Define effective aperture area. What is the relation between effective aperture area and Directivity(gain)?

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22. Define effective aperture area. What is the relation between effective aperture area and Directivity(gain)?

Received power is proportional to the power density, or Poynting vector, of the incident wave. Since the Poynting vector has dimensions of W/m2 , and the received power, Pr, has dimensions of W, the proportionality constant must have units of area.

effective aperture area

where Ae is defined as the effective aperture area of the receive antenna. The effective aperture area has dimensions of m2 , and can be interpreted as the “capture area” of a receive antenna, intercepting part of the incident power density radiated toward the receive antenna. The maximum effective aperture area of an antenna is related to the directivity of the antenna as,

effective aperture area and Directivity(gain)

The maximum effective aperture area as defined above does not include the effect of losses in the antenna, which can be accounted for by replacing D with G, the gain, of the antenna

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