An antenna is basically a conductor of small length which is used to radiate or receive electromagnetic waves. At the transmitting end, it helps to convert high frequency current into electromagnetic waves. At the receiving end, it helps to transform, electromagnetic waves into original electrical signal.
Types of Antenna:
Dipole Antenna: A dipole antenna is one directional and is used to transmit radio waves. The length of dipole antenna should be as such it is in resonance with the carrier frequency.
Dish Antenna: Dish antenna is highly directional and it is used for the transmission of UHF (Ultra high frequency) and micro waves. This is used in radars and satellite antenna.