Plotting Radiation Pattern in 3D (in dB)

The issue is that the log of the cosine creates complex values that cannot be plotted (I do not wish to plot these values either). How should I fix the above code?

I also have access to patternCustom in the antenna toolbox but I am unsure how to use it.

Thank you for your time, help, and advice.

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Prahlad Gowtham Katte 2022-2-14

编辑：Prahlad Gowtham Katte 2022-2-14

在 MATLAB Online 中打开

Hello @Jon Ho

I tried the following piece of code in MATLAB R2021b

theta = linspace(-pi/2+0.1,pi/2-0.1);

phi = linspace(0,2*pi);

rho = 10.*log10((cos(theta)).^9) + 30;

patternCustom(rho,theta,phi);

I got the above figure as output.If the problem is not yet solved , please tell the version of MATLAB which you are using currently.

Mathieu NOE 2022-2-14

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helo

I simply added an abs to your code to avoid taking the log of negative data but I'm unsure this is making sense...

theta = linspace(-pi/2, pi/2,100);
 phi = linspace(0, pi,100);
 [phi, theta] = meshgrid(phi, theta);
 rho = 10.*log10(abs((cos(phi)).^9)) + 30; % <= here
 [x,y,z] = sph2cart(phi, theta, rho);
 mesh(x,y,z);