This is comparing a monopole over perfect ground to a dipole in
free space. It is well known fact that is in virtually any
text on antennas. It is irrelevant to us, because we are not
talking about vertical dipoles in free space, but rather over
ground, which is not perfect BTW.
Rick N6RK
Rob Atkinson wrote:
> More important is the comparison between vertical monopoles and
> vertical dipoles. See this paper by Gandhi, Lazzi and Furse. Note
> especially the paragraph following equation 1:
>
> http://www.ece.utah.edu/~ece3300/Labs/lab3/MONOPOLE ANTENNAS.pdf
>
> The pertinent statement is that a monopole has twice the power density
> of a dipole. "....this gives a directivity or gain of the monopole
> antenna that is twice that for the double-length dipole."
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