Effective Area

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Effective Area

1. In antenna design, the ratio of the received power available at the terminals of an antenna to the power per unit area in the incident wave. For all antennas, effective area A is related to gain G at a given wavelength Missing Image:img src="SP7-e_files/lambdasm.gif" by the equation:

A / G = Missing Image:img src="SP7-e_files/lambdasm.gif"2 / 4Missing Image:img src="SP7-e_files/pism.gif"
Also called effective aperture. See

aperture. </dd>
The effective area of an ideal antenna is equal to its physical area S. In practice, A/S for microwave antennas is always less than one, a representative value for paraboloids being 0.6. </dd>
2. Same as scattering cross section. </dd>


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use