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<blockquote data-quote="Channel Hopper" data-source="post: 970154" data-attributes="member: 175144">Not true, concentrate on the word 'ellipse' rather than forget the fact the dish is a parabola. The circular paraboloid is one unique example of an infinite number of elliptical paraboloids, each with unique focal point but sharing the same formula.<a href="http://curvebank.calstatela.edu/paraboloid/paraboloid.htm" target="_blank">Elliptic Paraboloid</a><img src="http://upload.wikimedia.org/math/7/e/e/7ee654ee957a5870ba15ee0437ff4e61.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />For a circular paraboloid , a=b.[ATTACH=full]92902[/ATTACH] Whilst I have not studied feedhorn designs of this type, you will see that on many dishes out there, the shape of a matched horn is moulded / cast in a similar elliptical design to maximise the illumination in the required planes, realised by installing at 90 degrees to that of the nearest reflector.</blockquote>

[QUOTE="Channel Hopper, post: 970154, member: 175144"] Not true, concentrate on the word 'ellipse' rather than forget the fact the dish is a parabola. The circular paraboloid is one unique example of an infinite number of elliptical paraboloids, each with unique focal point but sharing the same formula. [URL="http://curvebank.calstatela.edu/paraboloid/paraboloid.htm"]Elliptic Paraboloid[/URL] [IMG]http://upload.wikimedia.org/math/7/e/e/7ee654ee957a5870ba15ee0437ff4e61.png[/IMG] For a circular paraboloid , a=b. [ATTACH=full]92902[/ATTACH] Whilst I have not studied feedhorn designs of this type, you will see that on many dishes out there, the shape of a matched horn is moulded / cast in a similar elliptical design to maximise the illumination in the required planes, realised by installing at 90 degrees to that of the nearest reflector. [/QUOTE]

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