Antenna effective aperture

A useful parameter is calculated for the effective area of ​​the antenna received power. This is also known as the effective aperture. Suppose a plane wave (receiving the same polarization of the antenna) after the antenna. Also assume that the wave antenna is traveling towards the antenna in the direction of maximum radiation (direction, will be received from the maximum power).

The effective aperture parameter describes how much power is captured from a plane wave. Let us have a “W” plane wave power (watts per square meter / m ^ 2) density. In addition, the defined “P” represents the power at the antenna end. (This is the power supply to the antenna for reception). The following formula is correct:

Therefore, the effective area captures power from plane waves. This is from the power antenna to the receiver. The loss factor of the inner antenna (ohmic loss, dielectric loss, etc.) in this area.

General relationship of any effective aperture of peak gain “G” Antenna:

The effective aperture or effective area measures the effective aperture of the actual antenna with a given known antenna. It is also possible to find the effective area by calculation, using the measured gain and the equation above.

The effective aperture will be a useful concept to calculate the received power from a plane wave. To see this action, go to the next section of the Frings transfer formula.

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From: http://www.hj-antenna.com/antenna-effective-aperture/