This article does not cite any sources. (December 2009)
Feed horn with concentric rings (left) and LNB (right) on a Hughes DirecWay home satellite dish.An LNBF (LNB with integrated feed horn) that has been cut into two. Visible is the scalar horn antenna (the funnel with concentric rings), which couples the microwave beam into a short waveguide (the tube connecting the feed horn to the LNB electronics part of the LNBF).Feed horn (right) on a military radar antenna. The feed horn must be shaped to produce a radiation pattern tailored to adequately illuminate the reflector.