Talk:Feed horn

Need to put reflector phase correction (or compensation) characteristics. --user:Brandon.irwin

Feed horns are antennas in their own right, and don't need to be combined with dishes. This page should reflect that. Also, dishes can be fed by patch antennas, helical antennas, or even yagis, although feed horns are certainly fairly popular for this purpose. --ssd 06:26, 9 January 2006 (UTC)

2006
Yes I agree but do feed horns need correction possibly being so close in the near field? Also the pattern from the feed horn needs to be shaped to feed the main reflector effeciently. Other types of horn apart from the rectangular: Potter (or smooth conical), scalar or corrugated. I think they have Gaussian patterns and are quite axially symmetric so are good for circular rreflectorsChrisAngove 19:17, 12 November 2006 (UTC)

2011, but related to 2006 above
Adding a comment five years later :)  .... A good and very well known example of a feedhorn used as an antenna in its own right is the "radar gun" used, for example, in both vehicle and sports related speed measurement. THis is an example of ssd's comment about the page needing to reflect this. Old_Wombat (talk) 08:21, 20 November 2011 (UTC)

OK, I propose this change. Here is the opening sentence as it stands, with my suggested sentence afterwards.

" ... In satellite dish and antenna design, a feedhorn (or feed horn) is a small horn antenna used to convey radio waves between the transmitter and/or receiver and the reflector, particularly in parabolic antennas. Ãlso, a feedhorn can be used as an antenna in its own right. The well-known "radar gun" used in both vehicle and sports related speed measurement, is a good example. ..." — Preceding unsigned comment added by Old wombat (talk • contribs) 07:48, 23 December 2011 (UTC)

Image
Would an image of one make this article better? I have a couple decent pictures that I don't mind anybody using. Dalef 21:49, 25 February 2007 (UTC)

Feedhorn vs coaxial coupler
"it ... converts the radio frequency alternating current from the transmitter to radio waves and feeds them to the rest of the antenna"

Feedhorns often connect directly to waveguide and simply transform the impedance of the waveguide to that of free space in a particular direction. A coaxial coupler converts the RF alternating current to EM waves. Sometimes feedhorns have integral couplers. The higher you go in frequency or power, the less likely this is because waveguide has much lower loss than coax.

Both the corrugated feed horn and the military radar feed horns shown connect to waveguide. The Dual polarity "feed horn" shown is actually a coaxial coupler, and isn't a feed horn at all. 2601:5CE:4380:544:D82E:B606:9FBA:550F (talk) 18:57, 10 March 2019 (UTC)