Linear array of cross polarized yagi-uda antennas

Hello,

I am trying to generate the radiation pattern for my antenna system which consists of two cross polarized yagi-uda antennas separated by a distance of 31 inches. I have already generated the two identical cross polarized yagi-uda antennas and generated their radiation patterns but I am having trouble joining them into a linear array. I would appreciate any guidance. Below is my code:

% CROSS POLARIZED YAGI-UDA ANTENNAS

% spacing between each cross polarized yagi uda antenna is 31 inches aka

% 0.7874 m

yagiAntenna1 = yagiUda;

yagiAntenna2 = yagiUda;

% setting the exciters of the antennas ( T-Match )

yagiAntenna1.Exciter = dipoleFolded;

yagiAntenna2.Exciter = dipoleFolded;

% setting the space between the exciter

yagiAntenna1.Exciter.Spacing = .0066674;

yagiAntenna2.Exciter.Spacing = .0066674;

% setting the width of the exciters

yagiAntenna1.Exciter.Width = .003;

yagiAntenna2.Exciter.Width = .003;

% setting the lengths of the exciters

yagiAntenna1.Exciter.Length = 0.333375;

yagiAntenna2.Exciter.Length = 0.333375;

% setting the number of directors

yagiAntenna1.NumDirectors = 6;

yagiAntenna2.NumDirectors = 6;

% setting the director lengths

yagiAntenna1.DirectorLength = [.3222752, .3048, .29845, .2921, .2809748, .2809748];

yagiAntenna2.DirectorLength = [.3175, .3048, .29845, .2921, .2809748, .2809748];

% setting the spacing between directors

yagiAntenna1.DirectorSpacing = [.06985, .1397, .2079498, .2238502, .263525, .2667];

yagiAntenna2.DirectorSpacing = [.06985, .1397, .2079498, .2238502, .263525, .2667];

% setting reflector lengths

yagiAntenna1.ReflectorLength = .346075;

yagiAntenna2.ReflectorLength = .346075;

% setting reflector spacing

yagiAntenna1.ReflectorSpacing = .104775;

yagiAntenna2.ReflectorSpacing = .104775;

% setting the tilt angle and axis for the antennas

yagiAntenna1.Tilt = 45;

yagiAntenna2.Tilt = -45;

yagiAntenna1.TiltAxis = 'Z';

yagiAntenna2.TiltAxis = 'Z';

show(yagiAntenna1);

figure;

% combining the antennas into a single antenna

crossPolYagiAntenna1 = conformalArray;

crossPolYagiAntenna1.Element = [yagiAntenna1, yagiAntenna2];

% putting antenna 1 at the origin

crossPolYagiAntenna1.ElementPosition(1,:) = [0 0 0];

crossPolYagiAntenna1.ElementPosition(2,:) = [0 0 .1524];

% applying a 90 degree phase shift between the two antennas

crossPolYagiAntenna1.PhaseShift = [0 90];

show(crossPolYagiAntenna1);figure;

% combining the antennas into a single antenna

crossPolYagiAntenna2 = conformalArray;

crossPolYagiAntenna2.Element = [yagiAntenna1, yagiAntenna2];

% putting antenna 1 at the origin

crossPolYagiAntenna2.ElementPosition(1,:) = [0 0 0];

crossPolYagiAntenna2.ElementPosition(2,:) = [0 0 .1524];

% applying a 90 degree phase shift between the two antennas

crossPolYagiAntenna2.PhaseShift = [0 90];

show(crossPolYagiAntenna2);figure;

frequency = 435e6;

azimuth_range = 0:1:360;

elevation_range = -90:1:90;

% showing the antenna radiation pattern of one of the cross polarized yagi uda antennas at 435 MHz

pattern(crossPolYagiAntenna1,frequency,azimuth_range,elevation_range);figure;

% showing the antenna radiation pattern of the other cross polarized yagi uda antennas at 435 MHz

pattern(crossPolYagiAntenna2,frequency,azimuth_range,elevation_range);

Answer 1

[Adeline]

I understand that you are trying to generate the radiation pattern of an antenna system which consists of two cross polarized yagi-uda antennas separated by 31 inches. The cross polarized yagi-uda in your code has been achieved by combining two yagi-uda antennas using “conformalArray”. Since the required final antenna system would have 4 yagi-uda antennas you can combine them using “phased.HeterogeneousConformalArray” function. The example below illustrates this idea.

Elements =[{yagiAntenna1},{yagiAntenna2},{yagiAntenna1},{yagiAntenna2}];
Comb2crossYagiAntenna = phased.HeterogeneousConformalArray();
Comb2crossYagiAntenna.ElementSet = Elements;
Comb2crossYagiAntenna.ElementIndices = [1 2 3 4];
Comb2crossYagiAntenna.ElementPosition(:,1) = [0; 0; 0];
Comb2crossYagiAntenna.ElementPosition(:,2) = [0; 0; .1524];
Comb2crossYagiAntenna.ElementPosition(:,3) = [.7874; 0; 0];
Comb2crossYagiAntenna.ElementPosition(:,4) = [.7874; 0; .1524];

viewArray(Comb2crossYagiAntenna,'ShowNormals',true);

figure;pattern(Comb2crossYagiAntenna,frequency);