Paul Christensen wrote:
> I am looking for any type of computational tool that will allow me to
> quickly look at the terminal Z of a dipole in free space where I can change
> its wavelength from 0.25 to say...approximately 7 wavelengths.
>
> Anything like that available without getting into antenna modeling software?
>
>
Do you need an equation? or a table lookup? or a callable subroutine?
If you have matlab, or can translate matlab into your language of
choice, Orfanidis's on-line electromagnetics text book has some matlab
procedures that will give you feedpoint Z of arbitrary dipoles, using
King's approximation. You give length and diameter, and it gives you Z.
Somewhere around I have a excel spreadsheet with Z for 0.1 to 2.5
wavelengths of a 10 meter long dipole using 1mm diameter conductors in
steps of 0.05 wavelength. I could regenerate it if needed for a longer
range or finer steps.
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