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feedhorn

Parabolic antennas can be transmitting or receiving antennas. As receiving antennas, the antenna mirrors focus the received microwaves

in a small feedhorn, which is located at the focal point of the antenna mirror.

Feedhorn for Ku-band, photo: daveswebshop.com

Feedhorn for Ku-band, photo: daveswebshop.com

The feedhorn is part of the receiving system and transmits the reflected microwaves via waveguides to the LNB converter. Feedhorns are independent receiving units, they often form a unit together with the LNB converter: LNB with feedhorn (LNBF). The feedhorn can select the microwaves according to their polarization and suppress unwanted signals from adjacent channels

.

Boom arm with the mounting plane for feedhorn and LNB

Boom arm with the mounting plane for feedhorn and LNB

The feedhorn and LNB converter are mounted on a boom arm at the focal point of the antenna mirror. The size of the feedhorn depends on the antenna geometry and is determined by the ratio of the focal point (F) to the antenna diameter (D): F/D.

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Englisch: feedhorn
Updated at: 23.01.2017
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