Satellite antenna (Description)

Satellite antenna

Satellite antenna - this dish antennas to receive the signal from the satellite.

The most common satellite dishes are parabolic antennas (they are usually called satellite). Satellite antennas are different types and sizes. Most often, such antennas are used to receive and transmit satellite TV programs and radio, as well as connections to the Internet. There are two types of parabolic antenna - direct focal and offset.

direct focal antenna



Direct focal (axisymmetric) antenna is an antenna of the classical type of a paraboloid of revolution. This contributes to a more precise orientation to the selected satellite. Typically, such an antenna for receiving a signal used in the C-band is weaker than the signal in the Ku-band. However, the signal can take, and Ku-band, as well as combined.

offset antenna



Offset antenna - the most prevalent in the individual reception of satellite television, although currently in use, and other principles of satellite ground antennas. Offset antenna is an elliptic paraboloid (in cross section of the ellipse). Focus of this segment is located below the geometrical center of the antenna. This eliminates shadowing useful area irradiator antenna and supports, which increases its efficiency when using the same area axisymmetric mirror antenna. Besides, the illuminator is set below the center of gravity of the antenna, thereby increasing its stability under wind loads. Offset antenna mounted almost vertically. Depending on the latitude angle of inclination is slightly different. This provision precludes the antenna picking up a cup of precipitation, which strongly affect the quality of reception. Normally fed antennas are used for receiving a signal Ku-band (linear and circular polarization). However, the possible and the signal reception in C-band, as well as combined.

The toroidal antenna



The toroidal dish antenna - a new product category, for reception of satellite signals from multiple satellites without using rotating devices. Unlike conventional parabolic antenna that has a carefully-designed reflective surface. Since the second reflector is realized by the ability to install a larger number of converters to receive the signal. Under specific conditions, this dish antenna opens up new opportunities for satellite signal reception.
The antenna is made of galvanized steel coated with polyester paint. On the holder can accommodate up to 16 converters. The minimum spacing between two adjacent converters: 3 degrees.
Antenna Installation requires the precision of the azimuth, elevation and slope.

For the manufacture of satellite antennas are used mainly steel and duralumin. Fans of satellite TV is sometimes set motopodves (motor) or positioner. With the actuator and at the user's (or team with tuner), it allows you to rotate the antenna to the desired position of the satellite you.