Getting the complex antenna response in the antenna library?

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Yubei Xiong 2019-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/462322-getting-the-complex-antenna-response-in-the-antenna-library

评论： Yubei Xiong 2019-5-27

Is there a way of getting the complex antenna response (e-field magnitude as well as its phase) using the antenna library? This is possible with the phased library, by doing

aresp = phased.ArrayResponse('SensorArray',h);
resp = complex(zeros(181,361));
az = -180:1:180;
el = -90:1:90;
for m = 1:181
    resp(m,:) = aresp(fc,[az;el(m)*ones(1,361)]);
end

And I can then obtain the phase of the radiated field. Is there something that allows me to do the same thing in the antenna library?

Thanks.

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Answer 1

Honglei Chen 2019-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/462322-getting-the-complex-antenna-response-in-the-antenna-library#answer_375314

在 MATLAB Online 中打开

Is this what you mean?

https://www.mathworks.com/help/antenna/ref/ehfields.html

Or alternatively, if you want it to be in far field with input as an angle, you can always do

aresp = phased.ArrayResponse('SensorArray',phased.ConformalArray('Element',elem));
resp = complex(zeros(181,361));
az = -180:1:180;
el = -90:1:90;
for m = 1:181
    resp(m,:) = aresp(fc,[az;el(m)*ones(1,361)]);
end

where elem is the element.

HTH

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Yubei Xiong 2019-5-16

编辑：Yubei Xiong 2019-5-16

在 MATLAB Online 中打开

Thanks for the reference! I think this could help but in fact i am trying to get the antenna field repsonse, which is something that could be generated by this:

pattern(antenna,fc,'Type','efield');

but it only gives the magnitude of the field whereas I need both of its magnitude and its phase. Would you know how I could get the field phase and generate its pattern?

Currently, I am trying to do this by the ehfields which you have suggested, but the result does not match the magnitude pattern generated by the pattern call. It would be appreciated if someone could give me some directions / correct me if I did something wrong here.

% generate pattern corresponding to a desired AZEL mesh
AZ = -180:10:180;  % length N
EL = -90:5:90;     % length M
[AZ_,EL_] = meshgrid(deg2rad(AZ),deg2rad(EL));
[X,Y,Z] = sph2cart(AZ_,EL_,1);
p = [X(:)';Y(:)';Z(:)'];
[e,h] = EHfields(antenna,fc,p);
% combine XYZ fields
efield = zeros(1,size(e,2));
for j = 1:size(e,2)
    efield(j) = sum(e(:,j)) ;
end
% convert data to N by M matrix 
efieldGrid = vec2mat(efield,length(EL));
% plot custom pattern
phi = AZ';
theta = 90-EL;
figure(1)
subplot(1,2,1)
patternCustom(abs(efieldGrid),theta,phi,...
            'CoordinateSystem','polar');
title('Efield Magnitude Pattern');
subplot(1,2,2)
patternCustom(angle(efieldGrid),theta,phi,...
            'CoordinateSystem','polar');
title('Efield Phase Pattern');

I got this for a dipole antenna, which is clearly incorrect.

Thanks

Honglei Chen 2019-5-17

Have you tried my alternative code? That should give you both magnitude and phase. Does that help?

Yubei Xiong 2019-5-27

The code you gave was based on the phased library. My question is to ask how I could do the same thing in the antenna library.

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