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Matlab help needed contour plot

  1. Sep 24, 2012 #1
    1. The problem statement, all variables and given/known data

    I need to plot an electric field in some range around base station, for example in range of 200m.

    EIRP=57,5dBm
    G=1 for the first example
    N=4


    2. Relevant equations

    E=[2*sqrt(30*N*P*G)]/r
    P=10exp[(EIRP-30)/10]
    EIRP=57,5dBm
    G=1 for the first example
    N=4


    3. The attempt at a solution


    [X,Y] = meshgrid(-200:.50:200,-200:.50:200);
    E=520./sqrt(X.^2+Y.^2);
    contour(X,Y,E);

    so when i calculate the numerator it's around 520 so i just placed it directly, and in the denominator part i placed sqrt(X.^2+Y.^2) so it's the result for any distance from the station in this range from 0 to 200...the result i get is not good, i used contour plot, i'm really not that familiar with plotting in matlab so this is the first option i thought will work (maybe there are better options?)...in the attached file i made a snapshot of my result and the result of some other example...my result should look something like that...

    I would appreciate any help very much...Thanks!
     

    Attached Files:

  2. jcsd
  3. Sep 24, 2012 #2
    and also i should include G (gain) in the equation so it all don't come out symetric but i got no idea how should i do it...
     
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