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Planning a 5G Fixed Wireless Access Link over Terrain - Not run

조회 수: 7 (최근 30일)
Shahar ben ezra
Shahar ben ezra 2022년 8월 12일
댓글: Satyanand Singh 2023년 4월 11일
Hi
I am running the original code of the MATLAB website
https://ch.mathworks.com/help/antenna/ug/planning-a-5G-fixed-wireless-access-link-over-terrain.html
And in the next part I get an error message:
% Design reflector-backed crossed dipole antenna
txElement = reflectorCrossedDipoleElement(fq); % this is not run
% Define array size
ntxrow = 8;
ntxcol = 12;
% Define element spacing
lambda = physconst("lightspeed")/fq;
drow = lambda/2;
dcol = lambda/2;
% Create 8-by-12 antenna array
tx.Antenna = phased.URA("Size",[ntxrow ntxcol], ...
"Element",txElement, ...
"ElementSpacing",[drow dcol]);
% Plot pattern on the map
pattern(tx)
Undefined function 'reflectorDipoleElement' for input
arguments of type 'double'.
Error in pop3 (line 60)
rxElement = reflectorDipoleElement(fq);
Am I missing TOOLBOX or why doesn't it work?
TNX
  댓글 수: 1
Satyanand Singh
Satyanand Singh 2023년 4월 11일
function element = reflectorCrossedDipoleElement(fq, showAntenna)
%reflectorCrossedDipoleElement Design reflector-backed crossed dipole antenna element
if nargin < 2
showAntenna = false;
end
lambda = physconst("lightspeed")/fq;
offset = lambda/50;
gndspacing = lambda/4;
gndLength = lambda;
gndWidth = lambda;
% Design crossed dipole elements
d1 = design(dipole,fq);
d1.Tilt = [90,-45];
d1.TiltAxis = ["y","z"];
d2 = copy(d1);
d2.Tilt = 45;
d2.TiltAxis = "x";
% Design reflector
r = design(reflector,fq);
r.Exciter = d1;
r.GroundPlaneLength = gndLength;
r.GroundPlaneWidth = gndWidth;
r.Spacing = gndspacing;
r.Tilt = 90;
r.TiltAxis = "y";
if showAntenna
show(r)
end
% Form the crossed dipole backed by reflector
refarray = conformalArray;
refarray.ElementPosition(1,:) = [gndspacing 0 0];
refarray.ElementPosition(2,:) = [gndspacing+offset 0 0];
refarray.Element = {r, d2};
refarray.Reference = "feed";
refarray.PhaseShift = [0 90];
if showAntenna
show(refarray);
view(65,20)
end
% Create custom antenna element from pattern
[g,az,el] = pattern(refarray,fq);
element = phased.CustomAntennaElement;
element.AzimuthAngles = az;
element.ElevationAngles = el;
element.MagnitudePattern = g;
element.PhasePattern = zeros(size(g));
end
function element = reflectorDipoleElement(fq)
%reflectorDipoleElement Design reflector-backed dipole antenna element
% Design reflector and exciter, which is vertical dipole by default
element = design(reflector,fq);
element.Exciter = design(element.Exciter,fq);
% Tilt antenna element to radiate in xy-plane, with boresight along x-axis
element.Tilt = 90;
element.TiltAxis = "y";
element.Exciter.Tilt = 90;
element.Exciter.TiltAxis = "y";
end

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답변 (1개)

Abderrahim. B
Abderrahim. B 2022년 8월 12일
편집: Abderrahim. B 2022년 8월 12일
Hi!
reflectorDipoleElement is a function in your live script. Scroll down to the bottom of the script and see if it is there, maybe it has a different name!
Edit:
I have run the same example, and it worked for me. I am using MATLAB 2022A, latest update.
Some tips to fix the error:
  • Check fq data type
  • Do some debugging
  • Check if you have antenna toolbox, and all the other required products
Hope this helps

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