Shri Ramdeobaba College of Engineering and Management, Nagpur, India
Department of Electronics Engineering
Satellite Communication System
Name: Omkar Rinke(55), Abhayraj Singh Chauhan(57), Bhuvanesh
Hatwar(65)
Course Name: Microwave Theory And Techniques
Course Code: ENT361-2
Course Coordinator: Prof. A.R.Tiwari
INTRODUCTION
The satellite communication system antenna is the most visible
component. At the radio frequency (RF) end of the electromagnetic
spectrum, the antenna sends and receives the modulated carrier signal.
The frequencies used for satellite communication span from around 0.3
GHz (VHF) to 30 GHz (Ka-band) and beyond.
Fig1: The 90×90 mm multi-feed array antenna
Types of Satellite Communications Antenna:
1.Three-Axis stabilized satellite
It's extremely usual to station-keep satellites
whose attitude is entirely controlled (that is, the
orientation of the satellite's three main axes is
controlled). The antennas can be as simple as a
narrowband paraboloid reflector mounted on a
two-axis pedestal, or as complex and distinctive as
NASA's ATS-6 satellite multiple frequency
multiple-beam antenna [SI].
Fig2: Spin and Three-Axis Stabilization Credits - NASA
2. MULTIPLE-BEAM ANTENNAS
The above is an attempt to highlight the diverse range of antenna
performance requirements that have emerged throughout time as satellite
configurations and needs have changed.
This is advantageous since additional requirements are frequently discovered
after a satellite has been operational; this is especially true in defense, or
military, communication systems.
Fig3: Beam Direction
Fig4: Formation of multi-beam radiation
Conclusions:
Antennas are unavoidable in wireless communication systems, as is widely
known. The first artificial satellite produced by the USSR (Union of Soviet
Socialist Republics),telecommunication technology for space began to develop
rapidly. For space communication systems, however, the importance of
antennas as the first or ultimate RF-front end device has not changed.
References:
1. A mist of Satellite Communication Systems, vol. 111. Defense Communications Agency:
Washington, DC, Sept. 12,1973.
2. J. B. Rankin, et al., “Multifunction single package antenna system for
spin-stabilized
near-synchronous satellite,” ZEEE Trans. Antennas Propagat., vol. AP-17, pp. 435-442, July 1969.