MATLAB: Antenna plot in 3D

3d plotsantenna arrayantenna patternarray factor

Can someone know what is wrong in my code? I adjust values (C,D,E,Ep,JpI) according the size [360×180] of matrices PHI and THETA. My task is to draw R (in may case this is array factor) in 3D space.
My code:
clear all;
close all
dbstop if error
V1=0; A1=0; C=0;
V2=0; A2=0; D=0;
V3=0; A3=0; E=0;
Ep=0; AnI=0; JpI=0;
R=0;
% number of elements N, wavenumber B
N = 3; %Number of elemnts in array
B = 0.14;   %B =(2*pi/lambda), wavenumber
% Magnitude, Phase, X,Y,Z coordinate
An = [2 2 2]; %Magnitude of 1st, 2nd and 3rd,...Nth element
Jp = [120 90 60]; %Phase of 1st, 2nd and 3rd,...Nth  element
Xn = [1 2 3]; % Position of 1st, 2nd and 3rd,...Nth  element on X-axis
Yn = [1 2 3]; % Position of 1st, 2nd and 3rd,...Nth  element on Y-axis
Zn = [1 2 3]; % Position of 1st, 2nd and 3rd,...Nth  element on Z-axis
%Azimut--> 0<Phi<360, Elevation--> 0<Theta<180
Phi = (1:1:360)*pi/180; %azimuth
Theta = (1:1:180)*pi/180; %elevation
[THETA,PHI] = meshgrid(Theta,Phi);
% calculate the array factor 
%size(THETA)
%length(THETA)
%convert vector [1x3] into matrix [360x180]     C = Xn .* sin(THETA) .* cos(PHI);
V1 = repmat(Xn,360,60);
A1 = sin(THETA) .* cos(PHI);
C = A1.*V1;
%convert vector [1x3] into matrix [360x180]      D = Yn * sin(THETA) * sin(PHI);
V2 = repmat(Yn,360,60);
A2 = sin(THETA) .* sin(PHI);
D = A2.*V2;
%convert vector [1x3] into matrix [360x180]        E = Zn * cos(THETA);
V3 = repmat(Zn,360,60);
A3 = cos(THETA);
E = A3.*V3;
Ep = B.*(C+D+E);
%convert degree into radian
Jp = (Jp.*pi)/180;
%sum velues in vector An, convert vector Jp [1x3] into matrix [360x180]
AnI = sum(An);
JpI = repmat(Jp,360,60);
R = AnI.*exp(1i.*(Ep + JpI)); %Equation for array factor
%h(PHI, THETA) = R;
%AF(PHI, THETA) = abs(h(PHI, THETA));
%plot the array factor
X = R.*sin(THETA).*cos(PHI); 
Y = R.*sin(THETA).*sin(PHI);
Z = R.*cos(THETA);
figure();  
mesh(X,Y,Z); %display
surf(X,Y,Z) %colored faces
title('Polar plot in 3D space')
xlabel('x-axis')
ylabel('y-axis')
zlabel('z-axis')
Best regards, Tadej

Best Answer

I have found out. R has a complex values, so I just add R = abs®;
Greetings, Tadej
Related Question