- Antenna_aperture wikiPageRevisionID "603293575".
- Antenna_aperture hasPhotoCollection Antenna_aperture.
- Antenna_aperture subject Category:Antennas.
- Antenna_aperture type Antenna102715229.
- Antenna_aperture type Antennas.
- Antenna_aperture type Artifact100021939.
- Antenna_aperture type Device103183080.
- Antenna_aperture type ElectricalDevice103269401.
- Antenna_aperture type Instrumentality103575240.
- Antenna_aperture type Object100002684.
- Antenna_aperture type PhysicalEntity100001930.
- Antenna_aperture type Whole100003553.
- Antenna_aperture comment "In electromagnetics and antenna theory, antenna aperture or effective area is a measure of how effective an antenna is at receiving the power of radio waves. The aperture is defined as the 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_aperture label "Antenna aperture".
- Antenna_aperture label "Antennenwirkfläche".
- Antenna_aperture label "Эффективная площадь антенны".
- Antenna_aperture sameAs Antennenwirkfläche.
- Antenna_aperture sameAs m.0542dc.
- Antenna_aperture sameAs Q571946.
- Antenna_aperture sameAs Q571946.
- Antenna_aperture sameAs Antenna_aperture.
- Antenna_aperture wasDerivedFrom Antenna_aperture?oldid=603293575.
- Antenna_aperture isPrimaryTopicOf Antenna_aperture.