On Tuesday 11 August 2009 12:57:42 pm Rudy Severns wrote:
> There is a very nice book on arrays, "M.T. Ma, Theory and Application of
> Antenna Arrays, Wiley-Interscience, 1974".
I also recommend this book.
Ma's book has a discussion of calculating the optimum directivity from an
arbitrary
array by adjusting the element currents and phases. I was able to translate
the math into a script that runs on GNU Octave. You feed the script a
description
of an array, and it calculates the elements current and phases for optimum
directivity. Then you retype all of that into NEC to prove that it really
works.
I translated the Octave script into some C code that calls the GNU scientific
library (which is probably what Octave is layered upon) and then calls GNUplot
to plot the pattern. The pattern plots (calculated in only 2 dimensions by
assuming omni-directional elements) work out to be pretty close to what you
get from NEC.
I suppose I could post the program to Google code if anyone wants a look.
Victor, K1LT
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