Antenna Regions
The distinction between electromagnetic fields far from, and those near to, the antenna.
These are usually classified into three zones located by drawing spheres of different radii around the antenna.:
Near (static) Zone
- Radius < 1 wavelength of field produced by the antenna
- The field patterns are complicated.
- The shape is a function of the radius and angular position.
Intermediate (induction) Zone
- Radius = 1
- The field patterns are complicated.
- The shape is a function of the radius and angular position.
Far Zone
- Radius > 1
- The field components (E and H) lie transverse to the direction of the propagation
- The shape of the field pattern is independent of the radius at which it is taken.
See also: Antenna.
Subjects: Electromagnetism