1.Isotropic antenna: The antenna which radiates equally in all directions is called isotropic antenna.
The radiation pattern of this antenna is called spherical.

2.Directional antenna: Radiates more in a particular direction and less in other direction
- Major lobe | main lobe: The radiation lobe containing the direction of maximum radiation
- Minor lobe | side lobe : Any lobe except major lobe.
3.Omni directional antenna: The antenna which radiates power only in one direction is called omni directional antenna.

Examples:
Isotropic – Sun, Bulb antenna
Directional – Dipole antenna, Folded dipole antenna.
Omni directional – Horn antenna, Yagi-oda antenna.