Antenna & its Types

By T.Jayachandran/ECE

Nandha Engineering College

Objectives Describe Antenna State the types & applications of

Antenna

Introduction An antenna is an electrical device which

converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver.

In transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves).

Introduction Transmitting Antenna Receiving Antenna:

ANTENNA APPLICATIONSThey are used in systems such as Radio broadcasting Broadcast television Two-way radio Communication receivers Radar Cell phones Satellite communications.

Quarter-wave whip antenna on an FM radio for 88-108 MHz Rubber Ducky

antenna on UHF 446 MHz walkie talkie with rubber cover removed.

Yagi-Uda television antenna 47-68 MHz

Log-periodic antenna covering 140-470 MHz

parabolic dish antenna Parabolic Reflector Dish Antenna

Parabolic antenna/ Microwave antenna/point to point antenna

Slotted / Sectored antenna

Horn antenna

Printed antenna

Dipole

Radiation Mechanism