Magnus Danielson wrote:
On 10/08/2010 08:22 PM, jimlux wrote:
B
You might do just as well with a flat cookie sheet.
Well, a 1 m dish gives you 48 dB gain at L1 if I calculate correctly.
I don't think so..48dBi would be huge...A numerical gain of 48 I can
believe:
let's say we have an antenna that is 2x3 wavelengths (40x60cm, 1.5 GHz
= 20 cm) or 6 square wavelengths. the gain is 4 pi * A, or about 75.
But in reality, the efficiency is typically no better than 50% (because
of sidelobes, illumination, etc.)... Call 66% to be sporty, and you've
got a numerical gain of 50, or 17dBi.
The normal antenna is at 6 db of antenna gain?
Even if less than perfect, not too big size is needed to get meaningful
antenna gain.
Cheers,
M
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