replotting radiation pattern from its txt form

Hello ,I have as simple patch antenna with a radiation pattern shown in the attached photo.

i have its TXT form in the attached txt file called "data_rad.txt"

how can i recreate this plot from the TXT file in matlab.

Thanks

[ali]

hi did you find the solution ?? I need help too :)

[Shashank Kulkarni]

Try the patternCustom function in Antenna Toolbox

https://in.mathworks.com/help/antenna/ref/patterncustom.html

Answer 1

[Mathieu NOE]

hello

maybe this ? nothing fancy but I just figure out your reference image and the usual elevation angle convention (which is the one used in matlab function sph2cart) differs by a shift of pi/2.

the sphere radius is supposed to be 1 (no data found on this matter).

if you want a smooth sphere plot without the edges see fig 3

filename = "data_rad.txt ";
data = readmatrix(filename,'NumHeaderLines',2); % or readtable or whatever you prefer
% Theta [deg.]  Phi   [deg.]  Abs(Dir.)[dBi   ]   Abs(Theta)[dBi   ]  Phase(Theta)[deg.]  Abs(Phi  )[dBi   ]  Phase(Phi  )[deg.]  Ax.Ratio[dB    ]    

theta = data(:,1)*pi/180; % elevation in radians
theta = pi/2-theta; % /!\ onvention change (from image convention to usual elevation angle convention ,also as per matlab fn)

phi = data(:,2)*pi/180; % azimuth in radians

Ad = data(:,3); % Abs(Dir.)[dBi] 

% Convert to Cartesian coordinates
[x, y, z] = sph2cart(phi, theta, 1);  %  (azimuth TH, elevation PHI, radius R)

figure(1)
scatter3(x,y,z,20,Ad,'filled');
xlabel('X')
ylabel('Y')
zlabel('Z')
axis equal
colormap('jet');
colorbar

figure(2) 
tri = convhull([x y z]);  % triangle connectivity matrix (could be also
% obtained with delaunay) - but since it's a sphere, I think convhull is better suited.
% tri = delaunay([x y z]);  % triangle connectivity matrix (could be also obtained with delaunay)

trisurf(tri,x,y,z,Ad,'facecolor','interp');
xlabel('X')
ylabel('Y')
zlabel('Z')
axis equal
colormap('jet');
colorbar

figure(3) 
trisurf(tri,x,y,z,Ad,'facecolor','interp','edgecolor','none');
xlabel('X')
ylabel('Y')
zlabel('Z')
axis equal
colormap('jet');
colorbar