Antenna effective area

The antenna effective area ( also called the effective antenna area or antenna absorption area ) is a characteristic size of receive antennas. The antenna effective area AW determines which electric power Pzu is taken from the electromagnetic field at a given power density S of the field. The following applies:

From the supplied power can be determined, for example, the tensions at a known electromagnetic field at the antenna connector occur. From the reciprocity theorem, the relationship between maximum antenna effective area and antenna gain G can be derived for a known wavelength λ: