Radio wave can be classified by Frequency and wavelength. When the frequency is higher than 3Ghz, it is named microwave . Satellite communication is special case of microwave relay system. Satellite communication use the synchronous satellite to relay the radio signal transmitted from ground station . In recently , the use of wireless communication has gained more popularity. Compare to the traditional fixed wire terrestrial networks, satellite and microwave communication network features the time saving, fast implementation and abroad coverage characteristic. It provides voice,fax,data and video service as well as email,file transfer ,WWW internet application. When fixed wire terrestrial communication networks are crushed by a disaster, the satellite and microwave system as a emergency backup facility will be started. In satellite communication the earth station consists of a satellite dish that functions as an antenna and communi...