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

  1. Aug 9, 2012 #1
    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.
     

    Attached Files:

  2. jcsd
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