الفهرس 
SummryOnly 14 pages are availabe for public view
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Abstract
Telecommunication field is growiong rapidly and than new services are continuously offered. At the present time, satellite communication systems represent the major telecommunication fields which have rapid development. The birth of radio communication by stellite is outcome of research in the area of communications whose objective is to increase range and capacities with the lowest possible costs. By combining the use of rocket technology, microelectronics technology, and antenna technology, the area of satellite communication is opened up. In more than twenty years of developments, experiments and operational experience, the field of satellite communication appears to become mature, specially in its technology. satellite services are no longer confined to organization or large groups of users but it extended to satisfy individual demand for all over the world. Nowadays, it gas become available for users, wherever located. The technological importace of high power, and wide bandwidth traveling wave tube amplifiers (TWTA), liw noise fronted receiver amplifiers, fast digital logic circuits, large satellite antennas, and the productionof large number of satellites, is indisputable.