Antennas Used In Satellite Communication

Parabolic antennas are used as high gain antennas for point to point communications in applications such as microwave relay links that carry telephone and television signals between nearby cities wireless wan lan links for data communications satellite communications and spacecraft communication antennas.

Antennas used in satellite communication.

Loop antennas are available in different shapes like circular elliptical rectangular etc. For full earth coverage from a geostationary satellite a horn antenna is used. Horns are also used as feeds for reflector antennas. Antennas in satellite communication types of antenna system use in satellite communication.

1 explain different types of antenna used in satellite communication. The fundamental characteristics of the loop antenna are independent of its shape. May 2013 may 2014 dec 2014. Nearly isotropic antennas can be constructed using multiple small elements and are used as reference antennas for testing other antennas and for field strength measurements and for backup antennas on satellites which work without the satellite being oriented towards a communication station.

If a parabolic reflector antenna is used for transmitting a signal the signal from the feed comes out of a dipole or a horn antenna to focus the wave on to the parabola. Satellite borne communications antennas are located very far from their service area on the earth. An advantage of uhf traditionally used for military communications is that it easily penetrates deep foliage and other obstacles. Hence these are used in telecommunications and broadcasting.

These antennas can also be used as electromagnetic field probes in the microwave bands. A variety of antenna types are used in satellite communications. The simplest physical environment occurs when the antennas are located in free space such as for communication between satellites or from an overhead satellite to ground as suggested in fig. They are also used in radio telescopes.

Communication antennas used in geostationary satellites are normally reflector antennas to overcome the high loss due to height of geo orbit the receiving and transmitting antennas can be the same hardware unit or different depending upon many factors that will be discussed in the coming sections to decide the configuration of satellite. The satellite antenna radiates electric and magnetic fields that have the radial dependence e jkr r of a spherical wave where r is the radial. So parabolic reflectors increase the gain of antennas in satellite communication system. The shape is generally a paraboloid of revolution.

They are widely used in communication links with the frequency of around 3 ghz. It means that the. The most widely used narrow beam antennas are reflector antennas.