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nf2ff: calculate LH- and RH circular polarization 

Signed-off-by: Thorsten Liebig <thorsten.liebig@gmx.de>
pull/1/head
Thorsten Liebig 2013-01-02 19:23:25 +01:00
parent d29eeefcda
commit 2ca306f70f
2 changed files with 44 additions and 14 deletions
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25
matlab/Tutorials/Helical_Antenna.m
View File

@ -163,9 +163,9 @@ thetaRange = unique([0:0.5:90 90:180]);
phiRange = (0:2:360) - 180; phiRange = (0:2:360) - 180;
disp( 'calculating the 3D far field...' ); disp( 'calculating the 3D far field...' );
nf2ff = CalcNF2FF(nf2ff, Sim_Path, f_res, thetaRange*pi/180, phiRange*pi/180,'Mode',1,'Outfile','3D_Pattern.h5','Verbose',1); nf2ff = CalcNF2FF(nf2ff, Sim_Path, f_res, thetaRange*pi/180, phiRange*pi/180,'Mode',0,'Outfile','3D_Pattern.h5','Verbose',1);
theta_HPBW = thetaRange(find(nf2ff.E_norm{1}(:,1)<max(nf2ff.E_norm{1}(:,1))/2,1))*2; theta_HPBW = interp1(nf2ff.E_norm{1}(:,1)/max(nf2ff.E_norm{1}(:,1)),thetaRange,1/sqrt(2))*2;
% display power and directivity % display power and directivity
disp( ['radiated power: Prad = ' num2str(nf2ff.Prad) ' Watt']); disp( ['radiated power: Prad = ' num2str(nf2ff.Prad) ' Watt']);
@ -175,6 +175,23 @@ disp( ['theta_HPBW = ' num2str(theta_HPBW) ' °']);
%% %%
E_far_normalized = nf2ff.E_norm{1} / max(nf2ff.E_norm{1}(:)) * nf2ff.Dmax; directivity = nf2ff.P_rad{1}/nf2ff.Prad*4*pi;
DumpFF2VTK([Sim_Path '/3D_Pattern.vtk'],E_far_normalized,thetaRange,phiRange,1e-3); directivity_CPRH = abs(nf2ff.E_cprh{1}).^2./max(nf2ff.E_norm{1}(:)).^2*nf2ff.Dmax;
directivity_CPLH = abs(nf2ff.E_cplh{1}).^2./max(nf2ff.E_norm{1}(:)).^2*nf2ff.Dmax;
%%
figure
plot(thetaRange, 10*log10(directivity(:,1)'),'k-','LineWidth',2);
hold on
grid on
xlabel('theta (deg)');
ylabel('directivity (dBi)');
plot(thetaRange, 10*log10(directivity_CPRH(:,1)'),'g--','LineWidth',2);
plot(thetaRange, 10*log10(directivity_CPLH(:,1)'),'r-.','LineWidth',2);
legend('norm','CPRH','CPLH');
%% dump to vtk
DumpFF2VTK([Sim_Path '/3D_Pattern.vtk'],directivity,thetaRange,phiRange,1e-3);
DumpFF2VTK([Sim_Path '/3D_Pattern_CPRH.vtk'],directivity_CPRH,thetaRange,phiRange,1e-3);
DumpFF2VTK([Sim_Path '/3D_Pattern_CPLH.vtk'],directivity_CPLH,thetaRange,phiRange,1e-3);

21
matlab/private/ReadNF2FF.m
View File

@ -34,7 +34,6 @@ if isOctave
else else
% matlab compatibility to older versions % matlab compatibility to older versions
if verLessThan('matlab','7.12') if verLessThan('matlab','7.12')
% read data % read data
for n=1:numel(nf2ff.freq) for n=1:numel(nf2ff.freq)
nf2ff.E_theta{n} = double(hdf5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_real']) + 1i*hdf5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_imag'])); nf2ff.E_theta{n} = double(hdf5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_real']) + 1i*hdf5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_imag']));
@ -42,9 +41,7 @@ else
nf2ff.E_norm{n} = double(sqrt(abs(nf2ff.E_theta{n}).^2+abs(nf2ff.E_phi{n}).^2)); nf2ff.E_norm{n} = double(sqrt(abs(nf2ff.E_theta{n}).^2+abs(nf2ff.E_phi{n}).^2));
nf2ff.P_rad{n} = double(hdf5read(file,['/nf2ff/P_rad/FD/f' int2str(n-1)])); nf2ff.P_rad{n} = double(hdf5read(file,['/nf2ff/P_rad/FD/f' int2str(n-1)]));
end end
return else
end
% read data % read data
for n=1:numel(nf2ff.freq) for n=1:numel(nf2ff.freq)
nf2ff.E_theta{n} = double(h5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_real']) + 1i*h5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_imag'])); nf2ff.E_theta{n} = double(h5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_real']) + 1i*h5read(file,['/nf2ff/E_theta/FD/f' int2str(n-1) '_imag']));
@ -53,3 +50,19 @@ else
nf2ff.P_rad{n} = double(h5read(file,['/nf2ff/P_rad/FD/f' int2str(n-1)])); nf2ff.P_rad{n} = double(h5read(file,['/nf2ff/P_rad/FD/f' int2str(n-1)]));
end end
end end
end
% Calculation of right- and left-handed circular polarization
% adopted from
% 2012, Tim Pegg <teepegg@gmail.com>
% Setup vectors for converting to LHCP and RHCP polarization senses
cosphi = cos(nf2ff.phi)';
sinphi = sin(nf2ff.phi)';
for f=1:numel(nf2ff.freq)
for n = 1:numel(nf2ff.theta)
nf2ff.E_cprh{f}(n,:) = (cosphi+1i*sinphi) .* (nf2ff.E_theta{f}(n,:)+1i*nf2ff.E_phi{f}(n,:))/sqrt(2);
nf2ff.E_cplh{f}(n,:) = (cosphi-1i*sinphi) .* (nf2ff.E_theta{f}(n,:)-1i*nf2ff.E_phi{f}(n,:))/sqrt(2);
end
end