A satellite antenna, generally referred to as a big pot, is a metal paraboloid, which reflects satellite signals to the feed and LNB at the focal point. A satellite antenna is to collect weak signals from satellites and remove noise as much as possible. Most antennas are typically paraboloid-shaped. Some multiple-focus antennas also consist of spherical reflectors and parabolic reflectors. After reflected by a parabolic antenna, satellite signals concentrate at the antenna's focal point.
The satellite television receiving system consists of the parabolic antenna, the feed, LNB and the satellite receiver, which form a complete set of satellite receiving station.
A parabolic antenna is to reflect energy of satellite signalsand have energy converged toward a focus.
A feed is a horn at the focal point of a parabolic antenna to converge satellite signals. It indicates a source of feeding energy, which collects all of the energy converging at the focal point. A feedforward satellite receiving antenna generally uses the large angle corrugated feed.
LNB (Low Noise Block) is to lower frequency of satellite signals from the feed and amplify signals and then transmit signals to the satellite receiver. The lower the noise temperature is, the better the LNB is.
A satellite receiver is to demodulate satellite signals transmitted by LNB and obtain satellite television image signals and audio signals.
Polarization mode of satellite television signals.
There are four polarization modes of satellite television signals, including right-handed circular polarization, left-hand circular polarization, vertical polarization and horizontal polarization.