Actual height of Fresnel forbidden zone - distance between line and elipse

1. Aug 9, 2012

tblues87

Hi
I'm new here so I don't know if I posted in right place but here is the problem.

I don't know if you are familiar with antenna theory but I need to calculate radius of 1. Fresnel ellipsoid. It's easy when two antennas are on same altitude but if they aren't there is a problem.

If you look the picture in attachment you will see that I need to calculate height h.
I won't give you and numbers because I need calculation for various cases but here are known variables:

ht - height of first antenna
hr - height of second antenna
Dtr - distance between antennas
D - distance between first antenna and point where h needs to be calculated
r - radius of 1. Fresnel ellipsoid on distance D

r=sqrt((λ*d1*d2)/(d1+d2))
λ=f/c

f - frequency
c - speed of light

These are all known numbers for various cases and for each of them I need to calculate h

Thank you very much.

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