1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

  1. Aug 9, 2012 #1
    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


    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted