feedantenni

A feed antenna, often referred to as a feedhorn, is a crucial component in parabolic reflector antenna systems. Its primary function is to collect or transmit radio waves and direct them towards or receive them from the main reflector. The feed antenna is positioned at the focal point of the parabolic dish, where the converging or diverging radio waves are most concentrated.

The design of a feed antenna is critical for the overall performance of the antenna system. It needs to efficiently capture the electromagnetic energy reflected by the dish and couple it into the transmission line or radiating element. Conversely, it must radiate energy from the transmission line in a way that is effectively focused by the parabolic reflector. Common types of feed antennas include horns, dipoles, and microstrip antennas.

The shape and dimensions of the feed antenna are carefully matched to the focal length and diameter of the parabolic reflector to achieve optimal illumination of the dish surface. This matching ensures that the radio waves are reflected uniformly, leading to a focused beam with minimal side lobes. In satellite dish installations, the feedhorn is typically housed in a protective casing and mounted on an arm extending from the dish. Its precise alignment is essential for establishing a reliable signal connection.