diff --git a/Tutorials/Simple_Patch_Antenna.m b/Tutorials/Simple_Patch_Antenna.m
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+++ b/Tutorials/Simple_Patch_Antenna.m
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+%
+% EXAMPLE / antennas / patch antenna simple
+%
+% This example demonstrates how to:
+%  - calculate the reflection coefficient of a patch antenna
+% 
+%
+% Tested with
+%  - Matlab 2009b
+%  - Octave 3.3.52
+%  - openEMS v0.0.23
+%
+% (C) 2010,2011 Thorsten Liebig <thorsten.liebig@uni-due.de>
+
+close all
+clear
+clc
+
+%% setup the simulation
+physical_constants;
+unit = 1e-3; % all length in mm
+
+% patch width in x-direction
+patch.width  = 30; % resonant length
+% patch length in y-direction
+patch.length = 40;
+
+%substrate setup
+substrate.epsR   = 3.38;
+substrate.kappa  = 1e-3 * 2*pi*2.45e9 * EPS0*substrate.epsR;
+substrate.width  = 60;
+substrate.length = 60;
+substrate.thickness = 1.524;
+substrate.cells = 4;
+
+%setup feeding
+feed.pos = -6; %feeding position in x-direction
+feed.width = 2;  %feeding port width
+feed.R = 50;     %feed resistance
+
+% size of the simulation box
+SimBox = [200 200 100];
+
+%% setup FDTD parameter & excitation function
+f0 = 0e9; % center frequency
+fc = 3e9; % 20 dB corner frequency (in this case 0 Hz - 3e9 Hz)
+FDTD = InitFDTD( 30000, 1e-5 );
+FDTD = SetGaussExcite( FDTD, f0, fc );
+BC = {'MUR' 'MUR' 'MUR' 'MUR' 'MUR' 'MUR'}; % boundary conditions
+FDTD = SetBoundaryCond( FDTD, BC );
+
+%% setup CSXCAD geometry & mesh
+% currently, openEMS cannot automatically generate a mesh
+max_res = c0 / (f0+fc) / unit / 20; % cell size: lambda/20
+CSX = InitCSX();
+
+%create fixed lines for the simulation box, substrate and port
+mesh.x = [-SimBox(1)/2 SimBox(1)/2 -substrate.width/2 substrate.width/2 -patch.width/2 patch.width/2 feed.pos];
+mesh.x = SmoothMeshLines( mesh.x, max_res, 1.4); % create a smooth mesh between specified fixed mesh lines
+
+mesh.y = [-SimBox(2)/2 SimBox(2)/2 -substrate.length/2 substrate.length/2 -feed.width/2 feed.width/2 -patch.length/2 patch.length/2];
+mesh.y = SmoothMeshLines( mesh.y, max_res, 1.4 );
+
+%create fixed lines for the simulation box and given number of lines inside the substrate
+mesh.z = [-SimBox(3)/2 linspace(0,substrate.thickness,substrate.cells) SimBox(3)/2 ];
+mesh.z = SmoothMeshLines( mesh.z, max_res, 1.4 );
+
+CSX = DefineRectGrid( CSX, unit, mesh );
+
+%% create patch
+CSX = AddMetal( CSX, 'patch' ); % create a perfect electric conductor (PEC)
+start = [-patch.width/2 -patch.length/2 substrate.thickness];
+stop  = [ patch.width/2  patch.length/2 substrate.thickness];
+CSX = AddBox(CSX,'patch',10,start,stop); % add a box-primitive to the metal property 'patch'
+
+%% create substrate
+CSX = AddMaterial( CSX, 'substrate' );
+CSX = SetMaterialProperty( CSX, 'substrate', 'Epsilon', substrate.epsR, 'Kappa', substrate.kappa );
+start = [-substrate.width/2 -substrate.length/2 0];
+stop  = [ substrate.width/2  substrate.length/2 substrate.thickness];
+CSX = AddBox( CSX, 'substrate', 0, start, stop );
+
+%% create ground (same size as substrate)
+CSX = AddMetal( CSX, 'gnd' ); % create a perfect electric conductor (PEC)
+start(3)=0;
+stop(3) =0;
+CSX = AddBox(CSX,'gnd',10,start,stop);
+
+%% apply the excitation & resist as a current source
+start = [feed.pos-.1 -feed.width/2 0];
+stop  = [feed.pos+.1 +feed.width/2 substrate.thickness];
+[CSX] = AddLumpedPort(CSX, 5 ,1 ,feed.R, start, stop, [0 0 1], 'excite');
+
+%%nf2ff calc
+SimBox = SimBox - max_res * 4;  %reduced SimBox size for nf2ff box
+[CSX nf2ff] = CreateNF2FFBox(CSX, 'nf2ff', -SimBox/2, SimBox/2);
+
+%% prepare simulation folder
+Sim_Path = 'tmp';
+Sim_CSX = 'patch_ant.xml';
+
+[status, message, messageid] = rmdir( Sim_Path, 's' ); % clear previous directory
+[status, message, messageid] = mkdir( Sim_Path ); % create empty simulation folder
+
+%% write openEMS compatible xml-file
+WriteOpenEMS( [Sim_Path '/' Sim_CSX], FDTD, CSX );
+
+%% show the structure
+CSXGeomPlot( [Sim_Path '/' Sim_CSX] );
+
+%% run openEMS
+RunOpenEMS( Sim_Path, Sim_CSX );
+
+%% postprocessing & do the plots
+freq = linspace( max([1e9,f0-fc]), f0+fc, 501 );
+U = ReadUI( {'port_ut1','et'}, 'tmp/', freq ); % time domain/freq domain voltage
+I = ReadUI( 'port_it1', 'tmp/', freq ); % time domain/freq domain current (half time step is corrected)
+
+% plot feed point impedance
+figure
+Zin = U.FD{1}.val ./ I.FD{1}.val;
+plot( freq/1e6, real(Zin), 'k-', 'Linewidth', 2 );
+hold on
+grid on
+plot( freq/1e6, imag(Zin), 'r--', 'Linewidth', 2 );
+title( 'feed point impedance' );
+xlabel( 'frequency f / MHz' );
+ylabel( 'impedance Z_{in} / Ohm' );
+legend( 'real', 'imag' );
+
+% plot reflection coefficient S11
+figure
+uf_inc = 0.5*(U.FD{1}.val + I.FD{1}.val * 50);
+if_inc = 0.5*(I.FD{1}.val - U.FD{1}.val / 50);
+uf_ref = U.FD{1}.val - uf_inc;
+if_ref = if_inc - I.FD{1}.val;
+s11 = uf_ref ./ uf_inc;
+plot( freq/1e6, 20*log10(abs(s11)), 'k-', 'Linewidth', 2 );
+grid on
+title( 'reflection coefficient S_{11}' );
+xlabel( 'frequency f / MHz' );
+ylabel( 'reflection coefficient |S_{11}|' );
+
+P_in = 0.5*U.FD{1}.val .* conj( I.FD{1}.val ); % antenna feed power
+
+%% NFFF contour plots %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%find resonance frequncy from s11
+f_res_ind = find(s11==min(s11));
+f_res = freq(f_res_ind);
+
+% calculate the far field at phi=0 degrees and at phi=90 degrees
+thetaRange = (0:2:359) - 180;
+r = 1; % evaluate fields at radius r
+disp( 'calculating far field at phi=[0 90] deg...' );
+[E_far_theta,E_far_phi,Prad,Dmax] = AnalyzeNF2FF( Sim_Path, nf2ff, f_res, thetaRange, [0 90], r );
+
+Dlog=10*log10(Dmax);
+
+% display power and directivity
+disp( ['radiated power: Prad = ' num2str(Prad) ' Watt']);
+disp( ['directivity: Dmax = ' num2str(Dlog) ' dBi'] );
+disp( ['efficiency: nu_rad = ' num2str(100*Prad./real(P_in(f_res_ind))) ' %']);
+
+% calculate the e-field magnitude for phi = 0 deg
+E_phi0_far = zeros(1,numel(thetaRange));
+for n=1:numel(thetaRange)
+    E_phi0_far(n) = norm( [E_far_theta(n,1) E_far_phi(n,1)] );
+end
+
+E_phi0_far_log = 20*log10(abs(E_phi0_far)/max(abs(E_phi0_far)));
+E_phi0_far_log = E_phi0_far_log + Dlog;
+
+% display polar plot
+figure
+plot( thetaRange, E_phi0_far_log ,'k-' );
+xlabel( 'theta (deg)' );
+ylabel( 'directivity (dBi)');
+grid on;
+hold on;
+
+% calculate the e-field magnitude for phi = 90 deg
+E_phi90_far = zeros(1,numel(thetaRange));
+for n=1:numel(thetaRange)
+    E_phi90_far(n) = norm([E_far_theta(n,2) E_far_phi(n,2)]);
+end
+
+E_phi90_far_log = 20*log10(abs(E_phi90_far)/max(abs(E_phi90_far)));
+E_phi90_far_log = E_phi90_far_log + Dlog;
+
+% display polar plot
+plot( thetaRange, E_phi90_far_log ,'r-' );
+legend('phi=0','phi=90')
+
diff --git a/Tutorials/readme b/Tutorials/readme
new file mode 100644
index 0000000..a80dfa6
--- /dev/null
+++ b/Tutorials/readme
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+* Find the tutorial describtions at http://openems.de/index.php/Tutorials