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yungman
#5
Jan10-13, 12:35 AM
P: 3,883
Quote Quote by haruspex View Post
Are you sure about that? It doesn't seem right to me.
yungman, is it possible that HPBW is to be interpreted as a square, not a circle?
It kind of make sense as the surface is concave and you have the max reflection at the center of the planet where the surface is true normal to the propagation. But as I said, the equation don't reflect this, all it gave was the ratio of the two solid angle where there is no reason for the π/4 to appear.

That I am pretty sure, the main lope a very directional antenna is like a long balloon or sausage!!! But still don't explain the pi/4 even if you look at it as square.