A Cutler feed is a type of antenna used in radars operating in microwave frequencies. It consists of a coin-shaped resonant cavity that is placed at the end of a waveguide. Slots, typically two, are cut into the side of the chamber facing the parabolic reflector. The system is almost always found in conical scanning systems. It has the advantage of being very robust mechanically, with the disk being not much larger than the waveguide and the waveguide itself acting as the primary support. To perform conical scanning, either the disk or the entire feed can be rotated.
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