Plotting antenna field patterns in spherical coordinates

Question

Rhiannon 2011-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/12125-plotting-antenna-field-patterns-in-spherical-coordinates

回答： Vishwanath Iyer 2021-6-3

Hi, I have a 2D array which of the form A(theta, phi) and I want to plot A as a 3D surface. I have read advice which suggests to use the sph2cart function to convert to Cartesian coordinates, then use surf or mesh, but as size(A) = 46 90, i.e. it is not a square 2D array, it will not work. Any suggestions? Thanks

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Answer 1

Kelly Kearney 2011-7-21

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Why do you think your array needs to be square? Mesh, surf, etc. will accept any gridded data. Assuming your A values represent the radius at any given theta and phi:

 theta = linspace(0, pi, 90);
 phi = linspace(0, 2*pi, 46);
 [theta, phi] = meshgrid(theta, phi);
 A = ones(size(theta));
 [x,y,z] = sph2cart(theta, phi, A);
 mesh(x,y,z)

Is this what you're after?

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Rhiannon 2011-7-21

Exactly what I was after. I was getting error messages when I was using sph2cart, and I assumed it was because I didnt have a square array, but it must have been something else.

Thank you

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