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Satellite Dish curvature

  1. Feb 12, 2015 #1
    How can I mathematically determine curvature for a satellite dish for a specific radio wavelength?
     
  2. jcsd
  3. Feb 12, 2015 #2

    DrClaude

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    Staff: Mentor

    It has nothing to do with the wavelength. And the fact that they are actually called parabolic antennas should give you a clue as to their curvature ;)
     
  4. Feb 12, 2015 #3

    davenn

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    Science Advisor
    Gold Member

    As DrClaude said it isn't frequency related
    The curvature amount determines the focal point location
    eg.
    http://www.satsig.net/focal-length-parabolic-dish.htm

    EDIT:
    The physical size --- diameter of the dish will affect the gain at a given wavelength ( frequency)
    eg say a dish of 2 metres diameter is going to have much more gain at 10 GHz (3cm wavelength) than it is at 5GHz ( 6cm wavelength)

    that 2 metre dish is going to have very low gain at 144MHz ( 2 metre wavelength) and even worse as the wavelength becomes significantly larger than the size of the dish


    cheers
    Dave
     
  5. Feb 12, 2015 #4
    OK, thank you.
     
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