[Moon-net] Parabola Model, Pattern generation; with Random surface errors

[Rastislav Galuscak]

Hello Pat,

   I am afraid, that it is not possible to calculate such electrically large structure as is Jamesburg dish antenna (involving also it`s surface deviation) with professional el.mag. modelling softwares as are CST MW Studio , FEKO or HFSS due to huge amount of data. This task must be calculated separately as an independed efficiency coefficient of whole antenna, or must be involved in illumination efficiency coefficient. More about this problem you can find in the book " THE PARABOLOIDAL REFLECTOR ANTENNA IN RADIO ASTRONOMY AND COMMUNICATION" by JACOB W.M. BAARS,  ISBN-10: 0-387-69733-0. In the book are also  some routines written in software package "Mathematica" which you may find useful for your purposes.

   Sincerely, 
                     Rasto OM6AA

--- On Fri, 9/26/08, Pat Barthelow <aa6eg at hotmail.com> wrote:
From: Pat Barthelow
 <aa6eg at hotmail.com>
Subject: [Moon-net]
 Parabola Model, Pattern
 generation; with Random surface errors
To: moon-net at list-serv.davidv.net
Date: Friday, September 26,
 2008, 12:46 PM

Folks: 

Are there any Antenna modeling programs, within reach of EME enthusiasts ( If
not them, then avaailable for professional work)  that would allow you to enter
a fine detail theoretical  surface coordinate database, then have the user apply
an empirically derived RMS error metric, to the perfect coordinate database,
generating a representative, as found, surface?   

Then, based on the real, "lumpy" surface, generate beam patterns, for
a given frequency.  It would be interesting to see Jamesburg's real pattern,
both at C band, it's designed frequency, and then pushing it to higher
frequencies, say, X band, and see how the pattern degrades, based on an RMS
error which we determined to be in the vicinity of .050"





All the best,

Pat Barthelow   (916) 315-9271; aa6eg at k6bj.org

Jamesburg Moonbounce




 Team

http://www.jamesburgdish.org

http://www.greatdanepro.com/Blue%20Bueaty/index.htm



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