satelliittiantennin

Satelliittiantennin, often referred to as a satellite dish, is a parabolic reflector antenna used to receive or transmit signals from an orbiting satellite. Its primary function is to focus incoming radio waves from a satellite onto a receiver, or to focus outgoing signals from a transmitter towards a satellite. The characteristic shape of a satellite dish is a paraboloid, which has the property of reflecting all parallel incoming rays to a single focal point.

The size of a satellite dish can vary significantly depending on its purpose and the frequency of the signals it handles. Smaller dishes are commonly used for direct broadcast satellite television reception, while larger dishes are employed for telecommunications, scientific research, and deep space communication. The dish is typically mounted on a movable base, known as an actuator or mount, which allows it to be precisely aimed at the desired satellite in orbit. This aiming process is crucial as satellites move across the sky and require continuous tracking.

The main components of a satellite dish system include the parabolic reflector itself, a feedhorn which collects the focused signal or transmits the signal, and a low-noise block downconverter (LNB) for receiving dishes, which amplifies and converts the high-frequency satellite signal to a lower frequency that can be processed by a receiver. For transmitting dishes, a power amplifier and a feedhorn are used. The efficiency and performance of a satellite dish depend on its precise shape, surface accuracy, and proper alignment.