- Feed horn
In
satellite dish and antenna design parlance, a feedhorn (or feed horn) is ahorn antenna used to conveyradio wave s between thetransceiver (transmitter and/or receiver) and the reflector.The feedhorn also selects the polarity of the waves to be received, which helps to
attenuate unwanted signals fromadjacent channel s andtransponder s, and from othercommunications satellite s at nearbyorbital position s. This can be either horizontal or vertical if the polarization islinear , or clockwise or counterclockwise (also called left- and right-handed) if it iscircular . Certain devices can also allow a feedhorn to accept both linear and circular, though these cause a slightinsertion loss to all incoming signals.When used with a
parabolic reflector orlens antenna , thephase center of the horn is usually placed at thefocal point of the reflector, with the3 dB point s of the horn'sradiation pattern set to be at the edge of the reflector. On a satellite dish, the feedhorn is what is mounted at the end of a mast from the center of the dish, or ontripod legs mounted to the edge of the dish.If combined with the
low-noise blockconverter (LNB), the feedhorn is part of anLNBF .ee also
*
Horn (telecommunications)
*Horn antenna
*Horn (telescope)
*Focal cloud
Wikimedia Foundation. 2010.