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单词 Feed horn
释义

Feed horn

英语百科

Feed horn

Corrugated feed horn and LNB on a Hughes DirecWay home satellite dish.
Feed horn on a military radar antenna.  The feed horn must be shaped to produce a  radiation pattern tailored to adequately illuminate the reflector.
Dual polarity feed horn

In parabolic antennas such as satellite dishes, a feedhorn (or feed horn) is a small horn antenna used to convey radio waves between the transmitter and/or receiver and the parabolic reflector. In transmitting antennas, it is connected to the transmitter and converts the radio frequency alternating current from the transmitter to radio waves and feeds them to the rest of the antenna, which focuses them into a beam. In receiving antennas, incoming radio waves are gathered and focused by the antenna's reflector on the feed horn, which converts them to a tiny radio frequency voltage which is amplified by the receiver. Feed horns are used mainly at microwave (SHF) and higher frequencies.

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