2D or 3D from CST to matlab

i work withh pattern function in matlab but i can get the result and only get err i dont know i can use it or not?

i get text from cst like it for 2D

Theta [deg.]  Phi   [deg.]  Abs(Grlz)[dBi   ]   Abs(Theta)[dBi   ]  Phase(Theta)[deg.]  Abs(Phi  )[dBi   ]  Phase(Phi  )[deg.]  Ax.Ratio[dB    ]    
------------------------------------------------------------------------------------------------------------------------------------------------------

-180.000          90.000           -9.255e+00          -1.298e+01             149.214          -1.165e+01              26.420           5.450e+00     
-179.900          90.000           -9.239e+00          -1.295e+01             148.947          -1.165e+01              26.368           5.407e+00     
-179.800          90.000           -9.224e+00          -1.292e+01             148.681          -1.164e+01              26.315           5.364e+00     
-179.700          90.000           -9.208e+00          -1.289e+01             148.418          -1.163e+01              26.263           5.321e+00     
.
.
.
 179.600          90.000           -9.319e+00          -1.309e+01             150.304          -1.168e+01              26.638           5.627e+00     
 179.700          90.000           -9.303e+00          -1.306e+01             150.029          -1.168e+01              26.584           5.582e+00     
 179.800          90.000           -9.287e+00          -1.303e+01             149.755          -1.167e+01              26.530           5.537e+00     
 179.900          90.000           -9.271e+00          -1.300e+01             149.484          -1.166e+01              26.477           5.493e+00     

in above table i only use first three column which means i like to have pattern in constant phi with various theta

in cst i get this pattern and i want get it in matlab

or about 3d

 Theta [deg.]  Phi   [deg.]  Abs(Grlz)[dBi   ]   Abs(Theta)[dBi   ]  Phase(Theta)[deg.]  Abs(Phi  )[dBi   ]  Phase(Phi  )[deg.]  Ax.Ratio[dB    ]    
------------------------------------------------------------------------------------------------------------------------------------------------------
-180.000         -90.000           -9.255e+00          -1.298e+01             329.214          -1.165e+01             206.420           5.450e+00     
-175.000         -90.000           -1.014e+01          -1.456e+01             345.709          -1.209e+01             209.583           8.372e+00     
-170.000         -90.000           -1.106e+01          -1.607e+01              10.515          -1.271e+01             214.066           1.431e+01     
.
.
.
 170.000         -85.000           -8.273e+00          -1.118e+01             315.069          -1.139e+01             209.010           2.476e+00     
 175.000         -85.000           -8.594e+00          -1.155e+01             323.022          -1.166e+01             209.504           3.672e+00     
.
.
 -180.000         -80.000           -9.255e+00          -1.209e+01             338.042          -1.245e+01             214.316           5.450e+00     
-175.000         -80.000           -1.012e+01          -1.327e+01             353.629          -1.299e+01             213.416           8.835e+00     
-170.000         -80.000           -1.082e+01          -1.409e+01              16.458          -1.358e+01             212.867           1.684e+01     
.
.
 160.000          90.000           -1.153e+01          -1.477e+01             248.847          -1.431e+01              48.753           1.504e+01     
 165.000          90.000           -1.162e+01          -1.622e+01             221.795          -1.347e+01              40.323           3.825e+01     
 170.000          90.000           -1.106e+01          -1.607e+01             190.515          -1.271e+01              34.066           1.431e+01     
 175.000          90.000           -1.014e+01          -1.456e+01             165.709          -1.209e+01              29.583           8.372e+00   

is it posssible to get them from matlab with patten func or other way

[Umar]

Hi @koorosh dastan,

Based on the data you provided, it is indeed possible to obtain the patterns in MATLAB using the pattern function. Let me first address the 2D pattern. From the table you provided, it seems that you are interested in obtaining the pattern for a constant phi (azimuth) angle with varying theta (elevation) angles. To achieve this, you can extract the relevant columns from the table and use them as input to the pattern function. Here's an example code snippet that demonstrates how to obtain the 2D

% Extract the relevant columns from the table

theta = table(:, 1);

abs_grlz = table(:, 3);

% Convert the amplitude data to linear scale

abs_grlz_linear = 10.^(abs_grlz/10);

% Plot the 2D pattern

pattern(theta, abs_grlz_linear);

In the code snippet above, table represents the table of data you provided and then it extracts the theta values from the first column and the amplitude values (Abs(Grlz)) from the third column. Since the amplitude values are given in decibels (dB), convert them to linear scale using the formula 10.^(abs_grlz/10). Finally, use the pattern function to plot the 2D pattern.

Now, let's move on to the 3D pattern. The table you provided contains data for various theta and phi angles. To obtain the 3D pattern, you can use the same approach as before, but this time you need to consider both the theta and phi angles. Here's an example code snippet that demonstrates how to obtain the 3D pattern using the pattern function in MATLAB:

% Extract the relevant columns from the table

theta = table(:, 1);

phi = table(:, 2);

abs_grlz = table(:, 4);

% Convert the amplitude data to linear scale

abs_grlz_linear = 10.^(abs_grlz/10);

% Plot the 3D pattern

pattern(theta, phi, abs_grlz_linear);

In the code snippet above, extract the theta values from the first column, the phi values from the second column, and the amplitude values (Abs(Grlz)) from the fourth column of the table and then convert the amplitude values to linear scale and then use the pattern function to plot the 3D pattern. I hope this answers your question. Please let me know if you have any further questions.

[Harald]

When running this suggested code, I get the error message

Error using pattern

Too many input arguments.

[Umar]

Hi @Harald,

To resolve this error, I will make ensure that you are passing the correct number of arguments to the pattern function. Thanks for your contribution and helping out.

Answer 1

[Harald]

Hi,

for 2D, I would recommend using polarplot:

polarplot(data(:,1), data(:,3))

If you want to separate by Phi, you can use logical indexing to extract the desired data, e.g.

selected = data(:,2) == 90;
polarplot(data(selected,1), data(selected,3))

and then use a loop.

For 3D, I am not aware of an out-of-the-box function. There have been questions around this with different answers, e.g.

https://www.mathworks.com/matlabcentral/answers/356232-how-can-i-plot-3d-polar-plot-in-matlab

https://www.mathworks.com/matlabcentral/answers/1728540-3d-polar-plot

Also, you may find File Exchange submissions like these to be helpful:

https://www.mathworks.com/matlabcentral/fileexchange/13200-3d-polar-plot

Best wishes,

Harald

[koorosh dastan]

thx for your helps

this code get me similar chape like cst

some line like transpose dont need

data = load("a1.txt");

ff=data(:,1);

gg=ff.';

normalized_angles_deg = gg;

angles_rad = normalized_angles_deg * pi / 180;

ii=data(:,3);

hh=ii.';
polarplot(angles_rad,hh )

ax = gca;
ax.RLim = [-15, 10]; % Set radius limits to suitable dB range
ax.RTick = -15:5:5; % Set appropriate dB ticks

ax.ThetaTick = 0:30:315; % Set theta ticks
ax.ThetaZeroLocation = 'top'; % Set 0 degrees to the top (default is 'right')
grid on;