Antenna Feed system
The term “antenna feed system” usually refers to all of the components between the beam-shaping part of the antenna and the receiver’s first amplifier. For a transmitting antenna, the feed system consists of everything after the last power amplifier, and might include an antenna tuner unit near the amplifier. It almost certainly includes any impedance matching sections adjacent to, or incorporated into the structure of the antenna.
In a radar or satellite communications antenna the feed might consist of a feed horn, orthomode transducer, polarizer, frequency diplexer, waveguide, waveguide switches, rotary joint, etc.

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