Mutual coupling in antenna array

Question

Tony Carl 2018-12-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436305-mutual-coupling-in-antenna-array

Hi all,

I'm trying to get the voltage distribution of the entire antenna array under specific excitation pattern when mutual coupling is taken into account.

However, I'm not sure about the results I've got from my program, below are the steps and results:

(1)Array geometry and working condition

1 transmit (top-left corner) and 3 receive elements arranged rectangular, spacing 0.5 * lambda in x/y direction;

terminated by 50ohm resisters(Default);

backed by infinitive ground;

only the transmit element is excited at 1V;

c = physconst('lightspeed');
fc = 24e9;
lambda = c/fc;
dx = 0.5 * lambda;
dy = 0.5 * lambda;
dz = 0.25 * lambda;
len = 0.495 * lambda;
width = cylinder2strip(lambda / 160);
Voltage_map = [1 0 0 0];
mydipole = dipole;
mydipole.Length = len;
mydipole.Width = width;
mydipole.Tilt = [90 90];
mydipole.TiltAxis = [0 1 0; 0 0 1];
myelement = reflector;
myelement.Exciter = mydipole;
myelement.GroundPlaneLength = inf;
myelement.Spacing = dz;
myarray = rectangularArray;
myarray.Element = myelement;
myarray.RowSpacing = dy;
myarray.ColumnSpacing = dx;
myarray.AmplitudeTaper = Voltage_map;
show(myarray);

(2)Voltage distribution derivation

Vo = Sparameters * Vin;

S = sparameters(myarray, fc);
Voltage = S.Parameters * Voltage_map';

(3)results

0.467586377317679 + 0.187044014975194i
0.201363968041588 - 0.122844419394166i
-0.0685242315036429 - 0.106783300795153i
-0.0190084411346258 + 0.0534820400032710i

However, the reults seems weird...and I'm not sure about the process is right or not.