How to calculate array factor of UNIFORM CIRCULAR ARRAY or CONCENTRIC CIRCULAR ARRAY?

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FARHA KHAN 2021-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/1588914-how-to-calculate-array-factor-of-uniform-circular-array-or-concentric-circular-array

评论： FARHA KHAN 2021-12-28

How can I calculate the array factor of uniform circular array OR concentric circular array in matlab at az=0 ele=0?

% MATLAB Code from Sensor Array Analyzer App
% Generated by MATLAB 9.10 and Phased Array System Toolbox 4.5
% Generated on 22-Jul-2021 11:49:37
% Create a concentric array
close all
shift = 0;
l2=0
l4=1
% The multiplication factor for lambda units to meter conversion
radius = [0.5 1] * 0.0105263157894737;
n = [4 8];
if length(n) == 1
    n = n*ones(1, length(radius));
end
Nelements = sum(n);
stop = cumsum(n);
start = stop - n + 1;
actual_pos = zeros(3, Nelements);
for idx = 1:length(n)
    angles = (0:n(idx)-1)*360/n(idx);
    angles = angles + shift;
    shift = sum(angles(1:2))/2;
    pos = [zeros(1, length(angles));cosd(angles);sind(angles)];
    actual_pos(:, start(idx):stop(idx)) = pos*radius(idx);
end
elNormal = [ones(1,Nelements);zeros(1,Nelements)];
Array = phased.ConformalArray('ElementPosition', actual_pos, ...
    'ElementNormal', elNormal,'Taper',[exp(i*l2*0) exp(i*l2*1.5707) exp(i*l2*3.1415) exp(i*l2*4.7123) exp(i*l4*0) exp(i*l4*0.7853) exp(i*l4*1.5707) exp(i*l4*2.356) exp(i*l4*3.1415) exp(i*l4*3.9269) exp(i*l4*4.7123) exp(i*l4*5.4977)]);
% Create an isotropic antenna element
Elem = phased.IsotropicAntennaElement;
Elem.FrequencyRange = [0 28500000000];
Array.Element = Elem;
% Assign Frequencies and Propagation Speed
Frequency = 28500000000;
PropagationSpeed = 300000000;
% Create Figure
% Plot Array Geometry
figure;
viewArray(Array,'ShowNormal',false,...
    'ShowTaper',false,'ShowIndex','None');
% Calculate Steering Weights
Freq3D = 28500000000;
% Find the weights
w = ones(getNumElements(Array), length(Frequency));
% Plot 3d graph
format = 'polar';
figure;
pattern(Array, Freq3D , 'PropagationSpeed', PropagationSpeed,...
    'Type','directivity', 'CoordinateSystem', format,'weights', w(:,1));
u=pattern(Array, Freq3D , 'PropagationSpeed', PropagationSpeed,...
    'Type','directivity', 'CoordinateSystem', format,'weights', w(:,1));
% Find the weights
w = ones(getNumElements(Array), length(Frequency));
% Plot 2d elevation graph
format = 'polar';
cutAngle = 0;
figure;
pattern(Array, Frequency, cutAngle, -90:90, 'PropagationSpeed', PropagationSpeed,...
    'Type', 'directivity', 'CoordinateSystem', format ,'weights', w);
format = 'rectangular';
cutAngle = 0;
figure;
pattern(Array, Frequency, cutAngle, -90:90, 'PropagationSpeed', PropagationSpeed,...
    'Type', 'directivity', 'CoordinateSystem', format ,'weights', w);