Antennas Used In Satellite Communication

For full earth coverage from a geostationary satellite a horn antenna is used.

Antennas used in satellite communication.

The shape is generally a paraboloid of revolution. Uhf communications satellites often use downlink frequencies around 250mhz and uplink frequencies around 310 mhz. 1 explain different types of antenna used in satellite communication. 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.

The fundamental characteristics of the loop antenna are independent of its shape. 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. It means that the. A variety of antenna types are used in satellite communications.

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. 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. Explain with neat diagram the antennas used in satellite communication. They are widely used in communication links with the frequency of around 3 ghz.

Satellite borne communications antennas are located very far from their service area on the earth. They are also used in radio telescopes. So parabolic reflectors increase the gain of antennas in satellite communication system. Hence these are used in telecommunications and broadcasting.

Antennas in satellite communication types of antenna system use in satellite communication. 2 explain briefly the offset feed used with paraboloidal reflector antenna stating its main advantages and disadvantages. An advantage of uhf traditionally used for military communications is that it easily penetrates deep foliage and other obstacles. 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.

Horns are also used as feeds for reflector antennas. Loop antennas are available in different shapes like circular elliptical rectangular etc. These antennas can also be used as electromagnetic field probes in the microwave bands.