Antenna effective area

The antenna  effective area A _W (also effective antenna area or antenna absorption area ) is a characteristic of receiving antennas . It determines which electrical power  P is drawn _from the electromagnetic field at a given power density  S of the field:

${\displaystyle A_{W}={\frac {P_{zu}}{S}}\Leftrightarrow P_{zu}=S\cdot A_{W}}$

From the supplied power z. B. determine which voltages occur with a known electromagnetic field  S at the antenna connection.

The relationship between the maximum effective antenna area and antenna gain G at a known wavelength  λ can be derived from the reciprocity law :  

${\displaystyle A_{W,max}={\frac {\lambda ^{2}}{4\cdot \pi }}\cdot G}$

See also

• Radar cross section

literature

• Eugen Philippow (Hrsg.): Taschenbuch Elektrotechnik. 3rd, heavily edited Edition. Verlag Technik, Berlin 1989, ISBN 3-341-00201-4 .