Export radiation pattern to stl

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Anne
Anne 2021-2-16
编辑： DGM 2025-9-27，8:29
Hey there,
I try to export a radiation pattern (3D) in the .stl format. That's my code:
fc = 62e9;
pm = design(patchMicrostrip, fc);
pattern(pm, fc);
Now it would be great to export this pattern as .stl or something similar. I'll be greatful for every idea or hint.
Thanks in advance!
  1 个评论
Anne
Anne 2021-2-17
编辑：Anne 2021-2-17
I thought about (and tried them):
> stlwrite (part of the antenna package), which needs a triangulation object as input, but i couldn't find a way to convert the 3D-pattern to a triangulation object
> surf2stl (https://uk.mathworks.com/matlabcentral/fileexchange/4512-surf2stl), which needs a Surface as input.
h = gcf;
get(h)
children = h.Children
axChild = children(6).Children
This shows me that "Axes" has a Child of type Surface. I can export this to an stl without problems, but it's just a sphere. So there has to be some information missing.
Thanks in advance for any helpfull idea!

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回答（2 个）

Sai Kiran
Sai Kiran 2022-12-21
Hi,
Please follow the steps below to export the 3D radiation pattern to .stl format.
[D,A,E]=pattern(pm,fc)
where D is the Directivity, A is an array of azimuth angle and E is an array of elevation angle.
[A,E]=meshgrid(A,E);
Download the surf2stl function from the below link.
surf2stl - File Exchange - MATLAB Central (mathworks.com)
surf2stl('filename.stl',D,A,E);
The resultant stl file contains the 3D radiation pattern.
I hope it resolves your query.
DGM
DGM 2025-7-14
编辑：DGM 2025-9-27，8:29
Ran in:
Let's go the rest of the way.
% let's say we have the pattern data
l = linearArray;
[D A E] = pattern(l,70e6);
% yeah, we're gonna need to expand
[A E] = meshgrid(A,E);
% but we also need to change to cartesian
% note the change of units and the shift on D
[X Y Z] = sph2cart(deg2rad(A),deg2rad(E),D - min(D(:)));
% now the data is in a form that can be accepted by surf() or surf2stl()
hs = surf(X,Y,Z); axis equal
% but we really don't need to use surf2stl() if we don't want to
[F,V] = surf2patch(hs,'triangles'); % the 'triangles' option is needed
T = triangulation(F,V); % now we can just write it like any STL
stlwrite(T,'test.stl')
% for show and tell, let's just read it back and show it
T = stlread('test.stl');
figure
trisurf(T,'facecolor',[1 1 1]*0.8,'edgecolor','none')
view(3); view(-40,33); camlight;
axis equal; grid on
As an aside, trying to learn toolboxes I don't even have, while in the confines of the forum editor is really a cumbersome feeling.
See also:
https://www.mathworks.com/matlabcentral/answers/501620-how-to-save-the-result-of-stlwrite-to-a-specific-directory-chosen-by-the-user#comment_3341828

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