Discuss various Unguided media.

Unguided media include waves through air, water or vacuum. Unguided communication media are as follows:

1. Microwaves — The microwaves are similar to radio and television signals and are used for long distance communication. Microwave transmission consists of a transmitter, receiver and the atmosphere. The microwave transmission is line-of-sight transmission.
2. Radiowaves — The transmission making use of radio frequencies is termed as radio-wave transmission. This transmission includes transmitter, receiver and antenna.
3. Satellites — Satellite communication use the synchronous satellite to relay the radio signal transmitted from ground station. This transmission includes transponders.