Looking for coding for planar array

planar array

anyone know coding for planar array... i really need help...

planar array

have u started coding, let me know exactly what help do u need..

i did coding in matlab for rectangular planar array of 8X6 elemens...

Re: planar array

below is my coding... cant figure out why some of the graph are not shown..

function[]=ARRAYS;
close all;
clc;
option_a=0;
while((option_a~=1)&(option_a~=2)),
disp(strvcat('OUTPUT DEVICE OPTION FOR THE OUTPUT PARAMETERS',...
'OPTION (1):SCREEN','OPTION (2):OUTPUT FILE'));
option_a=input('OUTPUT DEVICE =');
end
if option_a==2, %OUTPUT FILE
filename=input('INPUT THE DESIRED OUTPUT FILENAME <in single quotes> = ',...
's');
fid=fopen(filename,'wt');
end
disc=181;
MM=disc;
NN=disc;
theta_low=0;
theta_up=180;
phi_low=0;
phi_up=360;


% CHOICE OF LINEAR OR PLANAR ARRAY

option_b=0;
while ((option_b~=2)),
disp(strvcat('PLANAR ARRAY','OPTION (2)LANAR ARRAY'));
option_b=input('OPTION NUMBER =');
end;


if option_b==2, % PLANAR ARRAY
%M=180;
%N=180;
k=2*pi;
dtheta=pi/MM;
dphi=2*pi/NN;

Mx=0;
while (Mx<2),
Mx=floor(input('NUMBER OF ELEMENTS IN THE X-DIRECTION ='));
end
Ny=0;
while (Ny<2),
Ny=floor(input('NUMBER OF ELEMENTS IN THE Y-DIRECTION ='));
end

dx=input('SPACING dx BETWEEN THE ELEMENTS (IN WAVELENGTHS) =')-1e-10;
dy=input('SPACING dy BETWEEN THE ELEMENTS (IN WAVELENGTHS) =')-1e-10;
thmax2=input('MAXIMUM BEAM DIRECTION - ANGLE THETA (IN DEGREES - INTEGER #)=');
phimax2=input('MAXIMUM BEAM DIRECTION - ANGLE PHI (IN DEGREES - INTEGER #)=');
phieval=input('THE PATTERN IS EVALUATED AT AN ANGLE PHI (IN DEGREES - INTEGER #)=');
dtor=pi/180;
betax=-k*dx*sin(dtor*thmax2)*cos(dtor*phimax2);
betay=-k*dy*sin(dtor*thmax2)*sin(dtor*phimax2);

theta=linspace(theta_low*pi/180,theta_up*pi/180,MM+1);
phi=linspace(phi_low*pi/180,phi_up*pi/180,NN+1);

[THETA,PHI]=meshgrid(theta,phi);
AF3=af10(THETA,PHI,Mx,Ny,dx,dy,betax,betay);

Prad=sum(sum(abs(AF3).^2.*sin(THETA)*dtheta*dphi));
D1=4*pi*abs(AF3).^2/Prad;
D1dB=10.*log10(D1);
Do=4*pi*max(max(abs(AF3).^2))/Prad;
DodB=10.*log10(Do);

theta=linspace(0,pi,10*MM+1);
phi=phieval*dtor;
AF=af10(theta,phi,Mx,Ny,dx,dy,betax,betay);
D=4*pi*abs(AF).^2/Prad;
DdB=10.*log10(D);
U=(abs(AF)./max(abs(AF))).^2;

phi180=phieval*dtor-pi;
AF180=af10(theta,phi180,Mx,Ny,dx,dy,betax,betay);
D180=4*pi*abs(AF180).^2/Prad;
D180dB=10.*log10(D180);
U180=(abs(AF180)./max(abs(AF180))).^2;


end
if option_a==2
diary(filename);
end

scale=0;
while ((scale~=1)&(scale~=2)),
disp(strvcat('DIMENSIONLESS OR dB SCALE IN 3D DIRECTIVITY PLOT','OPTION (1)IMENSIONLESS SCALE','OPTION (2):dB SCALE'));
scale=input('OPTION NUMBER =');
end;




% Let's go output!!!
disp(strvcat('********************************************************'));
disp(strvcat('PROGRAM OUTPUT'));
disp(strvcat('********************************************************'));
disp(strvcat('INPUT SPECIFICATION'));
disp(strvcat('--------------------------------------------------------'));


if option_b==2
disp(strvcat('UNIFORM PLANAR ARRAY'));
disp(['NUMBER OF ELEMENTS IN X-DIRECTION = ',num2str(Mx)]);
disp(['SPACING BETWEEN THE ELEMENTS IN X-DIRECTION (IN WAVELENGTHS) = ',num2str(dx)]);
disp(['NUMBER OF ELEMENTS IN Y-DIRECTION = ',num2str(Ny)]);
disp(['SPACING BETWEEN THE ELEMENTS IN Y-DIRECTION (IN WAVELENGTHS) = ',num2str(dy)]);
disp(['MAXIMUM BEAM DIRECTION - THETA (IN DEGREES) = ',num2str(thmax2)]);
disp(['MAXIMUM BEAM DIRECTION - PHI (IN DEGREES) = ',num2str(phimax2)]);
disp(['THE 2D ANTENNA PATTERN IS EVALUATED AT AN ANGLE PHI (IN DEGREES) = ',num2str(phieval)]);
disp(strvcat('OUTPUT CHARACTERISTICS OF THE ARRAY'));
disp(strvcat('--------------------------------------------------------'));
disp(['PROGRESSIVE PHASE SHIFT IN X-DIRECTION = ',num2str(betax/dtor),' degrees']);
disp(['PROGRESSIVE PHASE SHIFT IN Y-DIRECTION = ',num2str(betay/dtor),' degrees']);
disp('DIRECTIVITY BASED ONLY ON THE FIELDS ABOVE THE XY-PLANE')
disp(['DIRECTIVITY = ',num2str(DodB-10*log10(2)),' dB']);
disp(['DIRECTIVITY = ',num2str(Do/2),' dimensionless']);
if max(AF3)<2*min(AF3)
hp=0;
thmax=0;
else
[hp,thmax]=hpbw(U,10*MM);
end
No_maxima=length(thmax);
disp('DIRECTIVITY BASED ON THE FIELDS ABOVE AND BELOW THE XY-PLANE')
disp(['DIRECTIVITY = ',num2str(DodB),' dB']);
disp(['DIRECTIVITY = ',num2str(Do),' dimensionless']);
disp(['EVALUATION PLANE: NUMBER OF MAXIMA BETWEEN 0 AND 180 DEGREES = ',num2str(No_maxima)]);
for i=1:No_maxima;
disp(['HPBW FOR MAXIMUM #',num2str(i),' ',num2str(hp(i)),' degrees THMAX = ',num2str(thmax(i)),' degrees']);
end
end


disp(' *** NOTE:');
disp(' THE NORMALIZED ARRAY FACTOR (in dB) IS STORED IN');
disp(' AN OUTPUT FILE CALLED ............ ArrFac.dat');
disp(' ================================================');

diary off;

AFdB=10.*log10(U);

if option_b==2,
for i=1:MM+1
thetarec(i)=theta(i*10-9);
AFdBrec(i)=AFdB(i*10-9);
end
for i=MM+2:2*MM+1
thetarec(i)=2*pi-thetarec(2*MM+2-i);
AFdBrec(i)=AFdBrec(2*MM+2-i);
end

end

fidaf=fopen('ArrFac.dat','wt');
fprintf(fidaf,'%7.3f %9.5f\n',[thetarec.*180/pi; AFdBrec]);
fclose(fidaf);






% PLOT THE GRAPHS
% ARRAY FACTOR

clf;
plot(theta*180/pi,AFdB,'m','linewidth',2);
xlabel(['\theta',' (degrees)']),ylabel('ARRAY FACTOR(dB)')
grid on;
axis([0 180 max(min(AFdB)-1,-60) 1]);
t1=text(1,1,['HPBW = ',num2str(max(hp)),' (degrees)']);
set(t1,'units','normalized','position',[1 1.05],'horizontalalign','right');


if option_b==2
s7=title('UNIFORM PLANAR','Fontsize',15);
set(gca,'units','normalized');
set(s7,'position',[0 1],'horizontalalign','left');
end

figure;



diff=Do-min(D);
subplot(2,1,1)
plot(theta*180/pi,D,'r','linewidth',2);
xlabel(['\theta',' (degrees)']),ylabel('DIRECTIVITY(dimensionless)')
grid on;
axis([0 180 floor(min(D)-0.1*diff-.1) ceil(Do+0.1*diff+.1)]);
t2=text(1,1,['D_0 = ',num2str(Do),' (dimensionless)']);
set(t2,'units','normalized','position',[1 1.05],'horizontalalign','right');

if option_b==2
s7=title('UNIFORM PLANAR','Fontsize',15);
set(gca,'units','normalized');
set(s7,'units','normalized','position',[0 1],'horizontalalign','left');
end


diffdB=DodB-min(DdB);
subplot(2,1,2)
plot(theta*180/pi,DdB,'b','linewidth',2);

t3=text(1,1,['D_0 = ',num2str(DodB),' (dB)']);
set(t3,'units','normalized','position',[1 1.05],'horizontalalign','right');
xlabel(['\theta',' (degrees)']),ylabel('DIRECTIVITY(dB)')
grid on;
axis([0 180 max(-50,10*floor(min(DdB)/10)) 10*ceil(DodB/10)]);


if option_b==2

for i=1:Mx*Ny;
Ncoef(i)=1;

end

figure;

x=(1-Mx)*dx/2:dxMx-1)*dx/2;
y=(1-Mx)/2:1Mx-1)/2;
subplot(2,1,1)
[AX,H1,H2]=plotyy(x,Ncoef(ceil(abs+0.1)),x,betax.*y.*180./pi);
set(get(AX(1),'Ylabel'),'String','AMPLITUDE(X)','color','r');
set(get(AX(2),'Ylabel'),'String','PHASE (degrees)','color','b');
set(AX(1),'ycolor','r');
set(AX(2),'ycolor','b');
set(H1,'Linestyle','-','color','r','linewidth',2,'marker','s');
set(H2,'Linestyle',':','color','b','linewidth',2,'marker','o');
xlabel(['ARRAY LENGTH ',' (\lambda)']);
%axis([(1-Mx)*dx/2 (Mx-1)*dx/2 0 max(Ncoef)+0.1]);
grid on;
l2=legend('AMPLITUDE',2);
[hle,l3]=legend('PHASE',1); set(hle,'color',[1 1 1]);

s7=title('UNIFORM PLANAR','Fontsize',15);
set(gca,'units','normalized');
set(s7,'units','normalized','position',[0 1],'horizontalalign','left');

x1=(1-Ny)*dy/2:dyNy-1)*dy/2;
y1=(1-Ny)/2:1Ny-1)/2;
subplot(2,1,2)
[AX,H1,H2]=plotyy(x1,Ncoef(ceil(abs(y1)+0.1)),x1,betay.*y1.*180./pi);
set(get(AX(1),'Ylabel'),'String','AMPLITUDE(Y)','color','r');
set(get(AX(2),'Ylabel'),'String','PHASE (degrees)','color','b');
set(AX(1),'ycolor','r');
set(AX(2),'ycolor','b');
set(H1,'Linestyle','-','color','r','linewidth',2,'marker','s');
set(H2,'Linestyle',':','color','b','linewidth',2,'marker','o');
xlabel(['ARRAY LENGTH ',' (\lambda)']);
%axis([(1-Ny)*dy/2 (Ny-1)*dy/2 0 max(Ncoef)+0.1]);
grid on;
l2=legend('AMPLITUDE',2);
[hle,l3]=legend('PHASE',1); set(hle,'color',[1 1 1]);

end
figure;


%Spherical Plot3D
D3=4*pi*abs(AF3).^2/Prad;

D3dB=10.*log10(D3);
D3dB=D3dB-min(min(D3dB));


if scale==1
DD=D3;
end
if scale==2
DD=D3dB;
end
disc=size(DD,1);
spherical_plot(DD,THETA,PHI,disc)
if scale==1
ss=title('3D Spherical plot of Directivity (Dimensionless)','Fontsize',15);
else
ss=title('3D Spherical plot of Directivity (dB)','Fontsize',15);
end
%title('3D Spherical plot of Directivity','Fontsize',15)






%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Subroutines %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% HPBWCALC
function[hp,thmax]=hpbw(U,M)
tol=0.001;
imax=0;
j=0;
for i=1:M+1;
if abs(U(i)-1)<tol & floor((j+2)/2)==imax+1,
imax=imax+1;
thmax(imax)=(i-1)/10;
end
if i>1 & abs(U(i)-1)<tol & U(i)>U(i-1) & j~=0,
thmax(imax)=(i-1)/10;
end
if i>1,
y(1)=U(i)-0.5;
y(2)=U(i-1)-0.5;
x(1)=(i-1)/10;
x(2)=(i-2)/10;
sign=y(1)*y(2);
if sign<0,
j=j+1;
root(j)=x(2)-y(2)*(x(2)-x(1))/(y(2)-y(1));
if j>=2 & y(2)>y(1),
hp(imax)=root(j)-root(j-1);
elseif j==1 & y(2)>y(1),
hp(imax)=2.*root(j);
end
end
end
end
if thmax(imax)>root(j),
hp(imax)=2.*(180-root(j));
end


% FACT(IARG)
function[f7]=fact(iarg)
f7=1;
for j=1:iarg;
f7=j*f7;
end

% PLANAR(THETA,PHI,MX,NY,DX,DY,BETAX,BETAY)
function[f10]=af10(theta,phi,Mx,Ny,dx,dy,betax,betay)
k=2*pi;
psix=k.*dx.*sin(theta).*cos(phi)+betax;
psiy=k.*dy.*sin(theta).*sin(phi)+betay;
AFx=sinc((Mx.*psix./2)./pi)./sinc((psix./2)./pi);
AFy=sinc((Ny.*psiy./2)./pi)./sinc((psiy./2)./pi);
f10=AFx.*AFy;



% spherical plot
function spherical_plot(r,THETA,PHI,disc)
%theta = linspace(theta_low,theta_up,disc);
%phi = linspace(phi_low,phi_up,disc);

%[THETA,PHI] = meshgrid(theta,phi);

% spherical to rectangular conversion
x = abs(r).*sin(THETA).*cos(PHI);
y = abs(r).*sin(THETA).*sin(PHI);
z = abs(r).*cos(THETA);

% do the plot
figure; surf(x,y,z); view(135,20);
C = [.8 .8 .8]; colormap(C); axis off equal;

% Draw x, y, and z axes
set(line([1e-8;max(max(x))+3],[1e-8;1e-8],[1e-8;1e-8]),'Color','r');
set(line([1e-8;1e-8],[1e-8;max(max)+3],[1e-8;1e-8]),'Color','r');
set(line([1e-8;1e-8],[1e-8;1e-8],[1e-8;max(max(z))+3]),'Color','r');

% Label x, y, and z axes
text(max(max(x))+4,0,0,'x','FontSize',14,'FontName','Times','FontAngle','italic','Color','r');
text(0,max(max)+4,0,'y','FontSize',14,'FontName','Times','FontAngle','italic','Color','r');
text(0,0,max(max(z))+4,'z','FontSize',14,'FontName','Times','FontAngle','italic','Color','r');

% Fill surface using patches
patch_1 = zeros(3,disc+1); patch_2 = zeros(3,disc+1);
patch_1(1,1:disc) = x(1,; patch_2(1,1:disc) = x(disc,;
patch_1(2,1:disc) = y(1,; patch_2(2,1:disc) = y(disc,;
patch_1(3,1:disc) = z(1,; patch_2(3,1:disc) = z(disc,;
patch(patch_1(1,,patch_1(2,,patch_1(3,,C);
patch(patch_2(1,,patch_2(2,,patch_2(3,,C);




function hpol = polar_dB(theta,rho,rmin,rmax,rticks,line_style)

% Convert degrees into radians
theta = theta * pi/180;

% Font size, font style and line width parameters
font_size = 16;
font_name = 'Times';
line_width = 1.5;

if nargin < 5
error('Requires 5 or 6 input arguments.')
elseif nargin == 5
if isstr(rho)
line_style = rho;
rho = theta;
[mr,nr] = size(rho);
if mr == 1
theta = 1:nr;
else
th = (1:mr)';
theta = th,ones(1,nr));
end
else
line_style = 'auto';
end
elseif nargin == 1
line_style = 'auto';
rho = theta;
[mr,nr] = size(rho);
if mr == 1
theta = 1:nr;
else
th = (1:mr)';
theta = th,ones(1,nr));
end
end
if isstr(theta) | isstr(rho)
error('Input arguments must be numeric.');
end
if any(size(theta) ~= size(rho))
error('THETA and RHO must be the same size.');
end

% get hold state
cax = newplot;
next = lower(get(cax,'NextPlot'));
hold_state = ishold;

% get x-axis text color so grid is in same color
tc = get(cax,'xcolor');

% Hold on to current Text defaults, reset them to the
% Axes' font attributes so tick marks use them.
fAngle = get(cax, 'DefaultTextFontAngle');
fName = get(cax, 'DefaultTextFontName');
fSize = get(cax, 'DefaultTextFontSize');
fWeight = get(cax, 'DefaultTextFontWeight');
set(cax, 'DefaultTextFontAngle', get(cax, 'FontAngle'), ...
'DefaultTextFontName', font_name, ...
'DefaultTextFontSize', font_size, ...
'DefaultTextFontWeight', get(cax, 'FontWeight') )

% only do grids if hold is off
if ~hold_state

% make a radial grid
hold on;
% v returns the axis limits
% changed the following line to let the y limits become negative
hhh=plot([0 max(theta))],[min(rho)) max(rho))]);
v = [get(cax,'xlim') get(cax,'ylim')];
ticks = length(get(cax,'ytick'));
delete(hhh);

% check radial limits (rticks)

if rticks > 5 % see if we can reduce the number
if rem(rticks,2) == 0
rticks = rticks/2;
elseif rem(rticks,3) == 0
rticks = rticks/3;
end
end

% define a circle
th = 0i/50:2*pi;
xunit = cos(th);
yunit = sin(th);
% now really force points on x/y axes to lie on them exactly
inds = [1length(th)-1)/4:length(th)];
xunits(inds(2:2:4)) = zeros(2,1);
yunits(inds(1:2:5)) = zeros(3,1);

rinc = (rmax-rmin)/rticks;

% label r
% change the following line so that the unit circle is not multiplied
% by a negative number. Ditto for the text locations.
for i=(rmin+rinc):rinc:rmax
is = i - rmin;
plot(xunit*is,yunit*is,'-','color',tc,'linewidth',0.5);
text(0,is+rinc/20,[' ' num2str(i)],'verticalalignment','bottom' );
end
% plot spokes
th = (1:6)*2*pi/12;
cst = cos(th); snt = sin(th);
cs = [-cst; cst];
sn = [-snt; snt];
plot((rmax-rmin)*cs,(rmax-rmin)*sn,'-','color',tc,'linewidth',0.5);

% plot the ticks
george=(rmax-rmin)/30; % Length of the ticks
th2 = (0:36)*2*pi/72;
cst2 = cos(th2); snt2 = sin(th2);
cs2 = [(rmax-rmin-george)*cst2; (rmax-rmin)*cst2];
sn2 = [(rmax-rmin-george)*snt2; (rmax-rmin)*snt2];
plot(cs2,sn2,'-','color',tc,'linewidth',0.15); % 0.5
plot(-cs2,-sn2,'-','color',tc,'linewidth',0.15); % 0.5


% annotate spokes in degrees
% Changed the next line to make the spokes long enough
rt = 1.1*(rmax-rmin);
for i = 1:max(size(th))
text(rt*cst(i),rt*snt(i),int2str(abs(i*30-90)),'horizontalalignment','center' );
if i == max(size(th))
loc = int2str(90);
elseif i*30+90<=180
loc = int2str(i*30+90);
else
loc = int2str(180-(i*30+90-180));
end
text(-rt*cst(i),-rt*snt(i),loc,'horizontalalignment','center' );
end
% set viewto 2-D
view(0,90);

% set axis limits
% Changed the next line to scale things properly
axis((rmax-rmin)*[-1 1 -1.1 1.1]);
end

% Reset defaults.
set(cax, 'DefaultTextFontAngle', fAngle , ...
'DefaultTextFontName', font_name, ...
'DefaultTextFontSize', fSize, ...
'DefaultTextFontWeight', fWeight );

% transform data to Cartesian coordinates.
% changed the next line so negative rho are not plotted on the other side

for i = 1:length(rho)
if (rho(i) > rmin)
if theta(i)*180/pi >=0 & theta(i)*180/pi <=90
xx(i) = (rho(i)-rmin)*cos(pi/2-theta(i));
yy(i) = (rho(i)-rmin)*sin(pi/2-theta(i));
elseif theta(i)*180/pi >=90
xx(i) = (rho(i)-rmin)*cos(-theta(i)+pi/2);
yy(i) = (rho(i)-rmin)*sin(-theta(i)+pi/2);
elseif theta(i)*180/pi < 0
xx(i) = (rho(i)-rmin)*cos(abs(theta(i))+pi/2);
yy(i) = (rho(i)-rmin)*sin(abs(theta(i))+pi/2);
end
else
xx(i) = 0;
yy(i) = 0;
end
end

% plot data on top of grid
if strcmp(line_style,'auto')
q = plot(xx,yy);
else
q = plot(xx,yy,line_style);
end
if nargout > 0
hpol = q;
end
if ~hold_state
axis('equal');axis('off');
end

% reset hold state
if ~hold_state, set(cax,'NextPlot',next); end

Re: planar array

it says ;
Undefined function or method 'af10' for input arguments of type 'double'
can anyone fix?

Re: planar array

harman16 said:

have u started coding, let me know exactly what help do u need..

i did coding in matlab for rectangular planar array of 8X6 elemens...

Click to expand...

Hello Harman,

I'm currently working on 5x16 planar array! Can you help me out with your code of 8x6 elements?
I'm having problem with my matrix!
Thanks,
sam