Elliptical array using conformalArray function along with the reflector backing is giving error, what could be the reason?

Question

Biplob 2023-6-5

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https://ww2.mathworks.cn/matlabcentral/answers/1978309-elliptical-array-using-conformalarray-function-along-with-the-reflector-backing-is-giving-error-wha

编辑： Pranavkumar Mallela 2023-7-27

Hi,

I am trying to desing an elliptical array, with dipole as array elements with reflector. The show(array) is showing me the geometry of the design, but when I plot the pattern(array,f0), then I am getting error: "Intersection detected in specified geometry."

Attaching the code for your reference.

MATLAB CODE:

%% Design Parameters

f0 = 2.4e9;

c = 3e9;

lam0 = c/f0;

N = 8;

e = 0.5;

ra = 0.05;

rat = sqrt(1-e^2);

rb = ra*rat;

l = 2;

%% Dipole Parameters

dip = dipole;

dip.Length = 0.058709;

dip.Width = 0.0012491;

%% Refelector Parameters

GndPlanelength = 200e-3;

GndPlaneWidth = 200e-3;

r = reflector;

r.Exciter = dip;

r.Spacing = lam0/4;

r.GroundPlaneLength = GndPlanelength;

r.GroundPlaneWidth = GndPlaneWidth;

%% Feed Locations

for n = 1: N

X(n) = ra*rb*cos(2*pi*(n-1)/N)/(sqrt(ra^2*(sin(2*pi*(n-1)/N))^2 + rb^2*(cos(2*pi*(n-1)/N))^2));

Y(n) = ra*rb*sin(2*pi*(n-1)/N)/(sqrt(ra^2*(sin(2*pi*(n-1)/N))^2 + rb^2*(cos(2*pi*(n-1)/N))^2));

pos(n,:) = [X(n) Y(n) lam0/4];

end

%% Feed Phase

phs_element = NaN(N,1);

for n = 1 : N

phs_element(n,:) = (2*pi*n*l/N)*(180/pi);

amp_taper(n,:) = 1;

end

%% Array Parameters

arr = conformalArray;

arr.Element = r;

arr.ElementPosition = pos;

arr.PhaseShift = phs_element;

arr.AmplitudeTaper = amp_taper;

%% Show antenna

figure

show(arr)

%% Antenna Pattern

figure

pattern(arr,f0);

Error using em.EmStructures/checkIntersection
Intersection detected in specified geometry.

Error in conformalArray/meshGenerator (line 417)
checkIntersection(obj);

Error in em.MeshGeometry/updateMesh

Error in em.MeshGeometry/getMesh

Error in em.EmStructures/analyze

Error in em.FieldAnalysisWithFeed/pattern (line 177)
analyze(obj,frequency,ElemNumber,parseobj.Results.Termination);

Thank You,

Biplob Biswas

PhD Research Scholar

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Answer 1

Pranavkumar Mallela 2023-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/1978309-elliptical-array-using-conformalarray-function-along-with-the-reflector-backing-is-giving-error-wha#answer_1268373

编辑：Pranavkumar Mallela 2023-7-27

在 MATLAB Online 中打开

Hi,

As per my understanding, you are trying to create an elliptical array using the 'conformalArray' function with reflector backing.

While using backing, it is preferred to set the 'Reference' property to the value 'origin' instead of the default value 'feed' in the constructor of 'conformalArray'. This will allow one to catch any intersections in the geometry.

Please find the edited part of the code below:

%% Array Parameters
arr = conformalArray('Reference', 'origin');
arr.Element = r;
arr.ElementPosition = pos;
arr.PhaseShift = phs_element;
arr.AmplitudeTaper = amp_taper;