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Based upon directivity, antennas can be divided in three groups:
* '''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.
[[File:Isotropic.jpg|left|frame|Isotropic]][[File:Omni.jpg|center|frame|Omnidirectional]][[File:Directional.png|right|frame|Directional]]
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|+Typical directivities of some common antennas
