== Characteristics of an Antenna ==

=== Field Regions <ref>http://www.giangrandi.ch/electronics/anttool/regions.shtml</ref>===

There are three types of field regions:

* '''Reactive near field:''' It is in immediate vicinity of antenna. The E-fields and H-fields here are out of phase and there distribution is very complex and it requires large computations to find that distribution. The distance from antenna is deciding factor in this region. It's boundary is given by [[File:Equation68.png]].