ABSTRACT
A communication satellite is essentially a microwave relay in the sky, operating at 22,300 miles above the earth's equator. It receives microwave signals in a given frequency and retransmits them at a different frequency. Satellites provide an efficient means of reaching isolated places on the earth and are considerably less expensive than terrestrial communication links for select applications. Communication satellites are a versatile form of wireless communication. What distinguishes communication satellites from other forms of wireless communication (mobile telephone, paging, etc.) is their high orbital position and movement.
