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IEVref:712-02-47ID:
Language:enStatus: Standard
Term: (total) effective area (of an antenna for a given direction)
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Definition: in a given direction, the ratio of the available power at the terminals of a receiving antenna to the power flux density of a plane wave incident from that direction, the wave being polarization matched to the antenna

NOTE 1 – If no direction is specified, the direction corresponding to maximum available power is implied.

NOTE 2 – The total effective area is the sum of the partial effective areas for any two orthogonal polarizations of components of the antenna polarization.

NOTE 3 – In free space, the effective area Ae for a given direction of an antenna when used for reception is related to the absolute gain Gi for the given direction when the same antenna is used for transmission by the equation:

G i = 4π A e λ 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbb a9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9 q8qiLsFr0=vr0=vr0db8meaabaGacmGadiWaaiWabaabaiaafaaake aacaWGhbWaaSbaaSqaaiaabMgaaeqaaOGaeyypa0ZaaSaaaeaacaaI 0aacdaGae8hWdaNaamyqamaaBaaaleaacaqGLbaabeaaaOqaaiabeU 7aSnaaCaaaleqabaGaaGOmaaaaaaaaaa@4393@

where λ is the wavelength.

NOTE 4 – When an aperture illumination function is uniform in amplitude and phase and the given direction is perpendicular to the aperture, the total effective area of a radiating aperture of a lossless antennas is equal to its geometric area.


Publication date:1992-04
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Internal notes:2017-06-02: Cleanup - Remove Attached Image 712-02-47.gif
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