1,212
edits
Changes
no edit summary
Based upon directivity, antennas can be divided in three groups:
[[File:Isotropic.jpg|thumb|200px|frame|Isotropic]][[File:Omni.jpg|frame|thumb|200px|Omnidirectional]][[File:Directional.png|thumb|frame|200px|Directional]]
* '''Isotropic:''' An isotropic antenna is an ideal antenna which radiates uniform power in all directions. Hence it's directivity would be 1(0 dB).
* '''Omnidirectional:''' Omnidirectional antenna radiates uniform power in a single plane and its power diminishes as we go away from the plane. Hence it's radiation pattern resembles a “doughnut”.
* '''Directional:''' Directional antennas can radiate greater amount of power in a specific direction compared to any other direction. Their directivities are very high. They have complicated (and often interesting) radiation patterns.
{| class="wikitable"
|+Typical directivities of some common antennas